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-rw-r--r--net/wireless/reg.c169
1 files changed, 74 insertions, 95 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 75a406d..f256dff 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -62,6 +62,16 @@ const struct ieee80211_regdomain *cfg80211_regdomain;
*/
static const struct ieee80211_regdomain *country_ie_regdomain;
+/*
+ * Protects static reg.c components:
+ * - cfg80211_world_regdom
+ * - cfg80211_regdom
+ * - country_ie_regdomain
+ * - last_request
+ */
+DEFINE_MUTEX(reg_mutex);
+#define assert_reg_lock() WARN_ON(!mutex_is_locked(&reg_mutex))
+
/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);
static spinlock_t reg_requests_lock;
@@ -113,11 +123,7 @@ static const struct ieee80211_regdomain world_regdom = {
static const struct ieee80211_regdomain *cfg80211_world_regdom =
&world_regdom;
-#ifdef CONFIG_WIRELESS_OLD_REGULATORY
-static char *ieee80211_regdom = "US";
-#else
static char *ieee80211_regdom = "00";
-#endif
module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
@@ -1012,7 +1018,6 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
map_regdom_flags(reg_rule->flags) | bw_flags;
chan->max_antenna_gain = chan->orig_mag =
(int) MBI_TO_DBI(power_rule->max_antenna_gain);
- chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
chan->max_power = chan->orig_mpwr =
(int) MBM_TO_DBM(power_rule->max_eirp);
return;
@@ -1021,7 +1026,6 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
chan->max_antenna_gain = min(chan->orig_mag,
(int) MBI_TO_DBI(power_rule->max_antenna_gain));
- chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
if (chan->orig_mpwr)
chan->max_power = min(chan->orig_mpwr,
(int) MBM_TO_DBM(power_rule->max_eirp));
@@ -1061,10 +1065,10 @@ static bool ignore_reg_update(struct wiphy *wiphy,
static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
{
- struct cfg80211_registered_device *drv;
+ struct cfg80211_registered_device *rdev;
- list_for_each_entry(drv, &cfg80211_drv_list, list)
- wiphy_update_regulatory(&drv->wiphy, initiator);
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+ wiphy_update_regulatory(&rdev->wiphy, initiator);
}
static void handle_reg_beacon(struct wiphy *wiphy,
@@ -1298,7 +1302,7 @@ static void handle_channel_custom(struct wiphy *wiphy,
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
- assert_cfg80211_lock();
+ assert_reg_lock();
sband = wiphy->bands[band];
BUG_ON(chan_idx >= sband->n_channels);
@@ -1323,7 +1327,6 @@ static void handle_channel_custom(struct wiphy *wiphy,
chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
- chan->max_bandwidth = KHZ_TO_MHZ(desired_bw_khz);
chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
}
@@ -1347,14 +1350,14 @@ void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
enum ieee80211_band band;
unsigned int bands_set = 0;
- mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!wiphy->bands[band])
continue;
handle_band_custom(wiphy, band, regd);
bands_set++;
}
- mutex_unlock(&cfg80211_mutex);
+ mutex_unlock(&reg_mutex);
/*
* no point in calling this if it won't have any effect
@@ -1421,7 +1424,7 @@ static int ignore_request(struct wiphy *wiphy,
if (last_wiphy != wiphy) {
/*
* Two cards with two APs claiming different
- * different Country IE alpha2s. We could
+ * Country IE alpha2s. We could
* intersect them, but that seems unlikely
* to be correct. Reject second one for now.
*/
@@ -1500,7 +1503,7 @@ static int ignore_request(struct wiphy *wiphy,
* Returns zero if all went fine, %-EALREADY if a regulatory domain had
* already been set or other standard error codes.
*
- * Caller must hold &cfg80211_mutex
+ * Caller must hold &cfg80211_mutex and &reg_mutex
*/
static int __regulatory_hint(struct wiphy *wiphy,
struct regulatory_request *pending_request)
@@ -1575,6 +1578,7 @@ static void reg_process_hint(struct regulatory_request *reg_request)
BUG_ON(!reg_request->alpha2);
mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
if (wiphy_idx_valid(reg_request->wiphy_idx))
wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
@@ -1590,6 +1594,7 @@ static void reg_process_hint(struct regulatory_request *reg_request)
if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
wiphy_update_regulatory(wiphy, reg_request->initiator);
out:
+ mutex_unlock(&reg_mutex);
mutex_unlock(&cfg80211_mutex);
}
@@ -1615,9 +1620,13 @@ static void reg_process_pending_hints(void)
/* Processes beacon hints -- this has nothing to do with country IEs */
static void reg_process_pending_beacon_hints(void)
{
- struct cfg80211_registered_device *drv;
+ struct cfg80211_registered_device *rdev;
struct reg_beacon *pending_beacon, *tmp;
+ /*
+ * No need to hold the reg_mutex here as we just touch wiphys
+ * and do not read or access regulatory variables.
