/* * spectrum management * * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> * Copyright 2007, Michael Wu <flamingice@sourmilk.net> * Copyright 2007-2008, Intel Corporation * Copyright 2008, Johannes Berg <johannes@sipsolutions.net> * * 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 <linux/ieee80211.h> #include <net/wireless.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "sta_info.h" #include "wme.h" static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata, struct ieee80211_msrment_ie *request_ie, const u8 *da, const u8 *bssid, u8 dialog_token) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *msr_report; skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom + sizeof(struct ieee80211_msrment_ie)); if (!skb) { printk(KERN_ERR "%s: failed to allocate buffer for " "measurement report frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24); memset(msr_report, 0, 24); memcpy(msr_report->da, da, ETH_ALEN); memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(msr_report->bssid, bssid, ETH_ALEN); msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement)); msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT; msr_report->u.action.u.measurement.action_code = WLAN_ACTION_SPCT_MSR_RPRT; msr_report->u.action.u.measurement.dialog_token = dialog_token; msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT; msr_report->u.action.u.measurement.length = sizeof(struct ieee80211_msrment_ie); memset(&msr_report->u.action.u.measurement.msr_elem, 0, sizeof(struct ieee80211_msrment_ie)); msr_report->u.action.u.measurement.msr_elem.token = request_ie->token; msr_report->u.action.u.measurement.msr_elem.mode |= IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED; msr_report->u.action.u.measurement.msr_elem.type = request_ie->type; ieee80211_tx_skb(sdata, skb, 1); } void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len) { /* * Ignoring measurement request is spec violation. * Mandatory measurements must be reported optional * measurements might be refused or reported incapable * For now just refuse * TODO: Answer basic measurement as unmeasured */ ieee80211_send_refuse_measurement_request(sdata, &mgmt->u.action.u.measurement.msr_elem, mgmt->sa, mgmt->bssid, mgmt->u.action.u.measurement.dialog_token); } 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); } 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; queue_work(sdata->local->hw.workqueue, &ifmgd->chswitch_work); } void ieee80211_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); /* FIXME: Handle ADHOC later */ if (sdata->vif.type != NL80211_IFTYPE_STATION) return; 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)); } } 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); } }