When an HT IBSS is configured, we add HT Capabilities and HT Operation
IE to beacons and probe responses. This is done according to
channel_type transmitted by iw/cfg80211.
Signed-off-by: Benoit Papillault <benoit.papillault@xxxxxxx>
---
net/mac80211/ibss.c | 67 ++++++++++++++++++++++++++++++++++++++-----
net/mac80211/ieee80211_i.h | 14 +++++++++
net/mac80211/util.c | 40 ++++++++++++++++++++++++++
3 files changed, 113 insertions(+), 8 deletions(-)
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index b2cc1fd..288f512 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -64,6 +64,7 @@ static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, const int beacon_int,
struct ieee80211_channel *chan,
+ enum nl80211_channel_type channel_type,
const u32 basic_rates,
const u16 capability, u64 tsf)
{
@@ -103,7 +104,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
local->oper_channel = chan;
- WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
+ WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
sband = local->hw.wiphy->bands[chan->band];
@@ -118,7 +119,10 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
*pos++ = basic | (u8) (rate / 5);
}
- /* Build IBSS probe response */
+ /*
+ * Build IBSS probe response template (this template is also used
+ * when sending beacon, see ieee80211_beacon_get_tim())
+ */
mgmt = (void *) skb_put(skb, 24 + sizeof(mgmt->u.beacon));
memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
@@ -165,6 +169,17 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
memcpy(pos, &supp_rates[8], rates);
}
+ if (sband->ht_cap.ht_supported) {
+ pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
+ ieee80211_add_ht_cap(pos, sband);
+ }
+
+ if (channel_type != NL80211_CHAN_NO_HT &&
+ sband->ht_cap.ht_supported) {
+ pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_info));
+ ieee80211_add_ht_info(pos, sband, chan, channel_type);
+ }
+
if (ifibss->ie_len)
memcpy(skb_put(skb, ifibss->ie_len),
ifibss->ie, ifibss->ie_len);
@@ -202,6 +217,8 @@ static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
u32 basic_rates;
int i, j;
u16 beacon_int = cbss->beacon_interval;
+ const u8 *ht_cap_ie, *ht_info_ie;
+ enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
if (beacon_int < 10)
beacon_int = 10;
@@ -223,9 +240,27 @@ static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
}
}
+ /* parse HT Capabilities & Information IE, if present */
+ ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
+ ht_info_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_INFORMATION);
+ if (ht_cap_ie && ht_info_ie) {
+ struct ieee80211_ht_cap *ht_cap;
+ struct ieee80211_ht_info *ht_info;
+ struct ieee80211_sta_ht_cap sta_ht_cap;
+
+ ht_cap = (struct ieee80211_ht_cap *)(ht_cap_ie + 2);
+ ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
+
+ ieee80211_ht_cap_ie_to_sta_ht_cap(sband, ht_cap, &sta_ht_cap);
+
+ channel_type = ieee80211_channel_type_from_ht_info(
+ sdata->local, ht_info, sta_ht_cap.cap);
+ }
+
__ieee80211_sta_join_ibss(sdata, cbss->bssid,
beacon_int,
cbss->channel,
+ channel_type,
basic_rates,
cbss->capability,
cbss->tsf);
@@ -529,7 +564,8 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
sdata->drop_unencrypted = 0;
__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
- ifibss->channel, 3, /* first two are basic */
+ ifibss->channel, ifibss->channel_type,
+ 3, /* first two are basic */
capability, 0);
}
@@ -906,13 +942,14 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
sdata->vif.bss_conf.beacon_int = params->beacon_interval;
sdata->u.ibss.channel = params->channel;
+ sdata->u.ibss.channel_type = params->channel_type;
sdata->u.ibss.fixed_channel = params->channel_fixed;
/* fix ourselves to that channel now already */
if (params->channel_fixed) {
sdata->local->oper_channel = params->channel;
WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
