[PATCH 11/16] MBO: Always accept BTM request with disassociation imminent bit set

[benjamin at sipsolutions.net]

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.

type=feature

Signed-off-by: Avraham Stern <avraham.stern at intel.com>
Signed-off-by: Benjamin Berg <benjamin.berg at intel.com>
---
 wpa_supplicant/wnm_sta.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
index 8c51b3ddb..4a3fd5eb1 100644
--- a/wpa_supplicant/wnm_sta.c
+++ b/wpa_supplicant/wnm_sta.c
@@ -1114,11 +1114,18 @@ int wnm_scan_process(struct wpa_supplicant *wpa_s, bool pre_scan_check)
 	return 1;
 
 send_bss_resp_fail:
-	/* Send reject response for all the failures */
+	if (wpa_s->wnm_reply) {
+		/* 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;
+		}
 
-	if (wpa_s->wnm_reply)
 		wnm_send_bss_transition_mgmt_resp(wpa_s, status, reason,
 						  0, NULL);
+	}
 
 	wnm_btm_reset(wpa_s);
 
-- 
2.44.0