/*
   * An interface between IEEE802.15.4 device and rest of the kernel.
   *
   * Copyright (C) 2007-2012 Siemens AG
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2
   * as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * Written by:
   * Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
   * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
   * Maxim Osipov <maxim.osipov@siemens.com>
   * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
   * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   */
  
  #ifndef IEEE802154_NETDEVICE_H
  #define IEEE802154_NETDEVICE_H
  
  #include <net/af_ieee802154.h>
  #include <linux/netdevice.h>
  #include <linux/skbuff.h>
  #include <linux/ieee802154.h>
  
  #include <net/cfg802154.h>
  
  struct ieee802154_sechdr {
  #if defined(__LITTLE_ENDIAN_BITFIELD)
  	u8 level:3,
  	   key_id_mode:2,
  	   reserved:3;
  #elif defined(__BIG_ENDIAN_BITFIELD)
  	u8 reserved:3,
  	   key_id_mode:2,
  	   level:3;
  #else
  #error	"Please fix <asm/byteorder.h>"
  #endif
  	u8 key_id;
  	__le32 frame_counter;
  	union {
  		__le32 short_src;
  		__le64 extended_src;
  	};
  };
  
  struct ieee802154_hdr_fc {
  #if defined(__LITTLE_ENDIAN_BITFIELD)
  	u16 type:3,
  	    security_enabled:1,
  	    frame_pending:1,
  	    ack_request:1,
  	    intra_pan:1,
  	    reserved:3,
  	    dest_addr_mode:2,
  	    version:2,
  	    source_addr_mode:2;
  #elif defined(__BIG_ENDIAN_BITFIELD)
  	u16 reserved:1,
  	    intra_pan:1,
  	    ack_request:1,
  	    frame_pending:1,
  	    security_enabled:1,
  	    type:3,
  	    source_addr_mode:2,
  	    version:2,
  	    dest_addr_mode:2,
  	    reserved2:2;
  #else
  #error	"Please fix <asm/byteorder.h>"
  #endif
  };
  
  struct ieee802154_hdr {
  	struct ieee802154_hdr_fc fc;
  	u8 seq;
  	struct ieee802154_addr source;
  	struct ieee802154_addr dest;
  	struct ieee802154_sechdr sec;
  };
  
  /* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
   * the contents of hdr will be, and the actual value of those bits in
   * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
   * version, if SECEN is set.
   */
  int ieee802154_hdr_push(struct sk_buff *skb, struct ieee802154_hdr *hdr);
  
  /* pulls the entire 802.15.4 header off of the skb, including the security
   * header, and performs pan id decompression
   */
  int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
  
  /* parses the frame control, sequence number of address fields in a given skb
   * and stores them into hdr, performing pan id decompression and length checks
   * to be suitable for use in header_ops.parse
   */
  int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
  			      struct ieee802154_hdr *hdr);
  
  /* parses the full 802.15.4 header a given skb and stores them into hdr,
   * performing pan id decompression and length checks to be suitable for use in
   * header_ops.parse
   */
  int ieee802154_hdr_peek(const struct sk_buff *skb, struct ieee802154_hdr *hdr);
  
  int ieee802154_max_payload(const struct ieee802154_hdr *hdr);
  
  static inline int
  ieee802154_sechdr_authtag_len(const struct ieee802154_sechdr *sec)
  {
  	switch (sec->level) {
  	case IEEE802154_SCF_SECLEVEL_MIC32:
  	case IEEE802154_SCF_SECLEVEL_ENC_MIC32:
  		return 4;
  	case IEEE802154_SCF_SECLEVEL_MIC64:
  	case IEEE802154_SCF_SECLEVEL_ENC_MIC64:
  		return 8;
  	case IEEE802154_SCF_SECLEVEL_MIC128:
  	case IEEE802154_SCF_SECLEVEL_ENC_MIC128:
  		return 16;
  	case IEEE802154_SCF_SECLEVEL_NONE:
  	case IEEE802154_SCF_SECLEVEL_ENC:
  	default:
  		return 0;
  	}
  }
  
