Amazing-Mirror/fragattacks
1
0
Fork 0
mirror of https://github.com/vanhoefm/fragattacks.git synced 2024-11-25 08:48:31 -05:00
Code Issues Projects Releases Wiki Activity

Retry initial 20/40 MHz co-ex scan if the driver is busy

Browse Source 
This makes the initial OBSS scans in AP mode before starting 40 MHz BSS
more robust. In addition, HT20 can be used as a backup option if none of
the scans succeed.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Peng Xu 2014-04-16 18:45:53 +03:00 committed by Jouni Malinen
parent 587d60d2b7
commit 5f0bca77a8
4 changed files with 71 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/ap/hostapd.c
View File

@ -1355,6 +1355,7 @@ void hostapd_interface_deinit(struct hostapd_iface *iface)
#ifdef CONFIG_IEEE80211N
#ifdef NEED_AP_MLME
hostapd_stop_setup_timers(iface);
eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
#endif /* NEED_AP_MLME */
#endif /* CONFIG_IEEE80211N */

1
src/ap/hostapd.h
View File

@ -363,6 +363,7 @@ struct hostapd_iface {
#endif /* CONFIG_ACS */
void (*scan_cb)(struct hostapd_iface *iface);
int num_ht40_scan_tries;
};
/* hostapd.c */

69
src/ap/hw_features.c
View File

@ -602,9 +602,55 @@ static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
}
static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
{
#define HT2040_COEX_SCAN_RETRY 15
struct hostapd_iface *iface = eloop_data;
struct wpa_driver_scan_params params;
int ret;
os_memset(&params, 0, sizeof(params));
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
ieee80211n_scan_channels_2g4(iface, &params);
else
ieee80211n_scan_channels_5g(iface, &params);
ret = hostapd_driver_scan(iface->bss[0], &params);
iface->num_ht40_scan_tries++;
os_free(params.freqs);
if (ret == -EBUSY &&
iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
ret, strerror(-ret), iface->num_ht40_scan_tries);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
return;
}
if (ret == 0) {
iface->scan_cb = ieee80211n_check_scan;
return;
}
wpa_printf(MSG_DEBUG,
"Failed to request a scan in device, bringing up in HT20 mode");
iface->conf->secondary_channel = 0;
iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
hostapd_setup_interface_complete(iface, 0);
}
void hostapd_stop_setup_timers(struct hostapd_iface *iface)
{
eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
}
static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
struct wpa_driver_scan_params params;
int ret;
if (!iface->conf->secondary_channel)
return 0; /* HT40 not used */
@ -617,13 +663,26 @@ static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
ieee80211n_scan_channels_2g4(iface, &params);
else
ieee80211n_scan_channels_5g(iface, &params);
if (hostapd_driver_scan(iface->bss[0], &params) < 0) {
wpa_printf(MSG_ERROR, "Failed to request a scan of "
"neighboring BSSes");
os_free(params.freqs);
ret = hostapd_driver_scan(iface->bss[0], &params);
os_free(params.freqs);
if (ret == -EBUSY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
ret, strerror(-ret));
iface->num_ht40_scan_tries = 1;
eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
return 1;
}
if (ret < 0) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s)",
ret, strerror(-ret));
return -1;
}
os_free(params.freqs);
iface->scan_cb = ieee80211n_check_scan;
return 1;

5
src/ap/hw_features.h
View File

@ -23,6 +23,7 @@ int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq);
int hostapd_check_ht_capab(struct hostapd_iface *iface);
int hostapd_prepare_rates(struct hostapd_iface *iface,
struct hostapd_hw_modes *mode);
void hostapd_stop_setup_timers(struct hostapd_iface *iface);
#else /* NEED_AP_MLME */
static inline void
hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
@ -61,6 +62,10 @@ static inline int hostapd_prepare_rates(struct hostapd_iface *iface,
return 0;
}
static inline void hostapd_stop_setup_timers(struct hostapd_iface *iface)
{
}
#endif /* NEED_AP_MLME */
#endif /* HW_FEATURES_H */