/* * BSS client mode implementation * Copyright 2003-2008, Jouni Malinen * Copyright 2004, Instant802 Networks, Inc. * Copyright 2005, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2007, Michael Wu * * 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 "ieee80211_i.h" #include "driver-ops.h" #include "rate.h" #include "led.h" #define IEEE80211_AUTH_TIMEOUT (HZ / 5) #define IEEE80211_AUTH_MAX_TRIES 3 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) #define IEEE80211_ASSOC_MAX_TRIES 3 static int max_nullfunc_tries = 2; module_param(max_nullfunc_tries, int, 0644); MODULE_PARM_DESC(max_nullfunc_tries, "Maximum nullfunc tx tries before disconnecting (reason 4)."); static int max_probe_tries = 5; module_param(max_probe_tries, int, 0644); MODULE_PARM_DESC(max_probe_tries, "Maximum probe tries before disconnecting (reason 4)."); /* * Beacon loss timeout is calculated as N frames times the * advertised beacon interval. This may need to be somewhat * higher than what hardware might detect to account for * delays in the host processing frames. But since we also * probe on beacon miss before declaring the connection lost * default to what we want. */ #define IEEE80211_BEACON_LOSS_COUNT 7 /* * Time the connection can be idle before we probe * it to see if we can still talk to the AP. */ #define IEEE80211_CONNECTION_IDLE_TIME (30 * HZ) /* * Time we wait for a probe response after sending * a probe request because of beacon loss or for * checking the connection still works. */ static int probe_wait_ms = 500; module_param(probe_wait_ms, int, 0644); MODULE_PARM_DESC(probe_wait_ms, "Maximum time(ms) to wait for probe response" " before disconnecting (reason 4)."); /* * Weight given to the latest Beacon frame when calculating average signal * strength for Beacon frames received in the current BSS. This must be * between 1 and 15. */ #define IEEE80211_SIGNAL_AVE_WEIGHT 3 /* * How many Beacon frames need to have been used in average signal strength * before starting to indicate signal change events. */ #define IEEE80211_SIGNAL_AVE_MIN_COUNT 4 #define TMR_RUNNING_TIMER 0 #define TMR_RUNNING_CHANSW 1 #define DEAUTH_DISASSOC_LEN (24 /* hdr */ + 2 /* reason */) /* * All cfg80211 functions have to be called outside a locked * section so that they can acquire a lock themselves... This * is much simpler than queuing up things in cfg80211, but we * do need some indirection for that here. */ enum rx_mgmt_action { /* no action required */ RX_MGMT_NONE, /* caller must call cfg80211_send_deauth() */ RX_MGMT_CFG80211_DEAUTH, /* caller must call cfg80211_send_disassoc() */ RX_MGMT_CFG80211_DISASSOC, /* caller must call cfg80211_send_rx_auth() */ RX_MGMT_CFG80211_RX_AUTH, /* caller must call cfg80211_send_rx_assoc() */ RX_MGMT_CFG80211_RX_ASSOC, /* caller must call cfg80211_send_assoc_timeout() */ RX_MGMT_CFG80211_ASSOC_TIMEOUT, }; /* utils */ static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd) { lockdep_assert_held(&ifmgd->mtx); } /* * We can have multiple work items (and connection probing) * scheduling this timer, but we need to take care to only * reschedule it when it should fire _earlier_ than it was * asked for before, or if it's not pending right now. This * function ensures that. Note that it then is required to * run this function for all timeouts after the first one * has happened -- the work that runs from this timer will * do that. */ static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout) { ASSERT_MGD_MTX(ifmgd); if (!timer_pending(&ifmgd->timer) || time_before(timeout, ifmgd->timer.expires)) mod_timer(&ifmgd->timer, timeout); } void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata) { if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER) return; if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) return; mod_timer(&sdata->u.mgd.bcn_mon_timer, round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout)); } void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (unlikely(!sdata->u.mgd.associated)) return; if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) return; mod_timer(&sdata->u.mgd.conn_mon_timer, round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); ifmgd->probe_send_count = 0; } static int ecw2cw(int ecw) { return (1 << ecw) - 1; } static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata, struct ieee80211_ht_operation *ht_oper, const u8 *bssid, bool reconfig) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sta_info *sta; u32 changed = 0; u16 ht_opmode; bool disable_40 = false; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; switch (sdata->vif.bss_conf.channel_type) { case NL80211_CHAN_HT40PLUS: if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS) disable_40 = true; break; case NL80211_CHAN_HT40MINUS: if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS) disable_40 = true; break; default: break; } /* This can change during the lifetime of the BSS */ if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) disable_40 = true; mutex_lock(&local->sta_mtx); sta = sta_info_get(sdata, bssid); WARN_ON_ONCE(!sta); if (sta && !sta->supports_40mhz) disable_40 = true; if (sta && (!reconfig || (disable_40 != !(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) { if (disable_40) sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; else sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40; rate_control_rate_update(local, sband, sta, IEEE80211_RC_BW_CHANGED); } mutex_unlock(&local->sta_mtx); ht_opmode = le16_to_cpu(ht_oper->operation_mode); /* if bss configuration changed store the new one */ if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) { changed |= BSS_CHANGED_HT; sdata->vif.bss_conf.ht_operation_mode = ht_opmode; } return changed; } /* frame sending functions */ static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len, struct ieee80211_supported_band *sband, u32 *rates) { int i, j, count; *rates = 0; count = 0; for (i = 0; i < supp_rates_len; i++) { int rate = (supp_rates[i] & 0x7F) * 5; for (j = 0; j < sband->n_bitrates; j++) if (sband->bitrates[j].bitrate == rate) { *rates |= BIT(j); count++; break; } } return count; } static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, u8 ap_ht_param, struct ieee80211_supported_band *sband, struct ieee80211_channel *channel, enum ieee80211_smps_mode smps) { u8 *pos; u32 flags = channel->flags; u16 cap; struct ieee80211_sta_ht_cap ht_cap; BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap)); memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); ieee80211_apply_htcap_overrides(sdata, &ht_cap); /* determine capability flags */ cap = ht_cap.cap; switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: if (flags & IEEE80211_CHAN_NO_HT40PLUS) { cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; cap &= ~IEEE80211_HT_CAP_SGI_40; } break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: if (flags & IEEE80211_CHAN_NO_HT40MINUS) { cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; cap &= ~IEEE80211_HT_CAP_SGI_40; } break; } /* * If 40 MHz was disabled associate as though we weren't * capable of 40 MHz -- some broken APs will never fall * back to trying to transmit in 20 MHz. */ if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) { cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; cap &= ~IEEE80211_HT_CAP_SGI_40; } /* set SM PS mode properly */ cap &= ~IEEE80211_HT_CAP_SM_PS; switch (smps) { case IEEE80211_SMPS_AUTOMATIC: case IEEE80211_SMPS_NUM_MODES: WARN_ON(1); case IEEE80211_SMPS_OFF: cap |= WLAN_HT_CAP_SM_PS_DISABLED << IEEE80211_HT_CAP_SM_PS_SHIFT; break; case IEEE80211_SMPS_STATIC: cap |= WLAN_HT_CAP_SM_PS_STATIC << IEEE80211_HT_CAP_SM_PS_SHIFT; break; case IEEE80211_SMPS_DYNAMIC: cap |= WLAN_HT_CAP_SM_PS_DYNAMIC << IEEE80211_HT_CAP_SM_PS_SHIFT; break; } /* reserve and fill IE */ pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); ieee80211_ie_build_ht_cap(pos, &ht_cap, cap); } static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, struct ieee80211_supported_band *sband) { u8 *pos; u32 cap; struct ieee80211_sta_vht_cap vht_cap; BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap)); memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); /* determine capability flags */ cap = vht_cap.cap; /* reserve and fill IE */ pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2); ieee80211_ie_build_vht_cap(pos, &vht_cap, cap); } static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos, qos_info; size_t offset = 0, noffset; int i, count, rates_len, supp_rates_len; u16 capab; struct ieee80211_supported_band *sband; u32 rates = 0; lockdep_assert_held(&ifmgd->mtx); sband = local->hw.wiphy->bands[local->oper_channel->band]; if (assoc_data->supp_rates_len) { /* * Get all rates supported by the device and the AP as * some APs don't like getting a superset of their rates * in the association request (e.g. D-Link DAP 1353 in * b-only mode)... */ rates_len = ieee80211_compatible_rates(assoc_data->supp_rates, assoc_data->supp_rates_len, sband, &rates); } else { /* * In case AP not provide any supported rates information * before association, we send information element(s) with * all rates that we support. */ rates = ~0; rates_len = sband->n_bitrates; } skb = alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + /* bit too much but doesn't matter */ 2 + assoc_data->ssid_len + /* SSID */ 4 + rates_len + /* (extended) rates */ 4 + /* power capability */ 2 + 2 * sband->n_channels + /* supported channels */ 2 + sizeof(struct ieee80211_ht_cap) + /* HT */ 2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */ assoc_data->ie_len + /* extra IEs */ 9, /* WMM */ GFP_KERNEL); if (!skb) return; skb_reserve(skb, local->hw.extra_tx_headroom); capab = WLAN_CAPABILITY_ESS; if (sband->band == IEEE80211_BAND_2GHZ) { if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; } if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY) capab |= WLAN_CAPABILITY_PRIVACY; if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN); if (!is_zero_ether_addr(assoc_data->prev_bssid)) { skb_put(skb, 10); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_REASSOC_REQ); mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); mgmt->u.reassoc_req.listen_interval = cpu_to_le16(local->hw.conf.listen_interval); memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid, ETH_ALEN); } else { skb_put(skb, 4); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ASSOC_REQ); mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); mgmt->u.assoc_req.listen_interval = cpu_to_le16(local->hw.conf.listen_interval); } /* SSID */ pos = skb_put(skb, 2 + assoc_data->ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = assoc_data->ssid_len; memcpy(pos, assoc_data->ssid, assoc_data->ssid_len); /* add all rates which were marked to be used above */ supp_rates_len = rates_len; if (supp_rates_len > 8) supp_rates_len = 8; pos = skb_put(skb, supp_rates_len + 2); *pos++ = WLAN_EID_SUPP_RATES; *pos++ = supp_rates_len; count = 0; for (i = 0; i < sband->n_bitrates; i++) { if (BIT(i) & rates) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); if (++count == 8) break; } } if (rates_len > count) { pos = skb_put(skb, rates_len - count + 2); *pos++ = WLAN_EID_EXT_SUPP_RATES; *pos++ = rates_len - count; for (i++; i < sband->n_bitrates; i++) { if (BIT(i) & rates) { int rate = sband->bitrates[i].bitrate; *pos++ = (u8) (rate / 5); } } } if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { /* 1. power capabilities */ pos = skb_put(skb, 4); *pos++ = WLAN_EID_PWR_CAPABILITY; *pos++ = 2; *pos++ = 0; /* min tx power */ *pos++ = local->oper_channel->max_power; /* max tx power */ /* 2. supported channels */ /* TODO: get this in reg domain format */ pos = skb_put(skb, 2 * sband->n_channels + 2); *pos++ = WLAN_EID_SUPPORTED_CHANNELS; *pos++ = 2 * sband->n_channels; for (i = 0; i < sband->n_channels; i++) { *pos++ = ieee80211_frequency_to_channel( sband->channels[i].center_freq); *pos++ = 1; /* one channel in the subband*/ } } /* if present, add any custom IEs that go before HT */ if (assoc_data->ie_len && assoc_data->ie) { static const u8 before_ht[] = { WLAN_EID_SSID, WLAN_EID_SUPP_RATES, WLAN_EID_EXT_SUPP_RATES, WLAN_EID_PWR_CAPABILITY, WLAN_EID_SUPPORTED_CHANNELS, WLAN_EID_RSN, WLAN_EID_QOS_CAPA, WLAN_EID_RRM_ENABLED_CAPABILITIES, WLAN_EID_MOBILITY_DOMAIN, WLAN_EID_SUPPORTED_REGULATORY_CLASSES, }; noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len, before_ht, ARRAY_SIZE(before_ht), offset); pos = skb_put(skb, noffset - offset); memcpy(pos, assoc_data->ie + offset, noffset - offset); offset = noffset; } if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, sband, local->oper_channel, ifmgd->ap_smps); if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) ieee80211_add_vht_ie(sdata, skb, sband); /* if present, add any custom non-vendor IEs that go after HT */ if (assoc_data->ie_len && assoc_data->ie) { noffset = ieee80211_ie_split_vendor(assoc_data->ie, assoc_data->ie_len, offset); pos = skb_put(skb, noffset - offset); memcpy(pos, assoc_data->ie + offset, noffset - offset); offset = noffset; } if (assoc_data->wmm) { if (assoc_data->uapsd) { qos_info = ifmgd->uapsd_queues; qos_info |= (ifmgd->uapsd_max_sp_len << IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT); } else { qos_info = 0; } pos = skb_put(skb, 9); *pos++ = WLAN_EID_VENDOR_SPECIFIC; *pos++ = 7; /* len */ *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ *pos++ = 0x50; *pos++ = 0xf2; *pos++ = 2; /* WME */ *pos++ = 0; /* WME info */ *pos++ = 1; /* WME ver */ *pos++ = qos_info; } /* add any remaining custom (i.e. vendor specific here) IEs */ if (assoc_data->ie_len && assoc_data->ie) { noffset = assoc_data->ie_len; pos = skb_put(skb, noffset - offset); memcpy(pos, assoc_data->ie + offset, noffset - offset); } drv_mgd_prepare_tx(local, sdata); IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; ieee80211_tx_skb(sdata, skb); } static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, const u8 *bssid, u16 stype, u16 reason, bool send_frame, u8 *frame_buf) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct sk_buff *skb; struct ieee80211_mgmt *mgmt = (void *)frame_buf; /* build frame */ mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); mgmt->duration = 0; /* initialize only */ mgmt->seq_ctrl = 0; /* initialize only */ memcpy(mgmt->da, bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); memcpy(mgmt->bssid, bssid, ETH_ALEN); /* u.deauth.reason_code == u.disassoc.reason_code */ mgmt->u.deauth.reason_code = cpu_to_le16(reason); if (send_frame) { skb = dev_alloc_skb(local->hw.extra_tx_headroom + DEAUTH_DISASSOC_LEN); if (!skb) return; skb_reserve(skb, local->hw.extra_tx_headroom); /* copy in frame */ memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN), mgmt, DEAUTH_DISASSOC_LEN); if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED)) IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; ieee80211_tx_skb(sdata, skb); } } void ieee80211_send_pspoll(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata) { struct ieee80211_pspoll *pspoll; struct sk_buff *skb; skb = ieee80211_pspoll_get(&local->hw, &sdata->vif); if (!skb) return; pspoll = (struct ieee80211_pspoll *) skb->data; pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; ieee80211_tx_skb(sdata, skb); } void ieee80211_send_nullfunc(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, int powersave) { struct sk_buff *skb; struct ieee80211_hdr_3addr *nullfunc; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif); if (!skb) return; nullfunc = (struct ieee80211_hdr_3addr *) skb->data; if (powersave) nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | IEEE80211_STA_CONNECTION_POLL)) IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE; ieee80211_tx_skb(sdata, skb); } static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata) { struct sk_buff *skb; struct ieee80211_hdr *nullfunc; __le16 fc; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) return; skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); if (!skb) return; skb_reserve(skb, local->hw.extra_tx_headroom); nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); memset(nullfunc, 0, 30); fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); nullfunc->frame_control = fc; memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; ieee80211_tx_skb(sdata, skb); } /* spectrum management related things */ static void ieee80211_chswitch_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (!ieee80211_sdata_running(sdata)) return; mutex_lock(&ifmgd->mtx); if (!ifmgd->associated) goto out; sdata->local->oper_channel = sdata->local->csa_channel; if (!sdata->local->ops->channel_switch) { /* call "hw_config" only if doing sw channel switch */ ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL); } else { /* update the device channel directly */ sdata->local->hw.conf.channel = sdata->local->oper_channel; } /* XXX: shouldn't really modify cfg80211-owned data! */ ifmgd->associated->channel = sdata->local->oper_channel; ieee80211_wake_queues_by_reason(&sdata->local->hw, IEEE80211_QUEUE_STOP_REASON_CSA); out: ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; mutex_unlock(&ifmgd->mtx); } void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success) { struct ieee80211_sub_if_data *sdata; struct ieee80211_if_managed *ifmgd; sdata = vif_to_sdata(vif); ifmgd = &sdata->u.mgd; trace_api_chswitch_done(sdata, success); if (!success) { /* * If the channel switch was not successful, stay * around on the old channel. We currently lack * good handling of this situation, possibly we * should just drop the association. */ sdata->local->csa_channel = sdata->local->oper_channel; } ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); } EXPORT_SYMBOL(ieee80211_chswitch_done); static void ieee80211_chswitch_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (sdata->local->quiescing) { set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); return; } ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); } void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, struct ieee80211_channel_sw_ie *sw_elem, struct ieee80211_bss *bss, u64 timestamp) { struct cfg80211_bss *cbss = container_of((void *)bss, struct cfg80211_bss, priv); struct ieee80211_channel *new_ch; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num, cbss->channel->band); ASSERT_MGD_MTX(ifmgd); if (!ifmgd->associated) return; if (sdata->local->scanning) return; /* Disregard subsequent beacons if we are already running a timer processing a CSA */ if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) return; new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) return; sdata->local->csa_channel = new_ch; if (sdata->local->ops->channel_switch) { /* use driver's channel switch callback */ struct ieee80211_channel_switch ch_switch; memset(&ch_switch, 0, sizeof(ch_switch)); ch_switch.timestamp = timestamp; if (sw_elem->mode) { ch_switch.block_tx = true; ieee80211_stop_queues_by_reason(&sdata->local->hw, IEEE80211_QUEUE_STOP_REASON_CSA); } ch_switch.channel = new_ch; ch_switch.count = sw_elem->count; ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; drv_channel_switch(sdata->local, &ch_switch); return; } /* channel switch handled in software */ if (sw_elem->count <= 1) { ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work); } else { if (sw_elem->mode) ieee80211_stop_queues_by_reason(&sdata->local->hw, IEEE80211_QUEUE_STOP_REASON_CSA); ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; mod_timer(&ifmgd->chswitch_timer, jiffies + msecs_to_jiffies(sw_elem->count * cbss->beacon_interval)); } } static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, u16 capab_info, u8 *pwr_constr_elem, u8 pwr_constr_elem_len) { struct ieee80211_conf *conf = &sdata->local->hw.conf; if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT)) return; /* Power constraint IE length should be 1 octet */ if (pwr_constr_elem_len != 1) return; if ((*pwr_constr_elem <= conf->channel->max_reg_power) && (*pwr_constr_elem != sdata->local->power_constr_level)) { sdata->local->power_constr_level = *pwr_constr_elem; ieee80211_hw_config(sdata->local, 0); } } void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_local *local = sdata->local; struct ieee80211_conf *conf = &local->hw.conf; WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); local->disable_dynamic_ps = false; conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; } EXPORT_SYMBOL(ieee80211_enable_dyn_ps); void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_local *local = sdata->local; struct ieee80211_conf *conf = &local->hw.conf; WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION || !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) || (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)); local->disable_dynamic_ps = true; conf->dynamic_ps_timeout = 0; del_timer_sync(&local->dynamic_ps_timer); ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); } EXPORT_SYMBOL(ieee80211_disable_dyn_ps); /* powersave */ static void ieee80211_enable_ps(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata) { struct ieee80211_conf *conf = &local->hw.conf; /* * If we are scanning right now then the parameters will * take effect when scan finishes. */ if (local->scanning) return; if (conf->dynamic_ps_timeout > 0 && !