| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <net/mac80211.h> |
| #include <net/ieee80211_radiotap.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/netdevice.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/skbuff.h> |
| #include <linux/etherdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/wireless.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/bitmap.h> |
| #include <net/net_namespace.h> |
| #include <net/cfg80211.h> |
| |
| #include "ieee80211_i.h" |
| #include "ieee80211_rate.h" |
| #include "wep.h" |
| #include "wme.h" |
| #include "aes_ccm.h" |
| #include "ieee80211_led.h" |
| #include "cfg.h" |
| #include "debugfs.h" |
| #include "debugfs_netdev.h" |
| |
| #define SUPP_MCS_SET_LEN 16 |
| |
| /* |
| * For seeing transmitted packets on monitor interfaces |
| * we have a radiotap header too. |
| */ |
| struct ieee80211_tx_status_rtap_hdr { |
| struct ieee80211_radiotap_header hdr; |
| __le16 tx_flags; |
| u8 data_retries; |
| } __attribute__ ((packed)); |
| |
| /* common interface routines */ |
| |
| static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) |
| { |
| memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ |
| return ETH_ALEN; |
| } |
| |
| /* must be called under mdev tx lock */ |
| static void ieee80211_configure_filter(struct ieee80211_local *local) |
| { |
| unsigned int changed_flags; |
| unsigned int new_flags = 0; |
| |
| if (atomic_read(&local->iff_promiscs)) |
| new_flags |= FIF_PROMISC_IN_BSS; |
| |
| if (atomic_read(&local->iff_allmultis)) |
| new_flags |= FIF_ALLMULTI; |
| |
| if (local->monitors) |
| new_flags |= FIF_BCN_PRBRESP_PROMISC; |
| |
| if (local->fif_fcsfail) |
| new_flags |= FIF_FCSFAIL; |
| |
| if (local->fif_plcpfail) |
| new_flags |= FIF_PLCPFAIL; |
| |
| if (local->fif_control) |
| new_flags |= FIF_CONTROL; |
| |
| if (local->fif_other_bss) |
| new_flags |= FIF_OTHER_BSS; |
| |
| changed_flags = local->filter_flags ^ new_flags; |
| |
| /* be a bit nasty */ |
| new_flags |= (1<<31); |
| |
| local->ops->configure_filter(local_to_hw(local), |
| changed_flags, &new_flags, |
| local->mdev->mc_count, |
| local->mdev->mc_list); |
| |
| WARN_ON(new_flags & (1<<31)); |
| |
| local->filter_flags = new_flags & ~(1<<31); |
| } |
| |
| /* master interface */ |
| |
| static int ieee80211_master_open(struct net_device *dev) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_sub_if_data *sdata; |
| int res = -EOPNOTSUPP; |
| |
| /* we hold the RTNL here so can safely walk the list */ |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (sdata->dev != dev && netif_running(sdata->dev)) { |
| res = 0; |
| break; |
| } |
| } |
| return res; |
| } |
| |
| static int ieee80211_master_stop(struct net_device *dev) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_sub_if_data *sdata; |
| |
| /* we hold the RTNL here so can safely walk the list */ |
| list_for_each_entry(sdata, &local->interfaces, list) |
| if (sdata->dev != dev && netif_running(sdata->dev)) |
| dev_close(sdata->dev); |
| |
| return 0; |
| } |
| |
| static void ieee80211_master_set_multicast_list(struct net_device *dev) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| |
| ieee80211_configure_filter(local); |
| } |
| |
| /* regular interfaces */ |
| |
| static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) |
| { |
| /* FIX: what would be proper limits for MTU? |
| * This interface uses 802.3 frames. */ |
| if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) { |
| printk(KERN_WARNING "%s: invalid MTU %d\n", |
| dev->name, new_mtu); |
| return -EINVAL; |
| } |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| dev->mtu = new_mtu; |
| return 0; |
| } |
| |
| static inline int identical_mac_addr_allowed(int type1, int type2) |
| { |
| return (type1 == IEEE80211_IF_TYPE_MNTR || |
| type2 == IEEE80211_IF_TYPE_MNTR || |
| (type1 == IEEE80211_IF_TYPE_AP && |
| type2 == IEEE80211_IF_TYPE_WDS) || |
| (type1 == IEEE80211_IF_TYPE_WDS && |
| (type2 == IEEE80211_IF_TYPE_WDS || |
| type2 == IEEE80211_IF_TYPE_AP)) || |
| (type1 == IEEE80211_IF_TYPE_AP && |
| type2 == IEEE80211_IF_TYPE_VLAN) || |
| (type1 == IEEE80211_IF_TYPE_VLAN && |
| (type2 == IEEE80211_IF_TYPE_AP || |
| type2 == IEEE80211_IF_TYPE_VLAN))); |
| } |
| |
| static int ieee80211_open(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata, *nsdata; |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_if_init_conf conf; |
| int res; |
| bool need_hw_reconfig = 0; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| |
| /* we hold the RTNL here so can safely walk the list */ |
| list_for_each_entry(nsdata, &local->interfaces, list) { |
| struct net_device *ndev = nsdata->dev; |
| |
| if (ndev != dev && ndev != local->mdev && netif_running(ndev) && |
| compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) { |
| /* |
| * check whether it may have the same address |
| */ |
| if (!identical_mac_addr_allowed(sdata->vif.type, |
| nsdata->vif.type)) |
| return -ENOTUNIQ; |
| |
| /* |
| * can only add VLANs to enabled APs |
| */ |
| if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN && |
| nsdata->vif.type == IEEE80211_IF_TYPE_AP && |
| netif_running(nsdata->dev)) |
| sdata->u.vlan.ap = nsdata; |
| } |
| } |
| |
| switch (sdata->vif.type) { |
| case IEEE80211_IF_TYPE_WDS: |
| if (is_zero_ether_addr(sdata->u.wds.remote_addr)) |
| return -ENOLINK; |
| break; |
| case IEEE80211_IF_TYPE_VLAN: |
| if (!sdata->u.vlan.ap) |
| return -ENOLINK; |
| break; |
| case IEEE80211_IF_TYPE_AP: |
| case IEEE80211_IF_TYPE_STA: |
| case IEEE80211_IF_TYPE_MNTR: |
| case IEEE80211_IF_TYPE_IBSS: |
| /* no special treatment */ |
| break; |
| case IEEE80211_IF_TYPE_INVALID: |
| /* cannot happen */ |
| WARN_ON(1); |
| break; |
| } |
| |
| if (local->open_count == 0) { |
| res = 0; |
| if (local->ops->start) |
| res = local->ops->start(local_to_hw(local)); |
| if (res) |
| return res; |
| need_hw_reconfig = 1; |
| ieee80211_led_radio(local, local->hw.conf.radio_enabled); |
| } |
| |
| switch (sdata->vif.type) { |
| case IEEE80211_IF_TYPE_VLAN: |
| list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans); |
| /* no need to tell driver */ |
| break; |
| case IEEE80211_IF_TYPE_MNTR: |
| if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { |
| local->cooked_mntrs++; |
| break; |
| } |
| |
| /* must be before the call to ieee80211_configure_filter */ |
| local->monitors++; |
| if (local->monitors == 1) |
