Instead of just passing the cfg80211-requested IEs, pass
the locally generated ones as well.
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
v2: * assume wiphy->max_scan_ie_len contains the limit *including*
the IEs mac80211 passes (since the driver cannot know how long
those will be) and adjust the driver's limit accordingly
* keep track of original IEs and hand back the pristine cfg80211
request structure
* mark the IE pointer const in the request struct
include/net/cfg80211.h | 2 -
include/net/mac80211.h | 13 ++++---
net/mac80211/ieee80211_i.h | 12 +++++--
net/mac80211/main.c | 16 +++++----
net/mac80211/scan.c | 23 +++++++++++++
net/mac80211/util.c | 76 ++++++++++++++++++++++++++-------------------
net/wireless/nl80211.c | 3 +
7 files changed, 98 insertions(+), 47 deletions(-)
--- wireless-testing.orig/include/net/mac80211.h 2009-03-27 09:36:05.000000000 +0100
+++ wireless-testing/include/net/mac80211.h 2009-03-27 12:06:23.000000000 +0100
@@ -1330,11 +1330,14 @@ enum ieee80211_ampdu_mlme_action {
* the scan state machine in stack. The scan must honour the channel
* configuration done by the regulatory agent in the wiphy's
* registered bands. The hardware (or the driver) needs to make sure
- * that power save is disabled. When the scan finishes,
- * ieee80211_scan_completed() must be called; note that it also must
- * be called when the scan cannot finish because the hardware is
- * turned off! Anything else is a bug! Returns a negative error code
- * which will be seen in userspace.
+ * that power save is disabled.
+ * The @req ie/ie_len members are rewritten by mac80211 to contain the
+ * entire IEs after the SSID, so that drivers need not look at these
+ * at all but just send them after the SSID -- mac80211 includes the
+ * (extended) supported rates and HT information (where applicable).
+ * When the scan finishes, ieee80211_scan_completed() must be called;
+ * note that it also must be called when the scan cannot finish due to
+ * any error unless this callback returned a negative error code.
*
* @sw_scan_start: Notifier function that is called just before a software scan
* is started. Can be NULL, if the driver doesn't need this notification.
--- wireless-testing.orig/net/mac80211/ieee80211_i.h 2009-03-27 09:36:05.000000000 +0100
+++ wireless-testing/net/mac80211/ieee80211_i.h 2009-03-27 12:16:40.000000000 +0100
@@ -51,6 +51,10 @@ struct ieee80211_local;
* increased memory use (about 2 kB of RAM per entry). */
#define IEEE80211_FRAGMENT_MAX 4
+/* cfg80211 only supports 32 rates */
+#define MAC80211_PREQ_IE_LEN ( 2 + 32 /* SSID */\
+ + 4 + 32 /* (ext) supp rates */)
+
/*
* Time after which we ignore scan results and no longer report/use
* them in any way.
@@ -671,6 +675,8 @@ struct ieee80211_local {
struct cfg80211_scan_request int_scan_req;
struct cfg80211_scan_request *scan_req;
struct ieee80211_channel *scan_channel;
+ const u8 *orig_ies;
+ int orig_ies_len;
int scan_channel_idx;
enum { SCAN_SET_CHANNEL, SCAN_SEND_PROBE } scan_state;
@@ -1093,9 +1099,11 @@ void ieee80211_send_auth(struct ieee8021
u16 transaction, u16 auth_alg,
u8 *extra, size_t extra_len,
const u8 *bssid, int encrypt);
+int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
+ const u8 *ie, size_t ie_len);
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
- u8 *ssid, size_t ssid_len,
- u8 *ie, size_t ie_len);
+ const u8 *ssid, size_t ssid_len,
+ const u8 *ie, size_t ie_len);
void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
const size_t supp_rates_len,
--- wireless-testing.orig/net/mac80211/util.c 2009-03-27 12:06:19.000000000 +0100
+++ wireless-testing/net/mac80211/util.c 2009-03-27 12:17:19.000000000 +0100
@@ -832,16 +832,54 @@ void ieee80211_send_auth(struct ieee8021
ieee80211_tx_skb(sdata, skb, encrypt);
}
+int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
+ const u8 *ie, size_t ie_len)
+{
+ struct ieee80211_supported_band *sband;
+ u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
+ int i;
+
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+
+ pos = buffer;
+
+ *pos++ = WLAN_EID_SUPP_RATES;
+ supp_rates_len = pos;
+ *pos++ = 0;
+
+ for (i = 0; i < sband->n_bitrates; i++) {
+ struct ieee80211_rate *rate = &sband->bitrates[i];
+
+ if (esupp_rates_len) {
+ *esupp_rates_len += 1;
+ } else if (*supp_rates_len == 8) {
+ *pos++ = WLAN_EID_EXT_SUPP_RATES;
+ esupp_rates_len = pos;
+ *pos++ = 1;
+ } else
+ *supp_rates_len += 1;
+
+ *pos++ = rate->bitrate / 5;
+ }
+
