We do this so later on we can move the pending requests onto a
workqueue. By using the wiphy_idx instead of the wiphy we can
later easily check if the wiphy has disappeared or not.
Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
---
include/net/cfg80211.h | 6 ++--
net/wireless/core.c | 18 ++++++++++-
net/wireless/core.h | 21 ++++++++++++++
net/wireless/reg.c | 73 ++++++++++++++++++++++++++++++++----------------
4 files changed, 89 insertions(+), 29 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c0d1f5b..2a83510 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -375,9 +375,9 @@ enum environment_cap {
};
/**
- * struct regulatory_request - receipt of last regulatory request
+ * struct regulatory_request - used to keep track of regulatory requests
*
- * @wiphy: this is set if this request's initiator is
+ * @wiphy_idx: this is set if this request's initiator is
* %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This
* can be used by the wireless core to deal with conflicts
* and potentially inform users of which devices specifically
@@ -398,7 +398,7 @@ enum environment_cap {
* indoor, or if it doesn't matter
*/
struct regulatory_request {
- struct wiphy *wiphy;
+ int wiphy_idx;
enum reg_set_by initiator;
char alpha2[2];
bool intersect;
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 6807538..2024664 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -41,13 +41,14 @@ DEFINE_MUTEX(cfg80211_mutex);
static struct dentry *ieee80211_debugfs_dir;
/* requires cfg80211_drv_mutex to be held! */
-static struct cfg80211_registered_device *
-cfg80211_drv_by_wiphy_idx(int wiphy_idx)
+struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx)
{
struct cfg80211_registered_device *result = NULL, *drv;
assert_cfg80211_lock();
+ WARN_ON(!wiphy_idx_valid(wiphy_idx));
+
list_for_each_entry(drv, &cfg80211_drv_list, list) {
if (drv->wiphy_idx == wiphy_idx) {
result = drv;
@@ -58,6 +59,19 @@ cfg80211_drv_by_wiphy_idx(int wiphy_idx)
return result;
}
+/* requires cfg80211_drv_mutex to be held! */
+struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
+{
+ struct cfg80211_registered_device *drv;
+
+ assert_cfg80211_lock();
+
+ drv = cfg80211_drv_by_wiphy_idx(wiphy_idx);
+ if (!drv)
+ return NULL;
+ return &drv->wiphy;
+}
+
/* requires cfg80211_mutex to be held! */
static struct cfg80211_registered_device *
__cfg80211_drv_from_info(struct genl_info *info)
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 2500dbc..df1e9ff 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -78,6 +78,22 @@ static inline void assert_cfg80211_lock(void)
BUG_ON(!mutex_is_locked(&cfg80211_mutex));
}
+/*
+ * You can use this to mark a wiphy_idx as not having an associated wiphy.
+ * It guarantees cfg80211_drv_by_wiphy_idx(wiphy_idx) will return NULL
+ */
+#define WIPHY_IDX_STALE -1
+
+static inline
+int wiphy_idx(struct wiphy *wiphy)
+{
+ struct cfg80211_registered_device *drv;
+ if (!wiphy)
+ return WIPHY_IDX_STALE;
+ drv = wiphy_to_dev(wiphy);
+ return drv->wiphy_idx;
+}
+
struct cfg80211_internal_bss {
struct list_head list;
struct rb_node rbn;
@@ -87,6 +103,8 @@ struct cfg80211_internal_bss {
struct cfg80211_bss pub;
};
+struct cfg80211_registered_device *cfg80211_drv_by_wiphy_idx(int wiphy_idx);
+
/*
* This function returns a pointer to the driver
* that the genl_info item that is passed refers to.