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) { mod_timer(&local->dynamic_ps_timer, jiffies + msecs_to_jiffies(conf->dynamic_ps_timeout)); } else { if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) ieee80211_send_nullfunc(local, sdata, 1); if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) return; conf->flags |= IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } } static void ieee80211_change_ps(struct ieee80211_local *local) { struct ieee80211_conf *conf = &local->hw.conf; if (local->ps_sdata) { ieee80211_enable_ps(local, local->ps_sdata); } else if (conf->flags & IEEE80211_CONF_PS) { conf->flags &= ~IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); del_timer_sync(&local->dynamic_ps_timer); cancel_work_sync(&local->dynamic_ps_enable_work); } } static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *mgd = &sdata->u.mgd; struct sta_info *sta = NULL; bool authorized = false; if (!mgd->powersave) return false; if (mgd->broken_ap) return false; if (!mgd->associated) return false; if (mgd->flags & (IEEE80211_STA_BEACON_POLL | IEEE80211_STA_CONNECTION_POLL)) return false; rcu_read_lock(); sta = sta_info_get(sdata, mgd->bssid); if (sta) authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); rcu_read_unlock(); return authorized; } /* need to hold RTNL or interface lock */ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency) { struct ieee80211_sub_if_data *sdata, *found = NULL; int count = 0; int timeout; if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { local->ps_sdata = NULL; return; } list_for_each_entry(sdata, &local->interfaces, list) { if (!ieee80211_sdata_running(sdata)) continue; if (sdata->vif.type == NL80211_IFTYPE_AP) { /* If an AP vif is found, then disable PS * by setting the count to zero thereby setting * ps_sdata to NULL. */ count = 0; break; } if (sdata->vif.type != NL80211_IFTYPE_STATION) continue; found = sdata; count++; } if (count == 1 && ieee80211_powersave_allowed(found)) { struct ieee80211_conf *conf = &local->hw.conf; s32 beaconint_us; if (latency < 0) latency = pm_qos_request(PM_QOS_NETWORK_LATENCY); beaconint_us = ieee80211_tu_to_usec( found->vif.bss_conf.beacon_int); timeout = local->dynamic_ps_forced_timeout; if (timeout < 0) { /* * Go to full PSM if the user configures a very low * latency requirement. * The 2000 second value is there for compatibility * until the PM_QOS_NETWORK_LATENCY is configured * with real values. */ if (latency > (1900 * USEC_PER_MSEC) && latency != (2000 * USEC_PER_SEC)) timeout = 0; else timeout = 100; } local->dynamic_ps_user_timeout = timeout; if (!local->disable_dynamic_ps) conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout; if (beaconint_us > latency) { local->ps_sdata = NULL; } else { struct ieee80211_bss *bss; int maxslp = 1; u8 dtimper; bss = (void *)found->u.mgd.associated->priv; dtimper = bss->dtim_period; /* If the TIM IE is invalid, pretend the value is 1 */ if (!dtimper) dtimper = 1; else if (dtimper > 1) maxslp = min_t(int, dtimper, latency / beaconint_us); local->hw.conf.max_sleep_period = maxslp; local->hw.conf.ps_dtim_period = dtimper; local->ps_sdata = found; } } else { local->ps_sdata = NULL; } ieee80211_change_ps(local); } void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata) { bool ps_allowed = ieee80211_powersave_allowed(sdata); if (sdata->vif.bss_conf.ps != ps_allowed) { sdata->vif.bss_conf.ps = ps_allowed; ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS); } } void ieee80211_dynamic_ps_disable_work(struct work_struct *work) { struct ieee80211_local *local = container_of(work, struct ieee80211_local, dynamic_ps_disable_work); if (local->hw.conf.flags & IEEE80211_CONF_PS) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_QUEUE_STOP_REASON_PS); } void ieee80211_dynamic_ps_enable_work(struct work_struct *work) { struct ieee80211_local *local = container_of(work, struct ieee80211_local, dynamic_ps_enable_work); struct ieee80211_sub_if_data *sdata = local->ps_sdata; struct ieee80211_if_managed *ifmgd; unsigned long flags; int q; /* can only happen when PS was just disabled anyway */ if (!sdata) return; ifmgd = &sdata->u.mgd; if (local->hw.conf.flags & IEEE80211_CONF_PS) return; if (!local->disable_dynamic_ps && local->hw.conf.dynamic_ps_timeout > 0) { /* don't enter PS if TX frames are pending */ if (drv_tx_frames_pending(local)) { mod_timer(&local->dynamic_ps_timer, jiffies + msecs_to_jiffies( local->hw.conf.dynamic_ps_timeout)); return; } /* * transmission can be stopped by others which leads to * dynamic_ps_timer expiry. Postpone the ps timer if it * is not the actual idle state. */ spin_lock_irqsave(&local->queue_stop_reason_lock, flags); for (q = 0; q < local->hw.queues; q++) { if (local->queue_stop_reasons[q]) { spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); mod_timer(&local->dynamic_ps_timer, jiffies + msecs_to_jiffies( local->hw.conf.dynamic_ps_timeout)); return; } } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { netif_tx_stop_all_queues(sdata->dev); if (drv_tx_frames_pending(local)) mod_timer(&local->dynamic_ps_timer, jiffies + msecs_to_jiffies( local->hw.conf.dynamic_ps_timeout)); else { ieee80211_send_nullfunc(local, sdata, 1); /* Flush to get the tx status of nullfunc frame */ drv_flush(local, false); } } if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) || (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) { ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; local->hw.conf.flags |= IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) netif_tx_wake_all_queues(sdata->dev); } void ieee80211_dynamic_ps_timer(unsigned long data) { struct ieee80211_local *local = (void *) data; if (local->quiescing || local->suspended) return; ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work); } /* MLME */ static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, u8 *wmm_param, size_t wmm_param_len) { struct ieee80211_tx_queue_params params; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; size_t left; int count; u8 *pos, uapsd_queues = 0; if (!local->ops->conf_tx) return false; if (local->hw.queues < IEEE80211_NUM_ACS) return false; if (!wmm_param) return false; if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) return false; if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) uapsd_queues = ifmgd->uapsd_queues; count = wmm_param[6] & 0x0f; if (count == ifmgd->wmm_last_param_set) return false; ifmgd->wmm_last_param_set = count; pos = wmm_param + 8; left = wmm_param_len - 8; memset(¶ms, 0, sizeof(params)); sdata->wmm_acm = 0; for (; left >= 4; left -= 4, pos += 4) { int aci = (pos[0] >> 5) & 0x03; int acm = (pos[0] >> 4) & 0x01; bool uapsd = false; int queue; switch (aci) { case 1: /* AC_BK */ queue = 3; if (acm) sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK) uapsd = true; break; case 2: /* AC_VI */ queue = 1; if (acm) sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI) uapsd = true; break; case 3: /* AC_VO */ queue = 0; if (acm) sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) uapsd = true; break; case 0: /* AC_BE */ default: queue = 2; if (acm) sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE) uapsd = true; break; } params.aifs = pos[0] & 0x0f; params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); params.cw_min = ecw2cw(pos[1] & 0x0f); params.txop = get_unaligned_le16(pos + 2); params.uapsd = uapsd; mlme_dbg(sdata, "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n", queue, aci, acm, params.aifs, params.cw_min, params.cw_max, params.txop, params.uapsd); sdata->tx_conf[queue] = params; if (drv_conf_tx(local, sdata, queue, ¶ms)) sdata_err(sdata, "failed to set TX queue parameters for queue %d\n", queue); } /* enable WMM or activate new settings */ sdata->vif.bss_conf.qos = true; return true; } static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) { lockdep_assert_held(&sdata->local->mtx); sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL | IEEE80211_STA_BEACON_POLL); ieee80211_run_deferred_scan(sdata->local); } static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata) { mutex_lock(&sdata->local->mtx); __ieee80211_stop_poll(sdata); mutex_unlock(&sdata->local->mtx); } static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, u16 capab, bool erp_valid, u8 erp) { struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; u32 changed = 0; bool use_protection; bool use_short_preamble; bool use_short_slot; if (erp_valid) { use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; } else { use_protection = false; use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); } use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) use_short_slot = true; if (use_protection != bss_conf->use_cts_prot) { bss_conf->use_cts_prot = use_protection; changed |= BSS_CHANGED_ERP_CTS_PROT; } if (use_short_preamble != bss_conf->use_short_preamble) { bss_conf->use_short_preamble = use_short_preamble; changed |= BSS_CHANGED_ERP_PREAMBLE; } if (use_short_slot != bss_conf->use_short_slot) { bss_conf->use_short_slot = use_short_slot; changed |= BSS_CHANGED_ERP_SLOT; } return changed; } static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, struct cfg80211_bss *cbss, u32 bss_info_changed) { struct ieee80211_bss *bss = (void *)cbss->priv; struct ieee80211_local *local = sdata->local; struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; bss_info_changed |= BSS_CHANGED_ASSOC; bss_info_changed |= ieee80211_handle_bss_capability(sdata, bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value); sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec( IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int)); sdata->u.mgd.associated = cbss; memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN); sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE; /* just to be sure */ ieee80211_stop_poll(sdata); ieee80211_led_assoc(local, 1); if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) bss_conf->dtim_period = bss->dtim_period; else bss_conf->dtim_period = 0; bss_conf->assoc = 1; /* Tell the driver to monitor connection quality (if supported) */ if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI && bss_conf->cqm_rssi_thold) bss_info_changed |= BSS_CHANGED_CQM; /* Enable ARP filtering */ if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) { bss_conf->arp_filter_enabled = sdata->arp_filter_state; bss_info_changed |= BSS_CHANGED_ARP_FILTER; } ieee80211_bss_info_change_notify(sdata, bss_info_changed); mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); ieee80211_recalc_smps(local); mutex_unlock(&local->iflist_mtx); ieee80211_recalc_ps_vif(sdata); netif_tx_start_all_queues(sdata->dev); netif_carrier_on(sdata->dev); } static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, u16 stype, u16 reason, bool tx, u8 *frame_buf) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct sta_info *sta; u32 changed = 0; ASSERT_MGD_MTX(ifmgd); if (WARN_ON_ONCE(tx && !frame_buf)) return; if (WARN_ON(!ifmgd->associated)) return; ieee80211_stop_poll(sdata); ifmgd->associated = NULL; /* * we need to commit the associated = NULL change because the * scan code uses that to determine whether this iface should * go to/wake up from powersave or not -- and could otherwise * wake the queues erroneously. */ smp_mb(); /* * Thus, we can only afterwards stop the queues -- to account * for