/* * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "rate.h" #include "mesh.h" #include "wep.h" #include "wme.h" #include "aes_ccm.h" #include "led.h" #include "cfg.h" #include "debugfs.h" #include "debugfs_netdev.h" /* * For seeing transmitted packets on monitor interfaces * we have a radiotap header too. */ struct ieee80211_tx_status_rtap_hdr { struct ieee80211_radiotap_header hdr; u8 rate; u8 padding_for_rate; __le16 tx_flags; u8 data_retries; } __attribute__ ((packed)); /* must be called under mdev tx lock */ 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 header_parse_80211(const struct sk_buff *skb, unsigned char *haddr) { memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */ return ETH_ALEN; } 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, }; static int ieee80211_master_open(struct net_device *dev) { struct ieee80211_master_priv *mpriv = netdev_priv(dev); struct ieee80211_local *local = mpriv->local; 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 (netif_running(sdata->dev)) { res = 0; break; } } if (res) return res; netif_tx_start_all_queues(local->mdev); return 0; } static int ieee80211_master_stop(struct net_device *dev) { struct ieee80211_master_priv *mpriv = netdev_priv(dev); struct ieee80211_local *local = mpriv->local; 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 (netif_running(sdata->dev)) dev_close(sdata->dev); return 0; } static void ieee80211_master_set_multicast_list(struct net_device *dev) { struct ieee80211_master_priv *mpriv = netdev_priv(dev); struct ieee80211_local *local = mpriv->local; ieee80211_configure_filter(local); } /* everything else */ int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_conf conf; if (WARN_ON(!netif_running(sdata->dev))) return 0; memset(&conf, 0, sizeof(conf)); if (sdata->vif.type == NL80211_IFTYPE_STATION) conf.bssid = sdata->u.mgd.bssid; else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) conf.bssid = sdata->u.ibss.bssid; else if (sdata->vif.type == NL80211_IFTYPE_AP) conf.bssid = sdata->dev->dev_addr; else if (ieee80211_vif_is_mesh(&sdata->vif)) { static const u8 zero[ETH_ALEN] = { 0 }; conf.bssid = zero; } else { WARN_ON(1); return -EINVAL; } if (!local->ops->config_interface) return 0; switch (sdata->vif.type) { case NL80211_IFTYPE_AP: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_MESH_POINT: break; default: /* do not warn to simplify caller in scan.c */ changed &= ~IEEE80211_IFCC_BEACON_ENABLED; if (WARN_ON(changed & IEEE80211_IFCC_BEACON)) return -EINVAL; changed &= ~IEEE80211_IFCC_BEACON; break; } if (changed & IEEE80211_IFCC_BEACON_ENABLED) { if (local->sw_scanning) { conf.enable_beacon = false; } else { /* * Beacon should be enabled, but AP mode must * check whether there is a beacon configured. */ switch (sdata->vif.type) { case NL80211_IFTYPE_AP: conf.enable_beacon = !!rcu_dereference(sdata->u.ap.beacon); break; case NL80211_IFTYPE_ADHOC: conf.enable_beacon = !!sdata->u.ibss.presp; break; case NL80211_IFTYPE_MESH_POINT: conf.enable_beacon = true; break; default: /* not reached */ WARN_ON(1); break; } } } conf.changed = changed; return local->ops->config_interface(local_to_hw(local), &sdata->vif, &conf); } int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) { struct ieee80211_channel *chan; int ret = 0; int power; enum nl80211_channel_type channel_type; might_sleep(); if (local->sw_scanning) { chan = local->scan_channel; channel_type = NL80211_CHAN_NO_HT; } else { chan = local->oper_channel; channel_type = local->oper_channel_type; } if (chan != local->hw.conf.channel || channel_type != local->hw.conf.channel_type) { local->hw.conf.channel = chan; local->hw.conf.channel_type = channel_type; changed |= IEEE80211_CONF_CHANGE_CHANNEL; } if (local->sw_scanning) power = chan->max_power; else power = local->power_constr_level ? (chan->max_power - local->power_constr_level) : chan->max_power; if (local->user_power_level >= 0) power = min(power, local->user_power_level); if (local->hw.conf.power_level != power) { changed |= IEEE80211_CONF_CHANGE_POWER; local->hw.conf.power_level = power; } if (changed && local->open_count) { ret = local->ops->config(local_to_hw(local), changed); /* * Goal: * HW reconfiguration should never fail, the driver has told * us what it can support so it should live up to that promise. * * Current status: * rfkill is not integrated with mac80211 and a * configuration command can thus fail if hardware rfkill * is enabled * * FIXME: integrate rfkill with mac80211 and then add this * WARN_ON() back * */ /* WARN_ON(ret); */ } return ret; } void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, u32 changed) { struct ieee80211_local *local = sdata->local; if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) return; if (!changed) return; if (local->ops->bss_info_changed) local->ops->bss_info_changed(local_to_hw(local), &sdata->vif, &sdata->vif.bss_conf, changed); } u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata) { sdata->vif.bss_conf.use_cts_prot = false; sdata->vif.bss_conf.use_short_preamble = false; sdata->vif.bss_conf.use_short_slot = false; return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE | BSS_CHANGED_ERP_SLOT; } void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); int tmp; skb->dev = local->mdev; skb->pkt_type = IEEE80211_TX_STATUS_MSG; skb_queue_tail(info->flags & IEEE80211_TX_CTL_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))) { 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_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: skb->pkt_type = 0; ieee80211_tx_status(local_to_hw(local), skb); 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: WARN(1, "mac80211: Packet is of unknown type %d\n", 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. */ static void ieee80211_remove_tx_extra(struct ieee80211_local *local, struct ieee80211_key *key, struct sk_buff *skb) { unsigned int hdrlen, iv_len, mic_len; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; hdrlen = ieee80211_hdrlen(hdr->frame_control); 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 >= hdrlen + mic_len && !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) skb_trim(skb, skb->len - mic_len); if (skb->len >= hdrlen + iv_len) { memmove(skb->data + iv_len, skb->data, hdrlen); hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len); } no_key: if (ieee80211_is_data_qos(hdr->frame_control)) { hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data, hdrlen - IEEE80211_QOS_CTL_LEN); skb_pull(skb, IEEE80211_QOS_CTL_LEN); } } static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, struct sta_info *sta, struct sk_buff *skb) { 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 * when it wakes up for the next time. */ set_sta_flags(sta, 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 (test_sta_flags(sta, WLAN_STA_PS) && skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) { ieee80211_remove_tx_extra(local, sta->key, skb); skb_queue_tail(&sta->tx_filtered, skb); return; } if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) { /* Software retry the packet once */ skb->requeue = 1; ieee80211_remove_tx_extra(local, sta->key, skb); dev_queue_xmit(skb); return; } #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 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), !!test_sta_flags(sta, WLAN_STA_PS), jiffies); #endif dev_kfree_skb(skb); } void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) { struct sk_buff *skb2; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); u16 frag, type; __le16 fc; struct ieee80211_supported_band *sband; struct ieee80211_tx_status_rtap_hdr *rthdr; struct ieee80211_sub_if_data *sdata; struct net_device *prev_dev = NULL; struct sta_info *sta; int retry_count = -1, i; for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { /* the HW cannot have attempted that rate */ if (i >= hw->max_rates) { info->status.rates[i].idx = -1; info->status.rates[i].count = 0; } retry_count += info->status.rates[i].count; } if (retry_count < 0) retry_count = 0; rcu_read_lock(); sband = local->hw.wiphy->bands[info->band]; sta = sta_info_get(local, hdr->addr1); if (sta) { if (!(info->flags & IEEE80211_TX_STAT_ACK) && test_sta_flags(sta, WLAN_STA_PS)) { /* * The STA is in power save mode, so assume * that this TX packet failed because of that. */ ieee80211_handle_filtered_frame(local, sta, skb); rcu_read_unlock(); return; } fc = hdr->frame_control; if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && (ieee80211_is_data_qos(fc))) { u16 tid, ssn; u8 *qc; qc = ieee80211_get_qos_ctl(hdr); tid = qc[0] & 0xf; ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) & IEEE80211_SCTL_SEQ); ieee80211_send_bar(sta->sdata, hdr->addr1, tid, ssn); } if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { ieee80211_handle_filtered_frame(local, sta, skb); rcu_read_unlock(); return; } else { if (!(info->flags & IEEE80211_TX_STAT_ACK)) sta->tx_retry_failed++; sta->tx_retry_count += retry_count; } rate_control_tx_status(local, sband, sta, skb); } rcu_read_unlock(); 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 (info->flags & IEEE80211_TX_STAT_ACK) { if (frag == 0) { local->dot11TransmittedFrameCount++; if (is_multicast_ether_addr(hdr->addr1)) local->dot11MulticastTransmittedFrameCount++; if (retry_count > 0) local->dot11RetryCount++; if (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) | (1 << IEEE80211_RADIOTAP_RATE)); if (!