[PATCH V3 4/7] net: maclorawan: Add maclorawan module declaration

[Jian-Hong Pan <starnight@g.ncu.edu.tw>]

Add the maclorawan header file for common APIs in the module.

Signed-off-by: Jian-Hong Pan <starnight@g.ncu.edu.tw>
---
V2:
- Split the LoRaWAN class module patch in V1 into LoRaWAN socket and
  LoRaWAN Soft MAC modules
- Use SPDX license identifiers

 net/maclorawan/maclorawan.h | 199 ++++++++++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)
 create mode 100644 net/maclorawan/maclorawan.h

diff --git a/net/maclorawan/maclorawan.h b/net/maclorawan/maclorawan.h
new file mode 100644
index 000000000000..66b87f051d51
--- /dev/null
+++ b/net/maclorawan/maclorawan.h
@@ -0,0 +1,199 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
+/*-
+ * LoRaWAN soft MAC
+ *
+ * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
+ *
+ */
+
+#ifndef __MAC_LORAWAN_H__
+#define __MAC_LORAWAN_H__
+
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/workqueue.h>
+#include <linux/netdevice.h>
+#include <uapi/linux/if_arp.h>
+#include <crypto/hash.h>
+#include <crypto/skcipher.h>
+#include <linux/lora/lorawan.h>
+
+#define	LORAWAN_MODULE_NAME	"maclorawan"
+
+/* List the message types of LoRaWAN */
+enum {
+	LRW_JOIN_REQUEST,
+	LRW_JOIN_ACCEPT,
+	LRW_UNCONFIRMED_DATA_UP,
+	LRW_UNCONFIRMED_DATA_DOWN,
+	LRW_CONFIRMED_DATA_UP,
+	LRW_CONFIRMED_DATA_DOWN,
+	LRW_RFU,
+	LRW_PROPRIETARY,
+};
+
+/* List the communication directions */
+enum {
+	LRW_UPLINK,
+	LRW_DOWNLINK,
+};
+
+/* States of LoRaWAN slot timing */
+enum {
+	LRW_INIT_SS,
+	LRW_XMITTING_SS,
+	LRW_XMITTED,
+	LRW_RX1_SS,
+	LRW_RX2_SS,
+	LRW_RXTIMEOUT_SS,
+	LRW_RXRECEIVED_SS,
+	LRW_RETRANSMIT_SS,
+};
+
+#define	LRW_MHDR_LEN		1
+#define	LRW_FHDR_MAX_LEN	22
+#define	LRW_FOPS_MAX_LEN	15
+#define	LRW_FPORT_LEN		1
+#define	LRW_MIC_LEN		4
+
+/**
+ * lrw_fhdr - Hold the message's basic information of the frame
+ *
+ * @mtype:		this message's type
+ * @fctrl:		the frame control byte
+ * @fcnt:		this message's frame counter value
+ * @fopts:		this frame's options field
+ * @fopts_len:		the length of the fopts
+ */
+struct lrw_fhdr {
+	u8 mtype;
+	u8 fctrl;
+	u16 fcnt;
+	u8 fopts[LRW_FPORT_LEN];
+	u8 fopts_len;
+};
+
+/**
+ * lrw_session - LoRaWAN session for Class A end device
+ *
+ * @lrw_st:		points to the belonging lrw_st
+ * @entry:		the entry of the ss_list in lrw_struct
+ * @devaddr:		the LoRaWAN device address of this LoRaWAN hardware
+ * @fcnt_up:		uplink frame counter
+ * @fcnt_down:		downlink frame counter
+ * @fport:		the LoRaWAN data message's port field
+ * @tx_skb:		points to the TX skb, the frame
+ * @rx_skb:		points to the RX skb, the frame
+ * @tx_fhdr:		hold the message's basic information of the TX frame
+ * @rx_fhdr:		hold the message's basic information of the RX frame
+ * @tx_should_ack:	flag for determining the TX which should be acked or not
+ * @retry:		retry times for xmitting failed
+ * @state:		this session's current state
+ * @state_lock:		lock of the session's state
+ * @timer:		timing for this session and the state transition
+ * @timeout_work:	work if waiting acknowledge time out
+ * @rx_delay1:		RX1 delay time in seconds
+ * @rx_delay2:		RX2 delay time in seconds
