/* * 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_TIMEOUT_SHORT (HZ / 10) #define IEEE80211_AUTH_MAX_TRIES 3 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5) #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) #define IEEE80211_ASSOC_TIMEOUT_SHORT (HZ / 10) #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. */ static int beacon_loss_count = 7; module_param(beacon_loss_count, int, 0644); MODULE_PARM_DESC(beacon_loss_count, "Number of beacon intervals before we decide beacon was lost."); /* * 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 /* * 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, /* used when a processed beacon causes a deauth */ RX_MGMT_CFG80211_TX_DEAUTH, }; /* 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 chandef_downgrade(struct cfg80211_chan_def *c) { u32 ret; int tmp; switch (c->width) { case NL80211_CHAN_WIDTH_20: c->width = NL80211_CHAN_WIDTH_20_NOHT; ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; break; case NL80211_CHAN_WIDTH_40: c->width = NL80211_CHAN_WIDTH_20; c->center_freq1 = c->chan->center_freq; ret = IEEE80211_STA_DISABLE_40MHZ | IEEE80211_STA_DISABLE_VHT; break; case NL80211_CHAN_WIDTH_80: tmp = (30 + c->chan->center_freq - c->center_freq1)/20; /* n_P40 */ tmp /= 2; /* freq_P40 */ c->center_freq1 = c->center_freq1 - 20 + 40 * tmp; c->width = NL80211_CHAN_WIDTH_40; ret = IEEE80211_STA_DISABLE_VHT; break; case NL80211_CHAN_WIDTH_80P80: c->center_freq2 = 0; c->width = NL80211_CHAN_WIDTH_80; ret = IEEE80211_STA_DISABLE_80P80MHZ | IEEE80211_STA_DISABLE_160MHZ; break; case NL80211_CHAN_WIDTH_160: /* n_P20 */ tmp = (70 + c->chan->center_freq - c->center_freq1)/20; /* n_P80 */ tmp /= 4; c->center_freq1 = c->center_freq1 - 40 + 80 * tmp; c->width = NL80211_CHAN_WIDTH_80; ret = IEEE80211_STA_DISABLE_80P80MHZ | IEEE80211_STA_DISABLE_160MHZ; break; default: case NL80211_CHAN_WIDTH_20_NOHT: WARN_ON_ONCE(1); c->width = NL80211_CHAN_WIDTH_20_NOHT; ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; break; } WARN_ON_ONCE(!cfg80211_chandef_valid(c)); return ret; } static u32 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata, struct ieee80211_supported_band *sband, struct ieee80211_channel *channel, const struct ieee80211_ht_operation *ht_oper, const struct ieee80211_vht_operation *vht_oper, struct cfg80211_chan_def *chandef, bool verbose) { struct cfg80211_chan_def vht_chandef; u32 ht_cfreq, ret; chandef->chan = channel; chandef->width = NL80211_CHAN_WIDTH_20_NOHT; chandef->center_freq1 = channel->center_freq; chandef->center_freq2 = 0; if (!ht_oper || !sband->ht_cap.ht_supported) { ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; goto out; } chandef->width = NL80211_CHAN_WIDTH_20; ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan, channel->band); /* check that channel matches the right operating channel */ if (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. */ if (verbose) sdata_info(sdata, "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n", channel->center_freq, ht_cfreq, ht_oper->primary_chan, channel->band); ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; goto out; } /* check 40 MHz support, if we have it */ 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: chandef->width = NL80211_CHAN_WIDTH_40; chandef->center_freq1 += 10; break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: chandef->width = NL80211_CHAN_WIDTH_40; chandef->center_freq1 -= 10; break; } } else { /* 40 MHz (and 80 MHz) must be supported for VHT */ ret = IEEE80211_STA_DISABLE_VHT; /* also mark 40 MHz disabled */ ret |= IEEE80211_STA_DISABLE_40MHZ; goto out; } if (!vht_oper || !sband->vht_cap.vht_supported) { ret = IEEE80211_STA_DISABLE_VHT; goto out; } vht_chandef.chan = channel; vht_chandef.center_freq1 = ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx, channel->band); vht_chandef.center_freq2 = 0; switch (vht_oper->chan_width) { case IEEE80211_VHT_CHANWIDTH_USE_HT: vht_chandef.width = chandef->width; break; case IEEE80211_VHT_CHANWIDTH_80MHZ: vht_chandef.width = NL80211_CHAN_WIDTH_80; break; case IEEE80211_VHT_CHANWIDTH_160MHZ: vht_chandef.width = NL80211_CHAN_WIDTH_160; break; case IEEE80211_VHT_CHANWIDTH_80P80MHZ: vht_chandef.width = NL80211_CHAN_WIDTH_80P80; vht_chandef.center_freq2 = ieee80211_channel_to_frequency( vht_oper->center_freq_seg2_idx, channel->band); break; default: if (verbose) sdata_info(sdata, "AP VHT operation IE has invalid channel width (%d), disable VHT\n", vht_oper->chan_width); ret = IEEE80211_STA_DISABLE_VHT; goto out; } if (!cfg80211_chandef_valid(&vht_chandef)) { if (verbose) sdata_info(sdata, "AP VHT information is invalid, disable VHT\n"); ret = IEEE80211_STA_DISABLE_VHT; goto out; } if (cfg80211_chandef_identical(chandef, &vht_chandef)) { ret = 0; goto out; } if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) { if (verbose) sdata_info(sdata, "AP VHT information doesn't match HT, disable VHT\n"); ret = IEEE80211_STA_DISABLE_VHT; goto out; } *chandef = vht_chandef; ret = 0; out: /* don't print the message below for VHT mismatch if VHT is disabled */ if (ret & IEEE80211_STA_DISABLE_VHT) vht_chandef = *chandef; while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, IEEE80211_CHAN_DISABLED)) { if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) { ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT; goto out; } ret |= chandef_downgrade(chandef); } if (chandef->width != vht_chandef.width && verbose) sdata_info(sdata, "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n"); WARN_ON_ONCE(!cfg80211_chandef_valid(chandef)); return ret; } static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, const struct ieee80211_ht_operation *ht_oper, const struct ieee80211_vht_operation *vht_oper, const u8 *bssid, u32 *changed) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_supported_band *sband; struct ieee80211_channel *chan; struct cfg80211_chan_def chandef; u16 ht_opmode; u32 flags; enum ieee80211_sta_rx_bandwidth new_sta_bw; int ret; /* if HT was/is disabled, don't track any bandwidth changes */ if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper) return 0; /* don't check VHT if we associated as non-VHT station */ if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) vht_oper = NULL; if (WARN_ON_ONCE(!sta)) return -EINVAL; chan = sdata->vif.bss_conf.chandef.chan; sband = local->hw.wiphy->bands[chan->band]; /* calculate new channel (type) based on HT/VHT operation IEs */ flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper, vht_oper, &chandef, false); /* * Downgrade the new channel if we associated with restricted * capabilities. For example, if we associated as a 20 MHz STA * to a 40 MHz AP (due to regulatory, capabilities or config * reasons) then switching to a 40 MHz channel now won't do us * any good -- we couldn't use it with the AP. */ if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && chandef.width == NL80211_CHAN_WIDTH_80P80) flags |= chandef_downgrade(&chandef); if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && chandef.width == NL80211_CHAN_WIDTH_160) flags |= chandef_downgrade(&chandef); if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && chandef.width > NL80211_CHAN_WIDTH_20) flags |= chandef_downgrade(&chandef); if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef)) return 0; sdata_info(sdata, "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n", ifmgd->bssid, chandef.chan->center_freq, chandef.width, chandef.center_freq1, chandef.center_freq2); if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT | IEEE80211_STA_DISABLE_40MHZ | IEEE80211_STA_DISABLE_80P80MHZ | IEEE80211_STA_DISABLE_160MHZ)) || !cfg80211_chandef_valid(&chandef)) { sdata_info(sdata, "AP %pM changed bandwidth in a way we can't support - disconnect\n", ifmgd->bssid); return -EINVAL; } switch (chandef.width) { case NL80211_CHAN_WIDTH_20_NOHT: case NL80211_CHAN_WIDTH_20: new_sta_bw = IEEE80211_STA_RX_BW_20; break; case NL80211_CHAN_WIDTH_40: new_sta_bw = IEEE80211_STA_RX_BW_40; break; case NL80211_CHAN_WIDTH_80: new_sta_bw = IEEE80211_STA_RX_BW_80; break; case NL80211_CHAN_WIDTH_80P80: case NL80211_CHAN_WIDTH_160: new_sta_bw = IEEE80211_STA_RX_BW_160; break; default: return -EINVAL; } if (new_sta_bw > sta->cur_max_bandwidth) new_sta_bw = sta->cur_max_bandwidth; if (new_sta_bw < sta->sta.bandwidth) { sta->sta.bandwidth = new_sta_bw; rate_control_rate_update(local, sband, sta, IEEE80211_RC_BW_CHANGED); } ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed); if (ret) { sdata_info(sdata, "AP %pM changed bandwidth to incompatible one - disconnect\n", ifmgd->bssid); return ret; } if (new_sta_bw > sta->sta.bandwidth) { sta->sta.bandwidth = new_sta_bw; rate_control_rate_update(local, sband, sta, IEEE80211_RC_BW_CHANGED); } ht_opmode = le16_to_cpu(ht_oper->operation_mode); /* if bss configuration changed store the new one */ if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { *changed |= BSS_CHANGED_HT; sdata->vif.bss_conf.ht_operation_mode = ht_opmode; } return 