From: Johannes Berg <johannes.berg@xxxxxxxxx>
Add the signal strength (in dBm only for now) to
frames that are received via nl80211's various
frame APIs.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/linux/nl80211.h | 6 ++++++
include/net/cfg80211.h | 8 +++++---
net/mac80211/rx.c | 13 +++++++++++--
net/wireless/mlme.c | 7 ++++---
net/wireless/nl80211.c | 9 +++++++--
net/wireless/nl80211.h | 3 ++-
6 files changed, 35 insertions(+), 11 deletions(-)
--- a/include/linux/nl80211.h 2012-03-02 13:27:36.000000000 +0100
+++ b/include/linux/nl80211.h 2012-03-02 13:31:24.000000000 +0100
@@ -1197,6 +1197,10 @@ enum nl80211_commands {
* @NL80211_ATTR_NOACK_MAP: This u16 bitmap contains the No Ack Policy of
* up to 16 TIDs.
*
+ * @NL80211_ATTR_RX_SIGNAL_DBM: signal strength in dBm (as a 32-bit int);
+ * this attribute is (depending on the driver capabilities) added to
+ * received frames indicated with %NL80211_CMD_FRAME.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1442,6 +1446,8 @@ enum nl80211_attrs {
NL80211_ATTR_NOACK_MAP,
+ NL80211_ATTR_RX_SIGNAL_DBM,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
--- a/include/net/cfg80211.h 2012-03-02 13:28:11.000000000 +0100
+++ b/include/net/cfg80211.h 2012-03-02 13:33:02.000000000 +0100
@@ -3186,6 +3186,7 @@ void cfg80211_del_sta(struct net_device
* cfg80211_rx_mgmt - notification of received, unprocessed management frame
* @dev: network device
* @freq: Frequency on which the frame was received in MHz
+ * @sig_dbm: signal strength in mBm, or 0 if unknown
* @buf: Management frame (header + body)
* @len: length of the frame data
* @gfp: context flags
@@ -3198,8 +3199,8 @@ void cfg80211_del_sta(struct net_device
* This function is called whenever an Action frame is received for a station
* mode interface, but is not processed in kernel.
*/
-bool cfg80211_rx_mgmt(struct net_device *dev, int freq, const u8 *buf,
- size_t len, gfp_t gfp);
+bool cfg80211_rx_mgmt(struct net_device *dev, int freq, int sig_dbm,
+ const u8 *buf, size_t len, gfp_t gfp);
/**
* cfg80211_mgmt_tx_status - notification of TX status for management frame
@@ -3312,6 +3313,7 @@ void cfg80211_probe_status(struct net_de
* @frame: the frame
* @len: length of the frame
* @freq: frequency the frame was received on
+ * @sig_dbm: signal strength in mBm, or 0 if unknown
* @gfp: allocation flags
*
* Use this function to report to userspace when a beacon was
@@ -3320,7 +3322,7 @@ void cfg80211_probe_status(struct net_de
*/
void cfg80211_report_obss_beacon(struct wiphy *wiphy,
const u8 *frame, size_t len,
- int freq, gfp_t gfp);
+ int freq, int sig_dbm, gfp_t gfp);
/*
* cfg80211_can_beacon_sec_chan - test if ht40 on extension channel can be used
--- a/net/wireless/nl80211.c 2012-03-02 13:27:36.000000000 +0100
+++ b/net/wireless/nl80211.c 2012-03-02 13:32:44.000000000 +0100
@@ -7673,7 +7673,8 @@ bool nl80211_unexpected_4addr_frame(stru
int nl80211_send_mgmt(struct cfg80211_registered_device *rdev,
struct net_device *netdev, u32 nlpid,
- int freq, const u8 *buf, size_t len, gfp_t gfp)
+ int freq, int sig_dbm,
+ const u8 *buf, size_t len, gfp_t gfp)
{
struct sk_buff *msg;
void *hdr;
@@ -7691,6 +7692,8 @@ int nl80211_send_mgmt(struct cfg80211_re
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+ if (sig_dbm)
+ NLA_PUT_U32(msg, NL80211_ATTR_RX_SIGNAL_DBM, sig_dbm);
