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scan.c
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/*
* cfg80211 scan result handling
*
* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/nl80211.h>
#include <linux/etherdevice.h>
#include <net/arp.h>
#include <net/cfg80211.h>
#include <net/cfg80211-wext.h>
#include <net/iw_handler.h>
#include "core.h"
#include "nl80211.h"
#include "wext-compat.h"
#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
{
struct cfg80211_scan_request *request;
struct wireless_dev *wdev;
#ifdef CONFIG_CFG80211_WEXT
union iwreq_data wrqu;
#endif
ASSERT_RDEV_LOCK(rdev);
request = rdev->scan_req;
if (!request)
return;
wdev = request->wdev;
/*
* This must be before sending the other events!
* Otherwise, wpa_supplicant gets completely confused with
* wext events.
*/
if (wdev->netdev)
cfg80211_sme_scan_done(wdev->netdev);
if (request->aborted)
nl80211_send_scan_aborted(rdev, wdev);
else
nl80211_send_scan_done(rdev, wdev);
#ifdef CONFIG_CFG80211_WEXT
if (wdev->netdev && !request->aborted) {
memset(&wrqu, 0, sizeof(wrqu));
wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
}
#endif
if (wdev->netdev)
dev_put(wdev->netdev);
rdev->scan_req = NULL;
/*
* OK. If this is invoked with "leak" then we can't
* free this ... but we've cleaned it up anyway. The
* driver failed to call the scan_done callback, so
* all bets are off, it might still be trying to use
* the scan request or not ... if it accesses the dev
* in there (it shouldn't anyway) then it may crash.
*/
if (!leak)
kfree(request);
}
void __cfg80211_scan_done(struct work_struct *wk)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(wk, struct cfg80211_registered_device,
scan_done_wk);
cfg80211_lock_rdev(rdev);
___cfg80211_scan_done(rdev, false);
cfg80211_unlock_rdev(rdev);
}
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
{
WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
request->aborted = aborted;
queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
}
EXPORT_SYMBOL(cfg80211_scan_done);
void __cfg80211_sched_scan_results(struct work_struct *wk)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(wk, struct cfg80211_registered_device,
sched_scan_results_wk);
mutex_lock(&rdev->sched_scan_mtx);
/* we don't have sched_scan_req anymore if the scan is stopping */
if (rdev->sched_scan_req)
nl80211_send_sched_scan_results(rdev,
rdev->sched_scan_req->dev);
mutex_unlock(&rdev->sched_scan_mtx);
}
void cfg80211_sched_scan_results(struct wiphy *wiphy)
{
/* ignore if we're not scanning */
if (wiphy_to_dev(wiphy)->sched_scan_req)
queue_work(cfg80211_wq,
&wiphy_to_dev(wiphy)->sched_scan_results_wk);
}
EXPORT_SYMBOL(cfg80211_sched_scan_results);
void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
mutex_lock(&rdev->sched_scan_mtx);
__cfg80211_stop_sched_scan(rdev, true);
mutex_unlock(&rdev->sched_scan_mtx);
}
EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
bool driver_initiated)
{
struct net_device *dev;
lockdep_assert_held(&rdev->sched_scan_mtx);
if (!rdev->sched_scan_req)
return -ENOENT;
dev = rdev->sched_scan_req->dev;
if (!driver_initiated) {
int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
if (err)
return err;
}
nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
kfree(rdev->sched_scan_req);
rdev->sched_scan_req = NULL;
return 0;
}
static void bss_release(struct kref *ref)
{
struct cfg80211_internal_bss *bss;
bss = container_of(ref, struct cfg80211_internal_bss, ref);
if (bss->pub.free_priv)
bss->pub.free_priv(&bss->pub);
if (bss->beacon_ies_allocated)
kfree(bss->pub.beacon_ies);
if (bss->proberesp_ies_allocated)
kfree(bss->pub.proberesp_ies);
BUG_ON(atomic_read(&bss->hold));
kfree(bss);
}
/* must hold dev->bss_lock! */