+ /* if adding more here, adjust MAC80211_PREQ_IE_LEN */
+
+ if (ie) {
+ memcpy(pos, ie, ie_len);
+ pos += ie_len;
+ }
+
+ return pos - buffer;
+}
+
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
- u8 *ssid, size_t ssid_len,
- u8 *ie, size_t ie_len)
+ const u8 *ssid, size_t ssid_len,
+ const u8 *ie, size_t ie_len)
{
struct ieee80211_local *local = sdata->local;
- struct ieee80211_supported_band *sband;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
- u8 *pos, *supp_rates, *esupp_rates = NULL;
- int i;
+ u8 *pos;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
ie_len);
@@ -868,33 +906,9 @@ void ieee80211_send_probe_req(struct iee
*pos++ = WLAN_EID_SSID;
*pos++ = ssid_len;
memcpy(pos, ssid, ssid_len);
+ pos += ssid_len;
- supp_rates = skb_put(skb, 2);
- supp_rates[0] = WLAN_EID_SUPP_RATES;
- supp_rates[1] = 0;
- sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
-
- for (i = 0; i < sband->n_bitrates; i++) {
- struct ieee80211_rate *rate = &sband->bitrates[i];
- if (esupp_rates) {
- pos = skb_put(skb, 1);
- esupp_rates[1]++;
- } else if (supp_rates[1] == 8) {
- esupp_rates = skb_put(skb, 3);
- esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
- esupp_rates[1] = 1;
- pos = &esupp_rates[2];
- } else {
- pos = skb_put(skb, 1);
- supp_rates[1]++;
- }
- *pos = rate->bitrate / 5;
- }
-
- /* if adding more here, adjust max_scan_ie_len */
-
- if (ie)
- memcpy(skb_put(skb, ie_len), ie, ie_len);
+ skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
ieee80211_tx_skb(sdata, skb, 0);
}
--- wireless-testing.orig/net/mac80211/main.c 2009-03-27 12:06:19.000000000 +0100
+++ wireless-testing/net/mac80211/main.c 2009-03-27 12:09:04.000000000 +0100
@@ -728,13 +728,17 @@ struct ieee80211_hw *ieee80211_alloc_hw(
if (!ops->hw_scan) {
/* For hw_scan, driver needs to set these up. */
wiphy->max_scan_ssids = 4;
-
- /* we support a maximum of 32 rates in cfg80211 */
- wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN
- - 2 - 32 /* SSID */
- - 4 - 32 /* (ext) supp rates */;
-
+ wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
}
+ /*
+ * If the driver supports any scan IEs, then assume the
+ * limit includes the IEs mac80211 will add, otherwise
+ * leave it at zero and let the driver sort it out; we
+ * still pass our IEs to the driver but userspace will
+ * not be allowed to in that case.
+ */
+ if (wiphy->max_scan_ie_len)
+ wiphy->max_scan_ie_len -= MAC80211_PREQ_IE_LEN;
/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
--- wireless-testing.orig/net/mac80211/scan.c 2009-03-27 09:36:05.000000000 +0100
+++ wireless-testing/net/mac80211/scan.c 2009-03-27 12:12:49.000000000 +0100
@@ -286,6 +286,12 @@ void ieee80211_scan_completed(struct iee
if (WARN_ON(!local->scan_req))
return;
+ if (local->hw_scanning) {
+ kfree(local->scan_req->ie);
+ local->scan_req->ie = local->orig_ies;
+ local->scan_req->ie_len = local->orig_ies_len;
+ }
+
if (local->scan_req != &local->int_scan_req)
cfg80211_scan_done(local->scan_req, aborted);
local->scan_req = NULL;
@@ -456,12 +462,27 @@ int ieee80211_start_scan(struct ieee8021
}
if (local->ops->hw_scan) {
- int rc;
+ u8 *ies;
+ int rc, ielen;
+
+ ies = kmalloc(MAC80211_PREQ_IE_LEN + req->ie_len, GFP_KERNEL);
+ if (!ies)
+ return -ENOMEM;
+
+ ielen = ieee80211_build_preq_ies(local, ies,
+ req->ie, req->ie_len);
+ local->orig_ies = req->ie;
+ local->orig_ies_len = req->ie_len;
+ req->ie = ies;
+ req->ie_len = ielen;
local->hw_scanning = true;
rc = drv_hw_scan(local, req);
if (rc) {
local->hw_scanning = false;
+ kfree(ies);
+ req->ie_len = local->orig_ies_len;
+ req->ie = local->orig_ies;
return rc;
}
local->scan_sdata = scan_sdata;
--- wireless-testing.orig/include/net/cfg80211.h 2009-03-27 12:13:48.000000000 +0100
+++ wireless-testing/include/net/cfg80211.h 2009-03-27 12:14:09.000000000 +0100
@@ -504,7 +504,7 @@ struct cfg80211_scan_request {
int n_ssids;
struct ieee80211_channel **channels;
u32 n_channels;
- u8 *ie;
+ const u8 *ie;
size_t ie_len;
/* internal */
--- wireless-testing.orig/net/wireless/nl80211.c 2009-03-27 12:14:28.000000000 +0100
+++ wireless-testing/net/wireless/nl80211.c 2009-03-27 12:14:56.000000000 +0100
@@ -2561,7 +2561,8 @@ static int nl80211_trigger_scan(struct s
if (info->attrs[NL80211_ATTR_IE]) {
request->ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
- memcpy(request->ie, nla_data(info->attrs[NL80211_ATTR_IE]),
+ memcpy((void *)request->ie,
+ nla_data(info->attrs[NL80211_ATTR_IE]),
request->ie_len);
}
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