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cfg80211/nl80211: station handling

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This patch adds station handling to cfg80211/nl80211.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-12-19 02:03:34 +01:00 committed by David S. Miller
parent ed1b6cc7f8
commit 5727ef1b2e
3 changed files with 358 additions and 0 deletions
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68
include/linux/nl80211.h
View file

@ -6,6 +6,18 @@
* Copyright 2006, 2007 Johannes Berg <johannes@sipsolutions.net>
*/
/**
* DOC: Station handling
*
* Stations are added per interface, but a special case exists with VLAN
* interfaces. When a station is bound to an AP interface, it may be moved
* into a VLAN identified by a VLAN interface index (%NL80211_ATTR_STA_VLAN).
* The station is still assumed to belong to the AP interface it was added
* to.
*
* TODO: need more info?
*/
/**
* enum nl80211_commands - supported nl80211 commands
*
@ -56,6 +68,16 @@
* parameters are like for %NL80211_CMD_SET_BEACON.
* @NL80211_CMD_DEL_BEACON: remove the beacon, stop sending it
*
* @NL80211_CMD_GET_STATION: Get station attributes for station identified by
* %NL80211_ATTR_MAC on the interface identified by %NL80211_ATTR_IFINDEX.
* @NL80211_CMD_SET_STATION: Set station attributes for station identified by
* %NL80211_ATTR_MAC on the interface identified by %NL80211_ATTR_IFINDEX.
* @NL80211_CMD_NEW_STATION: Add a station with given attributes to the
* the interface identified by %NL80211_ATTR_IFINDEX.
* @NL80211_CMD_DEL_STATION: Remove a station identified by %NL80211_ATTR_MAC
* or, if no MAC address given, all stations, on the interface identified
* by %NL80211_ATTR_IFINDEX.
*
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@ -83,6 +105,11 @@ enum nl80211_commands {
NL80211_CMD_NEW_BEACON,
NL80211_CMD_DEL_BEACON,
NL80211_CMD_GET_STATION,
NL80211_CMD_SET_STATION,
NL80211_CMD_NEW_STATION,
NL80211_CMD_DEL_STATION,
/* add commands here */
/* used to define NL80211_CMD_MAX below */
@ -120,6 +147,17 @@ enum nl80211_commands {
* @NL80211_ATTR_BEACON_HEAD: portion of the beacon before the TIM IE
* @NL80211_ATTR_BEACON_TAIL: portion of the beacon after the TIM IE
*
* @NL80211_ATTR_STA_AID: Association ID for the station (u16)
* @NL80211_ATTR_STA_FLAGS: flags, nested element with NLA_FLAG attributes of
* &enum nl80211_sta_flags.
* @NL80211_ATTR_STA_LISTEN_INTERVAL: listen interval as defined by
* IEEE 802.11 7.3.1.6 (u16).
* @NL80211_ATTR_STA_SUPPORTED_RATES: supported rates, array of supported
* rates as defined by IEEE 802.11 7.3.2.2 but without the length
* restriction (at most %NL80211_MAX_SUPP_RATES).
* @NL80211_ATTR_STA_VLAN: interface index of VLAN interface to move station
* to, or the AP interface the station was originally added to to.
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@ -147,12 +185,20 @@ enum nl80211_attrs {
NL80211_ATTR_BEACON_HEAD,
NL80211_ATTR_BEACON_TAIL,
NL80211_ATTR_STA_AID,
NL80211_ATTR_STA_FLAGS,
NL80211_ATTR_STA_LISTEN_INTERVAL,
NL80211_ATTR_STA_SUPPORTED_RATES,
NL80211_ATTR_STA_VLAN,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
NL80211_ATTR_MAX = __NL80211_ATTR_AFTER_LAST - 1
};
#define NL80211_MAX_SUPP_RATES 32
/**
* enum nl80211_iftype - (virtual) interface types
*
@ -184,4 +230,26 @@ enum nl80211_iftype {
NL80211_IFTYPE_MAX = __NL80211_IFTYPE_AFTER_LAST - 1
};
/**
* enum nl80211_sta_flags - station flags
*
* Station flags. When a station is added to an AP interface, it is
* assumed to be already associated (and hence authenticated.)
*
* @NL80211_STA_FLAG_AUTHORIZED: station is authorized (802.1X)
* @NL80211_STA_FLAG_SHORT_PREAMBLE: station is capable of receiving frames
* with short barker preamble
* @NL80211_STA_FLAG_WME: station is WME/QoS capable
*/
enum nl80211_sta_flags {
__NL80211_STA_FLAG_INVALID,
NL80211_STA_FLAG_AUTHORIZED,
NL80211_STA_FLAG_SHORT_PREAMBLE,
NL80211_STA_FLAG_WME,
/* keep last */
__NL80211_STA_FLAG_AFTER_LAST,
NL80211_STA_FLAG_MAX = __NL80211_STA_FLAG_AFTER_LAST - 1
};
#endif /* __LINUX_NL80211_H */

