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WNM: Use recent scan results on BSS transition request

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If the last scans are recent (for now, less than ten seconds old), use
them instead of triggering a new scan when a BSS Transition Management
Request frame is received. As a fallback, allow a new scan to be
triggered if no matches were found.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-11-22 20:12:12 +02:00
parent e1117c1c01
commit 75d65857d5
3 changed files with 24 additions and 5 deletions
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2
wpa_supplicant/events.c
View file

@ -1314,7 +1314,7 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
return 0; return 0;
} }
if (wnm_scan_process(wpa_s) > 0) if (wnm_scan_process(wpa_s, 1) > 0)
goto scan_work_done; goto scan_work_done;
if (sme_proc_obss_scan(wpa_s) > 0) if (sme_proc_obss_scan(wpa_s) > 0)

22
wpa_supplicant/wnm_sta.c
View file

@ -576,7 +576,7 @@ static void wnm_send_bss_transition_mgmt_resp(
} }
int wnm_scan_process(struct wpa_supplicant *wpa_s) int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
{ {
struct wpa_bss *bss; struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid; struct wpa_ssid *ssid = wpa_s->current_ssid;
@ -628,8 +628,12 @@ int wnm_scan_process(struct wpa_supplicant *wpa_s)
wnm_deallocate_memory(wpa_s); wnm_deallocate_memory(wpa_s);
return 1; return 1;
/* Send reject response for all the failures */
send_bss_resp_fail: send_bss_resp_fail:
if (!reply_on_fail)
return 0;
/* Send reject response for all the failures */
if (wpa_s->wnm_reply) { if (wpa_s->wnm_reply) {
wpa_s->wnm_reply = 0; wpa_s->wnm_reply = 0;
wnm_send_bss_transition_mgmt_resp(wpa_s, wnm_send_bss_transition_mgmt_resp(wpa_s,
@ -874,6 +878,20 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
wpa_s->wnm_cand_valid_until.usec %= 1000000; wpa_s->wnm_cand_valid_until.usec %= 1000000;
os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN); os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
if (wpa_s->last_scan_res_used > 0) {
struct os_reltime now;
os_get_reltime(&now);
if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
wpa_printf(MSG_DEBUG,
"WNM: Try to use recent scan results");
if (wnm_scan_process(wpa_s, 0) > 0)
return;
wpa_printf(MSG_DEBUG,
"WNM: No match in previous scan results - try a new scan");
}
}
wnm_set_scan_freqs(wpa_s); wnm_set_scan_freqs(wpa_s);
wpa_supplicant_req_scan(wpa_s, 0, 0); wpa_supplicant_req_scan(wpa_s, 0, 0);
} else if (reply) { } else if (reply) {

5
wpa_supplicant/wnm_sta.h
View file

@ -62,11 +62,12 @@ void wnm_deallocate_memory(struct wpa_supplicant *wpa_s);
#ifdef CONFIG_WNM #ifdef CONFIG_WNM
int wnm_scan_process(struct wpa_supplicant *wpa_s); int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail);
#else /* CONFIG_WNM */ #else /* CONFIG_WNM */
static inline int wnm_scan_process(struct wpa_supplicant *wpa_s) static inline int wnm_scan_process(struct wpa_supplicant *wpa_s,
int reply_on_fail)
{ {
return 0; return 0;
} }