NLA_PUT(msg, NL80211_ATTR_FRAME, len, buf);
genlmsg_end(msg, hdr);
@@ -7952,7 +7955,7 @@ EXPORT_SYMBOL(cfg80211_probe_status);
void cfg80211_report_obss_beacon(struct wiphy *wiphy,
const u8 *frame, size_t len,
- int freq, gfp_t gfp)
+ int freq, int sig_dbm, gfp_t gfp)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
struct sk_buff *msg;
@@ -7975,6 +7978,8 @@ void cfg80211_report_obss_beacon(struct
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
if (freq)
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+ if (sig_dbm)
+ NLA_PUT_U32(msg, NL80211_ATTR_RX_SIGNAL_DBM, sig_dbm);
NLA_PUT(msg, NL80211_ATTR_FRAME, len, frame);
genlmsg_end(msg, hdr);
--- a/net/wireless/mlme.c 2012-03-02 13:28:10.000000000 +0100
+++ b/net/wireless/mlme.c 2012-03-02 13:28:13.000000000 +0100
@@ -814,8 +814,8 @@ int cfg80211_mlme_mgmt_tx(struct cfg8021
cookie);
}
-bool cfg80211_rx_mgmt(struct net_device *dev, int freq, const u8 *buf,
- size_t len, gfp_t gfp)
+bool cfg80211_rx_mgmt(struct net_device *dev, int freq, int sig_mbm,
+ const u8 *buf, size_t len, gfp_t gfp)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct wiphy *wiphy = wdev->wiphy;
@@ -854,7 +854,8 @@ bool cfg80211_rx_mgmt(struct net_device
/* found match! */
/* Indicate the received Action frame to user space */
- if (nl80211_send_mgmt(rdev, dev, reg->nlpid, freq,
+ if (nl80211_send_mgmt(rdev, dev, reg->nlpid,
+ freq, sig_mbm,
buf, len, gfp))
continue;
--- a/net/mac80211/rx.c 2012-03-02 13:28:12.000000000 +0100
+++ b/net/mac80211/rx.c 2012-03-02 13:30:48.000000000 +0100
@@ -2182,9 +2182,14 @@ ieee80211_rx_h_mgmt_check(struct ieee802
if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
ieee80211_is_beacon(mgmt->frame_control) &&
!(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
+ int sig = 0;
+
+ if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
+ sig = status->signal;
+
cfg80211_report_obss_beacon(rx->local->hw.wiphy,
rx->skb->data, rx->skb->len,
- status->freq, GFP_ATOMIC);
+ status->freq, sig, GFP_ATOMIC);
rx->flags |= IEEE80211_RX_BEACON_REPORTED;
}
@@ -2408,6 +2413,7 @@ static ieee80211_rx_result debug_noinlin
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
{
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+ int sig = 0;
/* skip known-bad action frames and return them in the next handler */
if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
@@ -2420,7 +2426,10 @@ ieee80211_rx_h_userspace_mgmt(struct iee
* it transmitted were processed or returned.
*/
- if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq,
+ if (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
+ sig = status->signal;
+
+ if (cfg80211_rx_mgmt(rx->sdata->dev, status->freq, sig,
rx->skb->data, rx->skb->len,
GFP_ATOMIC)) {
if (rx->sta)
--- a/net/wireless/nl80211.h 2012-02-23 17:03:23.000000000 +0100
+++ b/net/wireless/nl80211.h 2012-03-02 13:32:01.000000000 +0100
@@ -92,7 +92,8 @@ void nl80211_send_sta_del_event(struct c
gfp_t gfp);
int nl80211_send_mgmt(struct cfg80211_registered_device *rdev,
- struct net_device *netdev, u32 nlpid, int freq,
+ struct net_device *netdev, u32 nlpid,
+ int freq, int sig_dbm,
const u8 *buf, size_t len, gfp_t gfp);
void nl80211_send_mgmt_tx_status(struct cfg80211_registered_device *rdev,
struct net_device *netdev, u64 cookie,
--
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