[PATCH 24/25] MBO: Always accept BTM request with disassociation imminent bit set

[Ilan Peer]

From: Avraham Stern <avraham.stern at intel.com>

According to Multiband Operation specification (r17, section 3.5.2),
a BSS Transition Management Request with the disassociation imminent
bit set should always be accepted.

This is enforced in case the request did not include a candidate list.
However, in case a candidate list was included but none of the APs in
the candidate list was found in the scan results, the request is
rejected.

Fix that by always accepting a request with the disassociation imminent
bit set even if no roaming candidate was found.

Signed-off-by: Avraham Stern <avraham.stern at intel.com>
---
 wpa_supplicant/wnm_sta.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
index ff1dd66..eda996d 100644
--- a/wpa_supplicant/wnm_sta.c
+++ b/wpa_supplicant/wnm_sta.c
@@ -877,10 +877,18 @@ send_bss_resp_fail:
 	if (!reply_on_fail)
 		return 0;
 
-	/* Send reject response for all the failures */
+	/* Send a response for all the failures */
 
 	if (wpa_s->wnm_reply) {
 		wpa_s->wnm_reply = 0;
+		/* If disassoc imminent is set, we must not reject */
+		if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT ||
+		    wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
+			wpa_printf(MSG_DEBUG,
+				   "WNM: Accept BTM request because disassociation imminent bit is set");
+			status = WNM_BSS_TM_ACCEPT;
+		}
+
 		wnm_send_bss_transition_mgmt_resp(wpa_s,
 						  wpa_s->wnm_dialog_token,
 						  status, 0, NULL);
-- 
1.9.1