Return-path: Received: from he.sipsolutions.net ([78.46.109.217]:40625 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756115Ab2CBMkj (ORCPT ); Fri, 2 Mar 2012 07:40:39 -0500 Subject: [PATCH] cfg80211/mac80211: report signal strength for mgmt frames From: Johannes Berg To: John Linville Cc: linux-wireless Content-Type: text/plain; charset="UTF-8" Date: Fri, 02 Mar 2012 13:40:35 +0100 Message-ID: <1330692035.8542.14.camel@jlt3.sipsolutions.net> (sfid-20120302_134042_979335_4F58CEB1) Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Johannes Berg 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 --- 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,