| local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP; |
| |
| if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) |
| local->fif_fcsfail++; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) |
| local->fif_plcpfail++; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) |
| local->fif_control++; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) |
| local->fif_other_bss++; |
| |
| netif_tx_lock_bh(local->mdev); |
| ieee80211_configure_filter(local); |
| netif_tx_unlock_bh(local->mdev); |
| break; |
| case IEEE80211_IF_TYPE_STA: |
| case IEEE80211_IF_TYPE_IBSS: |
| sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET; |
| /* fall through */ |
| default: |
| conf.vif = &sdata->vif; |
| conf.type = sdata->vif.type; |
| conf.mac_addr = dev->dev_addr; |
| res = local->ops->add_interface(local_to_hw(local), &conf); |
| if (res && !local->open_count && local->ops->stop) |
| local->ops->stop(local_to_hw(local)); |
| if (res) |
| return res; |
| |
| ieee80211_if_config(dev); |
| ieee80211_reset_erp_info(dev); |
| ieee80211_enable_keys(sdata); |
| |
| if (sdata->vif.type == IEEE80211_IF_TYPE_STA && |
| !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME)) |
| netif_carrier_off(dev); |
| else |
| netif_carrier_on(dev); |
| } |
| |
| if (local->open_count == 0) { |
| res = dev_open(local->mdev); |
| WARN_ON(res); |
| tasklet_enable(&local->tx_pending_tasklet); |
| tasklet_enable(&local->tasklet); |
| } |
| |
| /* |
| * set_multicast_list will be invoked by the networking core |
| * which will check whether any increments here were done in |
| * error and sync them down to the hardware as filter flags. |
| */ |
| if (sdata->flags & IEEE80211_SDATA_ALLMULTI) |
| atomic_inc(&local->iff_allmultis); |
| |
| if (sdata->flags & IEEE80211_SDATA_PROMISC) |
| atomic_inc(&local->iff_promiscs); |
| |
| local->open_count++; |
| if (need_hw_reconfig) |
| ieee80211_hw_config(local); |
| |
| netif_start_queue(dev); |
| |
| return 0; |
| } |
| |
| 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) { |
| if (sta->dev == dev) |
| 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); |
| |
| /* |
| * Don't count this interface for promisc/allmulti while it |
| * is down. dev_mc_unsync() will invoke set_multicast_list |
| * on the master interface which will sync these down to the |
| * hardware as filter flags. |
| */ |
| if (sdata->flags & IEEE80211_SDATA_ALLMULTI) |
| atomic_dec(&local->iff_allmultis); |
| |
| if (sdata->flags & IEEE80211_SDATA_PROMISC) |
| atomic_dec(&local->iff_promiscs); |
| |
| dev_mc_unsync(local->mdev, dev); |
| |
| /* APs need special treatment */ |
| if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
| struct ieee80211_sub_if_data *vlan, *tmp; |
| struct beacon_data *old_beacon = sdata->u.ap.beacon; |
| |
| /* remove beacon */ |
| rcu_assign_pointer(sdata->u.ap.beacon, NULL); |
| synchronize_rcu(); |
| kfree(old_beacon); |
| |
| /* down all dependent devices, that is VLANs */ |
| list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans, |
| u.vlan.list) |
| dev_close(vlan->dev); |
| WARN_ON(!list_empty(&sdata->u.ap.vlans)); |
| } |
| |
| local->open_count--; |
| |
| switch (sdata->vif.type) { |
| case IEEE80211_IF_TYPE_VLAN: |
| list_del(&sdata->u.vlan.list); |
| sdata->u.vlan.ap = NULL; |
| /* no need to tell driver */ |
| break; |
| case IEEE80211_IF_TYPE_MNTR: |
| if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) { |
| local->cooked_mntrs--; |
| break; |
| } |
| |
| local->monitors--; |
| if (local->monitors == 0) |
| local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP; |
| |
| if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL) |
| local->fif_fcsfail--; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL) |
| local->fif_plcpfail--; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) |
| local->fif_control--; |
| if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS) |
| local->fif_other_bss--; |
| |
| netif_tx_lock_bh(local->mdev); |
| ieee80211_configure_filter(local); |
| netif_tx_unlock_bh(local->mdev); |
| break; |
| case IEEE80211_IF_TYPE_STA: |
| case IEEE80211_IF_TYPE_IBSS: |
| sdata->u.sta.state = IEEE80211_DISABLED; |
| del_timer_sync(&sdata->u.sta.timer); |
| /* |
| * When we get here, the interface is marked down. |
| * Call synchronize_rcu() to wait for the RX path |
| * should it be using the interface and enqueuing |
| * frames at this very time on another CPU. |
| */ |
| synchronize_rcu(); |
| skb_queue_purge(&sdata->u.sta.skb_queue); |
| |
| if (local->scan_dev == sdata->dev) { |
| if (!local->ops->hw_scan) { |
| local->sta_sw_scanning = 0; |
| cancel_delayed_work(&local->scan_work); |
| } else |
| local->sta_hw_scanning = 0; |
| } |
| |
| flush_workqueue(local->hw.workqueue); |
| |
| sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED; |
| kfree(sdata->u.sta.extra_ie); |
| sdata->u.sta.extra_ie = NULL; |
| sdata->u.sta.extra_ie_len = 0; |
| /* fall through */ |
| default: |
| conf.vif = &sdata->vif; |
| conf.type = sdata->vif.type; |
| conf.mac_addr = dev->dev_addr; |
| /* disable all keys for as long as this netdev is down */ |
| ieee80211_disable_keys(sdata); |
| local->ops->remove_interface(local_to_hw(local), &conf); |
| } |
| |
| if (local->open_count == 0) { |
| if (netif_running(local->mdev)) |
| dev_close(local->mdev); |
| |
| if (local->ops->stop) |
| local->ops->stop(local_to_hw(local)); |
| |
| ieee80211_led_radio(local, 0); |
| |
| tasklet_disable(&local->tx_pending_tasklet); |
| tasklet_disable(&local->tasklet); |
| } |
| |
| return 0; |
| } |
| |
| int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct sta_info *sta; |
| struct ieee80211_sub_if_data *sdata; |
| u16 start_seq_num = 0; |
| u8 *state; |
| int ret; |
| DECLARE_MAC_BUF(mac); |
| |
| if (tid >= STA_TID_NUM) |
| return -EINVAL; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Open BA session requested for %s tid %u\n", |
| print_mac(mac, ra), tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| sta = sta_info_get(local, ra); |
| if (!sta) { |
| printk(KERN_DEBUG "Could not find the station\n"); |
| return -ENOENT; |
| } |
| |
| spin_lock_bh(&sta->ampdu_mlme.ampdu_tx); |
| |
| /* we have tried too many times, receiver does not want A-MPDU */ |
| if (sta->ampdu_mlme.tid_tx[tid].addba_req_num > HT_AGG_MAX_RETRIES) { |
| ret = -EBUSY; |
| goto start_ba_exit; |
| } |
| |
| state = &sta->ampdu_mlme.tid_tx[tid].state; |
