#ifndef __KMOD_CAPWAP_HEADER__
#define __KMOD_CAPWAP_HEADER__

#include "capwap_rfc.h"
#include "socket.h"

/* */
#define MAX_MTU						9000
#define DEFAULT_MTU 				1450
#define MIN_MTU						500
#define IEEE80211_MTU				7981

/* */
#define CAPWAP_FRAGMENT_QUEUE		16

/* */
#define CAPWAP_FRAGMENT_ENABLE		0x0001
#define CAPWAP_FRAGMENT_LRUQUEUE	0x0002
#define CAPWAP_FRAGMENT_LAST		0x0004

/* */
#define SKB_CAPWAP_FLAG_FROM_DATA_CHANNEL			0x0001
#define SKB_CAPWAP_FLAG_FROM_USER_SPACE				0x0002
#define SKB_CAPWAP_FLAG_FROM_IEEE80211				0x0004

#define SKB_CAPWAP_FLAG_PEERADDRESS					0x0010
#define SKB_CAPWAP_FLAG_RADIOID						0x0020
#define SKB_CAPWAP_FLAG_BINDING						0x0040
#define SKB_CAPWAP_FLAG_RADIOADDRESS				0x0080
#define SKB_CAPWAP_FLAG_WIRELESSINFORMATION			0x0100

#define SKB_CAPWAP_FLAG_FRAGMENT					0x1000

struct sc_skb_capwap_cb {
	uint16_t flags;
	struct capwap_addr_little peeraddr;

	/* Capwap information */
	uint8_t radioid;
	uint8_t binding;

	/* Radio Address */
	uint8_t radioaddr_addr[MACADDRESS_EUI48_LENGTH];

	/* Wireless Information */
	uint8_t winfo_rssi;
	uint8_t winfo_snr;
	uint16_t winfo_rate;

	/* Fragment */
	uint16_t frag_offset;
	uint16_t frag_length;
};

#define CAPWAP_SKB_CB(skb)					((struct sc_skb_capwap_cb*)((skb)->cb))

/* */
struct sc_capwap_fragment {
	struct list_head lru_list;

	uint8_t flags;
	ktime_t tstamp;

	uint16_t fragmentid;

	struct sk_buff* fragments;
	struct sk_buff* lastfragment;
	int recvlength;
	int totallength;
};

/* */
struct sc_capwap_fragment_queue {
	spinlock_t lock;

	struct list_head lru_list;
	struct sc_capwap_fragment queues[CAPWAP_FRAGMENT_QUEUE];
};

/* */
struct sc_capwap_session {
	struct list_head list;
	struct sc_capwap_session* __rcu next;

	uint16_t mtu;
	union capwap_addr peeraddr;
	struct sc_capwap_sessionid_element sessionid;

	uint16_t fragmentid;
	spinlock_t fragmentid_lock;

	struct sc_capwap_fragment_queue fragments;
};

/* */
extern union capwap_addr sc_localaddr;

/* Dipendent implementation function */
void sc_capwap_recvpacket(struct sk_buff* skb);
struct sc_capwap_session* sc_capwap_recvunknownkeepalive(const union capwap_addr* sockaddr, struct sc_capwap_sessionid_element* sessionid);

void sc_capwap_parsingdatapacket(struct sc_capwap_session* session, struct sk_buff* skb);
void sc_capwap_parsingmgmtpacket(struct sc_capwap_session* session, struct sk_buff* skb);

/* Indipendent implementation function */
int sc_capwap_bind(union capwap_addr* sockaddr);

void sc_capwap_initsession(struct sc_capwap_session* session);
void sc_capwap_freesession(struct sc_capwap_session* session);
uint16_t sc_capwap_newfragmentid(struct sc_capwap_session* session);

void sc_capwap_sessionid_printf(const struct sc_capwap_sessionid_element* sessionid, char* string);

struct sc_capwap_packet* sc_capwap_poppacketqueue(struct sc_capwap_session* session);
void sc_capwap_pushpacketqueue(struct sc_capwap_session* session, struct sc_capwap_packet* packet);

int sc_capwap_createkeepalive(struct sc_capwap_sessionid_element* sessionid, uint8_t* buffer, int size);
int sc_capwap_parsingpacket(struct sc_capwap_session* session, const union capwap_addr* sockaddr, struct sk_buff* skb);

struct sc_capwap_radio_addr* sc_capwap_setradiomacaddress(uint8_t* buffer, int size, uint8_t* bssid);
struct sc_capwap_wireless_information* sc_capwap_setwirelessinformation(uint8_t* buffer, int size, uint8_t rssi, uint8_t snr, uint16_t rate);

int sc_capwap_forwarddata(struct sc_capwap_session* session, uint8_t radioid, uint8_t binding, struct sk_buff* skb, uint32_t flags, struct sc_capwap_radio_addr* radioaddr, int radioaddrlength, struct sc_capwap_wireless_information* winfo, int winfolength);

/* Private funciotn */
#include "capwap_private.h"

#endif /* __KMOD_CAPWAP_HEADER__ */