the case where another CPU is finishing a scan at this * time -- we don't want the scan code to enable queues. */ netif_tx_stop_all_queues(sdata->dev); netif_carrier_off(sdata->dev); mutex_lock(&local->sta_mtx); sta = sta_info_get(sdata, ifmgd->bssid); if (sta) { set_sta_flag(sta, WLAN_STA_BLOCK_BA); ieee80211_sta_tear_down_BA_sessions(sta, tx); } mutex_unlock(&local->sta_mtx); /* * if we want to get out of ps before disassoc (why?) we have * to do it before sending disassoc, as otherwise the null-packet * won't be valid. */ if (local->hw.conf.flags & IEEE80211_CONF_PS) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } local->ps_sdata = NULL; /* disable per-vif ps */ ieee80211_recalc_ps_vif(sdata); /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */ if (tx) drv_flush(local, false); /* deauthenticate/disassociate now */ if (tx || frame_buf) ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, reason, tx, frame_buf); /* flush out frame */ if (tx) drv_flush(local, false); /* clear bssid only after building the needed mgmt frames */ memset(ifmgd->bssid, 0, ETH_ALEN); /* remove AP and TDLS peers */ sta_info_flush(local, sdata); /* finally reset all BSS / config parameters */ changed |= ieee80211_reset_erp_info(sdata); ieee80211_led_assoc(local, 0); changed |= BSS_CHANGED_ASSOC; sdata->vif.bss_conf.assoc = false; /* on the next assoc, re-program HT parameters */ memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); local->power_constr_level = 0; del_timer_sync(&local->dynamic_ps_timer); cancel_work_sync(&local->dynamic_ps_enable_work); /* Disable ARP filtering */ if (sdata->vif.bss_conf.arp_filter_enabled) { sdata->vif.bss_conf.arp_filter_enabled = false; changed |= BSS_CHANGED_ARP_FILTER; } sdata->vif.bss_conf.qos = false; changed |= BSS_CHANGED_QOS; /* The BSSID (not really interesting) and HT changed */ changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT; ieee80211_bss_info_change_notify(sdata, changed); /* channel(_type) changes are handled by ieee80211_hw_config */ WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT)); ieee80211_hw_config(local, 0); /* disassociated - set to defaults now */ ieee80211_set_wmm_default(sdata, false); del_timer_sync(&sdata->u.mgd.conn_mon_timer); del_timer_sync(&sdata->u.mgd.bcn_mon_timer); del_timer_sync(&sdata->u.mgd.timer); del_timer_sync(&sdata->u.mgd.chswitch_timer); } void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata, struct ieee80211_hdr *hdr) { /* * We can postpone the mgd.timer whenever receiving unicast frames * from AP because we know that the connection is working both ways * at that time. But multicast frames (and hence also beacons) must * be ignored here, because we need to trigger the timer during * data idle periods for sending the periodic probe request to the * AP we're connected to. */ if (is_multicast_ether_addr(hdr->addr1)) return; ieee80211_sta_reset_conn_monitor(sdata); } static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; mutex_lock(&local->mtx); if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL | IEEE80211_STA_CONNECTION_POLL))) { mutex_unlock(&local->mtx); return; } __ieee80211_stop_poll(sdata); mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) goto out; /* * We've received a probe response, but are not sure whether * we have or will be receiving any beacons or data, so let's * schedule the timers again, just in case. */ ieee80211_sta_reset_beacon_monitor(sdata); mod_timer(&ifmgd->conn_mon_timer, round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME)); out: mutex_unlock(&local->mtx); } void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata, struct ieee80211_hdr *hdr, bool ack) { if (!ieee80211_is_data(hdr->frame_control)) return; if (ack) ieee80211_sta_reset_conn_monitor(sdata); if (ieee80211_is_nullfunc(hdr->frame_control) && sdata->u.mgd.probe_send_count > 0) { if (ack) sdata->u.mgd.probe_send_count = 0; else sdata->u.mgd.nullfunc_failed = true; ieee80211_queue_work(&sdata->local->hw, &sdata->work); } } static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; const u8 *ssid; u8 *dst = ifmgd->associated->bssid; u8 unicast_limit = max(1, max_probe_tries - 3); /* * Try sending broadcast probe requests for the last three * probe requests after the first ones failed since some * buggy APs only support broadcast probe requests. */ if (ifmgd->probe_send_count >= unicast_limit) dst = NULL; /* * When the hardware reports an accurate Tx ACK status, it's * better to send a nullfunc frame instead of a probe request, * as it will kick us off the AP quickly if we aren't associated * anymore. The timeout will be reset if the frame is ACKed by * the AP. */ ifmgd->probe_send_count++; if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { ifmgd->nullfunc_failed = false; ieee80211_send_nullfunc(sdata->local, sdata, 0); } else { int ssid_len; ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID); if (WARN_ON_ONCE(ssid == NULL)) ssid_len = 0; else ssid_len = ssid[1]; ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL, 0, (u32) -1, true, false); } ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms); run_again(ifmgd, ifmgd->probe_timeout); if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) drv_flush(sdata->local, false); } static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata, bool beacon) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; bool already = false; if (!ieee80211_sdata_running(sdata)) return; mutex_lock(&ifmgd->mtx); if (!ifmgd->associated) goto out; mutex_lock(&sdata->local->mtx); if (sdata->local->tmp_channel || sdata->local->scanning) { mutex_unlock(&sdata->local->mtx); goto out; } if (beacon) mlme_dbg_ratelimited(sdata, "detected beacon loss from AP - sending probe request\n"); ieee80211_cqm_rssi_notify(&sdata->vif, NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL); /* * The driver/our work has already reported this event or the * connection monitoring has kicked in and we have already sent * a probe request. Or maybe the AP died and the driver keeps * reporting until we disassociate... * * In either case we have to ignore the current call to this * function (except for setting the correct probe reason bit) * because otherwise we would reset the timer every time and * never check whether we received a probe response! */ if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | IEEE80211_STA_CONNECTION_POLL)) already = true; if (beacon) ifmgd->flags |= IEEE80211_STA_BEACON_POLL; else ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL; mutex_unlock(&sdata->local->mtx); if (already) goto out; mutex_lock(&sdata->local->iflist_mtx); ieee80211_recalc_ps(sdata->local, -1); mutex_unlock(&sdata->local->iflist_mtx); ifmgd->probe_send_count = 0; ieee80211_mgd_probe_ap_send(sdata); out: mutex_unlock(&ifmgd->mtx); } struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct cfg80211_bss *cbss; struct sk_buff *skb; const u8 *ssid; int ssid_len; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) return NULL; ASSERT_MGD_MTX(ifmgd); if (ifmgd->associated) cbss = ifmgd->associated; else if (ifmgd->auth_data) cbss = ifmgd->auth_data->bss; else if (ifmgd->assoc_data) cbss = ifmgd->assoc_data->bss; else return NULL; ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID); if (WARN_ON_ONCE(ssid == NULL)) ssid_len = 0; else ssid_len = ssid[1]; skb = ieee80211_build_probe_req(sdata, cbss->bssid, (u32) -1, ssid + 2, ssid_len, NULL, 0, true); return skb; } EXPORT_SYMBOL(ieee80211_ap_probereq_get); static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; u8 bssid[ETH_ALEN]; u8 frame_buf[DEAUTH_DISASSOC_LEN]; mutex_lock(&ifmgd->mtx); if (!ifmgd->associated) { mutex_unlock(&ifmgd->mtx); return; } memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); sdata_info(sdata, "Connection to AP %pM lost\n", bssid); ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false, frame_buf); mutex_unlock(&ifmgd->mtx); /* * must be outside lock due to cfg80211, * but that's not a problem. */ cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); mutex_lock(&local->mtx); ieee80211_recalc_idle(local); mutex_unlock(&local->mtx); } void ieee80211_beacon_connection_loss_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.beacon_connection_loss_work); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct sta_info *sta; if (ifmgd->associated) { rcu_read_lock(); sta = sta_info_get(sdata, ifmgd->bssid); if (sta) sta->beacon_loss_count++; rcu_read_unlock(); } if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) __ieee80211_connection_loss(sdata); else ieee80211_mgd_probe_ap(sdata, true); } void ieee80211_beacon_loss(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_hw *hw = &sdata->local->hw; trace_api_beacon_loss(sdata); WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR); ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); } EXPORT_SYMBOL(ieee80211_beacon_loss); void ieee80211_connection_loss(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_hw *hw = &sdata->local->hw; trace_api_connection_loss(sdata); WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR)); ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work); } EXPORT_SYMBOL(ieee80211_connection_loss); static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata, bool assoc) { struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; lockdep_assert_held(&sdata->u.mgd.mtx); if (!assoc) { sta_info_destroy_addr(sdata, auth_data->bss->bssid); memset(sdata->u.mgd.bssid, 0, ETH_ALEN); ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); } cfg80211_put_bss(auth_data->bss); kfree(auth_data); sdata->u.mgd.auth_data = NULL; } static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; u8 *pos; struct ieee802_11_elems elems; pos = mgmt->u.auth.