/* * 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 "ieee80211_i.h" #include "driver-ops.h" #include "rate.h" #include "led.h" #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) #define IEEE80211_AUTH_MAX_TRIES 3 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) #define IEEE80211_ASSOC_MAX_TRIES 3 #define IEEE80211_MONITORING_INTERVAL (2 * HZ) #define IEEE80211_PROBE_WAIT (HZ / 5) #define IEEE80211_PROBE_IDLE_TIME (60 * HZ) #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ) #define TMR_RUNNING_TIMER 0 #define TMR_RUNNING_CHANSW 1 /* utils */ static int ecw2cw(int ecw) { return (1 << ecw) - 1; } static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie) { u8 *end, *pos; pos = bss->cbss.information_elements; if (pos == NULL) return NULL; end = pos + bss->cbss.len_information_elements; while (pos + 1 < end) { if (pos + 2 + pos[1] > end) break; if (pos[0] == ie) return pos; pos += 2 + pos[1]; } return NULL; } static int ieee80211_compatible_rates(struct ieee80211_bss *bss, struct ieee80211_supported_band *sband, u32 *rates) { int i, j, count; *rates = 0; count = 0; for (i = 0; i < bss->supp_rates_len; i++) { int rate = (bss->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; } /* * ieee80211_enable_ht should be called only after the operating band * has been determined as ht configuration depends on the hw's * HT abilities for a specific band. */ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, struct ieee80211_ht_info *hti, u16 ap_ht_cap_flags) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct sta_info *sta; u32 changed = 0; u16 ht_opmode; bool enable_ht = true, ht_changed; enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; /* HT is not supported */ if (!sband->ht_cap.ht_supported) enable_ht = false; /* check that channel matches the right operating channel */ if (local->hw.conf.channel->center_freq != ieee80211_channel_to_frequency(hti->control_chan)) enable_ht = false; if (enable_ht) { channel_type = NL80211_CHAN_HT20; if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: if (!(local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)) channel_type = NL80211_CHAN_HT40PLUS; break; case IEEE80211_HT_PARAM_CHA_SEC_BELOW: if (!(local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)) channel_type = NL80211_CHAN_HT40MINUS; break; } } } ht_changed = conf_is_ht(&local->hw.conf) != enable_ht || channel_type != local->hw.conf.channel_type; local->oper_channel_type = channel_type; if (ht_changed) { /* channel_type change automatically detected */ ieee80211_hw_config(local, 0); rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (sta) rate_control_rate_update(local, sband, sta, IEEE80211_RC_HT_CHANGED); rcu_read_unlock(); } /* disable HT */ if (!enable_ht) return 0; ht_opmode = le16_to_cpu(hti->operation_mode); /* if bss configuration changed store the new one */ if (!sdata->ht_opmode_valid || sdata->vif.bss_conf.ht_operation_mode != ht_opmode) { changed |= BSS_CHANGED_HT; sdata->vif.bss_conf.ht_operation_mode = ht_opmode; sdata->ht_opmode_valid = true; } return changed; } /* frame sending functions */ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos, *ies, *ht_ie; int i, len, count, rates_len, supp_rates_len; u16 capab; struct ieee80211_bss *bss; int wmm = 0; struct ieee80211_supported_band *sband; u32 rates = 0; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 + ifmgd->extra_ie_len + ifmgd->ssid_len); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for assoc " "frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; capab = ifmgd->capab; if (local->hw.conf.channel->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; } bss = ieee80211_rx_bss_get(local, ifmgd->bssid, local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); if (bss) { if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY) capab |= WLAN_CAPABILITY_PRIVACY; if (bss->wmm_used) wmm = 1; /* 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(bss, sband, &rates); if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; ieee80211_rx_bss_put(local, bss); } else { rates = ~0; rates_len = sband->n_bitrates; } mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN); if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) { 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, ifmgd->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 */ ies = pos = skb_put(skb, 2 + ifmgd->ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ifmgd->ssid_len; memcpy(pos, ifmgd->ssid, ifmgd->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; len = sband->n_bitrates; 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->hw.conf.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 (ifmgd->extra_ie) { pos = skb_put(skb, ifmgd->extra_ie_len); memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len); } if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) { 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++ = 0; } /* wmm support is a must to HT */ /* * 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. */ if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) && sband->ht_cap.ht_supported && (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) && ht_ie[1] >= sizeof(struct ieee80211_ht_info) && (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) { struct ieee80211_ht_info *ht_info = (struct ieee80211_ht_info *)(ht_ie + 2); u16 cap = sband->ht_cap.cap; __le16 tmp; u32 flags = local->hw.conf.channel->flags; switch (ht_info->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; } tmp = cpu_to_le16(cap); pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2); *pos++ = WLAN_EID_HT_CAPABILITY; *pos++ = sizeof(struct ieee80211_ht_cap); memset(pos, 0, sizeof(struct ieee80211_ht_cap)); memcpy(pos, &tmp, sizeof(u16)); pos += sizeof(u16); /* TODO: needs a define here for << 2 */ *pos++ = sband->ht_cap.ampdu_factor | (sband->ht_cap.ampdu_density << 2); memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); } kfree(ifmgd->assocreq_ies); ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies; ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL); if (ifmgd->assocreq_ies) memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len); ieee80211_tx_skb(sdata, skb, 0); } static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, u16 stype, u16 reason) { struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for " "deauth/disassoc frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); skb_put(skb, 2); /* u.deauth.reason_code == u.disassoc.reason_code */ mgmt->u.deauth.reason_code = cpu_to_le16(reason); if (stype == IEEE80211_STYPE_DEAUTH) cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len); else cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len); ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED); } void ieee80211_send_pspoll(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_pspoll *pspoll; struct sk_buff *skb; u16 fc; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for " "pspoll frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); memset(pspoll, 0, sizeof(*pspoll)); fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM; pspoll->frame_control = cpu_to_le16(fc); pspoll->aid = cpu_to_le16(ifmgd->aid); /* aid in PS-Poll has its two MSBs each set to 1 */ pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN); ieee80211_tx_skb(sdata, skb, 0); } void ieee80211_send_nullfunc(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, int powersave) { 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 + 24); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc " "frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24); memset(nullfunc, 0, 24); fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | IEEE80211_FCTL_TODS); if (powersave) fc |= cpu_to_le16(IEEE80211_FCTL_PM); nullfunc->frame_control = fc; memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN); memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); ieee80211_tx_skb(sdata, skb, 0); } /* 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_bss *bss; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (!netif_running(sdata->dev)) return; bss = ieee80211_rx_bss_get(sdata->local, ifmgd->bssid, sdata->local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); if (!bss) goto exit; sdata->local->oper_channel = sdata->local->csa_channel; /* XXX: shouldn't really modify cfg80211-owned data! */ if (!ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL)) bss->cbss.channel = sdata->local->oper_channel; ieee80211_rx_bss_put(sdata->local, bss); exit: ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; ieee80211_wake_queues_by_reason(&sdata->local->hw, IEEE80211_QUEUE_STOP_REASON_CSA); } 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; } queue_work(sdata->local->hw.workqueue, &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) { 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); if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATED) return; if (sdata->local->sw_scanning || sdata->local->hw_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 (sw_elem->count <= 1) { queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work); } else { 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 * bss->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_power) && (*pwr_constr_elem != sdata->local->power_constr_level)) { sdata->local->power_constr_level = *pwr_constr_elem; ieee80211_hw_config(sdata->local, 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->hw_scanning || local->sw_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); 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); } } /* 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; if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) { local->ps_sdata = NULL; return; } list_for_each_entry(sdata, &local->interfaces, list) { if (!netif_running(sdata->dev)) continue; if (sdata->vif.type != NL80211_IFTYPE_STATION) continue; found = sdata; count++; } if (count == 1 && found->u.mgd.powersave && (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED) && !(found->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL)) { s32 beaconint_us; if (latency < 0) latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY); beaconint_us = ieee80211_tu_to_usec( found->vif.bss_conf.beacon_int); if (beaconint_us > latency) { local->ps_sdata = NULL; } else { u8 dtimper = found->vif.bss_conf.dtim_period; int maxslp = 1; if (dtimper > 1) maxslp = min_t(int, dtimper, latency / beaconint_us); local->hw.conf.max_sleep_period = maxslp; local->ps_sdata = found; } } else { local->ps_sdata = NULL; } ieee80211_change_ps(local); } 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; /* can only happen when PS was just disabled anyway */ if (!sdata) return; if (local->hw.conf.flags & IEEE80211_CONF_PS) return; if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) ieee80211_send_nullfunc(local, sdata, 1); 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; queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work); } /* MLME */ static void ieee80211_sta_wmm_params(struct ieee80211_local *local, struct ieee80211_if_managed *ifmgd, u8 *wmm_param, size_t wmm_param_len) { struct ieee80211_tx_queue_params params; size_t left; int count; u8 *pos; if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) return; if (!wmm_param) return; if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) return; count = wmm_param[6] & 0x0f; if (count == ifmgd->wmm_last_param_set) return; ifmgd->wmm_last_param_set = count; pos = wmm_param + 8; left = wmm_param_len - 8; memset(¶ms, 0, sizeof(params)); local->wmm_acm = 0; for (; left >= 4; left -= 4, pos += 4) { int aci = (pos[0] >> 5) & 0x03; int acm = (pos[0] >> 4) & 0x01; int queue; switch (aci) { case 1: /* AC_BK */ queue = 3; if (acm) local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */ break; case 2: /* AC_VI */ queue = 1; if (acm) local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */ break; case 3: /* AC_VO */ queue = 0; if (acm) local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */ break; case 0: /* AC_BE */ default: queue = 2; if (acm) local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */ 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); #ifdef CONFIG_MAC80211_VERBOSE_DEBUG printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d " "cWmin=%d cWmax=%d txop=%d\n", wiphy_name(local->hw.wiphy), queue, aci, acm, params.aifs, params.cw_min, params.cw_max, params.txop); #endif if (drv_conf_tx(local, queue, ¶ms) && local->ops->conf_tx) printk(KERN_DEBUG "%s: failed to set TX queue " "parameters for queue %d\n", wiphy_name(local->hw.wiphy), queue); } } 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; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; #endif 