55
include/net/cfg80211.h
View file

@ -89,6 +89,47 @@ struct beacon_parameters {
int head_len, tail_len;
};
/**
* enum station_flags - station flags
*
* Station capability flags. Note that these must be the bits
* according to the nl80211 flags.
*
* @STATION_FLAG_CHANGED: station flags were changed
* @STATION_FLAG_AUTHORIZED: station is authorized to send frames (802.1X)
* @STATION_FLAG_SHORT_PREAMBLE: station is capable of receiving frames
* with short preambles
* @STATION_FLAG_WME: station is WME/QoS capable
*/
enum station_flags {
STATION_FLAG_CHANGED = 1<<0,
STATION_FLAG_AUTHORIZED = 1<<NL80211_STA_FLAG_AUTHORIZED,
STATION_FLAG_SHORT_PREAMBLE = 1<<NL80211_STA_FLAG_SHORT_PREAMBLE,
STATION_FLAG_WME = 1<<NL80211_STA_FLAG_WME,
};
/**
* struct station_parameters - station parameters
*
* Used to change and create a new station.
*
* @vlan: vlan interface station should belong to
* @supported_rates: supported rates in IEEE 802.11 format
* (or NULL for no change)
* @supported_rates_len: number of supported rates
* @station_flags: station flags (see &enum station_flags)
* @listen_interval: listen interval or -1 for no change
* @aid: AID or zero for no change
*/
struct station_parameters {
u8 *supported_rates;
struct net_device *vlan;
u32 station_flags;
int listen_interval;
u16 aid;
u8 supported_rates_len;
};
/* from net/wireless.h */
struct wiphy;
@ -130,6 +171,12 @@ struct wiphy;
* interface. This should reject the call when no beacon has been
* configured.
* @del_beacon: Remove beacon configuration and stop sending the beacon.
*
* @add_station: Add a new station.
*
* @del_station: Remove a station; @mac may be NULL to remove all stations.
*
* @change_station: Modify a given station.
*/
struct cfg80211_ops {
int (*add_virtual_intf)(struct wiphy *wiphy, char *name,
@ -155,6 +202,14 @@ struct cfg80211_ops {
int (*set_beacon)(struct wiphy *wiphy, struct net_device *dev,
struct beacon_parameters *info);
int (*del_beacon)(struct wiphy *wiphy, struct net_device *dev);
int (*add_station)(struct wiphy *wiphy, struct net_device *dev,
u8 *mac, struct station_parameters *params);
int (*del_station)(struct wiphy *wiphy, struct net_device *dev,
u8 *mac);
int (*change_station)(struct wiphy *wiphy, struct net_device *dev,
u8 *mac, struct station_parameters *params);
};
#endif /* __NET_CFG80211_H */

