diff options
| -rw-r--r-- | include/linux/ieee80211.h | 7 | ||||
| -rw-r--r-- | net/mac80211/ieee80211.c | 9 | ||||
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 3 | ||||
| -rw-r--r-- | net/mac80211/ieee80211_sta.c | 221 | ||||
| -rw-r--r-- | net/mac80211/sta_info.c | 3 |
5 files changed, 232 insertions, 11 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 3e641590d0c8..4d5a4c9dcba7 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -472,6 +472,13 @@ enum ieee80211_back_actioncode { WLAN_ACTION_DELBA = 2, }; +/* BACK (block-ack) parties */ +enum ieee80211_back_parties { + WLAN_BACK_RECIPIENT = 0, + WLAN_BACK_INITIATOR = 1, + WLAN_BACK_TIMER = 2, +}; + /* A-MSDU 802.11n */ #define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080 diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c index 9c14e3d303c5..2011c726f2b1 100644 --- a/net/mac80211/ieee80211.c +++ b/net/mac80211/ieee80211.c @@ -292,9 +292,18 @@ static int ieee80211_stop(struct net_device *dev) struct ieee80211_sub_if_data *sdata; struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_if_init_conf conf; + struct sta_info *sta; + int i; sdata = IEEE80211_DEV_TO_SUB_IF(dev); + list_for_each_entry(sta, &local->sta_list, list) { + for (i = 0; i < STA_TID_NUM; i++) + ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, + i, WLAN_BACK_RECIPIENT, + WLAN_REASON_QSTA_LEAVE_QBSS); + } + netif_stop_queue(dev); /* diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index baf53c047127..740d69d5bbd3 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -767,6 +767,9 @@ int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie, int ieee80211_ht_addt_info_ie_to_ht_bss_info( struct ieee80211_ht_addt_info *ht_add_info_ie, struct ieee80211_ht_bss_info *bss_info); +void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *da, + u16 tid, u16 initiator, u16 reason); +void sta_rx_agg_session_timer_expired(unsigned long data); /* ieee80211_iface.c */ int ieee80211_if_add(struct net_device *dev, const char *name, struct net_device **new_dev, int type); diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c index 5b8f484c1673..d5a7683fab3a 100644 --- a/net/mac80211/ieee80211_sta.c +++ b/net/mac80211/ieee80211_sta.c @@ -64,6 +64,11 @@ #define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C #define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0 +/* next values represent the buffer size for A-MPDU frame. + * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */ +#define IEEE80211_MIN_AMPDU_BUF 0x8 +#define IEEE80211_MAX_AMPDU_BUF 0x40 + static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst, u8 *ssid, size_t ssid_len); static struct ieee80211_sta_bss * @@ -1005,7 +1010,8 @@ static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid, struct ieee80211_mgmt *mgmt; u16 capab; - skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); + skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 + + sizeof(mgmt->u.action.u.addba_resp)); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer " "for addba resp frame\n", dev->name); @@ -1047,9 +1053,14 @@ static void ieee80211_sta_process_addba_request(struct net_device *dev, size_t len) { struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + struct ieee80211_conf *conf = &hw->conf; struct sta_info *sta; - u16 capab, tid, timeout, ba_policy, buf_size, status; + struct tid_ampdu_rx *tid_agg_rx; + u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; u8 dialog_token; + int ret = -EOPNOTSUPP; + DECLARE_MAC_BUF(mac); sta = sta_info_get(local, mgmt->sa); if (!sta) @@ -1058,28 +1069,216 @@ static void ieee80211_sta_process_addba_request(struct net_device *dev, /* extract session parameters from addba request frame */ dialog_token = mgmt->u.action.u.addba_req.dialog_token; timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); + start_seq_num = + le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; - /* TODO - currently aggregation is declined (A-MPDU add BA request - * acceptance is not obligatory by 802.11n draft), but here is - * the entry point for dealing with it */ -#ifdef MAC80211_HT_DEBUG - if (net_ratelimit()) - printk(KERN_DEBUG "Add Block Ack request arrived," - " currently denying it\n"); -#endif /* MAC80211_HT_DEBUG */ - status = WLAN_STATUS_REQUEST_DECLINED; + /* sanity check for incoming parameters: + * check if configuration can support the BA policy + * and if buffer size does not exceeds max value */ + if (((ba_policy != 1) + && (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA))) + || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { + status = WLAN_STATUS_INVALID_QOS_PARAM; +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_DEBUG "Block Ack Req with bad params from " + "%s on tid %u. policy %d, buffer size %d\n", + print_mac(mac, mgmt->sa), tid, ba_policy, + buf_size); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + goto end_no_lock; + } + /* determine default buffer size */ + if (buf_size == 0) { + struct ieee80211_hw_mode *mode = conf->mode; + buf_size = IEEE80211_MIN_AMPDU_BUF; + buf_size = buf_size << mode->ht_info.ampdu_factor; + } + + tid_agg_rx = &sta->ampdu_mlme.tid_rx[tid]; + + /* examine state machine */ + spin_lock_bh(&sta->ampdu_mlme.ampdu_rx); + + if (tid_agg_rx->state != HT_AGG_STATE_IDLE) { +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_DEBUG "unexpected Block Ack Req from " + "%s on tid %u\n", + print_mac(mac, mgmt->sa), tid); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + goto end; + } + + /* prepare reordering buffer */ + tid_agg_rx->reorder_buf = + kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC); + if ((!tid_agg_rx->reorder_buf) && net_ratelimit()) { + printk(KERN_ERR "can not allocate reordering buffer " + "to tid %d\n", tid); + goto