/* Copyright (C) 2004 - 2008 rt2x00 SourceForge Project This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Module: rt2x00mac Abstract: rt2x00 generic mac80211 routines. */ #include #include #include "rt2x00.h" #include "rt2x00lib.h" static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev, struct data_queue *queue, struct sk_buff *frag_skb) { struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb); struct ieee80211_tx_info *rts_info; struct sk_buff *skb; unsigned int data_length; int retval = 0; if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) data_length = sizeof(struct ieee80211_cts); else data_length = sizeof(struct ieee80211_rts); skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom); if (unlikely(!skb)) { WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n"); return -ENOMEM; } skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom); skb_put(skb, data_length); /* * Copy TX information over from original frame to * RTS/CTS frame. Note that we set the no encryption flag * since we don't want this frame to be encrypted. * RTS frames should be acked, while CTS-to-self frames * should not. The ready for TX flag is cleared to prevent * it being automatically send when the descriptor is * written to the hardware. */ memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb)); rts_info = IEEE80211_SKB_CB(skb); rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS; rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT; rts_info->flags &= ~IEEE80211_TX_CTL_REQ_TX_STATUS; if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) rts_info->flags |= IEEE80211_TX_CTL_NO_ACK; else rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK; skb->do_not_encrypt = 1; /* * RTS/CTS frame should use the length of the frame plus any * encryption overhead that will be added by the hardware. */ if (!frag_skb->do_not_encrypt) data_length += rt2x00crypto_tx_overhead(tx_info); if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif, frag_skb->data, data_length, tx_info, (struct ieee80211_cts *)(skb->data)); else ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif, frag_skb->data, data_length, tx_info, (struct ieee80211_rts *)(skb->data)); retval = rt2x00queue_write_tx_frame(queue, skb); if (retval) { dev_kfree_skb_any(skb); WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n"); } return retval; } int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb) { struct rt2x00_dev *rt2x00dev = hw->priv; struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data; enum data_queue_qid qid = skb_get_queue_mapping(skb); struct data_queue *queue; u16 frame_control; /* * Mac80211 might be calling this function while we are trying * to remove the device or perhaps suspending it. * Note that we can only stop the TX queues inside the TX path * due to possible race conditions in mac80211. */ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) goto exit_fail; /* * Determine which queue to put packet on. */ if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM && test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags)) queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM); else queue = rt2x00queue_get_queue(rt2x00dev, qid); if (unlikely(!queue)) { ERROR(rt2x00dev, "Attempt to send packet over invalid queue %d.\n" "Please file bug report to %s.\n", qid, DRV_PROJECT); goto exit_fail; } /* * If CTS/RTS is required. create and queue that frame first. * Make sure we have at least enough entries available to send * this CTS/RTS frame as well as the data frame. * Note that when the driver has set the set_rts_threshold() * callback function it doesn't need software generation of * either RTS or CTS-to-self frame and handles everything * inside the hardware. */ frame_control = le16_to_cpu(ieee80211hdr->frame_control); if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS | IEEE80211_TX_RC_USE_CTS_PROTECT)) && !rt2x00dev->ops->hw->set_rts_threshold) { if (rt2x00queue_available(queue) <= 1) goto exit_fail; if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb)) goto exit_fail; } if (rt2x00queue_write_tx_frame(queue, skb)) goto exit_fail; if (rt2x00queue_threshold(queue)) ieee80211_stop_queue(rt2x00dev->hw, qid); return NETDEV_TX_OK; exit_fail: ieee80211_stop_queue(rt2x00dev->hw, qid); dev_kfree_skb_any(skb); return NETDEV_TX_OK; } EXPORT_SYMBOL_GPL(rt2x00mac_tx); int rt2x00mac_start(struct ieee80211_hw *hw) { struct rt2x00_dev *rt2x00dev = hw->priv; if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; return rt2x00lib_start(rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00mac_start); void rt2x00mac_stop(struct ieee80211_hw *hw) { struct rt2x00_dev *rt2x00dev = hw->priv; if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return; rt2x00lib_stop(rt2x00dev); } EXPORT_SYMBOL_GPL(rt2x00mac_stop); int rt2x00mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(conf->vif); struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON); struct queue_entry *entry = NULL; unsigned int i; /* * Don't allow interfaces to be added * the device has disappeared. */ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) || !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) return -ENODEV; switch (conf->type) { case NL80211_IFTYPE_AP: /* * We don't support mixed combinations of * sta and ap interfaces. */ if (rt2x00dev->intf_sta_count) return -ENOBUFS; /* * Check if we exceeded the maximum amount * of supported interfaces. */ if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) return -ENOBUFS; break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_MESH_POINT: /* * We don't support mixed combinations of * sta and ap interfaces. */ if (rt2x00dev->intf_ap_count) return -ENOBUFS; /* * Check if we exceeded the maximum amount * of supported interfaces. */ if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf) return -ENOBUFS; break; default: return -EINVAL; } /* * Loop through all beacon queues to find a free * entry. Since there are as much beacon entries * as the maximum interfaces, this search shouldn't * fail. */ for (i = 0; i < queue->limit; i++) { entry = &queue->entries[i]; if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags)) break; } if (unlikely(i == queue->limit)) return -ENOBUFS; /* * We are now absolutely sure the interface can be created, * increase interface count and start initialization. */ if (conf->type == NL80211_IFTYPE_AP) rt2x00dev->intf_ap_count++; else rt2x00dev->intf_sta_count++; spin_lock_init(&intf->lock); spin_lock_init(&intf->seqlock); intf->beacon = entry; if (conf->type == NL80211_IFTYPE_AP) memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN); memcpy(&intf->mac, conf->mac_addr, ETH_ALEN); /* * The MAC adddress must be configured after the device * has been initialized. Otherwise the device can reset * the MAC registers. */ rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL); /* * Some filters depend on the current working mode. We can force * an update during the next configure_filter() run by mac80211 by * resetting the current packet_filter state. */ rt2x00dev->packet_filter = 0; return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_add_interface); void rt2x00mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_if_init_conf *conf) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(conf->vif); /* * Don't allow interfaces to be remove while * either the device has disappeared or when * no interface is present. */ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) || (conf->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) || (conf->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count)) return; if (conf->type == NL80211_IFTYPE_AP) rt2x00dev->intf_ap_count--; else rt2x00dev->intf_sta_count--; /* * Release beacon entry so it is available for * new interfaces again. */ clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags); /* * Make sure the bssid and mac address registers * are cleared to prevent false ACKing of frames. */ rt2x00lib_config_intf(rt2x00dev, intf, NL80211_IFTYPE_UNSPECIFIED, NULL, NULL); } EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface); int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed) { struct rt2x00_dev *rt2x00dev = hw->priv; struct ieee80211_conf *conf = &hw->conf; int status; /* * Mac80211 might be calling this function while we are trying * to remove the device or perhaps suspending it. */ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; /* * Only change device state when the radio is enabled. It does not * matter what parameters we have configured when the radio is disabled * because we won't be able to send or receive anyway. Also note that * some configuration parameters (e.g. channel and antenna values) can * only be set when the radio is enabled. */ if (conf->radio_enabled) { /* For programming the values, we have to turn RX