LXR linux/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/wireless.h>
  19#include <net/mac80211.h>
  20#include "ieee80211_i.h"
  21#include "sta_info.h"
  22#include "wme.h"
  23
  24static 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
  36        if (!skb) {
  37                printk(KERN_ERR "%s: failed to allocate buffer for "
  38                                "measurement report frame\n", sdata->dev->name);
  39                return;
  40        }
  41
  42        skb_reserve(skb, local->hw.extra_tx_headroom);
  43        msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
  44        memset(msr_report, 0, 24);
  45        memcpy(msr_report->da, da, ETH_ALEN);
  46        memcpy(msr_report->sa, sdata->dev->dev_addr, ETH_ALEN);
  47        memcpy(msr_report->bssid, bssid, ETH_ALEN);
  48        msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  49                                                IEEE80211_STYPE_ACTION);
  50
  51        skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
  52        msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
  53        msr_report->u.action.u.measurement.action_code =
  54                                WLAN_ACTION_SPCT_MSR_RPRT;
  55        msr_report->u.action.u.measurement.dialog_token = dialog_token;
  56
  57        msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
  58        msr_report->u.action.u.measurement.length =
  59                        sizeof(struct ieee80211_msrment_ie);
  60
  61        memset(&msr_report->u.action.u.measurement.msr_elem, 0,
  62                sizeof(struct ieee80211_msrment_ie));
  63        msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
  64        msr_report->u.action.u.measurement.msr_elem.mode |=
  65                        IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
  66        msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
  67
  68        ieee80211_tx_skb(sdata, skb, 0);
  69}
  70
  71void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
  72                                       struct ieee80211_mgmt *mgmt,
  73                                       size_t len)
  74{
  75        /*
  76         * Ignoring measurement request is spec violation.
  77         * Mandatory measurements must be reported optional
  78         * measurements might be refused or reported incapable
  79         * For now just refuse
  80         * TODO: Answer basic measurement as unmeasured
  81         */
  82        ieee80211_send_refuse_measurement_request(sdata,
  83                        &mgmt->u.action.u.measurement.msr_elem,
  84                        mgmt->sa, mgmt->bssid,
  85                        mgmt->u.action.u.measurement.dialog_token);
  86}
  87