235
net/wireless/nl80211.c
View file

@ -76,6 +76,12 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_BEACON_TAIL] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_STA_AID] = { .type = NLA_U16 },
[NL80211_ATTR_STA_FLAGS] = { .type = NLA_NESTED },
[NL80211_ATTR_STA_LISTEN_INTERVAL] = { .type = NLA_U16 },
[NL80211_ATTR_STA_SUPPORTED_RATES] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_RATES },
[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
};
/* message building helper */
@ -715,6 +721,210 @@ static int nl80211_del_beacon(struct sk_buff *skb, struct genl_info *info)
return err;
}
static const struct nla_policy sta_flags_policy[NL80211_STA_FLAG_MAX + 1] = {
[NL80211_STA_FLAG_AUTHORIZED] = { .type = NLA_FLAG },
[NL80211_STA_FLAG_SHORT_PREAMBLE] = { .type = NLA_FLAG },
[NL80211_STA_FLAG_WME] = { .type = NLA_FLAG },
};
static int parse_station_flags(struct nlattr *nla, u32 *staflags)
{
struct nlattr *flags[NL80211_STA_FLAG_MAX + 1];
int flag;
*staflags = 0;
if (!nla)
return 0;
if (nla_parse_nested(flags, NL80211_STA_FLAG_MAX,
nla, sta_flags_policy))
return -EINVAL;
*staflags = STATION_FLAG_CHANGED;
for (flag = 1; flag <= NL80211_STA_FLAG_MAX; flag++)
if (flags[flag])
*staflags |= (1<<flag);
return 0;
}
static int nl80211_get_station(struct sk_buff *skb, struct genl_info *info)
{
return -EOPNOTSUPP;
}
/*
* Get vlan interface making sure it is on the right wiphy.
*/
static int get_vlan(struct nlattr *vlanattr,
struct cfg80211_registered_device *rdev,
struct net_device **vlan)
{
*vlan = NULL;
if (vlanattr) {
*vlan = dev_get_by_index(&init_net, nla_get_u32(vlanattr));
if (!*vlan)
return -ENODEV;
if (!(*vlan)->ieee80211_ptr)
return -EINVAL;
if ((*vlan)->ieee80211_ptr->wiphy != &rdev->wiphy)
return -EINVAL;
}
return 0;
}
static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *drv;
int err;
struct net_device *dev;
struct station_parameters params;
u8 *mac_addr = NULL;
memset(&params, 0, sizeof(params));
params.listen_interval = -1;
if (info->attrs[NL80211_ATTR_STA_AID])
return -EINVAL;
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
if (info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]) {
params.supported_rates =
nla_data(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
params.supported_rates_len =
nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
}
if (info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL])
params.listen_interval =
nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
if (parse_station_flags(info->attrs[NL80211_ATTR_STA_FLAGS],
&params.station_flags))
return -EINVAL;
err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
if (err)
return err;
err = get_vlan(info->attrs[NL80211_ATTR_STA_VLAN], drv, &params.vlan);
if (err)
goto out;
if (!drv->ops->change_station) {
err = -EOPNOTSUPP;
goto out;
}
rtnl_lock();
err = drv->ops->change_station(&drv->wiphy, dev, mac_addr, &params);
rtnl_unlock();
out:
if (params.vlan)
dev_put(params.vlan);
cfg80211_put_dev(drv);
dev_put(dev);
return err;
}
static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *drv;
int err;
struct net_device *dev;
struct station_parameters params;
u8 *mac_addr = NULL;
memset(&params, 0, sizeof(params));
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
if (!info->attrs[NL80211_ATTR_STA_AID])
return -EINVAL;
if (!info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL])
return -EINVAL;
if (!info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES])
return -EINVAL;
mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
params.supported_rates =
nla_data(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
params.supported_rates_len =
nla_len(info->attrs[NL80211_ATTR_STA_SUPPORTED_RATES]);
params.listen_interval =
nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
params.listen_interval = nla_get_u16(info->attrs[NL80211_ATTR_STA_AID]);
if (parse_station_flags(info->attrs[NL80211_ATTR_STA_FLAGS],
&params.station_flags))
return -EINVAL;
err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
if (err)
return err;
err = get_vlan(info->attrs[NL80211_ATTR_STA_VLAN], drv, &params.vlan);
if (err)
goto out;
if (!drv->ops->add_station) {
err = -EOPNOTSUPP;
goto out;
}
rtnl_lock();
err = drv->ops->add_station(&drv->wiphy, dev, mac_addr, &params);
rtnl_unlock();
out:
if (params.vlan)
dev_put(params.vlan);
cfg80211_put_dev(drv);
dev_put(dev);
return err;
}
static int nl80211_del_station(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *drv;
int err;
struct net_device *dev;
u8 *mac_addr = NULL;
if (info->attrs[NL80211_ATTR_MAC])
mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
if (err)
return err;
if (!drv->ops->del_station) {
err = -EOPNOTSUPP;
goto out;
}
rtnl_lock();
err = drv->ops->del_station(&drv->wiphy, dev, mac_addr);
rtnl_unlock();
out:
cfg80211_put_dev(drv);
dev_put(dev);
return err;
}
static struct genl_ops nl80211_ops[] = {
{
.cmd = NL80211_CMD_GET_WIPHY,
@ -796,6 +1006,31 @@ static struct genl_ops nl80211_ops[] = {
.flags = GENL_ADMIN_PERM,
.doit = nl80211_del_beacon,
},
{
.cmd = NL80211_CMD_GET_STATION,
.doit = nl80211_get_station,
/* TODO: implement dumpit */
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NL80211_CMD_SET_STATION,
.doit = nl80211_set_station,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NL80211_CMD_NEW_STATION,
.doit = nl80211_new_station,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NL80211_CMD_DEL_STATION,
.doit = nl80211_del_station,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
};
/* multicast groups */