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From:   <Ajay.Kathat@microchip.com>
To:     <linux-wireless@vger.kernel.org>
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        <johannes@sipsolutions.net>, <Nicolas.Ferre@microchip.com>,
        <Claudiu.Beznea@microchip.com>, <Sripad.Balwadgi@microchip.com>,
        <Venkateswara.Kaja@microchip.com>, <Ajay.Kathat@microchip.com>
Subject: [PATCH v7 10/17] wilc1000: add mon.c
Thread-Topic: [PATCH v7 10/17] wilc1000: add mon.c
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Date:   Tue, 23 Jun 2020 11:00:10 +0000
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From: Ajay Singh <ajay.kathat@microchip.com>

Moved 'drivers/staging/wilc1000/mon.c' to
'drivers/net/wireless/microchip/wilc1000/mon.c'.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
---
 drivers/net/wireless/microchip/wilc1000/mon.c | 260 ++++++++++++++++++
 1 file changed, 260 insertions(+)
 create mode 100644 drivers/net/wireless/microchip/wilc1000/mon.c

diff --git a/drivers/net/wireless/microchip/wilc1000/mon.c b/drivers/net/wi=
reless/microchip/wilc1000/mon.c
new file mode 100644
index 000000000000..60331417bd98
--- /dev/null
+++ b/drivers/net/wireless/microchip/wilc1000/mon.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2012 - 2018 Microchip Technology Inc., and its subsidiari=
es.
+ * All rights reserved.
+ */
+
+#include "cfg80211.h"
+
+struct wilc_wfi_radiotap_hdr {
+	struct ieee80211_radiotap_header hdr;
+	u8 rate;
+} __packed;
+
+struct wilc_wfi_radiotap_cb_hdr {
+	struct ieee80211_radiotap_header hdr;
+	u8 rate;
+	u8 dump;
+	u16 tx_flags;
+} __packed;
+
+#define TX_RADIOTAP_PRESENT ((1 << IEEE80211_RADIOTAP_RATE) |	\
+			     (1 << IEEE80211_RADIOTAP_TX_FLAGS))
+
+void wilc_wfi_monitor_rx(struct net_device *mon_dev, u8 *buff, u32 size)
+{
+	u32 header, pkt_offset;
+	struct sk_buff *skb =3D NULL;
+	struct wilc_wfi_radiotap_hdr *hdr;
+	struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
+
+	if (!mon_dev)
+		return;
+
+	if (!netif_running(mon_dev))
+		return;
+
+	/* Get WILC header */
+	header =3D get_unaligned_le32(buff - HOST_HDR_OFFSET);
+	/*
+	 * The packet offset field contain info about what type of management
+	 * the frame we are dealing with and ack status
+	 */
+	pkt_offset =3D FIELD_GET(WILC_PKT_HDR_OFFSET_FIELD, header);
+
+	if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
+		/* hostapd callback mgmt frame */
+
+		skb =3D dev_alloc_skb(size + sizeof(*cb_hdr));
+		if (!skb)
+			return;
+
+		skb_put_data(skb, buff, size);
+
+		cb_hdr =3D skb_push(skb, sizeof(*cb_hdr));
+		memset(cb_hdr, 0, sizeof(*cb_hdr));
+
+		cb_hdr->hdr.it_version =3D 0; /* PKTHDR_RADIOTAP_VERSION; */
+
+		cb_hdr->hdr.it_len =3D cpu_to_le16(sizeof(*cb_hdr));
+
+		cb_hdr->hdr.it_present =3D cpu_to_le32(TX_RADIOTAP_PRESENT);
+
+		cb_hdr->rate =3D 5;
+
+		if (pkt_offset & IS_MGMT_STATUS_SUCCES)	{
+			/* success */
+			cb_hdr->tx_flags =3D IEEE80211_RADIOTAP_F_TX_RTS;
+		} else {
+			cb_hdr->tx_flags =3D IEEE80211_RADIOTAP_F_TX_FAIL;
+		}
+
+	} else {
+		skb =3D dev_alloc_skb(size + sizeof(*hdr));
+
+		if (!skb)
+			return;
+
+		skb_put_data(skb, buff, size);
+		hdr =3D skb_push(skb, sizeof(*hdr));
+		memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
+		hdr->hdr.it_version =3D 0; /* PKTHDR_RADIOTAP_VERSION; */
+		hdr->hdr.it_len =3D cpu_to_le16(sizeof(*hdr));
+		hdr->hdr.it_present =3D cpu_to_le32
+				(1 << IEEE80211_RADIOTAP_RATE);
+		hdr->rate =3D 5;
+	}
+
+	skb->dev =3D mon_dev;
+	skb_reset_mac_header(skb);
+	skb->ip_summed =3D CHECKSUM_UNNECESSARY;
+	skb->pkt_type =3D PACKET_OTHERHOST;
+	skb->protocol =3D htons(ETH_P_802_2);
+	memset(skb->cb, 0, sizeof(skb->cb));
+
+	netif_rx(skb);
+}
+
+struct tx_complete_mon_data {
+	int size;
+	void *buff;
+};
+
+static void mgmt_tx_complete(void *priv, int status)
+{
+	struct tx_complete_mon_data *pv_data =3D priv;
