cfg80211: allow wiphy specific regdomain management
Add a new regulatory flag that allows a driver to manage regdomain
changes/updates for its own wiphy.
A self-managed wiphys only employs regulatory information obtained from
the FW and driver and does not use other cfg80211 sources like
beacon-hints, country-code IEs and hints from other devices on the same
system. Conversely, a self-managed wiphy does not share its regulatory
hints with other devices in the system. If a system contains several
devices, one or more of which are self-managed, there might be
contradictory regulatory settings between them. Usage of flag is
generally discouraged. Only use it if the FW/driver is incompatible
with non-locally originated hints.
A new API lets the driver send a complete regdomain, to be applied on
its wiphy only.
After a wiphy-specific regdomain change takes place, usermode will get
a new type of change notification. The regulatory core also takes care
enforce regulatory restrictions, in case some interfaces are on
forbidden channels.
Signed-off-by: Jonathan Doron <jonathanx.doron@intel.com>
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Reviewed-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 4ebb816..4bc1fc9 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3808,6 +3808,20 @@
int regulatory_hint(struct wiphy *wiphy, const char *alpha2);
/**
+ * regulatory_set_wiphy_regd - set regdom info for self managed drivers
+ * @wiphy: the wireless device we want to process the regulatory domain on
+ * @rd: the regulatory domain informatoin to use for this wiphy
+ *
+ * Set the regulatory domain information for self-managed wiphys, only they
+ * may use this function. See %REGULATORY_WIPHY_SELF_MANAGED for more
+ * information.
+ *
+ * Return: 0 on success. -EINVAL, -EPERM
+ */
+int regulatory_set_wiphy_regd(struct wiphy *wiphy,
+ struct ieee80211_regdomain *rd);
+
+/**
* wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
* @wiphy: the wireless device we want to process the regulatory domain on
* @regd: the custom regulatory domain to use for this wiphy
diff --git a/include/net/regulatory.h b/include/net/regulatory.h
index b776d72..ebc5a2e 100644
--- a/include/net/regulatory.h
+++ b/include/net/regulatory.h
@@ -147,6 +147,24 @@
* NL80211_IFTYPE_P2P_CLIENT, NL80211_IFTYPE_P2P_GO,
* NL80211_IFTYPE_P2P_DEVICE. The flag will be set by default if a device
* includes any modes unsupported for enforcement checking.
+ * @REGULATORY_WIPHY_SELF_MANAGED: for devices that employ wiphy-specific
+ * regdom management. These devices will ignore all regdom changes not
+ * originating from their own wiphy.
+ * A self-managed wiphys only employs regulatory information obtained from
+ * the FW and driver and does not use other cfg80211 sources like
+ * beacon-hints, country-code IEs and hints from other devices on the same
+ * system. Conversely, a self-managed wiphy does not share its regulatory
+ * hints with other devices in the system. If a system contains several
+ * devices, one or more of which are self-managed, there might be
+ * contradictory regulatory settings between them. Usage of flag is
+ * generally discouraged. Only use it if the FW/driver is incompatible
+ * with non-locally originated hints.
+ * This flag is incompatible with the flags: %REGULATORY_CUSTOM_REG,
+ * %REGULATORY_STRICT_REG, %REGULATORY_COUNTRY_IE_FOLLOW_POWER,
+ * %REGULATORY_COUNTRY_IE_IGNORE and %REGULATORY_DISABLE_BEACON_HINTS.
+ * Mixing any of the above flags with this flag will result in a failure
+ * to register the wiphy. This flag implies
+ * %REGULATORY_DISABLE_BEACON_HINTS and %REGULATORY_COUNTRY_IE_IGNORE.
*/
enum ieee80211_regulatory_flags {
REGULATORY_CUSTOM_REG = BIT(0),
@@ -156,6 +174,7 @@
REGULATORY_COUNTRY_IE_IGNORE = BIT(4),
REGULATORY_ENABLE_RELAX_NO_IR = BIT(5),
REGULATORY_IGNORE_STALE_KICKOFF = BIT(6),
+ REGULATORY_WIPHY_SELF_MANAGED = BIT(7),
};
struct ieee80211_freq_range {
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 2d384d0..fb58e65 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -782,6 +782,10 @@
* peer given by %NL80211_ATTR_MAC. Both peers must be on the base channel
* when this command completes.