+ * @rx1_window:		RX1 window opening time in mini-seconds
+ * @rx2_window:		RX2 window opening time in mini-seconds
+ * @ack_timeout:	time out time for waiting acknowledge in seconds
+ */
+struct lrw_session {
+	struct lrw_struct *lrw_st;
+	struct list_head entry;
+
+	u32 devaddr;
+	u16 fcnt_up;
+	u16 fcnt_down;
+	u8 fport;
+	struct sk_buff *tx_skb;
+	struct sk_buff *rx_skb;
+	struct lrw_fhdr tx_fhdr;
+	struct lrw_fhdr rx_fhdr;
+
+	bool tx_should_ack;
+	u8 retry;
+	u8 state;
+	spinlock_t state_lock;
+
+	struct timer_list timer;
+	struct work_struct timeout_work;
+	unsigned long rx_delay1;
+	unsigned long rx_delay2;
+	unsigned long rx1_window;
+	unsigned long rx2_window;
+	unsigned long ack_timeout;
+};
+
+/**
+ * lrw_struct - The full LoRaWAN hardware to the LoRa device.
+ *
+ * @dev:		this LoRa device registed in system
+ * @hw:			the LoRa device of this LoRaWAN hardware
+ * @ops:		handle of LoRa operations interfaces
+ * @rx_skb_list:	the list of received frames
+ * @ss_list:		LoRaWAN session list of this LoRaWAN hardware
+ * @_cur_ss:		pointer of the current processing session
+ * @rx_should_ack:	represent the current session should be acked or not
+ * @state:		the state of this LoRaWAN hardware
+ * @app_eui:		the LoRaWAN application EUI
+ * @dev_eui:		the LoRaWAN device EUI
+ * @devaddr:		the LoRaWAN device address of this LoRaWAN hardware
+ * @appky:		the Application key
+ * @nwkskey:		the Network session key
+ * @appskey:		the Application session key
+ * @nwks_shash_tfm:	the hash handler for LoRaWAN network session
+ * @nwks_skc_tfm:	the crypto handler for LoRaWAN network session
+ * @apps_skc_tfm:	the crypto handler for LoRaWAN application session
+ * @fcnt_up:		the counter of this LoRaWAN hardware's up frame
+ * @fcnt_down:		the counter of this LoRaWAN hardware's down frame
+ * @xmit_task:		the xmit task for the current LoRaWAN session
+ * @rx_work:		the RX work in workqueue for the current LoRaWAN session
+ * @ndev:		points to the emulating network device
+ * @_net:		the current network namespace of this LoRaWAN hardware
+ */
+struct lrw_struct {
+	struct device dev;
+	struct lrw_hw hw;
+	struct lrw_operations *ops;
+
+	struct sk_buff_head rx_skb_list;
+	struct list_head ss_list;
+	struct mutex ss_list_lock;
+	struct lrw_session *_cur_ss;
+	bool rx_should_ack;
+	u8 state;
+
+	u64 app_eui;
+	u64 dev_eui;
+	u32 devaddr;
+	u8 appkey[LRW_KEY_LEN];
+	u8 nwkskey[LRW_KEY_LEN];
+	u8 appskey[LRW_KEY_LEN];
+	struct crypto_shash *nwks_shash_tfm;
+	struct crypto_skcipher *nwks_skc_tfm;
+	struct crypto_skcipher *apps_skc_tfm;
+
+	u16 fcnt_up;
+	u16 fcnt_down;
+
+	struct tasklet_struct xmit_task;
+	struct work_struct rx_work;
+
+	struct net_device *ndev;
+	possible_net_t _net;
+};
+
+#define	NETDEV_2_LRW(ndev)	((struct lrw_struct *)netdev_priv(ndev))
+
+struct lrw_session * lrw_alloc_ss(struct lrw_struct *);
+void lrw_free_ss(struct lrw_session *);
+void lrw_del_ss(struct lrw_session *);
+int lrw_start_hw(struct lrw_struct *);
+void lrw_stop_hw(struct lrw_struct *);
+void lrw_prepare_tx_frame(struct lrw_session *);
+void lrw_xmit(unsigned long);
+void lrw_rx_work(struct work_struct *);
+
+#endif
-- 
2.19.1