// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2013-2014 Intel Mobile Communications GmbH * Copyright (C) 2017 Intel Deutschland GmbH * Copyright (C) 2018 - 2019 Intel Corporation */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "driver-ops.h" #include "rate.h" #include "mesh.h" #include "wep.h" #include "led.h" #include "debugfs.h" void ieee80211_configure_filter(struct ieee80211_local *local) { u64 mc; unsigned int changed_flags; unsigned int new_flags = 0; if (atomic_read(&local->iff_allmultis)) new_flags |= FIF_ALLMULTI; if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) || test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) new_flags |= FIF_BCN_PRBRESP_PROMISC; if (local->fif_probe_req || local->probe_req_reg) new_flags |= FIF_PROBE_REQ; 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; if (local->rx_mcast_action_reg) new_flags |= FIF_MCAST_ACTION; 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); } static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; struct cfg80211_chan_def chandef = {}; u32 changed = 0; int power; u32 offchannel_flag; offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; if (local->scan_chandef.chan) { chandef = local->scan_chandef; } else if (local->tmp_channel) { chandef.chan = local->tmp_channel; chandef.width = NL80211_CHAN_WIDTH_20_NOHT; chandef.center_freq1 = chandef.chan->center_freq; chandef.freq1_offset = chandef.chan->freq_offset; } else chandef = local->_oper_chandef; WARN(!cfg80211_chandef_valid(&chandef), "control:%d.%03d MHz width:%d center: %d.%03d/%d MHz", chandef.chan->center_freq, chandef.chan->freq_offset, chandef.width, chandef.center_freq1, chandef.freq1_offset, chandef.center_freq2); if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef)) local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; else local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; if (offchannel_flag || !cfg80211_chandef_identical(&local->hw.conf.chandef, &local->_oper_chandef)) { local->hw.conf.chandef = chandef; 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; } power = ieee80211_chandef_max_power(&chandef); rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) { if (!rcu_access_pointer(sdata->vif.chanctx_conf)) continue; if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) continue; if (sdata->vif.bss_conf.txpower == INT_MIN) continue; power = min(power, sdata->vif.bss_conf.txpower); } rcu_read_unlock(); if (local->hw.conf.power_level != power) { changed |= IEEE80211_CONF_CHANGE_POWER; local->hw.conf.power_level = power; } return changed; } int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) { int ret = 0; might_sleep(); if (!local->use_chanctx) changed |= ieee80211_hw_conf_chan(local); else changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL | IEEE80211_CONF_CHANGE_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; if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN) return; 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(struct tasklet_struct *t) { struct ieee80211_local *local = from_tasklet(local, t, tasklet); 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->hw, skb); break; case IEEE80211_TX_STATUS_MSG: skb->pkt_type = 0; ieee80211_tx_status(&local->hw, 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); struct ieee80211_sub_if_data *sdata; /* wait for scan work complete */ flush_workqueue(local->workqueue); flush_work(&local->sched_scan_stopped_work); WARN(test_bit(SCAN_HW_SCANNING, &local->scanning), "%s called with hardware scan in progress\n", __func__); flush_work(&local->radar_detected_work); rtnl_lock(); list_for_each_entry(sdata, &local->interfaces, list) { /* * XXX: there may be more work for other vif types and even * for station mode: a good thing would be to run most of * the iface type's dependent _stop (ieee80211_mg_stop, * ieee80211_ibss_stop) etc... * For now, fix only the specific bug that was seen: race * between csa_connection_drop_work and us. */ if (sdata->vif.type == NL80211_IFTYPE_STATION) { /* * This worker is scheduled from the