*
+ * @NL80211_CMD_WIPHY_REG_CHANGE: Similar to %NL80211_CMD_REG_CHANGE, but used
+ * as an event to indicate changes for devices with wiphy-specific regdom
+ * management.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -966,6 +970,8 @@
NL80211_CMD_TDLS_CHANNEL_SWITCH,
NL80211_CMD_TDLS_CANCEL_CHANNEL_SWITCH,
+ NL80211_CMD_WIPHY_REG_CHANGE,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 4910758..b661fcc 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -561,6 +561,14 @@
BIT(NL80211_IFTYPE_MONITOR)))
wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
+ if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
+ (wiphy->regulatory_flags &
+ (REGULATORY_CUSTOM_REG |
+ REGULATORY_STRICT_REG |
+ REGULATORY_COUNTRY_IE_FOLLOW_POWER |
+ REGULATORY_COUNTRY_IE_IGNORE))))
+ return -EINVAL;
+
if (WARN_ON(wiphy->coalesce &&
(!wiphy->coalesce->n_rules ||
!wiphy->coalesce->n_patterns) &&
diff --git a/net/wireless/core.h b/net/wireless/core.h
index faa5b16..e87cae5 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -36,6 +36,13 @@
* the country on the country IE changed. */
char country_ie_alpha2[2];
+ /*
+ * the driver requests the regulatory core to set this regulatory
+ * domain as the wiphy's. Only used for %REGULATORY_WIPHY_SELF_MANAGED
+ * devices using the regulatory_set_wiphy_regd() API
+ */
+ const struct ieee80211_regdomain *requested_regd;
+
/* If a Country IE has been received this tells us the environment
* which its telling us its in. This defaults to ENVIRON_ANY */
enum environment_cap env;
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2d5dc42..eebb7e4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -11042,25 +11042,9 @@
NL80211_MCGRP_SCAN, GFP_KERNEL);
}
-/*
- * This can happen on global regulatory changes or device specific settings
- * based on custom world regulatory domains.
- */
-void nl80211_send_reg_change_event(struct regulatory_request *request)
+static bool nl80211_reg_change_event_fill(struct sk_buff *msg,
+ struct regulatory_request *request)
{
- struct sk_buff *msg;
- void *hdr;
-
- msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (!msg)
- return;
-
- hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_REG_CHANGE);
- if (!hdr) {
- nlmsg_free(msg);
- return;
- }
-
/* Userspace can always count this one always being set */
if (nla_put_u8(msg, NL80211_ATTR_REG_INITIATOR, request->initiator))
goto nla_put_failure;
@@ -11094,6 +11078,35 @@
goto nla_put_failure;
}
+ return true;
+
+nla_put_failure:
+ return false;
+}
+
+/*
+ * This can happen on global regulatory changes or device specific settings
+ * based on custom regulatory domains.
