include/linux/dccp.h - kernel/msm-4.19 - Gitiles

 #ifndef _LINUX_DCCP_H
 #define _LINUX_DCCP_H

 #include <linux/types.h>
 #include <asm/byteorder.h>

 /**
  * struct dccp_hdr - generic part of DCCP packet header
  *
  * @dccph_sport - Relevant port on the endpoint that sent this packet
  * @dccph_dport - Relevant port on the other endpoint
  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  * @dccph_ccval - Used by the HC-Sender CCID
  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
  */
 struct dccp_hdr {
 	__u16	dccph_sport,
 		dccph_dport;
 	__u8	dccph_doff;
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	__u8	dccph_cscov:4,
 		dccph_ccval:4;
 #elif defined(__BIG_ENDIAN_BITFIELD)
 	__u8	dccph_ccval:4,
 		dccph_cscov:4;
 #else
 #error  "Adjust your <asm/byteorder.h> defines"
 #endif
 	__u16	dccph_checksum;
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	__u32	dccph_x:1,
 		dccph_type:4,
 		dccph_reserved:3,
 		dccph_seq:24;
 #elif defined(__BIG_ENDIAN_BITFIELD)
 	__u32	dccph_reserved:3,
 		dccph_type:4,
 		dccph_x:1,
 		dccph_seq:24;
 #else
 #error  "Adjust your <asm/byteorder.h> defines"
 #endif
 };

 /**
  * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
  *
  * @dccph_seq_low - low 24 bits of a 48 bit seq packet
  */
 struct dccp_hdr_ext {
 	__u32	dccph_seq_low;
 };

 /**
  * struct dccp_hdr_request - Conection initiation request header
  *
  * @dccph_req_service - Service to which the client app wants to connect
  * @dccph_req_options - list of options (must be a multiple of 32 bits
  */
 struct dccp_hdr_request {
 	__u32	dccph_req_service;
 };
 /**
  * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
  *
  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  */
 struct dccp_hdr_ack_bits {
 	__u32	dccph_reserved1:8,
 		dccph_ack_nr_high:24;
 	__u32	dccph_ack_nr_low;
 };
 /**
  * struct dccp_hdr_response - Conection initiation response header
  *
  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  * @dccph_resp_options - list of options (must be a multiple of 32 bits
  */
 struct dccp_hdr_response {
 	struct dccp_hdr_ack_bits	dccph_resp_ack;
 	__u32				dccph_resp_service;
 };

 /**
  * struct dccp_hdr_reset - Unconditionally shut down a connection
  *
  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
  * @dccph_reset_options - list of options (must be a multiple of 32 bits
  */
 struct dccp_hdr_reset {
 	struct dccp_hdr_ack_bits	dccph_reset_ack;
 	__u8				dccph_reset_code,
 					dccph_reset_data[3];
 };

 enum dccp_pkt_type {
 	DCCP_PKT_REQUEST = 0,
 	DCCP_PKT_RESPONSE,
 	DCCP_PKT_DATA,
 	DCCP_PKT_ACK,
 	DCCP_PKT_DATAACK,
 	DCCP_PKT_CLOSEREQ,
 	DCCP_PKT_CLOSE,
 	DCCP_PKT_RESET,
 	DCCP_PKT_SYNC,
 	DCCP_PKT_SYNCACK,
 	DCCP_PKT_INVALID,
 };

 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID

 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
 {
 	if (type == DCCP_PKT_DATA)
 		return 0;
 	if (type == DCCP_PKT_DATAACK	||
 	    type == DCCP_PKT_ACK	||
 	    type == DCCP_PKT_SYNC	||
 	    type == DCCP_PKT_SYNCACK	||
 	    type == DCCP_PKT_CLOSE	||
 	    type == DCCP_PKT_CLOSEREQ)
 		return sizeof(struct dccp_hdr_ack_bits);
 	if (type == DCCP_PKT_REQUEST)
 		return sizeof(struct dccp_hdr_request);
 	if (type == DCCP_PKT_RESPONSE)
 		return sizeof(struct dccp_hdr_response);
 	return sizeof(struct dccp_hdr_reset);
 }
 enum dccp_reset_codes {
 	DCCP_RESET_CODE_UNSPECIFIED = 0,
 	DCCP_RESET_CODE_CLOSED,
 	DCCP_RESET_CODE_ABORTED,
 	DCCP_RESET_CODE_NO_CONNECTION,
 	DCCP_RESET_CODE_PACKET_ERROR,
 	DCCP_RESET_CODE_OPTION_ERROR,
 	DCCP_RESET_CODE_MANDATORY_ERROR,
 	DCCP_RESET_CODE_CONNECTION_REFUSED,
 	DCCP_RESET_CODE_BAD_SERVICE_CODE,
 	DCCP_RESET_CODE_TOO_BUSY,
 	DCCP_RESET_CODE_BAD_INIT_COOKIE,
 	DCCP_RESET_CODE_AGGRESSION_PENALTY,
 };

