/* * 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 <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/rtnetlink.h> #include <linux/bitmap.h> #include <linux/pm_qos_params.h> #include <linux/inetdevice.h> #include <net/net_namespace.h> #include <net/cfg80211.h> #include "ieee80211_i.h" #include "driver-ops.h" #include "rate.h" #include "mesh.h" #include "wep.h" #include "led.h" #include "cfg.h" #include "debugfs.h" bool ieee80211_disable_40mhz_24ghz; module_param(ieee80211_disable_40mhz_24ghz, bool, 0644); MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz, "Disable 40MHz support in the 2.4GHz band"); void ieee80211_configure_filter(struct ieee80211_local *local) { u64 mc; 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 || local->scanning) 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; if (local->fif_pspoll) new_flags |= FIF_PSPOLL; spin_lock_bh(&local->filter_lock); changed_flags = local->filter_flags ^ new_flags; mc = drv_prepare_multicast(local, &local->mc_list); spin_unlock_bh(&local->filter_lock); /* be a bit nasty */ new_flags |= (1<<31); drv_configure_filter(local, changed_flags, &new_flags, mc); WARN_ON(new_flags & (1<<31)); local->filter_flags = new_flags & ~(1<<31); } static void ieee80211_reconfig_filter(struct work_struct *work) { struct ieee80211_local *local = container_of(work, struct ieee80211_local, reconfig_filter); ieee80211_configure_filter(local); } int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) { struct ieee80211_channel *chan, *scan_chan; int ret = 0; int power; enum nl80211_channel_type channel_type; might_sleep(); scan_chan = local->scan_channel; if (scan_chan) { chan = scan_chan; channel_type = NL80211_CHAN_NO_HT; } else if (local->tmp_channel) { chan = scan_chan = local->tmp_channel; channel_type = local->tmp_channel_type; } 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 (!conf_is_ht(&local->hw.conf)) { /* * mac80211.h documents that this is only valid * when the channel is set to an HT type, and * that otherwise STATIC is used. */ local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC; } else if (local->hw.conf.smps_mode != local->smps_mode) { local->hw.conf.smps_mode = local->smps_mode; changed |= IEEE80211_CONF_CHANGE_SMPS; } if (scan_chan) 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 = drv_config(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; static const u8 zero[ETH_ALEN] = { 0 }; if (!changed) return; if (sdata->vif.type == NL80211_IFTYPE_STATION) { /* * While not associated, claim a BSSID of all-zeroes * so that drivers don't do any weird things with the * BSSID at that time. */ if (sdata->vif.bss_conf.assoc) sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid; else sdata->vif.bss_conf.bssid = zero; } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid; else if (sdata->vif.type == NL80211_IFTYPE_AP) sdata->vif.bss_conf.bssid = sdata->vif.addr; else if (ieee80211_vif_is_mesh(&sdata->vif)) { sdata->vif.bss_conf.bssid = zero; } else { WARN_ON(1); return; } 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 &= ~BSS_CHANGED_BEACON_ENABLED; if (WARN_ON(changed & BSS_CHANGED_BEACON)) return; break; } if (changed & BSS_CHANGED_BEACON_ENABLED) { if (local->quiescing || !ieee80211_sdata_running(sdata) || test_bit(SCAN_SW_SCANNING, &local->scanning)) { sdata->vif.bss_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: sdata->vif.bss_conf.enable_beacon = !!sdata->u.ap.beacon; break; case NL80211_IFTYPE_ADHOC: sdata->vif.bss_conf.enable_beacon = !!sdata->u.ibss.presp; break; case NL80211_IFTYPE_MESH_POINT: sdata->vif.bss_conf.enable_beacon = true; break; default: /* not reached */ WARN_ON(1); break; } } } drv_bss_info_changed(local, sdata, &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; } static void ieee80211_tasklet_handler(unsigned long data) { struct ieee80211_local *local = (struct ieee80211_local *) data; struct sk_buff *skb; while ((skb = skb_dequeue(&local->skb_queue)) || (skb = skb_dequeue(&local->skb_queue_unreliable))) { switch (skb->pkt_type) { case IEEE80211_RX_MSG: /* Clear skb->pkt_type in order to not confuse kernel * netstack. */ skb->pkt_type = 0; ieee80211_rx(local_to_hw(local), skb); break; case IEEE80211_TX_STATUS_MSG: skb->pkt_type = 0; ieee80211_tx_status(local_to_hw(local), skb); break; default: WARN(1, "mac80211: Packet is of unknown type %d\n", skb->pkt_type); dev_kfree_skb(skb); break; } } } 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); trace_api_restart_hw(local); /* 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); static void ieee80211_recalc_smps_work(struct work_struct *work) { struct ieee80211_local *local = container_of(work, struct ieee80211_local, recalc_smps); mutex_lock(&local->iflist_mtx); ieee80211_recalc_smps(local, NULL); mutex_unlock(&local->iflist_mtx); } #ifdef CONFIG_INET static int ieee80211_ifa_changed(struct notifier_block *nb, unsigned long data, void *arg) { struct in_ifaddr *ifa = arg; struct ieee80211_local *local = container_of(nb, struct ieee80211_local, ifa_notifier); struct net_device *ndev = ifa->ifa_dev->dev; struct wireless_dev *wdev = ndev->ieee80211_ptr; struct in_device *idev; struct ieee80211_sub_if_data *sdata; struct ieee80211_bss_conf *bss_conf; struct ieee80211_if_managed *ifmgd; int c = 0; if (!netif_running(ndev)) return NOTIFY_DONE; /* Make sure it's our interface that got changed */ if (!wdev) return NOTIFY_DONE; if (wdev->wiphy != local->hw.wiphy) return NOTIFY_DONE; sdata = IEEE80211_DEV_TO_SUB_IF(ndev); bss_conf = &sdata->vif.bss_conf; /* ARP filtering is only supported in managed mode */ if (sdata->vif.type != NL80211_IFTYPE_STATION) return NOTIFY_DONE; idev = sdata->dev->ip_ptr; if (!idev) return NOTIFY_DONE; ifmgd = &sdata->u.mgd; mutex_lock(&ifmgd->mtx); /* Copy the addresses to the bss_conf list */ ifa = idev->ifa_list; while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) { bss_conf->arp_addr_list[c] = ifa->ifa_address; ifa = ifa->ifa_next; c++; } /* If not all addresses fit the list, disable filtering */ if (ifa) { sdata->arp_filter_state = false; c = 0; } else { sdata->arp_filter_state = true; } bss_conf->arp_addr_cnt = c; /* Configure driver only if associated */ if (ifmgd->associated) { bss_conf->arp_filter_enabled = sdata->arp_filter_state; ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_ARP_FILTER); } mutex_unlock(&ifmgd->mtx); return NOTIFY_DONE; } #endif 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 = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; wiphy = wiphy_new(&mac80211_config_ops, priv_size); if (!wiphy) return NULL; wiphy->flags |= WIPHY_FLAG_NETNS_OK | WIPHY_FLAG_4ADDR_AP | WIPHY_FLAG_4ADDR_STATION; wiphy->privid = mac80211_wiphy_privid; wiphy->bss_priv_size = sizeof(struct ieee80211_bss); local = wiphy_priv(wiphy); local->hw.wiphy = wiphy; local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 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->user_power_level = -1; local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; INIT_LIST_HEAD(&local->interfaces); __hw_addr_init(&local->mc_list); mutex_init(&local->iflist_mtx); mutex_init(&local->scan_mtx); mutex_init(&local->key_mtx); spin_lock_init(&local->filter_lock); spin_lock_init(&local->queue_stop_reason_lock); INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); ieee80211_work_init(local); INIT_WORK(&local->restart_work, ieee80211_restart_work); INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work); local->smps_mode = IEEE80211_SMPS_OFF; 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]); atomic_set(&local->agg_queue_stop[i], 0); } tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending, (unsigned long)local); tasklet_init(&local->tasklet, ieee80211_tasklet_handler, (unsigned long) local); 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); int result; enum ieee80211_band band; int channels, 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 = &sband->channels[0]; local->hw.conf.channel_type = NL80211_CHAN_NO_HT; } 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 = kzalloc(sizeof(*local->int_scan_req) + sizeof(void *) * channels, GFP_KERNEL); if (!local->int_scan_req) 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; WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK), "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"); /* * 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; local->workqueue = create_singlethread_workqueue(wiphy_name(local->hw.wiphy)); if (!local->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. */ BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM != sizeof(struct ieee80211_tx_status_rtap_hdr)); local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, sizeof(struct ieee80211_tx_status_rtap_hdr)); debugfs_hw_add(local); /* * if the driver doesn't specify a max listen interval we * use 5 which should be a safe default */ if (local->hw.max_listen_interval == 0) local->hw.max_listen_interval = 5; local->hw.conf.listen_interval = local->hw.max_listen_interval; local->dynamic_ps_forced_timeout = -1; result = sta_info_start(local); if (result < 0) goto fail_sta_info; 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; } rtnl_lock(); 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; } /* 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); 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; } #ifdef CONFIG_INET local->ifa_notifier.notifier_call = ieee80211_ifa_changed; result = register_inetaddr_notifier(&local->ifa_notifier); if (result) goto fail_ifa; #endif return 0; fail_ifa: pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY, &local->network_latency_notifier); rtnl_lock(); fail_pm_qos: ieee80211_led_exit(local); ieee80211_remove_interfaces(local); fail_rate: rtnl_unlock(); ieee80211_wep_free(local); fail_wep: sta_info_stop(local); fail_sta_info: destroy_workqueue(local->workqueue); fail_workqueue: wiphy_unregister(local->hw.wiphy); fail_wiphy_register: kfree(local->int_scan_req); 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); #ifdef CONFIG_INET unregister_inetaddr_notifier(&local->ifa_notifier); #endif 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. */ ieee80211_remove_interfaces(local); rtnl_unlock(); cancel_work_sync(&local->reconfig_filter); ieee80211_clear_tx_pending(local); sta_info_stop(local); rate_control_deinitialize(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->workqueue); wiphy_unregister(local->hw.wiphy); ieee80211_wep_free(local); ieee80211_led_exit(local); kfree(local->int_scan_req); } 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); mutex_destroy(&local->scan_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_minstrel_ht_init(); if (ret) goto err_minstrel; ret = rc80211_pid_init(); if (ret) goto err_pid; ret = ieee80211_iface_init(); if (ret) goto err_netdev; return 0; err_netdev: rc80211_pid_exit(); err_pid: rc80211_minstrel_ht_exit(); err_minstrel: rc80211_minstrel_exit(); return ret; } static void __exit ieee80211_exit(void) { rc80211_pid_exit(); rc80211_minstrel_ht_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_iface_exit(); } subsys_initcall(ieee80211_init); module_exit(ieee80211_exit); MODULE_DESCRIPTION("IEEE 802.11 subsystem"); MODULE_LICENSE("GPL");