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 (use_protection != bss_conf->use_cts_prot) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n", sdata->dev->name, use_protection ? "enabled" : "disabled", ifmgd->bssid); } #endif bss_conf->use_cts_prot = use_protection; changed |= BSS_CHANGED_ERP_CTS_PROT; } if (use_short_preamble != bss_conf->use_short_preamble) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: switched to %s barker preamble" " (BSSID=%pM)\n", sdata->dev->name, use_short_preamble ? "short" : "long", ifmgd->bssid); } #endif bss_conf->use_short_preamble = use_short_preamble; changed |= BSS_CHANGED_ERP_PREAMBLE; } if (use_short_slot != bss_conf->use_short_slot) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: switched to %s slot time" " (BSSID=%pM)\n", sdata->dev->name, use_short_slot ? "short" : "long", ifmgd->bssid); } #endif bss_conf->use_short_slot = use_short_slot; changed |= BSS_CHANGED_ERP_SLOT; } return changed; } static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata) { union iwreq_data wrqu; memset(&wrqu, 0, sizeof(wrqu)); if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN); wrqu.ap_addr.sa_family = ARPHRD_ETHER; wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); } static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; char *buf; size_t len; int i; union iwreq_data wrqu; if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies) return; buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len + ifmgd->assocresp_ies_len), GFP_KERNEL); if (!buf) return; len = sprintf(buf, "ASSOCINFO("); if (ifmgd->assocreq_ies) { len += sprintf(buf + len, "ReqIEs="); for (i = 0; i < ifmgd->assocreq_ies_len; i++) { len += sprintf(buf + len, "%02x", ifmgd->assocreq_ies[i]); } } if (ifmgd->assocresp_ies) { if (ifmgd->assocreq_ies) len += sprintf(buf + len, " "); len += sprintf(buf + len, "RespIEs="); for (i = 0; i < ifmgd->assocresp_ies_len; i++) { len += sprintf(buf + len, "%02x", ifmgd->assocresp_ies[i]); } } len += sprintf(buf + len, ")"); if (len > IW_CUSTOM_MAX) { len = sprintf(buf, "ASSOCRESPIE="); for (i = 0; i < ifmgd->assocresp_ies_len; i++) { len += sprintf(buf + len, "%02x", ifmgd->assocresp_ies[i]); } } if (len <= IW_CUSTOM_MAX) { memset(&wrqu, 0, sizeof(wrqu)); wrqu.data.length = len; wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf); } kfree(buf); } static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, u32 bss_info_changed) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_conf *conf = &local_to_hw(local)->conf; struct ieee80211_bss *bss; bss_info_changed |= BSS_CHANGED_ASSOC; ifmgd->flags |= IEEE80211_STA_ASSOCIATED; bss = ieee80211_rx_bss_get(local, ifmgd->bssid, conf->channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); if (bss) { /* set timing information */ sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval; sdata->vif.bss_conf.timestamp = bss->cbss.tsf; sdata->vif.bss_conf.dtim_period = bss->dtim_period; bss_info_changed |= BSS_CHANGED_BEACON_INT; bss_info_changed |= ieee80211_handle_bss_capability(sdata, bss->cbss.capability, bss->has_erp_value, bss->erp_value); cfg80211_hold_bss(&bss->cbss); ieee80211_rx_bss_put(local, bss); } ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET; memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN); ieee80211_sta_send_associnfo(sdata); ifmgd->last_probe = jiffies; ieee80211_led_assoc(local, 1); sdata->vif.bss_conf.assoc = 1; /* * For now just always ask the driver to update the basic rateset * when we have associated, we aren't checking whether it actually * changed or not. */ bss_info_changed |= BSS_CHANGED_BASIC_RATES; /* And the BSSID changed - we're associated now */ bss_info_changed |= BSS_CHANGED_BSSID; ieee80211_bss_info_change_notify(sdata, bss_info_changed); /* will be same as sdata */ if (local->ps_sdata) { mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); } netif_tx_start_all_queues(sdata->dev); netif_carrier_on(sdata->dev); ieee80211_sta_send_apinfo(sdata); } static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; ifmgd->direct_probe_tries++; if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) { printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n", sdata->dev->name, ifmgd->bssid); ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid); /* * Most likely AP is not in the range so remove the * bss information associated to the AP */ ieee80211_rx_bss_remove(sdata, ifmgd->bssid, sdata->local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); /* * We might have a pending scan which had no chance to run yet * due to state == IEEE80211_STA_MLME_DIRECT_PROBE. * Hence, queue the STAs work again */ queue_work(local->hw.workqueue, &ifmgd->work); return; } printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n", sdata->dev->name, ifmgd->bssid, ifmgd->direct_probe_tries); ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE; /* 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, ifmgd->ssid, ifmgd->ssid_len, NULL, 0); mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT); } static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; u8 *ies; size_t ies_len; ifmgd->auth_tries++; if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) { printk(KERN_DEBUG "%s: authentication with AP %pM" " timed out\n", sdata->dev->name, ifmgd->bssid); ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid); ieee80211_rx_bss_remove(sdata, ifmgd->bssid, sdata->local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); /* * We might have a pending scan which had no chance to run yet * due to state == IEEE80211_STA_MLME_AUTHENTICATE. * Hence, queue the STAs work again */ queue_work(local->hw.workqueue, &ifmgd->work); return; } ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE; printk(KERN_DEBUG "%s: authenticate with AP %pM\n", sdata->dev->name, ifmgd->bssid); if (ifmgd->flags & IEEE80211_STA_EXT_SME) { ies = ifmgd->sme_auth_ie; ies_len = ifmgd->sme_auth_ie_len; } else { ies = NULL; ies_len = 0; } ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len, ifmgd->bssid, 0); ifmgd->auth_transaction = 2; mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT); } /* * The disassoc 'reason' argument can be either our own reason * if self disconnected or a reason code from the AP. */ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, bool deauth, bool self_disconnected, u16 