#include "core.h"
#include "reg.h"
-/*
- * wiphy is set if this request's initiator is
- * REGDOM_SET_BY_COUNTRY_IE or _DRIVER
+/**
+ * struct regulatory_request - receipt of last regulatory request
+ *
+ * @wiphy: 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
+ * cased the conflicts.
+ * @initiator: indicates who sent this request, could be any of
+ * of those set in reg_set_by, %REGDOM_SET_BY_*
+ * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested
+ * regulatory domain. We have a few special codes:
+ * 00 - World regulatory domain
+ * 99 - built by driver but a specific alpha2 cannot be determined
+ * 98 - result of an intersection between two regulatory domains
+ * @intersect: indicates whether the wireless core should intersect
+ * the requested regulatory domain with the presently set regulatory
+ * domain.
*/
struct regulatory_request {
struct wiphy *wiphy;
enum reg_set_by initiator;
char alpha2[2];
+ bool intersect;
};
+/* Receipt of information from last regulatory request */
static struct regulatory_request *last_request;
/* To trigger userspace events */
return 0;
}
+/* Helper for regdom_intersect(), this does the real
+ * mathematical intersection fun */
+static int reg_rules_intersect(
+ const struct ieee80211_reg_rule *rule1,
+ const struct ieee80211_reg_rule *rule2,
+ struct ieee80211_reg_rule *intersected_rule)
+{
+ const struct ieee80211_freq_range *freq_range1, *freq_range2;
+ struct ieee80211_freq_range *freq_range;
+ const struct ieee80211_power_rule *power_rule1, *power_rule2;
+ struct ieee80211_power_rule *power_rule;
+ u32 freq_diff;
+
+ freq_range1 = &rule1->freq_range;
+ freq_range2 = &rule2->freq_range;
+ freq_range = &intersected_rule->freq_range;
+
+ power_rule1 = &rule1->power_rule;
+ power_rule2 = &rule2->power_rule;
+ power_rule = &intersected_rule->power_rule;
+
+ freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
+ freq_range2->start_freq_khz);
+ freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
+ freq_range2->end_freq_khz);
+ freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
+ freq_range2->max_bandwidth_khz);
+
+ freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
+ if (freq_range->max_bandwidth_khz > freq_diff)
+ freq_range->max_bandwidth_khz = freq_diff;
+
+ power_rule->max_eirp = min(power_rule1->max_eirp,
+ power_rule2->max_eirp);
+ power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
+ power_rule2->max_antenna_gain);
+
+ intersected_rule->flags = (rule1->flags | rule2->flags);
+
+ if (!is_valid_reg_rule(intersected_rule))
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * regdom_intersect - do the intersection between two regulatory domains
+ * @rd1: first regulatory domain
+ * @rd2: second regulatory domain
+ *
+ * Use this function to get the intersection between two regulatory domains.
+ * Once completed we will mark the alpha2 for the rd as intersected, "98",
+ * as no one single alpha2 can represent this regulatory domain.
+ *
+ * Returns a pointer to the regulatory domain structure which will hold the
+ * resulting intersection of rules between rd1 and rd2. We will
+ * kzalloc() this structure for you.
+ */
+static struct ieee80211_regdomain *regdom_intersect(
+ const struct ieee80211_regdomain *rd1,
+ const struct ieee80211_regdomain *rd2)
+{
+ int r, size_of_regd;
+ unsigned int x, y;
+ unsigned int num_rules = 0, rule_idx = 0;
+ const struct ieee80211_reg_rule *rule1, *rule2;
+ struct ieee80211_reg_rule *intersected_rule;
+ struct ieee80211_regdomain *rd;
+ /* This is just a dummy holder to help us count */
+ struct ieee80211_reg_rule irule;
+
+ /* Uses the stack temporarily for counter arithmetic */
+ intersected_rule = &irule;
+
+ memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
+
+ if (!rd1 || !rd2)
+ return NULL;
+
+ /* First we get a count of the rules we'll need, then we actually
+ * build them. This is to so we can malloc() and free() a
+ * regdomain once. The reason we use reg_rules_intersect() here
+ * is it will return -EINVAL if the rule computed makes no sense.
+ * All rules that do check out OK are valid. */
+
+ for (x = 0; x < rd1->n_reg_rules; x++) {
+ rule1 = &rd1->reg_rules[x];
+ for (y = 0; y < rd2->n_reg_rules; y++) {
+ rule2 = &rd2->reg_rules[y];
+ if (!reg_rules_intersect(rule1, rule2,
+ intersected_rule))
+ num_rules++;
+ memset(intersected_rule, 0,
+ sizeof(struct ieee80211_reg_rule));
+ }
+ }
+
+ if (!num_rules)
+ return NULL;
+
+ size_of_regd = sizeof(struct ieee80211_regdomain) +
+ ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
+
+ rd = kzalloc(size_of_regd, GFP_KERNEL);
+ if (!rd)
+ return NULL;
+
+ for (x = 0; x < rd1->n_reg_rules; x++) {
+ rule1 = &rd1->reg_rules[x];
+ for (y = 0; y < rd2->n_reg_rules; y++) {
+ rule2 = &rd2->reg_rules[y];
+ /* This time around instead of using the stack lets
+ * write to the target rule directly saving ourselves
+ * a memcpy() */
+ intersected_rule = &rd->reg_rules[rule_idx];
+ r = reg_rules_intersect(rule1, rule2,
+ intersected_rule);
+ /* No need to memset here the intersected rule here as
+ * we're not using the stack anymore */
+ if (r)
+ continue;
+ rule_idx++;
+ }
+ }
+
+ if (rule_idx != num_rules) {
+ kfree(rd);
+ return NULL;
+ }
+
+ rd->n_reg_rules = num_rules;
+ rd->alpha2[0] = '9';
+ rd->alpha2[1] = '8';
+
+ return rd;
+}
+
/* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
* want to just have the channel structure use these */
static u32 map_regdom_flags(u32 rd_flags)
}
}
+/* Return value which can be used by ignore_request() to indicate
+ * it has been determined we should intersect two regulatory domains */
+#define REG_INTERSECT 1
+
/* This has the logic which determines when a new request
* should be ignored. */
static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
return -EALREADY;
return 0;
case REGDOM_SET_BY_USER:
- /*
- * If the user wants to override the AP's hint, we may
- * need to follow both and use the intersection. For now,
- * reject any such attempt (but we don't support country
- * IEs right now anyway.)
- */
if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
- return -EOPNOTSUPP;
+ return REG_INTERSECT;
return 0;
}
const char *alpha2)
{
struct regulatory_request *request;
+ bool intersect = false;
int r = 0;
r = ignore_request(wiphy, set_by, alpha2);
- if (r)
+
+ if (r == REG_INTERSECT)
+ intersect = true;
+ else if (r)
return r;
switch (set_by) {
request->alpha2[1] = alpha2[1];
request->initiator = set_by;
request->wiphy = wiphy;
+ request->intersect = intersect;
kfree(last_request);
last_request = request;
/* Takes ownership of rd only if it doesn't fail */
static int __set_regdom(const struct ieee80211_regdomain *rd)
{
+ const struct ieee80211_regdomain *intersected_rd = NULL;
/* Some basic sanity checks first */
if (is_world_regdom(rd->alpha2)) {
return -EOPNOTSUPP;
}
+ if (unlikely(last_request->intersect)) {
+ intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
+ if (!intersected_rd)
+ return -EINVAL;
+ kfree(rd);
+ rd = intersected_rd;
+ }
+
/* Tada! */
cfg80211_regdomain = rd;
projects / linux-2.6-omap-h63xx.git / blobdiff