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-rw-r--r--net/mac80211/ieee80211_i.h7
-rw-r--r--net/mac80211/ieee80211_ioctl.c7
-rw-r--r--net/mac80211/ieee80211_sta.c16
-rw-r--r--net/mac80211/tx.c31
-rw-r--r--net/mac80211/util.c37
5 files changed, 74 insertions, 24 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index e76a58678959..b0af6e9f5319 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -127,7 +127,6 @@ struct ieee80211_txrx_data {
struct ieee80211_tx_control *control;
unsigned int unicast:1;
unsigned int ps_buffered:1;
- unsigned int short_preamble:1;
unsigned int probe_last_frag:1;
struct ieee80211_hw_mode *mode;
struct ieee80211_rate *rate;
@@ -286,6 +285,11 @@ struct ieee80211_sub_if_data {
unsigned int promisc:1;
unsigned int use_protection:1; /* CTS protect ERP frames */
+ /* use short preamble with IEEE 802.11b: this flag is set when the AP
+ * or beacon generator reports that there are no present stations that
+ * cannot support short preambles */
+ unsigned int short_preamble:1;
+
struct net_device_stats stats;
int drop_unencrypted;
int eapol; /* 0 = process EAPOL frames as normal data frames,
@@ -447,7 +451,6 @@ struct ieee80211_local {
int fragmentation_threshold;
int short_retry_limit; /* dot11ShortRetryLimit */
int long_retry_limit; /* dot11LongRetryLimit */
- int short_preamble; /* use short preamble with IEEE 802.11b */
struct crypto_blkcipher *wep_tx_tfm;
struct crypto_blkcipher *wep_rx_tfm;
diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index e7904db55325..8292431ac48f 100644
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -1061,7 +1061,10 @@ static int ieee80211_ioctl_prism2_param(struct net_device *dev,
break;
case PRISM2_PARAM_PREAMBLE:
- local->short_preamble = value;
+ if (sdata->type != IEEE80211_IF_TYPE_AP)
+ ret = -ENOENT;
+ else
+ sdata->short_preamble = value;
break;
case PRISM2_PARAM_STAT_TIME:
@@ -1184,7 +1187,7 @@ static int ieee80211_ioctl_get_prism2_param(struct net_device *dev,
break;
case PRISM2_PARAM_PREAMBLE:
- *param = local->short_preamble;
+ *param = sdata->short_preamble;
break;
case PRISM2_PARAM_STAT_TIME:
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 8e6548974a9f..0f5f8131bd71 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -318,6 +318,7 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
+ int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
if (use_protection != sdata->use_protection) {
if (net_ratelimit()) {
@@ -329,6 +330,18 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
}
sdata->use_protection = use_protection;
}
+
+ if (!preamble_mode != sdata->short_preamble) {
+ if (net_ratelimit()) {
+ printk(KERN_DEBUG "%s: switched to %s barker preamble"
+ " (BSSID=" MAC_FMT ")\n",
+ dev->name,
+ (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
+ "short" : "long",
+ MAC_ARG(ifsta->bssid));
+ }
+ sdata->short_preamble = !preamble_mode;
+ }
}
@@ -415,6 +428,7 @@ static void ieee80211_set_associated(struct net_device *dev,
ieee80211_sta_send_associnfo(dev, ifsta);
} else {
netif_carrier_off(dev);
+ sdata->short_preamble = 0;
sdata->use_protection = 0;
memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
}
@@ -2281,7 +2295,7 @@ static int ieee80211_sta_join_ibss(struct net_device *dev,
"for IBSS beacon\n", dev->name);
break;
}
- control.tx_rate = (local->short_preamble &&
+ control.tx_rate = (sdata->short_preamble &&
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rate->val2 : rate->val;
control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 532cf5127b70..36761c7139bc 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -173,7 +173,7 @@ static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
* to closest integer */
dur = ieee80211_frame_duration(local, 10, rate, erp,
- local->short_preamble);
+ tx->sdata->short_preamble);
if (next_frag_len) {
/* Frame is fragmented: duration increases with time needed to
@@ -182,7 +182,7 @@ static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
/* next fragment */
dur += ieee80211_frame_duration(local, next_frag_len,
txrate->rate, erp,
- local->short_preamble);
+ tx->sdata->short_preamble);
}
return dur;
@@ -627,12 +627,6 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
tx->u.tx.control->rate = tx->u.tx.rate;
}
tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
- if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
- tx->local->short_preamble &&
- (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
- tx->u.tx.short_preamble = 1;
- tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
- }
return TXRX_CONTINUE;
}
@@ -641,6 +635,7 @@ static ieee80211_txrx_result
ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+ u16 fc = le16_to_cpu(hdr->frame_control);
u16 dur;
struct ieee80211_tx_control *control = tx->u.tx.control;
struct ieee80211_hw_mode *mode = tx->u.tx.mode;
