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nl80211: Add frequency configuration (including HT40)

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This patch adds new NL80211_CMD_SET_WIPHY attributes
NL80211_ATTR_WIPHY_FREQ and NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET to allow
userspace to set the operating channel (e.g., hostapd for AP mode).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2008-11-26 16:15:24 +02:00 committed by John W. Linville
parent 72eaa43a53
commit 72bdcf3438
8 changed files with 133 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
include/linux/nl80211.h
View File

@ -26,8 +26,9 @@
* @NL80211_CMD_GET_WIPHY: request information about a wiphy or dump request
* to get a list of all present wiphys.
* @NL80211_CMD_SET_WIPHY: set wiphy parameters, needs %NL80211_ATTR_WIPHY or
* %NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME
* and/or %NL80211_ATTR_WIPHY_TXQ_PARAMS.
* %NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME,
* %NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ, and/or
* %NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET.
* @NL80211_CMD_NEW_WIPHY: Newly created wiphy, response to get request
* or rename notification. Has attributes %NL80211_ATTR_WIPHY and
* %NL80211_ATTR_WIPHY_NAME.
@ -180,6 +181,14 @@ enum nl80211_commands {
* /sys/class/ieee80211/<phyname>/index
* @NL80211_ATTR_WIPHY_NAME: wiphy name (used for renaming)
* @NL80211_ATTR_WIPHY_TXQ_PARAMS: a nested array of TX queue parameters
* @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz
* @NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET: included with NL80211_ATTR_WIPHY_FREQ
* if HT20 or HT40 are allowed (i.e., 802.11n disabled if not included):
* NL80211_SEC_CHAN_NO_HT = HT not allowed (i.e., same as not including
* this attribute)
* NL80211_SEC_CHAN_DISABLED = HT20 only
* NL80211_SEC_CHAN_BELOW = secondary channel is below the primary channel
* NL80211_SEC_CHAN_ABOVE = secondary channel is above the primary channel
*
* @NL80211_ATTR_IFINDEX: network interface index of the device to operate on
* @NL80211_ATTR_IFNAME: network interface name
@ -315,6 +324,8 @@ enum nl80211_attrs {
NL80211_ATTR_BSS_BASIC_RATES,
NL80211_ATTR_WIPHY_TXQ_PARAMS,
NL80211_ATTR_WIPHY_FREQ,
NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET,
/* add attributes here, update the policy in nl80211.c */
@ -329,6 +340,8 @@ enum nl80211_attrs {
#define NL80211_ATTR_HT_CAPABILITY NL80211_ATTR_HT_CAPABILITY
#define NL80211_ATTR_BSS_BASIC_RATES NL80211_ATTR_BSS_BASIC_RATES
#define NL80211_ATTR_WIPHY_TXQ_PARAMS NL80211_ATTR_WIPHY_TXQ_PARAMS
#define NL80211_ATTR_WIPHY_FREQ NL80211_ATTR_WIPHY_FREQ
#define NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET
#define NL80211_MAX_SUPP_RATES 32
#define NL80211_MAX_SUPP_REG_RULES 32
@ -742,4 +755,10 @@ enum nl80211_txq_q {
NL80211_TXQ_Q_BK
};
enum nl80211_sec_chan_offset {
NL80211_SEC_CHAN_NO_HT /* No HT */,
NL80211_SEC_CHAN_DISABLED /* HT20 only */,
NL80211_SEC_CHAN_BELOW /* HT40- */,
NL80211_SEC_CHAN_ABOVE /* HT40+ */
};
#endif /* __LINUX_NL80211_H */

9
include/net/cfg80211.h
View File

@ -392,6 +392,9 @@ struct ieee80211_txq_params {
/* from net/wireless.h */
struct wiphy;
/* from net/ieee80211.h */
struct ieee80211_channel;
/**
* struct cfg80211_ops - backend description for wireless configuration
*
@ -450,6 +453,8 @@ struct wiphy;
* @change_bss: Modify parameters for a given BSS.
*
* @set_txq_params: Set TX queue parameters
*
* @set_channel: Set channel
*/
struct cfg80211_ops {
int (*add_virtual_intf)(struct wiphy *wiphy, char *name,
@ -513,6 +518,10 @@ struct cfg80211_ops {
int (*set_txq_params)(struct wiphy *wiphy,
struct ieee80211_txq_params *params);
int (*set_channel)(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_sec_chan_offset);
};
#endif /* __NET_CFG80211_H */

3
include/net/mac80211.h
View File

@ -507,6 +507,9 @@ static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
struct ieee80211_ht_conf {
bool enabled;
int sec_chan_offset; /* 0 = HT40 disabled; -1 = HT40 enabled, secondary
* channel below primary; 1 = HT40 enabled,
* secondary channel above primary */
};
/**