+ */
mutex_lock(&cfg80211_mutex);
/* This goes through the _pending_ beacon list */
@@ -1634,8 +1643,8 @@ static void reg_process_pending_beacon_hints(void)
list_del_init(&pending_beacon->list);
/* Applies the beacon hint to current wiphys */
- list_for_each_entry(drv, &cfg80211_drv_list, list)
- wiphy_update_new_beacon(&drv->wiphy, pending_beacon);
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+ wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
/* Remembers the beacon hint for new wiphys or reg changes */
list_add_tail(&pending_beacon->list, &reg_beacon_list);
@@ -1739,12 +1748,13 @@ int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
}
EXPORT_SYMBOL(regulatory_hint);
+/* Caller must hold reg_mutex */
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
u32 country_ie_checksum)
{
struct wiphy *request_wiphy;
- assert_cfg80211_lock();
+ assert_reg_lock();
if (unlikely(last_request->initiator !=
NL80211_REGDOM_SET_BY_COUNTRY_IE))
@@ -1767,6 +1777,10 @@ static bool reg_same_country_ie_hint(struct wiphy *wiphy,
return false;
}
+/*
+ * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
+ * therefore cannot iterate over the rdev list here.
+ */
void regulatory_hint_11d(struct wiphy *wiphy,
u8 *country_ie,
u8 country_ie_len)
@@ -1777,12 +1791,10 @@ void regulatory_hint_11d(struct wiphy *wiphy,
enum environment_cap env = ENVIRON_ANY;
struct regulatory_request *request;
- mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
- if (unlikely(!last_request)) {
- mutex_unlock(&cfg80211_mutex);
- return;
- }
+ if (unlikely(!last_request))
+ goto out;
/* IE len must be evenly divisible by 2 */
if (country_ie_len & 0x01)
@@ -1808,54 +1820,14 @@ void regulatory_hint_11d(struct wiphy *wiphy,
env = ENVIRON_OUTDOOR;
/*
- * We will run this for *every* beacon processed for the BSSID, so
- * we optimize an early check to exit out early if we don't have to
- * do anything
+ * We will run this only upon a successful connection on cfg80211.
+ * We leave conflict resolution to the workqueue, where can hold
+ * cfg80211_mutex.
*/
if (likely(last_request->initiator ==
NL80211_REGDOM_SET_BY_COUNTRY_IE &&
- wiphy_idx_valid(last_request->wiphy_idx))) {
- struct cfg80211_registered_device *drv_last_ie;
-
- drv_last_ie =
- cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
-
- /*
- * Lets keep this simple -- we trust the first AP
- * after we intersect with CRDA
- */
- if (likely(&drv_last_ie->wiphy == wiphy)) {
- /*
- * Ignore IEs coming in on this wiphy with
- * the same alpha2 and environment cap
- */
- if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
- alpha2) &&
- env == drv_last_ie->env)) {
- goto out;
- }
- /*
- * the wiphy moved on to another BSSID or the AP
- * was reconfigured. XXX: We need to deal with the
- * case where the user suspends and goes to goes
- * to another country, and then gets IEs from an
- * AP with different settings
- */
- goto out;
- } else {
- /*
- * Ignore IEs coming in on two separate wiphys with
- * the same alpha2 and environment cap
- */
- if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
- alpha2) &&
- env == drv_last_ie->env)) {
- goto out;
- }
- /* We could potentially intersect though */
- goto out;
- }
- }
+ wiphy_idx_valid(last_request->wiphy_idx)))
+ goto out;
rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
if (!rd)
@@ -1890,7 +1862,7 @@ void regulatory_hint_11d(struct wiphy *wiphy,
request->country_ie_checksum = checksum;
request->country_ie_env = env;
- mutex_unlock(&cfg80211_mutex);
+ mutex_unlock(&reg_mutex);
queue_regulatory_request(request);
@@ -1899,9 +1871,8 @@ void regulatory_hint_11d(struct wiphy *wiphy,
free_rd_out:
kfree(rd);
out:
- mutex_unlock(&cfg80211_mutex);
+ mutex_unlock(&reg_mutex);
}
-EXPORT_SYMBOL(regulatory_hint_11d);
static bool freq_is_chan_12_13_14(u16 freq)
{
