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Diffstat (limited to 'net/wireless/scan.c')
-rw-r--r--net/wireless/scan.c91
1 files changed, 71 insertions, 20 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 67714d7ed5b..4c210c2debc 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -18,21 +18,21 @@
#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
-void __cfg80211_scan_done(struct work_struct *wk)
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
{
- struct cfg80211_registered_device *rdev;
struct cfg80211_scan_request *request;
struct net_device *dev;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
- rdev = container_of(wk, struct cfg80211_registered_device,
- scan_done_wk);
+ ASSERT_RDEV_LOCK(rdev);
- mutex_lock(&rdev->mtx);
request = rdev->scan_req;
+ if (!request)
+ return;
+
dev = request->dev;
/*
@@ -43,9 +43,9 @@ void __cfg80211_scan_done(struct work_struct *wk)
cfg80211_sme_scan_done(dev);
if (request->aborted)
- nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
+ nl80211_send_scan_aborted(rdev, dev);
else
- nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
+ nl80211_send_scan_done(rdev, dev);
#ifdef CONFIG_WIRELESS_EXT
if (!request->aborted) {
@@ -57,9 +57,30 @@ void __cfg80211_scan_done(struct work_struct *wk)
dev_put(dev);
+ 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);
- wiphy_to_dev(request->wiphy)->scan_req = NULL;
- kfree(request);
}
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
@@ -120,7 +141,7 @@ void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
dev->bss_generation++;
}
-static u8 *find_ie(u8 num, u8 *ies, size_t len)
+static u8 *find_ie(u8 num, u8 *ies, int len)
{
while (len > 2 && ies[0] != num) {
len -= ies[1] + 2;
@@ -141,7 +162,7 @@ static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
if (!ie1 && !ie2)
return 0;
- if (!ie1)
+ if (!ie1 || !ie2)
return -1;
r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
@@ -194,6 +215,8 @@ static bool is_mesh(struct cfg80211_bss *a,
ie = find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
+ if (!ie)
+ return false;
if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
return false;
@@ -560,6 +583,7 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
spin_lock_bh(&dev->bss_lock);
list_del(&bss->list);
+ dev->bss_generation++;
rb_erase(&bss->rbn, &dev->bss_tree);
spin_unlock_bh(&dev->bss_lock);
@@ -583,6 +607,9 @@ int cfg80211_wext_siwscan(struct net_device *dev,
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))
@@ -595,9 +622,14 @@ int cfg80211_wext_siwscan(struct net_device *dev,
wiphy = &rdev->wiphy;
- for (band = 0; band < IEEE80211_NUM_BANDS; band++)
- if (wiphy->bands[band])
- n_channels += wiphy->bands[band]->n_channels;
+ /* 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 *),
@@ -609,27 +641,46 @@ int cfg80211_wext_siwscan(struct net_device *dev,
creq->wiphy = wiphy;
creq->dev = dev;
- creq->ssids = (void *)(creq + 1);
- creq->channels = (void *)(creq->ssids + 1);
+ /* SSIDs come after channels */
+ creq->ssids = (void *)&creq->channels[n_channels];
creq->n_channels = n_channels;
creq->n_ssids = 1;
- /* all channels */
+ /* 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++) {
+
+ /* 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 = wreq->channel_list[k].m / 100000;
+ 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: ;
}
}
- /* translate scan request */
- if (wrqu->data.length == sizeof(struct iw_scan_req)) {
- wreq = (struct iw_scan_req *)extra;
+ /* Set real number of channels specified in creq->channels[] */
+ creq->n_channels = i;
+ /* translate "Scan for SSID" request */
+ if (wreq) {
if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-14 00:01:40 +0000