13
net/mac80211/cfg.c
View File

@ -1095,6 +1095,18 @@ static int ieee80211_set_txq_params(struct wiphy *wiphy,
return 0;
}
static int ieee80211_set_channel(struct wiphy *wiphy,
struct ieee80211_channel *chan,
enum nl80211_sec_chan_offset sec_chan_offset)
{
struct ieee80211_local *local = wiphy_priv(wiphy);
local->oper_channel = chan;
local->oper_sec_chan_offset = sec_chan_offset;
return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
}
struct cfg80211_ops mac80211_config_ops = {
.add_virtual_intf = ieee80211_add_iface,
.del_virtual_intf = ieee80211_del_iface,
@ -1122,4 +1134,5 @@ struct cfg80211_ops mac80211_config_ops = {
#endif
.change_bss = ieee80211_change_bss,
.set_txq_params = ieee80211_set_txq_params,
.set_channel = ieee80211_set_channel,
};

1
net/mac80211/ieee80211_i.h
View File

@ -626,6 +626,7 @@ struct ieee80211_local {
struct delayed_work scan_work;
struct ieee80211_sub_if_data *scan_sdata;
struct ieee80211_channel *oper_channel, *scan_channel;
enum nl80211_sec_chan_offset oper_sec_chan_offset;
u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
size_t scan_ssid_len;
struct list_head bss_list;

34
net/mac80211/main.c
View File

@ -195,19 +195,41 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
struct ieee80211_channel *chan;
int ret = 0;
int power;
enum nl80211_sec_chan_offset sec_chan_offset;
might_sleep();
if (local->sw_scanning)
if (local->sw_scanning) {
chan = local->scan_channel;
else
sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
} else {
chan = local->oper_channel;
if (chan != local->hw.conf.channel) {
local->hw.conf.channel = chan;
changed |= IEEE80211_CONF_CHANGE_CHANNEL;
sec_chan_offset = local->oper_sec_chan_offset;
}
if (chan != local->hw.conf.channel ||
sec_chan_offset != local->hw.conf.ht.sec_chan_offset) {
local->hw.conf.channel = chan;
switch (sec_chan_offset) {
case NL80211_SEC_CHAN_NO_HT:
local->hw.conf.ht.enabled = false;
local->hw.conf.ht.sec_chan_offset = 0;
break;
case NL80211_SEC_CHAN_DISABLED:
local->hw.conf.ht.enabled = true;
local->hw.conf.ht.sec_chan_offset = 0;
break;
case NL80211_SEC_CHAN_BELOW:
local->hw.conf.ht.enabled = true;
local->hw.conf.ht.sec_chan_offset = -1;
break;
case NL80211_SEC_CHAN_ABOVE:
local->hw.conf.ht.enabled = true;
local->hw.conf.ht.sec_chan_offset = 1;
break;
}
changed |= IEEE80211_CONF_CHANGE_CHANNEL;
}
if (!local->hw.conf.power_level)
power = chan->max_power;

1
net/mac80211/util.c
View File

@ -641,6 +641,7 @@ int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
chan->flags & IEEE80211_CHAN_NO_IBSS)
return ret;
local->oper_channel = chan;
local->oper_sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
if (local->sw_scanning || local->hw_scanning)
ret = 0;

57
net/wireless/nl80211.c
View File

@ -59,6 +59,8 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
.len = BUS_ID_SIZE-1 },
[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET] = { .type = NLA_U32 },
[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
@ -359,6 +361,61 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
}
}
if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
enum nl80211_sec_chan_offset sec_chan_offset =
NL80211_SEC_CHAN_NO_HT;
struct ieee80211_channel *chan;
u32 freq, sec_freq;
if (!rdev->ops->set_channel) {
result = -EOPNOTSUPP;
goto bad_res;
}
if (info->attrs[NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET]) {
sec_chan_offset = nla_get_u32(
info->attrs[
NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET]);
if (sec_chan_offset != NL80211_SEC_CHAN_NO_HT &&
sec_chan_offset != NL80211_SEC_CHAN_DISABLED &&
sec_chan_offset != NL80211_SEC_CHAN_BELOW &&
sec_chan_offset != NL80211_SEC_CHAN_ABOVE) {
result = -EINVAL;
goto bad_res;
}
}
freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
chan = ieee80211_get_channel(&rdev->wiphy, freq);
if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) {
/* Primary channel not allowed */
result = -EINVAL;
goto bad_res;
}
if (sec_chan_offset == NL80211_SEC_CHAN_BELOW)
sec_freq = freq - 20;
else if (sec_chan_offset == NL80211_SEC_CHAN_ABOVE)
sec_freq = freq + 20;
else
sec_freq = 0;
if (sec_freq) {
struct ieee80211_channel *schan;
schan = ieee80211_get_channel(&rdev->wiphy, sec_freq);
if (!schan || schan->flags & IEEE80211_CHAN_DISABLED) {
/* Secondary channel not allowed */
result = -EINVAL;
goto bad_res;
}
}
result = rdev->ops->set_channel(&rdev->wiphy, chan,
sec_chan_offset);
if (result)
goto bad_res;
}
bad_res:
cfg80211_put_dev(rdev);
return result;