(info->flags & IEEE80211_TX_STAT_ACK) && !is_multicast_ether_addr(hdr->addr1)) rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL); /* * XXX: Once radiotap gets the bitmap reset thing the vendor * extensions proposal contains, we can actually report * the whole set of tries we did. */ if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS); else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS); if (info->status.rates[0].idx >= 0 && !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) rthdr->rate = sband->bitrates[ info->status.rates[0].idx].bitrate / 5; /* for now report the total retry_count */ rthdr->data_retries = 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 == NL80211_IFTYPE_MONITOR) { 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); static void ieee80211_restart_work(struct work_struct *work) { struct ieee80211_local *local = container_of(work, struct ieee80211_local, restart_work); rtnl_lock(); ieee80211_reconfig(local); rtnl_unlock(); } void ieee80211_restart_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); /* use this reason, __ieee80211_resume will unblock it */ ieee80211_stop_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_SUSPEND); schedule_work(&local->restart_work); } EXPORT_SYMBOL(ieee80211_restart_hw); struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len, const struct ieee80211_ops *ops) { struct ieee80211_local *local; int priv_size, i; 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; /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */ wiphy->bss_priv_size = sizeof(struct ieee80211_bss) - sizeof(struct cfg80211_bss); 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; /* set up some defaults */ local->hw.queues = 1; local->hw.max_rates = 1; local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; local->hw.conf.radio_enabled = true; INIT_LIST_HEAD(&local->interfaces); mutex_init(&local->iflist_mtx); spin_lock_init(&local->key_lock); spin_lock_init(&local->queue_stop_reason_lock); INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); INIT_WORK(&local->restart_work, ieee80211_restart_work); INIT_WORK(&local->dynamic_ps_enable_work, ieee80211_dynamic_ps_enable_work); INIT_WORK(&local->dynamic_ps_disable_work, ieee80211_dynamic_ps_disable_work); setup_timer(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, (unsigned long) local); sta_info_init(local); for (i = 0; i < IEEE80211_MAX_QUEUES; i++) skb_queue_head_init(&local->pending[i]); 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); spin_lock_init(&local->ampdu_lock); return local_to_hw(local); } EXPORT_SYMBOL(ieee80211_alloc_hw); static const struct net_device_ops ieee80211_master_ops = { .ndo_start_xmit = ieee80211_master_start_xmit, .ndo_open = ieee80211_master_open, .ndo_stop = ieee80211_master_stop, .ndo_set_multicast_list = ieee80211_master_set_multicast_list, .ndo_select_queue = ieee80211_select_queue, }; static void ieee80211_master_setup(struct net_device *mdev) { mdev->type = ARPHRD_IEEE80211; mdev->netdev_ops = &ieee80211_master_ops; mdev->header_ops = &ieee80211_header_ops; mdev->tx_queue_len = 1000; mdev->addr_len = ETH_ALEN; } int ieee80211_register_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); int result; enum ieee80211_band band; struct net_device *mdev; struct ieee80211_master_priv *mpriv; int channels, i, j, max_bitrates; bool supp_ht; static const u32 cipher_suites[] = { WLAN_CIPHER_SUITE_WEP40, WLAN_CIPHER_SUITE_WEP104, WLAN_CIPHER_SUITE_TKIP, WLAN_CIPHER_SUITE_CCMP, /* keep last -- depends on hw flags! */ WLAN_CIPHER_SUITE_AES_CMAC }; /* * generic code guarantees at least one band, * set this very early because much code assumes * that hw.conf.channel is assigned */ channels = 0; max_bitrates = 0; supp_ht = false; for (band = 0; band < IEEE80211_NUM_BANDS; band++) { struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[band]; if (!sband) continue; if (!local->oper_channel) { /* init channel we're on */ local->hw.conf.channel = local->oper_channel = local->scan_channel = &sband->channels[0]; } channels += sband->n_channels; if (max_bitrates < sband->n_bitrates) max_bitrates = sband->n_bitrates; supp_ht = supp_ht || sband->ht_cap.ht_supported; } local->int_scan_req.n_channels = channels; local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL); if (!local->int_scan_req.channels) return -ENOMEM; /* if low-level driver supports AP, we also support VLAN */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); /* mac80211 always supports monitor */ local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; /* * Calculate scan IE length -- we need this to alloc * memory and to subtract from the driver limit. It * includes the (extended) supported rates and HT * information -- SSID is the driver's responsibility. */ local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */ if (supp_ht) local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); if (!local->ops->hw_scan) { /* For hw_scan, driver needs to set these up. */ local->hw.wiphy->max_scan_ssids = 4; local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN; } /* * If the driver supports any scan IEs, then assume the * limit includes the IEs mac80211 will add, otherwise * leave it at zero and let the driver sort it out; we * still pass our IEs to the driver but userspace will * not be allowed to in that case. */ if (local->hw.wiphy->max_scan_ie_len) local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; local->hw.wiphy->cipher_suites = cipher_suites; local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE)) local->hw.wiphy->n_cipher_suites--; result = wiphy_register(local->hw.wiphy); if (result < 0) goto fail_wiphy_register; /* * We use the number of queues for feature tests (QoS, HT) internally * so restrict them appropriately. */ if (hw->queues > IEEE80211_MAX_QUEUES) hw->queues = IEEE80211_MAX_QUEUES; mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv), "wmaster%d", ieee80211_master_setup, hw->queues); if (!mdev) goto fail_mdev_alloc; mpriv = netdev_priv(mdev); mpriv->local = local; local->mdev = mdev; local->hw.workqueue = create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); 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); if (local->hw.conf.beacon_int < 10) local->hw.conf.beacon_int = 100; if (local->hw.max_listen_interval == 0) local->hw.max_listen_interval = 1; local->hw.conf.listen_interval = local->hw.max_listen_interval; 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)); local->mdev->features |= NETIF_F_NETNS_LOCAL; result = register_netdevice(local->mdev); if (result < 0) goto fail_dev; 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: %d\n", wiphy_name(local->hw.wiphy), result); goto fail_wep; } /* add one default STA interface if supported */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) { result = ieee80211_if_add(local, "wlan%d", NULL, NL80211_IFTYPE_STATION, NULL); if (result) printk(KERN_WARNING "%s: Failed to add default virtual iface\n", wiphy_name(local->hw.wiphy)); } rtnl_unlock(); ieee80211_led_init(local); /* alloc internal scan request */ i = 0; local->int_scan_req.ssids = &local->scan_ssid; local->int_scan_req.n_ssids = 1; for (band = 0; band < IEEE80211_NUM_BANDS; band++) { if (!hw->wiphy->bands[band]) continue; for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) { local->int_scan_req.channels[i] = &hw->wiphy->bands[band]->channels[j]; i++; } } local->network_latency_notifier.notifier_call = ieee80211_max_network_latency; result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY, &local->network_latency_notifier); if (result) { rtnl_lock(); goto fail_pm_qos; } return 0; fail_pm_qos: ieee80211_led_exit(local); ieee80211_remove_interfaces(local); fail_wep: rate_control_deinitialize(local); fail_rate: unregister_netdevice(local->mdev); local->mdev = NULL; fail_dev: rtnl_unlock(); sta_info_stop(local); fail_sta_info: debugfs_hw_del(local); destroy_workqueue(local->hw.workqueue); fail_workqueue: if (local->mdev) free_netdev(local->mdev); fail_mdev_alloc: wiphy_unregister(local->hw.wiphy); fail_wiphy_register: kfree(local->int_scan_req.channels); return result; } EXPORT_SYMBOL(ieee80211_register_hw); void ieee80211_unregister_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); tasklet_kill(&local->tx_pending_tasklet); tasklet_kill(&local->tasklet); pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, &local->network_latency_notifier); rtnl_lock(); /* * 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 virtual interfaces. */ ieee80211_remove_interfaces(local); /* then, finally, remove the master interface */ unregister_netdevice(local->mdev); rtnl_unlock(); 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); free_netdev(local->mdev); kfree(local->int_scan_req.channels); } EXPORT_SYMBOL(ieee80211_unregister_hw); void ieee80211_free_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); mutex_destroy(&local->iflist_mtx); 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_info) > sizeof(skb->cb)); BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) + IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb)); ret = rc80211_minstrel_init(); if (ret) return ret; ret = rc80211_pid_init(); if (ret) return ret; ieee80211_debugfs_netdev_init(); return 0; } static void __exit ieee80211_exit(void) { rc80211_pid_exit(); rc80211_minstrel_exit(); /* * For key todo, it'll be empty by now but the work * might still be scheduled. */ flush_scheduled_work(); if (mesh_allocated) ieee80211s_stop(); ieee80211_debugfs_netdev_exit(); } subsys_initcall(ieee80211_init); module_exit(ieee80211_exit); MODULE_DESCRIPTION("IEEE 802.11 subsystem"); MODULE_LICENSE("GPL");