reason) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_conf *conf = &local_to_hw(local)->conf; struct ieee80211_bss *bss; struct sta_info *sta; u32 changed = 0, config_changed = 0; if (deauth) { ifmgd->direct_probe_tries = 0; ifmgd->auth_tries = 0; } ifmgd->assoc_scan_tries = 0; ifmgd->assoc_tries = 0; netif_tx_stop_all_queues(sdata->dev); netif_carrier_off(sdata->dev); rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (sta) ieee80211_sta_tear_down_BA_sessions(sta); rcu_read_unlock(); bss = ieee80211_rx_bss_get(local, ifmgd->bssid, conf->channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); if (bss) { cfg80211_unhold_bss(&bss->cbss); ieee80211_rx_bss_put(local, bss); } if (self_disconnected) { if (deauth) ieee80211_send_deauth_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason); else ieee80211_send_deauth_disassoc(sdata, IEEE80211_STYPE_DISASSOC, reason); } ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED; changed |= ieee80211_reset_erp_info(sdata); ieee80211_led_assoc(local, 0); changed |= BSS_CHANGED_ASSOC; sdata->vif.bss_conf.assoc = false; ieee80211_sta_send_apinfo(sdata); if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) { ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_rx_bss_remove(sdata, ifmgd->bssid, sdata->local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); } ieee80211_set_wmm_default(sdata); ieee80211_recalc_idle(local); /* channel(_type) changes are handled by ieee80211_hw_config */ local->oper_channel_type = NL80211_CHAN_NO_HT; /* on the next assoc, re-program HT parameters */ sdata->ht_opmode_valid = false; local->power_constr_level = 0; del_timer_sync(&local->dynamic_ps_timer); cancel_work_sync(&local->dynamic_ps_enable_work); if (local->hw.conf.flags & IEEE80211_CONF_PS) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; config_changed |= IEEE80211_CONF_CHANGE_PS; } ieee80211_hw_config(local, config_changed); /* And the BSSID changed -- not very interesting here */ changed |= BSS_CHANGED_BSSID; ieee80211_bss_info_change_notify(sdata, changed); rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (!sta) { rcu_read_unlock(); return; } sta_info_unlink(&sta); rcu_read_unlock(); sta_info_destroy(sta); } static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata) { if (!sdata || !sdata->default_key || sdata->default_key->conf.alg != ALG_WEP) return 0; return 1; } static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss; int bss_privacy; int wep_privacy; int privacy_invoked; if (!ifmgd || (ifmgd->flags & IEEE80211_STA_EXT_SME)) return 0; bss = ieee80211_rx_bss_get(local, ifmgd->bssid, local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); if (!bss) return 0; bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY); wep_privacy = !!ieee80211_sta_wep_configured(sdata); privacy_invoked = !!(ifmgd->flags & IEEE80211_STA_PRIVACY_INVOKED); ieee80211_rx_bss_put(local, bss); if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked)) return 0; return 1; } static void ieee80211_associate(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; ifmgd->assoc_tries++; if (ifmgd->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) { printk(KERN_DEBUG "%s: association with AP %pM" " timed out\n", sdata->dev->name, ifmgd->bssid); ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid); ieee80211_rx_bss_remove(sdata, ifmgd->bssid, sdata->local->hw.conf.channel->center_freq, ifmgd->ssid, ifmgd->ssid_len); /* * We might have a pending scan which had no chance to run yet * due to state == IEEE80211_STA_MLME_ASSOCIATE. * Hence, queue the STAs work again */ queue_work(local->hw.workqueue, &ifmgd->work); return; } ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE; printk(KERN_DEBUG "%s: associate with AP %pM\n", sdata->dev->name, ifmgd->bssid); if (ieee80211_privacy_mismatch(sdata)) { printk(KERN_DEBUG "%s: mismatch in privacy configuration and " "mixed-cell disabled - abort association\n", sdata->dev->name); ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); return; } ieee80211_send_assoc(sdata); mod_timer(&ifmgd->timer, jiffies + IEEE80211_ASSOC_TIMEOUT); } 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 periodical probe request to * the AP. */ if (!is_multicast_ether_addr(hdr->addr1)) mod_timer(&sdata->u.mgd.timer, jiffies + IEEE80211_MONITORING_INTERVAL); } void ieee80211_beacon_loss_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.beacon_loss_work); struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; /* * The driver has already reported this event and we have * already sent a probe request. Maybe the AP died and the * driver keeps reporting until we disassociate... We have * to ignore that because otherwise we would continually * reset the timer and never check whether we received a * probe response! */ if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) return; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: driver reports beacon loss from AP %pM " "- sending probe request\n", sdata->dev->name, sdata->u.mgd.bssid); } #endif ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL; mutex_lock(&sdata->local->iflist_mtx); ieee80211_recalc_ps(sdata->local, -1); mutex_unlock(&sdata->local->iflist_mtx); ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid, ifmgd->ssid_len, NULL, 0); mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT); } void ieee80211_beacon_loss(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.beacon_loss_work); } EXPORT_SYMBOL(ieee80211_beacon_loss); static void ieee80211_associated(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct sta_info *sta; unsigned long last_rx; bool disassoc = false; /* TODO: start monitoring current AP signal quality and number of * missed beacons. Scan other channels every now and then and search * for better APs. */ /* TODO: remove expired BSSes */ ifmgd->state = IEEE80211_STA_MLME_ASSOCIATED; rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (!sta) { printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n", sdata->dev->name, ifmgd->bssid); disassoc = true; rcu_read_unlock(); goto out; } last_rx = sta->last_rx; rcu_read_unlock(); if ((ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) && time_after(jiffies, last_rx + IEEE80211_PROBE_WAIT)) { printk(KERN_DEBUG "%s: no probe response from AP %pM " "- disassociating\n", sdata->dev->name, ifmgd->bssid); disassoc = true; ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL; goto out; } /* * Beacon filtering is only enabled with power save and then the * stack should not check for beacon loss. */ if (!