 /* DCCP options */
 enum {
 	DCCPO_PADDING = 0,
 	DCCPO_MANDATORY = 1,
 	DCCPO_MIN_RESERVED = 3,
 	DCCPO_MAX_RESERVED = 31,
 	DCCPO_NDP_COUNT = 37,
 	DCCPO_ACK_VECTOR_0 = 38,
 	DCCPO_ACK_VECTOR_1 = 39,
 	DCCPO_TIMESTAMP = 41,
 	DCCPO_TIMESTAMP_ECHO = 42,
 	DCCPO_ELAPSED_TIME = 43,
 	DCCPO_MAX = 45,
 	DCCPO_MIN_CCID_SPECIFIC = 128,
 	DCCPO_MAX_CCID_SPECIFIC = 255,
 };

 /* DCCP features */
 enum {
 	DCCPF_RESERVED = 0,
 	DCCPF_SEQUENCE_WINDOW = 3,
 	DCCPF_SEND_ACK_VECTOR = 6,
 	DCCPF_SEND_NDP_COUNT = 7,
 	/* 10-127 reserved */
 	DCCPF_MIN_CCID_SPECIFIC = 128,
 	DCCPF_MAX_CCID_SPECIFIC = 255,
 };

 /* DCCP socket options */
 #define DCCP_SOCKOPT_PACKET_SIZE	1
 #define DCCP_SOCKOPT_SERVICE		2

 #define DCCP_SERVICE_LIST_MAX_LEN      32

 #ifdef __KERNEL__

 #include <linux/in.h>
 #include <linux/list.h>
 #include <linux/uio.h>
 #include <linux/workqueue.h>

 #include <net/inet_connection_sock.h>
 #include <net/inet_timewait_sock.h>
 #include <net/sock.h>
 #include <net/tcp_states.h>
 #include <net/tcp.h>

 enum dccp_state {
 	DCCP_OPEN	= TCP_ESTABLISHED,
 	DCCP_REQUESTING	= TCP_SYN_SENT,
 	DCCP_PARTOPEN	= TCP_FIN_WAIT1, /* FIXME:
 					    This mapping is horrible, but TCP has
 					    no matching state for DCCP_PARTOPEN,
 					    as TCP_SYN_RECV is already used by
 					    DCCP_RESPOND, why don't stop using TCP
 					    mapping of states? OK, now we don't use
 					    sk_stream_sendmsg anymore, so doesn't
 					    seem to exist any reason for us to
 					    do the TCP mapping here */
 	DCCP_LISTEN	= TCP_LISTEN,
 	DCCP_RESPOND	= TCP_SYN_RECV,
 	DCCP_CLOSING	= TCP_CLOSING,
 	DCCP_TIME_WAIT	= TCP_TIME_WAIT,
 	DCCP_CLOSED	= TCP_CLOSE,
 	DCCP_MAX_STATES = TCP_MAX_STATES,
 };

 #define DCCP_STATE_MASK 0xf
 #define DCCP_ACTION_FIN (1<<7)

 enum {
 	DCCPF_OPEN	 = TCPF_ESTABLISHED,
 	DCCPF_REQUESTING = TCPF_SYN_SENT,
 	DCCPF_PARTOPEN	 = TCPF_FIN_WAIT1,
 	DCCPF_LISTEN	 = TCPF_LISTEN,
 	DCCPF_RESPOND	 = TCPF_SYN_RECV,
 	DCCPF_CLOSING	 = TCPF_CLOSING,
 	DCCPF_TIME_WAIT	 = TCPF_TIME_WAIT,
 	DCCPF_CLOSED	 = TCPF_CLOSE,
 };