| /* check if the TID is not in aggregation flow already */ |
| if (*state != HT_AGG_STATE_IDLE) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "BA request denied - session is not " |
| "idle on tid %u\n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| ret = -EAGAIN; |
| goto start_ba_exit; |
| } |
| |
| /* ensure that TX flow won't interrupt us |
| * until the end of the call to requeue function */ |
| spin_lock_bh(&local->mdev->queue_lock); |
| |
| /* create a new queue for this aggregation */ |
| ret = ieee80211_ht_agg_queue_add(local, sta, tid); |
| |
| /* case no queue is available to aggregation |
| * don't switch to aggregation */ |
| if (ret) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "BA request denied - no queue available for" |
| " tid %d\n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| spin_unlock_bh(&local->mdev->queue_lock); |
| goto start_ba_exit; |
| } |
| sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
| |
| /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
| * call back right away, it must see that the flow has begun */ |
| *state |= HT_ADDBA_REQUESTED_MSK; |
| |
| if (local->ops->ampdu_action) |
| ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START, |
| ra, tid, &start_seq_num); |
| |
| if (ret) { |
| /* No need to requeue the packets in the agg queue, since we |
| * held the tx lock: no packet could be enqueued to the newly |
| * allocated queue */ |
| ieee80211_ht_agg_queue_remove(local, sta, tid, 0); |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "BA request denied - HW or queue unavailable" |
| " for tid %d\n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| spin_unlock_bh(&local->mdev->queue_lock); |
| *state = HT_AGG_STATE_IDLE; |
| goto start_ba_exit; |
| } |
| |
| /* Will put all the packets in the new SW queue */ |
| ieee80211_requeue(local, ieee802_1d_to_ac[tid]); |
| spin_unlock_bh(&local->mdev->queue_lock); |
| |
| /* We have most probably almost emptied the legacy queue */ |
| /* ieee80211_wake_queue(local_to_hw(local), ieee802_1d_to_ac[tid]); */ |
| |
| /* send an addBA request */ |
| sta->ampdu_mlme.dialog_token_allocator++; |
| sta->ampdu_mlme.tid_tx[tid].dialog_token = |
| sta->ampdu_mlme.dialog_token_allocator; |
| sta->ampdu_mlme.tid_tx[tid].ssn = start_seq_num; |
| |
| ieee80211_send_addba_request(sta->dev, ra, tid, |
| sta->ampdu_mlme.tid_tx[tid].dialog_token, |
| sta->ampdu_mlme.tid_tx[tid].ssn, |
| 0x40, 5000); |
| |
| /* activate the timer for the recipient's addBA response */ |
| sta->ampdu_mlme.tid_tx[tid].addba_resp_timer.expires = |
| jiffies + ADDBA_RESP_INTERVAL; |
| add_timer(&sta->ampdu_mlme.tid_tx[tid].addba_resp_timer); |
| printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); |
| |
| start_ba_exit: |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| sta_info_put(sta); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| |
| int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw, |
| u8 *ra, u16 tid, |
| enum ieee80211_back_parties initiator) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct sta_info *sta; |
| u8 *state; |
| int ret = 0; |
| DECLARE_MAC_BUF(mac); |
| |
| if (tid >= STA_TID_NUM) |
| return -EINVAL; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Stop a BA session requested for %s tid %u\n", |
| print_mac(mac, ra), tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| sta = sta_info_get(local, ra); |
| if (!sta) |
| return -ENOENT; |
| |
| /* check if the TID is in aggregation */ |
| state = &sta->ampdu_mlme.tid_tx[tid].state; |
| spin_lock_bh(&sta->ampdu_mlme.ampdu_tx); |
| |
| if (*state != HT_AGG_STATE_OPERATIONAL) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Try to stop Tx aggregation on" |
| " non active TID\n"); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| ret = -ENOENT; |
| goto stop_BA_exit; |
| } |
| |
| ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]); |
| |
| *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
| (initiator << HT_AGG_STATE_INITIATOR_SHIFT); |
| |
| if (local->ops->ampdu_action) |
| ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP, |
| ra, tid, NULL); |
| |
| /* case HW denied going back to legacy */ |
| if (ret) { |
| WARN_ON(ret != -EBUSY); |
| *state = HT_AGG_STATE_OPERATIONAL; |
| ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); |
| goto stop_BA_exit; |
| } |
| |
| stop_BA_exit: |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| sta_info_put(sta); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| |
| void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct sta_info *sta; |
| u8 *state; |
| DECLARE_MAC_BUF(mac); |
| |
| if (tid >= STA_TID_NUM) { |
| printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| tid, STA_TID_NUM); |
| return; |
| } |
| |
| sta = sta_info_get(local, ra); |
| if (!sta) { |
| printk(KERN_DEBUG "Could not find station: %s\n", |
| print_mac(mac, ra)); |
| return; |
| } |
| |
| state = &sta->ampdu_mlme.tid_tx[tid].state; |
| spin_lock_bh(&sta->ampdu_mlme.ampdu_tx); |
| |
| if (!(*state & HT_ADDBA_REQUESTED_MSK)) { |
| printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", |
| *state); |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| sta_info_put(sta); |
| return; |
| } |
| |
| WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK); |
| |
| *state |= HT_ADDBA_DRV_READY_MSK; |
| |
| if (*state == HT_AGG_STATE_OPERATIONAL) { |
| printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); |
| ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]); |
| } |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| sta_info_put(sta); |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); |
| |
| void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct sta_info *sta; |
| u8 *state; |
| int agg_queue; |
| DECLARE_MAC_BUF(mac); |
| |
| if (tid >= STA_TID_NUM) { |
| printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| tid, STA_TID_NUM); |
| return; |
| } |
| |
| printk(KERN_DEBUG "Stop a BA session requested on DA %s tid %d\n", |
| print_mac(mac, ra), tid); |
| |
| sta = sta_info_get(local, ra); |
| if (!sta) { |
| printk(KERN_DEBUG "Could not find station: %s\n", |
| print_mac(mac, ra)); |
| return; |
| } |
| state = &sta->ampdu_mlme.tid_tx[tid].state; |
| |
| spin_lock_bh(&sta->ampdu_mlme.ampdu_tx); |
| if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { |
| printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); |
| sta_info_put(sta); |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| return; |
| } |
| |
| if (*state & HT_AGG_STATE_INITIATOR_MSK) |
| ieee80211_send_delba(sta->dev, ra, tid, |
| WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| |
| agg_queue = sta->tid_to_tx_q[tid]; |
| |
| /* avoid ordering issues: we are the only one that can modify |
| * the content of the qdiscs */ |
| spin_lock_bh(&local->mdev->queue_lock); |
| /* remove the queue for this aggregation */ |
| ieee80211_ht_agg_queue_remove(local, sta, tid, 1); |
| spin_unlock_bh(&local->mdev->queue_lock); |
| |
| /* we just requeued the all the frames that were in the removed |
| * queue, and since we might miss a softirq we do netif_schedule. |
| * ieee80211_wake_queue is not used here as this queue is not |
| * necessarily stopped */ |
| netif_schedule(local->mdev); |
| *state = HT_AGG_STATE_IDLE; |
| sta->ampdu_mlme.tid_tx[tid].addba_req_num = 0; |
| spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); |
| |
| sta_info_put(sta); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); |
| |
| void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_ra_tid *ra_tid; |
| struct sk_buff *skb = dev_alloc_skb(0); |
| |
| if (unlikely(!skb)) { |
| if (net_ratelimit()) |
| printk(KERN_WARNING "%s: Not enough memory, " |
| "dropping start BA session", skb->dev->name); |
| return; |
| } |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| |
| skb->pkt_type = IEEE80211_ADDBA_MSG; |
| skb_queue_tail(&local->skb_queue, skb); |
| tasklet_schedule(&local->tasklet); |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| |
| void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_ra_tid *ra_tid; |
| struct sk_buff *skb = dev_alloc_skb(0); |
| |
| if (unlikely(!skb)) { |
| if (net_ratelimit()) |
| printk(KERN_WARNING "%s: Not enough memory, " |
| "dropping stop BA session", skb->dev->name); |
| return; |
| } |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| |
| skb->pkt_type = IEEE80211_DELBA_MSG; |
| skb_queue_tail(&local->skb_queue, skb); |
| tasklet_schedule(&local->tasklet); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| |
| static void ieee80211_set_multicast_list(struct net_device *dev) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| int allmulti, promisc, sdata_allmulti, sdata_promisc; |
| |
| allmulti = !!(dev->flags & IFF_ALLMULTI); |
| promisc = !!(dev->flags & IFF_PROMISC); |
| sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI); |
| sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC); |
| |
| if (allmulti != sdata_allmulti) { |
| if (dev->flags & IFF_ALLMULTI) |
| atomic_inc(&local->iff_allmultis); |
| else |
| atomic_dec(&local->iff_allmultis); |
| sdata->flags ^= IEEE80211_SDATA_ALLMULTI; |
| } |
| |
| if (promisc != sdata_promisc) { |
| if (dev->flags & IFF_PROMISC) |
| atomic_inc(&local->iff_promiscs); |
| else |
| atomic_dec(&local->iff_promiscs); |
| sdata->flags ^= IEEE80211_SDATA_PROMISC; |
| } |
| |
| dev_mc_sync(local->mdev, dev); |
| } |
| |
| static const struct header_ops ieee80211_header_ops = { |
| .create = eth_header, |
| .parse = header_parse_80211, |
| .rebuild = eth_rebuild_header, |
| .cache = eth_header_cache, |
| .cache_update = eth_header_cache_update, |
| }; |
| |
| /* Must not be called for mdev */ |
| void ieee80211_if_setup(struct net_device *dev) |
| { |
| ether_setup(dev); |
| dev->hard_start_xmit = ieee80211_subif_start_xmit; |
| dev->wireless_handlers = &ieee80211_iw_handler_def; |
| dev->set_multicast_list = ieee80211_set_multicast_list; |
| dev->change_mtu = ieee80211_change_mtu; |
| dev->open = ieee80211_open; |
| dev->stop = ieee80211_stop; |
| dev->destructor = ieee80211_if_free; |
| } |
| |
| /* WDS specialties */ |
| |
| int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct sta_info *sta; |
| DECLARE_MAC_BUF(mac); |
| |
| if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0) |
| return 0; |
| |
| /* Create STA entry for the new peer */ |
| sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL); |
| if (!sta) |
| return -ENOMEM; |
| |
| sta->flags |= WLAN_STA_AUTHORIZED; |
| |
| sta_info_put(sta); |
| |
| /* Remove STA entry for the old peer */ |
| sta = sta_info_get(local, sdata->u.wds.remote_addr); |
| if (sta) { |
| sta_info_free(sta); |
| sta_info_put(sta); |
| } else { |
| printk(KERN_DEBUG "%s: could not find STA entry for WDS link " |
| "peer %s\n", |
| dev->name, print_mac(mac, sdata->u.wds.remote_addr)); |
| } |
| |
| /* Update WDS link data */ |
| memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN); |
| |
| return 0; |
| } |
| |
| /* everything else */ |
| |
| static int __ieee80211_if_config(struct net_device *dev, |
| struct sk_buff *beacon, |
| struct ieee80211_tx_control *control) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_if_conf conf; |
| |
| if (!local->ops->config_interface || !netif_running(dev)) |
| return 0; |
| |
| memset(&conf, 0, sizeof(conf)); |
| conf.type = sdata->vif.type; |
| if (sdata->vif.type == IEEE80211_IF_TYPE_STA || |
| sdata->vif.type == IEEE80211_IF_TYPE_IBSS) { |
| conf.bssid = sdata->u.sta.bssid; |
| conf.ssid = sdata->u.sta.ssid; |
| conf.ssid_len = sdata->u.sta.ssid_len; |
| } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) { |
| conf.ssid = sdata->u.ap.ssid; |
| conf.ssid_len = sdata->u.ap.ssid_len; |
| conf.beacon = beacon; |
| conf.beacon_control = control; |
| } |
| return local->ops->config_interface(local_to_hw(local), |
| &sdata->vif, &conf); |
| } |
| |
| int ieee80211_if_config(struct net_device *dev) |
| { |
| return __ieee80211_if_config(dev, NULL, NULL); |
| } |
| |
| int ieee80211_if_config_beacon(struct net_device *dev) |
| { |
| struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| struct ieee80211_tx_control control; |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct sk_buff *skb; |
| |
| if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE)) |
| return 0; |
| skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif, |
| &control); |
| if (!skb) |
| return -ENOMEM; |
| return __ieee80211_if_config(dev, skb, &control); |
| } |
| |
| int ieee80211_hw_config(struct ieee80211_local *local) |
| { |
| struct ieee80211_channel *chan; |
| int ret = 0; |
| |
| if (local->sta_sw_scanning) |
| chan = local->scan_channel; |
| else |
| chan = local->oper_channel; |
| |
| local->hw.conf.channel = chan; |
| |