- NL80211_CHAN_NO_HT));
+ params->channel_type));
}
if (params->ie) {
@@ -922,11 +959,25 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
sdata->u.ibss.ie_len = params->ie_len;
}
+ /*
+ * Allocate IBSS probe response template (see
+ * __ieee80211_sta_join_ibss for the needed size). According to IEEE
+ * 802.11-2007 10.4.4.2, there is only 20 possibles values. We
+ * support up IEEE80211_MAX_SUPP_RATES (currently 32) : so 8 for
+ * Supported Rates and IEEE80211_MAX_SUPP_RATES-8 for Extended
+ * Supported Rates
+ */
+
skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom +
- 36 /* bitrates */ +
- 34 /* SSID */ +
- 3 /* DS params */ +
- 4 /* IBSS params */ +
+ sizeof(struct ieee80211_hdr_3addr) +
+ 12 /* struct ieee80211_mgmt.u.beacon */ +
+ 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ +
+ 2 + 8 /* max Supported Rates */ +
+ 3 /* max DS params */ +
+ 4 /* IBSS params */ +
+ 2 + IEEE80211_MAX_SUPP_RATES-8 /* max Ext Rates */ +
+ 2 + sizeof(struct ieee80211_ht_cap) +
+ 2 + sizeof(struct ieee80211_ht_info) +
params->ie_len);
if (!skb)
return -ENOMEM;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 742e12b..78c4716 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -404,6 +404,7 @@ struct ieee80211_if_ibss {
u8 ssid_len, ie_len;
u8 *ie;
struct ieee80211_channel *channel;
+ enum nl80211_channel_type channel_type;
unsigned long ibss_join_req;
/* probe response/beacon for IBSS */
@@ -1193,6 +1194,19 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
u16 transaction, u16 auth_alg,
u8 *extra, size_t extra_len, const u8 *bssid,
const u8 *key, u8 key_len, u8 key_idx);
+
+u8 *ieee80211_add_ht_cap(u8 *pos,
+ struct ieee80211_supported_band *sband);
+
+u8 *ieee80211_add_ht_info(u8 *pos,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_channel *channel,
+ enum nl80211_channel_type channel_type);
+
+enum nl80211_channel_type ieee80211_channel_type_from_ht_info(
+ struct ieee80211_local *local,
+ struct ieee80211_ht_info *hti, u16 ap_ht_cap_flags);
+
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
const u8 *ie, size_t ie_len,
enum ieee80211_band band);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 047acb8..78c43b8 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -898,6 +898,46 @@ void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
ieee80211_tx_skb(sdata, skb);
}
+u8 *ieee80211_add_ht_info(u8 *pos,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_channel *channel,
+ enum nl80211_channel_type channel_type)
+{
+ struct ieee80211_ht_info ht_info;
+
+ ht_info.control_chan =
+ ieee80211_frequency_to_channel(channel->center_freq);
+ ht_info.ht_param = 0;
+ switch (channel_type) {
+ case NL80211_CHAN_NO_HT: /* to make compiler happy */
+ case NL80211_CHAN_HT20:
+ ht_info.ht_param |= IEEE80211_HT_PARAM_CHA_SEC_NONE;
+ break;
+ case NL80211_CHAN_HT40MINUS:
+ ht_info.ht_param |= IEEE80211_HT_PARAM_CHA_SEC_BELOW;
+ break;
+ case NL80211_CHAN_HT40PLUS:
+ ht_info.ht_param |= IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
+ break;
+ }
+ if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
+ ht_info.ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
+ ht_info.operation_mode = cpu_to_le16(0);
+ ht_info.stbc_param = cpu_to_le16(0);
+ /* It seems that Basic MCS set and Supported MCS set are identical
+ * for the first 10 bytes */
+ memset(&ht_info.basic_set, 0, 16);
+ memcpy(&ht_info.basic_set, &sband->ht_cap.mcs, 10);
+
+ /* HT Information element */
+ *pos++ = WLAN_EID_HT_INFORMATION;
+ *pos++ = sizeof(struct ieee80211_ht_info);
+ memcpy(pos, &ht_info, sizeof(struct ieee80211_ht_info));
+ pos += sizeof(struct ieee80211_ht_info);
+
+ return pos;
+}
+
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
const u8 *ie, size_t ie_len,
enum ieee80211_band band)
--
1.5.6.5
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