((local->hw.flags & IEEE80211_HW_BEACON_FILTER) && (local->hw.conf.flags & IEEE80211_CONF_PS)) && time_after(jiffies, ifmgd->last_beacon + IEEE80211_MONITORING_INTERVAL)) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: beacon loss from AP %pM " "- sending probe request\n", sdata->dev->name, ifmgd->bssid); } #endif ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL; mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid, ifmgd->ssid_len, NULL, 0); mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT); goto out; } if (time_after(jiffies, last_rx + IEEE80211_PROBE_IDLE_TIME)) { ifmgd->flags |= IEEE80211_STA_PROBEREQ_POLL; mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); ieee80211_send_probe_req(sdata, ifmgd->bssid, ifmgd->ssid, ifmgd->ssid_len, NULL, 0); } out: if (!disassoc) mod_timer(&ifmgd->timer, jiffies + IEEE80211_MONITORING_INTERVAL); else ieee80211_set_disassoc(sdata, true, true, WLAN_REASON_PREV_AUTH_NOT_VALID); } static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name); ifmgd->flags |= IEEE80211_STA_AUTHENTICATED; if (ifmgd->flags & IEEE80211_STA_EXT_SME) { /* Wait for SME to request association */ ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(sdata->local); } else ieee80211_associate(sdata); } static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { 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; ieee80211_send_auth(sdata, 3, sdata->u.mgd.auth_alg, elems.challenge - 2, elems.challenge_len + 2, sdata->u.mgd.bssid, 1); sdata->u.mgd.auth_transaction = 4; } static void 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; u16 auth_alg, auth_transaction, status_code; if (ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE) return; if (len < 24 + 6) return; if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0) return; if (memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0) return; 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_alg || auth_transaction != ifmgd->auth_transaction) return; if (status_code != WLAN_STATUS_SUCCESS) { if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) { u8 algs[3]; const int num_algs = ARRAY_SIZE(algs); int i, pos; algs[0] = algs[1] = algs[2] = 0xff; if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN) algs[0] = WLAN_AUTH_OPEN; if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) algs[1] = WLAN_AUTH_SHARED_KEY; if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP) algs[2] = WLAN_AUTH_LEAP; if (ifmgd->auth_alg == WLAN_AUTH_OPEN) pos = 0; else if (ifmgd->auth_alg == WLAN_AUTH_SHARED_KEY) pos = 1; else pos = 2; for (i = 0; i < num_algs; i++) { pos++; if (pos >= num_algs) pos = 0; if (algs[pos] == ifmgd->auth_alg || algs[pos] == 0xff) continue; if (algs[pos] == WLAN_AUTH_SHARED_KEY && !ieee80211_sta_wep_configured(sdata)) continue; ifmgd->auth_alg = algs[pos]; break; } } return; } switch (ifmgd->auth_alg) { case WLAN_AUTH_OPEN: case WLAN_AUTH_LEAP: case WLAN_AUTH_FT: ieee80211_auth_completed(sdata); cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len); break; case WLAN_AUTH_SHARED_KEY: if (ifmgd->auth_transaction == 4) { ieee80211_auth_completed(sdata); cfg80211_send_rx_auth(sdata->dev, (u8 *) mgmt, len); } else ieee80211_auth_challenge(sdata, mgmt, len); break; } } static void 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; u16 reason_code; if (len < 24 + 2) return; if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN)) return; reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); if (ifmgd->flags & IEEE80211_STA_AUTHENTICATED) printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n", sdata->dev->name, reason_code); if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) && (ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE || ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE || ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED)) { ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE; mod_timer(&ifmgd->timer, jiffies + IEEE80211_RETRY_AUTH_INTERVAL); } ieee80211_set_disassoc(sdata, true, false, 0); ifmgd->flags &= ~IEEE80211_STA_AUTHENTICATED; cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, len); } static void 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; if (len < 24 + 2) return; if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN)) return; reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); if (ifmgd->flags & IEEE80211_STA_ASSOCIATED) printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n", sdata->dev->name, reason_code); if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) && ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) { ifmgd->state = IEEE80211_STA_MLME_ASSOCIATE; mod_timer(&ifmgd->timer, jiffies + IEEE80211_RETRY_AUTH_INTERVAL); } ieee80211_set_disassoc(sdata, false, false, reason_code); cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, len); } static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, int reassoc) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sta_info *sta; u32 rates, basic_rates; u16 capab_info, status_code, aid; struct ieee802_11_elems elems; struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; u8 *pos; u32 changed = 0; int i, j; bool have_higher_than_11mbit = false, newsta = false; u16 ap_ht_cap_flags; /* AssocResp and ReassocResp have identical structure, so process both * of them in this function. */ if (ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE) return; if (len < 24 + 6) return; if (memcmp(ifmgd->bssid, mgmt->sa, ETH_ALEN) != 0) return; 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); printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x " "status=%d aid=%d)\n", sdata->dev->name, 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; printk(KERN_DEBUG "%s: AP rejected association temporarily; " "comeback duration %u TU (%u ms)\n", sdata->dev->name, tu, ms); if (ms > IEEE80211_ASSOC_TIMEOUT) mod_timer(&ifmgd->timer, jiffies + msecs_to_jiffies(ms)); return; } if (status_code != WLAN_STATUS_SUCCESS) { printk(KERN_DEBUG "%s: AP denied association (code=%d)\n", sdata->dev->name, status_code); /* if this was a reassociation, ensure we try a "full" * association next time. This works around some broken APs * which do not correctly