| if (!local->hw.conf.power_level) |
| local->hw.conf.power_level = chan->max_power; |
| else |
| local->hw.conf.power_level = min(chan->max_power, |
| local->hw.conf.power_level); |
| |
| local->hw.conf.max_antenna_gain = chan->max_antenna_gain; |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n", |
| wiphy_name(local->hw.wiphy), chan->center_freq); |
| #endif |
| |
| if (local->open_count) |
| ret = local->ops->config(local_to_hw(local), &local->hw.conf); |
| |
| return ret; |
| } |
| |
| /** |
| * ieee80211_hw_config_ht should be used only after legacy configuration |
| * has been determined, as ht configuration depends upon the hardware's |
| * HT abilities for a _specific_ band. |
| */ |
| int ieee80211_hw_config_ht(struct ieee80211_local *local, int enable_ht, |
| struct ieee80211_ht_info *req_ht_cap, |
| struct ieee80211_ht_bss_info *req_bss_cap) |
| { |
| struct ieee80211_conf *conf = &local->hw.conf; |
| struct ieee80211_supported_band *sband; |
| int i; |
| |
| sband = local->hw.wiphy->bands[conf->channel->band]; |
| |
| /* HT is not supported */ |
| if (!sband->ht_info.ht_supported) { |
| conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; |
| return -EOPNOTSUPP; |
| } |
| |
| /* disable HT */ |
| if (!enable_ht) { |
| conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE; |
| } else { |
| conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE; |
| conf->ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap; |
| conf->ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS); |
| conf->ht_conf.cap |= |
| sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS; |
| conf->ht_bss_conf.primary_channel = |
| req_bss_cap->primary_channel; |
| conf->ht_bss_conf.bss_cap = req_bss_cap->bss_cap; |
| conf->ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode; |
| for (i = 0; i < SUPP_MCS_SET_LEN; i++) |
| conf->ht_conf.supp_mcs_set[i] = |
| sband->ht_info.supp_mcs_set[i] & |
| req_ht_cap->supp_mcs_set[i]; |
| |
| /* In STA mode, this gives us indication |
| * to the AP's mode of operation */ |
| conf->ht_conf.ht_supported = 1; |
| conf->ht_conf.ampdu_factor = req_ht_cap->ampdu_factor; |
| conf->ht_conf.ampdu_density = req_ht_cap->ampdu_density; |
| } |
| |
| local->ops->conf_ht(local_to_hw(local), &local->hw.conf); |
| |
| return 0; |
| } |
| |
| void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, |
| u32 changed) |
| { |
| struct ieee80211_local *local = sdata->local; |
| |
| if (!changed) |
| return; |
| |
| if (local->ops->bss_info_changed) |
| local->ops->bss_info_changed(local_to_hw(local), |
| &sdata->vif, |
| &sdata->bss_conf, |
| changed); |
| } |
| |
| void ieee80211_reset_erp_info(struct net_device *dev) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| |
| sdata->bss_conf.use_cts_prot = 0; |
| sdata->bss_conf.use_short_preamble = 0; |
| ieee80211_bss_info_change_notify(sdata, |
| BSS_CHANGED_ERP_CTS_PROT | |
| BSS_CHANGED_ERP_PREAMBLE); |
| } |
| |
| void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, |
| struct sk_buff *skb, |
| struct ieee80211_tx_status *status) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_tx_status *saved; |
| int tmp; |
| |
| skb->dev = local->mdev; |
| saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC); |
| if (unlikely(!saved)) { |
| if (net_ratelimit()) |
| printk(KERN_WARNING "%s: Not enough memory, " |
| "dropping tx status", skb->dev->name); |
| /* should be dev_kfree_skb_irq, but due to this function being |
| * named _irqsafe instead of just _irq we can't be sure that |
| * people won't call it from non-irq contexts */ |
| dev_kfree_skb_any(skb); |
| return; |
| } |
| memcpy(saved, status, sizeof(struct ieee80211_tx_status)); |
| /* copy pointer to saved status into skb->cb for use by tasklet */ |
| memcpy(skb->cb, &saved, sizeof(saved)); |
| |
| skb->pkt_type = IEEE80211_TX_STATUS_MSG; |
| skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ? |
| &local->skb_queue : &local->skb_queue_unreliable, skb); |
| tmp = skb_queue_len(&local->skb_queue) + |
| skb_queue_len(&local->skb_queue_unreliable); |
| while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && |
| (skb = skb_dequeue(&local->skb_queue_unreliable))) { |
| memcpy(&saved, skb->cb, sizeof(saved)); |
| kfree(saved); |
| dev_kfree_skb_irq(skb); |
| tmp--; |
| I802_DEBUG_INC(local->tx_status_drop); |
| } |
| tasklet_schedule(&local->tasklet); |
| } |
| EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); |
| |
| static void ieee80211_tasklet_handler(unsigned long data) |
| { |
| struct ieee80211_local *local = (struct ieee80211_local *) data; |
| struct sk_buff *skb; |
| struct ieee80211_rx_status rx_status; |
| struct ieee80211_tx_status *tx_status; |
| struct ieee80211_ra_tid *ra_tid; |
| |
| while ((skb = skb_dequeue(&local->skb_queue)) || |
| (skb = skb_dequeue(&local->skb_queue_unreliable))) { |
| switch (skb->pkt_type) { |
| case IEEE80211_RX_MSG: |
| /* status is in skb->cb */ |
| memcpy(&rx_status, skb->cb, sizeof(rx_status)); |
| /* Clear skb->pkt_type in order to not confuse kernel |
| * netstack. */ |
| skb->pkt_type = 0; |
| __ieee80211_rx(local_to_hw(local), skb, &rx_status); |
| break; |
| case IEEE80211_TX_STATUS_MSG: |
| /* get pointer to saved status out of skb->cb */ |
| memcpy(&tx_status, skb->cb, sizeof(tx_status)); |
| skb->pkt_type = 0; |
| ieee80211_tx_status(local_to_hw(local), |
| skb, tx_status); |
| kfree(tx_status); |
| break; |
| case IEEE80211_DELBA_MSG: |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| ieee80211_stop_tx_ba_cb(local_to_hw(local), |
| ra_tid->ra, ra_tid->tid); |
| dev_kfree_skb(skb); |
| break; |
| case IEEE80211_ADDBA_MSG: |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| ieee80211_start_tx_ba_cb(local_to_hw(local), |
| ra_tid->ra, ra_tid->tid); |
| dev_kfree_skb(skb); |
| break ; |
| default: /* should never get here! */ |
| printk(KERN_ERR "%s: Unknown message type (%d)\n", |
| wiphy_name(local->hw.wiphy), skb->pkt_type); |
| dev_kfree_skb(skb); |
| break; |
| } |
| } |
| } |
| |
| /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to |
| * make a prepared TX frame (one that has been given to hw) to look like brand |
| * new IEEE 802.11 frame that is ready to go through TX processing again. |
| * Also, tx_packet_data in cb is restored from tx_control. */ |
| static void ieee80211_remove_tx_extra(struct ieee80211_local *local, |
| struct ieee80211_key *key, |