 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
 {
 	return (struct dccp_hdr *)skb->h.raw;
 }

 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
 {
 	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
 }

 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
 {
 	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
 }

 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
 {
 	const struct dccp_hdr *dh = dccp_hdr(skb);
 	return __dccp_basic_hdr_len(dh);
 }

 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
 {
 	const struct dccp_hdr *dh = dccp_hdr(skb);
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
 #elif defined(__BIG_ENDIAN_BITFIELD)
 	__u64 seq_nr = ntohl(dh->dccph_seq);
 #else
 #error  "Adjust your <asm/byteorder.h> defines"
 #endif

 	if (dh->dccph_x != 0)
 		seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);

 	return seq_nr;
 }

 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
 {
 	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
 }

 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
 {
 	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
 }

 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
 {
 	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
 #if defined(__LITTLE_ENDIAN_BITFIELD)
 	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
 #elif defined(__BIG_ENDIAN_BITFIELD)
 	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
 #else
 #error  "Adjust your <asm/byteorder.h> defines"
 #endif
 }

 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
 {
 	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
 }

 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
 {
 	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
 }

 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
 {
 	return __dccp_basic_hdr_len(dh) +
 	       dccp_packet_hdr_len(dh->dccph_type);
 }

 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
 {
 	return __dccp_hdr_len(dccp_hdr(skb));
 }


 /* initial values for each feature */
 #define DCCPF_INITIAL_SEQUENCE_WINDOW		100
 /* FIXME: for now we're using CCID 3 (TFRC) */
 #define DCCPF_INITIAL_CCID			3
 #define DCCPF_INITIAL_SEND_ACK_VECTOR		0
 /* FIXME: for now we're default to 1 but it should really be 0 */
 #define DCCPF_INITIAL_SEND_NDP_COUNT		1

 #define DCCP_NDP_LIMIT 0xFFFFFF

 /**
   * struct dccp_options - option values for a DCCP connection
   *	@dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
   *	@dccpo_ccid - Congestion Control Id (CCID) (section 10)
   *	@dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
   *	@dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
   */
 struct dccp_options {
 	__u64	dccpo_sequence_window;
 	__u8	dccpo_rx_ccid;
 	__u8	dccpo_tx_ccid;
 	__u8	dccpo_send_ack_vector;
 	__u8	dccpo_send_ndp_count;
 };

 extern void __dccp_options_init(struct dccp_options *dccpo);
 extern void dccp_options_init(struct dccp_options *dccpo);
 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);

 struct dccp_request_sock {
 	struct inet_request_sock dreq_inet_rsk;
 	__u64			 dreq_iss;
 	__u64			 dreq_isr;
 	__u32			 dreq_service;
 };

 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
 {
 	return (struct dccp_request_sock *)req;
 }

 extern struct inet_timewait_death_row dccp_death_row;

 struct dccp_options_received {
 	u32	dccpor_ndp; /* only 24 bits */
 	u32	dccpor_timestamp;
 	u32	dccpor_timestamp_echo;
 	u32	dccpor_elapsed_time;
 };

 struct ccid;

 enum dccp_role {
 	DCCP_ROLE_UNDEFINED,
 	DCCP_ROLE_LISTEN,
 	DCCP_ROLE_CLIENT,
 	DCCP_ROLE_SERVER,
 };

 struct dccp_service_list {
 	__u32	dccpsl_nr;
 	__u32	dccpsl_list[0];
 };

 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)

 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
 					const u32 service)
 {
 	if (likely(sl != NULL)) {
 		u32 i = sl->dccpsl_nr;
 		while (i--)
 			if (sl->dccpsl_list[i] == service)
 				return 1;
 	}
 	return 0;
 }

 struct dccp_ackvec;

