cfg80211: use RTNL locked reg_can_beacon for IR-relaxation

The RTNL is required to check for IR-relaxation conditions that allow
more channels to beacon. Export an RTNL locked version of reg_can_beacon
and use it where possible in AP/STA interface type flows, where
IR-relaxation may be applicable.

Fixes: 06f207fc5418 ("cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA")
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index a741678..883fe1e 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4868,6 +4868,23 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
                             struct cfg80211_chan_def *chandef,
                             enum nl80211_iftype iftype);
 
+/**
+ * cfg80211_reg_can_beacon_relax - check if beaconing is allowed with relaxation
+ * @wiphy: the wiphy
+ * @chandef: the channel definition
+ * @iftype: interface type
+ *
+ * Return: %true if there is no secondary channel or the secondary channel(s)
+ * can be used for beaconing (i.e. is not a radar channel etc.). This version
+ * also checks if IR-relaxation conditions apply, to allow beaconing under
+ * more permissive conditions.
+ *
+ * Requires the RTNL to be held.
+ */
+bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
+                                  struct cfg80211_chan_def *chandef,
+                                  enum nl80211_iftype iftype);
+
 /*
  * cfg80211_ch_switch_notify - update wdev channel and notify userspace
  * @dev: the device which switched channels

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index ad31b2d..8db6e29 100644 (file)
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -60,6 +60,7 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
        struct ieee80211_channel *ch;
        struct cfg80211_chan_def chandef;
        int i, subband_start;
+       struct wiphy *wiphy = sdata->local->hw.wiphy;
 
        for (i = start; i <= end; i += spacing) {
                if (!ch_cnt)
@@ -70,9 +71,8 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
                        /* we will be active on the channel */
                        cfg80211_chandef_create(&chandef, ch,
                                                NL80211_CHAN_NO_HT);
-                       if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
-                                                   &chandef,
-                                                   sdata->wdev.iftype)) {
+                       if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
+                                                         sdata->wdev.iftype)) {
                                ch_cnt++;
                                /*
                                 * check if the next channel is also part of

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 915b328..59cabc9 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -797,23 +797,18 @@ static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
        return false;
 }
 
-bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
-                            struct cfg80211_chan_def *chandef,
-                            enum nl80211_iftype iftype)
+static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
+                                    struct cfg80211_chan_def *chandef,
+                                    enum nl80211_iftype iftype,
+                                    bool check_no_ir)
 {
        bool res;
        u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
                               IEEE80211_CHAN_RADAR;
 
-       trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype);
+       trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
 
-       /*
-        * Under certain conditions suggested by some regulatory bodies a
-        * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
-        * only if such relaxations are not enabled and the conditions are not
-        * met.
-        */
-       if (!cfg80211_ir_permissive_chan(wiphy, iftype, chandef->chan))
+       if (check_no_ir)
                prohibited_flags |= IEEE80211_CHAN_NO_IR;
 
        if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
@@ -827,8 +822,36 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
        trace_cfg80211_return_bool(res);
        return res;
 }
+
+bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
+                            struct cfg80211_chan_def *chandef,
+                            enum nl80211_iftype iftype)
+{
+       return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
+}
 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
 
+bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
+                                  struct cfg80211_chan_def *chandef,
+                                  enum nl80211_iftype iftype)
+{
+       bool check_no_ir;
+
+       ASSERT_RTNL();
+
+       /*
+        * Under certain conditions suggested by some regulatory bodies a
+        * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
+        * only if such relaxations are not enabled and the conditions are not
+        * met.
+        */
+       check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
+                                                  chandef->chan);
+
+       return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
+}
+EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
+
 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
                                 struct cfg80211_chan_def *chandef)
 {

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index c264eff..76b4157 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2003,7 +2003,8 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
        switch (iftype) {
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
-               if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, iftype)) {
+               if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef,
+                                                  iftype)) {
                        result = -EINVAL;
                        break;
                }
@@ -3403,8 +3404,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
        } else if (!nl80211_get_ap_channel(rdev, &params))
                return -EINVAL;
 
-       if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef,
-                                    wdev->iftype))
+       if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &params.chandef,
+                                          wdev->iftype))
                return -EINVAL;
 
        if (info->attrs[NL80211_ATTR_ACL_POLICY]) {
@@ -6492,8 +6493,8 @@ skip_beacons:
        if (err)
                return err;
 
-       if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef,
-                                    wdev->iftype))
+       if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &params.chandef,
+                                          wdev->iftype))
                return -EINVAL;
 
        err = cfg80211_chandef_dfs_required(wdev->wiphy,
@@ -10170,7 +10171,8 @@ static int nl80211_tdls_channel_switch(struct sk_buff *skb,
                return -EINVAL;
 
        /* we will be active on the TDLS link */
-       if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, wdev->iftype))
+       if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef,
+                                          wdev->iftype))
                return -EINVAL;
 
        /* don't allow switching to DFS channels */

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 29134c8..aa2d754 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1589,7 +1589,7 @@ static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
        case NL80211_IFTYPE_ADHOC:
-               return cfg80211_reg_can_beacon(wiphy, &chandef, iftype);
+               return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_P2P_CLIENT:
                return cfg80211_chandef_usable(wiphy, &chandef,

diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index af3617c..a808279 100644 (file)
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2358,20 +2358,23 @@ TRACE_EVENT(cfg80211_cqm_rssi_notify,
 
 TRACE_EVENT(cfg80211_reg_can_beacon,
        TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef,
-                enum nl80211_iftype iftype),
-       TP_ARGS(wiphy, chandef, iftype),
+                enum nl80211_iftype iftype, bool check_no_ir),
+       TP_ARGS(wiphy, chandef, iftype, check_no_ir),
        TP_STRUCT__entry(
                WIPHY_ENTRY
                CHAN_DEF_ENTRY
                __field(enum nl80211_iftype, iftype)
+               __field(bool, check_no_ir)
        ),
        TP_fast_assign(
                WIPHY_ASSIGN;
                CHAN_DEF_ASSIGN(chandef);
                __entry->iftype = iftype;
+               __entry->check_no_ir = check_no_ir;
        ),
-       TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d",
-                 WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype)
+       TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d check_no_ir=%s",
+                 WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype,
+                 BOOL_TO_STR(__entry->check_no_ir))
 );
 
 TRACE_EVENT(cfg80211_chandef_dfs_required,