mac80211: parse VHT channel switch IEs
VHT introduces multiple IEs that need to be parsed for a
wide bandwidth channel switch. Two are (currently) needed
in mac80211:
* wide bandwidth channel switch element
* channel switch wrapper element
The former is contained in the latter for beacons and probe
responses, but not for the spectrum management action frames
so the IE parser needs a new argument to differentiate them.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 155056c..3f87fa4 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -661,7 +661,7 @@
}
EXPORT_SYMBOL(ieee80211_queue_delayed_work);
-u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
+u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, bool action,
struct ieee802_11_elems *elems,
u64 filter, u32 crc)
{
@@ -669,6 +669,7 @@
u8 *pos = start;
bool calc_crc = filter != 0;
DECLARE_BITMAP(seen_elems, 256);
+ const u8 *ie;
bitmap_zero(seen_elems, 256);
memset(elems, 0, sizeof(*elems));
@@ -717,6 +718,11 @@
case WLAN_EID_PWR_CONSTRAINT:
case WLAN_EID_TIMEOUT_INTERVAL:
case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
+ case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
+ /*
+ * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
+ * that if the content gets bigger it might be needed more than once
+ */
if (test_bit(id, seen_elems)) {
elems->parse_error = true;
left -= elen;
@@ -878,6 +884,34 @@
}
elems->sec_chan_offs = (void *)pos;
break;
+ case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
+ if (!action ||
+ elen != sizeof(*elems->wide_bw_chansw_ie)) {
+ elem_parse_failed = true;
+ break;
+ }
+ elems->wide_bw_chansw_ie = (void *)pos;
+ break;
+ case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
+ if (action) {
+ elem_parse_failed = true;
+ break;
+ }
+ /*
+ * This is a bit tricky, but as we only care about
+ * the wide bandwidth channel switch element, so
+ * just parse it out manually.
+ */
+ ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
+ pos, elen);
+ if (ie) {
+ if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
+ elems->wide_bw_chansw_ie =
+ (void *)(ie + 2);
+ else
+ elem_parse_failed = true;
+ }
+ break;
case WLAN_EID_COUNTRY:
elems->country_elem = pos;
elems->country_elem_len = elen;