This patch introduces a new attribute for a wiphy that tells
userspace how long the information elements added to a probe
request frame can be at most. It also updates the at76 to
advertise that it cannot support that, and, for now until I
can fix that, iwlwifi too.
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/at76c50x-usb.c | 1 +
drivers/net/wireless/iwlwifi/iwl-core.c | 1 +
include/linux/nl80211.h | 4 ++++
include/net/wireless.h | 1 +
net/mac80211/main.c | 13 ++++++++++++-
net/mac80211/util.c | 2 ++
net/wireless/nl80211.c | 7 +++++++
7 files changed, 28 insertions(+), 1 deletion(-)
--- wireless-testing.orig/include/net/wireless.h 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/include/net/wireless.h 2009-03-26 17:12:29.000000000 +0100
@@ -222,6 +222,7 @@ struct wiphy {
int bss_priv_size;
u8 max_scan_ssids;
+ u16 max_scan_ie_len;
/* If multiple wiphys are registered and you're handed e.g.
* a regular netdev with assigned ieee80211_ptr, you won't
--- wireless-testing.orig/net/wireless/nl80211.c 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/net/wireless/nl80211.c 2009-03-26 17:12:29.000000000 +0100
@@ -151,6 +151,8 @@ static int nl80211_send_wiphy(struct sk_
NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
dev->wiphy.max_scan_ssids);
+ NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
+ dev->wiphy.max_scan_ie_len);
nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
if (!nl_modes)
@@ -2492,6 +2494,11 @@ static int nl80211_trigger_scan(struct s
else
ie_len = 0;
+ if (ie_len > wiphy->max_scan_ie_len) {
+ err = -EINVAL;
+ goto out;
+ }
+
request = kzalloc(sizeof(*request)
+ sizeof(*ssid) * n_ssids
+ sizeof(channel) * n_channels
--- wireless-testing.orig/include/linux/nl80211.h 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/include/linux/nl80211.h 2009-03-26 17:12:29.000000000 +0100
@@ -380,6 +380,8 @@ enum nl80211_commands {
*
* @NL80211_ATTR_MAX_NUM_SCAN_SSIDS: number of SSIDs you can scan with
* a single scan request, a wiphy attribute.
+ * @NL80211_ATTR_MAX_SCAN_IE_LEN: maximum length of information elements
+ * that can be added to a scan request
*
* @NL80211_ATTR_SCAN_FREQUENCIES: nested attribute with frequencies (in MHz)
* @NL80211_ATTR_SCAN_SSIDS: nested attribute with SSIDs, leave out for passive
@@ -492,6 +494,8 @@ enum nl80211_attrs {
NL80211_ATTR_AUTH_TYPE,
NL80211_ATTR_REASON_CODE,
+ NL80211_ATTR_MAX_SCAN_IE_LEN,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
--- wireless-testing.orig/net/mac80211/main.c 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/net/mac80211/main.c 2009-03-26 17:14:35.000000000 +0100
@@ -724,7 +724,18 @@ struct ieee80211_hw *ieee80211_alloc_hw(
return NULL;
wiphy->privid = mac80211_wiphy_privid;
- wiphy->max_scan_ssids = 4;
+
+ 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 */;
+
+ }
+
/* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
sizeof(struct cfg80211_bss);
--- wireless-testing.orig/net/mac80211/util.c 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/net/mac80211/util.c 2009-03-26 17:12:29.000000000 +0100
@@ -891,6 +891,8 @@ void ieee80211_send_probe_req(struct iee
*pos = rate->bitrate / 5;
}
+ /* if adding more here, adjust max_scan_ie_len */
+
if (ie)
memcpy(skb_put(skb, ie_len), ie, ie_len);
--- wireless-testing.orig/drivers/net/wireless/at76c50x-usb.c 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/drivers/net/wireless/at76c50x-usb.c 2009-03-26 17:12:29.000000000 +0100
@@ -2248,6 +2248,7 @@ static int at76_init_new_device(struct a
/* mac80211 initialisation */
priv->hw->wiphy->max_scan_ssids = 1;
+ priv->hw->wiphy->max_scan_ie_len = 0;
priv->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &at76_supported_band;
priv->hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
--- wireless-testing.orig/drivers/net/wireless/iwlwifi/iwl-core.c 2009-03-26 17:12:27.000000000 +0100
+++ wireless-testing/drivers/net/wireless/iwlwifi/iwl-core.c 2009-03-26 17:12:29.000000000 +0100
@@ -1306,6 +1306,7 @@ int iwl_setup_mac(struct iwl_priv *priv)
hw->wiphy->custom_regulatory = true;
hw->wiphy->max_scan_ssids = 1;
+ hw->wiphy->max_scan_ie_len = 0; /* XXX for now */
/* Default value; 4 EDCA QOS priorities */
hw->queues = 4;
--
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