  static inline int ieee802154_hdr_length(struct sk_buff *skb)
  {
  	struct ieee802154_hdr hdr;
  	int len = ieee802154_hdr_pull(skb, &hdr);
  
  	if (len > 0)
  		skb_push(skb, len);
  
  	return len;
  }
  
  static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
  					 const struct ieee802154_addr *a2)
  {
  	if (a1->pan_id != a2->pan_id || a1->mode != a2->mode)
  		return false;
  
  	if ((a1->mode == IEEE802154_ADDR_LONG &&
  	     a1->extended_addr != a2->extended_addr) ||
  	    (a1->mode == IEEE802154_ADDR_SHORT &&
  	     a1->short_addr != a2->short_addr))
  		return false;
  
  	return true;
  }
  
  static inline __le64 ieee802154_devaddr_from_raw(const void *raw)
  {
  	u64 temp;
  
  	memcpy(&temp, raw, IEEE802154_ADDR_LEN);
  	return (__force __le64)swab64(temp);
  }
  
  static inline void ieee802154_devaddr_to_raw(void *raw, __le64 addr)
  {
  	u64 temp = swab64((__force u64)addr);
  
  	memcpy(raw, &temp, IEEE802154_ADDR_LEN);
  }
  
  static inline void ieee802154_addr_from_sa(struct ieee802154_addr *a,
  					   const struct ieee802154_addr_sa *sa)
  {
  	a->mode = sa->addr_type;
  	a->pan_id = cpu_to_le16(sa->pan_id);
  
  	switch (a->mode) {
  	case IEEE802154_ADDR_SHORT:
  		a->short_addr = cpu_to_le16(sa->short_addr);
  		break;
  	case IEEE802154_ADDR_LONG:
  		a->extended_addr = ieee802154_devaddr_from_raw(sa->hwaddr);
  		break;
  	}
  }
  
  static inline void ieee802154_addr_to_sa(struct ieee802154_addr_sa *sa,
  					 const struct ieee802154_addr *a)
  {
  	sa->addr_type = a->mode;
  	sa->pan_id = le16_to_cpu(a->pan_id);
  
  	switch (a->mode) {
  	case IEEE802154_ADDR_SHORT:
  		sa->short_addr = le16_to_cpu(a->short_addr);
  		break;
  	case IEEE802154_ADDR_LONG:
  		ieee802154_devaddr_to_raw(sa->hwaddr, a->extended_addr);
  		break;
  	}
  }
  
  /*
   * A control block of skb passed between the ARPHRD_IEEE802154 device
   * and other stack parts.
   */
  struct ieee802154_mac_cb {
  	u8 lqi;
  	u8 type;
  	bool ackreq;
  	bool secen;
  	bool secen_override;
  	u8 seclevel;
  	bool seclevel_override;
  	struct ieee802154_addr source;
  	struct ieee802154_addr dest;
  };
  
  static inline struct ieee802154_mac_cb *mac_cb(struct sk_buff *skb)
  {
  	return (struct ieee802154_mac_cb *)skb->cb;
  }
  
  static inline struct ieee802154_mac_cb *mac_cb_init(struct sk_buff *skb)
  {
  	BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
  
  	memset(skb->cb, 0, sizeof(struct ieee802154_mac_cb));
  	return mac_cb(skb);
  }
  
  enum {
  	IEEE802154_LLSEC_DEVKEY_IGNORE,
  	IEEE802154_LLSEC_DEVKEY_RESTRICT,
  	IEEE802154_LLSEC_DEVKEY_RECORD,
  
  	__IEEE802154_LLSEC_DEVKEY_MAX,
  };
  
  #define IEEE802154_MAC_SCAN_ED		0
  #define IEEE802154_MAC_SCAN_ACTIVE	1
  #define IEEE802154_MAC_SCAN_PASSIVE	2
  #define IEEE802154_MAC_SCAN_ORPHAN	3
  
  struct ieee802154_mac_params {
  	s8 transmit_power;
  	u8 min_be;
  	u8 max_be;
  	u8 csma_retries;
  	s8 frame_retries;
  
