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mac80211: introduce TDLS channel switch ops

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Implement the cfg80211 TDLS channel switch ops and introduce new mac80211
ones for low-level drivers.
Verify low-level driver support for the new ops when using the relevant
wiphy feature bit. Also verify the peer supports channel switching before
passing the command down.

Add a new STA flag to track the off-channel state with the TDLS peer and
make sure to cancel the channel-switch if the peer STA is unexpectedly
removed.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arik Nemtsov 2014-11-09 18:50:19 +02:00 committed by Johannes Berg
parent 5383758443
commit a7a6bdd067
10 changed files with 381 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/net/mac80211.h
View File

@ -2915,6 +2915,16 @@ enum ieee80211_reconfig_type {
*
* @get_txpower: get current maximum tx power (in dBm) based on configuration
* and hardware limits.
*
* @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver
* is responsible for continually initiating channel-switching operations
* and returning to the base channel for communication with the AP. The
* driver receives a channel-switch request template and the location of
* the switch-timing IE within the template as part of the invocation.
* The template is valid only within the call, and the driver can
* optionally copy the skb for further re-use.
* @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
* peers must be on the base channel when the call completes.
*/
struct ieee80211_ops {
void (*tx)(struct ieee80211_hw *hw,
@ -3126,6 +3136,15 @@ struct ieee80211_ops {
u32 (*get_expected_throughput)(struct ieee80211_sta *sta);
int (*get_txpower)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
int *dbm);
int (*tdls_channel_switch)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u8 oper_class,
struct cfg80211_chan_def *chandef,
struct sk_buff *skb, u32 ch_sw_tm_ie);
void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
};
/**

2
net/mac80211/cfg.c
View File

@ -3752,6 +3752,8 @@ const struct cfg80211_ops mac80211_config_ops = {
.set_rekey_data = ieee80211_set_rekey_data,
.tdls_oper = ieee80211_tdls_oper,
.tdls_mgmt = ieee80211_tdls_mgmt,
.tdls_channel_switch = ieee80211_tdls_channel_switch,
.tdls_cancel_channel_switch = ieee80211_tdls_cancel_channel_switch,
.probe_client = ieee80211_probe_client,
.set_noack_map = ieee80211_set_noack_map,
#ifdef CONFIG_PM

10
net/mac80211/debugfs_sta.c
View File

@ -74,7 +74,7 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""
int res = scnprintf(buf, sizeof(buf),
"%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
"%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
TEST(AUTH), TEST(ASSOC), TEST(PS_STA),
TEST(PS_DRIVER), TEST(AUTHORIZED),
TEST(SHORT_PREAMBLE),
@ -83,10 +83,10 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),
TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),
TEST(TDLS_PEER_AUTH), TEST(TDLS_INITIATOR),
TEST(TDLS_CHAN_SWITCH), TEST(4ADDR_EVENT),
TEST(INSERTED), TEST(RATE_CONTROL),
TEST(TOFFSET_KNOWN), TEST(MPSP_OWNER),
TEST(MPSP_RECIPIENT));
TEST(TDLS_CHAN_SWITCH), TEST(TDLS_OFF_CHANNEL),
TEST(4ADDR_EVENT), TEST(INSERTED),
TEST(RATE_CONTROL), TEST(TOFFSET_KNOWN),
TEST(MPSP_OWNER), TEST(MPSP_RECIPIENT));
#undef TEST
return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}

41
net/mac80211/driver-ops.h
View File

@ -1296,4 +1296,45 @@ static inline int drv_get_txpower(struct ieee80211_local *local,
return ret;
}
static inline int
drv_tdls_channel_switch(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta, u8 oper_class,
struct cfg80211_chan_def *chandef,
struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
{
int ret;
might_sleep();
if (!check_sdata_in_driver(sdata))
return -EIO;
if (!local->ops->tdls_channel_switch)
return -EOPNOTSUPP;
trace_drv_tdls_channel_switch(local, sdata, sta, oper_class, chandef);
ret = local->ops->tdls_channel_switch(&local->hw, &sdata->vif, sta,
oper_class, chandef, tmpl_skb,
ch_sw_tm_ie);
trace_drv_return_int(local, ret);
return ret;
}
static inline void
drv_tdls_cancel_channel_switch(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta)
{
might_sleep();
if (!check_sdata_in_driver(sdata))
return;
if (!local->ops->tdls_cancel_channel_switch)
return;
trace_drv_tdls_cancel_channel_switch(local, sdata, sta);
local->ops->tdls_cancel_channel_switch(&local->hw, &sdata->vif, sta);
trace_drv_return_void(local);
}
#endif /* __MAC80211_DRIVER_OPS */