iface worker that * runs on mac80211's workqueue, so we can't be * scheduling this worker after the cancel right here. * The exception is ieee80211_chswitch_done. * Then we can have a race... */ cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work); } flush_delayed_work(&sdata->dec_tailroom_needed_wk); } ieee80211_scan_cancel(local); /* make sure any new ROC will consider local->in_reconfig */ flush_delayed_work(&local->roc_work); flush_work(&local->hw_roc_done); /* wait for all packet processing to be done */ synchronize_net(); 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); wiphy_info(hw->wiphy, "Hardware restart was requested\n"); /* use this reason, ieee80211_reconfig will unblock it */ ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_SUSPEND, false); /* * Stop all Rx during the reconfig. We don't want state changes * or driver callbacks while this is in progress. */ local->in_reconfig = true; barrier(); queue_work(system_freezable_wq, &local->restart_work); } EXPORT_SYMBOL(ieee80211_restart_hw); #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; /* 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 = __in_dev_get_rtnl(sdata->dev); if (!idev) return NOTIFY_DONE; ifmgd = &sdata->u.mgd; sdata_lock(sdata); /* Copy the addresses to the bss_conf list */ ifa = rtnl_dereference(idev->ifa_list); while (ifa) { if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN) bss_conf->arp_addr_list[c] = ifa->ifa_address; ifa = rtnl_dereference(ifa->ifa_next); c++; } bss_conf->arp_addr_cnt = c; /* Configure driver only if associated (which also implies it is up) */ if (ifmgd->associated) ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_ARP_FILTER); sdata_unlock(sdata); return NOTIFY_OK; } #endif #if IS_ENABLED(CONFIG_IPV6) static int ieee80211_ifa6_changed(struct notifier_block *nb, unsigned long data, void *arg) { struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg; struct inet6_dev *idev = ifa->idev; struct net_device *ndev = ifa->idev->dev; struct ieee80211_local *local = container_of(nb, struct ieee80211_local, ifa6_notifier); struct wireless_dev *wdev = ndev->ieee80211_ptr; struct ieee80211_sub_if_data *sdata; /* Make sure it's our interface that got changed */ if (!wdev || wdev->wiphy != local->hw.wiphy) return NOTIFY_DONE; sdata = IEEE80211_DEV_TO_SUB_IF(ndev); /* * For now only support station mode. This is mostly because * doing AP would have to handle AP_VLAN in some way ... */ if (sdata->vif.type != NL80211_IFTYPE_STATION) return NOTIFY_DONE; drv_ipv6_addr_change(local, sdata, idev); return NOTIFY_OK; } #endif /* There isn't a lot of sense in it, but you can transmit anything you like */ static const struct ieee80211_txrx_stypes ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = { [NL80211_IFTYPE_ADHOC] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_DEAUTH >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4), }, [NL80211_IFTYPE_STATION] = { .tx = 0xffff, /* * To support Pre Association Security Negotiation (PASN) while * already associated to one AP, allow user space to register to * Rx authentication frames, so that the user space logic would * be able to receive/handle authentication frames from a * different AP as part of PASN. * It is expected that user space would intelligently register * for Rx authentication frames, i.e., only when PASN is used * and configure a match filter only for PASN authentication * algorithm, as otherwise the MLME functionality of mac80211 * would be broken. */ .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4), }, [NL80211_IFTYPE_AP] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | BIT(IEEE80211_STYPE_DISASSOC >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_DEAUTH >> 4) | BIT(IEEE80211_STYPE_ACTION >> 4), }, [NL80211_IFTYPE_AP_VLAN] = { /* copy AP */ .