mac80211: introduce TDLS channel switch ops
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:
Родитель
5383758443
Коммит
a7a6bdd067
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@ -2915,6 +2915,16 @@ enum ieee80211_reconfig_type {
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*
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* @get_txpower: get current maximum tx power (in dBm) based on configuration
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* and hardware limits.
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*
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* @tdls_channel_switch: Start channel-switching with a TDLS peer. The driver
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* is responsible for continually initiating channel-switching operations
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* and returning to the base channel for communication with the AP. The
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* driver receives a channel-switch request template and the location of
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* the switch-timing IE within the template as part of the invocation.
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* The template is valid only within the call, and the driver can
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* optionally copy the skb for further re-use.
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* @tdls_cancel_channel_switch: Stop channel-switching with a TDLS peer. Both
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* peers must be on the base channel when the call completes.
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*/
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struct ieee80211_ops {
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void (*tx)(struct ieee80211_hw *hw,
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@ -3126,6 +3136,15 @@ struct ieee80211_ops {
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u32 (*get_expected_throughput)(struct ieee80211_sta *sta);
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int (*get_txpower)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
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int *dbm);
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int (*tdls_channel_switch)(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta, u8 oper_class,
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struct cfg80211_chan_def *chandef,
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struct sk_buff *skb, u32 ch_sw_tm_ie);
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void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct ieee80211_sta *sta);
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};
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/**
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@ -3752,6 +3752,8 @@ const struct cfg80211_ops mac80211_config_ops = {
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.set_rekey_data = ieee80211_set_rekey_data,
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.tdls_oper = ieee80211_tdls_oper,
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.tdls_mgmt = ieee80211_tdls_mgmt,
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.tdls_channel_switch = ieee80211_tdls_channel_switch,
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.tdls_cancel_channel_switch = ieee80211_tdls_cancel_channel_switch,
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.probe_client = ieee80211_probe_client,
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.set_noack_map = ieee80211_set_noack_map,
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#ifdef CONFIG_PM
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@ -74,7 +74,7 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
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test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""
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int res = scnprintf(buf, sizeof(buf),
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"%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
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"%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",
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TEST(AUTH), TEST(ASSOC), TEST(PS_STA),
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TEST(PS_DRIVER), TEST(AUTHORIZED),
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TEST(SHORT_PREAMBLE),
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@ -83,10 +83,10 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
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TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),
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TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),
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TEST(TDLS_PEER_AUTH), TEST(TDLS_INITIATOR),
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TEST(TDLS_CHAN_SWITCH), TEST(4ADDR_EVENT),
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TEST(INSERTED), TEST(RATE_CONTROL),
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TEST(TOFFSET_KNOWN), TEST(MPSP_OWNER),
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TEST(MPSP_RECIPIENT));
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TEST(TDLS_CHAN_SWITCH), TEST(TDLS_OFF_CHANNEL),
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TEST(4ADDR_EVENT), TEST(INSERTED),
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TEST(RATE_CONTROL), TEST(TOFFSET_KNOWN),
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TEST(MPSP_OWNER), TEST(MPSP_RECIPIENT));
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#undef TEST
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return simple_read_from_buffer(userbuf, count, ppos, buf, res);
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}
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@ -1296,4 +1296,45 @@ static inline int drv_get_txpower(struct ieee80211_local *local,
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return ret;
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}
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static inline int
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drv_tdls_channel_switch(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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struct ieee80211_sta *sta, u8 oper_class,
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struct cfg80211_chan_def *chandef,
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struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
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{
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int ret;
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might_sleep();
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if (!check_sdata_in_driver(sdata))
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return -EIO;
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if (!local->ops->tdls_channel_switch)
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return -EOPNOTSUPP;
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trace_drv_tdls_channel_switch(local, sdata, sta, oper_class, chandef);
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ret = local->ops->tdls_channel_switch(&local->hw, &sdata->vif, sta,
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oper_class, chandef, tmpl_skb,
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ch_sw_tm_ie);
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trace_drv_return_int(local, ret);
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return ret;
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}
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static inline void
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drv_tdls_cancel_channel_switch(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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struct ieee80211_sta *sta)
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{
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might_sleep();
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if (!check_sdata_in_driver(sdata))
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return;
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if (!local->ops->tdls_cancel_channel_switch)
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return;
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trace_drv_tdls_cancel_channel_switch(local, sdata, sta);
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local->ops->tdls_cancel_channel_switch(&local->hw, &sdata->vif, sta);
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trace_drv_return_void(local);
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}
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#endif /* __MAC80211_DRIVER_OPS */
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@ -2007,6 +2007,12 @@ int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
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int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
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const u8 *peer, enum nl80211_tdls_operation oper);
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void ieee80211_tdls_peer_del_work(struct work_struct *wk);
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int ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
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const u8 *addr, u8 oper_class,
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struct cfg80211_chan_def *chandef);
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void ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy,
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struct net_device *dev,
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const u8 *addr);
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extern const struct ethtool_ops ieee80211_ethtool_ops;
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@ -764,6 +764,11 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
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local->hw.offchannel_tx_hw_queue >= local->hw.queues))
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return -EINVAL;
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if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
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(!local->ops->tdls_channel_switch ||
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!local->ops->tdls_cancel_channel_switch))
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return -EOPNOTSUPP;
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#ifdef CONFIG_PM
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if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))
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return -EINVAL;
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@ -847,6 +847,15 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
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if (WARN_ON(ret))
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return ret;
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/*
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* for TDLS peers, make sure to return to the base channel before
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* removal.