void cfg80211_bss_age(struct cfg80211_registered_device *dev,
unsigned long age_secs)
{
struct cfg80211_internal_bss *bss;
unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
list_for_each_entry(bss, &dev->bss_list, list) {
bss->ts -= age_jiffies;
}
}
/* must hold dev->bss_lock! */
static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *bss)
{
list_del_init(&bss->list);
rb_erase(&bss->rbn, &dev->bss_tree);
kref_put(&bss->ref, bss_release);
}
/* must hold dev->bss_lock! */
void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
{
struct cfg80211_internal_bss *bss, *tmp;
bool expired = false;
list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
if (atomic_read(&bss->hold))
continue;
if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
continue;
__cfg80211_unlink_bss(dev, bss);
expired = true;
}
if (expired)
dev->bss_generation++;
}
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
{
while (len > 2 && ies[0] != eid) {
len -= ies[1] + 2;
ies += ies[1] + 2;
}
if (len < 2)
return NULL;
if (len < 2 + ies[1])
return NULL;
return ies;
}
EXPORT_SYMBOL(cfg80211_find_ie);
const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
const u8 *ies, int len)
{
struct ieee80211_vendor_ie *ie;
const u8 *pos = ies, *end = ies + len;
int ie_oui;
while (pos < end) {
pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
end - pos);
if (!pos)
return NULL;
if (end - pos < sizeof(*ie))
return NULL;
ie = (struct ieee80211_vendor_ie *)pos;
ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
if (ie_oui == oui && ie->oui_type == oui_type)
return pos;
pos += 2 + ie->len;
}
return NULL;
}
EXPORT_SYMBOL(cfg80211_find_vendor_ie);
static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
{
const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
/* equal if both missing */
if (!ie1 && !ie2)
return 0;
/* sort missing IE before (left of) present IE */
if (!ie1)
return -1;
if (!ie2)
return 1;
/* sort by length first, then by contents */
if (ie1[1] != ie2[1])
return ie2[1] - ie1[1];
return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
}
static bool is_bss(struct cfg80211_bss *a,
const u8 *bssid,
const u8 *ssid, size_t ssid_len)
{
const u8 *ssidie;
if (bssid && !ether_addr_equal(a->bssid, bssid))
return false;
if (!ssid)
return true;
ssidie = cfg80211_find_ie(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements);
if (!ssidie)
return false;
if (ssidie[1] != ssid_len)
return false;
return memcmp(ssidie + 2, ssid, ssid_len) == 0;
}
static bool is_mesh_bss(struct cfg80211_bss *a)
{
const u8 *ie;
if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
return false;
ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
return true;
}
static bool is_mesh(struct cfg80211_bss *a,
const u8 *meshid, size_t meshidlen,
const u8 *meshcfg)
{
const u8 *ie;
if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
return false;
ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
if (ie[1] != meshidlen)
return false;
if (memcmp(ie + 2, meshid, meshidlen))
return false;
ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
return false;
/*
* Ignore mesh capability (last two bytes of the IE) when
* comparing since that may differ between stations taking
* part in the same mesh.
*/
return memcmp(ie + 2, meshcfg,
sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
}
static int cmp_bss_core(struct cfg80211_bss *a,
struct cfg80211_bss *b)
{
int r;
if (a->channel != b->channel)
return b->channel->center_freq - a->channel->center_freq;
if (is_mesh_bss(a) && is_mesh_bss(b)) {
r = cmp_ies(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
if (r)
return r;
return cmp_ies(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
}
/*
* we can't use compare_ether_addr here since we need a < > operator.
