Index: sys/net80211/ieee80211_regdomain.c
===================================================================
--- sys/net80211/ieee80211_regdomain.c
+++ sys/net80211/ieee80211_regdomain.c
@@ -64,17 +64,112 @@
 	return 0;		/* accept anything */
 }
 
+/* FCC regdomain limitations. Extracted from regdomain.xml */
+static const struct freqband {
+	uint16_t	freq_min;
+	uint16_t	freq_max;
+	int8_t		maxregpower;
+	uint32_t	flags;
+} fcc_bands[] = {
+	{ 2412,	2462, 30, IEEE80211_CHAN_B },
+	{ 2412, 2462, 30, IEEE80211_CHAN_G },
+	{ 2412, 2462, 30, IEEE80211_CHAN_G | IEEE80211_CHAN_HT20 },
+	{ 2432, 2462, 30, IEEE80211_CHAN_G | IEEE80211_CHAN_HT40D },
+	{ 2412, 2442, 30, IEEE80211_CHAN_G | IEEE80211_CHAN_HT40U },
+	{ 5180, 5240, 17, IEEE80211_CHAN_A },
+	{ 5180, 5240, 17, IEEE80211_CHAN_A | IEEE80211_CHAN_HT20 },
+	{ 5200, 5240, 17, IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D },
+	{ 5180, 5220, 17, IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U },
+	{ 5745, 5805, 23, IEEE80211_CHAN_A },
+	{ 5745, 5805, 23, IEEE80211_CHAN_A | IEEE80211_CHAN_HT20 },
+	{ 5765, 5805, 23, IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D },
+	{ 5745, 5785, 23, IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U },
+	{ 5825, 5825, 23, IEEE80211_CHAN_A | IEEE80211_CHAN_PASSIVE },
+	{ 0, 0, 0, 0 }
+};
+
+static void
+removechan(struct ieee80211com *ic, int idx)
+{
+	struct ieee80211_channel *chan = &ic->ic_channels[0];
+
+	KASSERT(idx < ic->ic_nchans, ("wrong index %d (%d)\n", idx,
+	    ic->ic_nchans));
+
+	ic->ic_nchans--;
+	memcpy(&chan[idx], &chan[ic->ic_nchans], sizeof(*chan));
+	memset(&chan[ic->ic_nchans], 0, sizeof(*chan));
+}
+
+static int
+checkchan(struct ieee80211_channel *c, const struct freqband fbands[])
+{
+	const struct freqband *fb;
+	uint32_t flags;
+	int i;
+
+	flags = c->ic_flags & IEEE80211_CHAN_ALLTURBO;
+	/* brute force search */
+	for (i = 0; fbands[i].freq_max != 0; i++) {
+		fb = &fbands[i];
+
+		if (flags == (fb->flags & IEEE80211_CHAN_ALLTURBO) &&
+		    fb->freq_min <= c->ic_freq &&
+		    fb->freq_max >= c->ic_freq) {
+			if (fb->maxregpower < c->ic_maxregpower) {
+				c->ic_maxregpower = fb->maxregpower;
+				c->ic_maxpower = fb->maxregpower * 2;
+
+				if (c->ic_minpower > c->ic_maxpower)
+					c->ic_minpower = c->ic_maxpower;
+			}
+			/* add PASSIVE, DFS etc flags. */
+			c->ic_flags |= (fb->flags & ~IEEE80211_CHAN_ALLTURBO);
+			return (1);
+		}
+	}
+
+	return (0);
+}
+
+static void
+channel_plan_init(struct ieee80211com *ic, const struct freqband fbands[])
+{
+	int i, found;
+
+	for (i = 0; i < ic->ic_nchans;) {
+		found = checkchan(&ic->ic_channels[i], fbands);
+		if (!found)
+			removechan(ic, i);
+		else
+			i++;
+	}
+
+	ieee80211_chan_init(ic);
+}
+
+static void
+regdomain_init(struct ieee80211com *ic)
+{
+	struct ieee80211_regdomain *rd = &ic->ic_regdomain;
+
+	/* init by default to FCC/US */
+	rd->regdomain = SKU_FCC;
+	rd->country = CTRY_UNITED_STATES;
+	rd->location = ' ';			/* both */
+	rd->isocc[0] = 'U';
+	rd->isocc[1] = 'S';
+
+	channel_plan_init(ic, fcc_bands);
+}
+
 void
 ieee80211_regdomain_attach(struct ieee80211com *ic)
 {
 	if (ic->ic_regdomain.regdomain == 0 &&
-	    ic->ic_regdomain.country == CTRY_DEFAULT) {
-		ic->ic_regdomain.country = CTRY_UNITED_STATES;	/* XXX */
-		ic->ic_regdomain.location = ' ';		/* both */
-		ic->ic_regdomain.isocc[0] = 'U';		/* XXX */
-		ic->ic_regdomain.isocc[1] = 'S';		/* XXX */
-		/* NB: driver calls ieee80211_init_channels or similar */
-	}
+	    ic->ic_regdomain.country == CTRY_DEFAULT)
+		regdomain_init(ic);
+
 	ic->ic_getradiocaps = null_getradiocaps;
 	ic->ic_setregdomain = null_setregdomain;
 }