+ */
+void nl80211_common_reg_change_event(enum nl80211_commands cmd_id,
+ struct regulatory_request *request)
+{
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return;
+
+ hdr = nl80211hdr_put(msg, 0, 0, 0, cmd_id);
+ if (!hdr) {
+ nlmsg_free(msg);
+ return;
+ }
+
+ if (nl80211_reg_change_event_fill(msg, request) == false)
+ goto nla_put_failure;
+
genlmsg_end(msg, hdr);
rcu_read_lock();
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 7ad70d6..84d4edf 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -17,7 +17,21 @@
struct net_device *netdev, u32 cmd);
void nl80211_send_sched_scan_results(struct cfg80211_registered_device *rdev,
struct net_device *netdev);
-void nl80211_send_reg_change_event(struct regulatory_request *request);
+void nl80211_common_reg_change_event(enum nl80211_commands cmd_id,
+ struct regulatory_request *request);
+
+static inline void
+nl80211_send_reg_change_event(struct regulatory_request *request)
+{
+ nl80211_common_reg_change_event(NL80211_CMD_REG_CHANGE, request);
+}
+
+static inline void
+nl80211_send_wiphy_reg_change_event(struct regulatory_request *request)
+{
+ nl80211_common_reg_change_event(NL80211_CMD_WIPHY_REG_CHANGE, request);
+}
+
void nl80211_send_rx_auth(struct cfg80211_registered_device *rdev,
struct net_device *netdev,
const u8 *buf, size_t len, gfp_t gfp);
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2d97600..c040f8a 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1307,6 +1307,9 @@
{
struct regulatory_request *lr = get_last_request();
+ if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+ return true;
+
if (!lr) {
REG_DBG_PRINT("Ignoring regulatory request set by %s "
"since last_request is not set\n",
@@ -2147,11 +2150,52 @@
spin_unlock_bh(®_pending_beacons_lock);
}
+static void reg_process_self_managed_hints(void)
+{
+ struct cfg80211_registered_device *rdev;
+ struct wiphy *wiphy;
+ const struct ieee80211_regdomain *tmp;
+ const struct ieee80211_regdomain *regd;
+ enum ieee80211_band band;
+ struct regulatory_request request = {};
+
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ wiphy = &rdev->wiphy;
+
+ spin_lock(®_requests_lock);
+ regd = rdev->requested_regd;
+ rdev->requested_regd = NULL;
+ spin_unlock(®_requests_lock);
+
+ if (regd == NULL)
+ continue;
+
+ tmp = get_wiphy_regdom(wiphy);
+ rcu_assign_pointer(wiphy->regd, regd);
+ rcu_free_regdom(tmp);
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++)
+ handle_band_custom(wiphy, wiphy->bands[band], regd);
+
+ reg_process_ht_flags(wiphy);
+
+ request.wiphy_idx = get_wiphy_idx(wiphy);
+ request.alpha2[0] = regd->alpha2[0];
+ request.alpha2[1] = regd->alpha2[1];
+ request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
+
+ nl80211_send_wiphy_reg_change_event(&request);
+ }
+
+ reg_check_channels();
+}
+
static void reg_todo(struct work_struct *work)
{
rtnl_lock();
reg_process_pending_hints();
reg_process_pending_beacon_hints();
+ reg_process_self_managed_hints();
rtnl_unlock();
}
@@ -2432,6 +2476,8 @@
world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+ continue;
if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
restore_custom_reg_settings(&rdev->wiphy);
}
@@ -2835,10 +2881,52 @@
return 0;
}
+int regulatory_set_wiphy_regd(struct wiphy *wiphy,
+ struct ieee80211_regdomain *rd)
+{
+ const struct ieee80211_regdomain *regd;
+ const struct ieee80211_regdomain *prev_regd;
+ struct cfg80211_registered_device *rdev;
+
+ if (WARN_ON(!wiphy || !rd))
+ return -EINVAL;
+
+ if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
+ "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
+ return -EPERM;
+
+ if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
+ print_regdomain_info(rd);
+ return -EINVAL;
+ }
+
+ regd = reg_copy_regd(rd);
+ if (IS_ERR(regd))
+ return PTR_ERR(regd);
+
+ rdev = wiphy_to_rdev(wiphy);
+
+ spin_lock(®_requests_lock);
+ prev_regd = rdev->requested_regd;
+ rdev->requested_regd = regd;
+ spin_unlock(®_requests_lock);
+
+ kfree(prev_regd);
+
+ schedule_work(®_work);
+ return 0;
+}
+EXPORT_SYMBOL(regulatory_set_wiphy_regd);
+
void wiphy_regulatory_register(struct wiphy *wiphy)
{
struct regulatory_request *lr;
+ /* self-managed devices ignore external hints */
+ if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+ wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
+ REGULATORY_COUNTRY_IE_IGNORE;
+
if (!reg_dev_ignore_cell_hint(wiphy))
reg_num_devs_support_basehint++;