@@ -110,6 +128,9 @@ struct cfg80211_internal_bss {
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info);
+/* requires cfg80211_drv_mutex to be held! */
+struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
+
/* identical to cfg80211_get_dev_from_info but only operate on ifindex */
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(int ifindex);
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index aab1c69..316b2e4 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -829,9 +829,13 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
const struct ieee80211_power_rule *power_rule = NULL;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
+ struct wiphy *request_wiphy;
assert_cfg80211_lock();
+ if (wiphy_idx_valid(last_request->wiphy_idx))
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
sband = wiphy->bands[band];
BUG_ON(chan_idx >= sband->n_channels);
chan = &sband->channels[chan_idx];
@@ -879,8 +883,8 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
power_rule = ®_rule->power_rule;
if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
- last_request->wiphy && last_request->wiphy == wiphy &&
- last_request->wiphy->strict_regulatory) {
+ request_wiphy && request_wiphy == wiphy &&
+ request_wiphy->strict_regulatory) {
/* This gaurantees the driver's requested regulatory domain
* will always be used as a base for further regulatory
* settings */
@@ -1044,6 +1048,11 @@ static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
const char *alpha2)
{
+ /*
+ * NB: there should be no need to use request_wiphy when in
+ * REGDOM_SET_BY_CORE, as no wiphys should have sent hints by then
+ */
+ struct wiphy *request_wiphy;
if (set_by != REGDOM_SET_BY_CORE)
assert_cfg80211_lock();
@@ -1062,10 +1071,15 @@ static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
*/
return 0;
case REGDOM_SET_BY_COUNTRY_IE:
+
+ if (wiphy_idx_valid(last_request->wiphy_idx))
+ request_wiphy =
+ wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
if (unlikely(!is_an_alpha2(alpha2)))
return -EINVAL;
if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
- if (last_request->wiphy != wiphy) {
+ if (request_wiphy != wiphy) {
/*
* Two cards with two APs claiming different
* different Country IE alpha2s. We could
@@ -1167,7 +1181,7 @@ new_request:
request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1];
request->initiator = set_by;
- request->wiphy = wiphy;
+ request->wiphy_idx = wiphy_idx(wiphy);
request->intersect = intersect;
request->country_ie_checksum = country_ie_checksum;
request->country_ie_env = env;
@@ -1210,11 +1224,17 @@ EXPORT_SYMBOL(regulatory_hint);
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
u32 country_ie_checksum)
{
+ struct wiphy *request_wiphy;
+
assert_cfg80211_lock();
- if (!last_request->wiphy)
+ if (wiphy_idx_valid(last_request->wiphy_idx))
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
+ if (!request_wiphy)
return false;
- if (likely(last_request->wiphy != wiphy))
+
+ if (likely(request_wiphy != wiphy))
return !country_ie_integrity_changes(country_ie_checksum);
/* We should not have let these through at this point, they
* should have been picked up earlier by the first alpha2 check
@@ -1262,14 +1282,15 @@ void regulatory_hint_11d(struct wiphy *wiphy,
/* 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 */
- if (likely(last_request->wiphy)) {
+ if (wiphy_idx_valid(last_request->wiphy_idx)) {
struct cfg80211_registered_device *drv_last_ie;
- drv_last_ie = wiphy_to_dev(last_request->wiphy);
+ 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(last_request->wiphy == wiphy)) {
+ 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,
@@ -1361,13 +1382,12 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
{
if (is_intersected_alpha2(rd->alpha2)) {
- struct wiphy *wiphy = NULL;
- struct cfg80211_registered_device *drv;
if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
- if (last_request->wiphy) {
- wiphy = last_request->wiphy;
- drv = wiphy_to_dev(wiphy);
+ struct cfg80211_registered_device *drv;
+ drv = cfg80211_drv_by_wiphy_idx(
+ last_request->wiphy_idx);
+ if (drv) {
printk(KERN_INFO "cfg80211: Current regulatory "
"domain updated by AP to: %c%c\n",
drv->country_ie_alpha2[0],
@@ -1433,7 +1453,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
{
const struct ieee80211_regdomain *intersected_rd = NULL;
struct cfg80211_registered_device *drv = NULL;
- struct wiphy *wiphy = NULL;
+ struct wiphy *request_wiphy;
/* Some basic sanity checks first */
if (is_world_regdom(rd->alpha2)) {
@@ -1461,8 +1481,6 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
return -EINVAL;
}
- wiphy = last_request->wiphy;
-
/* Now lets set the regulatory domain, update all driver channels
* and finally inform them of what we have done, in case they want
* to review or adjust their own settings based on their own
@@ -1478,6 +1496,9 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
return -EINVAL;
}
+ if (wiphy_idx_valid(last_request->wiphy_idx))
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
if (!last_request->intersect) {
int r;
@@ -1490,9 +1511,9 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
/* For a driver hint, lets copy the regulatory domain the
* driver wanted to the wiphy to deal with conflicts */
- BUG_ON(last_request->wiphy->regd);
+ BUG_ON(request_wiphy->regd);
- r = reg_copy_regd(&last_request->wiphy->regd, rd);
+ r = reg_copy_regd(&request_wiphy->regd, rd);
if (r)
return r;
@@ -1513,7 +1534,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
* However if a driver requested this specific regulatory
* domain we keep it for its private use */
if (last_request->initiator == REGDOM_SET_BY_DRIVER)
- last_request->wiphy->regd = rd;
+ request_wiphy->regd = rd;
else
kfree(rd);
@@ -1553,7 +1574,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
if (!intersected_rd)
return -EINVAL;
- drv = wiphy_to_dev(wiphy);
+ drv = wiphy_to_dev(request_wiphy);
drv->country_ie_alpha2[0] = rd->alpha2[0];
drv->country_ie_alpha2[1] = rd->alpha2[1];
@@ -1602,14 +1623,18 @@ int set_regdom(const struct ieee80211_regdomain *rd)
/* Caller must hold cfg80211_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
+ struct wiphy *request_wiphy;
+
assert_cfg80211_lock();
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
kfree(wiphy->regd);
- if (!last_request || !last_request->wiphy)
+ if (!last_request || !request_wiphy)
return;
- if (last_request->wiphy != wiphy)
+ if (request_wiphy != wiphy)
return;
- last_request->wiphy = NULL;
+ last_request->wiphy_idx = WIPHY_IDX_STALE;
last_request->country_ie_env = ENVIRON_ANY;
}
--
1.6.1.2.253.ga34a
--
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