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | BIT(IEEE80211_STYPE_DISASSOC >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_DEAUTH >> 4) | BIT(IEEE80211_STYPE_ACTION >> 4), }, [NL80211_IFTYPE_P2P_CLIENT] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4), }, [NL80211_IFTYPE_P2P_GO] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4) | BIT(IEEE80211_STYPE_DISASSOC >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_DEAUTH >> 4) | BIT(IEEE80211_STYPE_ACTION >> 4), }, [NL80211_IFTYPE_MESH_POINT] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | BIT(IEEE80211_STYPE_AUTH >> 4) | BIT(IEEE80211_STYPE_DEAUTH >> 4), }, [NL80211_IFTYPE_P2P_DEVICE] = { .tx = 0xffff, .rx = BIT(IEEE80211_STYPE_ACTION >> 4) | BIT(IEEE80211_STYPE_PROBE_REQ >> 4), }, }; static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = { .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR | IEEE80211_HT_AMPDU_PARM_DENSITY, .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 | IEEE80211_HT_CAP_MAX_AMSDU | IEEE80211_HT_CAP_SGI_20 | IEEE80211_HT_CAP_SGI_40 | IEEE80211_HT_CAP_TX_STBC | IEEE80211_HT_CAP_RX_STBC | IEEE80211_HT_CAP_LDPC_CODING | IEEE80211_HT_CAP_40MHZ_INTOLERANT), .mcs = { .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, }, }, }; static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = { .vht_cap_info = cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC | IEEE80211_VHT_CAP_SHORT_GI_80 | IEEE80211_VHT_CAP_SHORT_GI_160 | IEEE80211_VHT_CAP_RXSTBC_MASK | IEEE80211_VHT_CAP_TXSTBC | IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE | IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN | IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK), .supp_mcs = { .rx_mcs_map = cpu_to_le16(~0), .tx_mcs_map = cpu_to_le16(~0), }, }; struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len, const struct ieee80211_ops *ops, const char *requested_name) { struct ieee80211_local *local; int priv_size, i; struct wiphy *wiphy; bool use_chanctx; if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config || !ops->add_interface || !ops->remove_interface || !ops->configure_filter)) return NULL; if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove))) return NULL; /* check all or no channel context operations exist */ i = !!ops->add_chanctx + !!ops->remove_chanctx + !!ops->change_chanctx + !!ops->assign_vif_chanctx + !!ops->unassign_vif_chanctx; if (WARN_ON(i != 0 && i != 5)) return NULL; use_chanctx = i == 5; /* 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_nm(&mac80211_config_ops, priv_size, requested_name); if (!wiphy) return NULL; wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes; wiphy->privid = mac80211_wiphy_privid; wiphy->flags |= WIPHY_FLAG_NETNS_OK | WIPHY_FLAG_4ADDR_AP | WIPHY_FLAG_4ADDR_STATION | WIPHY_FLAG_REPORTS_OBSS | WIPHY_FLAG_OFFCHAN_TX; if (!use_chanctx || ops->remain_on_channel) wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL; wiphy->features |= NL80211_FEATURE_SK_TX_STATUS | NL80211_FEATURE_SAE | NL80211_FEATURE_HT_IBSS | NL80211_FEATURE_VIF_TXPOWER | NL80211_FEATURE_MAC_ON_CREATE | NL80211_FEATURE_USERSPACE_MPM | NL80211_FEATURE_FULL_AP_CLIENT_STATE; wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CONTROL_PORT_NO_PREAUTH); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211_TX_STATUS); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_SCAN_FREQ_KHZ); if (!ops->hw_scan) { wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN | NL80211_FEATURE_AP_SCAN; /* * if the driver behaves correctly using the probe request * (template) from mac80211, then both of these should be * supported even with hw scan - but let drivers opt in. */ wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_SCAN_RANDOM_SN); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT); } if (!ops->set_key) wiphy->flags |= WIPHY_FLAG_IBSS_RSN; if (ops->wake_tx_queue) wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_TXQS); wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM); wiphy->bss_priv_size = sizeof(struct ieee80211_bss); local = wiphy_priv(wiphy); if (sta_info_init(local)) goto err_free; local->hw.wiphy = wiphy; local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); local->ops = ops; local->use_chanctx = use_chanctx; /* * We need a bit of data queued to build