  	bool lbt;
  	struct wpan_phy_cca cca;
  	s32 cca_ed_level;
  };
  
  struct wpan_phy;
  
  enum {
  	IEEE802154_LLSEC_PARAM_ENABLED		= BIT(0),
  	IEEE802154_LLSEC_PARAM_FRAME_COUNTER	= BIT(1),
  	IEEE802154_LLSEC_PARAM_OUT_LEVEL	= BIT(2),
  	IEEE802154_LLSEC_PARAM_OUT_KEY		= BIT(3),
  	IEEE802154_LLSEC_PARAM_KEY_SOURCE	= BIT(4),
  	IEEE802154_LLSEC_PARAM_PAN_ID		= BIT(5),
  	IEEE802154_LLSEC_PARAM_HWADDR		= BIT(6),
  	IEEE802154_LLSEC_PARAM_COORD_HWADDR	= BIT(7),
  	IEEE802154_LLSEC_PARAM_COORD_SHORTADDR	= BIT(8),
  };
  
  struct ieee802154_llsec_ops {
  	int (*get_params)(struct net_device *dev,
  			  struct ieee802154_llsec_params *params);
  	int (*set_params)(struct net_device *dev,
  			  const struct ieee802154_llsec_params *params,
  			  int changed);
  
  	int (*add_key)(struct net_device *dev,
  		       const struct ieee802154_llsec_key_id *id,
  		       const struct ieee802154_llsec_key *key);
  	int (*del_key)(struct net_device *dev,
  		       const struct ieee802154_llsec_key_id *id);
  
  	int (*add_dev)(struct net_device *dev,
  		       const struct ieee802154_llsec_device *llsec_dev);
  	int (*del_dev)(struct net_device *dev, __le64 dev_addr);
  
  	int (*add_devkey)(struct net_device *dev,
  			  __le64 device_addr,
  			  const struct ieee802154_llsec_device_key *key);
  	int (*del_devkey)(struct net_device *dev,
  			  __le64 device_addr,
  			  const struct ieee802154_llsec_device_key *key);
  
  	int (*add_seclevel)(struct net_device *dev,
  			    const struct ieee802154_llsec_seclevel *sl);
  	int (*del_seclevel)(struct net_device *dev,
  			    const struct ieee802154_llsec_seclevel *sl);
  
  	void (*lock_table)(struct net_device *dev);
  	void (*get_table)(struct net_device *dev,
  			  struct ieee802154_llsec_table **t);
  	void (*unlock_table)(struct net_device *dev);
  };
  /*
   * This should be located at net_device->ml_priv
   *
   * get_phy should increment the reference counting on returned phy.
   * Use wpan_wpy_put to put that reference.
   */
  struct ieee802154_mlme_ops {
  	/* The following fields are optional (can be NULL). */
  
  	int (*assoc_req)(struct net_device *dev,
  			struct ieee802154_addr *addr,
  			u8 channel, u8 page, u8 cap);
  	int (*assoc_resp)(struct net_device *dev,
  			struct ieee802154_addr *addr,
  			__le16 short_addr, u8 status);
  	int (*disassoc_req)(struct net_device *dev,
  			struct ieee802154_addr *addr,
  			u8 reason);
  	int (*start_req)(struct net_device *dev,
  			struct ieee802154_addr *addr,
  			u8 channel, u8 page, u8 bcn_ord, u8 sf_ord,
  			u8 pan_coord, u8 blx, u8 coord_realign);
  	int (*scan_req)(struct net_device *dev,
  			u8 type, u32 channels, u8 page, u8 duration);
  
  	int (*set_mac_params)(struct net_device *dev,
  			      const struct ieee802154_mac_params *params);
  	void (*get_mac_params)(struct net_device *dev,
  			       struct ieee802154_mac_params *params);
  
  	struct ieee802154_llsec_ops *llsec;
  };
  
  static inline struct ieee802154_mlme_ops *
  ieee802154_mlme_ops(const struct net_device *dev)
  {
  	return dev->ml_priv;
  }
  
  #endif