off */ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF); /* Enable the radio */ status = rt2x00lib_enable_radio(rt2x00dev); if (unlikely(status)) return status; /* * When we've just turned on the radio, we want to reprogram * everything to ensure a consistent state */ rt2x00lib_config(rt2x00dev, conf, changed); /* * The radio was enabled, configure the antenna to the * default settings, the link tuner will later start * continue configuring the antenna based on the software * diversity. But for non-diversity configurations, we need * to have configured the correct state now. */ if (changed & IEEE80211_CONF_CHANGE_RADIO_ENABLED) rt2x00lib_config_antenna(rt2x00dev, &rt2x00dev->default_ant); /* Turn RX back on */ rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON); } else { /* Disable the radio */ rt2x00lib_disable_radio(rt2x00dev); } return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_config); int rt2x00mac_config_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_if_conf *conf) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(vif); int update_bssid = 0; int status = 0; /* * Mac80211 might be calling this function while we are trying * to remove the device or perhaps suspending it. */ if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; spin_lock(&intf->lock); /* * conf->bssid can be NULL if coming from the internal * beacon update routine. */ if (conf->changed & IEEE80211_IFCC_BSSID && conf->bssid) { update_bssid = 1; memcpy(&intf->bssid, conf->bssid, ETH_ALEN); } spin_unlock(&intf->lock); /* * Call rt2x00_config_intf() outside of the spinlock context since * the call will sleep for USB drivers. By using the ieee80211_if_conf * values as arguments we make keep access to rt2x00_intf thread safe * even without the lock. */ rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL, update_bssid ? conf->bssid : NULL); /* * Update the beacon. */ if (conf->changed & IEEE80211_IFCC_BEACON) status = rt2x00queue_update_beacon(rt2x00dev, vif); return status; } EXPORT_SYMBOL_GPL(rt2x00mac_config_interface); void rt2x00mac_configure_filter(struct ieee80211_hw *hw, unsigned int changed_flags, unsigned int *total_flags, int mc_count, struct dev_addr_list *mc_list) { struct rt2x00_dev *rt2x00dev = hw->priv; /* * Mask off any flags we are going to ignore * from the total_flags field. */ *total_flags &= FIF_ALLMULTI | FIF_FCSFAIL | FIF_PLCPFAIL | FIF_CONTROL | FIF_OTHER_BSS | FIF_PROMISC_IN_BSS; /* * Apply some rules to the filters: * - Some filters imply different filters to be set. * - Some things we can't filter out at all. * - Multicast filter seems to kill broadcast traffic so never use it. */ *total_flags |= FIF_ALLMULTI; if (*total_flags & FIF_OTHER_BSS || *total_flags & FIF_PROMISC_IN_BSS) *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS; /* * Check if there is any work left for us. */ if (rt2x00dev->packet_filter == *total_flags) return; rt2x00dev->packet_filter = *total_flags; if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags)) rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags); else queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work); } EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter); #ifdef CONFIG_RT2X00_LIB_CRYPTO int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, const u8 *local_address, const u8 *address, struct ieee80211_key_conf *key) { struct rt2x00_dev *rt2x00dev = hw->priv; struct ieee80211_sta *sta; int (*set_key) (struct rt2x00_dev *rt2x00dev, struct rt2x00lib_crypto *crypto, struct ieee80211_key_conf *key); struct rt2x00lib_crypto crypto; if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags)) return 0; else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) return -EOPNOTSUPP; else if (key->keylen > 32) return -ENOSPC; memset(&crypto, 0, sizeof(crypto)); /* * When in STA mode, bssidx is always 0 otherwise local_address[5] * contains the bss number, see BSS_ID_MASK comments for details. */ if (rt2x00dev->intf_sta_count) crypto.bssidx = 0; else crypto.bssidx = local_address[5] & (rt2x00dev->ops->max_ap_intf - 1); crypto.cipher = rt2x00crypto_key_to_cipher(key); if (crypto.cipher == CIPHER_NONE) return -EOPNOTSUPP; crypto.cmd = cmd; crypto.address = address; if (crypto.cipher == CIPHER_TKIP) { if (key->keylen > NL80211_TKIP_DATA_OFFSET_ENCR_KEY) memcpy(&crypto.key, &key->key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY], sizeof(crypto.key)); if (key->keylen > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY) memcpy(&crypto.tx_mic, &key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY], sizeof(crypto.tx_mic)); if (key->keylen > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY) memcpy(&crypto.rx_mic, &key->key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY], sizeof(crypto.rx_mic)); } else memcpy(&crypto.key, &key->key[0], key->keylen); /* * Discover the Association ID from mac80211. * Some drivers need this information when updating the * hardware key (either adding or removing). */ rcu_read_lock(); sta = ieee80211_find_sta(hw, address); if (sta) crypto.aid = sta->aid; rcu_read_unlock(); /* * Each BSS has a maximum of 4 shared keys. * Shared key index values: * 0) BSS0 key0 * 1) BSS0 key1 * ... * 4) BSS1 key0 * ... * 8) BSS2 key0 * ... * Both pairwise as shared key indeces are determined by * driver. This is required because the hardware requires * keys to be assigned in correct order (When key 1 is * provided but key 0 is not, then the key is not found * by the hardware during RX). */ if (cmd == SET_KEY) key->hw_key_idx = 0; if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE) set_key = rt2x00dev->ops->lib->config_pairwise_key; else set_key = rt2x00dev->ops->lib->config_shared_key; if (!set_key) return -EOPNOTSUPP; return set_key(rt2x00dev, &crypto, key); } EXPORT_SYMBOL_GPL(rt2x00mac_set_key); #endif /* CONFIG_RT2X00_LIB_CRYPTO */ int rt2x00mac_get_stats(struct ieee80211_hw *hw, struct ieee80211_low_level_stats *stats) { struct rt2x00_dev *rt2x00dev = hw->priv; /* * The dot11ACKFailureCount, dot11RTSFailureCount and * dot11RTSSuccessCount are updated in interrupt time. * dot11FCSErrorCount is updated in the link tuner. */ memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats)); return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_get_stats); int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw, struct ieee80211_tx_queue_stats *stats) { struct rt2x00_dev *rt2x00dev = hw->priv; unsigned int i; for (i = 0; i < rt2x00dev->ops->tx_queues; i++) { stats[i].len = rt2x00dev->tx[i].length; stats[i].limit = rt2x00dev->tx[i].limit; stats[i].count = rt2x00dev->tx[i].count; } return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats); void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_bss_conf *bss_conf, u32 changes) { struct rt2x00_dev *rt2x00dev = hw->priv; struct rt2x00_intf *intf = vif_to_intf(vif); unsigned int delayed = 0; /* * When the association status has changed we must reset the link * tuner counter. This is because some drivers determine if they * should perform link tuning based on the number of seconds * while associated or not associated. */ if (changes & BSS_CHANGED_ASSOC) { rt2x00dev->link.count = 0; if (bss_conf->assoc) rt2x00dev->intf_associated++; else rt2x00dev->intf_associated--; if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags)) rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated); else delayed |= DELAYED_LED_ASSOC; } /* * When the erp information has changed, we should perform * additional configuration steps. For all other changes we are done. */ if (changes & ~(BSS_CHANGED_ASSOC | BSS_CHANGED_HT)) { if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags)) rt2x00lib_config_erp(rt2x00dev, intf, bss_conf); else delayed |= DELAYED_CONFIG_ERP; } spin_lock(&intf->lock); if (delayed) { intf->delayed_flags |= delayed; schedule_work(&rt2x00dev->intf_work); } spin_unlock(&intf->lock); } EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed); int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx, const struct ieee80211_tx_queue_params *params) { struct rt2x00_dev *rt2x00dev = hw->priv; struct data_queue *queue; queue = rt2x00queue_get_queue(rt2x00dev, queue_idx); if (unlikely(!queue)) return -EINVAL; /* * The passed variables are stored as real value ((2^n)-1). * Ralink registers require to know the bit number 'n'. */ if (params->cw_min > 0) queue->cw_min = fls(params->cw_min); else queue->cw_min = 5; /* cw_min: 2^5 = 32. */ if (params->cw_max > 0) queue->cw_max = fls(params->cw_max); else queue->cw_max = 10; /* cw_min: 2^10 = 1024. */ queue->aifs = params->aifs; queue->txop = params->txop; INFO(rt2x00dev, "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n", queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop); return 0; } EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);