 /**
  * struct dccp_sock - DCCP socket state
  *
  * @dccps_swl - sequence number window low
  * @dccps_swh - sequence number window high
  * @dccps_awl - acknowledgement number window low
  * @dccps_awh - acknowledgement number window high
  * @dccps_iss - initial sequence number sent
  * @dccps_isr - initial sequence number received
  * @dccps_osr - first OPEN sequence number received
  * @dccps_gss - greatest sequence number sent
  * @dccps_gsr - greatest valid sequence number received
  * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
  * @dccps_timestamp_time - time of latest TIMESTAMP option
  * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
  * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
  * @dccps_pmtu_cookie - Last pmtu seen by socket
  * @dccps_packet_size - Set thru setsockopt
  * @dccps_role - Role of this sock, one of %dccp_role
  * @dccps_ndp_count - number of Non Data Packets since last data packet
  * @dccps_hc_rx_ackvec - rx half connection ack vector
  */
 struct dccp_sock {
 	/* inet_connection_sock has to be the first member of dccp_sock */
 	struct inet_connection_sock	dccps_inet_connection;
 	__u64				dccps_swl;
 	__u64				dccps_swh;
 	__u64				dccps_awl;
 	__u64				dccps_awh;
 	__u64				dccps_iss;
 	__u64				dccps_isr;
 	__u64				dccps_osr;
 	__u64				dccps_gss;
 	__u64				dccps_gsr;
 	__u64				dccps_gar;
 	__u32				dccps_service;
 	struct dccp_service_list	*dccps_service_list;
 	struct timeval			dccps_timestamp_time;
 	__u32				dccps_timestamp_echo;
 	__u32				dccps_packet_size;
 	unsigned long			dccps_ndp_count;
 	__u16				dccps_ext_header_len;
 	__u32				dccps_pmtu_cookie;
 	__u32				dccps_mss_cache;
 	struct dccp_options		dccps_options;
 	struct dccp_ackvec		*dccps_hc_rx_ackvec;
 	void				*dccps_hc_rx_ccid_private;
 	void				*dccps_hc_tx_ccid_private;
 	struct ccid			*dccps_hc_rx_ccid;
 	struct ccid			*dccps_hc_tx_ccid;
 	struct dccp_options_received	dccps_options_received;
 	struct timeval			dccps_epoch;
 	enum dccp_role			dccps_role:2;
 	__u8				dccps_hc_rx_insert_options:1;
 	__u8				dccps_hc_tx_insert_options:1;
 };

 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
 {
 	return (struct dccp_sock *)sk;
 }

 static inline int dccp_service_not_initialized(const struct sock *sk)
 {
 	return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
 }

 static inline const char *dccp_role(const struct sock *sk)
 {
 	switch (dccp_sk(sk)->dccps_role) {
 	case DCCP_ROLE_UNDEFINED: return "undefined";
 	case DCCP_ROLE_LISTEN:	  return "listen";
 	case DCCP_ROLE_SERVER:	  return "server";
 	case DCCP_ROLE_CLIENT:	  return "client";
 	}
 	return NULL;
 }

 #endif /* __KERNEL__ */

 #endif /* _LINUX_DCCP_H */
	#ifndef _LINUX_DCCP_H
	#define _LINUX_DCCP_H

	#include <linux/types.h>
	#include <asm/byteorder.h>

	/**
	* struct dccp_hdr - generic part of DCCP packet header
	*
	* @dccph_sport - Relevant port on the endpoint that sent this packet
	* @dccph_dport - Relevant port on the other endpoint
	* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
	* @dccph_ccval - Used by the HC-Sender CCID
	* @dccph_cscov - Parts of the packet that are covered by the Checksum field
	* @dccph_checksum - Internet checksum, depends on dccph_cscov
	* @dccph_x - 0 = 24 bit sequence number, 1 = 48
	* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
	* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
	*/
	struct dccp_hdr {
	__u16 dccph_sport,
	dccph_dport;
	__u8 dccph_doff;
	#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8 dccph_cscov:4,
	dccph_ccval:4;
	#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8 dccph_ccval:4,
	dccph_cscov:4;
	#else
	#error "Adjust your <asm/byteorder.h> defines"
	#endif
	__u16 dccph_checksum;
	#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u32 dccph_x:1,
	dccph_type:4,
	dccph_reserved:3,
	dccph_seq:24;
	#elif defined(__BIG_ENDIAN_BITFIELD)
	__u32 dccph_reserved:3,
	dccph_type:4,
	dccph_x:1,
	dccph_seq:24;
	#else
	#error "Adjust your <asm/byteorder.h> defines"
	#endif
	};

	/**
	* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
	*
	* @dccph_seq_low - low 24 bits of a 48 bit seq packet
	*/
	struct dccp_hdr_ext {
	__u32 dccph_seq_low;
	};