aggregates properly, so * instruct the TCP stack to allow more than a single ms of data * to be queued in the stack. The value is a bit-shift of 1 * second, so 7 is ~8ms of queued data. Only affects local TCP * sockets. * This is the default, anyhow - drivers may need to override it * for local reasons (longer buffers, longer completion time, or * similar). */ local->hw.tx_sk_pacing_shift = 7; /* set up some defaults */ local->hw.queues = 1; local->hw.max_rates = 1; local->hw.max_report_rates = 0; local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT; local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF_HT; local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE; local->hw.conf.long_frame_max_tx_count = wiphy->retry_long; local->hw.conf.short_frame_max_tx_count = wiphy->retry_short; local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS | IEEE80211_RADIOTAP_MCS_HAVE_GI | IEEE80211_RADIOTAP_MCS_HAVE_BW; local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; local->hw.max_mtu = IEEE80211_MAX_DATA_LEN; local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask; wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask; local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF; wiphy->extended_capabilities = local->ext_capa; wiphy->extended_capabilities_mask = local->ext_capa; wiphy->extended_capabilities_len = ARRAY_SIZE(local->ext_capa); INIT_LIST_HEAD(&local->interfaces); INIT_LIST_HEAD(&local->mon_list); __hw_addr_init(&local->mc_list); mutex_init(&local->iflist_mtx); mutex_init(&local->mtx); mutex_init(&local->key_mtx); spin_lock_init(&local->filter_lock); spin_lock_init(&local->rx_path_lock); spin_lock_init(&local->queue_stop_reason_lock); for (i = 0; i < IEEE80211_NUM_ACS; i++) { INIT_LIST_HEAD(&local->active_txqs[i]); spin_lock_init(&local->active_txq_lock[i]); local->aql_txq_limit_low[i] = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_L; local->aql_txq_limit_high[i] = IEEE80211_DEFAULT_AQL_TXQ_LIMIT_H; } local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX; local->aql_threshold = IEEE80211_AQL_THRESHOLD; atomic_set(&local->aql_total_pending_airtime, 0); INIT_LIST_HEAD(&local->chanctx_list); mutex_init(&local->chanctx_mtx); INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work); INIT_WORK(&local->restart_work, ieee80211_restart_work); INIT_WORK(&local->radar_detected_work, ieee80211_dfs_radar_detected_work); INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter); 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); timer_setup(&local->dynamic_ps_timer, ieee80211_dynamic_ps_timer, 0); INIT_WORK(&local->sched_scan_stopped_work, ieee80211_sched_scan_stopped_work); INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work); spin_lock_init(&local->ack_status_lock); idr_init(&local->ack_status_frames); for (i = 0; i < IEEE80211_MAX_QUEUES; i++) { skb_queue_head_init(&local->pending[i]); atomic_set(&local->agg_queue_stop[i], 0); } tasklet_setup(&local->tx_pending_tasklet, ieee80211_tx_pending); if (ops->wake_tx_queue) tasklet_setup(&local->wake_txqs_tasklet, ieee80211_wake_txqs); tasklet_setup(&local->tasklet, ieee80211_tasklet_handler); skb_queue_head_init(&local->skb_queue); skb_queue_head_init(&local->skb_queue_unreliable); skb_queue_head_init(&local->skb_queue_tdls_chsw); ieee80211_alloc_led_names(local); ieee80211_roc_setup(local); local->hw.radiotap_timestamp.units_pos = -1; local->hw.radiotap_timestamp.accuracy = -1; return &local->hw; err_free: wiphy_free(wiphy); return NULL; } EXPORT_SYMBOL(ieee80211_alloc_hw_nm); static int ieee80211_init_cipher_suites(struct ieee80211_local *local) { bool have_wep = !fips_enabled; /* FIPS does not permit the use of RC4 */ bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE); int n_suites = 0, r = 0, w = 0; u32 *suites; static const u32 cipher_suites[] = { /* keep WEP first, it may be removed below */ WLAN_CIPHER_SUITE_WEP40, WLAN_CIPHER_SUITE_WEP104, WLAN_CIPHER_SUITE_TKIP, WLAN_CIPHER_SUITE_CCMP, WLAN_CIPHER_SUITE_CCMP_256, WLAN_CIPHER_SUITE_GCMP, WLAN_CIPHER_SUITE_GCMP_256, /* keep