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*/
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if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
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drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
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clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
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}
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list_del_rcu(&sta->list);
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drv_sta_pre_rcu_remove(local, sta->sdata, sta);
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@ -50,6 +50,8 @@
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* @WLAN_STA_TDLS_INITIATOR: We are the initiator of the TDLS link with this
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* station.
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* @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
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* @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
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* TDLS peer
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* @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
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* keeping station in power-save mode, reply when the driver
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* unblocks the station.
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@ -80,6 +82,7 @@ enum ieee80211_sta_info_flags {
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WLAN_STA_TDLS_PEER_AUTH,
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WLAN_STA_TDLS_INITIATOR,
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WLAN_STA_TDLS_CHAN_SWITCH,
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WLAN_STA_TDLS_OFF_CHANNEL,
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WLAN_STA_UAPSD,
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WLAN_STA_SP,
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WLAN_STA_4ADDR_EVENT,
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@ -449,6 +449,48 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
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ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
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}
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static void
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ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb, const u8 *peer,
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bool initiator, const u8 *extra_ies,
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size_t extra_ies_len, u8 oper_class,
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struct cfg80211_chan_def *chandef)
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{
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struct ieee80211_tdls_data *tf;
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size_t offset = 0, noffset;
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u8 *pos;
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if (WARN_ON_ONCE(!chandef))
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return;
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tf = (void *)skb->data;
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tf->u.chan_switch_req.target_channel =
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ieee80211_frequency_to_channel(chandef->chan->center_freq);
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tf->u.chan_switch_req.oper_class = oper_class;
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if (extra_ies_len) {
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static const u8 before_lnkie[] = {
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WLAN_EID_SECONDARY_CHANNEL_OFFSET,
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};
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noffset = ieee80211_ie_split(extra_ies, extra_ies_len,
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before_lnkie,
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ARRAY_SIZE(before_lnkie),
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offset);
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pos = skb_put(skb, noffset - offset);
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memcpy(pos, extra_ies + offset, noffset - offset);
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offset = noffset;
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}
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ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
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/* add any remaining IEs */
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if (extra_ies_len) {
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noffset = extra_ies_len;
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pos = skb_put(skb, noffset - offset);
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memcpy(pos, extra_ies + offset, noffset - offset);
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}
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}
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static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb, const u8 *peer,
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u8 action_code, u16 status_code,
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@ -481,6 +523,12 @@ static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata,
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if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN)
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ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
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break;
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case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
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ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer,
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initiator, extra_ies,
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extra_ies_len,
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oper_class, chandef);
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break;
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}
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}
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@ -547,6 +595,12 @@ ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
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skb_put(skb, sizeof(tf->u.discover_req));
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tf->u.discover_req.dialog_token = dialog_token;
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break;
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case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
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skb_put(skb, sizeof(tf->u.chan_switch_req));
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break;
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default:
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return -EINVAL;
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}
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@ -626,6 +680,7 @@ ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata,
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case WLAN_TDLS_SETUP_CONFIRM:
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case WLAN_TDLS_TEARDOWN:
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case WLAN_TDLS_DISCOVERY_REQUEST:
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case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
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ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
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sdata->dev, peer,
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action_code, dialog_token,
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@ -699,6 +754,7 @@ ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
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initiator = false;
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break;
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case WLAN_TDLS_TEARDOWN:
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case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
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/* any value is ok */
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break;
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default:
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@ -1046,3 +1102,181 @@ void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
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cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp);
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}
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EXPORT_SYMBOL(ieee80211_tdls_oper_request);
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static void
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iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout)
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{
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struct ieee80211_ch_switch_timing *ch_sw;
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*buf++ = WLAN_EID_CHAN_SWITCH_TIMING;
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*buf++ = sizeof(struct ieee80211_ch_switch_timing);
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ch_sw = (void *)buf;
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ch_sw->switch_time = cpu_to_le16(switch_time);
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ch_sw->switch_timeout = cpu_to_le16(switch_timeout);
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}
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/* find switch timing IE in SKB ready for Tx */
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static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb)
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{
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struct ieee80211_tdls_data *tf;
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const u8 *ie_start;
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/*
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* Get the offset for the new location of the switch timing IE.