	/**
	* struct dccp_hdr_request - Conection initiation request header
	*
	* @dccph_req_service - Service to which the client app wants to connect
	* @dccph_req_options - list of options (must be a multiple of 32 bits
	*/
	struct dccp_hdr_request {
	__u32 dccph_req_service;
	};
	/**
	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	*
	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	*/
	struct dccp_hdr_ack_bits {
	__u32 dccph_reserved1:8,
	dccph_ack_nr_high:24;
	__u32 dccph_ack_nr_low;
	};
	/**
	* struct dccp_hdr_response - Conection initiation response header
	*
	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
	* @dccph_resp_options - list of options (must be a multiple of 32 bits
	*/
	struct dccp_hdr_response {
	struct dccp_hdr_ack_bits dccph_resp_ack;
	__u32 dccph_resp_service;
	};

	/**
	* struct dccp_hdr_reset - Unconditionally shut down a connection
	*
	* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
	* @dccph_reset_options - list of options (must be a multiple of 32 bits
	*/
	struct dccp_hdr_reset {
	struct dccp_hdr_ack_bits dccph_reset_ack;
	__u8 dccph_reset_code,
	dccph_reset_data[3];
	};

	enum dccp_pkt_type {
	DCCP_PKT_REQUEST = 0,
	DCCP_PKT_RESPONSE,
	DCCP_PKT_DATA,
	DCCP_PKT_ACK,
	DCCP_PKT_DATAACK,
	DCCP_PKT_CLOSEREQ,
	DCCP_PKT_CLOSE,
	DCCP_PKT_RESET,
	DCCP_PKT_SYNC,
	DCCP_PKT_SYNCACK,
	DCCP_PKT_INVALID,
	};

	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID

	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	{
	if (type == DCCP_PKT_DATA)
	return 0;
	if (type == DCCP_PKT_DATAACK \|\|
	type == DCCP_PKT_ACK \|\|
	type == DCCP_PKT_SYNC \|\|
	type == DCCP_PKT_SYNCACK \|\|
	type == DCCP_PKT_CLOSE \|\|
	type == DCCP_PKT_CLOSEREQ)
	return sizeof(struct dccp_hdr_ack_bits);
	if (type == DCCP_PKT_REQUEST)
	return sizeof(struct dccp_hdr_request);
	if (type == DCCP_PKT_RESPONSE)
	return sizeof(struct dccp_hdr_response);
	return sizeof(struct dccp_hdr_reset);
	}
	enum dccp_reset_codes {
	DCCP_RESET_CODE_UNSPECIFIED = 0,
	DCCP_RESET_CODE_CLOSED,
	DCCP_RESET_CODE_ABORTED,
	DCCP_RESET_CODE_NO_CONNECTION,
	DCCP_RESET_CODE_PACKET_ERROR,
	DCCP_RESET_CODE_OPTION_ERROR,
	DCCP_RESET_CODE_MANDATORY_ERROR,
	DCCP_RESET_CODE_CONNECTION_REFUSED,
	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	DCCP_RESET_CODE_TOO_BUSY,
	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	DCCP_RESET_CODE_AGGRESSION_PENALTY,
	};

	/* DCCP options */
	enum {
	DCCPO_PADDING = 0,
	DCCPO_MANDATORY = 1,
	DCCPO_MIN_RESERVED = 3,
	DCCPO_MAX_RESERVED = 31,
	DCCPO_NDP_COUNT = 37,
	DCCPO_ACK_VECTOR_0 = 38,
	DCCPO_ACK_VECTOR_1 = 39,
	DCCPO_TIMESTAMP = 41,
	DCCPO_TIMESTAMP_ECHO = 42,
	DCCPO_ELAPSED_TIME = 43,
	DCCPO_MAX = 45,
	DCCPO_MIN_CCID_SPECIFIC = 128,
	DCCPO_MAX_CCID_SPECIFIC = 255,
	};

	/* DCCP features */
	enum {
	DCCPF_RESERVED = 0,
	DCCPF_SEQUENCE_WINDOW = 3,
	DCCPF_SEND_ACK_VECTOR = 6,
	DCCPF_SEND_NDP_COUNT = 7,
	/* 10-127 reserved */
	DCCPF_MIN_CCID_SPECIFIC = 128,
	DCCPF_MAX_CCID_SPECIFIC = 255,
	};

