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nl80211/cfg80211: extend mgmt-tx API for off-channel 

With p2p, it is sometimes necessary to transmit
a frame (typically an action frame) on another
channel than the current channel. Enable this
through the CMD_FRAME API, and allow it to wait
for a response. A new command allows that wait
to be aborted.

However, allow userspace to specify whether or
not it wants to allow off-channel TX, it may
actually want to use the same channel only.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-11-25 10:02:29 +01:00 committed by John W. Linville
parent 9a67d761b3
commit f7ca38dfe5
6 changed files with 91 additions and 22 deletions
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25
include/linux/nl80211.h
View File

@ -358,11 +358,16 @@
* user space application). %NL80211_ATTR_FRAME is used to specify the
* frame contents (including header). %NL80211_ATTR_WIPHY_FREQ (and
* optionally %NL80211_ATTR_WIPHY_CHANNEL_TYPE) is used to indicate on
* which channel the frame is to be transmitted or was received. This
* channel has to be the current channel (remain-on-channel or the
* operational channel). When called, this operation returns a cookie
* (%NL80211_ATTR_COOKIE) that will be included with the TX status event
* pertaining to the TX request.
* which channel the frame is to be transmitted or was received. If this
* channel is not the current channel (remain-on-channel or the
* operational channel) the device will switch to the given channel and
* transmit the frame, optionally waiting for a response for the time
* specified using %NL80211_ATTR_DURATION. When called, this operation
* returns a cookie (%NL80211_ATTR_COOKIE) that will be included with the
* TX status event pertaining to the TX request.
* @NL80211_CMD_FRAME_WAIT_CANCEL: When an off-channel TX was requested, this
* command may be used with the corresponding cookie to cancel the wait
* time if it is known that it is no longer necessary.
* @NL80211_CMD_ACTION: Alias for @NL80211_CMD_FRAME for backward compatibility.
* @NL80211_CMD_FRAME_TX_STATUS: Report TX status of a management frame
* transmitted with %NL80211_CMD_FRAME. %NL80211_ATTR_COOKIE identifies
@ -493,6 +498,8 @@ enum nl80211_commands {
NL80211_CMD_SET_CHANNEL,
NL80211_CMD_SET_WDS_PEER,
NL80211_CMD_FRAME_WAIT_CANCEL,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@ -828,6 +835,12 @@ enum nl80211_commands {
*
* @NL80211_ATTR_MCAST_RATE: Multicast tx rate (in 100 kbps) for IBSS
*
* @NL80211_ATTR_OFFCHANNEL_TX_OK: For management frame TX, the frame may be
* transmitted on another channel when the channel given doesn't match
* the current channel. If the current channel doesn't match and this
* flag isn't set, the frame will be rejected. This is also used as an
* nl80211 capability flag.
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@ -1002,6 +1015,8 @@ enum nl80211_attrs {
NL80211_ATTR_MCAST_RATE,
NL80211_ATTR_OFFCHANNEL_TX_OK,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,

11
include/net/cfg80211.h
View File

@ -1134,7 +1134,9 @@ struct cfg80211_pmksa {
* @cancel_remain_on_channel: Cancel an on-going remain-on-channel operation.
* This allows the operation to be terminated prior to timeout based on
* the duration value.
* @mgmt_tx: Transmit a management frame
* @mgmt_tx: Transmit a management frame.
* @mgmt_tx_cancel_wait: Cancel the wait time from transmitting a management
* frame on another channel
*
* @testmode_cmd: run a test mode command
*
@ -1291,10 +1293,13 @@ struct cfg80211_ops {
u64 cookie);
int (*mgmt_tx)(struct wiphy *wiphy, struct net_device *dev,
struct ieee80211_channel *chan,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, u64 *cookie);
int (*mgmt_tx_cancel_wait)(struct wiphy *wiphy,
struct net_device *dev,
u64 cookie);
int (*set_power_mgmt)(struct wiphy *wiphy, struct net_device *dev,
bool enabled, int timeout);

7
net/mac80211/cfg.c
View File

@ -1552,9 +1552,9 @@ static int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
}
static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
struct ieee80211_channel *chan,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, u64 *cookie)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@ -1565,6 +1565,9 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
u32 flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
IEEE80211_TX_CTL_REQ_TX_STATUS;
if (offchan)
return -EOPNOTSUPP;
/* Check that we are on the requested channel for transmission */
if (chan != local->tmp_channel &&
chan != local->oper_channel)

