diff options
| author | Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> | 2011-11-30 16:56:33 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-12-06 16:05:25 -0500 |
| commit | ff3cc5f40f36db1a60a8f1051be7fbc92233419b (patch) | |
| tree | 9348704f13be3aa3985aa1dc54cb8bf7e4d9af32 | |
| parent | 54858ee5bf659f80a784303e41ee8898fd163f98 (diff) | |
mac80211: handle protection mode, RIFS and ADDBA for HT IBSS
* Follow 802.11n-2009 9.13.3.1 for protection mode and ADDBA
* Send ADDBA only to HT STAs - implement 11.5.1.1 partially
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>
| -rw-r--r-- | net/mac80211/agg-tx.c | 21 | ||||
| -rw-r--r-- | net/mac80211/ibss.c | 18 | ||||
| -rw-r--r-- | net/mac80211/util.c | 5 |
3 files changed, 44 insertions, 0 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 2c2e9519a2e..9bfe28c9ab5 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -430,6 +430,27 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, return -EINVAL; } + /* + * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a + * member of an IBSS, and has no other existing Block Ack agreement + * with the recipient STA, then the initiating STA shall transmit a + * Probe Request frame to the recipient STA and shall not transmit an + * ADDBA Request frame unless it receives a Probe Response frame + * from the recipient within dot11ADDBAFailureTimeout. + * + * The probe request mechanism for ADDBA is currently not implemented, + * but we only build up Block Ack session with HT STAs. This information + * is set when we receive a bss info from a probe response or a beacon. + */ + if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && + !sta->sta.ht_cap.ht_supported) { +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "BA request denied - IBSS STA %pM" + "does not advertise HT support\n", pubsta->addr); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + return -EINVAL; + } + spin_lock_bh(&sta->lock); /* we have tried too many times, receiver does not want A-MPDU */ diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c index 7d84af70132..a82f6b4adb5 100644 --- a/net/mac80211/ibss.c +++ b/net/mac80211/ibss.c @@ -896,6 +896,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, struct cfg80211_ibss_params *params) { struct sk_buff *skb; + u32 changed = 0; skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + 36 /* bitrates */ + @@ -951,6 +952,23 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, ieee80211_recalc_idle(sdata->local); mutex_unlock(&sdata->local->mtx); + /* + * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is + * reserved, but an HT STA shall protect HT transmissions as though + * the HT Protection field were set to non-HT mixed mode. + * + * In an IBSS, the RIFS Mode field of the HT Operation element is + * also reserved, but an HT STA shall operate as though this field + * were set to 1. + */ + + sdata->vif.bss_conf.ht_operation_mode |= + IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED + | IEEE80211_HT_PARAM_RIFS_MODE; + + changed |= BSS_CHANGED_HT; + ieee80211_bss_info_change_notify(sdata, changed); + ieee80211_queue_work(&sdata->local->hw, &sdata->work); return 0; diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 5243c2cadee..ac7ea2949de 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -1587,6 +1587,11 @@ u8 *ieee80211_ie_build_ht_info(u8 *pos, } if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY; + + /* + * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and + * RIFS Mode are reserved in IBSS mode, therefore keep them at 0 + */ ht_info->operation_mode = 0x0000; ht_info->stbc_param = 0x0000; |