Commit adbfb058 authored by Luis R. Rodriguez's avatar Luis R. Rodriguez Committed by Johannes Berg

cfg80211: intersection dfs regions when intersecting regdomains

Only allow DFS to be set if the DFS regions agree.
Signed-off-by: default avatarLuis R. Rodriguez <>
Signed-off-by: default avatarJohannes Berg <>
parent 4c7d3982
......@@ -570,6 +570,20 @@ static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
* Later on we can perhaps use the more restrictive DFS
* region but we don't have information for that yet so
* for now simply disallow conflicts.
static enum nl80211_dfs_regions
reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
const enum nl80211_dfs_regions dfs_region2)
if (dfs_region1 != dfs_region2)
return NL80211_DFS_UNSET;
return dfs_region1;
* Helper for regdom_intersect(), this does the real
* mathematical intersection fun
......@@ -701,6 +715,8 @@ regdom_intersect(const struct ieee80211_regdomain *rd1,
rd->n_reg_rules = num_rules;
rd->alpha2[0] = '9';
rd->alpha2[1] = '8';
rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
return rd;
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