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authorSteinar H. Gunderson <sgunderson@bigfoot.com>2014-09-03 06:48:37 -0700
committerJohannes Berg <johannes@sipsolutions.net>2014-09-08 10:52:00 +0200
commitc8d6591752e96c550cb98b781326d72d8eedcc79 (patch)
treed4d37883b8782d9a2fae6a32382f110dba7c2984 /net/mac80211/ieee80211_i.h
parent24a4e4008ca2a819c4c889163586a8a9b7a3a08d (diff)
downloadop-kernel-dev-c8d6591752e96c550cb98b781326d72d8eedcc79.zip
op-kernel-dev-c8d6591752e96c550cb98b781326d72d8eedcc79.tar.gz
mac80211: support DTPC IE (from Cisco Client eXtensions)
Linux already supports 802.11h, where the access point can tell the client to reduce its transmission power. However, 802.11h is only defined for 5 GHz, where the need for this is much smaller than on 2.4 GHz. Cisco has their own solution, called DTPC (Dynamic Transmit Power Control). Cisco APs on a controller sometimes but not always send 802.11h; they always send DTPC, even on 2.4 GHz. This patch adds support for parsing and honoring the DTPC IE in addition to the 802.11h element (they do not always contain the same limits, so both must be honored); the format is not documented, but very simple. Tested (on top of wireless.git and on 3.16.1) against a Cisco Aironet 1142 joined to a Cisco 2504 WLC, by setting various transmit power levels for the given access points and observing the results. The Wireshark 802.11 dissector agrees with the interpretation of the element, except for negative numbers, which seem to never happen anyway. Signed-off-by: Steinar H. Gunderson <sgunderson@bigfoot.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Diffstat (limited to 'net/mac80211/ieee80211_i.h')
-rw-r--r--net/mac80211/ieee80211_i.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 6b7bdd8..c2aaec4 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1369,6 +1369,7 @@ struct ieee802_11_elems {
const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
const u8 *country_elem;
const u8 *pwr_constr_elem;
+ const u8 *cisco_dtpc_elem;
const struct ieee80211_timeout_interval_ie *timeout_int;
const u8 *opmode_notif;
const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
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