[deliverable/linux.git] / include / 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 {
	__be16	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)
	__u8	dccph_x:1,
		dccph_type:4,
		dccph_reserved:3;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8	dccph_reserved:3,
		dccph_type:4,
		dccph_x:1;
#else
#error  "Adjust your <asm/byteorder.h> defines"
#endif
	__u8	dccph_seq2;
	__be16	dccph_seq;
};

/**
 * 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 {
	__be32	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 {
	__be32	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 {
	__be16	dccph_reserved1;
	__be16	dccph_ack_nr_high;
	__be32	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;
	__be32				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_CHANGE_L = 32,
	DCCPO_CONFIRM_L = 33,
	DCCPO_CHANGE_R = 34,
	DCCPO_CONFIRM_R = 35,
	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_CCID = 1,
	DCCPF_SEQUENCE_WINDOW = 3,
	DCCPF_ACK_RATIO = 5,
	DCCPF_SEND_ACK_VECTOR = 6,
	DCCPF_SEND_NDP_COUNT = 7,
	/* 10-127 reserved */
	DCCPF_MIN_CCID_SPECIFIC = 128,
	DCCPF_MAX_CCID_SPECIFIC = 255,
};

/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
struct dccp_so_feat {
	__u8 dccpsf_feat;
	__u8 *dccpsf_val;
	__u8 dccpsf_len;
};

/* DCCP socket options */
#define DCCP_SOCKOPT_PACKET_SIZE	1
#define DCCP_SOCKOPT_SERVICE		2
#define DCCP_SOCKOPT_CHANGE_L		3
#define DCCP_SOCKOPT_CHANGE_R		4
#define DCCP_SOCKOPT_CCID_RX_INFO	128
#define DCCP_SOCKOPT_CCID_TX_INFO	192

#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_sock.h>
#include <net/inet_timewait_sock.h>
#include <net/tcp_states.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);
	__u64 seq_nr =  ntohs(dh->dccph_seq);

	if (dh->dccph_x != 0)
		seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
	else
		seq_nr += (u32)dh->dccph_seq2 << 16;

	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);
	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
}

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
#define DCCPF_INITIAL_ACK_RATIO			2
#define DCCPF_INITIAL_CCID			2
#define DCCPF_INITIAL_SEND_ACK_VECTOR		1
/* 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_minisock - Minimal DCCP connection representation
  *
  * Will be used to pass the state from dccp_request_sock to dccp_sock.
  *
  * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
  * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
  * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
  * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
  */
struct dccp_minisock {
	__u64			dccpms_sequence_window;
	__u8			dccpms_rx_ccid;
	__u8			dccpms_tx_ccid;
	__u8			dccpms_send_ack_vector;
	__u8			dccpms_send_ndp_count;
	__u8			dccpms_ack_ratio;
	struct list_head	dccpms_pending;
	struct list_head	dccpms_conf;
};

struct dccp_opt_conf {
	__u8			*dccpoc_val;
	__u8			dccpoc_len;
};

struct dccp_opt_pend {
	struct list_head	dccpop_node;
	__u8			dccpop_type;
	__u8			dccpop_feat;
	__u8		        *dccpop_val;
	__u8			dccpop_len;
	int			dccpop_conf;
	struct dccp_opt_conf    *dccpop_sc;
};

extern void __dccp_minisock_init(struct dccp_minisock *dmsk);
extern void dccp_minisock_init(struct dccp_minisock *dmsk);

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;
	__be32			 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;
	__be32	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 __be32 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_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;
	__be32				dccps_service;
	struct dccp_service_list	*dccps_service_list;
	struct timeval			dccps_timestamp_time;
	__u32				dccps_timestamp_echo;
	__u32				dccps_packet_size;
	__u16				dccps_l_ack_ratio;
	__u16				dccps_r_ack_ratio;
	unsigned long			dccps_ndp_count;
	__u32				dccps_mss_cache;
	struct dccp_minisock		dccps_minisock;
	struct dccp_ackvec		*dccps_hc_rx_ackvec;
	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 struct dccp_minisock *dccp_msk(const struct sock *sk)
{
	return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
}