last -- depends on hw flags! */ WLAN_CIPHER_SUITE_AES_CMAC, WLAN_CIPHER_SUITE_BIP_CMAC_256, WLAN_CIPHER_SUITE_BIP_GMAC_128, WLAN_CIPHER_SUITE_BIP_GMAC_256, }; if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) || local->hw.wiphy->cipher_suites) { /* If the driver advertises, or doesn't support SW crypto, * we only need to remove WEP if necessary. */ if (have_wep) return 0; /* well if it has _no_ ciphers ... fine */ if (!local->hw.wiphy->n_cipher_suites) return 0; /* Driver provides cipher suites, but we need to exclude WEP */ suites = kmemdup(local->hw.wiphy->cipher_suites, sizeof(u32) * local->hw.wiphy->n_cipher_suites, GFP_KERNEL); if (!suites) return -ENOMEM; for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) { u32 suite = local->hw.wiphy->cipher_suites[r]; if (suite == WLAN_CIPHER_SUITE_WEP40 || suite == WLAN_CIPHER_SUITE_WEP104) continue; suites[w++] = suite; } } else if (!local->hw.cipher_schemes) { /* If the driver doesn't have cipher schemes, there's nothing * else to do other than assign the (software supported and * perhaps offloaded) cipher suites. */ local->hw.wiphy->cipher_suites = cipher_suites; local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites); if (!have_mfp) local->hw.wiphy->n_cipher_suites -= 4; if (!have_wep) { local->hw.wiphy->cipher_suites += 2; local->hw.wiphy->n_cipher_suites -= 2; } /* not dynamically allocated, so just return */ return 0; } else { const struct ieee80211_cipher_scheme *cs; cs = local->hw.cipher_schemes; /* Driver specifies cipher schemes only (but not cipher suites * including the schemes) * * We start counting ciphers defined by schemes, TKIP, CCMP, * CCMP-256, GCMP, and GCMP-256 */ n_suites = local->hw.n_cipher_schemes + 5; /* check if we have WEP40 and WEP104 */ if (have_wep) n_suites += 2; /* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128, * BIP-GMAC-256 */ if (have_mfp) n_suites += 4; suites = kmalloc_array(n_suites, sizeof(u32), GFP_KERNEL); if (!suites) return -ENOMEM; suites[w++] = WLAN_CIPHER_SUITE_CCMP; suites[w++] = WLAN_CIPHER_SUITE_CCMP_256; suites[w++] = WLAN_CIPHER_SUITE_TKIP; suites[w++] = WLAN_CIPHER_SUITE_GCMP; suites[w++] = WLAN_CIPHER_SUITE_GCMP_256; if (have_wep) { suites[w++] = WLAN_CIPHER_SUITE_WEP40; suites[w++] = WLAN_CIPHER_SUITE_WEP104; } if (have_mfp) { suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC; suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256; suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128; suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256; } for (r = 0; r < local->hw.n_cipher_schemes; r++) { suites[w++] = cs[r].cipher; if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) { kfree(suites); return -EINVAL; } } } local->hw.wiphy->cipher_suites = suites; local->hw.wiphy->n_cipher_suites = w; local->wiphy_ciphers_allocated = true; return 0; } int ieee80211_register_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); int result, i; enum nl80211_band band; int channels, max_bitrates; bool supp_ht, supp_vht, supp_he; struct cfg80211_chan_def dflt_chandef = {}; if (ieee80211_hw_check(hw, QUEUE_CONTROL) && (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE || local->hw.offchannel_tx_hw_queue >= local->hw.queues)) return -EINVAL; if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && (!local->ops->tdls_channel_switch || !local->ops->tdls_cancel_channel_switch || !local->ops->tdls_recv_channel_switch)) return -EOPNOTSUPP; if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) && !local->ops->set_frag_threshold)) return -EINVAL; if (WARN_ON(local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN) && (!local->ops->start_nan || !local->ops->stop_nan))) return -EINVAL; #ifdef CONFIG_PM if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume)) return -EINVAL; #endif if (!local->use_chanctx) { for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { const struct ieee80211_iface_combination *comb; comb = &local->hw.wiphy->iface_combinations[i]; if (comb->num_different_channels > 1) return -EINVAL; } } else { /* * WDS is currently