0; } /* 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, struct ieee80211_vht_cap *ap_vht_cap) { 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)); ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); /* determine capability flags */ cap = vht_cap.cap; if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) { cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ; cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; } if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) { cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160; cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; } /* * Some APs apparently get confused if our capabilities are better * than theirs, so restrict what we advertise in the assoc request. */ if (!(ap_vht_cap->vht_cap_info & cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE))) cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE; /* reserve and fill IE */ pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 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; struct ieee80211_chanctx_conf *chanctx_conf; struct ieee80211_channel *chan; u32 rates = 0; lockdep_assert_held(&ifmgd->mtx); rcu_read_lock(); chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (WARN_ON(!chanctx_conf)) { rcu_read_unlock(); return; } chan = chanctx_conf->def.chan; rcu_read_unlock(); sband = local->hw.wiphy->bands[chan->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_cap) + /* 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++ = chan->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 (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))) ifmgd->flags |= IEEE80211_STA_DISABLE_VHT; if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param, sband, chan, sdata->smps_mode); if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) ieee80211_add_vht_ie(sdata, skb, sband, &assoc_data->ap_vht_cap); /* 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; if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | IEEE80211_TX_INTFL_MLME_CONN_TX; 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 | IEEE80211_TX_INTFL_OFFCHAN_TX_OK; 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_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (!ieee80211_sdata_running(sdata)) return; mutex_lock(&ifmgd->mtx); if (!ifmgd->associated) goto out; local->_oper_chandef = local->csa_chandef; if (!local->ops->channel_switch) { /* call "hw_config" only if doing sw channel switch */ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); } else { /* update the device channel directly */ local->hw.conf.chandef = local->_oper_chandef; } /* XXX: shouldn't really modify cfg80211-owned data! */ ifmgd->associated->channel = local->_oper_chandef.chan; /* XXX: wait for a beacon first? */ ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, 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 = vif_to_sdata(vif); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; trace_api_chswitch_done(sdata, success); if (!success) { sdata_info(sdata, "driver channel switch failed, disconnecting\n"); ieee80211_queue_work(&sdata->local->hw, &ifmgd->csa_connection_drop_work); } else { 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; ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work); } static void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, u64 timestamp, struct ieee802_11_elems *elems) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct cfg80211_bss *cbss = ifmgd->associated; struct ieee80211_bss *bss; struct ieee80211_chanctx *chanctx; enum ieee80211_band new_band; int new_freq; u8 new_chan_no; u8 count; u8 mode; struct ieee80211_channel *new_chan; struct cfg80211_chan_def new_chandef = {}; struct cfg80211_chan_def new_vht_chandef = {}; const struct ieee80211_sec_chan_offs_ie *sec_chan_offs; const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie; int secondary_channel_offset = -1; ASSERT_MGD_MTX(ifmgd); if (!cbss) return; if (local->scanning) return; /* disregard subsequent announcements if we are already processing */ if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED) return; sec_chan_offs = elems->sec_chan_offs; wide_bw_chansw_ie = elems->wide_bw_chansw_ie; if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_40MHZ)) { sec_chan_offs = NULL; wide_bw_chansw_ie = NULL; } if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT) wide_bw_chansw_ie = NULL; if (elems->ext_chansw_ie) { if (!ieee80211_operating_class_to_band( elems->ext_chansw_ie->new_operating_class, &new_band)) { sdata_info(sdata, "cannot understand ECSA IE operating class %d, disconnecting\n", elems->ext_chansw_ie->new_operating_class); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); } new_chan_no = elems->ext_chansw_ie->new_ch_num; count = elems->ext_chansw_ie->count; mode = elems->ext_chansw_ie->mode; } else if (elems->ch_switch_ie) { new_band = cbss->channel->band; new_chan_no = elems->ch_switch_ie->new_ch_num; count = elems->ch_switch_ie->count; mode = elems->ch_switch_ie->mode; } else { /* nothing here we understand */ return; } bss = (void *)cbss->priv; new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band); new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq); if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) { sdata_info(sdata, "AP %pM switches to unsupported channel (%d MHz), disconnecting\n", ifmgd->associated->bssid, new_freq); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); return; } if (sec_chan_offs) { secondary_channel_offset = sec_chan_offs->sec_chan_offs; } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) { /* if HT is enabled and the IE not present, it's still HT */ secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE; } switch (secondary_channel_offset) { default: /* secondary_channel_offset was present but is invalid */ case IEEE80211_HT_PARAM_CHA_SEC_NONE: cfg80211_chandef_create(&new_chandef, new_chan, NL80211_CHAN_HT20); break; case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: cfg80211_chandef_create(&new_chandef, new_chan, NL80211_CHAN_HT40PLUS); break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: cfg80211_chandef_create(&new_chandef, new_chan, NL80211_CHAN_HT40MINUS); break; case -1: cfg80211_chandef_create(&new_chandef, new_chan, NL80211_CHAN_NO_HT); break; } if (wide_bw_chansw_ie) { new_vht_chandef.chan = new_chan; new_vht_chandef.center_freq1 = ieee80211_channel_to_frequency( wide_bw_chansw_ie->new_center_freq_seg0, new_band); switch (wide_bw_chansw_ie->new_channel_width) { default: /* hmmm, ignore VHT and use HT if present */ case IEEE80211_VHT_CHANWIDTH_USE_HT: new_vht_chandef.chan = NULL; break; case IEEE80211_VHT_CHANWIDTH_80MHZ: new_vht_chandef.width = NL80211_CHAN_WIDTH_80; break; case IEEE80211_VHT_CHANWIDTH_160MHZ: new_vht_chandef.width = NL80211_CHAN_WIDTH_160; break; case IEEE80211_VHT_CHANWIDTH_80P80MHZ: /* field is otherwise reserved */ new_vht_chandef.center_freq2 = ieee80211_channel_to_frequency( wide_bw_chansw_ie->new_center_freq_seg1, new_band); new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80; break; } if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ && new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80) chandef_downgrade(&new_vht_chandef); if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ && new_vht_chandef.width == NL80211_CHAN_WIDTH_160) chandef_downgrade(&new_vht_chandef); if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ && new_vht_chandef.width > NL80211_CHAN_WIDTH_20) chandef_downgrade(&new_vht_chandef); } /* if VHT data is there validate & use it */ if (new_vht_chandef.chan) { if (!cfg80211_chandef_compatible(&new_vht_chandef, &new_chandef)) { sdata_info(sdata, "AP %pM CSA has inconsistent channel data, disconnecting\n", ifmgd->associated->bssid); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); return; } new_chandef = new_vht_chandef; } if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef, IEEE80211_CHAN_DISABLED)) { sdata_info(sdata, "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", ifmgd->associated->bssid, new_freq, new_chandef.width, new_chandef.center_freq1, new_chandef.center_freq2); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); return; } ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED; if (local->use_chanctx) { sdata_info(sdata, "not handling channel switch with channel contexts\n"); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); return; } mutex_lock(&local->chanctx_mtx); if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) { mutex_unlock(&local->chanctx_mtx); return; } chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf), struct ieee80211_chanctx, conf); if (chanctx->refcount > 1) { sdata_info(sdata, "channel switch with multiple interfaces on the same channel, disconnecting\n"); ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work); mutex_unlock(&local->chanctx_mtx); return; } mutex_unlock(&local->chanctx_mtx); local->csa_chandef = new_chandef; if (mode) ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_CSA); if (local->ops->channel_switch) { /* use driver's channel switch callback */ struct ieee80211_channel_switch ch_switch = { .timestamp = timestamp, .block_tx = mode, .chandef = new_chandef, .count = count, }; drv_channel_switch(local, &ch_switch); return; } /* channel switch handled in software */ if (count <= 1) ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work); else mod_timer(&ifmgd->chswitch_timer, TU_TO_EXP_TIME(count * cbss->beacon_interval)); } static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata, struct ieee80211_channel *channel, const u8 *country_ie, u8 country_ie_len, const u8 *pwr_constr_elem) { struct ieee80211_country_ie_triplet *triplet; int chan = ieee80211_frequency_to_channel(channel->center_freq); int i, chan_pwr, chan_increment, new_ap_level; bool have_chan_pwr = false; /* Invalid IE */ if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) return 0; triplet = (void *)(country_ie + 3); country_ie_len -= 3; switch (channel->band) { default: WARN_ON_ONCE(1); /* fall through */ case IEEE80211_BAND_2GHZ: case IEEE80211_BAND_60GHZ: chan_increment = 1; break; case IEEE80211_BAND_5GHZ: chan_increment = 4; break; } /* find channel */ while (country_ie_len >= 3) { u8 first_channel = triplet->chans.first_channel; if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID) goto next; for (i = 0; i < triplet->chans.num_channels; i++) { if (first_channel + i * chan_increment == chan) { have_chan_pwr = true; chan_pwr = triplet->chans.max_power; break; } } if (have_chan_pwr) break; next: triplet++; country_ie_len -= 3; } if (!have_chan_pwr) return 0; new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem); if (sdata->ap_power_level == new_ap_level) return 0; sdata_info(sdata, "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n", new_ap_level, chan_pwr, *pwr_constr_elem, sdata->u.mgd.bssid); sdata->ap_power_level = new_ap_level; if (__ieee80211_recalc_txpower(sdata)) return BSS_CHANGED_TXPOWER; return 0; } /* 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)) { 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->hw.conf.dynamic_ps_timeout = timeout; if (beaconint_us > latency) { local->ps_sdata = NULL; } else { int maxslp = 1; u8 dtimper = found->u.mgd.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_MAX_QUEUE_MAP, 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->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)) { 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 */ ieee80211_flush_queues(local, sdata); } } 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); } } 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); } void ieee80211_dfs_cac_timer_work(struct work_struct *work) { struct delayed_work *delayed_work = container_of(work, struct delayed_work, work); struct ieee80211_sub_if_data *sdata = container_of(delayed_work, struct ieee80211_sub_if_data, dfs_cac_timer_work); ieee80211_vif_release_channel(sdata); cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL); } /* MLME */ static bool ieee80211_sta_wmm_params(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, const 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; const u8 *pos; u8 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.acm = acm; 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 (ieee80211_get_sdata_band(sdata) == 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( 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; if (sdata->vif.p2p) { const struct cfg80211_bss_ies *ies; rcu_read_lock(); ies = rcu_dereference(cbss->ies); if (ies) { int ret; ret = cfg80211_get_p2p_attr( ies->data, ies->len, IEEE80211_P2P_ATTR_ABSENCE_NOTICE, (u8 *) &bss_conf->p2p_noa_attr, sizeof(bss_conf->p2p_noa_attr)); if (ret >= 2) { sdata->u.mgd.p2p_noa_index = bss_conf->p2p_noa_attr.index; bss_info_changed |= BSS_CHANGED_P2P_PS; } } rcu_read_unlock(); } /* just to be sure */ ieee80211_stop_poll(sdata); ieee80211_led_assoc(local, 1); if (sdata->u.mgd.assoc_data->have_beacon) { /* * If the AP is buggy we may get here with no DTIM period * known, so assume it's 1 which is the only safe assumption * in that case, although if the TIM IE is broken powersave * probably just won't work at all. */ bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1; bss_info_changed |= BSS_CHANGED_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_addr_cnt) 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); mutex_unlock(&local->iflist_mtx); ieee80211_recalc_smps(sdata); ieee80211_recalc_ps_vif(sdata); 