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* The SKB network header will now point to the "payload_type"
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* element of the TDLS data frame struct.
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*/
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tf = container_of(skb->data + skb_network_offset(skb),
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struct ieee80211_tdls_data, payload_type);
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ie_start = tf->u.chan_switch_req.variable;
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return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start,
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skb->len - (ie_start - skb->data));
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}
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static struct sk_buff *
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ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class,
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struct cfg80211_chan_def *chandef,
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u32 *ch_sw_tm_ie_offset)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
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2 + sizeof(struct ieee80211_ch_switch_timing)];
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int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing);
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u8 *pos = extra_ies;
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struct sk_buff *skb;
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/*
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* if chandef points to a wide channel add a Secondary-Channel
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* Offset information element
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*/
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if (chandef->width == NL80211_CHAN_WIDTH_40) {
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struct ieee80211_sec_chan_offs_ie *sec_chan_ie;
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bool ht40plus;
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*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
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*pos++ = sizeof(*sec_chan_ie);
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sec_chan_ie = (void *)pos;
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ht40plus = cfg80211_get_chandef_type(chandef) ==
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NL80211_CHAN_HT40PLUS;
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sec_chan_ie->sec_chan_offs = ht40plus ?
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IEEE80211_HT_PARAM_CHA_SEC_ABOVE :
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IEEE80211_HT_PARAM_CHA_SEC_BELOW;
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pos += sizeof(*sec_chan_ie);
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extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
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}
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/* just set the values to 0, this is a template */
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iee80211_tdls_add_ch_switch_timing(pos, 0, 0);
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skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
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WLAN_TDLS_CHANNEL_SWITCH_REQUEST,
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0, 0, !sta->sta.tdls_initiator,
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extra_ies, extra_ies_len,
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oper_class, chandef);
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if (!skb)
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return NULL;
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skb = ieee80211_build_data_template(sdata, skb, 0);
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if (IS_ERR(skb)) {
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tdls_dbg(sdata, "Failed building TDLS channel switch frame\n");
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return NULL;
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}
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if (ch_sw_tm_ie_offset) {
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const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb);
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if (!tm_ie) {
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tdls_dbg(sdata, "No switch timing IE in TDLS switch\n");
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dev_kfree_skb_any(skb);
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return NULL;
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}
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*ch_sw_tm_ie_offset = tm_ie - skb->data;
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}
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tdls_dbg(sdata,
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"TDLS channel switch request template for %pM ch %d width %d\n",
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sta->sta.addr, chandef->chan->center_freq, chandef->width);
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return skb;
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}
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int
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ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev,
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const u8 *addr, u8 oper_class,
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struct cfg80211_chan_def *chandef)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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struct sk_buff *skb = NULL;
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u32 ch_sw_tm_ie;
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int ret;
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mutex_lock(&local->sta_mtx);
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sta = sta_info_get(sdata, addr);
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if (!sta) {
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tdls_dbg(sdata,
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"Invalid TDLS peer %pM for channel switch request\n",
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addr);
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ret = -ENOENT;
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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);
|
||||
}
|
||||
|
|
|
@ -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
|
||||
|
|
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