mac80211: Add HT operation modes for IBSS

The HT mode is set by iw (previous patchsets).
The interface is set into the specified HT mode.
HT mode and capabilities are announced in beacons.

If we add a station that uses HT also, the fastest matching HT mode will
be used for transmission. That means if we are using HT40+ and we add a station
running on HT40-, we would transfer at HT20.

If we join an IBSS with HT40, but the secondary channel is not
available, we will fall back into HT20 as well.

Allow frame aggregation to start in IBSS mode.

Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
[siwu@hrz.tu-chemnitz.de: Updates]
* remove implicit channel_type enum assumptions
* use rate_control_rate_init() if channel type changed
* remove channel flags check
* activate HT IBSS feature support
* slightly reword commit message
* rebase on wireless-testing

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index e844e5a38408302eec6f93e8d0af528055e61b4a..96debba2c407bfeeb91d95ce1524521a07745958 100644 (file)
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -185,6 +185,8 @@ static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *d
                memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
        else if (sdata->vif.type == NL80211_IFTYPE_STATION)
                memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
+       else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+               memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 9bfe28c9ab59d87d7012c73841870d7f24204418..c45fa5df0d41e8d2e262fd1cdacd5342985c3985 100644 (file)
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -83,6 +83,8 @@ static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
                memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
        else if (sdata->vif.type == NL80211_IFTYPE_STATION)
                memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
+       else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+               memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);
@@ -419,7 +421,8 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
        if (sdata->vif.type != NL80211_IFTYPE_STATION &&
            sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
            sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
-           sdata->vif.type != NL80211_IFTYPE_AP)
+           sdata->vif.type != NL80211_IFTYPE_AP &&
+           sdata->vif.type != NL80211_IFTYPE_ADHOC)
                return -EINVAL;
 
        if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index d3eafaefb16b15f96198b7c1902c825fa729f5fe..e0a396bdf8832300939937b03f77d33e20b238d9 100644 (file)
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -282,6 +282,8 @@ void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
                memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
        else if (sdata->vif.type == NL80211_IFTYPE_STATION)
                memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
+       else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+               memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
 
        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                                          IEEE80211_STYPE_ACTION);

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index a82f6b4adb589695fd8bb665e91351c36b491993..3f830ac159e519f7fde25db5d51c4ff344f813ce 100644 (file)
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -77,6 +77,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
        struct cfg80211_bss *bss;
        u32 bss_change;
        u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
+       enum nl80211_channel_type channel_type;
 
        lockdep_assert_held(&ifibss->mtx);
 
@@ -105,8 +106,16 @@ 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));
+       channel_type = ifibss->channel_type;
+       if (channel_type > NL80211_CHAN_HT20 &&
+           !cfg80211_can_beacon_sec_chan(local->hw.wiphy, chan, channel_type))
+               channel_type = NL80211_CHAN_HT20;
+       if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
+               /* can only fail due to HT40+/- mismatch */
+               channel_type = NL80211_CHAN_HT20;
+               WARN_ON(!ieee80211_set_channel_type(local, sdata,
+                                                   NL80211_CHAN_HT20));
+       }
        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
        sband = local->hw.wiphy->bands[chan->band];
@@ -172,6 +181,19 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                memcpy(skb_put(skb, ifibss->ie_len),
                       ifibss->ie, ifibss->ie_len);
 
+       /* add HT capability and information IEs */
+       if (channel_type && sband->ht_cap.ht_supported) {
+               pos = skb_put(skb, 4 +
+                                  sizeof(struct ieee80211_ht_cap) +
+                                  sizeof(struct ieee80211_ht_info));
+               pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
+                                               sband->ht_cap.cap);
+               pos = ieee80211_ie_build_ht_info(pos,
+                                                &sband->ht_cap,
+                                                chan,
+                                                channel_type);
+       }
+
        if (local->hw.queues >= 4) {
                pos = skb_put(skb, 9);
                *pos++ = WLAN_EID_VENDOR_SPECIFIC;
@@ -195,6 +217,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
        bss_change |= BSS_CHANGED_BEACON;
        bss_change |= BSS_CHANGED_BEACON_ENABLED;
        bss_change |= BSS_CHANGED_BASIC_RATES;
+       bss_change |= BSS_CHANGED_HT;
        bss_change |= BSS_CHANGED_IBSS;
        sdata->vif.bss_conf.ibss_joined = true;
        ieee80211_bss_info_change_notify(sdata, bss_change);
@@ -268,6 +291,8 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
        u64 beacon_timestamp, rx_timestamp;
        u32 supp_rates = 0;
        enum ieee80211_band band = rx_status->band;
+       struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
+       bool rates_updated = false;
 