+	/*
+	 * in case of fully hosting mode, the freeing will be done
+	 * in response to the cfg packet
+	 */
+	kfree(pv_data->buff);
+
+	kfree(pv_data);
+}
+
+static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
+{
+	struct tx_complete_mon_data *mgmt_tx =3D NULL;
+
+	if (!dev)
+		return -EFAULT;
+
+	netif_stop_queue(dev);
+	mgmt_tx =3D kmalloc(sizeof(*mgmt_tx), GFP_ATOMIC);
+	if (!mgmt_tx)
+		return -ENOMEM;
+
+	mgmt_tx->buff =3D kmemdup(buf, len, GFP_ATOMIC);
+	if (!mgmt_tx->buff) {
+		kfree(mgmt_tx);
+		return -ENOMEM;
+	}
+
+	mgmt_tx->size =3D len;
+
+	wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
+				   mgmt_tx_complete);
+
+	netif_wake_queue(dev);
+	return 0;
+}
+
+static netdev_tx_t wilc_wfi_mon_xmit(struct sk_buff *skb,
+				     struct net_device *dev)
+{
+	u32 rtap_len, ret =3D 0;
+	struct wilc_wfi_mon_priv  *mon_priv;
+	struct sk_buff *skb2;
+	struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
+	u8 srcadd[ETH_ALEN];
+	u8 bssid[ETH_ALEN];
+
+	mon_priv =3D netdev_priv(dev);
+	if (!mon_priv)
+		return -EFAULT;
+
+	rtap_len =3D ieee80211_get_radiotap_len(skb->data);
+	if (skb->len < rtap_len)
+		return -1;
+
+	skb_pull(skb, rtap_len);
+
+	if (skb->data[0] =3D=3D 0xc0 && is_broadcast_ether_addr(&skb->data[4])) {
+		skb2 =3D dev_alloc_skb(skb->len + sizeof(*cb_hdr));
+		if (!skb2)
+			return -ENOMEM;
+
+		skb_put_data(skb2, skb->data, skb->len);
+
+		cb_hdr =3D skb_push(skb2, sizeof(*cb_hdr));
+		memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
+
+		cb_hdr->hdr.it_version =3D 0; /* PKTHDR_RADIOTAP_VERSION; */
+
+		cb_hdr->hdr.it_len =3D cpu_to_le16(sizeof(*cb_hdr));
+
+		cb_hdr->hdr.it_present =3D cpu_to_le32(TX_RADIOTAP_PRESENT);
+
+		cb_hdr->rate =3D 5;
+		cb_hdr->tx_flags =3D 0x0004;
+
+		skb2->dev =3D dev;
+		skb_reset_mac_header(skb2);
+		skb2->ip_summed =3D CHECKSUM_UNNECESSARY;
+		skb2->pkt_type =3D PACKET_OTHERHOST;
+		skb2->protocol =3D htons(ETH_P_802_2);
+		memset(skb2->cb, 0, sizeof(skb2->cb));
+
+		netif_rx(skb2);
+
+		return 0;
+	}
+	skb->dev =3D mon_priv->real_ndev;
+
+	ether_addr_copy(srcadd, &skb->data[10]);
+	ether_addr_copy(bssid, &skb->data[16]);
+	/*
+	 * Identify if data or mgmt packet, if source address and bssid
+	 * fields are equal send it to mgmt frames handler
+	 */
+	if (!(memcmp(srcadd, bssid, 6))) {
+		ret =3D mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
+		if (ret)
+			netdev_err(dev, "fail to mgmt tx\n");
+		dev_kfree_skb(skb);
+	} else {
+		ret =3D wilc_mac_xmit(skb, mon_priv->real_ndev);
+	}
+
+	return ret;
+}
+
+static const struct net_device_ops wilc_wfi_netdev_ops =3D {
+	.ndo_start_xmit         =3D wilc_wfi_mon_xmit,
+
+};
+
+struct net_device *wilc_wfi_init_mon_interface(struct wilc *wl,
+					       const char *name,
+					       struct net_device *real_dev)
+{
+	struct wilc_wfi_mon_priv *priv;
+
+	/* If monitor interface is already initialized, return it */
+	if (wl->monitor_dev)
+		return wl->monitor_dev;
+
+	wl->monitor_dev =3D alloc_etherdev(sizeof(struct wilc_wfi_mon_priv));
+	if (!wl->monitor_dev)
+		return NULL;
+
+	wl->monitor_dev->type =3D ARPHRD_IEEE80211_RADIOTAP;
+	strncpy(wl->monitor_dev->name, name, IFNAMSIZ);
+	wl->monitor_dev->name[IFNAMSIZ - 1] =3D 0;
+	wl->monitor_dev->netdev_ops =3D &wilc_wfi_netdev_ops;
+	wl->monitor_dev->needs_free_netdev =3D true;
+
+	if (register_netdevice(wl->monitor_dev)) {
+		netdev_err(real_dev, "register_netdevice failed\n");
+		return NULL;
+	}
+	priv =3D netdev_priv(wl->monitor_dev);
+	if (!priv)
+		return NULL;
+
+	priv->real_ndev =3D real_dev;
+
+	return wl->monitor_dev;
+}
+
+void wilc_wfi_deinit_mon_interface(struct wilc *wl, bool rtnl_locked)
+{
+	if (!wl->monitor_dev)
+		return;
+
+	if (rtnl_locked)
+		unregister_netdevice(wl->monitor_dev);
+	else
+		unregister_netdev(wl->monitor_dev);
+	wl->monitor_dev =3D NULL;
+}
--=20
2.24.0