4
net/wireless/core.h
View File

@ -341,9 +341,9 @@ void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct ieee80211_channel *chan,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, u64 *cookie);
/* SME */

9
net/wireless/mlme.c
View File

@ -864,9 +864,9 @@ void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct ieee80211_channel *chan,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, u64 *cookie)
{
struct wireless_dev *wdev = dev->ieee80211_ptr;
@ -946,8 +946,9 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
return -EINVAL;
/* Transmit the Action frame as requested by user space */
return rdev->ops->mgmt_tx(&rdev->wiphy, dev, chan, channel_type,
channel_type_valid, buf, len, cookie);
return rdev->ops->mgmt_tx(&rdev->wiphy, dev, chan, offchan,
channel_type, channel_type_valid,
wait, buf, len, cookie);
}
bool cfg80211_rx_mgmt(struct net_device *dev, int freq, const u8 *buf,

57
net/wireless/nl80211.c
View File

@ -163,16 +163,13 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
[NL80211_ATTR_WIPHY_TX_POWER_SETTING] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] = { .type = NLA_U32 },
[NL80211_ATTR_FRAME_TYPE] = { .type = NLA_U16 },
[NL80211_ATTR_WIPHY_ANTENNA_TX] = { .type = NLA_U32 },
[NL80211_ATTR_WIPHY_ANTENNA_RX] = { .type = NLA_U32 },
[NL80211_ATTR_MCAST_RATE] = { .type = NLA_U32 },
[NL80211_ATTR_OFFCHANNEL_TX_OK] = { .type = NLA_FLAG },
};
/* policy for the key attributes */
@ -677,6 +674,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
CMD(remain_on_channel, REMAIN_ON_CHANNEL);
CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
CMD(mgmt_tx, FRAME);
CMD(mgmt_tx_cancel_wait, FRAME_WAIT_CANCEL);
if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
i++;
NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
@ -698,6 +696,10 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
nla_nest_end(msg, nl_cmds);
/* for now at least assume all drivers have it */
if (dev->ops->mgmt_tx)
NLA_PUT_FLAG(msg, NL80211_ATTR_OFFCHANNEL_TX_OK);
if (mgmt_stypes) {
u16 stypes;
struct nlattr *nl_ftypes, *nl_ifs;
@ -4244,6 +4246,8 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
void *hdr;
u64 cookie;
struct sk_buff *msg;
unsigned int wait = 0;
bool offchan;
if (!info->attrs[NL80211_ATTR_FRAME] ||
!info->attrs[NL80211_ATTR_WIPHY_FREQ])
@ -4260,6 +4264,12 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
return -EOPNOTSUPP;
if (info->attrs[NL80211_ATTR_DURATION]) {
if (!rdev->ops->mgmt_tx_cancel_wait)
return -EINVAL;
wait = nla_get_u32(info->attrs[NL80211_ATTR_DURATION]);
}
if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
channel_type = nla_get_u32(
info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
@ -4271,6 +4281,8 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
channel_type_valid = true;
}
offchan = info->attrs[NL80211_ATTR_OFFCHANNEL_TX_OK];
freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
chan = rdev_freq_to_chan(rdev, freq, channel_type);
if (chan == NULL)
@ -4287,8 +4299,8 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
err = PTR_ERR(hdr);
goto free_msg;
}
err = cfg80211_mlme_mgmt_tx(rdev, dev, chan, channel_type,
channel_type_valid,
err = cfg80211_mlme_mgmt_tx(rdev, dev, chan, offchan, channel_type,
channel_type_valid, wait,
nla_data(info->attrs[NL80211_ATTR_FRAME]),
nla_len(info->attrs[NL80211_ATTR_FRAME]),
&cookie);
@ -4307,6 +4319,31 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
return err;
}
static int nl80211_tx_mgmt_cancel_wait(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
u64 cookie;
if (!info->attrs[NL80211_ATTR_COOKIE])
return -EINVAL;
if (!rdev->ops->mgmt_tx_cancel_wait)
return -EOPNOTSUPP;
if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_ADHOC &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_CLIENT &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP_VLAN &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
return -EOPNOTSUPP;
cookie = nla_get_u64(info->attrs[NL80211_ATTR_COOKIE]);
return rdev->ops->mgmt_tx_cancel_wait(&rdev->wiphy, dev, cookie);
}
static int nl80211_set_power_save(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@ -4879,6 +4916,14 @@ static struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_FRAME_WAIT_CANCEL,
.doit = nl80211_tx_mgmt_cancel_wait,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_SET_POWER_SAVE,
.doit = nl80211_set_power_save,