	/* DCCP socket options */
	#define DCCP_SOCKOPT_PACKET_SIZE 1
	#define DCCP_SOCKOPT_SERVICE 2

	#define DCCP_SERVICE_LIST_MAX_LEN 32

	#ifdef __KERNEL__

	#include <linux/in.h>
	#include <linux/list.h>
	#include <linux/uio.h>
	#include <linux/workqueue.h>

	#include <net/inet_connection_sock.h>
	#include <net/inet_timewait_sock.h>
	#include <net/sock.h>
	#include <net/tcp_states.h>
	#include <net/tcp.h>

	enum dccp_state {
	DCCP_OPEN = TCP_ESTABLISHED,
	DCCP_REQUESTING = TCP_SYN_SENT,
	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	This mapping is horrible, but TCP has
	no matching state for DCCP_PARTOPEN,
	as TCP_SYN_RECV is already used by
	DCCP_RESPOND, why don't stop using TCP
	mapping of states? OK, now we don't use
	sk_stream_sendmsg anymore, so doesn't
	seem to exist any reason for us to
	do the TCP mapping here */
	DCCP_LISTEN = TCP_LISTEN,
	DCCP_RESPOND = TCP_SYN_RECV,
	DCCP_CLOSING = TCP_CLOSING,
	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	DCCP_CLOSED = TCP_CLOSE,
	DCCP_MAX_STATES = TCP_MAX_STATES,
	};

	#define DCCP_STATE_MASK 0xf
	#define DCCP_ACTION_FIN (1<<7)

	enum {
	DCCPF_OPEN = TCPF_ESTABLISHED,
	DCCPF_REQUESTING = TCPF_SYN_SENT,
	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	DCCPF_LISTEN = TCPF_LISTEN,
	DCCPF_RESPOND = TCPF_SYN_RECV,
	DCCPF_CLOSING = TCPF_CLOSING,
	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	DCCPF_CLOSED = TCPF_CLOSE,
	};

	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	{
	return (struct dccp_hdr *)skb->h.raw;
	}

	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
	{
	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
	}

	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	{
	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	}

	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	{
	const struct dccp_hdr *dh = dccp_hdr(skb);
	return __dccp_basic_hdr_len(dh);
	}

	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	{
	const struct dccp_hdr *dh = dccp_hdr(skb);
	#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
	#elif defined(__BIG_ENDIAN_BITFIELD)
	__u64 seq_nr = ntohl(dh->dccph_seq);
	#else
	#error "Adjust your <asm/byteorder.h> defines"
	#endif

	if (dh->dccph_x != 0)
	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);

	return seq_nr;
	}

	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	{
	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
	}

	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	{
	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
	}

	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	{
	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	#if defined(__LITTLE_ENDIAN_BITFIELD)
	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	#elif defined(__BIG_ENDIAN_BITFIELD)
	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	#else
	#error "Adjust your <asm/byteorder.h> defines"
	#endif
	}

	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	{
	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
	}

	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	{
	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
	}

	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	{
	return __dccp_basic_hdr_len(dh) +
	dccp_packet_hdr_len(dh->dccph_type);
	}

	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
	{
	return __dccp_hdr_len(dccp_hdr(skb));
	}


	/* initial values for each feature */
	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
	/* FIXME: for now we're using CCID 3 (TFRC) */
	#define DCCPF_INITIAL_CCID 3
	#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
	/* FIXME: for now we're default to 1 but it should really be 0 */
	#define DCCPF_INITIAL_SEND_NDP_COUNT 1

	#define DCCP_NDP_LIMIT 0xFFFFFF

	/**
	* struct dccp_options - option values for a DCCP connection
	* @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
	* @dccpo_ccid - Congestion Control Id (CCID) (section 10)
	* @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
	* @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
	*/
	struct dccp_options {
	__u64 dccpo_sequence_window;
	__u8 dccpo_rx_ccid;
	__u8 dccpo_tx_ccid;
	__u8 dccpo_send_ack_vector;
	__u8 dccpo_send_ndp_count;
	};

	extern void __dccp_options_init(struct dccp_options *dccpo);
	extern void dccp_options_init(struct dccp_options *dccpo);
	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);

	struct dccp_request_sock {
	struct inet_request_sock dreq_inet_rsk;
	__u64 dreq_iss;
	__u64 dreq_isr;
	__u32 dreq_service;
	};

