If the short preamble option is specified by the user on
IBSS join, mac80211 will try to set it in the driver.
Such capability is then advertised by Beacons/ProbeResp
in the capability field.
A station not matching the short_preamble capability of
another set of nodes cannot join the same cell.
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxxxx>
---
net/mac80211/ibss.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 11a6a1b..e5ba99a 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -535,6 +535,11 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
if (!(cbss->capability & WLAN_CAPABILITY_IBSS))
goto put_bss;
+ /* not using the same preamble policy */
+ if ((cbss->capability & WLAN_CAPABILITY_SHORT_PREAMBLE) !=
+ sdata->vif.bss_conf.use_short_preamble)
+ goto put_bss;
+
/* different channel */
if (sdata->u.ibss.fixed_channel &&
sdata->u.ibss.channel != cbss->channel)
@@ -724,6 +729,9 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
else
sdata->drop_unencrypted = 0;
+ if (ifibss->vif.bss_conf.use_short_preamble)
+ capability |= WLAN_CAPABILITY_SHORT_PREAMBLE;
+
__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
ifibss->channel, ifibss->basic_rates,
capability, 0, true);
@@ -754,6 +762,8 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
capability = WLAN_CAPABILITY_IBSS;
if (ifibss->privacy)
capability |= WLAN_CAPABILITY_PRIVACY;
+ if (ifibss->vif.bss_conf.use_short_preamble)
+ capability |= WLAN_CAPABILITY_SHORT_PREAMBLE;
if (ifibss->fixed_bssid)
bssid = ifibss->bssid;
if (ifibss->fixed_channel)
@@ -762,8 +772,8 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
bssid = ifibss->bssid;
cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid,
ifibss->ssid, ifibss->ssid_len,
- WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY,
- capability);
+ WLAN_CAPABILITY_IBSS | WLAN_CAPABILITY_PRIVACY |
+ WLAN_CAPABILITY_SHORT_PREAMBLE, capability);
if (cbss) {
struct ieee80211_bss *bss;
@@ -1102,6 +1112,9 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
sdata->u.ibss.ssid_len = params->ssid_len;
+ sdata->vif.bss_conf.use_short_preamble = params->use_short_preamble;
+ changed |= BSS_CHANGED_ERP_PREAMBLE;
+
mutex_unlock(&sdata->u.ibss.mtx);
mutex_lock(&sdata->local->mtx);
@@ -1156,11 +1169,14 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
if (ifibss->privacy)
capability |= WLAN_CAPABILITY_PRIVACY;
+ if (ifibss->vif.bss_conf.use_short_preamble)
+ capability |= WLAN_CAPABILITY_SHORT_PREAMBLE;
cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->channel,
ifibss->bssid, ifibss->ssid,
ifibss->ssid_len, WLAN_CAPABILITY_IBSS |
- WLAN_CAPABILITY_PRIVACY,
+ WLAN_CAPABILITY_PRIVACY |
+ WLAN_CAPABILITY_SHORT_PREAMBLE,
capability);
if (cbss) {
--
1.8.0
--
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