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 */
Commit	Line	Data
	1	#ifndef _LINUX_DCCP_H
	2	#define _LINUX_DCCP_H
	3
	4	#include <linux/types.h>
	5	#include <asm/byteorder.h>
	6
	7	/**
	8	* struct dccp_hdr - generic part of DCCP packet header
	9	*
	10	* @dccph_sport - Relevant port on the endpoint that sent this packet
	11	* @dccph_dport - Relevant port on the other endpoint
	12	* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
	13	* @dccph_ccval - Used by the HC-Sender CCID
	14	* @dccph_cscov - Parts of the packet that are covered by the Checksum field
	15	* @dccph_checksum - Internet checksum, depends on dccph_cscov
	16	* @dccph_x - 0 = 24 bit sequence number, 1 = 48
	17	* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
	18	* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
	19	*/
	20	struct dccp_hdr {
	21	__be16 dccph_sport,
	22	dccph_dport;
	23	__u8 dccph_doff;
	24	#if defined(__LITTLE_ENDIAN_BITFIELD)
	25	__u8 dccph_cscov:4,
	26	dccph_ccval:4;
	27	#elif defined(__BIG_ENDIAN_BITFIELD)
	28	__u8 dccph_ccval:4,
	29	dccph_cscov:4;
	30	#else
	31	#error "Adjust your <asm/byteorder.h> defines"
	32	#endif
	33	__u16 dccph_checksum;
	34	#if defined(__LITTLE_ENDIAN_BITFIELD)
	35	__u8 dccph_x:1,
	36	dccph_type:4,
	37	dccph_reserved:3;
	38	#elif defined(__BIG_ENDIAN_BITFIELD)
	39	__u8 dccph_reserved:3,
	40	dccph_type:4,
	41	dccph_x:1;
	42	#else
	43	#error "Adjust your <asm/byteorder.h> defines"
	44	#endif
	45	__u8 dccph_seq2;
	46	__be16 dccph_seq;
	47	};
	48
	49	/**
	50	* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
	51	*
	52	* @dccph_seq_low - low 24 bits of a 48 bit seq packet
	53	*/
	54	struct dccp_hdr_ext {
	55	__be32 dccph_seq_low;
	56	};
	57
	58	/**
	59	* struct dccp_hdr_request - Conection initiation request header
	60	*
	61	* @dccph_req_service - Service to which the client app wants to connect
	62	* @dccph_req_options - list of options (must be a multiple of 32 bits
	63	*/
	64	struct dccp_hdr_request {
	65	__be32 dccph_req_service;
	66	};
	67	/**
	68	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	69	*
	70	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	71	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	72	*/
	73	struct dccp_hdr_ack_bits {
	74	__be16 dccph_reserved1;
	75	__be16 dccph_ack_nr_high;
	76	__be32 dccph_ack_nr_low;
	77	};
	78	/**
	79	* struct dccp_hdr_response - Conection initiation response header
	80	*
	81	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	82	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	83	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
	84	* @dccph_resp_options - list of options (must be a multiple of 32 bits
	85	*/
	86	struct dccp_hdr_response {
	87	struct dccp_hdr_ack_bits dccph_resp_ack;
	88	__be32 dccph_resp_service;
	89	};
	90
	91	/**
	92	* struct dccp_hdr_reset - Unconditionally shut down a connection
	93	*
	94	* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
	95	* @dccph_reset_options - list of options (must be a multiple of 32 bits
	96	*/
	97	struct dccp_hdr_reset {
	98	struct dccp_hdr_ack_bits dccph_reset_ack;
	99	__u8 dccph_reset_code,
	100	dccph_reset_data[3];
	101	};
	102
	103	enum dccp_pkt_type {
	104	DCCP_PKT_REQUEST = 0,
	105	DCCP_PKT_RESPONSE,
	106	DCCP_PKT_DATA,
	107	DCCP_PKT_ACK,
	108	DCCP_PKT_DATAACK,
	109	DCCP_PKT_CLOSEREQ,
	110	DCCP_PKT_CLOSE,
	111	DCCP_PKT_RESET,
	112	DCCP_PKT_SYNC,
	113	DCCP_PKT_SYNCACK,
	114	DCCP_PKT_INVALID,
	115	};
	116
	117	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
	118
	119	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	120	{
	121	if (type == DCCP_PKT_DATA)
	122	return 0;