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); if (!elems.challenge) return; auth_data->expected_transaction = 4; drv_mgd_prepare_tx(sdata->local, sdata); ieee80211_send_auth(sdata, 3, auth_data->algorithm, elems.challenge - 2, elems.challenge_len + 2, auth_data->bss->bssid, auth_data->bss->bssid, auth_data->key, auth_data->key_len, auth_data->key_idx); } static enum rx_mgmt_action __must_check ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 bssid[ETH_ALEN]; u16 auth_alg, auth_transaction, status_code; struct sta_info *sta; lockdep_assert_held(&ifmgd->mtx); if (len < 24 + 6) return RX_MGMT_NONE; if (!ifmgd->auth_data || ifmgd->auth_data->done) return RX_MGMT_NONE; memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); if (!ether_addr_equal(bssid, mgmt->bssid)) return RX_MGMT_NONE; auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); status_code = le16_to_cpu(mgmt->u.auth.status_code); if (auth_alg != ifmgd->auth_data->algorithm || auth_transaction != ifmgd->auth_data->expected_transaction) return RX_MGMT_NONE; if (status_code != WLAN_STATUS_SUCCESS) { sdata_info(sdata, "%pM denied authentication (status %d)\n", mgmt->sa, status_code); ieee80211_destroy_auth_data(sdata, false); return RX_MGMT_CFG80211_RX_AUTH; } switch (ifmgd->auth_data->algorithm) { case WLAN_AUTH_OPEN: case WLAN_AUTH_LEAP: case WLAN_AUTH_FT: break; case WLAN_AUTH_SHARED_KEY: if (ifmgd->auth_data->expected_transaction != 4) { ieee80211_auth_challenge(sdata, mgmt, len); /* need another frame */ return RX_MGMT_NONE; } break; default: WARN_ONCE(1, "invalid auth alg %d", ifmgd->auth_data->algorithm); return RX_MGMT_NONE; } sdata_info(sdata, "authenticated\n"); ifmgd->auth_data->done = true; ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC; run_again(ifmgd, ifmgd->auth_data->timeout); /* move station state to auth */ mutex_lock(&sdata->local->sta_mtx); sta = sta_info_get(sdata, bssid); if (!sta) { WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid); goto out_err; } if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) { sdata_info(sdata, "failed moving %pM to auth\n", bssid); goto out_err; } mutex_unlock(&sdata->local->sta_mtx); return RX_MGMT_CFG80211_RX_AUTH; out_err: mutex_unlock(&sdata->local->sta_mtx); /* ignore frame -- wait for timeout */ return RX_MGMT_NONE; } static enum rx_mgmt_action __must_check ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; const u8 *bssid = NULL; u16 reason_code; lockdep_assert_held(&ifmgd->mtx); if (len < 24 + 2) return RX_MGMT_NONE; if (!ifmgd->associated || !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) return RX_MGMT_NONE; bssid = ifmgd->associated->bssid; reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n", bssid, reason_code); ieee80211_set_disassoc(sdata, 0, 0, false, NULL); mutex_lock(&sdata->local->mtx); ieee80211_recalc_idle(sdata->local); mutex_unlock(&sdata->local->mtx); return RX_MGMT_CFG80211_DEAUTH; } static enum rx_mgmt_action __must_check ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u16 reason_code; lockdep_assert_held(&ifmgd->mtx); if (len < 24 + 2) return RX_MGMT_NONE; if (!ifmgd->associated || !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) return RX_MGMT_NONE; reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); sdata_info(sdata, "disassociated from %pM (Reason: %u)\n", mgmt->sa, reason_code); ieee80211_set_disassoc(sdata, 0, 0, false, NULL); mutex_lock(&sdata->local->mtx); ieee80211_recalc_idle(sdata->local); mutex_unlock(&sdata->local->mtx); return RX_MGMT_CFG80211_DISASSOC; } static void ieee80211_get_rates(struct ieee80211_supported_band *sband, u8 *supp_rates, unsigned int supp_rates_len, u32 *rates, u32 *basic_rates, bool *have_higher_than_11mbit, int *min_rate, int *min_rate_index) { int i, j; for (i = 0; i < supp_rates_len; i++) { int rate = (supp_rates[i] & 0x7f) * 5; bool is_basic = !!(supp_rates[i] & 0x80); if (rate > 110) *have_higher_than_11mbit = true; /* * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it. * * Note: Even through the membership selector and the basic * rate flag share the same bit, they are not exactly * the same. */ if (!!(supp_rates[i] & 0x80) && (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY) continue; for (j = 0; j < sband->n_bitrates; j++) { if (sband->bitrates[j].bitrate == rate) { *rates |= BIT(j); if (is_basic) *basic_rates |= BIT(j); if (rate < *min_rate) { *min_rate = rate; *min_rate_index = j; } break; } } } } static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata, bool assoc) { struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; lockdep_assert_held(&sdata->u.mgd.mtx); if (!assoc) { sta_info_destroy_addr(sdata, assoc_data->bss->bssid); memset(sdata->u.mgd.bssid, 0, ETH_ALEN); ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID); } kfree(assoc_data); sdata->u.mgd.assoc_data = NULL; } static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata, struct cfg80211_bss *cbss, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sta_info *sta; u8 *pos; u16 capab_info, aid; struct ieee802_11_elems elems; struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; u32 changed = 0; int err; /* AssocResp and ReassocResp have identical structure */ aid = le16_to_cpu(mgmt->u.assoc_resp.aid); capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n", aid); aid &= ~(BIT(15) | BIT(14)); ifmgd->broken_ap = false; if (aid == 0 || aid > IEEE80211_MAX_AID) { sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n", aid); aid = 0; ifmgd->broken_ap = true; } pos = mgmt->u.assoc_resp.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); if (!elems.supp_rates) { sdata_info(sdata, "no SuppRates element in AssocResp\n"); return false; } ifmgd->aid = aid; mutex_lock(&sdata->local->sta_mtx); /* * station info was already allocated and inserted before * the association and should be available to us */ sta = sta_info_get(sdata, cbss->bssid); if (WARN_ON(!sta)) { mutex_unlock(&sdata->local->sta_mtx); return false; } sband = local->hw.wiphy->bands[local->oper_channel->band]; if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, elems.ht_cap_elem, &sta->sta.ht_cap); sta->supports_40mhz = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40; rate_control_rate_init(sta); if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) set_sta_flag(sta, WLAN_STA_MFP); if (elems.wmm_param) set_sta_flag(sta, WLAN_STA_WME); err = sta_info_move_state(sta, IEEE80211_STA_AUTH); if (!err) err = sta_info_move_state(sta, IEEE80211_STA_ASSOC); if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED); if (err) { sdata_info(sdata, "failed to move station %pM to desired state\n", sta->sta.addr); WARN_ON(__sta_info_destroy(sta)); mutex_unlock(&sdata->local->sta_mtx); return false; } mutex_unlock(&sdata->local->sta_mtx); /* * Always handle WMM once after association regardless * of the first value the AP uses. Setting -1 here has * that effect because the AP values is an unsigned * 4-bit value. */ ifmgd->wmm_last_param_set = -1; if (elems.wmm_param) ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, elems.wmm_param_len); else ieee80211_set_wmm_default(sdata, false); changed |= BSS_CHANGED_QOS; if (elems.ht_operation && elems.wmm_param && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, cbss->bssid, false); /* set AID and assoc capability, * ieee80211_set_associated() will tell the driver */ bss_conf->aid = aid; bss_conf->assoc_capability = capab_info; ieee80211_set_associated(sdata, cbss, changed); /* * If we're using 4-addr mode, let the AP know that we're * doing so, so that it can create the STA VLAN on its side */ if (ifmgd->use_4addr) ieee80211_send_4addr_nullfunc(local, sdata); /* * Start timer to probe the connection to the AP now. * Also start the timer that will detect beacon loss. */ ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt); ieee80211_sta_reset_beacon_monitor(sdata); return true; } static enum rx_mgmt_action __must_check ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct cfg80211_bss **bss) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data; u16 capab_info, status_code, aid; struct ieee802_11_elems elems; u8 *pos; bool reassoc; lockdep_assert_held(&ifmgd->mtx); if (!assoc_data) return RX_MGMT_NONE; if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid)) return RX_MGMT_NONE; /* * AssocResp and ReassocResp have identical structure, so process both * of them in this function. */ if (len < 24 + 6) return RX_MGMT_NONE; reassoc = ieee80211_is_reassoc_req(mgmt->frame_control); capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); aid = le16_to_cpu(mgmt->u.assoc_resp.aid); sdata_info(sdata, "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n", reassoc ? "Rea" : "A", mgmt->sa, capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); pos = mgmt->u.assoc_resp.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY && elems.timeout_int && elems.timeout_int_len == 5 && elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) { u32 tu, ms; tu = get_unaligned_le32(elems.timeout_int + 1); ms = tu * 1024 / 1000; sdata_info(sdata, "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n", mgmt->sa, tu, ms); assoc_data->timeout = jiffies + msecs_to_jiffies(ms); if (ms > IEEE80211_ASSOC_TIMEOUT) run_again(ifmgd, assoc_data->timeout); return RX_MGMT_NONE; } *bss = assoc_data->bss; if (status_code != WLAN_STATUS_SUCCESS) { sdata_info(sdata, "%pM denied association (code=%d)\n", mgmt->sa, status_code); ieee80211_destroy_assoc_data(sdata, false); } else { if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) { /* oops -- internal error -- send timeout for now */ ieee80211_destroy_assoc_data(sdata, false); cfg80211_put_bss(*bss); return RX_MGMT_CFG80211_ASSOC_TIMEOUT; } sdata_info(sdata, "associated\n"); /* * destroy assoc_data afterwards, as otherwise an idle * recalc after assoc_data is NULL but before associated * is set can cause the interface to go idle */ ieee80211_destroy_assoc_data(sdata, true); } return RX_MGMT_CFG80211_RX_ASSOC; } static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status, struct ieee802_11_elems *elems, bool beacon) { struct ieee80211_local *local = sdata->local; int freq; struct ieee80211_bss *bss; struct ieee80211_channel *channel; bool need_ps = false; if (sdata->u.mgd.associated && ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) { bss = (void *)sdata->u.mgd.associated->priv; /* not previously set so we may need to recalc */ need_ps = !bss->dtim_period; } if (elems->ds_params && elems->ds_params_len == 1) freq = ieee80211_channel_to_frequency(elems->ds_params[0], rx_status->band); else freq = rx_status->freq; channel = ieee80211_get_channel(local->hw.wiphy, freq); if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) return; bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, channel, beacon); if (bss) ieee80211_rx_bss_put(local, bss); if (!sdata->u.mgd.associated) return; if (need_ps) { mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); } if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)) { struct ieee80211_channel_sw_ie *sw_elem = (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem; ieee80211_sta_process_chanswitch(sdata, sw_elem, bss, rx_status->mactime); } } static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_mgmt *mgmt = (void *)skb->data; struct ieee80211_if_managed *ifmgd; struct ieee80211_rx_status *rx_status = (void *) skb->cb; size_t baselen, len = skb->len; struct ieee802_11_elems elems; ifmgd = &sdata->u.mgd; ASSERT_MGD_MTX(ifmgd); if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) return; /* ignore ProbeResp to foreign address */ baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; if (baselen > len) return; ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); if (ifmgd->associated && ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) ieee80211_reset_ap_probe(sdata); if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies && ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) { /* got probe response, continue