@@ -1996,14 +1967,14 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
if (last_request->initiator ==
NL80211_REGDOM_SET_BY_COUNTRY_IE) {
- struct cfg80211_registered_device *drv;
- drv = cfg80211_drv_by_wiphy_idx(
+ struct cfg80211_registered_device *rdev;
+ rdev = cfg80211_rdev_by_wiphy_idx(
last_request->wiphy_idx);
- if (drv) {
+ if (rdev) {
printk(KERN_INFO "cfg80211: Current regulatory "
"domain updated by AP to: %c%c\n",
- drv->country_ie_alpha2[0],
- drv->country_ie_alpha2[1]);
+ rdev->country_ie_alpha2[0],
+ rdev->country_ie_alpha2[1]);
} else
printk(KERN_INFO "cfg80211: Current regulatory "
"domain intersected: \n");
@@ -2064,7 +2035,7 @@ static inline void reg_country_ie_process_debug(
static int __set_regdom(const struct ieee80211_regdomain *rd)
{
const struct ieee80211_regdomain *intersected_rd = NULL;
- struct cfg80211_registered_device *drv = NULL;
+ struct cfg80211_registered_device *rdev = NULL;
struct wiphy *request_wiphy;
/* Some basic sanity checks first */
@@ -2203,11 +2174,11 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
if (!intersected_rd)
return -EINVAL;
- drv = wiphy_to_dev(request_wiphy);
+ rdev = wiphy_to_dev(request_wiphy);
- drv->country_ie_alpha2[0] = rd->alpha2[0];
- drv->country_ie_alpha2[1] = rd->alpha2[1];
- drv->env = last_request->country_ie_env;
+ rdev->country_ie_alpha2[0] = rd->alpha2[0];
+ rdev->country_ie_alpha2[1] = rd->alpha2[1];
+ rdev->env = last_request->country_ie_env;
BUG_ON(intersected_rd == rd);
@@ -2232,10 +2203,13 @@ int set_regdom(const struct ieee80211_regdomain *rd)
assert_cfg80211_lock();
+ mutex_lock(&reg_mutex);
+
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
if (r) {
kfree(rd);
+ mutex_unlock(&reg_mutex);
return r;
}
@@ -2250,6 +2224,8 @@ int set_regdom(const struct ieee80211_regdomain *rd)
nl80211_send_reg_change_event(last_request);
+ mutex_unlock(&reg_mutex);
+
return r;
}
@@ -2260,16 +2236,20 @@ void reg_device_remove(struct wiphy *wiphy)
assert_cfg80211_lock();
+ mutex_lock(&reg_mutex);
+
kfree(wiphy->regd);
if (last_request)
request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
if (!request_wiphy || request_wiphy != wiphy)
- return;
+ goto out;
last_request->wiphy_idx = WIPHY_IDX_STALE;
last_request->country_ie_env = ENVIRON_ANY;
+out:
+ mutex_unlock(&reg_mutex);
}
int regulatory_init(void)
@@ -2288,22 +2268,12 @@ int regulatory_init(void)
printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
print_regdomain_info(cfg80211_regdomain);
- /*
- * The old code still requests for a new regdomain and if
- * you have CRDA you get it updated, otherwise you get
- * stuck with the static values. Since "EU" is not a valid
- * ISO / IEC 3166 alpha2 code we can't expect userpace to
- * give us a regulatory domain for it. We need last_request
- * iniitalized though so lets just send a request which we
- * know will be ignored... this crap will be removed once
- * OLD_REG dies.
- */
- err = regulatory_hint_core(ieee80211_regdom);
#else
cfg80211_regdomain = cfg80211_world_regdom;
- err = regulatory_hint_core(ieee80211_regdom);
#endif
+ /* We always try to get an update for the static regdomain */
+ err = regulatory_hint_core(cfg80211_regdomain->alpha2);
if (err) {
if (err == -ENOMEM)
return err;
@@ -2322,6 +2292,13 @@ int regulatory_init(void)
#endif
}
+ /*
+ * Finally, if the user set the module parameter treat it
+ * as a user hint.
+ */
+ if (!is_world_regdom(ieee80211_regdom))
+ regulatory_hint_user(ieee80211_regdom);
+
return 0;
}
@@ -2333,6 +2310,7 @@ void regulatory_exit(void)
cancel_work_sync(&reg_work);
mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
reset_regdomains();
@@ -2371,5 +2349,6 @@ void regulatory_exit(void)
}
spin_unlock(&reg_requests_lock);
+ mutex_unlock(&reg_mutex);
mutex_unlock(&cfg80211_mutex);
}
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