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nl80211: Add debug prints for BSS status in scan results

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Print what the kernel believes the current BSS status (authenticated
or associated) is in scan results. In addition, check whether this
matches with the state that wpa_supplicant believes the driver to be
in.

This does not change the actual behavior, but will provide information
that will help in debugging potential issues where cfg80211/mac80211
seems to get into a different state from wpa_supplicant. In addition,
this provides an easy location for a workaround that could be added to
clear cfg80211/mac80211 state for unknown BSSes.
This commit is contained in:
Jouni Malinen 2009-12-02 16:45:31 +02:00 committed by Jouni Malinen
parent d8222ae38c
commit e6b8efeba0
2 changed files with 69 additions and 0 deletions
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2
src/drivers/driver.h
View file

@ -73,6 +73,8 @@ struct hostapd_hw_modes {
#define WPA_SCAN_NOISE_INVALID BIT(1)
#define WPA_SCAN_LEVEL_INVALID BIT(2)
#define WPA_SCAN_LEVEL_DBM BIT(3)
#define WPA_SCAN_AUTHENTICATED BIT(4)
#define WPA_SCAN_ASSOCIATED BIT(5)
/**
* struct wpa_scan_res - Scan result for an BSS/IBSS

67
src/drivers/driver_nl80211.c
View file

@ -88,6 +88,7 @@ struct wpa_driver_nl80211_data {
struct nl_cb *nl_cb;
struct genl_family *nl80211;
u8 auth_bssid[ETH_ALEN];
u8 bssid[ETH_ALEN];
int associated;
u8 ssid[32];
@ -653,6 +654,7 @@ static void mlme_event_auth(struct wpa_driver_nl80211_data *drv,
return;
}
os_memcpy(drv->auth_bssid, mgmt->sa, ETH_ALEN);
os_memset(&event, 0, sizeof(event));
os_memcpy(event.auth.peer, mgmt->sa, ETH_ALEN);
event.auth.auth_type = le_to_host16(mgmt->u.auth.auth_alg);
@ -1616,6 +1618,7 @@ static int bss_info_handler(struct nl_msg *msg, void *arg)
[NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
[NL80211_BSS_STATUS] = { .type = NLA_U32 },
[NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
};
struct wpa_scan_results *res = arg;
@ -1669,6 +1672,21 @@ static int bss_info_handler(struct nl_msg *msg, void *arg)
if (ie)
os_memcpy(r + 1, ie, ie_len);
if (bss[NL80211_BSS_STATUS]) {
enum nl80211_bss_status status;
status = nla_get_u32(bss[NL80211_BSS_STATUS]);
switch (status) {
case NL80211_BSS_STATUS_AUTHENTICATED:
r->flags |= WPA_SCAN_AUTHENTICATED;
break;
case NL80211_BSS_STATUS_ASSOCIATED:
r->flags |= WPA_SCAN_ASSOCIATED;
break;
default:
break;
}
}
tmp = os_realloc(res->res,
(res->num + 1) * sizeof(struct wpa_scan_res *));
if (tmp == NULL) {
@ -1682,6 +1700,53 @@ static int bss_info_handler(struct nl_msg *msg, void *arg)
}
static void wpa_driver_nl80211_check_bss_status(
struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
{
size_t i;
for (i = 0; i < res->num; i++) {
struct wpa_scan_res *r = res->res[i];
if (r->flags & WPA_SCAN_AUTHENTICATED) {
wpa_printf(MSG_DEBUG, "nl80211: Scan results "
"indicates BSS status with " MACSTR
" as authenticated",
MAC2STR(r->bssid));
if (drv->nlmode == NL80211_IFTYPE_STATION &&
os_memcmp(r->bssid, drv->bssid, ETH_ALEN) != 0 &&
os_memcmp(r->bssid, drv->auth_bssid, ETH_ALEN) !=
0) {
wpa_printf(MSG_DEBUG, "nl80211: Unknown BSSID"
" in local state (auth=" MACSTR
" assoc=" MACSTR ")",
MAC2STR(drv->auth_bssid),
MAC2STR(drv->bssid));
}
}
if (r->flags & WPA_SCAN_ASSOCIATED) {
wpa_printf(MSG_DEBUG, "nl80211: Scan results "
"indicate BSS status with " MACSTR
" as associated",
MAC2STR(r->bssid));
if (drv->nlmode == NL80211_IFTYPE_STATION &&
!drv->associated) {
wpa_printf(MSG_DEBUG, "nl80211: Local state "
"(not associated) does not match "
"with BSS state");
} else if (drv->nlmode == NL80211_IFTYPE_STATION &&
os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
0) {
wpa_printf(MSG_DEBUG, "nl80211: Local state "
"(associated with " MACSTR ") does "
"not match with BSS state",
MAC2STR(r->bssid));
}
}
}
}
/**
* wpa_driver_nl80211_get_scan_results - Fetch the latest scan results
* @priv: Pointer to private wext data from wpa_driver_nl80211_init()
@ -1711,6 +1776,7 @@ wpa_driver_nl80211_get_scan_results(void *priv)
if (ret == 0) {
wpa_printf(MSG_DEBUG, "Received scan results (%lu BSSes)",
(unsigned long) res->num);
wpa_driver_nl80211_check_bss_status(drv, res);
return res;
}
wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
@ -2018,6 +2084,7 @@ static int wpa_driver_nl80211_authenticate(
int count = 0;
drv->associated = 0;
os_memset(drv->auth_bssid, 0, ETH_ALEN);
if (wpa_driver_nl80211_set_mode(drv, IEEE80211_MODE_INFRA) < 0)
return -1;