end; + } + memset(tid_agg_rx->reorder_buf, 0, + buf_size * sizeof(struct sk_buf *)); + + if (local->ops->ampdu_action) + ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START, + sta->addr, tid, start_seq_num); +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "Rx A-MPDU on tid %d result %d", tid, ret); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + + if (ret) { + kfree(tid_agg_rx->reorder_buf); + goto end; + } + + /* change state and send addba resp */ + tid_agg_rx->state = HT_AGG_STATE_OPERATIONAL; + tid_agg_rx->dialog_token = dialog_token; + tid_agg_rx->ssn = start_seq_num; + tid_agg_rx->head_seq_num = start_seq_num; + tid_agg_rx->buf_size = buf_size; + tid_agg_rx->timeout = timeout; + tid_agg_rx->stored_mpdu_num = 0; + status = WLAN_STATUS_SUCCESS; +end: + spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx); + +end_no_lock: ieee80211_send_addba_resp(sta->dev, sta->addr, tid, dialog_token, status, 1, buf_size, timeout); sta_info_put(sta); } +void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid, + u16 initiator, u16 reason_code) +{ + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_if_sta *ifsta = &sdata->u.sta; + struct sk_buff *skb; + struct ieee80211_mgmt *mgmt; + u16 params; + + skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 + + sizeof(mgmt->u.action.u.delba)); + + if (!skb) { + printk(KERN_ERR "%s: failed to allocate buffer " + "for delba frame\n", dev->name); + return; + } + + skb_reserve(skb, local->hw.extra_tx_headroom); + mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); + memset(mgmt, 0, 24); + memcpy(mgmt->da, da, ETH_ALEN); + memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); + if (sdata->type == IEEE80211_IF_TYPE_AP) + memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN); + else + memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); + mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, + IEEE80211_STYPE_ACTION); + + skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); + + mgmt->u.action.category = WLAN_CATEGORY_BACK; + mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; + params = (u16)(initiator << 11); /* bit 11 initiator */ + params |= (u16)(tid << 12); /* bit 15:12 TID number */ + + mgmt->u.action.u.delba.params = cpu_to_le16(params); + mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); + + ieee80211_sta_tx(dev, skb, 0); +} + +void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid, + u16 initiator, u16 reason) +{ + struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + struct sta_info *sta; + int ret; + + sta = sta_info_get(local, ra); + if (!sta) + return; + + /* check if TID is in operational state */ + spin_lock_bh(&sta->ampdu_mlme.ampdu_rx); + if (sta->ampdu_mlme.tid_rx[tid].state + != HT_AGG_STATE_OPERATIONAL) { + spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx); + if (net_ratelimit()) + printk(KERN_DEBUG "rx BA session requested to stop on " + "inactive tid %d\n", tid); + sta_info_put(sta); + return; + } + sta->ampdu_mlme.tid_rx[tid].state = + HT_AGG_STATE_REQ_STOP_BA_MSK | + (initiator << HT_AGG_STATE_INITIATOR_SHIFT); + spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx); + + /* stop HW Rx aggregation. ampdu_action existence + * already verified in session init so we add the BUG_ON */ + BUG_ON(!local->ops->ampdu_action); + + ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP, + ra, tid, EINVAL); + if (ret) + printk(KERN_DEBUG "HW problem - can not stop rx " + "aggergation for tid %d\n", tid); + + /* shutdown timer has not expired */ + if (initiator != WLAN_BACK_TIMER) + del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]. + session_timer); + + /* check if this is a self generated aggregation halt */ + if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) + ieee80211_send_delba(dev, ra, tid, 0, reason); + + /* free the reordering buffer */ + kfree(sta->ampdu_mlme.tid_rx[tid].reorder_buf); + + sta->ampdu_mlme.tid_rx[tid].state = HT_AGG_STATE_IDLE; + sta_info_put(sta); +} + +/* + * After receiving Block Ack Request (BAR) we activated a + * timer after each frame arrives from the originator. + * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. + */ +void sta_rx_agg_session_timer_expired(unsigned long data) +{ + /* not an elegant detour, but there is no choice as the timer passes + * only one argument, and verious sta_info are needed here, so init + * flow in sta_info_add gives the TID as data, while the timer_to_id + * array gives the sta through container_of */ + u8 *ptid = (u8 *)data; + u8 *timer_to_id = ptid - *ptid; + struct sta_info *sta = container_of(timer_to_id, struct sta_info, + timer_to_tid[0]); + + printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); + ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, (u16)*ptid, + WLAN_BACK_TIMER, + WLAN_REASON_QSTA_TIMEOUT); +} + + static void ieee80211_rx_mgmt_auth(struct net_device *dev, struct ieee80211_if_sta *ifsta, struct ieee80211_mgmt *mgmt, diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index ffe8a49d8927..60ca07804056 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -104,6 +104,7 @@ static void sta_info_release(struct kref *kref) struct sta_info *sta = container_of(kref, struct sta_info, kref); struct ieee80211_local *local = sta->local; struct sk_buff *skb; + int i; /* free sta structure; it has already been removed from * hash table etc. external structures. Make sure that all @@ -116,6 +117,8 @@ static void sta_info_release(struct kref *kref) while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { dev_kfree_skb_any(skb); } + for (i = 0; i < STA_TID_NUM; i++) + del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer); rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv); rate_control_put(sta->rate_ctrl); kfree(sta); |