* The binary return value of compare_ether_addr isn't enough
*/
return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
}
static int cmp_bss(struct cfg80211_bss *a,
struct cfg80211_bss *b)
{
int r;
r = cmp_bss_core(a, b);
if (r)
return r;
return cmp_ies(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
}
static int cmp_hidden_bss(struct cfg80211_bss *a,
struct cfg80211_bss *b)
{
const u8 *ie1;
const u8 *ie2;
int i;
int r;
r = cmp_bss_core(a, b);
if (r)
return r;
ie1 = cfg80211_find_ie(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements);
ie2 = cfg80211_find_ie(WLAN_EID_SSID,
b->information_elements,
b->len_information_elements);
/* Key comparator must use same algorithm in any rb-tree
* search function (order is important), otherwise ordering
* of items in the tree is broken and search gives incorrect
* results. This code uses same order as cmp_ies() does. */
/* sort missing IE before (left of) present IE */
if (!ie1)
return -1;
if (!ie2)
return 1;
/* zero-size SSID is used as an indication of the hidden bss */
if (!ie2[1])
return 0;
/* sort by length first, then by contents */
if (ie1[1] != ie2[1])
return ie2[1] - ie1[1];
/* zeroed SSID ie is another indication of a hidden bss */
for (i = 0; i < ie2[1]; i++)
if (ie2[i + 2])
return -1;
return 0;
}
struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *bssid,
const u8 *ssid, size_t ssid_len,
u16 capa_mask, u16 capa_val)
{
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
struct cfg80211_internal_bss *bss, *res = NULL;
unsigned long now = jiffies;
spin_lock_bh(&dev->bss_lock);
list_for_each_entry(bss, &dev->bss_list, list) {
if ((bss->pub.capability & capa_mask) != capa_val)
continue;
if (channel && bss->pub.channel != channel)
continue;
/* Don't get expired BSS structs */
if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
!atomic_read(&bss->hold))
continue;
if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
res = bss;
kref_get(&res->ref);
break;
}
}
spin_unlock_bh(&dev->bss_lock);
if (!res)
return NULL;
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_get_bss);
struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *meshid, size_t meshidlen,
const u8 *meshcfg)
{
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
struct cfg80211_internal_bss *bss, *res = NULL;
spin_lock_bh(&dev->bss_lock);
list_for_each_entry(bss, &dev->bss_list, list) {
if (channel && bss->pub.channel != channel)
continue;
if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
res = bss;
kref_get(&res->ref);
break;
}
}
spin_unlock_bh(&dev->bss_lock);
if (!res)
return NULL;
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_get_mesh);
static void rb_insert_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *bss)
{
struct rb_node **p = &dev->bss_tree.rb_node;
struct rb_node *parent = NULL;
struct cfg80211_internal_bss *tbss;
int cmp;
while (*p) {
parent = *p;
tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
cmp = cmp_bss(&bss->pub, &tbss->pub);
if (WARN_ON(!cmp)) {
/* will sort of leak this BSS */
return;
}
if (cmp < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&bss->rbn, parent, p);
rb_insert_color(&bss->rbn, &dev->bss_tree);
}
static struct cfg80211_internal_bss *
rb_find_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *res)
{
struct rb_node *n = dev->bss_tree.rb_node;
struct cfg80211_internal_bss *bss;
int r;
while (n) {
bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
r = cmp_bss(&res->pub, &bss->pub);
if (r == 0)
return bss;
else if (r < 0)
n = n->rb_left;
else
n = n->rb_right;
}
return NULL;
}
static struct cfg80211_internal_bss *
rb_find_hidden_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *res)
{
struct rb_node *n = dev->bss_tree.rb_node;
struct cfg80211_internal_bss *bss;
int r;
while (n) {
bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
r = cmp_hidden_bss(&res->pub, &bss->pub);
if (r == 0)
return bss;
else if (r < 0)
n = n->rb_left;
else
n = n->rb_right;
}
return NULL;
}
static void
copy_hidden_ies(struct cfg80211_internal_bss *res,
struct cfg80211_internal_bss *hidden)
{
if (unlikely(res->pub.beacon_ies))
return;
if (WARN_ON(!hidden->pub.beacon_ies))
return;
res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
if (unlikely(!res->pub.beacon_ies))
return;
res->beacon_ies_allocated = true;
res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
res->pub.len_beacon_ies);
}
static struct cfg80211_internal_bss *
cfg80211_bss_update(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *res)
{
struct cfg80211_internal_bss *found = NULL;
/*
* The reference to "res" is donated to this function.