prohibited when channel contexts are used * because there's no clear definition of which channel WDS * type interfaces use */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)) return -EINVAL; /* DFS is not supported with multi-channel combinations yet */ for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) { const struct ieee80211_iface_combination *comb; comb = &local->hw.wiphy->iface_combinations[i]; if (comb->radar_detect_widths && comb->num_different_channels > 1) return -EINVAL; } } /* Only HW csum features are currently compatible with mac80211 */ if (WARN_ON(hw->netdev_features & ~MAC80211_SUPPORTED_FEATURES)) return -EINVAL; if (hw->max_report_rates == 0) hw->max_report_rates = hw->max_rates; local->rx_chains = 1; /* * 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; supp_vht = false; supp_he = false; for (band = 0; band < NUM_NL80211_BANDS; band++) { struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[band]; if (!sband) continue; if (!dflt_chandef.chan) { cfg80211_chandef_create(&dflt_chandef, &sband->channels[0], NL80211_CHAN_NO_HT); /* init channel we're on */ if (!local->use_chanctx && !local->_oper_chandef.chan) { local->hw.conf.chandef = dflt_chandef; local->_oper_chandef = dflt_chandef; } local->monitor_chandef = dflt_chandef; } channels += sband->n_channels; if (max_bitrates < sband->n_bitrates) max_bitrates = sband->n_bitrates; supp_ht = supp_ht || sband->ht_cap.ht_supported; supp_vht = supp_vht || sband->vht_cap.vht_supported; if (!supp_he) supp_he = !!ieee80211_get_he_sta_cap(sband); /* HT, VHT, HE require QoS, thus >= 4 queues */ if (WARN_ON(local->hw.queues < IEEE80211_NUM_ACS && (supp_ht || supp_vht || supp_he))) return -EINVAL; if (!sband->ht_cap.ht_supported) continue; /* TODO: consider VHT for RX chains, hopefully it's the same */ local->rx_chains = max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs), local->rx_chains); /* no need to mask, SM_PS_DISABLED has all bits set */ sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED << IEEE80211_HT_CAP_SM_PS_SHIFT; } /* if low-level driver supports AP, we also support VLAN. * drivers advertising SW_CRYPTO_CONTROL should enable AP_VLAN * based on their support to transmit SW encrypted packets. */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP) && !ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL)) { hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN); hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN); } /* mac80211 always supports monitor */ hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR); hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR); /* mac80211 doesn't support more than one IBSS interface right now */ for (i = 0; i < hw->wiphy->n_iface_combinations; i++) { const struct ieee80211_iface_combination *c; int j; c = &hw->wiphy->iface_combinations[i]; for (j = 0; j < c->n_limits; j++) if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) && c->limits[j].max > 1) return -EINVAL; } local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) + sizeof(void *) * channels, GFP_KERNEL); if (!local->int_scan_req) return -ENOMEM; for (band = 0; band < NUM_NL80211_BANDS; band++) { if (!local->hw.wiphy->bands[band]) continue; local->int_scan_req->rates[band] = (u32) -1; } #ifndef CONFIG_MAC80211_MESH /* mesh depends on Kconfig, but drivers should set it if they want */ local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT); #endif /* if the underlying driver supports mesh, mac80211 will (at least) * provide routing of mesh authentication frames to userspace */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT)) local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH; /* mac80211 supports control port protocol changing */ local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL; if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) { local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; } else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) { local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC; if (hw->max_signal <= 