net/mac80211/spectmgmt.c

   1 /*
   2  * spectrum management
   3  *
   4  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  * Copyright 2007-2008, Intel Corporation
  10  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/ieee80211.h>
  18 #include <net/cfg80211.h>
  19 #include <net/mac80211.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "wme.h"
  23
  24 static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
  25                                         struct ieee80211_msrment_ie *request_ie,
  26                                         const u8 *da, const u8 *bssid,
  27                                         u8 dialog_token)
  28 {
  29         struct ieee80211_local *local = sdata->local;
  30         struct sk_buff *skb;
  31         struct ieee80211_mgmt *msr_report;
  32
  33         skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
  34                                 sizeof(struct ieee80211_msrment_ie));
  35         if (!skb)
  36                 return;
  37
  38         skb_reserve(skb, local->hw.extra_tx_headroom);
  39         msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
  40         memset(msr_report, 0, 24);
  41         memcpy(msr_report->da, da, ETH_ALEN);
  42         memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
  43         memcpy(msr_report->bssid, bssid, ETH_ALEN);
  44         msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  45                                                 IEEE80211_STYPE_ACTION);
  46
  47         skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
  48         msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
  49         msr_report->u.action.u.measurement.action_code =
  50                                 WLAN_ACTION_SPCT_MSR_RPRT;
  51         msr_report->u.action.u.measurement.dialog_token = dialog_token;
  52
  53         msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
  54         msr_report->u.action.u.measurement.length =
  55                         sizeof(struct ieee80211_msrment_ie);
  56
  57         memset(&msr_report->u.action.u.measurement.msr_elem, 0,
  58                 sizeof(struct ieee80211_msrment_ie));
  59         msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
  60         msr_report->u.action.u.measurement.msr_elem.mode |=
  61                         IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
  62         msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
  63
  64         ieee80211_tx_skb(sdata, skb);
  65 }
  66
  67 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
  68                                        struct ieee80211_mgmt *mgmt,
  69                                        size_t len)
  70 {
  71         /*
  72          * Ignoring measurement request is spec violation.
  73          * Mandatory measurements must be reported optional
  74          * measurements might be refused or reported incapable
  75          * For now just refuse
  76          * TODO: Answer basic measurement as unmeasured
  77          */
  78         ieee80211_send_refuse_measurement_request(sdata,
  79                         &mgmt->u.action.u.measurement.msr_elem,
  80                         mgmt->sa, mgmt->bssid,
  81                         mgmt->u.action.u.measurement.dialog_token);
  82 }