From 13cc8a4a1d24ff1f3b8b6de16779ef925371b18b Mon Sep 17 00:00:00 2001 From: Arik Nemtsov Date: Thu, 17 Jul 2014 17:14:26 +0300 Subject: mac80211: support HT for TDLS stations Add the HT capabilities and HT operation information elements to TDLS setup packets where appropriate. Signed-off-by: Arik Nemtsov Reviewed-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- net/mac80211/tdls.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 84 insertions(+), 4 deletions(-) (limited to 'net/mac80211/tdls.c') diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c index c59b8f460eb9..50d0e0660cc4 100644 --- a/net/mac80211/tdls.c +++ b/net/mac80211/tdls.c @@ -170,9 +170,23 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, { enum ieee80211_band band = ieee80211_get_sdata_band(sdata); struct ieee80211_local *local = sdata->local; + struct ieee80211_supported_band *sband; + struct ieee80211_sta_ht_cap ht_cap; + struct sta_info *sta = NULL; size_t offset = 0, noffset; u8 *pos; + rcu_read_lock(); + + /* we should have the peer STA if we're already responding */ + if (action_code == WLAN_TDLS_SETUP_RESPONSE) { + sta = sta_info_get(sdata, peer); + if (WARN_ON_ONCE(!sta)) { + rcu_read_unlock(); + return; + } + } + ieee80211_add_srates_ie(sdata, skb, false, band); ieee80211_add_ext_srates_ie(sdata, skb, false, band); @@ -224,6 +238,38 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, offset = noffset; } + /* + * with TDLS we can switch channels, and HT-caps are not necessarily + * the same on all bands. The specification limits the setup to a + * single HT-cap, so use the current band for now. + */ + sband = local->hw.wiphy->bands[band]; + memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); + if ((action_code == WLAN_TDLS_SETUP_REQUEST || + action_code == WLAN_TDLS_SETUP_RESPONSE) && + ht_cap.ht_supported && (!sta || sta->sta.ht_cap.ht_supported)) { + if (action_code == WLAN_TDLS_SETUP_REQUEST) { + ieee80211_apply_htcap_overrides(sdata, &ht_cap); + + /* disable SMPS in TDLS initiator */ + ht_cap.cap |= (WLAN_HT_CAP_SM_PS_DISABLED + << IEEE80211_HT_CAP_SM_PS_SHIFT); + } else { + /* disable SMPS in TDLS responder */ + sta->sta.ht_cap.cap |= + (WLAN_HT_CAP_SM_PS_DISABLED + << IEEE80211_HT_CAP_SM_PS_SHIFT); + + /* the peer caps are already intersected with our own */ + memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); + } + + pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); + ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); + } + + rcu_read_unlock(); + /* add any remaining IEs */ if (extra_ies_len) { noffset = extra_ies_len; @@ -241,14 +287,16 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, size_t extra_ies_len) { struct ieee80211_local *local = sdata->local; + struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; size_t offset = 0, noffset; - struct sta_info *sta; + struct sta_info *sta, *ap_sta; u8 *pos; rcu_read_lock(); sta = sta_info_get(sdata, peer); - if (WARN_ON_ONCE(!sta)) { + ap_sta = sta_info_get(sdata, ifmgd->bssid); + if (WARN_ON_ONCE(!sta || !ap_sta)) { rcu_read_unlock(); return; } @@ -272,6 +320,38 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, test_sta_flag(sta, WLAN_STA_WME)) ieee80211_tdls_add_wmm_param_ie(sdata, skb); + /* add any custom IEs that go before HT operation */ + if (extra_ies_len) { + static const u8 before_ht_op[] = { + WLAN_EID_RSN, + WLAN_EID_QOS_CAPA, + WLAN_EID_FAST_BSS_TRANSITION, + WLAN_EID_TIMEOUT_INTERVAL, + }; + noffset = ieee80211_ie_split(extra_ies, extra_ies_len, + before_ht_op, + ARRAY_SIZE(before_ht_op), + offset); + pos = skb_put(skb, noffset - offset); + memcpy(pos, extra_ies + offset, noffset - offset); + offset = noffset; + } + + /* if HT support is only added in TDLS, we need an HT-operation IE */ + if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { + struct ieee80211_chanctx_conf *chanctx_conf = + rcu_dereference(sdata->vif.chanctx_conf); + if (!WARN_ON(!chanctx_conf)) { + pos = skb_put(skb, 2 + + sizeof(struct ieee80211_ht_operation)); + /* send an empty HT operation IE */ + ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, + &chanctx_conf->def, 0); + } + } + + rcu_read_unlock(); + /* add any remaining IEs */ if (extra_ies_len) { noffset = extra_ies_len; @@ -280,8 +360,6 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, } ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); - - rcu_read_unlock(); } static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, @@ -441,6 +519,8 @@ ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, 50 + /* supported rates */ 7 + /* ext capab */ 26 + /* max(WMM-info, WMM-param) */ + 2 + max(sizeof(struct ieee80211_ht_cap), + sizeof(struct ieee80211_ht_operation)) + extra_ies_len + sizeof(struct ieee80211_tdls_lnkie)); if (!skb) -- cgit v1.2.3-55-g7522