cfg80211: Fix regression with 11d on bands

This fixes a regression on disallowing bands introduced with the new
802.11d support. The issue is that IEEE-802.11 allows APs to send
a subset of what a country regulatory domain defines. This was clarified
in this document:

http://tinyurl.com/11d-clarification

As such it is possible, and this is what is done in practice, that a
single band 2.4 GHz AP will only send 2.4 GHz band regulatory information
through the 802.11 country information element and then the current
intersection with what CRDA provided yields a regulatory domain with
no 5 GHz information -- even though that country may actually allow
5 GHz operation. We correct this by only applying the intersection rules
on a channel if the the intersection yields a regulatory rule on the
same band the channel is on.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index af805b0..5f6d20d 100644 (file)
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -421,6 +421,31 @@ static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
        return 0;
 }
 
+/**
+ * freq_in_rule_band - tells us if a frequency is in a frequency band
+ * @freq_range: frequency rule we want to query
+ * @freq_khz: frequency we are inquiring about
+ *
+ * This lets us know if a specific frequency rule is or is not relevant to
+ * a specific frequency's band. Bands are device specific and artificial
+ * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
+ * safe for now to assume that a frequency rule should not be part of a
+ * frequency's band if the start freq or end freq are off by more than 2 GHz.
+ * This resolution can be lowered and should be considered as we add
+ * regulatory rule support for other "bands".
+ **/
+static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
+       u32 freq_khz)
+{
+#define ONE_GHZ_IN_KHZ 1000000
+       if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
+               return true;
+       if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
+               return true;
+       return false;
+#undef ONE_GHZ_IN_KHZ
+}
+
 /* Converts a country IE to a regulatory domain. A regulatory domain
  * structure has a lot of information which the IE doesn't yet have,
  * so for the other values we use upper max values as we will intersect
@@ -748,12 +773,23 @@ static u32 map_regdom_flags(u32 rd_flags)
  *     this value to the maximum allowed bandwidth.
  * @reg_rule: the regulatory rule which we have for this frequency
  *
- * Use this function to get the regulatory rule for a specific frequency.
+ * Use this function to get the regulatory rule for a specific frequency on
+ * a given wireless device. If the device has a specific regulatory domain
+ * it wants to follow we respect that unless a country IE has been received
+ * and processed already.
+ *
+ * Returns 0 if it was able to find a valid regulatory rule which does
+ * apply to the given center_freq otherwise it returns non-zero. It will
+ * also return -ERANGE if we determine the given center_freq does not even have
+ * a regulatory rule for a frequency range in the center_freq's band. See
+ * freq_in_rule_band() for our current definition of a band -- this is purely
+ * subjective and right now its 802.11 specific.
  */
 static int freq_reg_info(u32 center_freq, u32 *bandwidth,
                         const struct ieee80211_reg_rule **reg_rule)
 {
        int i;
+       bool band_rule_found = false;
        u32 max_bandwidth = 0;
 
        if (!cfg80211_regdomain)
@@ -767,7 +803,15 @@ static int freq_reg_info(u32 center_freq, u32 *bandwidth,
                rr = &cfg80211_regdomain->reg_rules[i];
                fr = &rr->freq_range;
                pr = &rr->power_rule;
+
+               /* We only need to know if one frequency rule was
+                * was in center_freq's band, that's enough, so lets
+                * not overwrite it once found */
+               if (!band_rule_found)
+                       band_rule_found = freq_in_rule_band(fr, center_freq);
+
                max_bandwidth = freq_max_bandwidth(fr, center_freq);
+
                if (max_bandwidth && *bandwidth <= max_bandwidth) {
                        *reg_rule = rr;
                        *bandwidth = max_bandwidth;
@@ -775,6 +819,9 @@ static int freq_reg_info(u32 center_freq, u32 *bandwidth,
                }
        }
 
+       if (!band_rule_found)
+               return -ERANGE;
+
        return !max_bandwidth;
 }
 
@@ -799,8 +846,37 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
                &max_bandwidth, &reg_rule);
 
        if (r) {
-               flags |= IEEE80211_CHAN_DISABLED;
-               chan->flags = flags;
+               /* This means no regulatory rule was found in the country IE
+                * with a frequency range on the center_freq's band, since
+                * IEEE-802.11 allows for a country IE to have a subset of the
+                * regulatory information provided in a country we ignore
+                * disabling the channel unless at least one reg rule was
+                * found on the center_freq's band. For details see this
+                * clarification:
+                *
+                * http://tinyurl.com/11d-clarification
+                */
+               if (r == -ERANGE &&
+                   last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
+#ifdef CONFIG_CFG80211_REG_DEBUG
+                       printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
+                               "intact on %s - no rule found in band on "
+                               "Country IE\n",
+                               chan->center_freq, wiphy_name(wiphy));
+#endif
+               } else {
+               /* In this case we know the country IE has at least one reg rule
+                * for the band so we respect its band definitions */
+#ifdef CONFIG_CFG80211_REG_DEBUG
+                       if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
+                               printk(KERN_DEBUG "cfg80211: Disabling "
+                                       "channel %d MHz on %s due to "
+                                       "Country IE\n",
+                                       chan->center_freq, wiphy_name(wiphy));
+#endif
+                       flags |= IEEE80211_CHAN_DISABLED;
+                       chan->flags = flags;
+               }
                return;
        }