| struct sk_buff *skb, |
| struct ieee80211_tx_control *control) |
| { |
| int hdrlen, iv_len, mic_len; |
| struct ieee80211_tx_packet_data *pkt_data; |
| |
| pkt_data = (struct ieee80211_tx_packet_data *)skb->cb; |
| pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex; |
| pkt_data->flags = 0; |
| if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS) |
| pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS; |
| if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT) |
| pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT; |
| if (control->flags & IEEE80211_TXCTL_REQUEUE) |
| pkt_data->flags |= IEEE80211_TXPD_REQUEUE; |
| if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME) |
| pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME; |
| pkt_data->queue = control->queue; |
| |
| hdrlen = ieee80211_get_hdrlen_from_skb(skb); |
| |
| if (!key) |
| goto no_key; |
| |
| switch (key->conf.alg) { |
| case ALG_WEP: |
| iv_len = WEP_IV_LEN; |
| mic_len = WEP_ICV_LEN; |
| break; |
| case ALG_TKIP: |
| iv_len = TKIP_IV_LEN; |
| mic_len = TKIP_ICV_LEN; |
| break; |
| case ALG_CCMP: |
| iv_len = CCMP_HDR_LEN; |
| mic_len = CCMP_MIC_LEN; |
| break; |
| default: |
| goto no_key; |
| } |
| |
| if (skb->len >= mic_len && |
| !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
| skb_trim(skb, skb->len - mic_len); |
| if (skb->len >= iv_len && skb->len > hdrlen) { |
| memmove(skb->data + iv_len, skb->data, hdrlen); |
| skb_pull(skb, iv_len); |
| } |
| |
| no_key: |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| u16 fc = le16_to_cpu(hdr->frame_control); |
| if ((fc & 0x8C) == 0x88) /* QoS Control Field */ { |
| fc &= ~IEEE80211_STYPE_QOS_DATA; |
| hdr->frame_control = cpu_to_le16(fc); |
| memmove(skb->data + 2, skb->data, hdrlen - 2); |
| skb_pull(skb, 2); |
| } |
| } |
| } |
| |
| static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, |
| struct sta_info *sta, |
| struct sk_buff *skb, |
| struct ieee80211_tx_status *status) |
| { |
| sta->tx_filtered_count++; |
| |
| /* |
| * Clear the TX filter mask for this STA when sending the next |
| * packet. If the STA went to power save mode, this will happen |
| * happen when it wakes up for the next time. |
| */ |
| sta->flags |= WLAN_STA_CLEAR_PS_FILT; |
| |
| /* |
| * This code races in the following way: |
| * |
| * (1) STA sends frame indicating it will go to sleep and does so |
| * (2) hardware/firmware adds STA to filter list, passes frame up |
| * (3) hardware/firmware processes TX fifo and suppresses a frame |
| * (4) we get TX status before having processed the frame and |
| * knowing that the STA has gone to sleep. |
| * |
| * This is actually quite unlikely even when both those events are |
| * processed from interrupts coming in quickly after one another or |
| * even at the same time because we queue both TX status events and |
| * RX frames to be processed by a tasklet and process them in the |
| * same order that they were received or TX status last. Hence, there |
| * is no race as long as the frame RX is processed before the next TX |
| * status, which drivers can ensure, see below. |
| * |
| * Note that this can only happen if the hardware or firmware can |
| * actually add STAs to the filter list, if this is done by the |
| * driver in response to set_tim() (which will only reduce the race |
| * this whole filtering tries to solve, not completely solve it) |
| * this situation cannot happen. |
| * |
| * To completely solve this race drivers need to make sure that they |
| * (a) don't mix the irq-safe/not irq-safe TX status/RX processing |
| * functions and |
| * (b) always process RX events before TX status events if ordering |
| * can be unknown, for example with different interrupt status |
| * bits. |
| */ |
| if (sta->flags & WLAN_STA_PS && |
| skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { |
| ieee80211_remove_tx_extra(local, sta->key, skb, |
| &status->control); |
| skb_queue_tail(&sta->tx_filtered, skb); |
| return; |
| } |
| |
| if (!(sta->flags & WLAN_STA_PS) && |
| !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) { |
| /* Software retry the packet once */ |
| status->control.flags |= IEEE80211_TXCTL_REQUEUE; |
| ieee80211_remove_tx_extra(local, sta->key, skb, |
| &status->control); |
| dev_queue_xmit(skb); |
| return; |
| } |
| |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "%s: dropped TX filtered frame, " |
| "queue_len=%d PS=%d @%lu\n", |
| wiphy_name(local->hw.wiphy), |
| skb_queue_len(&sta->tx_filtered), |
| !!(sta->flags & WLAN_STA_PS), jiffies); |
| dev_kfree_skb(skb); |
| } |
| |
| void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb, |
| struct ieee80211_tx_status *status) |
| { |
| struct sk_buff *skb2; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct ieee80211_local *local = hw_to_local(hw); |
| u16 frag, type; |
| struct ieee80211_tx_status_rtap_hdr *rthdr; |
| struct ieee80211_sub_if_data *sdata; |
| struct net_device *prev_dev = NULL; |
| |
| if (!status) { |
| printk(KERN_ERR |
| "%s: ieee80211_tx_status called with NULL status\n", |
| wiphy_name(local->hw.wiphy)); |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| if (status->excessive_retries) { |
| struct sta_info *sta; |
| sta = sta_info_get(local, hdr->addr1); |
| if (sta) { |
| if (sta->flags & WLAN_STA_PS) { |
| /* |
| * The STA is in power save mode, so assume |
| * that this TX packet failed because of that. |
| */ |
| status->excessive_retries = 0; |
| status->flags |= IEEE80211_TX_STATUS_TX_FILTERED; |
| ieee80211_handle_filtered_frame(local, sta, |
| skb, status); |
| sta_info_put(sta); |
| return; |
| } |
| sta_info_put(sta); |
| } |
| } |
| |
| if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) { |
| struct sta_info *sta; |
| sta = sta_info_get(local, hdr->addr1); |
| if (sta) { |
| ieee80211_handle_filtered_frame(local, sta, skb, |
| status); |
| sta_info_put(sta); |
| return; |
| } |
| } else |
| rate_control_tx_status(local->mdev, skb, status); |
| |
| ieee80211_led_tx(local, 0); |
| |
| /* SNMP counters |
| * Fragments are passed to low-level drivers as separate skbs, so these |
| * are actually fragments, not frames. Update frame counters only for |
| * the first fragment of the frame. */ |
| |
| frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG; |
| type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE; |
| |
| if (status->flags & IEEE80211_TX_STATUS_ACK) { |
