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mac80211: handle operating mode notif in beacon/assoc response

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In beacons and association response frames an AP may include an
operating mode notification element to advertise changes in the
number of spatial streams it can receive. Handle this using the
existing function that handles the action frame, but only handle
NSS changes, not bandwidth changes which aren't allowed here.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-02-07 22:24:55 +01:00
parent 18942d3be0
commit bee7f58699
5 changed files with 38 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/mac80211/ieee80211_i.h
View File

@ -1197,6 +1197,7 @@ struct ieee802_11_elems {
u8 *pwr_constr_elem;
u8 *quiet_elem; /* first quite element */
u8 *timeout_int;
u8 *opmode_notif;
/* length of them, respectively */
u8 ssid_len;
@ -1435,7 +1436,7 @@ enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta);
void ieee80211_sta_set_rx_nss(struct sta_info *sta);
void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, u8 opmode,
enum ieee80211_band band);
enum ieee80211_band band, bool nss_only);
/* Spectrum management */
void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,

26
net/mac80211/mlme.c
View File

@ -2217,6 +2217,21 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
elems.ht_operation,
cbss->bssid, false);
/*
* If an operating mode notification IE is present, override the
* NSS calculation (that would be done in rate_control_rate_init())
* and use the # of streams from that element.
*/
if (elems.opmode_notif &&
!(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
u8 nss;
nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
nss += 1;
sta->sta.rx_nss = nss;
}
rate_control_rate_init(sta);
if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
@ -2489,6 +2504,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_channel *chan;
struct sta_info *sta;
u32 changed = 0;
bool erp_valid;
u8 erp_value = 0;
@ -2728,14 +2744,18 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
le16_to_cpu(mgmt->u.beacon.capab_info),
erp_valid, erp_value);
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, bssid);
if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
changed |= ieee80211_config_ht_tx(sdata,
sta_info_get(sdata, bssid),
changed |= ieee80211_config_ht_tx(sdata, sta,
elems.ht_operation,
bssid, true);
if (sta && elems.opmode_notif)
ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
rx_status->band, true);
mutex_unlock(&local->sta_mtx);
if (elems.country_elem && elems.pwr_constr_elem &&

3
net/mac80211/rx.c
View File

@ -2459,7 +2459,8 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
opmode, status->band);
opmode, status->band,
false);
goto handled;
}
default:

6
net/mac80211/util.c
View File

@ -787,6 +787,12 @@ u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
else
elem_parse_failed = true;
break;
case WLAN_EID_OPMODE_NOTIF:
if (elen > 0)
elems->opmode_notif = pos;
else
elem_parse_failed = true;
break;
case WLAN_EID_MESH_ID:
elems->mesh_id = pos;
elems->mesh_id_len = elen;

6
net/mac80211/vht.c
View File

@ -141,7 +141,7 @@ void ieee80211_sta_set_rx_nss(struct sta_info *sta)
void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, u8 opmode,
enum ieee80211_band band)
enum ieee80211_band band, bool nss_only)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_supported_band *sband;
@ -164,6 +164,9 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
changed |= IEEE80211_RC_NSS_CHANGED;
}
if (nss_only)
goto change;
switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
@ -185,6 +188,7 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
changed |= IEEE80211_RC_NSS_CHANGED;
}
change:
if (changed)
rate_control_rate_update(local, sband, sta, changed);
}