reject reassociation requests. */ ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET; cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len); if (ifmgd->flags & IEEE80211_STA_EXT_SME) { /* Wait for SME to decide what to do next */ ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); } return; } if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " "set\n", sdata->dev->name, aid); aid &= ~(BIT(15) | BIT(14)); if (!elems.supp_rates) { printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", sdata->dev->name); return; } printk(KERN_DEBUG "%s: associated\n", sdata->dev->name); ifmgd->aid = aid; ifmgd->ap_capab = capab_info; kfree(ifmgd->assocresp_ies); ifmgd->assocresp_ies_len = len - (pos - (u8 *) mgmt); ifmgd->assocresp_ies = kmalloc(ifmgd->assocresp_ies_len, GFP_KERNEL); if (ifmgd->assocresp_ies) memcpy(ifmgd->assocresp_ies, pos, ifmgd->assocresp_ies_len); rcu_read_lock(); /* Add STA entry for the AP */ sta = sta_info_get(local, ifmgd->bssid); if (!sta) { newsta = true; sta = sta_info_alloc(sdata, ifmgd->bssid, GFP_ATOMIC); if (!sta) { printk(KERN_DEBUG "%s: failed to alloc STA entry for" " the AP\n", sdata->dev->name); rcu_read_unlock(); return; } /* update new sta with its last rx activity */ sta->last_rx = jiffies; } /* * FIXME: Do we really need to update the sta_info's information here? * We already know about the AP (we found it in our list) so it * should already be filled with the right info, no? * As is stands, all this is racy because typically we assume * the information that is filled in here (except flags) doesn't * change while a STA structure is alive. As such, it should move * to between the sta_info_alloc() and sta_info_insert() above. */ set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP); if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT)) set_sta_flags(sta, WLAN_STA_AUTHORIZED); rates = 0; basic_rates = 0; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; for (i = 0; i < elems.supp_rates_len; i++) { int rate = (elems.supp_rates[i] & 0x7f) * 5; bool is_basic = !!(elems.supp_rates[i] & 0x80); if (rate > 110) have_higher_than_11mbit = true; for (j = 0; j < sband->n_bitrates; j++) { if (sband->bitrates[j].bitrate == rate) { rates |= BIT(j); if (is_basic) basic_rates |= BIT(j); break; } } } for (i = 0; i < elems.ext_supp_rates_len; i++) { int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; bool is_basic = !!(elems.ext_supp_rates[i] & 0x80); if (rate > 110) have_higher_than_11mbit = true; for (j = 0; j < sband->n_bitrates; j++) { if (sband->bitrates[j].bitrate == rate) { rates |= BIT(j); if (is_basic) basic_rates |= BIT(j); break; } } } sta->sta.supp_rates[local->hw.conf.channel->band] = rates; sdata->vif.bss_conf.basic_rates = basic_rates; /* cf. IEEE 802.11 9.2.12 */ if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; else sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; /* If TKIP/WEP is used, no need to parse AP's HT capabilities */ if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) ieee80211_ht_cap_ie_to_sta_ht_cap(sband, elems.ht_cap_elem, &sta->sta.ht_cap); ap_ht_cap_flags = sta->sta.ht_cap.cap; rate_control_rate_init(sta); if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) set_sta_flags(sta, WLAN_STA_MFP); if (elems.wmm_param) set_sta_flags(sta, WLAN_STA_WME); if (newsta) { int err = sta_info_insert(sta); if (err) { printk(KERN_DEBUG "%s: failed to insert STA entry for" " the AP (error %d)\n", sdata->dev->name, err); rcu_read_unlock(); return; } } rcu_read_unlock(); if (elems.wmm_param) ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param, elems.wmm_param_len); else ieee80211_set_wmm_default(sdata); if (elems.ht_info_elem && elems.wmm_param && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, ap_ht_cap_flags); /* 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, changed); /* * initialise the time of last beacon to be the association time, * otherwise beacon loss check will trigger immediately */ ifmgd->last_beacon = jiffies; ieee80211_associated(sdata); cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, len); } 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; if (elems->ds_params && elems->ds_params_len == 1) freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 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) return; if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) && (memcmp(mgmt->bssid, sdata->u.mgd.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); } ieee80211_rx_bss_put(local, bss); } static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status) { struct ieee80211_if_managed *ifmgd; size_t baselen; struct ieee802_11_elems elems; ifmgd = &sdata->u.mgd; if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) 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); /* direct probe may be part of the association flow */ if (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE) { printk(KERN_DEBUG "%s direct probe responded\n", sdata->dev->name); ieee80211_authenticate(sdata); } if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) { ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL; mutex_lock(&sdata->local->iflist_mtx); ieee80211_recalc_ps(sdata->local, -1); mutex_unlock(&sdata->local->iflist_mtx); } } /* * 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_INFORMATION); 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; 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; /* 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->flags & IEEE80211_STA_ASSOCIATED) || memcmp(ifmgd->bssid, mgmt->bssid, ETH_ALEN) != 0) return; if (ifmgd->flags & IEEE80211_STA_PROBEREQ_POLL) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (net_ratelimit()) { printk(KERN_DEBUG "%s: cancelling probereq poll due " "to a received beacon\n", sdata->dev->name); } #endif ifmgd->flags &= ~IEEE80211_STA_PROBEREQ_POLL; mutex_lock(&local->iflist_mtx); ieee80211_recalc_ps(local, -1); mutex_unlock(&local->iflist_mtx); } 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 (ncrc != ifmgd->beacon_crc) { ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param, elems.wmm_param_len); } if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) { if (directed_tim) { if (local->hw.conf.dynamic_ps_timeout > 0) { local->hw.conf.flags &= ~IEEE80211_CONF_PS; ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); ieee80211_send_nullfunc(local, sdata, 0); } else { 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) return; ifmgd->beacon_crc = ncrc; 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_info_elem && elems.wmm_param && !