| if (frag == 0) { |
| local->dot11TransmittedFrameCount++; |
| if (is_multicast_ether_addr(hdr->addr1)) |
| local->dot11MulticastTransmittedFrameCount++; |
| if (status->retry_count > 0) |
| local->dot11RetryCount++; |
| if (status->retry_count > 1) |
| local->dot11MultipleRetryCount++; |
| } |
| |
| /* This counter shall be incremented for an acknowledged MPDU |
| * with an individual address in the address 1 field or an MPDU |
| * with a multicast address in the address 1 field of type Data |
| * or Management. */ |
| if (!is_multicast_ether_addr(hdr->addr1) || |
| type == IEEE80211_FTYPE_DATA || |
| type == IEEE80211_FTYPE_MGMT) |
| local->dot11TransmittedFragmentCount++; |
| } else { |
| if (frag == 0) |
| local->dot11FailedCount++; |
| } |
| |
| /* this was a transmitted frame, but now we want to reuse it */ |
| skb_orphan(skb); |
| |
| /* |
| * This is a bit racy but we can avoid a lot of work |
| * with this test... |
| */ |
| if (!local->monitors && !local->cooked_mntrs) { |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| /* send frame to monitor interfaces now */ |
| |
| if (skb_headroom(skb) < sizeof(*rthdr)) { |
| printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); |
| dev_kfree_skb(skb); |
| return; |
| } |
| |
| rthdr = (struct ieee80211_tx_status_rtap_hdr*) |
| skb_push(skb, sizeof(*rthdr)); |
| |
| memset(rthdr, 0, sizeof(*rthdr)); |
| rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); |
| rthdr->hdr.it_present = |
| cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); |
| |
| if (!(status->flags & IEEE80211_TX_STATUS_ACK) && |
| !is_multicast_ether_addr(hdr->addr1)) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); |
| |
| if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) && |
| (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); |
| else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) |
| rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); |
| |
| rthdr->data_retries = status->retry_count; |
| |
| /* XXX: is this sufficient for BPF? */ |
| skb_set_mac_header(skb, 0); |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| skb->pkt_type = PACKET_OTHERHOST; |
| skb->protocol = htons(ETH_P_802_2); |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) { |
| if (!netif_running(sdata->dev)) |
| continue; |
| |
| if (prev_dev) { |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) { |
| skb2->dev = prev_dev; |
| netif_rx(skb2); |
| } |
| } |
| |
| prev_dev = sdata->dev; |
| } |
| } |
| if (prev_dev) { |
| skb->dev = prev_dev; |
| netif_rx(skb); |
| skb = NULL; |
| } |
| rcu_read_unlock(); |
| dev_kfree_skb(skb); |
| } |
| EXPORT_SYMBOL(ieee80211_tx_status); |
| |
| struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, |
| const struct ieee80211_ops *ops) |
| { |
| struct ieee80211_local *local; |
| int priv_size; |
| struct wiphy *wiphy; |
| |
| /* Ensure 32-byte alignment of our private data and hw private data. |
| * We use the wiphy priv data for both our ieee80211_local and for |
| * the driver's private data |
| * |
| * In memory it'll be like this: |
| * |
| * +-------------------------+ |
| * | struct wiphy | |
| * +-------------------------+ |
| * | struct ieee80211_local | |
| * +-------------------------+ |
| * | driver's private data | |
| * +-------------------------+ |
| * |
| */ |
| priv_size = ((sizeof(struct ieee80211_local) + |
| NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) + |
| priv_data_len; |
| |
| wiphy = wiphy_new(&mac80211_config_ops, priv_size); |
| |
| if (!wiphy) |
| return NULL; |
| |
| wiphy->privid = mac80211_wiphy_privid; |
| |
| local = wiphy_priv(wiphy); |
| local->hw.wiphy = wiphy; |
| |
| local->hw.priv = (char *)local + |
| ((sizeof(struct ieee80211_local) + |
| NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); |
| |
| BUG_ON(!ops->tx); |
| BUG_ON(!ops->start); |
| BUG_ON(!ops->stop); |
| BUG_ON(!ops->config); |
| BUG_ON(!ops->add_interface); |
| BUG_ON(!ops->remove_interface); |
| BUG_ON(!ops->configure_filter); |
| local->ops = ops; |
| |
| local->hw.queues = 1; /* default */ |
| |
| local->bridge_packets = 1; |
| |
| local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD; |
| local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD; |
| local->short_retry_limit = 7; |
| local->long_retry_limit = 4; |
| local->hw.conf.radio_enabled = 1; |
| |
| INIT_LIST_HEAD(&local->interfaces); |
| |
| INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work); |
| |
| sta_info_init(local); |
| |
| tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, |
| (unsigned long)local); |
| tasklet_disable(&local->tx_pending_tasklet); |
| |
| tasklet_init(&local->tasklet, |
| ieee80211_tasklet_handler, |
| (unsigned long) local); |
| tasklet_disable(&local->tasklet); |
| |
| skb_queue_head_init(&local->skb_queue); |
| skb_queue_head_init(&local->skb_queue_unreliable); |
| |
| return local_to_hw(local); |
| } |
| EXPORT_SYMBOL(ieee80211_alloc_hw); |
| |
| int ieee80211_register_hw(struct ieee80211_hw *hw) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| const char *name; |
| int result; |
| enum ieee80211_band band; |
| struct net_device *mdev; |
| struct ieee80211_sub_if_data *sdata; |
| |
| /* |
| * generic code guarantees at least one band, |
| * set this very early because much code assumes |
| * that hw.conf.channel is assigned |
| */ |
| for (band = 0; band < IEEE80211_NUM_BANDS; band++) { |
| struct ieee80211_supported_band *sband; |
| |
| sband = local->hw.wiphy->bands[band]; |
| if (sband) { |
| /* init channel we're on */ |
| local->hw.conf.channel = |
| local->oper_channel = |
| local->scan_channel = &sband->channels[0]; |
| break; |
| } |
| } |
| |
| result = wiphy_register(local->hw.wiphy); |
| if (result < 0) |
| return result; |
| |
| /* for now, mdev needs sub_if_data :/ */ |
| mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), |
| "wmaster%d", ether_setup); |
| if (!mdev) |
| goto fail_mdev_alloc; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(mdev); |
| mdev->ieee80211_ptr = &sdata->wdev; |
| sdata->wdev.wiphy = local->hw.wiphy; |
| |
| local->mdev = mdev; |
| |
| ieee80211_rx_bss_list_init(mdev); |
| |
| mdev->hard_start_xmit = ieee80211_master_start_xmit; |
| mdev->open = ieee80211_master_open; |
| mdev->stop = ieee80211_master_stop; |
| mdev->type = ARPHRD_IEEE80211; |
| mdev->header_ops = &ieee80211_header_ops; |
