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nl80211: Parse channel type attribute in an ibss join request

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Prepare cfg80211 for IBSS HT:
 * extend cfg80211 ibss struct with channel_type
 * Check if extension channel can be used
 * Export can_beacon_sec_chan for use in mac80211 (will be called
   from ibss.c later).

Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
[siwu@hrz.tu-chemnitz.de: Updates]
* fix cfg80211_can_beacon_ext_chan comment
* remove implicit channel_type enum assumptions
* remove radar channel flags check
* add HT IBSS feature flag
* reword commit message

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Alexander Simon 2011-11-30 16:56:32 +01:00 committed by John W. Linville
parent 2b50b8f588
commit 54858ee5bf
4 changed files with 50 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/nl80211.h
View File

@ -2785,9 +2785,11 @@ enum nl80211_ap_sme_features {
* @NL80211_FEATURE_SK_TX_STATUS: This driver supports reflecting back
* TX status to the socket error queue when requested with the
* socket option.
* @NL80211_FEATURE_HT_IBSS: This driver supports IBSS with HT datarates.
*/
enum nl80211_feature_flags {
NL80211_FEATURE_SK_TX_STATUS = 1 << 0,
NL80211_FEATURE_HT_IBSS = 1 << 1,
};
/**

11
include/net/cfg80211.h
View File

@ -1149,6 +1149,7 @@ struct cfg80211_ibss_params {
u8 *ssid;
u8 *bssid;
struct ieee80211_channel *channel;
enum nl80211_channel_type channel_type;
u8 *ie;
u8 ssid_len, ie_len;
u16 beacon_interval;
@ -3267,6 +3268,16 @@ void cfg80211_report_obss_beacon(struct wiphy *wiphy,
const u8 *frame, size_t len,
int freq, gfp_t gfp);
/*
* cfg80211_can_beacon_sec_chan - test if ht40 on extension channel can be used
* @wiphy: the wiphy
* @chan: main channel
* @channel_type: HT mode
*/
int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type);
/* Logging, debugging and troubleshooting/diagnostic helpers. */
/* wiphy_printk helpers, similar to dev_printk */

12
net/wireless/chan.c
View File

@ -6,6 +6,7 @@
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
*/
#include <linux/export.h>
#include <net/cfg80211.h>
#include "core.h"
@ -44,9 +45,9 @@ rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
return chan;
}
static bool can_beacon_sec_chan(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type)
int cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type)
{
struct ieee80211_channel *sec_chan;
int diff;
@ -75,6 +76,7 @@ static bool can_beacon_sec_chan(struct wiphy *wiphy,
return true;
}
EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan);
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev, int freq,
@ -109,8 +111,8 @@ int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
switch (channel_type) {
case NL80211_CHAN_HT40PLUS:
case NL80211_CHAN_HT40MINUS:
if (!can_beacon_sec_chan(&rdev->wiphy, chan,
channel_type)) {
if (!cfg80211_can_beacon_sec_chan(&rdev->wiphy, chan,
channel_type)) {
printk(KERN_DEBUG
"cfg80211: Secondary channel not "
"allowed to initiate communication\n");

32
net/wireless/nl80211.c
View File

@ -4682,13 +4682,41 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
ibss.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
}
ibss.channel = ieee80211_get_channel(wiphy,
nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]));
if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
enum nl80211_channel_type channel_type;
channel_type = nla_get_u32(
info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
if (channel_type != NL80211_CHAN_NO_HT &&
channel_type != NL80211_CHAN_HT20 &&
channel_type != NL80211_CHAN_HT40MINUS &&
channel_type != NL80211_CHAN_HT40PLUS)
return -EINVAL;
if (channel_type != NL80211_CHAN_NO_HT &&
!(wiphy->features & NL80211_FEATURE_HT_IBSS))
return -EINVAL;
ibss.channel_type = channel_type;
} else {
ibss.channel_type = NL80211_CHAN_NO_HT;
}
ibss.channel = rdev_freq_to_chan(rdev,
nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]),
ibss.channel_type);
if (!ibss.channel ||
ibss.channel->flags & IEEE80211_CHAN_NO_IBSS ||
ibss.channel->flags & IEEE80211_CHAN_DISABLED)
return -EINVAL;
/* Both channels should be able to initiate communication */
if ((ibss.channel_type == NL80211_CHAN_HT40PLUS ||
ibss.channel_type == NL80211_CHAN_HT40MINUS) &&
!cfg80211_can_beacon_sec_chan(&rdev->wiphy, ibss.channel,
ibss.channel_type))
return -EINVAL;
ibss.channel_fixed = !!info->attrs[NL80211_ATTR_FREQ_FIXED];
ibss.privacy = !!info->attrs[NL80211_ATTR_PRIVACY];