@@ -677,6 +672,16 @@ ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
!(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
+ /* Transmit data frames using short preambles if the driver supports
+ * short preambles at the selected rate and short preambles are
+ * available on the network at the current point in time. */
+ if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
+ (tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
+ tx->sdata->short_preamble &&
+ (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
+ tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
+ }
+
/* Setup duration field for the first fragment of the frame. Duration
* for remaining fragments will be updated when they are being sent
* to low-level driver in ieee80211_tx(). */
@@ -1750,7 +1755,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
return NULL;
}
- control->tx_rate = (local->short_preamble &&
+ control->tx_rate = (sdata->short_preamble &&
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rate->val2 : rate->val;
control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
@@ -1765,7 +1770,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
}
EXPORT_SYMBOL(ieee80211_beacon_get);
-void ieee80211_rts_get(struct ieee80211_hw *hw,
+void ieee80211_rts_get(struct ieee80211_hw *hw, int if_id,
const void *frame, size_t frame_len,
const struct ieee80211_tx_control *frame_txctl,
struct ieee80211_rts *rts)
@@ -1775,13 +1780,13 @@ void ieee80211_rts_get(struct ieee80211_hw *hw,
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
rts->frame_control = cpu_to_le16(fctl);
- rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
+ rts->duration = ieee80211_rts_duration(hw, if_id, frame_len, frame_txctl);
memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);
-void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
+void ieee80211_ctstoself_get(struct ieee80211_hw *hw, int if_id,
const void *frame, size_t frame_len,
const struct ieee80211_tx_control *frame_txctl,
struct ieee80211_cts *cts)
@@ -1791,7 +1796,7 @@ void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
cts->frame_control = cpu_to_le16(fctl);
- cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
+ cts->duration = ieee80211_ctstoself_duration(hw, if_id, frame_len, frame_txctl);
memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index c45658309472..091ac0d634a5 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -314,31 +314,46 @@ int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
}
/* Exported duration function for driver use */
-__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
+__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, int if_id,
size_t frame_len, int rate)
{
struct ieee80211_local *local = hw_to_local(hw);
+ struct net_device *bdev = dev_get_by_index(if_id);
+ struct ieee80211_sub_if_data *sdata;
u16 dur;
int erp;
+ if (unlikely(!bdev))
+ return 0;
+
+ sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
dur = ieee80211_frame_duration(local, frame_len, rate,
- erp, local->short_preamble);
+ erp, sdata->short_preamble);
+ dev_put(bdev);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);
-__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
+__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id,
size_t frame_len,
const struct ieee80211_tx_control *frame_txctl)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
- int short_preamble = local->short_preamble;
+ struct net_device *bdev = dev_get_by_index(if_id);
+ struct ieee80211_sub_if_data *sdata;
+ int short_preamble;
int erp;
u16 dur;
+ if (unlikely(!bdev))
+ return 0;
+
+ sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
+ short_preamble = sdata->short_preamble;
+
rate = frame_txctl->rts_rate;
erp = !!(rate->flags & IEEE80211_RATE_ERP);
@@ -352,20 +367,29 @@ __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
dur += ieee80211_frame_duration(local, 10, rate->rate,
erp, short_preamble);
+ dev_put(bdev);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);
-__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
+__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id,
size_t frame_len,
const struct ieee80211_tx_control *frame_txctl)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_rate *rate;
- int short_preamble = local->short_preamble;
+ struct net_device *bdev = dev_get_by_index(if_id);
+ struct ieee80211_sub_if_data *sdata;
+ int short_preamble;
int erp;
u16 dur;
+ if (unlikely(!bdev))
+ return 0;
+
+ sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
+ short_preamble = sdata->short_preamble;
+
rate = frame_txctl->rts_rate;
erp = !!(rate->flags & IEEE80211_RATE_ERP);
@@ -378,6 +402,7 @@ __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
erp, short_preamble);
}
+ dev_put(bdev);
return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-27 15:01:08 +0000