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linux/net/mac80211/scan.c
Johannes Berg 9116dd0112 mac80211: clarify scan request 
When a scan is requested for non-STA interfaces, we simply fire
off a scan, but for STA interfaces we shouldn't because they
could be in the middle of an association. This clarifies the
corresponding code.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-09-11 15:53:37 -04:00

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/*
* Scanning implementation
*
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
* Copyright 2004, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.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.
*/
/* TODO:
* order BSS list by RSSI(?) ("quality of AP")
* scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
* SSID)
*/
#include <linux/wireless.h>
#include <linux/if_arp.h>
#include <net/mac80211.h>
#include <net/iw_handler.h>
#include "ieee80211_i.h"
#include "mesh.h"
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
{
spin_lock_init(&local->sta_bss_lock);
INIT_LIST_HEAD(&local->sta_bss_list);
}
void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
{
struct ieee80211_sta_bss *bss, *tmp;
list_for_each_entry_safe(bss, tmp, &local->sta_bss_list, list)
ieee80211_rx_bss_put(local, bss);
}
struct ieee80211_sta_bss *
ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
u8 *ssid, u8 ssid_len)
{
struct ieee80211_sta_bss *bss;
spin_lock_bh(&local->sta_bss_lock);
bss = local->sta_bss_hash[STA_HASH(bssid)];
while (bss) {
if (!bss_mesh_cfg(bss) &&
!memcmp(bss->bssid, bssid, ETH_ALEN) &&
bss->freq == freq &&
bss->ssid_len == ssid_len &&
(ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
atomic_inc(&bss->users);
break;
}
bss = bss->hnext;
}
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
struct ieee80211_sta_bss *bss)
{
u8 hash_idx;
if (bss_mesh_cfg(bss))
hash_idx = mesh_id_hash(bss_mesh_id(bss),
bss_mesh_id_len(bss));
else
hash_idx = STA_HASH(bss->bssid);
bss->hnext = local->sta_bss_hash[hash_idx];
local->sta_bss_hash[hash_idx] = bss;
}
/* Caller must hold local->sta_bss_lock */
static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
struct ieee80211_sta_bss *bss)
{
struct ieee80211_sta_bss *b, *prev = NULL;
b = local->sta_bss_hash[STA_HASH(bss->bssid)];
while (b) {
if (b == bss) {
if (!prev)
local->sta_bss_hash[STA_HASH(bss->bssid)] =
bss->hnext;
else
prev->hnext = bss->hnext;
break;
}
prev = b;
b = b->hnext;
}
}
struct ieee80211_sta_bss *
ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
u8 *ssid, u8 ssid_len)
{
struct ieee80211_sta_bss *bss;
bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
if (!bss)
return NULL;
atomic_set(&bss->users, 2);
memcpy(bss->bssid, bssid, ETH_ALEN);
bss->freq = freq;
if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
memcpy(bss->ssid, ssid, ssid_len);
bss->ssid_len = ssid_len;
}
spin_lock_bh(&local->sta_bss_lock);
/* TODO: order by RSSI? */
list_add_tail(&bss->list, &local->sta_bss_list);
__ieee80211_rx_bss_hash_add(local, bss);
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
#ifdef CONFIG_MAC80211_MESH
static struct ieee80211_sta_bss *
ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
u8 *mesh_cfg, int freq)
{
struct ieee80211_sta_bss *bss;
spin_lock_bh(&local->sta_bss_lock);
bss = local->sta_bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
while (bss) {
if (bss_mesh_cfg(bss) &&
!memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
bss->freq == freq &&
mesh_id_len == bss->mesh_id_len &&
(mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
mesh_id_len))) {
atomic_inc(&bss->users);
break;
}
bss = bss->hnext;
}
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
static struct ieee80211_sta_bss *
ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
u8 *mesh_cfg, int mesh_config_len, int freq)
{
struct ieee80211_sta_bss *bss;
if (mesh_config_len != MESH_CFG_LEN)
return NULL;
bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
if (!bss)
return NULL;
bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
if (!bss->mesh_cfg) {
kfree(bss);
return NULL;
}
if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
if (!bss->mesh_id) {
kfree(bss->mesh_cfg);
kfree(bss);
return NULL;
}
memcpy(bss->mesh_id, mesh_id, mesh_id_len);
}
atomic_set(&bss->users, 2);
memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
bss->mesh_id_len = mesh_id_len;
bss->freq = freq;
spin_lock_bh(&local->sta_bss_lock);
/* TODO: order by RSSI? */
list_add_tail(&bss->list, &local->sta_bss_list);
__ieee80211_rx_bss_hash_add(local, bss);
spin_unlock_bh(&local->sta_bss_lock);
return bss;
}
#endif
static void ieee80211_rx_bss_free(struct ieee80211_sta_bss *bss)
{
kfree(bss->ies);
kfree(bss_mesh_id(bss));
kfree(bss_mesh_cfg(bss));
kfree(bss);
}
void ieee80211_rx_bss_put(struct ieee80211_local *local,
struct ieee80211_sta_bss *bss)
{
local_bh_disable();
if (!atomic_dec_and_lock(&bss->users, &local->sta_bss_lock)) {
local_bh_enable();
return;
}
__ieee80211_rx_bss_hash_del(local, bss);
list_del(&bss->list);
spin_unlock_bh(&local->sta_bss_lock);
ieee80211_rx_bss_free(bss);
}
struct ieee80211_sta_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_rx_status *rx_status,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee802_11_elems *elems,
int freq, bool beacon)
{
struct ieee80211_sta_bss *bss;
int clen;
#ifdef CONFIG_MAC80211_MESH
if (elems->mesh_config)
bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
elems->mesh_id_len, elems->mesh_config, freq);
else
#endif
bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
elems->ssid, elems->ssid_len);
if (!bss) {
#ifdef CONFIG_MAC80211_MESH
if (elems->mesh_config)
bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
elems->mesh_id_len, elems->mesh_config,
elems->mesh_config_len, freq);
else
#endif
bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
elems->ssid, elems->ssid_len);
if (!bss)
return NULL;
} else {
#if 0
/* TODO: order by RSSI? */
spin_lock_bh(&local->sta_bss_lock);
list_move_tail(&bss->list, &local->sta_bss_list);
spin_unlock_bh(&local->sta_bss_lock);
#endif
}
/* save the ERP value so that it is available at association time */
if (elems->erp_info && elems->erp_info_len >= 1) {
bss->erp_value = elems->erp_info[0];
bss->has_erp_value = 1;
}
bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
if (elems->tim) {
struct ieee80211_tim_ie *tim_ie =
(struct ieee80211_tim_ie *)elems->tim;
bss->dtim_period = tim_ie->dtim_period;
}
/* set default value for buggy APs */
if (!elems->tim || bss->dtim_period == 0)
bss->dtim_period = 1;
bss->supp_rates_len = 0;
if (elems->supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
if (clen > elems->supp_rates_len)
clen = elems->supp_rates_len;
memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
clen);
bss->supp_rates_len += clen;
}
if (elems->ext_supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
if (clen > elems->ext_supp_rates_len)
clen = elems->ext_supp_rates_len;
memcpy(&bss->supp_rates[bss->supp_rates_len],
elems->ext_supp_rates, clen);
bss->supp_rates_len += clen;
}
bss->band = rx_status->band;
bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
bss->last_update = jiffies;
bss->signal = rx_status->signal;
bss->noise = rx_status->noise;
bss->qual = rx_status->qual;
bss->wmm_used = elems->wmm_param || elems->wmm_info;
if (!beacon)
bss->last_probe_resp = jiffies;
/*
* For probe responses, or if we don't have any information yet,
* use the IEs from the beacon.
*/
if (!bss->ies || !beacon) {
if (bss->ies == NULL || bss->ies_len < elems->total_len) {
kfree(bss->ies);
bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
}
if (bss->ies) {
memcpy(bss->ies, elems->ie_start, elems->total_len);
bss->ies_len = elems->total_len;
} else
bss->ies_len = 0;
}
return bss;
}
ieee80211_rx_result
ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
struct ieee80211_rx_status *rx_status)
{
struct ieee80211_mgmt *mgmt;
struct ieee80211_sta_bss *bss;
u8 *elements;
struct ieee80211_channel *channel;
size_t baselen;
int freq;
__le16 fc;
bool presp, beacon = false;
struct ieee802_11_elems elems;
if (skb->len < 2)
return RX_DROP_UNUSABLE;
mgmt = (struct ieee80211_mgmt *) skb->data;
fc = mgmt->frame_control;
if (ieee80211_is_ctl(fc))
return RX_CONTINUE;
if (skb->len < 24)
return RX_DROP_MONITOR;
presp = ieee80211_is_probe_resp(fc);
if (presp) {
/* ignore ProbeResp to foreign address */
if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
return RX_DROP_MONITOR;
presp = true;
elements = mgmt->u.probe_resp.variable;
baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
} else {
beacon = ieee80211_is_beacon(fc);
baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
elements = mgmt->u.beacon.variable;
}
if (!presp && !beacon)
return RX_CONTINUE;
if (baselen > skb->len)
return RX_DROP_MONITOR;
ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
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(sdata->local->hw.wiphy, freq);
if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
return RX_DROP_MONITOR;
bss = ieee80211_bss_info_update(sdata->local, rx_status,
mgmt, skb->len, &elems,
freq, beacon);
ieee80211_rx_bss_put(sdata->local, bss);
dev_kfree_skb(skb);
return RX_QUEUED;
}
static 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;
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.sta.bssid, ETH_ALEN);
memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
ieee80211_sta_tx(sdata, skb, 0);
}
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_sta_timer((unsigned long)sdata);
}
void ieee80211_scan_completed(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
union iwreq_data wrqu;
local->last_scan_completed = jiffies;
memset(&wrqu, 0, sizeof(wrqu));
wireless_send_event(local->scan_sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
if (local->sta_hw_scanning) {
local->sta_hw_scanning = 0;
if (ieee80211_hw_config(local))
printk(KERN_DEBUG "%s: failed to restore operational "
"channel after scan\n", wiphy_name(local->hw.wiphy));
/* Restart STA timer for HW scan case */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list)
ieee80211_restart_sta_timer(sdata);
rcu_read_unlock();
goto done;
}
local->sta_sw_scanning = 0;
if (ieee80211_hw_config(local))
printk(KERN_DEBUG "%s: failed to restore operational "
"channel after scan\n", wiphy_name(local->hw.wiphy));
netif_tx_lock_bh(local->mdev);
netif_addr_lock(local->mdev);
local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
local->ops->configure_filter(local_to_hw(local),
FIF_BCN_PRBRESP_PROMISC,
&local->filter_flags,
local->mdev->mc_count,
local->mdev->mc_list);
netif_addr_unlock(local->mdev);
netif_tx_unlock_bh(local->mdev);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
/* Tell AP we're back */
if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
ieee80211_send_nullfunc(local, sdata, 0);
netif_tx_wake_all_queues(sdata->dev);
}
} else
netif_tx_wake_all_queues(sdata->dev);
ieee80211_restart_sta_timer(sdata);
}
rcu_read_unlock();
done:
ieee80211_mlme_notify_scan_completed(local);
}
EXPORT_SYMBOL(ieee80211_scan_completed);
void ieee80211_sta_scan_work(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, scan_work.work);
struct ieee80211_sub_if_data *sdata = local->scan_sdata;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
int skip;
unsigned long next_delay = 0;
if (!local->sta_sw_scanning)
return;
switch (local->scan_state) {
case SCAN_SET_CHANNEL:
/*
* Get current scan band. scan_band may be IEEE80211_NUM_BANDS
* after we successfully scanned the last channel of the last
* band (and the last band is supported by the hw)
*/
if (local->scan_band < IEEE80211_NUM_BANDS)
sband = local->hw.wiphy->bands[local->scan_band];
else
sband = NULL;
/*
* If we are at an unsupported band and have more bands
* left to scan, advance to the next supported one.
*/
while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
local->scan_band++;
sband = local->hw.wiphy->bands[local->scan_band];
local->scan_channel_idx = 0;
}
/* if no more bands/channels left, complete scan */
if (!sband || local->scan_channel_idx >= sband->n_channels) {
ieee80211_scan_completed(local_to_hw(local));
return;
}
skip = 0;
chan = &sband->channels[local->scan_channel_idx];
if (chan->flags & IEEE80211_CHAN_DISABLED ||
(sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
chan->flags & IEEE80211_CHAN_NO_IBSS))
skip = 1;
if (!skip) {
local->scan_channel = chan;
if (ieee80211_hw_config(local)) {
printk(KERN_DEBUG "%s: failed to set freq to "
"%d MHz for scan\n", wiphy_name(local->hw.wiphy),
chan->center_freq);
skip = 1;
}
}
/* advance state machine to next channel/band */
local->scan_channel_idx++;
if (local->scan_channel_idx >= sband->n_channels) {
/*
* scan_band may end up == IEEE80211_NUM_BANDS, but
* we'll catch that case above and complete the scan
* if that is the case.
*/
local->scan_band++;
local->scan_channel_idx = 0;
}
if (skip)
break;
next_delay = IEEE80211_PROBE_DELAY +
usecs_to_jiffies(local->hw.channel_change_time);
local->scan_state = SCAN_SEND_PROBE;
break;
case SCAN_SEND_PROBE:
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
local->scan_state = SCAN_SET_CHANNEL;
if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
break;
ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
local->scan_ssid_len);
next_delay = IEEE80211_CHANNEL_TIME;
break;
}
if (local->sta_sw_scanning)
queue_delayed_work(local->hw.workqueue, &local->scan_work,
next_delay);
}
int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
u8 *ssid, size_t ssid_len)
{
struct ieee80211_local *local = scan_sdata->local;
struct ieee80211_sub_if_data *sdata;
if (ssid_len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
/* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
* BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
* BSSID: MACAddress
* SSID
* ScanType: ACTIVE, PASSIVE
* ProbeDelay: delay (in microseconds) to be used prior to transmitting
* a Probe frame during active scanning
* ChannelList
* MinChannelTime (>= ProbeDelay), in TU
* MaxChannelTime: (>= MinChannelTime), in TU
*/
/* MLME-SCAN.confirm
* BSSDescriptionSet
* ResultCode: SUCCESS, INVALID_PARAMETERS
*/
if (local->sta_sw_scanning || local->sta_hw_scanning) {
if (local->scan_sdata == scan_sdata)
return 0;
return -EBUSY;
}
if (local->ops->hw_scan) {
int rc = local->ops->hw_scan(local_to_hw(local),
ssid, ssid_len);
if (!rc) {
local->sta_hw_scanning = 1;
local->scan_sdata = scan_sdata;
}
return rc;
}
local->sta_sw_scanning = 1;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
netif_tx_stop_all_queues(sdata->dev);
ieee80211_send_nullfunc(local, sdata, 1);
}
} else
netif_tx_stop_all_queues(sdata->dev);
}
rcu_read_unlock();
if (ssid) {
local->scan_ssid_len = ssid_len;
memcpy(local->scan_ssid, ssid, ssid_len);
} else
local->scan_ssid_len = 0;
local->scan_state = SCAN_SET_CHANNEL;
local->scan_channel_idx = 0;
local->scan_band = IEEE80211_BAND_2GHZ;
local->scan_sdata = scan_sdata;
netif_addr_lock_bh(local->mdev);
local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
local->ops->configure_filter(local_to_hw(local),
FIF_BCN_PRBRESP_PROMISC,
&local->filter_flags,
local->mdev->mc_count,
local->mdev->mc_list);
netif_addr_unlock_bh(local->mdev);
/* TODO: start scan as soon as all nullfunc frames are ACKed */
queue_delayed_work(local->hw.workqueue, &local->scan_work,
IEEE80211_CHANNEL_TIME);
return 0;
}
int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_sta *ifsta;
if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
return ieee80211_sta_start_scan(sdata, ssid, ssid_len);
/*
* STA has a state machine that might need to defer scanning
* while it's trying to associate/authenticate, therefore we
* queue it up to the state machine in that case.
*/
if (local->sta_sw_scanning || local->sta_hw_scanning) {
if (local->scan_sdata == sdata)
return 0;
return -EBUSY;
}
ifsta = &sdata->u.sta;
ifsta->scan_ssid_len = ssid_len;
if (ssid_len)
memcpy(ifsta->scan_ssid, ssid, ssid_len);
set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
return 0;
}
static void ieee80211_sta_add_scan_ies(struct iw_request_info *info,
struct ieee80211_sta_bss *bss,
char **current_ev, char *end_buf)
{
u8 *pos, *end, *next;
struct iw_event iwe;
if (bss == NULL || bss->ies == NULL)
return;
/*
* If needed, fragment the IEs buffer (at IE boundaries) into short
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
*/
pos = bss->ies;
end = pos + bss->ies_len;
while (end - pos > IW_GENERIC_IE_MAX) {
next = pos + 2 + pos[1];
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
next = next + 2 + next[1];
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = next - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
pos = next;
}
if (end > pos) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = end - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
}
}
static char *
ieee80211_sta_scan_result(struct ieee80211_local *local,
struct iw_request_info *info,
struct ieee80211_sta_bss *bss,
char *current_ev, char *end_buf)
{
struct iw_event iwe;
char *buf;
if (time_after(jiffies,
bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
return current_ev;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_ADDR_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
if (bss_mesh_cfg(bss)) {
iwe.u.data.length = bss_mesh_id_len(bss);
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, bss_mesh_id(bss));
} else {
iwe.u.data.length = bss->ssid_len;
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, bss->ssid);
}
if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
|| bss_mesh_cfg(bss)) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWMODE;
if (bss_mesh_cfg(bss))
iwe.u.mode = IW_MODE_MESH;
else if (bss->capability & WLAN_CAPABILITY_ESS)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
&iwe, IW_EV_UINT_LEN);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
iwe.u.freq.e = 0;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = bss->freq;
iwe.u.freq.e = 6;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVQUAL;
iwe.u.qual.qual = bss->qual;
iwe.u.qual.level = bss->signal;
iwe.u.qual.noise = bss->noise;
iwe.u.qual.updated = local->wstats_flags;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_QUAL_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWENCODE;
if (bss->capability & WLAN_CAPABILITY_PRIVACY)
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
iwe.u.data.length = 0;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, "");
ieee80211_sta_add_scan_ies(info, bss, &current_ev, end_buf);
if (bss->supp_rates_len > 0) {
/* display all supported rates in readable format */
char *p = current_ev + iwe_stream_lcp_len(info);
int i;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWRATE;
/* Those two flags are ignored... */
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
for (i = 0; i < bss->supp_rates_len; i++) {
iwe.u.bitrate.value = ((bss->supp_rates[i] &
0x7f) * 500000);
p = iwe_stream_add_value(info, current_ev, p,
end_buf, &iwe, IW_EV_PARAM_LEN);
}
current_ev = p;
}
buf = kmalloc(30, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, buf);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, " Last beacon: %dms ago",
jiffies_to_msecs(jiffies - bss->last_update));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf, &iwe, buf);
kfree(buf);
}
if (bss_mesh_cfg(bss)) {
u8 *cfg = bss_mesh_cfg(bss);
buf = kmalloc(50, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "Mesh network (version %d)", cfg[0]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Protocol ID: "
"0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
cfg[4]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Metric ID: "
"0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
cfg[8]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Congestion Control Mode ID: "
"0x%02X%02X%02X%02X", cfg[9], cfg[10],
cfg[11], cfg[12]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Channel Precedence: "
"0x%02X%02X%02X%02X", cfg[13], cfg[14],
cfg[15], cfg[16]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
kfree(buf);
}
}
return current_ev;
}
int ieee80211_sta_scan_results(struct ieee80211_local *local,
struct iw_request_info *info,
char *buf, size_t len)
{
char *current_ev = buf;
char *end_buf = buf + len;
struct ieee80211_sta_bss *bss;
spin_lock_bh(&local->sta_bss_lock);
list_for_each_entry(bss, &local->sta_bss_list, list) {
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
spin_unlock_bh(&local->sta_bss_lock);
return -E2BIG;
}
current_ev = ieee80211_sta_scan_result(local, info, bss,
current_ev, end_buf);
}
spin_unlock_bh(&local->sta_bss_lock);
return current_ev - buf;
}
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