	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	{
	return (struct dccp_request_sock *)req;
	}

	extern struct inet_timewait_death_row dccp_death_row;

	struct dccp_options_received {
	u32 dccpor_ndp; /* only 24 bits */
	u32 dccpor_timestamp;
	u32 dccpor_timestamp_echo;
	u32 dccpor_elapsed_time;
	};

	struct ccid;

	enum dccp_role {
	DCCP_ROLE_UNDEFINED,
	DCCP_ROLE_LISTEN,
	DCCP_ROLE_CLIENT,
	DCCP_ROLE_SERVER,
	};

	struct dccp_service_list {
	__u32 dccpsl_nr;
	__u32 dccpsl_list[0];
	};

	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)

	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
	const u32 service)
	{
	if (likely(sl != NULL)) {
	u32 i = sl->dccpsl_nr;
	while (i--)
	if (sl->dccpsl_list[i] == service)
	return 1;
	}
	return 0;
	}

	struct dccp_ackvec;

	/**
	* struct dccp_sock - DCCP socket state
	*
	* @dccps_swl - sequence number window low
	* @dccps_swh - sequence number window high
	* @dccps_awl - acknowledgement number window low
	* @dccps_awh - acknowledgement number window high
	* @dccps_iss - initial sequence number sent
	* @dccps_isr - initial sequence number received
	* @dccps_osr - first OPEN sequence number received
	* @dccps_gss - greatest sequence number sent
	* @dccps_gsr - greatest valid sequence number received
	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
	* @dccps_timestamp_time - time of latest TIMESTAMP option
	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
	* @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
	* @dccps_pmtu_cookie - Last pmtu seen by socket
	* @dccps_packet_size - Set thru setsockopt
	* @dccps_role - Role of this sock, one of %dccp_role
	* @dccps_ndp_count - number of Non Data Packets since last data packet
	* @dccps_hc_rx_ackvec - rx half connection ack vector
	*/
	struct dccp_sock {
	/* inet_connection_sock has to be the first member of dccp_sock */
	struct inet_connection_sock dccps_inet_connection;
	__u64 dccps_swl;
	__u64 dccps_swh;
	__u64 dccps_awl;
	__u64 dccps_awh;
	__u64 dccps_iss;
	__u64 dccps_isr;
	__u64 dccps_osr;
	__u64 dccps_gss;
	__u64 dccps_gsr;
	__u64 dccps_gar;
	__u32 dccps_service;
	struct dccp_service_list *dccps_service_list;
	struct timeval dccps_timestamp_time;
	__u32 dccps_timestamp_echo;
	__u32 dccps_packet_size;
	unsigned long dccps_ndp_count;
	__u16 dccps_ext_header_len;
	__u32 dccps_pmtu_cookie;
	__u32 dccps_mss_cache;
	struct dccp_options dccps_options;
	struct dccp_ackvec *dccps_hc_rx_ackvec;
	void *dccps_hc_rx_ccid_private;
	void *dccps_hc_tx_ccid_private;
	struct ccid *dccps_hc_rx_ccid;
	struct ccid *dccps_hc_tx_ccid;
	struct dccp_options_received dccps_options_received;
	struct timeval dccps_epoch;
	enum dccp_role dccps_role:2;
	__u8 dccps_hc_rx_insert_options:1;
	__u8 dccps_hc_tx_insert_options:1;
	};

	static inline struct dccp_sock dccp_sk(const struct sock sk)
	{
	return (struct dccp_sock *)sk;
	}

	static inline int dccp_service_not_initialized(const struct sock *sk)
	{
	return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
	}

	static inline const char dccp_role(const struct sock sk)
	{
	switch (dccp_sk(sk)->dccps_role) {
	case DCCP_ROLE_UNDEFINED: return "undefined";
	case DCCP_ROLE_LISTEN: return "listen";
	case DCCP_ROLE_SERVER: return "server";
	case DCCP_ROLE_CLIENT: return "client";
	}
	return NULL;
	}

	#endif /* __KERNEL__ */

	#endif /* _LINUX_DCCP_H */