| mdev->set_multicast_list = ieee80211_master_set_multicast_list; |
| |
| sdata->vif.type = IEEE80211_IF_TYPE_AP; |
| sdata->dev = mdev; |
| sdata->local = local; |
| sdata->u.ap.force_unicast_rateidx = -1; |
| sdata->u.ap.max_ratectrl_rateidx = -1; |
| ieee80211_if_sdata_init(sdata); |
| |
| /* no RCU needed since we're still during init phase */ |
| list_add_tail(&sdata->list, &local->interfaces); |
| |
| name = wiphy_dev(local->hw.wiphy)->driver->name; |
| local->hw.workqueue = create_singlethread_workqueue(name); |
| if (!local->hw.workqueue) { |
| result = -ENOMEM; |
| goto fail_workqueue; |
| } |
| |
| /* |
| * The hardware needs headroom for sending the frame, |
| * and we need some headroom for passing the frame to monitor |
| * interfaces, but never both at the same time. |
| */ |
| local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, |
| sizeof(struct ieee80211_tx_status_rtap_hdr)); |
| |
| debugfs_hw_add(local); |
| |
| local->hw.conf.beacon_int = 1000; |
| |
| local->wstats_flags |= local->hw.max_rssi ? |
| IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID; |
| local->wstats_flags |= local->hw.max_signal ? |
| IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID; |
| local->wstats_flags |= local->hw.max_noise ? |
| IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID; |
| if (local->hw.max_rssi < 0 || local->hw.max_noise < 0) |
| local->wstats_flags |= IW_QUAL_DBM; |
| |
| result = sta_info_start(local); |
| if (result < 0) |
| goto fail_sta_info; |
| |
| rtnl_lock(); |
| result = dev_alloc_name(local->mdev, local->mdev->name); |
| if (result < 0) |
| goto fail_dev; |
| |
| memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN); |
| SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy)); |
| |
| result = register_netdevice(local->mdev); |
| if (result < 0) |
| goto fail_dev; |
| |
| ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev)); |
| ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP); |
| |
| result = ieee80211_init_rate_ctrl_alg(local, |
| hw->rate_control_algorithm); |
| if (result < 0) { |
| printk(KERN_DEBUG "%s: Failed to initialize rate control " |
| "algorithm\n", wiphy_name(local->hw.wiphy)); |
| goto fail_rate; |
| } |
| |
| result = ieee80211_wep_init(local); |
| |
| if (result < 0) { |
| printk(KERN_DEBUG "%s: Failed to initialize wep\n", |
| wiphy_name(local->hw.wiphy)); |
| goto fail_wep; |
| } |
| |
| ieee80211_install_qdisc(local->mdev); |
| |
| /* add one default STA interface */ |
| result = ieee80211_if_add(local->mdev, "wlan%d", NULL, |
| IEEE80211_IF_TYPE_STA); |
| if (result) |
| printk(KERN_WARNING "%s: Failed to add default virtual iface\n", |
| wiphy_name(local->hw.wiphy)); |
| |
| local->reg_state = IEEE80211_DEV_REGISTERED; |
| rtnl_unlock(); |
| |
| ieee80211_led_init(local); |
| |
| return 0; |
| |
| fail_wep: |
| rate_control_deinitialize(local); |
| fail_rate: |
| ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev)); |
| unregister_netdevice(local->mdev); |
| fail_dev: |
| rtnl_unlock(); |
| sta_info_stop(local); |
| fail_sta_info: |
| debugfs_hw_del(local); |
| destroy_workqueue(local->hw.workqueue); |
| fail_workqueue: |
| ieee80211_if_free(local->mdev); |
| local->mdev = NULL; |
| fail_mdev_alloc: |
| wiphy_unregister(local->hw.wiphy); |
| return result; |
| } |
| EXPORT_SYMBOL(ieee80211_register_hw); |
| |
| void ieee80211_unregister_hw(struct ieee80211_hw *hw) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_sub_if_data *sdata, *tmp; |
| |
| tasklet_kill(&local->tx_pending_tasklet); |
| tasklet_kill(&local->tasklet); |
| |
| rtnl_lock(); |
| |
| BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED); |
| |
| local->reg_state = IEEE80211_DEV_UNREGISTERED; |
| |
| /* |
| * At this point, interface list manipulations are fine |
| * because the driver cannot be handing us frames any |
| * more and the tasklet is killed. |
| */ |
| |
| /* |
| * First, we remove all non-master interfaces. Do this because they |
| * may have bss pointer dependency on the master, and when we free |
| * the master these would be freed as well, breaking our list |
| * iteration completely. |
| */ |
| list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) { |
| if (sdata->dev == local->mdev) |
| continue; |
| list_del(&sdata->list); |
| __ieee80211_if_del(local, sdata); |
| } |
| |
| /* then, finally, remove the master interface */ |
| __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev)); |
| |
| rtnl_unlock(); |
| |
| ieee80211_rx_bss_list_deinit(local->mdev); |
| ieee80211_clear_tx_pending(local); |
| sta_info_stop(local); |
| rate_control_deinitialize(local); |
| debugfs_hw_del(local); |
| |
| if (skb_queue_len(&local->skb_queue) |
| || skb_queue_len(&local->skb_queue_unreliable)) |
| printk(KERN_WARNING "%s: skb_queue not empty\n", |
| wiphy_name(local->hw.wiphy)); |
| skb_queue_purge(&local->skb_queue); |
| skb_queue_purge(&local->skb_queue_unreliable); |
| |
| destroy_workqueue(local->hw.workqueue); |
| wiphy_unregister(local->hw.wiphy); |
| ieee80211_wep_free(local); |
| ieee80211_led_exit(local); |
| ieee80211_if_free(local->mdev); |
| local->mdev = NULL; |
| } |
| EXPORT_SYMBOL(ieee80211_unregister_hw); |
| |
| void ieee80211_free_hw(struct ieee80211_hw *hw) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| |
| wiphy_free(local->hw.wiphy); |
| } |
| EXPORT_SYMBOL(ieee80211_free_hw); |
| |
| static int __init ieee80211_init(void) |
| { |
| struct sk_buff *skb; |
| int ret; |
| |
| BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb)); |
| |
| ret = rc80211_simple_init(); |
| if (ret) |
| goto out; |
| |
| ret = rc80211_pid_init(); |
| if (ret) |
| goto out_cleanup_simple; |
| |
| ret = ieee80211_wme_register(); |
| if (ret) { |
| printk(KERN_DEBUG "ieee80211_init: failed to " |
| "initialize WME (err=%d)\n", ret); |
| goto out_cleanup_pid; |
| } |
| |
| ieee80211_debugfs_netdev_init(); |
| |
| return 0; |
| |
| out_cleanup_pid: |
| rc80211_pid_exit(); |
| out_cleanup_simple: |
| rc80211_simple_exit(); |
| out: |
| return ret; |
| } |
| |
| static void __exit ieee80211_exit(void) |
| { |
| rc80211_simple_exit(); |
| rc80211_pid_exit(); |
| |
| ieee80211_wme_unregister(); |
| ieee80211_debugfs_netdev_exit(); |
| } |
| |
| |
| subsys_initcall(ieee80211_init); |
| module_exit(ieee80211_exit); |
| |
| MODULE_DESCRIPTION("IEEE 802.11 subsystem"); |
| MODULE_LICENSE("GPL"); |