        if (elems->ds_params && elems->ds_params_len == 1)
                freq = ieee80211_channel_to_frequency(elems->ds_params[0],
@@ -307,7 +332,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                                                prev_rates,
                                                sta->sta.supp_rates[band]);
 #endif
-                                       rate_control_rate_init(sta);
+                                       rates_updated = true;
                                }
                        } else
                                sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
@@ -318,6 +343,39 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                if (sta && elems->wmm_info)
                        set_sta_flag(sta, WLAN_STA_WME);
 
+               if (sta && elems->ht_info_elem && elems->ht_cap_elem &&
+                   sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) {
+                       /* we both use HT */
+                       struct ieee80211_sta_ht_cap sta_ht_cap_new;
+                       enum nl80211_channel_type channel_type =
+                               ieee80211_ht_info_to_channel_type(
+                                                       elems->ht_info_elem);
+
+                       ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
+                                                         elems->ht_cap_elem,
+                                                         &sta_ht_cap_new);
+
+                       /*
+                        * fall back to HT20 if we don't use or use
+                        * the other extension channel
+                        */
+                       if ((channel_type == NL80211_CHAN_HT40MINUS ||
+                            channel_type == NL80211_CHAN_HT40PLUS) &&
+                           channel_type != sdata->u.ibss.channel_type)
+                               sta_ht_cap_new.cap &=
+                                       ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+
+                       if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new,
+                                  sizeof(sta_ht_cap_new))) {
+                               memcpy(&sta->sta.ht_cap, &sta_ht_cap_new,
+                                      sizeof(sta_ht_cap_new));
+                               rates_updated = true;
+                       }
+               }
+
+               if (sta && rates_updated)
+                       rate_control_rate_init(sta);
+
                rcu_read_unlock();
        }
 
@@ -899,10 +957,15 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
        u32 changed = 0;
 
        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) +
+                           2 + sizeof(struct ieee80211_ht_cap) +
+                           2 + sizeof(struct ieee80211_ht_info) +
                            params->ie_len);
        if (!skb)
                return -ENOMEM;
@@ -923,13 +986,15 @@ 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));
+               if (!ieee80211_set_channel_type(sdata->local, sdata,
+                                              params->channel_type))
+                       return -EINVAL;
        }
 
        if (params->ie) {

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index bdefa6ba3f4cc71b8a2a3c50564f43f0502220a4..96fe75410bbe09549929682d31a7756286869759 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -474,6 +474,7 @@ 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 */

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 24cc50b963a9b1bdca84fe17a6eee3725262afef..60198ac664a006ac81b9106c6b9ccc4613260340 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -570,7 +570,8 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
                        WIPHY_FLAG_OFFCHAN_TX |
                        WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 
-       wiphy->features = NL80211_FEATURE_SK_TX_STATUS;
+       wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
+                         NL80211_FEATURE_HT_IBSS;
 
        if (!ops->set_key)
                wiphy->flags |= WIPHY_FLAG_IBSS_RSN;

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index daf5cde65b3086270bb873af973952480a46e069..2a85fdfebde2c2044966c0c0bbf6012106fac196 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2237,7 +2237,8 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
                if (sdata->vif.type != NL80211_IFTYPE_STATION &&
                    sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
                    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
-                   sdata->vif.type != NL80211_IFTYPE_AP)
+                   sdata->vif.type != NL80211_IFTYPE_AP &&
+                   sdata->vif.type != NL80211_IFTYPE_ADHOC)
                        break;
 
                /* verify action_code is present */