with auth */ sdata_info(sdata, "direct probe responded\n"); ifmgd->auth_data->tries = 0; ifmgd->auth_data->timeout = jiffies; run_again(ifmgd, ifmgd->auth_data->timeout); } } /* * This is the canonical list of information elements we care about, * the filter code also gives us all changes to the Microsoft OUI * (00:50:F2) vendor IE which is used for WMM which we need to track. * * We implement beacon filtering in software since that means we can * avoid processing the frame here and in cfg80211, and userspace * will not be able to tell whether the hardware supports it or not. * * XXX: This list needs to be dynamic -- userspace needs to be able to * add items it requires. It also needs to be able to tell us to * look out for other vendor IEs. */ static const u64 care_about_ies = (1ULL << WLAN_EID_COUNTRY) | (1ULL << WLAN_EID_ERP_INFO) | (1ULL << WLAN_EID_CHANNEL_SWITCH) | (1ULL << WLAN_EID_PWR_CONSTRAINT) | (1ULL << WLAN_EID_HT_CAPABILITY) | (1ULL << WLAN_EID_HT_OPERATION); static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; size_t baselen; struct ieee802_11_elems elems; struct ieee80211_local *local = sdata->local; u32 changed = 0; bool erp_valid, directed_tim = false; u8 erp_value = 0; u32 ncrc; u8 *bssid; lockdep_assert_held(&ifmgd->mtx); /* Process beacon from the current BSS */ baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; if (baselen > len) return; if (rx_status->freq != local->hw.conf.channel->center_freq) return; if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon && ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) { ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); ifmgd->assoc_data->have_beacon = true; ifmgd->assoc_data->sent_assoc = false; /* continue assoc process */ ifmgd->assoc_data->timeout = jiffies; run_again(ifmgd, ifmgd->assoc_data->timeout); return; } if (!ifmgd->associated || !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) return; bssid = ifmgd->associated->bssid; /* Track average RSSI from the Beacon frames of the current AP */ ifmgd->last_beacon_signal = rx_status->signal; if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) { ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE; ifmgd->ave_beacon_signal = rx_status->signal * 16; ifmgd->last_cqm_event_signal = 0; ifmgd->count_beacon_signal = 1; ifmgd->last_ave_beacon_signal = 0; } else { ifmgd->ave_beacon_signal = (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 + (16 - IEEE80211_SIGNAL_AVE_WEIGHT) * ifmgd->ave_beacon_signal) / 16; ifmgd->count_beacon_signal++; } if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold && ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) { int sig = ifmgd->ave_beacon_signal; int last_sig = ifmgd->last_ave_beacon_signal; /* * if signal crosses either of the boundaries, invoke callback * with appropriate parameters */ if (sig > ifmgd->rssi_max_thold && (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) { ifmgd->last_ave_beacon_signal = sig; drv_rssi_callback(local, RSSI_EVENT_HIGH); } else if (sig < ifmgd->rssi_min_thold && (last_sig >= ifmgd->rssi_max_thold || last_sig == 0)) { ifmgd->last_ave_beacon_signal = sig; drv_rssi_callback(local, RSSI_EVENT_LOW); } } if (bss_conf->cqm_rssi_thold && ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT && !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) { int sig = ifmgd->ave_beacon_signal / 16; int last_event = ifmgd->last_cqm_event_signal; int thold = bss_conf->cqm_rssi_thold; int hyst = bss_conf->cqm_rssi_hyst; if (sig < thold && (last_event == 0 || sig < last_event - hyst)) { ifmgd->last_cqm_event_signal = sig; ieee80211_cqm_rssi_notify( &sdata->vif, NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW, GFP_KERNEL); } else if (sig > thold && (last_event == 0 || sig > last_event + hyst)) { ifmgd->last_cqm_event_signal = sig; ieee80211_cqm_rssi_notify( &sdata->vif, NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH, GFP_KERNEL); } } if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) { mlme_dbg_ratelimited(sdata, "cancelling probereq poll due to a received beacon\n"); mutex_lock(&local->mtx); ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL; ieee80211_run_deferred_scan(local); mutex_unlock(&local->mtx); mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); } /* * Push the beacon loss detection into the future since * we are processing a beacon from the AP just now. */ ieee80211_sta_reset_beacon_monitor(sdata); ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4); ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable, len - baselen, &elems, care_about_ies, ncrc); if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid); if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { if (directed_tim) { if (local->hw.conf.dynamic_ps_timeout > 0) { if (local->hw.conf.flags & IEEE80211_CONF_PS) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); } ieee80211_send_nullfunc(local, sdata, 0); } else if (!local->pspolling && sdata->u.mgd.powersave) { local->pspolling = true; /* * Here is assumed that the driver will be * able to send ps-poll frame and receive a * response even though power save mode is * enabled, but some drivers might require * to disable power save here. This needs * to be investigated. */ ieee80211_send_pspoll(local, sdata); } } } if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid) return; ifmgd->beacon_crc = ncrc; ifmgd->beacon_crc_valid = true; ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param, elems.wmm_param_len)) changed |= BSS_CHANGED_QOS; if (elems.erp_info && elems.erp_info_len >= 1) { erp_valid = true; erp_value = elems.erp_info[0]; } else { erp_valid = false; } changed |= ieee80211_handle_bss_capability(sdata, le16_to_cpu(mgmt->u.beacon.capab_info), erp_valid, erp_value); if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) { struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation, bssid, true); } /* Note: country IE parsing is done for us by cfg80211 */ if (elems.country_elem) { /* TODO: IBSS also needs this */ if (elems.pwr_constr_elem) ieee80211_handle_pwr_constr(sdata, le16_to_cpu(mgmt->u.probe_resp.capab_info), elems.pwr_constr_elem, elems.pwr_constr_elem_len); } ieee80211_bss_info_change_notify(sdata, changed); } void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_rx_status *rx_status; struct ieee80211_mgmt *mgmt; struct cfg80211_bss *bss = NULL; enum rx_mgmt_action rma = RX_MGMT_NONE; u16 fc; rx_status = (struct ieee80211_rx_status *) skb->cb; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); mutex_lock(&ifmgd->mtx); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_BEACON: ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_PROBE_RESP: ieee80211_rx_mgmt_probe_resp(sdata, skb); break; case IEEE80211_STYPE_AUTH: rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_DEAUTH: rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_DISASSOC: rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_ASSOC_RESP: case IEEE80211_STYPE_REASSOC_RESP: rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss); break; case IEEE80211_STYPE_ACTION: switch (mgmt->u.action.category) { case WLAN_CATEGORY_SPECTRUM_MGMT: ieee80211_sta_process_chanswitch(sdata, &mgmt->u.action.u.chan_switch.sw_elem, (void *)ifmgd->associated->priv, rx_status->mactime); break; } } mutex_unlock(&ifmgd->mtx); switch (rma) { case RX_MGMT_NONE: /* no action */ break; case RX_MGMT_CFG80211_DEAUTH: cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len); break; case RX_MGMT_CFG80211_DISASSOC: cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len); break; case RX_MGMT_CFG80211_RX_AUTH: cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len); break; case RX_MGMT_CFG80211_RX_ASSOC: cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len); break; case RX_MGMT_CFG80211_ASSOC_TIMEOUT: cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid); break; default: WARN(1, "unexpected: %d", rma); } } static void ieee80211_sta_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; if (local->quiescing) { set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); return; } ieee80211_queue_work(&local->hw, &sdata->work); } static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata, u8 *bssid, u8 reason) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 frame_buf[DEAUTH_DISASSOC_LEN]; ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason, false, frame_buf); mutex_unlock(&ifmgd->mtx); /* * must be outside lock due to cfg80211, * but that's not a problem. */ cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); mutex_lock(&local->mtx); ieee80211_recalc_idle(local); mutex_unlock(&local->mtx); mutex_lock(&ifmgd->mtx); } static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data; lockdep_assert_held(&ifmgd->mtx); if (WARN_ON_ONCE(!auth_data)) return -EINVAL; auth_data->tries++; if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) { sdata_info(sdata, "authentication with %pM timed out\n", auth_data->bss->bssid); /* * Most likely AP is not in the range so remove the * bss struct for that AP. */ cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss); return -ETIMEDOUT; } drv_mgd_prepare_tx(local, sdata); if (auth_data->bss->proberesp_ies) { sdata_info(sdata, "send auth to %pM (try %d/%d)\n", auth_data->bss->bssid, auth_data->tries, IEEE80211_AUTH_MAX_TRIES); auth_data->expected_transaction = 2; ieee80211_send_auth(sdata, 1, auth_data->algorithm, auth_data->ie, auth_data->ie_len, auth_data->bss->bssid, auth_data->bss->bssid, NULL, 0, 0); } else { const u8 *ssidie; sdata_info(sdata, "direct probe to %pM (try %d/%i)\n", auth_data->bss->bssid, auth_data->tries, IEEE80211_AUTH_MAX_TRIES); ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID); if (!ssidie) return -EINVAL; /* * Direct probe is sent to broadcast address as some APs * will not answer to direct packet in unassociated state. */ ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1], NULL, 0, (u32) -1, true, false); } auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT; run_again(ifmgd, auth_data->timeout); return 0; } static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata) { struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data; struct ieee80211_local *local = sdata->local; lockdep_assert_held(&sdata->u.mgd.mtx); assoc_data->tries++; if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) { sdata_info(sdata, "association with %pM timed out\n", assoc_data->bss->bssid); /* * Most likely AP is not in the range so remove the * bss struct for that AP. */ cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss); return -ETIMEDOUT; } sdata_info(sdata, "associate with %pM (try %d/%d)\n", assoc_data->bss->bssid, assoc_data->tries, IEEE80211_ASSOC_MAX_TRIES); ieee80211_send_assoc(sdata); assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT; run_again(&sdata->u.mgd, assoc_data->timeout); return 