struct cfg80211_scan_request req;
};
+/**
+ * struct ieee80211_tdls_ch_sw_params - TDLS channel switch parameters
+ *
+ * @sta: peer this TDLS channel-switch request/response came from
+ * @chandef: channel referenced in a TDLS channel-switch request
+ * @action_code: see &enum ieee80211_tdls_actioncode
+ * @status: channel-switch response status
+ * @timestamp: time at which the frame was received
+ * @switch_time: switch-timing parameter received in the frame
+ * @switch_timeout: switch-timing parameter received in the frame
+ * @tmpl_skb: TDLS switch-channel response template
+ * @ch_sw_tm_ie: offset of the channel-switch timing IE inside @tmpl_skb
+ */
+struct ieee80211_tdls_ch_sw_params {
+ struct ieee80211_sta *sta;
+ struct cfg80211_chan_def *chandef;
+ u8 action_code;
+ u32 status;
+ u32 timestamp;
+ u16 switch_time;
+ u16 switch_timeout;
+ struct sk_buff *tmpl_skb;
+ u32 ch_sw_tm_ie;
+};
+
/**
* wiphy_to_ieee80211_hw - return a mac80211 driver hw struct from a wiphy
*
* 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.
+ * @tdls_recv_channel_switch: a TDLS channel-switch related frame (request or
+ * response) has been received from a remote peer. The driver gets
+ * parameters parsed from the incoming frame and may use them to continue
+ * an ongoing channel-switch operation. In addition, a channel-switch
+ * response template is provided, together with the location of the
+ * switch-timing IE within the template. The skb can only be used within
+ * the function call.
*/
struct ieee80211_ops {
void (*tx)(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);
+ struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie);
void (*tdls_cancel_channel_switch)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta);
+ void (*tdls_recv_channel_switch)(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_tdls_ch_sw_params *params);
};
/**
}
}
+static void
+ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, const u8 *peer,
+ u16 status_code, bool initiator,
+ const u8 *extra_ies,
+ size_t extra_ies_len)
+{
+ if (status_code == 0)
+ ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator);
+
+ if (extra_ies_len)
+ memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
+}
+
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,
extra_ies_len,
oper_class, chandef);
break;
+ case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+ ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer,
+ status_code,
+ initiator, extra_ies,
+ extra_ies_len);
+ break;
}
}
skb_put(skb, sizeof(tf->u.chan_switch_req));
break;
+ case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+ tf->category = WLAN_CATEGORY_TDLS;
+ tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
+
+ skb_put(skb, sizeof(tf->u.chan_switch_resp));
+ tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code);
+ break;
default:
return -EINVAL;
}
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_DISCOVERY_REQUEST:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+ case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy,
sdata->dev, peer,
action_code, dialog_token,
break;
case WLAN_TDLS_TEARDOWN:
case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+ case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
/* any value is ok */
break;
default:
out:
mutex_unlock(&local->sta_mtx);
}
+
+static struct sk_buff *
+ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta,
+ u32 *ch_sw_tm_ie_offset)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct sk_buff *skb;
+ u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)];
+
+ /* initial timing are always zero in the template */
+ iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0);
+
+ skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr,
+ WLAN_TDLS_CHANNEL_SWITCH_RESPONSE,
+ 0, 0, !sta->sta.tdls_initiator,
+ extra_ies, sizeof(extra_ies), 0, NULL);
+ if (!skb)
+ return NULL;
+
+ skb = ieee80211_build_data_template(sdata, skb, 0);
+ if (IS_ERR(skb)) {
+ tdls_dbg(sdata,
+ "Failed building TDLS channel switch resp 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 resp\n");
+ dev_kfree_skb_any(skb);
+ return NULL;
+ }
+
+ *ch_sw_tm_ie_offset = tm_ie - skb->data;
+ }
+
+ tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n",