6
net/mac80211/ieee80211_i.h
View File

@ -2007,6 +2007,12 @@ int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
const u8 *peer, enum nl80211_tdls_operation oper);
void ieee80211_tdls_peer_del_work(struct work_struct *wk);
int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
const u8 *addr, u8 oper_class,
struct cfg80211_chan_def *chandef);
void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
struct net_device *dev,
const u8 *addr);
extern const struct ethtool_ops ieee80211_ethtool_ops;

5
net/mac80211/main.c
View File

@ -764,6 +764,11 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
local->hw.offchannel_tx_hw_queue >= local->hw.queues))
return -EINVAL;
if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
(!local->ops->tdls_channel_switch ||
!local->ops->tdls_cancel_channel_switch))
return -EOPNOTSUPP;
#ifdef CONFIG_PM
if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
return -EINVAL;

9
net/mac80211/sta_info.c
View File

@ -847,6 +847,15 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
if (WARN_ON(ret))
return ret;
/*
* for TDLS peers, make sure to return to the base channel before
* removal.
*/
if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
}
list_del_rcu(&sta->list);
drv_sta_pre_rcu_remove(local, sta->sdata, sta);

3
net/mac80211/sta_info.h
View File

@ -50,6 +50,8 @@
* @WLAN_STA_TDLS_INITIATOR: We are the initiator of the TDLS link with this
* station.
* @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
* @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
* TDLS peer
* @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
* keeping station in power-save mode, reply when the driver
* unblocks the station.
@ -80,6 +82,7 @@ enum ieee80211_sta_info_flags {
WLAN_STA_TDLS_PEER_AUTH,
WLAN_STA_TDLS_INITIATOR,
WLAN_STA_TDLS_CHAN_SWITCH,
WLAN_STA_TDLS_OFF_CHANNEL,
WLAN_STA_UAPSD,
WLAN_STA_SP,
WLAN_STA_4ADDR_EVENT,