0; } void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; mutex_lock(&ifmgd->mtx); if (ifmgd->auth_data && time_after(jiffies, ifmgd->auth_data->timeout)) { if (ifmgd->auth_data->done) { /* * ok ... we waited for assoc but userspace didn't, * so let's just kill the auth data */ ieee80211_destroy_auth_data(sdata, false); } else if (ieee80211_probe_auth(sdata)) { u8 bssid[ETH_ALEN]; memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN); ieee80211_destroy_auth_data(sdata, false); mutex_unlock(&ifmgd->mtx); cfg80211_send_auth_timeout(sdata->dev, bssid); mutex_lock(&ifmgd->mtx); } } else if (ifmgd->auth_data) run_again(ifmgd, ifmgd->auth_data->timeout); if (ifmgd->assoc_data && time_after(jiffies, ifmgd->assoc_data->timeout)) { if (!ifmgd->assoc_data->have_beacon || ieee80211_do_assoc(sdata)) { u8 bssid[ETH_ALEN]; memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN); ieee80211_destroy_assoc_data(sdata, false); mutex_unlock(&ifmgd->mtx); cfg80211_send_assoc_timeout(sdata->dev, bssid); mutex_lock(&ifmgd->mtx); } } else if (ifmgd->assoc_data) run_again(ifmgd, ifmgd->assoc_data->timeout); if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL | IEEE80211_STA_CONNECTION_POLL) && ifmgd->associated) { u8 bssid[ETH_ALEN]; int max_tries; memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN); if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) max_tries = max_nullfunc_tries; else max_tries = max_probe_tries; /* ACK received for nullfunc probing frame */ if (!ifmgd->probe_send_count) ieee80211_reset_ap_probe(sdata); else if (ifmgd->nullfunc_failed) { if (ifmgd->probe_send_count < max_tries) { mlme_dbg(sdata, "No ack for nullfunc frame to AP %pM, try %d/%i\n", bssid, ifmgd->probe_send_count, max_tries); ieee80211_mgd_probe_ap_send(sdata); } else { mlme_dbg(sdata, "No ack for nullfunc frame to AP %pM, disconnecting.\n", bssid); ieee80211_sta_connection_lost(sdata, bssid, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); } } else if (time_is_after_jiffies(ifmgd->probe_timeout)) run_again(ifmgd, ifmgd->probe_timeout); else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { mlme_dbg(sdata, "Failed to send nullfunc to AP %pM after %dms, disconnecting\n", bssid, probe_wait_ms); ieee80211_sta_connection_lost(sdata, bssid, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); } else if (ifmgd->probe_send_count < max_tries) { mlme_dbg(sdata, "No probe response from AP %pM after %dms, try %d/%i\n", bssid, probe_wait_ms, ifmgd->probe_send_count, max_tries); ieee80211_mgd_probe_ap_send(sdata); } else { /* * We actually lost the connection ... or did we? * Let's make sure! */ wiphy_debug(local->hw.wiphy, "%s: No probe response from AP %pM" " after %dms, disconnecting.\n", sdata->name, bssid, probe_wait_ms); ieee80211_sta_connection_lost(sdata, bssid, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY); } } mutex_unlock(&ifmgd->mtx); mutex_lock(&local->mtx); ieee80211_recalc_idle(local); mutex_unlock(&local->mtx); } static void ieee80211_sta_bcn_mon_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_local *local = sdata->local; if (local->quiescing) return; ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_connection_loss_work); } static void ieee80211_sta_conn_mon_timer(unsigned long data) { struct ieee80211_sub_if_data *sdata = (struct ieee80211_sub_if_data *) data; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; if (local->quiescing) return; ieee80211_queue_work(&local->hw, &ifmgd->monitor_work); } static void ieee80211_sta_monitor_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.monitor_work); ieee80211_mgd_probe_ap(sdata, false); } static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) { u32 flags; if (sdata->vif.type == NL80211_IFTYPE_STATION) { __ieee80211_stop_poll(sdata); /* let's probe the connection once */ flags = sdata->local->hw.flags; if (!(flags & IEEE80211_HW_CONNECTION_MONITOR)) ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work); /* and do all the other regular work too */ ieee80211_queue_work(&sdata->local->hw, &sdata->work); } } #ifdef CONFIG_PM void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; /* * we need to use atomic bitops for the running bits * only because both timers might fire at the same * time -- the code here is properly synchronised. */ cancel_work_sync(&ifmgd->request_smps_work); cancel_work_sync(&ifmgd->monitor_work); cancel_work_sync(&ifmgd->beacon_connection_loss_work); if (del_timer_sync(&ifmgd->timer)) set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running); cancel_work_sync(&ifmgd->chswitch_work); if (del_timer_sync(&ifmgd->chswitch_timer)) set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running); /* these will just be re-established on connection */ del_timer_sync(&ifmgd->conn_mon_timer); del_timer_sync(&ifmgd->bcn_mon_timer); } void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (!ifmgd->associated) return; if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) { sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME; mutex_lock(&ifmgd->mtx); if (ifmgd->associated) { mlme_dbg(sdata, "driver requested disconnect after resume\n"); ieee80211_sta_connection_lost(sdata, ifmgd->associated->bssid, WLAN_REASON_UNSPECIFIED); mutex_unlock(&ifmgd->mtx); return; } mutex_unlock(&ifmgd->mtx); } if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running)) add_timer(&ifmgd->timer); if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running)) add_timer(&ifmgd->chswitch_timer); ieee80211_sta_reset_beacon_monitor(sdata); mutex_lock(&sdata->local->mtx); ieee80211_restart_sta_timer(sdata); mutex_unlock(&sdata->local->mtx); } #endif /* interface setup */ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd; ifmgd = &sdata->u.mgd; INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work); INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); INIT_WORK(&ifmgd->beacon_connection_loss_work, ieee80211_beacon_connection_loss_work); INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work); setup_timer(&ifmgd->timer, ieee80211_sta_timer, (unsigned long) sdata); setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, (unsigned long) sdata); setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, (unsigned long) sdata); setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, (unsigned long) sdata); ifmgd->flags = 0; ifmgd->powersave = sdata->wdev.ps; ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; mutex_init(&ifmgd->mtx); if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS) ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC; else ifmgd->req_smps = IEEE80211_SMPS_OFF; } /* scan finished notification */ void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; /* Restart STA timers */ rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) ieee80211_restart_sta_timer(sdata); rcu_read_unlock(); } int ieee80211_max_network_latency(struct notifier_block *nb, unsigned long data, void *dummy) { s32 latency_usec = (s32) data; struct ieee80211_local *local = container_of(nb, struct ieee80211_local, network_latency_notifier); mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, latency_usec); mutex_unlock(&local->iflist_mtx); return 0; } static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata, struct cfg80211_bss *cbss) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; int ht_cfreq; enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; const u8 *ht_oper_ie; const struct ieee80211_ht_operation *ht_oper = NULL; struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[cbss->channel->band]; ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ; if (sband->ht_cap.ht_supported) { ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION, cbss->information_elements, cbss->len_information_elements); if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper)) ht_oper = (void *)(ht_oper_ie + 2); } if (ht_oper) { ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, cbss->channel->band); /* check that channel matches the right operating channel */ if (cbss->channel->center_freq != ht_cfreq) { /* * It's possible that some APs are confused here; * Netgear WNDR3700 sometimes reports 4 higher than * the actual channel in association responses, but * since we look at probe response/beacon data here * it should be OK. */ sdata_info(sdata, "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", cbss->channel->center_freq, ht_cfreq, ht_oper->primary_chan, cbss->channel->band); ht_oper = NULL; } } if (ht_oper) { channel_type = NL80211_CHAN_HT20; if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) { switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: channel_type = NL80211_CHAN_HT40PLUS; break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: channel_type = NL80211_CHAN_HT40MINUS; break; } } } if (!ieee80211_set_channel_type(local, sdata, channel_type)) { /* can only fail due to HT40+/- mismatch */ channel_type = NL80211_CHAN_HT20; sdata_info(sdata, "disabling 40 MHz due to multi-vif mismatch\n"); ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ; WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type)); } local->oper_channel = cbss->channel; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); return 0; } static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata, struct cfg80211_bss *cbss, bool assoc) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_bss *bss = (void *)cbss->priv; struct sta_info *new_sta = NULL; bool have_sta = false; int err; if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data)) return -EINVAL; if (assoc) { rcu_read_lock(); have_sta = sta_info_get(sdata, cbss->bssid); rcu_read_unlock(); } if (!have_sta) { new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL); if (!new_sta) return -ENOMEM; } mutex_lock(&local->mtx); ieee80211_recalc_idle(sdata->local); mutex_unlock(&local->mtx); if (new_sta) { u32 rates = 0, basic_rates = 0; bool have_higher_than_11mbit; int min_rate = INT_MAX, min_rate_index = -1; struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[cbss->channel->band]; err = ieee80211_prep_channel(sdata, cbss); if (err) { sta_info_free(local, new_sta); return err; } ieee80211_get_rates(sband, bss->supp_rates, bss->supp_rates_len, &rates, &basic_rates, &have_higher_than_11mbit, &min_rate, &min_rate_index); /* * This used to be a workaround for basic rates missing * in the association response frame. Now that we no * longer use the basic rates from there, it probably * doesn't happen any more, but keep the workaround so * in case some *other* APs are buggy in different ways * we can connect -- with a warning. */ if (!basic_rates && min_rate_index >= 0) { sdata_info(sdata, "No basic rates, using min rate instead\n"); basic_rates = BIT(min_rate_index); } new_sta->sta.supp_rates[cbss->channel->band] = rates; sdata->vif.bss_conf.basic_rates = basic_rates; /* cf. IEEE 802.11 9.2.12 */ if (local->oper_channel->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; else sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN); /* set timing information */ sdata->vif.bss_conf.beacon_int = cbss->beacon_interval; sdata->vif.bss_conf.sync_tsf = cbss->tsf; sdata->vif.bss_conf.sync_device_ts = bss->device_ts; /* tell driver about BSSID, basic rates and timing */ ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES | BSS_CHANGED_BEACON_INT); if (assoc) sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH); err = sta_info_insert(new_sta); new_sta = NULL; if (err) { sdata_info(sdata, "failed to insert STA entry for the AP (error %d)\n", err); return err; } } else WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid)); return 0; } /* config hooks */ int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, struct cfg80211_auth_request *req) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_mgd_auth_data *auth_data; u16 auth_alg; int err; /* prepare auth data structure */ switch (req->auth_type) { case NL80211_AUTHTYPE_OPEN_SYSTEM: auth_alg = WLAN_AUTH_OPEN; break; case NL80211_AUTHTYPE_SHARED_KEY: if (IS_ERR(local->wep_tx_tfm)) return -EOPNOTSUPP; auth_alg = WLAN_AUTH_SHARED_KEY; break; case NL80211_AUTHTYPE_FT: auth_alg = WLAN_AUTH_FT; break; case NL80211_AUTHTYPE_NETWORK_EAP: auth_alg = WLAN_AUTH_LEAP; break; default: return -EOPNOTSUPP; } auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL); if (!auth_data) return -ENOMEM; auth_data->bss = req->bss; if (req->ie && req->ie_len) { memcpy(auth_data->ie, req->ie, req->ie_len); auth_data->ie_len = req->ie_len; } if (req->key && req->key_len) { auth_data->key_len = req->key_len; auth_data->key_idx = req->key_idx; memcpy(auth_data->key, req->key, req->key_len); } auth_data->algorithm = auth_alg; /* try to authenticate/probe */ mutex_lock(&ifmgd->mtx); if ((ifmgd->auth_data && !ifmgd->auth_data->done) || ifmgd->assoc_data) { err = -EBUSY; goto err_free; } if (ifmgd->auth_data) ieee80211_destroy_auth_data(sdata, false); /* prep auth_data so we don't go into idle on disassoc */ ifmgd->auth_data = auth_data; if (ifmgd->associated) ieee80211_set_disassoc(sdata, 0, 0, false, NULL); sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid); err = ieee80211_prep_connection(sdata, req->bss, false); if (err) goto err_clear; err = ieee80211_probe_auth(sdata); if (err) { sta_info_destroy_addr(sdata, req->bss->bssid); goto err_clear; } /* hold our own reference */ cfg80211_ref_bss(auth_data->bss); err = 0; goto out_unlock; err_clear: ifmgd->auth_data = NULL; err_free: kfree(auth_data); out_unlock: mutex_unlock(&ifmgd->mtx); return err; } int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata, struct cfg80211_assoc_request *req) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_bss *bss = (void *)req->bss->priv; struct ieee80211_mgd_assoc_data *assoc_data; struct ieee80211_supported_band *sband; const u8 *ssidie, *ht_ie; int i, err; ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID); if (!ssidie) return -EINVAL; assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL); if (!assoc_data) return -ENOMEM; mutex_lock(&ifmgd->mtx); if (ifmgd->associated) ieee80211_set_disassoc(sdata, 0, 0, false, NULL); if (ifmgd->auth_data && !ifmgd->auth_data->done) { err = -EBUSY; goto err_free; } if (ifmgd->assoc_data) { err = -EBUSY; goto err_free; } if (ifmgd->auth_data) { bool match; /* keep sta info, bssid if matching */ match = ether_addr_equal(ifmgd->bssid, req->bss->bssid); ieee80211_destroy_auth_data(sdata, match); } /* prepare assoc data */ ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N; ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; ifmgd->flags &= ~IEEE80211_STA_DISABLE_VHT; ifmgd->beacon_crc_valid = false; /* * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode. * We still associate in non-HT mode (11a/b/g) if any one of these * ciphers is configured as pairwise. * We can set this to true for non-11n hardware, that'll be checked * separately along with the peer capabilities. */ for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) { if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 || req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP || req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) { ifmgd->flags |= IEEE80211_STA_DISABLE_11N; ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; netdev_info(sdata->dev, "disabling HT/VHT due to WEP/TKIP use\n"); } } if (req->flags & ASSOC_REQ_DISABLE_HT) { ifmgd->flags |= IEEE80211_STA_DISABLE_11N; ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; } /* Also disable HT if we don't support it or the AP doesn't use WMM */ sband = local->hw.wiphy->bands[req->bss->channel->band]; if (!sband->ht_cap.ht_supported || local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) { ifmgd->flags |= IEEE80211_STA_DISABLE_11N; if (!bss->wmm_used) netdev_info(sdata->dev, "disabling HT as WMM/QoS is not supported by the AP\n"); } /* disable VHT if we don't support it or the AP doesn't use WMM */ if (!sband->vht_cap.vht_supported || local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) { ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; if (!bss->wmm_used) netdev_info(sdata->dev, "disabling VHT as WMM/QoS is not supported by the AP\n"); } memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa)); memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask, sizeof(ifmgd->ht_capa_mask)); if (req->ie && req->ie_len) { memcpy(assoc_data->ie, req->ie, req->ie_len); assoc_data->ie_len = req->ie_len; } assoc_data->bss = req->bss; if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) { if (ifmgd->powersave) ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC; else ifmgd->ap_smps = IEEE80211_SMPS_OFF; } else ifmgd->ap_smps = ifmgd->req_smps; assoc_data->capability = req->bss->capability; assoc_data->wmm = bss->wmm_used && (local->hw.queues >= IEEE80211_NUM_ACS); assoc_data->supp_rates = bss->supp_rates; assoc_data->supp_rates_len = bss->supp_rates_len; ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION); if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation)) assoc_data->ap_ht_param = ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param; else ifmgd->flags |= IEEE80211_STA_DISABLE_11N; if (bss->wmm_used && bss->uapsd_supported && (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) { assoc_data->uapsd = true; ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED; } else { assoc_data->uapsd = false; ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED; } memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]); assoc_data->ssid_len = ssidie[1]; if (req->prev_bssid) memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN); if (req->use_mfp) { ifmgd->mfp = IEEE80211_MFP_REQUIRED; ifmgd->flags |= IEEE80211_STA_MFP_ENABLED; } else { ifmgd->mfp = IEEE80211_MFP_DISABLED; ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED; } if (req->crypto.control_port) ifmgd->flags |= IEEE80211_STA_CONTROL_PORT; else ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT; sdata->control_port_protocol = req->crypto.control_port_ethertype; sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt; /* kick off associate process */ ifmgd->assoc_data = assoc_data; err = ieee80211_prep_connection(sdata, req->bss, true); if (err) goto err_clear; if (!bss->dtim_period && sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) { /* * Wait up to one beacon interval ... * should this be more if we miss one? */ sdata_info(sdata, "waiting for beacon from %pM\n", ifmgd->bssid); assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval); } else { assoc_data->have_beacon = true; assoc_data->sent_assoc = false; assoc_data->timeout = jiffies; } run_again(ifmgd, assoc_data->timeout); if (bss->corrupt_data) { char *corrupt_type = "data"; if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) { if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) corrupt_type = "beacon and probe response"; else corrupt_type = "beacon"; } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) corrupt_type = "probe response"; sdata_info(sdata, "associating with AP with corrupt %s\n", corrupt_type); } err = 0; goto out; err_clear: ifmgd->assoc_data = NULL; err_free: kfree(assoc_data); out: mutex_unlock(&ifmgd->mtx); return err; } int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, struct cfg80211_deauth_request *req) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 frame_buf[DEAUTH_DISASSOC_LEN]; mutex_lock(&ifmgd->mtx); if (ifmgd->auth_data) { ieee80211_destroy_auth_data(sdata, false); mutex_unlock(&ifmgd->mtx); return 0; } sdata_info(sdata, "deauthenticating from %pM by local choice (reason=%d)\n", req->bssid, req->reason_code); if (ifmgd->associated && ether_addr_equal(ifmgd->associated->bssid, req->bssid)) { ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, req->reason_code, true, frame_buf); } else { drv_mgd_prepare_tx(sdata->local, sdata); ieee80211_send_deauth_disassoc(sdata, req->bssid, IEEE80211_STYPE_DEAUTH, req->reason_code, true, frame_buf); } mutex_unlock(&ifmgd->mtx); __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); mutex_lock(&sdata->local->mtx); ieee80211_recalc_idle(sdata->local); mutex_unlock(&sdata->local->mtx); return 0; } int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, struct cfg80211_disassoc_request *req) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 bssid[ETH_ALEN]; u8 frame_buf[DEAUTH_DISASSOC_LEN]; mutex_lock(&ifmgd->mtx); /* * cfg80211 should catch this ... but it's racy since * we can receive a disassoc frame, process it, hand it * to cfg80211 while that's in a locked section already * trying to tell us that the user wants to disconnect. */ if (ifmgd->associated != req->bss) { mutex_unlock(&ifmgd->mtx); return -ENOLINK; } sdata_info(sdata, "disassociating from %pM by local choice (reason=%d)\n", req->bss->bssid, req->reason_code); memcpy(bssid, req->bss->bssid, ETH_ALEN); ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC, req->reason_code, !req->local_state_change, frame_buf); mutex_unlock(&ifmgd->mtx); __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN); mutex_lock(&sdata->local->mtx); ieee80211_recalc_idle(sdata->local); mutex_unlock(&sdata->local->mtx); return 0; } void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; mutex_lock(&ifmgd->mtx); if (ifmgd->assoc_data) ieee80211_destroy_assoc_data(sdata, false); if (ifmgd->auth_data) ieee80211_destroy_auth_data(sdata, false); del_timer_sync(&ifmgd->timer); mutex_unlock(&ifmgd->mtx); } void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, enum nl80211_cqm_rssi_threshold_event rssi_event, gfp_t gfp) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); trace_api_cqm_rssi_notify(sdata, rssi_event); cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp); } EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);