0) { result = -EINVAL; goto fail_workqueue; } } /* Mac80211 and therefore all drivers using SW crypto only * are able to handle PTK rekeys and Extended Key ID. */ if (!local->ops->set_key) { wiphy_ext_feature_set(local->hw.wiphy, NL80211_EXT_FEATURE_CAN_REPLACE_PTK0); wiphy_ext_feature_set(local->hw.wiphy, NL80211_EXT_FEATURE_EXT_KEY_ID); } if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_ADHOC)) wiphy_ext_feature_set(local->hw.wiphy, NL80211_EXT_FEATURE_DEL_IBSS_STA); /* * Calculate scan IE length -- we need this to alloc * memory and to subtract from the driver limit. It * includes the DS Params, (extended) supported rates, and HT * information -- SSID is the driver's responsibility. */ local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ + 3 /* DS Params */; if (supp_ht) local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap); if (supp_vht) local->scan_ies_len += 2 + sizeof(struct ieee80211_vht_cap); /* HE cap element is variable in size - set len to allow max size */ /* * TODO: 1 is added at the end of the calculation to accommodate for * the temporary placing of the HE capabilities IE under EXT. * Remove it once it is placed in the final place. */ if (supp_he) local->scan_ies_len += 2 + sizeof(struct ieee80211_he_cap_elem) + sizeof(struct ieee80211_he_mcs_nss_supp) + IEEE80211_HE_PPE_THRES_MAX_LEN + 1; 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; WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes, local->hw.n_cipher_schemes)); result = ieee80211_init_cipher_suites(local); if (result < 0) goto fail_workqueue; if (!local->ops->remain_on_channel) local->hw.wiphy->max_remain_on_channel_duration = 5000; /* mac80211 based drivers don't support internal TDLS setup */ if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP; /* mac80211 supports eCSA, if the driver supports STA CSA at all */ if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING; /* mac80211 supports multi BSSID, if the driver supports it */ if (ieee80211_hw_check(&local->hw, SUPPORTS_MULTI_BSSID)) { local->hw.wiphy->support_mbssid = true; if (ieee80211_hw_check(&local->hw, SUPPORTS_ONLY_HE_MULTI_BSSID)) local->hw.wiphy->support_only_he_mbssid = true; else local->ext_capa[2] |= WLAN_EXT_CAPA3_MULTI_BSSID_SUPPORT; } local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; /* * 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 = alloc_ordered_workqueue("%s", 0, 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. */ local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom, IEEE80211_TX_STATUS_HEADROOM); /* * 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; if (!local->hw.max_nan_de_entries) local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID; if (!local->hw.weight_multiplier) local->hw.weight_multiplier = 1; ieee80211_wep_init(local); local->hw.conf.flags = IEEE80211_CONF_IDLE; ieee80211_led_init(local); result = ieee80211_txq_setup_flows(local); if (result) goto fail_flows; rtnl_lock(); result = ieee80211_init_rate_ctrl_alg(local, hw->rate_control_algorithm); rtnl_unlock(); if (result < 0) { wiphy_debug(local->hw.wiphy, "Failed to initialize rate control algorithm\n"); goto fail_rate; } if (local->rate_ctrl) { clear_bit(IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW, hw->flags); if (local->rate_ctrl->ops->capa & RATE_CTRL_CAPA_VHT_EXT_NSS_BW) ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW); } /* * If the VHT capabilities don't have IEEE80211_VHT_EXT_NSS_BW_CAPABLE, * or have it when we don't, copy the sband structure and set/clear it. * This is necessary because rate scaling algorithms could be switched * and have different support values. * Print a message so that in the common case the reallocation can be * avoided. */ BUILD_BUG_ON(NUM_NL80211_BANDS > 8 * sizeof(local->sband_allocated)); for (band = 0; band < NUM_NL80211_BANDS; band++) { struct ieee80211_supported_band *sband; bool local_cap, ie_cap; local_cap = ieee80211_hw_check(hw, SUPPORTS_VHT_EXT_NSS_BW); sband = local->hw.wiphy->bands[band]; if (!sband || !sband->vht_cap.vht_supported) continue; ie_cap = !!