234
net/mac80211/tdls.c
View File

@ -449,6 +449,48 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
}
static void
ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
bool initiator, const u8 *extra_ies,
size_t extra_ies_len, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_tdls_data *tf;
size_t offset = 0, noffset;
u8 *pos;
if (WARN_ON_ONCE(!chandef))
return;
tf = (void *)skb->data;
tf->u.chan_switch_req.target_channel =
ieee80211_frequency_to_channel(chandef->chan->center_freq);
tf->u.chan_switch_req.oper_class = oper_class;
if (extra_ies_len) {
static const u8 before_lnkie[] = {
WLAN_EID_SECONDARY_CHANNEL_OFFSET,
};
noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
before_lnkie,
ARRAY_SIZE(before_lnkie),
offset);
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
offset = noffset;
}
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
/* add any remaining IEs */
if (extra_ies_len) {
noffset = extra_ies_len;
pos = skb_put(skb, noffset - offset);
memcpy(pos, extra_ies + offset, noffset - offset);
}
}
static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, const u8 *peer,
u8 action_code, u16 status_code,
@ -481,6 +523,12 @@ static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
break;
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
initiator, extra_ies,
extra_ies_len,
oper_class, chandef);
break;
}
}
@ -547,6 +595,12 @@ ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
skb_put(skb, sizeof(tf->u.discover_req));
tf->u.discover_req.dialog_token = dialog_token;
break;
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
tf->category = WLAN_CATEGORY_TDLS;
tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
skb_put(skb, sizeof(tf->u.chan_switch_req));
break;
default:
return -EINVAL;
}
@ -626,6 +680,7 @@ ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
case WLAN_TDLS_SETUP_CONFIRM:
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_DISCOVERY_REQUEST:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
sdata->dev, peer,
action_code, dialog_token,
@ -699,6 +754,7 @@ ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
initiator = false;
break;
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
/* any value is ok */
break;
default:
@ -1046,3 +1102,181 @@ void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
}
EXPORT_SYMBOL(ieee80211_tdls_oper_request);
static void
iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
{
struct ieee80211_ch_switch_timing *ch_sw;
*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
*buf++ = sizeof(struct ieee80211_ch_switch_timing);
ch_sw = (void *)buf;
ch_sw->switch_time = cpu_to_le16(switch_time);
ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
}
/* find switch timing IE in SKB ready for Tx */
static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
{
struct ieee80211_tdls_data *tf;
const u8 *ie_start;
/*
* Get the offset for the new location of the switch timing IE.
* The SKB network header will now point to the "payload_type"
* element of the TDLS data frame struct.
*/
tf = container_of(skb->data + skb_network_offset(skb),
struct ieee80211_tdls_data, payload_type);
ie_start = tf->u.chan_switch_req.variable;
return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
skb->len - (ie_start - skb->data));
}
static struct sk_buff *
ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
struct cfg80211_chan_def *chandef,
u32 *ch_sw_tm_ie_offset)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
2 + sizeof(struct ieee80211_ch_switch_timing)];
int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
u8 *pos = extra_ies;
struct sk_buff *skb;
/*
* if chandef points to a wide channel add a Secondary-Channel
* Offset information element
*/
if (chandef->width == NL80211_CHAN_WIDTH_40) {
struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
bool ht40plus;
*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
*pos++ = sizeof(*sec_chan_ie);
sec_chan_ie = (void *)pos;
ht40plus = cfg80211_get_chandef_type(chandef) ==
NL80211_CHAN_HT40PLUS;
sec_chan_ie->sec_chan_offs = ht40plus ?
IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
IEEE80211_HT_PARAM_CHA_SEC_BELOW;
pos += sizeof(*sec_chan_ie);
extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
}
/* just set the values to 0, this is a template */
iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
0, 0, !sta->sta.tdls_initiator,
extra_ies, extra_ies_len,
oper_class, chandef);
if (!skb)
return NULL;
skb = ieee80211_build_data_template(sdata, skb, 0);
if (IS_ERR(skb)) {
tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
return NULL;
}
if (ch_sw_tm_ie_offset) {
const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
if (!tm_ie) {
tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
dev_kfree_skb_any(skb);
return NULL;
}
*ch_sw_tm_ie_offset = tm_ie - skb->data;
}
tdls_dbg(sdata,
"TDLS channel switch request template for %pM ch %d width %d\n",
sta->sta.addr, chandef->chan->center_freq, chandef->width);
return skb;
}
int
ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
const u8 *addr, u8 oper_class,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
struct sk_buff *skb = NULL;
u32 ch_sw_tm_ie;
int ret;
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, addr);
if (!sta) {
tdls_dbg(sdata,
"Invalid TDLS peer %pM for channel switch request\n",
addr);
ret = -ENOENT;
goto out;
}
if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) {
tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n",
addr);
ret = -ENOTSUPP;
goto out;
}
skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef,
&ch_sw_tm_ie);
if (!skb) {
ret = -ENOENT;
goto out;
}
ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class,
chandef, skb, ch_sw_tm_ie);
if (!ret)
set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
out:
mutex_unlock(&local->sta_mtx);
dev_kfree_skb_any(skb);
return ret;
}
void
ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
struct net_device *dev,
const u8 *addr)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
mutex_lock(&local->sta_mtx);
sta = sta_info_get(sdata, addr);
if (!sta) {
tdls_dbg(sdata,
"Invalid TDLS peer %pM for channel switch cancel\n",
addr);
goto out;
}
if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n",
addr);
goto out;
}
drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
out:
mutex_unlock(&local->sta_mtx);
}

57
net/mac80211/trace.h
View File

@ -2196,6 +2196,63 @@ TRACE_EVENT(drv_get_txpower,
)
);
TRACE_EVENT(drv_tdls_channel_switch,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta, u8 oper_class,
struct cfg80211_chan_def *chandef),
TP_ARGS(local, sdata, sta, oper_class, chandef),
TP_STRUCT__entry(
LOCAL_ENTRY
VIF_ENTRY
STA_ENTRY
__field(u8, oper_class)
CHANDEF_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
VIF_ASSIGN;
STA_ASSIGN;
__entry->oper_class = oper_class;
CHANDEF_ASSIGN(chandef)
),
TP_printk(
LOCAL_PR_FMT VIF_PR_FMT " tdls channel switch to"
CHANDEF_PR_FMT " oper_class:%d " STA_PR_FMT,
LOCAL_PR_ARG, VIF_PR_ARG, CHANDEF_PR_ARG, __entry->oper_class,
STA_PR_ARG
)
);
TRACE_EVENT(drv_tdls_cancel_channel_switch,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta),
TP_ARGS(local, sdata, sta),
TP_STRUCT__entry(
LOCAL_ENTRY
VIF_ENTRY
STA_ENTRY
),
TP_fast_assign(
LOCAL_ASSIGN;
VIF_ASSIGN;
STA_ASSIGN;
),
TP_printk(
LOCAL_PR_FMT VIF_PR_FMT
" tdls cancel channel switch with " STA_PR_FMT,
LOCAL_PR_ARG, VIF_PR_ARG, STA_PR_ARG
)
);
#ifdef CONFIG_MAC80211_MESSAGE_TRACING
#undef TRACE_SYSTEM