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; 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; netif_carrier_off(sdata->dev); /* * 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) ieee80211_flush_queues(local, sdata); /* deauthenticate/disassociate now */ if (tx || frame_buf) ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype, reason, tx, frame_buf); /* flush out frame */ if (tx) ieee80211_flush_queues(local, sdata); /* clear bssid only after building the needed mgmt frames */ memset(ifmgd->bssid, 0, ETH_ALEN); /* remove AP and TDLS peers */ sta_info_flush_defer(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; ifmgd->p2p_noa_index = -1; memset(&sdata->vif.bss_conf.p2p_noa_attr, 0, sizeof(sdata->vif.bss_conf.p2p_noa_attr)); /* on the next assoc, re-program HT/VHT parameters */ memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa)); memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask)); memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa)); memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask)); sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL; del_timer_sync(&local->dynamic_ps_timer); cancel_work_sync(&local->dynamic_ps_enable_work); /* Disable ARP filtering */ if (sdata->vif.bss_conf.arp_addr_cnt) 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); /* 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); sdata->vif.bss_conf.dtim_period = 0; ifmgd->flags = 0; ieee80211_vif_release_channel(sdata); } 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 (ieee80211_is_nullfunc(hdr->frame_control) && sdata->u.mgd.probe_send_count > 0) { if (ack) ieee80211_sta_reset_conn_monitor(sdata); else sdata->u.mgd.nullfunc_failed = true; ieee80211_queue_work(&sdata->local->hw, &sdata->work); return; } if (ack) ieee80211_sta_reset_conn_monitor(sdata); } 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; rcu_read_lock(); 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, 0, ifmgd->associated->channel, false); rcu_read_unlock(); } 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) ieee80211_flush_queues(sdata->local, sdata); } 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 (missed %d beacons) - probing\n", beacon_loss_count); 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; rcu_read_lock(); 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, cbss->channel, ssid + 2, ssid_len, NULL, 0, true); rcu_read_unlock(); return skb; } EXPORT_SYMBOL(ieee80211_ap_probereq_get); static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; mutex_lock(&ifmgd->mtx); if (!ifmgd->associated) { mutex_unlock(&ifmgd->mtx); return; } ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, true, frame_buf); ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; ieee80211_wake_queues_by_reason(&sdata->local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_CSA); mutex_unlock(&ifmgd->mtx); /* * must be outside lock due to cfg80211, * but that's not a problem. */ cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN); } static 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 (ifmgd->connection_loss) { sdata_info(sdata, "Connection to AP %pM lost\n", ifmgd->bssid); __ieee80211_disconnect(sdata); } else { ieee80211_mgd_probe_ap(sdata, true); } } static void ieee80211_csa_connection_drop_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.csa_connection_drop_work); __ieee80211_disconnect(sdata); } 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); sdata->u.mgd.connection_loss = false; 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); sdata->u.mgd.connection_loss = true; 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); sdata->u.mgd.flags = 0; ieee80211_vif_release_channel(sdata); } cfg80211_put_bss(sdata->local->hw.wiphy, 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_local *local = sdata->local; struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data; u8 *pos; struct ieee802_11_elems elems; u32 tx_flags = 0; pos = mgmt->u.auth.variable; ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems); if (!elems.challenge) return; auth_data->expected_transaction = 4; drv_mgd_prepare_tx(sdata->local, sdata); if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS | IEEE80211_TX_INTFL_MLME_CONN_TX; ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0, 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, tx_flags); } 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_a