The firmware may decide to switch channels while already beaconing, e.g.
in response to a cfg80211 connect request on a different vif. Add this
event to notify userspace when an AP or GO interface has successfully
migrated to a new channel, so it can update its configuration
accordingly.
Signed-off-by: Thomas Pedersen <c_tpeder@xxxxxxxxxxxxxxxx>
---
v2: update wdev->channel (Johannes)
enforce AP or GO interface type
v3: only support GFP_KERNEL context (Johannes)
include/linux/nl80211.h | 7 +++++++
include/net/cfg80211.h | 11 +++++++++++
net/wireless/mlme.c | 27 +++++++++++++++++++++++++++
net/wireless/nl80211.c | 32 ++++++++++++++++++++++++++++++++
net/wireless/nl80211.h | 4 ++++
5 files changed, 81 insertions(+), 0 deletions(-)
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index e474f6e..49f2bbe 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -548,6 +548,11 @@
* @NL80211_CMD_SET_NOACK_MAP: sets a bitmap for the individual TIDs whether
* No Acknowledgement Policy should be applied.
*
+ * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
+ * independently of the userspace SME, send this event indicating
+ * %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ with
+ * %NL80211_ATTR_WIPHY_CHANNEL_TYPE.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -689,6 +694,8 @@ enum nl80211_commands {
NL80211_CMD_SET_NOACK_MAP,
+ NL80211_CMD_CH_SWITCH_NOTIFY,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 69b7ad3..0f246b6 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3340,6 +3340,17 @@ int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
enum nl80211_channel_type channel_type);
/*
+ * cfg80211_ch_switch_notify - update wdev channel and notify userspace
+ * @dev: the device which switched channels
+ * @freq: new channel frequency (in MHz)
+ * @type: channel type
+ *
+ * Acquires wdev_lock, so must only be called from sleepable driver context!
+ */
+void cfg80211_ch_switch_notify(struct net_device *dev, int freq,
+ enum nl80211_channel_type type);
+
+/*
* cfg80211_calculate_bitrate - calculate actual bitrate (in 100Kbps units)
* @rate: given rate_info to calculate bitrate from
*
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index f5a7ac3..50da120 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -928,6 +928,33 @@ void cfg80211_pmksa_candidate_notify(struct net_device *dev, int index,
}
EXPORT_SYMBOL(cfg80211_pmksa_candidate_notify);
+void cfg80211_ch_switch_notify(struct net_device *dev, int freq,
+ enum nl80211_channel_type type)
+{
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ struct wiphy *wiphy = wdev->wiphy;
+ struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+ struct ieee80211_channel *chan;
+
+ wdev_lock(wdev);
+
+ if (WARN_ON(wdev->iftype != NL80211_IFTYPE_AP &&
+ wdev->iftype != NL80211_IFTYPE_P2P_GO))
+ goto out;
+
+ chan = rdev_freq_to_chan(rdev, freq, type);
+ if (WARN_ON(!chan))
+ goto out;
+
+ wdev->channel = chan;
+
+ nl80211_ch_switch_notify(rdev, dev, freq, type, GFP_KERNEL);
+out:
+ wdev_unlock(wdev);
+ return;
+}
+EXPORT_SYMBOL(cfg80211_ch_switch_notify);
+
bool cfg80211_rx_spurious_frame(struct net_device *dev,
const u8 *addr, gfp_t gfp)
{
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4c1eb94..d5d489f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7890,6 +7890,38 @@ void nl80211_pmksa_candidate_notify(struct cfg80211_registered_device *rdev,
nlmsg_free(msg);
}
+void nl80211_ch_switch_notify(struct cfg80211_registered_device *rdev,
+ struct net_device *netdev, int freq,
+ enum nl80211_channel_type type, gfp_t gfp)
+{
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+ if (!msg)
+ return;
+
+ hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_CH_SWITCH_NOTIFY);
+ if (!hdr) {
+ nlmsg_free(msg);
+ return;
+ }
+
+ NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+ NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+ NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, type);
+
+ genlmsg_end(msg, hdr);
+
+ genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+ nl80211_mlme_mcgrp.id, gfp);
+ return;
+
+ nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ nlmsg_free(msg);
+}
+
void
nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
struct net_device *netdev, const u8 *peer,
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 4ffe50d..01a1122 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -118,6 +118,10 @@ void nl80211_pmksa_candidate_notify(struct cfg80211_registered_device *rdev,
struct net_device *netdev, int index,
const u8 *bssid, bool preauth, gfp_t gfp);
+void nl80211_ch_switch_notify(struct cfg80211_registered_device *rdev,
+ struct net_device *dev, int freq,
+ enum nl80211_channel_type type, gfp_t gfp);
+
bool nl80211_unexpected_frame(struct net_device *dev,
const u8 *addr, gfp_t gfp);
bool nl80211_unexpected_4addr_frame(struct net_device *dev,
--
1.7.4.1
--
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