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-rw-r--r--include/net/cfg80211.h2
-rw-r--r--include/uapi/linux/nl80211.h3
-rw-r--r--net/wireless/core.c12
-rw-r--r--net/wireless/core.h7
-rw-r--r--net/wireless/nl80211.c3
-rw-r--r--net/wireless/util.c41
6 files changed, 60 insertions, 8 deletions
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index f1686d460e6b..970da4420676 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2125,6 +2125,7 @@ struct ieee80211_iface_limit {
* @beacon_int_infra_match: In this combination, the beacon intervals
* between infrastructure and AP types must match. This is required
* only in special cases.
+ * @radar_detect_widths: bitmap of channel widths supported for radar detection
*
* These examples can be expressed as follows:
*
@@ -2177,6 +2178,7 @@ struct ieee80211_iface_combination {
u16 max_interfaces;
u8 n_limits;
bool beacon_int_infra_match;
+ u8 radar_detect_widths;
};
struct mac_address {
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index d01c16220dc5..e6eeb4ba5dc5 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2984,6 +2984,8 @@ enum nl80211_iface_limit_attrs {
* the infrastructure network's beacon interval.
* @NL80211_IFACE_COMB_NUM_CHANNELS: u32 attribute specifying how many
* different channels may be used within this group.
+ * @NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS: u32 attribute containing the bitmap
+ * of supported channel widths for radar detection.
* @NUM_NL80211_IFACE_COMB: number of attributes
* @MAX_NL80211_IFACE_COMB: highest attribute number
*
@@ -3016,6 +3018,7 @@ enum nl80211_if_combination_attrs {
NL80211_IFACE_COMB_MAXNUM,
NL80211_IFACE_COMB_STA_AP_BI_MATCH,
NL80211_IFACE_COMB_NUM_CHANNELS,
+ NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS,
/* keep last */
NUM_NL80211_IFACE_COMB,
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 747dd9365a44..0e702cdc6043 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -382,8 +382,11 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
c = &wiphy->iface_combinations[i];
- /* Combinations with just one interface aren't real */
- if (WARN_ON(c->max_interfaces < 2))
+ /*
+ * Combinations with just one interface aren't real,
+ * however we make an exception for DFS.
+ */
+ if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
return -EINVAL;
/* Need at least one channel */
@@ -398,6 +401,11 @@ static int wiphy_verify_combinations(struct wiphy *wiphy)
CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
return -EINVAL;
+ /* DFS only works on one channel. */
+ if (WARN_ON(c->radar_detect_widths &&
+ (c->num_different_channels > 1)))
+ return -EINVAL;
+
if (WARN_ON(!c->n_limits))
return -EINVAL;
diff --git a/net/wireless/core.h b/net/wireless/core.h
index f342267e3620..8396f7671c8d 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -425,7 +425,8 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan,
- enum cfg80211_chan_mode chanmode);
+ enum cfg80211_chan_mode chanmode,
+ u8 radar_detect);
static inline int
cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
@@ -433,7 +434,7 @@ cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype)
{
return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
- CHAN_MODE_UNDEFINED);
+ CHAN_MODE_UNDEFINED, 0);
}
static inline int
@@ -450,7 +451,7 @@ cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
enum cfg80211_chan_mode chanmode)
{
return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
- chan, chanmode);
+ chan, chanmode, 0);
}
void
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index df82a5c9faee..33de80364c5c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -856,6 +856,9 @@ static int nl80211_put_iface_combinations(struct wiphy *wiphy,
nla_put_u32(msg, NL80211_IFACE_COMB_MAXNUM,
c->max_interfaces))
goto nla_put_failure;
+ if (nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS,
+ c->radar_detect_widths))
+ goto nla_put_failure;
nla_nest_end(msg, nl_combi);
}
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 16d76a807c2f..1c2795d52db0 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1184,7 +1184,8 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan,
- enum cfg80211_chan_mode chanmode)
+ enum cfg80211_chan_mode chanmode,
+ u8 radar_detect)
{
struct wireless_dev *wdev_iter;
u32 used_iftypes = BIT(iftype);
@@ -1195,14 +1196,45 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
enum cfg80211_chan_mode chmode;
int num_different_channels = 0;
int total = 1;
+ bool radar_required;
int i, j;
ASSERT_RTNL();
lockdep_assert_held(&rdev->devlist_mtx);
+ if (WARN_ON(hweight32(radar_detect) > 1))
+ return -EINVAL;
+
+ switch (iftype) {
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_MESH_POINT:
+ case NL80211_IFTYPE_P2P_GO:
+ case NL80211_IFTYPE_WDS:
+ radar_required = !!(chan->flags & IEEE80211_CHAN_RADAR);
+ break;
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_MONITOR:
+ radar_required = false;
+ break;
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NUM_NL80211_IFTYPES:
+ case NL80211_IFTYPE_UNSPECIFIED:
+ default:
+ return -EINVAL;
+ }
+
+ if (radar_required && !radar_detect)
+ return -EINVAL;
+
/* Always allow software iftypes */
- if (rdev->wiphy.software_iftypes & BIT(iftype))
+ if (rdev->wiphy.software_iftypes & BIT(iftype)) {
+ if (radar_detect)
+ return -EINVAL;
return 0;
+ }
memset(num, 0, sizeof(num));
memset(used_channels, 0, sizeof(used_channels));
@@ -1275,7 +1307,7 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
used_iftypes |= BIT(wdev_iter->iftype);
}
- if (total == 1)
+ if (total == 1 && !radar_detect)
return 0;
for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
@@ -1308,6 +1340,9 @@ int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
}
}
+ if (radar_detect && !(c->radar_detect_widths & radar_detect))
+ goto cont;
+
/*
* Finally check that all iftypes that we're currently
* using are actually part of this combination. If they
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-15 23:11:37 +0200