(sband->vht_cap.vht_mcs.tx_highest & cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)); if (local_cap == ie_cap) continue; sband = kmemdup(sband, sizeof(*sband), GFP_KERNEL); if (!sband) { result = -ENOMEM; goto fail_rate; } wiphy_dbg(hw->wiphy, "copying sband (band %d) due to VHT EXT NSS BW flag\n", band); sband->vht_cap.vht_mcs.tx_highest ^= cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE); local->hw.wiphy->bands[band] = sband; local->sband_allocated |= BIT(band); } result = wiphy_register(local->hw.wiphy); if (result < 0) goto fail_wiphy_register; debugfs_hw_add(local); rate_control_add_debugfs(local); rtnl_lock(); /* add one default STA interface if supported */ if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) && !ieee80211_hw_check(hw, NO_AUTO_VIF)) { struct vif_params params = {0}; result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL, NL80211_IFTYPE_STATION, ¶ms); if (result) wiphy_warn(local->hw.wiphy, "Failed to add default virtual iface\n"); } rtnl_unlock(); #ifdef CONFIG_INET local->ifa_notifier.notifier_call = ieee80211_ifa_changed; result = register_inetaddr_notifier(&local->ifa_notifier); if (result) goto fail_ifa; #endif #if IS_ENABLED(CONFIG_IPV6) local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed; result = register_inet6addr_notifier(&local->ifa6_notifier); if (result) goto fail_ifa6; #endif return 0; #if IS_ENABLED(CONFIG_IPV6) fail_ifa6: #ifdef CONFIG_INET unregister_inetaddr_notifier(&local->ifa_notifier); #endif #endif #if defined(CONFIG_INET) || defined(CONFIG_IPV6) fail_ifa: #endif wiphy_unregister(local->hw.wiphy); fail_wiphy_register: rtnl_lock(); rate_control_deinitialize(local); ieee80211_remove_interfaces(local); rtnl_unlock(); fail_rate: fail_flows: ieee80211_led_exit(local); destroy_workqueue(local->workqueue); fail_workqueue: if (local->wiphy_ciphers_allocated) kfree(local->hw.wiphy->cipher_suites); 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); #ifdef CONFIG_INET unregister_inetaddr_notifier(&local->ifa_notifier); #endif #if IS_ENABLED(CONFIG_IPV6) unregister_inet6addr_notifier(&local->ifa6_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_delayed_work_sync(&local->roc_work); cancel_work_sync(&local->restart_work); cancel_work_sync(&local->reconfig_filter); cancel_work_sync(&local->tdls_chsw_work); flush_work(&local->sched_scan_stopped_work); flush_work(&local->radar_detected_work); ieee80211_clear_tx_pending(local); rate_control_deinitialize(local); if (skb_queue_len(&local->skb_queue) || skb_queue_len(&local->skb_queue_unreliable)) wiphy_warn(local->hw.wiphy, "skb_queue not empty\n"); skb_queue_purge(&local->skb_queue); skb_queue_purge(&local->skb_queue_unreliable); skb_queue_purge(&local->skb_queue_tdls_chsw); wiphy_unregister(local->hw.wiphy); destroy_workqueue(local->workqueue); ieee80211_led_exit(local); kfree(local->int_scan_req); } EXPORT_SYMBOL(ieee80211_unregister_hw); static int ieee80211_free_ack_frame(int id, void *p, void *data) { WARN_ONCE(1, "Have pending ack frames!\n"); kfree_skb(p); return 0; } void ieee80211_free_hw(struct ieee80211_hw *hw) { struct ieee80211_local *local = hw_to_local(hw); enum nl80211_band band; mutex_destroy(&local->iflist_mtx); mutex_destroy(&local->mtx); if (local->wiphy_ciphers_allocated) kfree(local->hw.wiphy->cipher_suites); idr_for_each(&local->ack_status_frames, ieee80211_free_ack_frame, NULL); idr_destroy(&local->ack_status_frames); sta_info_stop(local); ieee80211_free_led_names(local); for (band = 0; band < NUM_NL80211_BANDS; band++) { if (!(local->sband_allocated & BIT(band))) continue; kfree(local->hw.wiphy->bands[band]); } 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 = ieee80211_iface_init(); if (ret) goto err_netdev; return 0; err_netdev: rc80211_minstrel_exit(); return ret; } static void __exit ieee80211_exit(void) { rc80211_minstrel_exit(); ieee80211s_stop(); ieee80211_iface_exit(); rcu_barrier(); } subsys_initcall(ieee80211_init); module_exit(ieee80211_exit); MODULE_DESCRIPTION("IEEE 802.11 subsystem"); MODULE_LICENSE("GPL");