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BSS coloring: BSS Color Change Announcement element generation

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This information element is similar to the CSA one. It contains a
counter and the target color. Once the counter expired, the change to
the new color happens.

Just note the current implementation is based on CCA counter attributes
that only take Beacon and Probe Response framesinto account.
(Re)Association Response frames do not currently have kernel APIs to
decrement the CCA counter since mediatek mcu firmware does not support
it yet and it will be added in future firmware release.

Tested-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
This commit is contained in:
John Crispin 2022-03-21 12:10:31 +01:00 • committed by Jouni Malinen
parent 654d2395dd
commit f7d0b740e7
5 changed files with 37 additions and 0 deletions
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18
src/ap/beacon.c
View file

@ -618,8 +618,17 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
#ifdef CONFIG_IEEE80211AX
if (hapd->iconf->ieee80211ax && !hapd->conf->disable_11ax) {
u8 *cca_pos;
pos = hostapd_eid_he_capab(hapd, pos, IEEE80211_MODE_AP);
pos = hostapd_eid_he_operation(hapd, pos);
/* BSS Color Change Announcement element */
cca_pos = hostapd_eid_cca(hapd, pos);
if (cca_pos != pos)
hapd->cca_c_off_proberesp = cca_pos - (u8 *) resp - 2;
pos = cca_pos;
pos = hostapd_eid_spatial_reuse(hapd, pos);
pos = hostapd_eid_he_mu_edca_parameter_set(hapd, pos);
pos = hostapd_eid_he_6ghz_band_cap(hapd, pos);
@ -1658,9 +1667,18 @@ int ieee802_11_build_ap_params(struct hostapd_data *hapd,
#ifdef CONFIG_IEEE80211AX
if (hapd->iconf->ieee80211ax && !hapd->conf->disable_11ax) {
u8 *cca_pos;
tailpos = hostapd_eid_he_capab(hapd, tailpos,
IEEE80211_MODE_AP);
tailpos = hostapd_eid_he_operation(hapd, tailpos);
/* BSS Color Change Announcement element */
cca_pos = hostapd_eid_cca(hapd, tailpos);
if (cca_pos != tailpos)
hapd->cca_c_off_beacon = cca_pos - tail - 2;
tailpos = cca_pos;
tailpos = hostapd_eid_spatial_reuse(hapd, tailpos);
tailpos = hostapd_eid_he_mu_edca_parameter_set(hapd, tailpos);
tailpos = hostapd_eid_he_6ghz_band_cap(hapd, tailpos);

1
src/ap/ieee802_11.c
View file

@ -5152,6 +5152,7 @@ static u16 send_assoc_resp(struct hostapd_data *hapd, struct sta_info *sta,
if (hapd->iconf->ieee80211ax && !hapd->conf->disable_11ax) {
p = hostapd_eid_he_capab(hapd, p, IEEE80211_MODE_AP);
p = hostapd_eid_he_operation(hapd, p);
p = hostapd_eid_cca(hapd, p);
p = hostapd_eid_spatial_reuse(hapd, p);
p = hostapd_eid_he_mu_edca_parameter_set(hapd, p);
p = hostapd_eid_he_6ghz_band_cap(hapd, p);

1
src/ap/ieee802_11.h
View file

@ -100,6 +100,7 @@ u16 copy_sta_he_6ghz_capab(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *he_6ghz_capab);
int hostapd_get_he_twt_responder(struct hostapd_data *hapd,
enum ieee80211_op_mode mode);
u8 * hostapd_eid_cca(struct hostapd_data *hapd, u8 *eid);
void hostapd_tx_status(struct hostapd_data *hapd, const u8 *addr,
const u8 *buf, size_t len, int ack);
void hostapd_eapol_tx_status(struct hostapd_data *hapd, const u8 *dst,

16
src/ap/ieee802_11_he.c
View file

@ -538,3 +538,19 @@ int hostapd_get_he_twt_responder(struct hostapd_data *hapd,
return !!(mac_cap[HE_MAC_CAPAB_0] & HE_MACCAP_TWT_RESPONDER) &&
hapd->iface->conf->he_op.he_twt_responder;
}
u8 * hostapd_eid_cca(struct hostapd_data *hapd, u8 *eid)
{
if (!hapd->cca_in_progress)
return eid;
/* BSS Color Change Announcement element */
*eid++ = WLAN_EID_EXTENSION;
*eid++ = 3;
*eid++ = WLAN_EID_EXT_COLOR_CHANGE_ANNOUNCEMENT;
*eid++ = hapd->cca_count; /* Color Switch Countdown */
*eid++ = hapd->cca_color; /* New BSS Color Information */
return eid;
}

1
src/common/ieee802_11_defs.h
View file

@ -479,6 +479,7 @@
#define WLAN_EID_EXT_HE_OPERATION 36
#define WLAN_EID_EXT_HE_MU_EDCA_PARAMS 38
#define WLAN_EID_EXT_SPATIAL_REUSE 39
#define WLAN_EID_EXT_COLOR_CHANGE_ANNOUNCEMENT 42
#define WLAN_EID_EXT_OCV_OCI 54
#define WLAN_EID_EXT_SHORT_SSID_LIST 58
#define WLAN_EID_EXT_HE_6GHZ_BAND_CAP 59