*/
if (WARN_ON(!res->pub.channel)) {
kref_put(&res->ref, bss_release);
return NULL;
}
res->ts = jiffies;
spin_lock_bh(&dev->bss_lock);
found = rb_find_bss(dev, res);
if (found) {
found->pub.beacon_interval = res->pub.beacon_interval;
found->pub.tsf = res->pub.tsf;
found->pub.signal = res->pub.signal;
found->pub.capability = res->pub.capability;
found->ts = res->ts;
/* Update IEs */
if (res->pub.proberesp_ies) {
size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
size_t ielen = res->pub.len_proberesp_ies;
if (found->pub.proberesp_ies &&
!found->proberesp_ies_allocated &&
ksize(found) >= used + ielen) {
memcpy(found->pub.proberesp_ies,
res->pub.proberesp_ies, ielen);
found->pub.len_proberesp_ies = ielen;
} else {
u8 *ies = found->pub.proberesp_ies;
if (found->proberesp_ies_allocated)
ies = krealloc(ies, ielen, GFP_ATOMIC);
else
ies = kmalloc(ielen, GFP_ATOMIC);
if (ies) {
memcpy(ies, res->pub.proberesp_ies,
ielen);
found->proberesp_ies_allocated = true;
found->pub.proberesp_ies = ies;
found->pub.len_proberesp_ies = ielen;
}
}
/* Override possible earlier Beacon frame IEs */
found->pub.information_elements =
found->pub.proberesp_ies;
found->pub.len_information_elements =
found->pub.len_proberesp_ies;
}
if (res->pub.beacon_ies) {
size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
size_t ielen = res->pub.len_beacon_ies;
bool information_elements_is_beacon_ies =
(found->pub.information_elements ==
found->pub.beacon_ies);
if (found->pub.beacon_ies &&
!found->beacon_ies_allocated &&
ksize(found) >= used + ielen) {
memcpy(found->pub.beacon_ies,
res->pub.beacon_ies, ielen);
found->pub.len_beacon_ies = ielen;
} else {
u8 *ies = found->pub.beacon_ies;
if (found->beacon_ies_allocated)
ies = krealloc(ies, ielen, GFP_ATOMIC);
else
ies = kmalloc(ielen, GFP_ATOMIC);
if (ies) {
memcpy(ies, res->pub.beacon_ies,
ielen);
found->beacon_ies_allocated = true;
found->pub.beacon_ies = ies;
found->pub.len_beacon_ies = ielen;
}
}
/* Override IEs if they were from a beacon before */
if (information_elements_is_beacon_ies) {
found->pub.information_elements =
found->pub.beacon_ies;
found->pub.len_information_elements =
found->pub.len_beacon_ies;
}
}
kref_put(&res->ref, bss_release);
} else {
struct cfg80211_internal_bss *hidden;
/* First check if the beacon is a probe response from
* a hidden bss. If so, copy beacon ies (with nullified
* ssid) into the probe response bss entry (with real ssid).
* It is required basically for PSM implementation
* (probe responses do not contain tim ie) */
/* TODO: The code is not trying to update existing probe
* response bss entries when beacon ies are
* getting changed. */
hidden = rb_find_hidden_bss(dev, res);
if (hidden)
copy_hidden_ies(res, hidden);
/* this "consumes" the reference */
list_add_tail(&res->list, &dev->bss_list);
rb_insert_bss(dev, res);
found = res;
}
dev->bss_generation++;
spin_unlock_bh(&dev->bss_lock);
kref_get(&found->ref);
return found;
}
struct cfg80211_bss*
cfg80211_inform_bss(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *bssid, u64 tsf, u16 capability,
u16 beacon_interval, const u8 *ie, size_t ielen,
s32 signal, gfp_t gfp)
{
struct cfg80211_internal_bss *res;
size_t privsz;
if (WARN_ON(!wiphy))
return NULL;
privsz = wiphy->bss_priv_size;
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
(signal < 0 || signal > 100)))
return NULL;
res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
if (!res)
return NULL;
memcpy(res->pub.bssid, bssid, ETH_ALEN);
res->pub.channel = channel;
res->pub.signal = signal;
res->pub.tsf = tsf;
res->pub.beacon_interval = beacon_interval;
res->pub.capability = capability;
/*
* Since we do not know here whether the IEs are from a Beacon or Probe
* Response frame, we need to pick one of the options and only use it
* with the driver that does not provide the full Beacon/Probe Response
* frame. Use Beacon frame pointer to avoid indicating that this should
* override the information_elements pointer should we have received an
* earlier indication of Probe Response data.
*
* The initial buffer for the IEs is allocated with the BSS entry and
* is located after the private area.
*/
res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
memcpy(res->pub.beacon_ies, ie, ielen);
res->pub.len_beacon_ies = ielen;
res->pub.information_elements = res->pub.beacon_ies;
res->pub.len_information_elements = res->pub.len_beacon_ies;
kref_init(&res->ref);
res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
if (!res)
return NULL;
if (res->pub.capability & WLAN_CAPABILITY_ESS)
regulatory_hint_found_beacon(wiphy, channel, gfp);
/* cfg80211_bss_update gives us a referenced result */
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_inform_bss);
struct cfg80211_bss *
cfg80211_inform_bss_frame(struct wiphy *wiphy,
struct ieee80211_channel *channel,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, gfp_t gfp)
{
struct cfg80211_internal_bss *res;
size_t ielen = len - offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
size_t privsz;
if (WARN_ON(!mgmt))
return NULL;
if (WARN_ON(!wiphy))
return NULL;
if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
(signal < 0 || signal > 100)))
return NULL;
if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
return NULL;
privsz = wiphy->bss_priv_size;
res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
if (!res)
return NULL;
memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
res->pub.channel = channel;
res->pub.signal = signal;
res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
/*
* The initial buffer for the IEs is allocated with the BSS entry and
* is located after the private area.
