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WNM: Handle BTM request with Link Removal Imminent field set to 1

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Based on IEEE P802.11be/D5.0, when a station is non-AP MLD with more
than one link the combination of the Link Removal Imminent field set to
1 and the BSS Termination Included field set to 1 means than only one of
the links is removed while the other links will remains associated.
Handle this case without starting a scan to find another BSS.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Ilan Peer 2023-12-13 16:04:10 +02:00 committed by Jouni Malinen
parent 31e025c033
commit 80810929a4
2 changed files with 21 additions and 1 deletions
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1
src/common/ieee802_11_defs.h
View file

@ -1885,6 +1885,7 @@ enum wnm_action {
#define WNM_BSS_TM_REQ_DISASSOC_IMMINENT BIT(2)
#define WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED BIT(3)
#define WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT BIT(4)
#define WNM_BSS_TM_REQ_LINK_REMOVAL_IMMINENT BIT(5)
/* IEEE Std 802.11-2012 - Table 8-253 */
enum bss_trans_mgmt_status_code {

21
wpa_supplicant/wnm_sta.c
View file

@ -1437,6 +1437,7 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
#ifdef CONFIG_MBO
const u8 *vendor;
#endif /* CONFIG_MBO */
bool disassoc_imminent;
if (wpa_s->disable_mbo_oce || wpa_s->conf->disable_btm)
return;
@ -1514,7 +1515,25 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
}
if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
disassoc_imminent = wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT;
/*
* Based on IEEE P802.11be/D5.0, when a station is a non-AP MLD with
* more than one affiliated link, the Link Removal Imminent field is
* set to 1, and the BSS Termination Included field is set to 1, only
* one of the links is removed and the other links remain associated.
* Ignore the Disassociation Imminent field in such a case.
*/
if (disassoc_imminent &&
(wpa_s->valid_links & (wpa_s->valid_links - 1)) != 0 &&
(wpa_s->wnm_mode & WNM_BSS_TM_REQ_LINK_REMOVAL_IMMINENT) &&
(wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED)) {
wpa_printf(MSG_INFO,
"WNM: BTM request for a single MLO link - ignore disassociation imminent since other links remain associated");
disassoc_imminent = false;
}
if (disassoc_imminent) {
wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
"Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning &&