mwifiex: add tdls_mgmt handler support

This patch adds support for TDLS management frames transmit
handler. mwifiex driver supports TDLS with external support,
i.e. expects user space application to form TDLS frames.
Same is advertised to cfg80211 during registration.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 423 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/tdls.c b/drivers/net/wireless/mwifiex/tdls.c
new file mode 100644
index 00000000000..73cd444a6d4
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/tdls.c
@@ -0,0 +1,423 @@
+/* Marvell Wireless LAN device driver: TDLS handling
+ *
+ * Copyright (C) 2014, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available on the worldwide web at
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ */
+
+#include "main.h"
+
+/* This function appends rate TLV to scan config command. */
+static int
+mwifiex_tdls_append_rates_ie(struct mwifiex_private *priv,
+			     struct sk_buff *skb)
+{
+	u8 rates[MWIFIEX_SUPPORTED_RATES], *pos;
+	u16 rates_size, supp_rates_size, ext_rates_size;
+
+	memset(rates, 0, sizeof(rates));
+	rates_size = mwifiex_get_supported_rates(priv, rates);
+
+	supp_rates_size = min_t(u16, rates_size, MWIFIEX_TDLS_SUPPORTED_RATES);
+
+	if (skb_tailroom(skb) < rates_size + 4) {
+		dev_err(priv->adapter->dev,
+			"Insuffient space while adding rates\n");
+		return -ENOMEM;
+	}
+
+	pos = skb_put(skb, supp_rates_size + 2);
+	*pos++ = WLAN_EID_SUPP_RATES;
+	*pos++ = supp_rates_size;
+	memcpy(pos, rates, supp_rates_size);
+
+	if (rates_size > MWIFIEX_TDLS_SUPPORTED_RATES) {
+		ext_rates_size = rates_size - MWIFIEX_TDLS_SUPPORTED_RATES;
+		pos = skb_put(skb, ext_rates_size + 2);
+		*pos++ = WLAN_EID_EXT_SUPP_RATES;
+		*pos++ = ext_rates_size;
+		memcpy(pos, rates + MWIFIEX_TDLS_SUPPORTED_RATES,
+		       ext_rates_size);
+	}
+
+	return 0;
+}
+
+static void mwifiex_tdls_add_ext_capab(struct sk_buff *skb)
+{
+	struct ieee_types_extcap *extcap;
+
+	extcap = (void *)skb_put(skb, sizeof(struct ieee_types_extcap));
+	extcap->ieee_hdr.element_id = WLAN_EID_EXT_CAPABILITY;
+	extcap->ieee_hdr.len = 8;
+	memset(extcap->ext_capab, 0, 8);
+	extcap->ext_capab[4] |= WLAN_EXT_CAPA5_TDLS_ENABLED;
+}
+
+static void mwifiex_tdls_add_qos_capab(struct sk_buff *skb)
+{
+	u8 *pos = (void *)skb_put(skb, 3);
+
+	*pos++ = WLAN_EID_QOS_CAPA;
+	*pos++ = 1;
+	*pos++ = MWIFIEX_TDLS_DEF_QOS_CAPAB;
+}
+
+static int mwifiex_prep_tdls_encap_data(struct mwifiex_private *priv,
+			     u8 *peer, u8 action_code, u8 dialog_token,
+			     u16 status_code, struct sk_buff *skb)
+{
+	struct ieee80211_tdls_data *tf;
+	int ret;
+	u16 capab;
+	struct ieee80211_ht_cap *ht_cap;
+	u8 radio, *pos;
+
+	capab = priv->curr_bss_params.bss_descriptor.cap_info_bitmap;
+
+	tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
+	memcpy(tf->da, peer, ETH_ALEN);
+	memcpy(tf->sa, priv->curr_addr, ETH_ALEN);
+	tf->ether_type = cpu_to_be16(ETH_P_TDLS);
+	tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
+
+	switch (action_code) {
+	case WLAN_TDLS_SETUP_REQUEST:
+		tf->category = WLAN_CATEGORY_TDLS;
+		tf->action_code = WLAN_TDLS_SETUP_REQUEST;
+		skb_put(skb, sizeof(tf->u.setup_req));
+		tf->u.setup_req.dialog_token = dialog_token;
+		tf->u.setup_req.capability = cpu_to_le16(capab);
+		ret = mwifiex_tdls_append_rates_ie(priv, skb);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		pos = (void *)skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
+		*pos++ = WLAN_EID_HT_CAPABILITY;
+		*pos++ = sizeof(struct ieee80211_ht_cap);
+		ht_cap = (void *)pos;
+		radio = mwifiex_band_to_radio_type(priv->curr_bss_params.band);
+		ret = mwifiex_fill_cap_info(priv, radio, ht_cap);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		mwifiex_tdls_add_ext_capab(skb);
+		mwifiex_tdls_add_qos_capab(skb);
+		break;
+
+	case WLAN_TDLS_SETUP_RESPONSE:
+		tf->category = WLAN_CATEGORY_TDLS;
+		tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
+		skb_put(skb, sizeof(tf->u.setup_resp));
+		tf->u.setup_resp.status_code = cpu_to_le16(status_code);
+		tf->u.setup_resp.dialog_token = dialog_token;
+		tf->u.setup_resp.capability = cpu_to_le16(capab);
+		ret = mwifiex_tdls_append_rates_ie(priv, skb);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		pos = (void *)skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
+		*pos++ = WLAN_EID_HT_CAPABILITY;
+		*pos++ = sizeof(struct ieee80211_ht_cap);
+		ht_cap = (void *)pos;
+		radio = mwifiex_band_to_radio_type(priv->curr_bss_params.band);
+		ret = mwifiex_fill_cap_info(priv, radio, ht_cap);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		mwifiex_tdls_add_ext_capab(skb);
+		mwifiex_tdls_add_qos_capab(skb);
+		break;
+
+	case WLAN_TDLS_SETUP_CONFIRM:
+		tf->category = WLAN_CATEGORY_TDLS;
+		tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
+		skb_put(skb, sizeof(tf->u.setup_cfm));
+		tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
+		tf->u.setup_cfm.dialog_token = dialog_token;
+		break;
+
+	case WLAN_TDLS_TEARDOWN:
+		tf->category = WLAN_CATEGORY_TDLS;
+		tf->action_code = WLAN_TDLS_TEARDOWN;
+		skb_put(skb, sizeof(tf->u.teardown));
+		tf->u.teardown.reason_code = cpu_to_le16(status_code);
+		break;
+
+	case WLAN_TDLS_DISCOVERY_REQUEST:
+		tf->category = WLAN_CATEGORY_TDLS;
+		tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
+		skb_put(skb, sizeof(tf->u.discover_req));
+		tf->u.discover_req.dialog_token = dialog_token;
+		break;
+	default:
+		dev_err(priv->adapter->dev, "Unknown TDLS frame type.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void
+mwifiex_tdls_add_link_ie(struct sk_buff *skb, u8 *src_addr, u8 *peer, u8 *bssid)
+{
+	struct ieee80211_tdls_lnkie *lnkid;
+
+	lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
+	lnkid->ie_type = WLAN_EID_LINK_ID;
+	lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) -
+			sizeof(struct ieee_types_header);
+
+	memcpy(lnkid->bssid, bssid, ETH_ALEN);
+	memcpy(lnkid->init_sta, src_addr, ETH_ALEN);
+	memcpy(lnkid->resp_sta, peer, ETH_ALEN);
+}
+
+int mwifiex_send_tdls_data_frame(struct mwifiex_private *priv,
+				 u8 *peer, u8 action_code, u8 dialog_token,
+				 u16 status_code, const u8 *extra_ies,
+				 size_t extra_ies_len)
+{
+	struct sk_buff *skb;
+	struct mwifiex_txinfo *tx_info;
+	struct timeval tv;
+	int ret;
+	u16 skb_len;
+
+	skb_len = MWIFIEX_MIN_DATA_HEADER_LEN +
+		  max(sizeof(struct ieee80211_mgmt),
+		      sizeof(struct ieee80211_tdls_data)) +
+		  MWIFIEX_MGMT_FRAME_HEADER_SIZE +
+		  MWIFIEX_SUPPORTED_RATES +
+		  3 + /* Qos Info */
+		  sizeof(struct ieee_types_extcap) +
+		  sizeof(struct ieee80211_ht_cap) +
+		  sizeof(struct ieee_types_bss_co_2040) +
+		  sizeof(struct ieee80211_ht_operation) +
+		  sizeof(struct ieee80211_tdls_lnkie) +
+		  extra_ies_len;
+
+	skb = dev_alloc_skb(skb_len);
+	if (!skb) {
+		dev_err(priv->adapter->dev,
+			"allocate skb failed for management frame\n");
+		return -ENOMEM;
+	}
+	skb_reserve(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
+
+	switch (action_code) {
+	case WLAN_TDLS_SETUP_REQUEST:
+	case WLAN_TDLS_SETUP_CONFIRM:
+	case WLAN_TDLS_TEARDOWN:
+	case WLAN_TDLS_DISCOVERY_REQUEST:
+		ret = mwifiex_prep_tdls_encap_data(priv, peer, action_code,
+						   dialog_token, status_code,
+						   skb);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+		if (extra_ies_len)
+			memcpy(skb_put(skb, extra_ies_len), extra_ies,
+			       extra_ies_len);
+		mwifiex_tdls_add_link_ie(skb, priv->curr_addr, peer,
+					 priv->cfg_bssid);
+		break;
+	case WLAN_TDLS_SETUP_RESPONSE:
+		ret = mwifiex_prep_tdls_encap_data(priv, peer, action_code,
+						   dialog_token, status_code,
+						   skb);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+		if (extra_ies_len)
+			memcpy(skb_put(skb, extra_ies_len), extra_ies,
+			       extra_ies_len);
+		mwifiex_tdls_add_link_ie(skb, peer, priv->curr_addr,
+					 priv->cfg_bssid);
+		break;
+	}
+
+	switch (action_code) {
+	case WLAN_TDLS_SETUP_REQUEST:
+	case WLAN_TDLS_SETUP_RESPONSE:
+		skb->priority = MWIFIEX_PRIO_BK;
+		break;
+	default:
+		skb->priority = MWIFIEX_PRIO_VI;
+		break;
+	}
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	tx_info->bss_num = priv->bss_num;
+	tx_info->bss_type = priv->bss_type;
+
+	do_gettimeofday(&tv);
+	skb->tstamp = timeval_to_ktime(tv);
+	mwifiex_queue_tx_pkt(priv, skb);
+
+	return 0;
+}
+
+static int
+mwifiex_construct_tdls_action_frame(struct mwifiex_private *priv, u8 *peer,
+				    u8 action_code, u8 dialog_token,
+				    u16 status_code, struct sk_buff *skb)
+{
+	struct ieee80211_mgmt *mgmt;
+	u8 bc_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+	int ret;
+	u16 capab;
+	struct ieee80211_ht_cap *ht_cap;
+	u8 radio, *pos;
+
+	capab = priv->curr_bss_params.bss_descriptor.cap_info_bitmap;
+
+	mgmt = (void *)skb_put(skb, offsetof(struct ieee80211_mgmt, u));
+
+	memset(mgmt, 0, 24);
+	memcpy(mgmt->da, peer, ETH_ALEN);
+	memcpy(mgmt->sa, priv->curr_addr, ETH_ALEN);
+	memcpy(mgmt->bssid, priv->cfg_bssid, ETH_ALEN);
+	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+					  IEEE80211_STYPE_ACTION);
+
+	/* add address 4 */
+	pos = skb_put(skb, ETH_ALEN);
+
+	switch (action_code) {
+	case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
+		skb_put(skb, sizeof(mgmt->u.action.u.tdls_discover_resp) + 1);
+		mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
+		mgmt->u.action.u.tdls_discover_resp.action_code =
+					      WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
+		mgmt->u.action.u.tdls_discover_resp.dialog_token =
+								   dialog_token;
+		mgmt->u.action.u.tdls_discover_resp.capability =
+							     cpu_to_le16(capab);
+		/* move back for addr4 */
+		memmove(pos + ETH_ALEN, &mgmt->u.action.category,
+			sizeof(mgmt->u.action.u.tdls_discover_resp));
+		/* init address 4 */
+		memcpy(pos, bc_addr, ETH_ALEN);
+
+		ret = mwifiex_tdls_append_rates_ie(priv, skb);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		pos = (void *)skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
+		*pos++ = WLAN_EID_HT_CAPABILITY;
+		*pos++ = sizeof(struct ieee80211_ht_cap);
+		ht_cap = (void *)pos;
+		radio = mwifiex_band_to_radio_type(priv->curr_bss_params.band);
+		ret = mwifiex_fill_cap_info(priv, radio, ht_cap);
+		if (ret) {
+			dev_kfree_skb_any(skb);
+			return ret;
+		}
+
+		mwifiex_tdls_add_ext_capab(skb);
+		mwifiex_tdls_add_qos_capab(skb);
+		break;
+	default:
+		dev_err(priv->adapter->dev, "Unknown TDLS action frame type\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int mwifiex_send_tdls_action_frame(struct mwifiex_private *priv,
+				 u8 *peer, u8 action_code, u8 dialog_token,
+				 u16 status_code, const u8 *extra_ies,
+				 size_t extra_ies_len)
+{
+	struct sk_buff *skb;
+	struct mwifiex_txinfo *tx_info;
+	struct timeval tv;
+	u8 *pos;
+	u32 pkt_type, tx_control;
+	u16 pkt_len, skb_len;
+
+	skb_len = MWIFIEX_MIN_DATA_HEADER_LEN +
+		  max(sizeof(struct ieee80211_mgmt),
+		      sizeof(struct ieee80211_tdls_data)) +
+		  MWIFIEX_MGMT_FRAME_HEADER_SIZE +
+		  MWIFIEX_SUPPORTED_RATES +
+		  sizeof(struct ieee_types_extcap) +
+		  sizeof(struct ieee80211_ht_cap) +
+		  sizeof(struct ieee_types_bss_co_2040) +
+		  sizeof(struct ieee80211_ht_operation) +
+		  sizeof(struct ieee80211_tdls_lnkie) +
+		  extra_ies_len +
+		  3 + /* Qos Info */
+		  ETH_ALEN; /* Address4 */
+
+	skb = dev_alloc_skb(skb_len);
+	if (!skb) {
+		dev_err(priv->adapter->dev,
+			"allocate skb failed for management frame\n");
+		return -ENOMEM;
+	}
+
+	skb_reserve(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
+
+	pkt_type = PKT_TYPE_MGMT;
+	tx_control = 0;
+	pos = skb_put(skb, MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(pkt_len));
+	memset(pos, 0, MWIFIEX_MGMT_FRAME_HEADER_SIZE + sizeof(pkt_len));
+	memcpy(pos, &pkt_type, sizeof(pkt_type));
+	memcpy(pos + sizeof(pkt_type), &tx_control, sizeof(tx_control));
+
+	if (mwifiex_construct_tdls_action_frame(priv, peer, action_code,
+						dialog_token, status_code,
+						skb)) {
+		dev_kfree_skb_any(skb);
+		return -EINVAL;
+	}
+
+	if (extra_ies_len)
+		memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
+
+	/* the TDLS link IE is always added last we are the responder */
+
+	mwifiex_tdls_add_link_ie(skb, peer, priv->curr_addr,
+				 priv->cfg_bssid);
+
+	skb->priority = MWIFIEX_PRIO_VI;
+
+	tx_info = MWIFIEX_SKB_TXCB(skb);
+	tx_info->bss_num = priv->bss_num;
+	tx_info->bss_type = priv->bss_type;
+	tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
+
+	pkt_len = skb->len - MWIFIEX_MGMT_FRAME_HEADER_SIZE - sizeof(pkt_len);
+	memcpy(skb->data + MWIFIEX_MGMT_FRAME_HEADER_SIZE, &pkt_len,
+	       sizeof(pkt_len));
+	do_gettimeofday(&tv);
+	skb->tstamp = timeval_to_ktime(tv);
+	mwifiex_queue_tx_pkt(priv, skb);
+
+	return 0;
+}