*/
if (ieee80211_is_probe_resp(mgmt->frame_control)) {
res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
ielen);
res->pub.len_proberesp_ies = ielen;
res->pub.information_elements = res->pub.proberesp_ies;
res->pub.len_information_elements = res->pub.len_proberesp_ies;
} else {
res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
res->pub.len_beacon_ies = ielen;
res->pub.information_elements = res->pub.beacon_ies;
res->pub.len_information_elements = res->pub.len_beacon_ies;
}
kref_init(&res->ref);
res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
if (!res)
return NULL;
if (res->pub.capability & WLAN_CAPABILITY_ESS)
regulatory_hint_found_beacon(wiphy, channel, gfp);
/* cfg80211_bss_update gives us a referenced result */
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_inform_bss_frame);
void cfg80211_ref_bss(struct cfg80211_bss *pub)
{
struct cfg80211_internal_bss *bss;
if (!pub)
return;
bss = container_of(pub, struct cfg80211_internal_bss, pub);
kref_get(&bss->ref);
}
EXPORT_SYMBOL(cfg80211_ref_bss);
void cfg80211_put_bss(struct cfg80211_bss *pub)
{
struct cfg80211_internal_bss *bss;
if (!pub)
return;
bss = container_of(pub, struct cfg80211_internal_bss, pub);
kref_put(&bss->ref, bss_release);
}
EXPORT_SYMBOL(cfg80211_put_bss);
void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
{
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
struct cfg80211_internal_bss *bss;
if (WARN_ON(!pub))
return;
bss = container_of(pub, struct cfg80211_internal_bss, pub);
spin_lock_bh(&dev->bss_lock);
if (!list_empty(&bss->list)) {
__cfg80211_unlink_bss(dev, bss);
dev->bss_generation++;
}
spin_unlock_bh(&dev->bss_lock);
}
EXPORT_SYMBOL(cfg80211_unlink_bss);
#ifdef CONFIG_CFG80211_WEXT
int cfg80211_wext_siwscan(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
struct cfg80211_registered_device *rdev;
struct wiphy *wiphy;
struct iw_scan_req *wreq = NULL;
struct cfg80211_scan_request *creq = NULL;
int i, err, n_channels = 0;
enum ieee80211_band band;
if (!netif_running(dev))
return -ENETDOWN;
if (wrqu->data.length == sizeof(struct iw_scan_req))
wreq = (struct iw_scan_req *)extra;
rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
if (rdev->scan_req) {
err = -EBUSY;
goto out;
}
wiphy = &rdev->wiphy;
/* Determine number of channels, needed to allocate creq */
if (wreq && wreq->num_channels)
n_channels = wreq->num_channels;
else {
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
if (wiphy->bands[band])
n_channels += wiphy->bands[band]->n_channels;
}
creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
n_channels * sizeof(void *),
GFP_ATOMIC);
if (!creq) {
err = -ENOMEM;
goto out;
}
creq->wiphy = wiphy;
creq->wdev = dev->ieee80211_ptr;
/* SSIDs come after channels */
creq->ssids = (void *)&creq->channels[n_channels];
creq->n_channels = n_channels;
creq->n_ssids = 1;
/* translate "Scan on frequencies" request */
i = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
int j;
if (!wiphy->bands[band])
continue;
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
/* ignore disabled channels */
if (wiphy->bands[band]->channels[j].flags &
IEEE80211_CHAN_DISABLED)
continue;
/* If we have a wireless request structure and the
* wireless request specifies frequencies, then search
* for the matching hardware channel.
*/
if (wreq && wreq->num_channels) {
int k;
int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
for (k = 0; k < wreq->num_channels; k++) {
int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
if (wext_freq == wiphy_freq)
goto wext_freq_found;
}
goto wext_freq_not_found;
}
wext_freq_found:
creq->channels[i] = &wiphy->bands[band]->channels[j];
i++;
wext_freq_not_found: ;
}
}