+ sta->sta.addr);
+ return skb;
+}
+
+static int
+ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee802_11_elems elems;
+ struct sta_info *sta;
+ struct ieee80211_tdls_data *tf = (void *)skb->data;
+ bool local_initiator;
+ struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
+ int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable);
+ struct ieee80211_tdls_ch_sw_params params = {};
+ int ret;
+
+ params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE;
+ params.timestamp = rx_status->device_timestamp;
+
+ if (skb->len < baselen) {
+ tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n",
+ skb->len);
+ return -EINVAL;
+ }
+
+ mutex_lock(&local->sta_mtx);
+ sta = sta_info_get(sdata, tf->sa);
+ if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
+ tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
+ tf->sa);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ params.sta = &sta->sta;
+ params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code);
+ if (params.status != 0) {
+ ret = 0;
+ goto call_drv;
+ }
+
+ ieee802_11_parse_elems(tf->u.chan_switch_resp.variable,
+ skb->len - baselen, false, &elems);
+ if (elems.parse_error) {
+ tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (!elems.ch_sw_timing || !elems.lnk_id) {
+ tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* validate the initiator is set correctly */
+ local_initiator =
+ !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
+ if (local_initiator == sta->sta.tdls_initiator) {
+ tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
+ params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
+
+ params.tmpl_skb =
+ ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie);
+ if (!params.tmpl_skb) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+call_drv:
+ drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
+
+ tdls_dbg(sdata,
+ "TDLS channel switch response received from %pM status %d\n",
+ tf->sa, params.status);
+
+out:
+ mutex_unlock(&local->sta_mtx);
+ dev_kfree_skb_any(params.tmpl_skb);
+ return ret;
+}
+
+static int
+ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee802_11_elems elems;
+ struct cfg80211_chan_def chandef;
+ struct ieee80211_channel *chan;
+ enum nl80211_channel_type chan_type;
+ int freq;
+ u8 target_channel, oper_class;
+ bool local_initiator;
+ struct sta_info *sta;
+ enum ieee80211_band band;
+ struct ieee80211_tdls_data *tf = (void *)skb->data;
+ struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
+ int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable);
+ struct ieee80211_tdls_ch_sw_params params = {};
+ int ret = 0;
+
+ params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST;
+ params.timestamp = rx_status->device_timestamp;
+
+ if (skb->len < baselen) {
+ tdls_dbg(sdata, "TDLS channel switch req too short: %d\n",
+ skb->len);
+ return -EINVAL;
+ }
+
+ target_channel = tf->u.chan_switch_req.target_channel;
+ oper_class = tf->u.chan_switch_req.oper_class;
+
+ /*
+ * We can't easily infer the channel band. The operating class is
+ * ambiguous - there are multiple tables (US/Europe/JP/Global). The
+ * solution here is to treat channels with number >14 as 5GHz ones,
+ * and specifically check for the (oper_class, channel) combinations
+ * where this doesn't hold. These are thankfully unique according to
+ * IEEE802.11-2012.
+ * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as
+ * valid here.
+ */
+ if ((oper_class == 112 || oper_class == 2 || oper_class == 3 ||
+ oper_class == 4 || oper_class == 5 || oper_class == 6) &&
+ target_channel < 14)
+ band = IEEE80211_BAND_5GHZ;
+ else
+ band = target_channel < 14 ? IEEE80211_BAND_2GHZ :
+ IEEE80211_BAND_5GHZ;
+
+ freq = ieee80211_channel_to_frequency(target_channel, band);
+ if (freq == 0) {
+ tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n",
+ target_channel);
+ return -EINVAL;
+ }
+
+ chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
+ if (!chan) {
+ tdls_dbg(sdata,
+ "Unsupported channel for TDLS chan switch: %d\n",
+ target_channel);
+ return -EINVAL;
+ }
+
+ ieee802_11_parse_elems(tf->u.chan_switch_req.variable,
+ skb->len - baselen, false, &elems);
+ if (elems.parse_error) {
+ tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n");
+ return -EINVAL;
+ }
+
+ if (!elems.ch_sw_timing || !elems.lnk_id) {
+ tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&local->sta_mtx);
+ sta = sta_info_get(sdata, tf->sa);
+ if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) {
+ tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n",
+ tf->sa);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ params.sta = &sta->sta;
+
+ /* validate the initiator is set correctly */
+ local_initiator =
+ !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN);
+ if (local_initiator == sta->sta.tdls_initiator) {
+ tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (!sta->sta.ht_cap.ht_supported) {
+ chan_type = NL80211_CHAN_NO_HT;
+ } else if (!elems.sec_chan_offs) {
+ chan_type = NL80211_CHAN_HT20;
+ } else {
+ switch (elems.sec_chan_offs->sec_chan_offs) {
+ case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+ chan_type = NL80211_CHAN_HT40PLUS;
+ break;
+ case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+ chan_type = NL80211_CHAN_HT40MINUS;
+ break;
+ default:
+ chan_type = NL80211_CHAN_HT20;
+ break;
+ }
+ }
+
+ cfg80211_chandef_create(&chandef, chan, chan_type);
+ params.chandef = &chandef;
+
+ params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time);
+ params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout);
+
+ params.tmpl_skb =
+ ieee80211_tdls_ch_sw_resp_tmpl_get(sta,
+ ¶ms.ch_sw_tm_ie);
+ if (!params.tmpl_skb) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms);
+
+ tdls_dbg(sdata,
+ "TDLS ch switch request received from %pM ch %d width %d\n",
+ tf->sa, params.chandef->chan->center_freq,
+ params.chandef->width);
+out:
+ mutex_unlock(&local->sta_mtx);
+ dev_kfree_skb_any(params.tmpl_skb);
+ return ret;
+}
+
+void ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ struct ieee80211_tdls_data *tf = (void *)skb->data;
+ struct wiphy *wiphy = sdata->local->hw.wiphy;
+
+ /* make sure the driver supports it */
+ if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
+ return;
+
+ /* we want to access the entire packet */
+ if (skb_linearize(skb))
+ return;
+ /*
+ * The packet/size was already validated by mac80211 Rx path, only look
+ * at the action type.
+ */
+ switch (tf->action_code) {
+ case WLAN_TDLS_CHANNEL_SWITCH_REQUEST:
+ ieee80211_process_tdls_channel_switch_req(sdata, skb);
+ break;
+ case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE:
+ ieee80211_process_tdls_channel_switch_resp(sdata, skb);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return;
+ }
+}
#define STA_ENTRY __array(char, sta_addr, ETH_ALEN)
#define STA_ASSIGN (sta ? memcpy(__entry->sta_addr, sta->addr, ETH_ALEN) : memset(__entry->sta_addr, 0, ETH_ALEN))
+#define STA_NAMED_ASSIGN(s) memcpy(__entry->sta_addr, (s)->addr, ETH_ALEN)
#define STA_PR_FMT " sta:%pM"
#define STA_PR_ARG __entry->sta_addr
)
);
+TRACE_EVENT(drv_tdls_recv_channel_switch,
+ TP_PROTO(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_tdls_ch_sw_params *params),
+
+ TP_ARGS(local, sdata, params),
+
+ TP_STRUCT__entry(
+ LOCAL_ENTRY
+ VIF_ENTRY
+ __field(u8, action_code)
+ STA_ENTRY
+ CHANDEF_ENTRY
+ __field(u32, status)
+ __field(bool, peer_initiator)
+ __field(u32, timestamp)
+ __field(u16, switch_time)
+ __field(u16, switch_timeout)
+ ),
+
+ TP_fast_assign(
+ LOCAL_ASSIGN;
+ VIF_ASSIGN;
+ STA_NAMED_ASSIGN(params->sta);
+ CHANDEF_ASSIGN(params->chandef)
+ __entry->peer_initiator = params->sta->tdls_initiator;
+ __entry->action_code = params->action_code;
+ __entry->status = params->status;
+ __entry->timestamp = params->timestamp;
+ __entry->switch_time = params->switch_time;
+ __entry->switch_timeout = params->switch_timeout;
+ ),
+
+ TP_printk(
+ LOCAL_PR_FMT VIF_PR_FMT " received tdls channel switch packet"
+ " action:%d status:%d time:%d switch time:%d switch"
+ " timeout:%d initiator: %d chan:" CHANDEF_PR_FMT STA_PR_FMT,
+ LOCAL_PR_ARG, VIF_PR_ARG, __entry->action_code, __entry->status,
+ __entry->timestamp, __entry->switch_time,
+ __entry->switch_timeout, __entry->peer_initiator,
+ CHANDEF_PR_ARG, STA_PR_ARG
+ )
+);
+
#ifdef CONFIG_MAC80211_MESSAGE_TRACING
#undef TRACE_SYSTEM
#define TRACE_SYSTEM mac80211_msg
projects / karo-tx-linux.git / commitdiff