(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED)) { struct sta_info *sta; struct ieee80211_supported_band *sband; u16 ap_ht_cap_flags; rcu_read_lock(); sta = sta_info_get(local, ifmgd->bssid); if (!sta) { rcu_read_unlock(); return; } sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; ieee80211_ht_cap_ie_to_sta_ht_cap(sband, elems.ht_cap_elem, &sta->sta.ht_cap); ap_ht_cap_flags = sta->sta.ht_cap.cap; rcu_read_unlock(); changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, ap_ht_cap_flags); } if (elems.country_elem) { /* Note we are only reviewing this on beacons * for the BSSID we are associated to */ regulatory_hint_11d(local->hw.wiphy, elems.country_elem, elems.country_elem_len); /* 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); } ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, struct ieee80211_rx_status *rx_status) { struct ieee80211_local *local = sdata->local; struct ieee80211_mgmt *mgmt; u16 fc; if (skb->len < 24) return RX_DROP_MONITOR; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_REQ: case IEEE80211_STYPE_PROBE_RESP: case IEEE80211_STYPE_BEACON: memcpy(skb->cb, rx_status, sizeof(*rx_status)); case IEEE80211_STYPE_AUTH: case IEEE80211_STYPE_ASSOC_RESP: case IEEE80211_STYPE_REASSOC_RESP: case IEEE80211_STYPE_DEAUTH: case IEEE80211_STYPE_DISASSOC: skb_queue_tail(&sdata->u.mgd.skb_queue, skb); queue_work(local->hw.workqueue, &sdata->u.mgd.work); return RX_QUEUED; } return RX_DROP_MONITOR; } static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_rx_status *rx_status; struct ieee80211_mgmt *mgmt; u16 fc; rx_status = (struct ieee80211_rx_status *) skb->cb; mgmt = (struct ieee80211_mgmt *) skb->data; fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_PROBE_RESP: ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_BEACON: ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); break; case IEEE80211_STYPE_AUTH: ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_ASSOC_RESP: ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 0); break; case IEEE80211_STYPE_REASSOC_RESP: ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, 1); break; case IEEE80211_STYPE_DEAUTH: ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_DISASSOC: ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); break; } kfree_skb(skb); } 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; } set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request); queue_work(local->hw.workqueue, &ifmgd->work); } static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; /* Reset own TSF to allow time synchronization work. */ drv_reset_tsf(local); ifmgd->wmm_last_param_set = -1; /* allow any WMM update */ if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_OPEN) ifmgd->auth_alg = WLAN_AUTH_OPEN; else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) ifmgd->auth_alg = WLAN_AUTH_SHARED_KEY; else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_LEAP) ifmgd->auth_alg = WLAN_AUTH_LEAP; else if (ifmgd->auth_algs & IEEE80211_AUTH_ALG_FT) ifmgd->auth_alg = WLAN_AUTH_FT; else ifmgd->auth_alg = WLAN_AUTH_OPEN; ifmgd->auth_transaction = -1; ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED; ifmgd->assoc_scan_tries = 0; ifmgd->direct_probe_tries = 0; ifmgd->auth_tries = 0; ifmgd->assoc_tries = 0; netif_tx_stop_all_queues(sdata->dev); netif_carrier_off(sdata->dev); } static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; struct ieee80211_bss *bss; u8 *bssid = ifmgd->bssid, *ssid = ifmgd->ssid; u8 ssid_len = ifmgd->ssid_len; u16 capa_mask = WLAN_CAPABILITY_ESS; u16 capa_val = WLAN_CAPABILITY_ESS; struct ieee80211_channel *chan = local->oper_channel; if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) && ifmgd->flags & (IEEE80211_STA_AUTO_SSID_SEL | IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL)) { capa_mask |= WLAN_CAPABILITY_PRIVACY; if (sdata->default_key) capa_val |= WLAN_CAPABILITY_PRIVACY; } if (ifmgd->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) chan = NULL; if (ifmgd->flags & IEEE80211_STA_AUTO_BSSID_SEL) bssid = NULL; if (ifmgd->flags & IEEE80211_STA_AUTO_SSID_SEL) { ssid = NULL; ssid_len = 0; } bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan, bssid, ssid, ssid_len, capa_mask, capa_val); if (bss) { local->oper_channel = bss->cbss.channel; local->oper_channel_type = NL80211_CHAN_NO_HT; ieee80211_hw_config(local, 0); if (!(ifmgd->flags & IEEE80211_STA_SSID_SET)) ieee80211_sta_set_ssid(sdata, bss->ssid, bss->ssid_len); ieee80211_sta_set_bssid(sdata, bss->cbss.bssid); ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len, bss->supp_rates); if (sdata->u.mgd.mfp == IEEE80211_MFP_REQUIRED) sdata->u.mgd.flags |= IEEE80211_STA_MFP_ENABLED; else sdata->u.mgd.flags &= ~IEEE80211_STA_MFP_ENABLED; /* Send out direct probe if no probe resp was received or * the one we have is outdated */ if (!bss->last_probe_resp || time_after(jiffies, bss->last_probe_resp + IEEE80211_SCAN_RESULT_EXPIRE)) ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE; else ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE; ieee80211_rx_bss_put(local, bss); ieee80211_sta_reset_auth(sdata); return 0; } else { if (ifmgd->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) { ifmgd->assoc_scan_tries++; ieee80211_request_internal_scan(sdata, ifmgd->ssid, ssid_len); ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE; set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request); } else { ifmgd->assoc_scan_tries = 0; ifmgd->state = IEEE80211_STA_MLME_DISABLED; ieee80211_recalc_idle(local); } } return -1; } static void ieee80211_sta_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.work); struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd; struct sk_buff *skb; if (!netif_running(sdata->dev)) return; if (local->sw_scanning || local->hw_scanning) return; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) return; /* * Nothing should have been stuffed into the workqueue during * the suspend->resume cycle. If this WARN is seen then there * is a bug with either the driver suspend or something in * mac80211 stuffing into the workqueue which we haven't yet * cleared during mac80211's suspend cycle. */ if (WARN_ON(local->suspended)) return; ifmgd = &sdata->u.mgd; while ((skb = skb_dequeue(&ifmgd->skb_queue))) ieee80211_sta_rx_queued_mgmt(sdata, skb); if (ifmgd->state != IEEE80211_STA_MLME_DIRECT_PROBE && ifmgd->state != IEEE80211_STA_MLME_AUTHENTICATE && ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE && test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request)) { queue_delayed_work(local->hw.workqueue, &local->scan_work, round_jiffies_relative(0)); return; } if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request)) { if (ieee80211_sta_config_auth(sdata)) return; clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request); } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request)) return; ieee80211_recalc_idle(local); switch (ifmgd->state) { case IEEE80211_STA_MLME_DISABLED: break; case IEEE80211_STA_MLME_DIRECT_PROBE: ieee80211_direct_probe(sdata); break; case IEEE80211_STA_MLME_AUTHENTICATE: ieee80211_authenticate(sdata); break; case IEEE80211_STA_MLME_ASSOCIATE: ieee80211_associate(sdata); break; case IEEE80211_STA_MLME_ASSOCIATED: ieee80211_associated(sdata); break; default: WARN_ON(1); break; } if (ieee80211_privacy_mismatch(sdata)) { printk(KERN_DEBUG "%s: privacy configuration mismatch and " "mixed-cell disabled - disassociate\n", sdata->dev->name); ieee80211_set_disassoc(sdata, false, true, WLAN_REASON_UNSPECIFIED); } } static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) { if (sdata->vif.type == NL80211_IFTYPE_STATION) { /* * Need to update last_beacon to avoid beacon loss * test to trigger. */ sdata->u.mgd.last_beacon = jiffies; queue_work(sdata->local->hw.workqueue, &sdata->u.mgd.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->work); cancel_work_sync(&ifmgd->beacon_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); } void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 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); } #endif /* interface setup */ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd; u32 hw_flags; ifmgd = &sdata->u.mgd; INIT_WORK(&ifmgd->work, ieee80211_sta_work); INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work); INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work); setup_timer(&ifmgd->timer, ieee80211_sta_timer, (unsigned long) sdata); setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, (unsigned long) sdata); skb_queue_head_init(&ifmgd->skb_queue); ifmgd->capab = WLAN_CAPABILITY_ESS; ifmgd->auth_algs = IEEE80211_AUTH_ALG_OPEN | IEEE80211_AUTH_ALG_SHARED_KEY; ifmgd->flags |= IEEE80211_STA_CREATE_IBSS | IEEE80211_STA_AUTO_BSSID_SEL | IEEE80211_STA_AUTO_CHANNEL_SEL; if (sdata->local->hw.queues >= 4) ifmgd->flags |= IEEE80211_STA_WMM_ENABLED; hw_flags = sdata->local->hw.flags; if (hw_flags & IEEE80211_HW_SUPPORTS_PS) { ifmgd->powersave = CONFIG_MAC80211_DEFAULT_PS_VALUE; sdata->local->hw.conf.dynamic_ps_timeout = 500; } } /* configuration hooks */ void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; struct ieee80211_local *local = sdata->local; if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) return; if ((ifmgd->flags & (IEEE80211_STA_BSSID_SET | IEEE80211_STA_AUTO_BSSID_SEL)) && (ifmgd->flags & (IEEE80211_STA_SSID_SET | IEEE80211_STA_AUTO_SSID_SEL))) { if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) ieee80211_set_disassoc(sdata, true, true, WLAN_REASON_DEAUTH_LEAVING); if (ifmgd->ssid_len == 0) { /* * Only allow association to be started if a valid SSID * is configured. */ return; } if (!(ifmgd->flags & IEEE80211_STA_EXT_SME) || ifmgd->state != IEEE80211_STA_MLME_ASSOCIATE) set_bit(IEEE80211_STA_REQ_AUTH, &ifmgd->request); else if (ifmgd->flags & IEEE80211_STA_EXT_SME) set_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request); queue_work(local->hw.workqueue, &ifmgd->work); } } int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (ifmgd->ssid_len) ifmgd->flags |= IEEE80211_STA_SSID_SET; else ifmgd->flags &= ~IEEE80211_STA_SSID_SET; return 0; } int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len) { struct ieee80211_if_managed *ifmgd; if (len > IEEE80211_MAX_SSID_LEN) return -EINVAL; ifmgd = &sdata->u.mgd; if (ifmgd->ssid_len != len || memcmp(ifmgd->ssid, ssid, len) != 0) { if (ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) ieee80211_set_disassoc(sdata, true, true, WLAN_REASON_DEAUTH_LEAVING); /* * Do not use reassociation if SSID is changed (different ESS). */ ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET; memset(ifmgd->ssid, 0, sizeof(ifmgd->ssid)); memcpy(ifmgd->ssid, ssid, len); ifmgd->ssid_len = len; } return ieee80211_sta_commit(sdata); } int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; memcpy(ssid, ifmgd->ssid, ifmgd->ssid_len); *len = ifmgd->ssid_len; return 0; } int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (compare_ether_addr(bssid, ifmgd->bssid) != 0 && ifmgd->state == IEEE80211_STA_MLME_ASSOCIATED) ieee80211_set_disassoc(sdata, true, true, WLAN_REASON_DEAUTH_LEAVING); if (is_valid_ether_addr(bssid)) { memcpy(ifmgd->bssid, bssid, ETH_ALEN); ifmgd->flags |= IEEE80211_STA_BSSID_SET; } else { memset(ifmgd->bssid, 0, ETH_ALEN); ifmgd->flags &= ~IEEE80211_STA_BSSID_SET; } return ieee80211_sta_commit(sdata); } int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, const char *ie, size_t len) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; if (len == 0 && ifmgd->extra_ie_len == 0) return -EALREADY; if (len == ifmgd->extra_ie_len && ifmgd->extra_ie && memcmp(ifmgd->extra_ie, ie, len) == 0) return -EALREADY; kfree(ifmgd->extra_ie); if (len == 0) { ifmgd->extra_ie = NULL; ifmgd->extra_ie_len = 0; return 0; } ifmgd->extra_ie = kmalloc(len, GFP_KERNEL); if (!ifmgd->extra_ie) { ifmgd->extra_ie_len = 0; return -ENOMEM; } memcpy(ifmgd->extra_ie, ie, len); ifmgd->extra_ie_len = len; return 0; } int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason) { printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n", sdata->dev->name, reason); ieee80211_set_disassoc(sdata, true, true, reason); return 0; } int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n", sdata->dev->name, reason); if (!(ifmgd->flags & IEEE80211_STA_ASSOCIATED)) return -ENOLINK; ieee80211_set_disassoc(sdata, false, true, reason); return 0; } /* scan finished notification */ void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata = local->scan_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; }