ifconfig: set by default FCC regulatory domain for wireless interfaces.

Change default regulatory domain from DEBUG (no limitations;
exposes all device channels) to FCC; as a result, newly created wireless
interface with default settings will have less chances to violate
country-specific regulations.

This change will not affect drivers with pre-initialized regdomain
structure (currentry ath(4) and mwl(4)); in that case, the default
channel list must correspond to the default regdomain / country setting.

You can switch to another regdomain / country via corresponding
ifconfig(8) options; the driver must implement ic_getradiocaps()
method to restore full channel list.

Full country / regdomain list may be obtained via
'ifconfig <iface> list countries' command.

Example: change country to Germany:
ifconfig wlan0 down	# all wlans on the device must be down
ifconfig wlan0 country DE
ifconfig wlan0 up
# wpa_supplicant(8), dhclient(8) etc

At the creation time:
ifconfig wlan0 create wlandev wpi0 country DE

To make changes permanent add the following line to the rc.conf(5):
create_args_wlan0="country DE"

Tested with
 - Intel 3945BG (wpi(4)).
 - WUSB54GC (rum(4)).

Reviewed by:	adrian
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D6228

2 files changed, 40 insertions, 3 deletions

diff --git a/sbin/ifconfig/ifieee80211.c b/sbin/ifconfig/ifieee80211.c
index 1e1e498..82c7515 100644
--- a/sbin/ifconfig/ifieee80211.c
+++ b/sbin/ifconfig/ifieee80211.c
@@ -5141,6 +5141,44 @@ print_string(const u_int8_t *buf, int len)
 	}
 }
 
+static void
+setdefregdomain(int s)
+{
+	struct regdata *rdp = getregdata();
+	const struct regdomain *rd;
+
+	/* Check if regdomain/country was already set by a previous call. */
+	/* XXX is it possible? */
+	if (regdomain.regdomain != 0 ||
+	    regdomain.country != CTRY_DEFAULT)
+		return;
+
+	getregdomain(s);
+
+	/* Check if it was already set by the driver. */
+	if (regdomain.regdomain != 0 ||
+	    regdomain.country != CTRY_DEFAULT)
+		return;
+
+	/* Set FCC/US as default. */
+	rd = lib80211_regdomain_findbysku(rdp, SKU_FCC);
+	if (rd == NULL)
+		errx(1, "FCC regdomain was not found");
+
+	regdomain.regdomain = rd->sku;
+	if (rd->cc != NULL)
+		defaultcountry(rd);
+
+	/* Send changes to net80211. */
+	setregdomain_cb(s, &regdomain);
+
+	/* Cleanup (so it can be overriden by subsequent parameters). */
+	regdomain.regdomain = 0;
+	regdomain.country = CTRY_DEFAULT;
+	regdomain.isocc[0] = 0;
+	regdomain.isocc[1] = 0;
+}
+
 /*
  * Virtual AP cloning support.
  */
@@ -5162,6 +5200,8 @@ wlan_create(int s, struct ifreq *ifr)
 	ifr->ifr_data = (caddr_t) &params;
 	if (ioctl(s, SIOCIFCREATE2, ifr) < 0)
 		err(1, "SIOCIFCREATE2");
+
+	setdefregdomain(s);
 }
 
 static
diff --git a/sys/net80211/ieee80211_regdomain.c b/sys/net80211/ieee80211_regdomain.c
index f565a65..952208f 100644
--- a/sys/net80211/ieee80211_regdomain.c
+++ b/sys/net80211/ieee80211_regdomain.c
@@ -69,10 +69,7 @@ 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_getradiocaps = null_getradiocaps;