	123	if (type == DCCP_PKT_DATAACK \|\|
	124	type == DCCP_PKT_ACK \|\|
	125	type == DCCP_PKT_SYNC \|\|
	126	type == DCCP_PKT_SYNCACK \|\|
	127	type == DCCP_PKT_CLOSE \|\|
	128	type == DCCP_PKT_CLOSEREQ)
	129	return sizeof(struct dccp_hdr_ack_bits);
	130	if (type == DCCP_PKT_REQUEST)
	131	return sizeof(struct dccp_hdr_request);
	132	if (type == DCCP_PKT_RESPONSE)
	133	return sizeof(struct dccp_hdr_response);
	134	return sizeof(struct dccp_hdr_reset);
	135	}
	136	enum dccp_reset_codes {
	137	DCCP_RESET_CODE_UNSPECIFIED = 0,
	138	DCCP_RESET_CODE_CLOSED,
	139	DCCP_RESET_CODE_ABORTED,
	140	DCCP_RESET_CODE_NO_CONNECTION,
	141	DCCP_RESET_CODE_PACKET_ERROR,
	142	DCCP_RESET_CODE_OPTION_ERROR,
	143	DCCP_RESET_CODE_MANDATORY_ERROR,
	144	DCCP_RESET_CODE_CONNECTION_REFUSED,
	145	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	146	DCCP_RESET_CODE_TOO_BUSY,
	147	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	148	DCCP_RESET_CODE_AGGRESSION_PENALTY,
	149	};
	150
	151	/* DCCP options */
	152	enum {
	153	DCCPO_PADDING = 0,
	154	DCCPO_MANDATORY = 1,
	155	DCCPO_MIN_RESERVED = 3,
	156	DCCPO_MAX_RESERVED = 31,
	157	DCCPO_CHANGE_L = 32,
	158	DCCPO_CONFIRM_L = 33,
	159	DCCPO_CHANGE_R = 34,
	160	DCCPO_CONFIRM_R = 35,
	161	DCCPO_NDP_COUNT = 37,
	162	DCCPO_ACK_VECTOR_0 = 38,
	163	DCCPO_ACK_VECTOR_1 = 39,
	164	DCCPO_TIMESTAMP = 41,
	165	DCCPO_TIMESTAMP_ECHO = 42,
	166	DCCPO_ELAPSED_TIME = 43,
	167	DCCPO_MAX = 45,
	168	DCCPO_MIN_CCID_SPECIFIC = 128,
	169	DCCPO_MAX_CCID_SPECIFIC = 255,
	170	};
	171
	172	/* DCCP features */
	173	enum {
	174	DCCPF_RESERVED = 0,
	175	DCCPF_CCID = 1,
	176	DCCPF_SEQUENCE_WINDOW = 3,
	177	DCCPF_ACK_RATIO = 5,
	178	DCCPF_SEND_ACK_VECTOR = 6,
	179	DCCPF_SEND_NDP_COUNT = 7,
	180	/* 10-127 reserved */
	181	DCCPF_MIN_CCID_SPECIFIC = 128,
	182	DCCPF_MAX_CCID_SPECIFIC = 255,
	183	};
	184
	185	/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
	186	struct dccp_so_feat {
	187	__u8 dccpsf_feat;
	188	__u8 *dccpsf_val;
	189	__u8 dccpsf_len;
	190	};
	191
	192	/* DCCP socket options */
	193	#define DCCP_SOCKOPT_PACKET_SIZE 1
	194	#define DCCP_SOCKOPT_SERVICE 2
	195	#define DCCP_SOCKOPT_CHANGE_L 3
	196	#define DCCP_SOCKOPT_CHANGE_R 4
	197	#define DCCP_SOCKOPT_CCID_RX_INFO 128
	198	#define DCCP_SOCKOPT_CCID_TX_INFO 192
	199
	200	#define DCCP_SERVICE_LIST_MAX_LEN 32
	201
	202	#ifdef __KERNEL__
	203
	204	#include <linux/in.h>
	205	#include <linux/list.h>
	206	#include <linux/uio.h>
	207	#include <linux/workqueue.h>
	208
	209	#include <net/inet_connection_sock.h>
	210	#include <net/inet_sock.h>
	211	#include <net/inet_timewait_sock.h>
	212	#include <net/tcp_states.h>
	213
	214	enum dccp_state {
	215	DCCP_OPEN = TCP_ESTABLISHED,
	216	DCCP_REQUESTING = TCP_SYN_SENT,
	217	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	218	This mapping is horrible, but TCP has
	219	no matching state for DCCP_PARTOPEN,
	220	as TCP_SYN_RECV is already used by
	221	DCCP_RESPOND, why don't stop using TCP
	222	mapping of states? OK, now we don't use
	223	sk_stream_sendmsg anymore, so doesn't
	224	seem to exist any reason for us to
	225	do the TCP mapping here */
	226	DCCP_LISTEN = TCP_LISTEN,
	227	DCCP_RESPOND = TCP_SYN_RECV,
	228	DCCP_CLOSING = TCP_CLOSING,
	229	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	230	DCCP_CLOSED = TCP_CLOSE,
	231	DCCP_MAX_STATES = TCP_MAX_STATES,
	232	};
	233
	234	#define DCCP_STATE_MASK 0xf
	235	#define DCCP_ACTION_FIN (1<<7)
	236
	237	enum {
	238	DCCPF_OPEN = TCPF_ESTABLISHED,
	239	DCCPF_REQUESTING = TCPF_SYN_SENT,
	240	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	241	DCCPF_LISTEN = TCPF_LISTEN,
	242	DCCPF_RESPOND = TCPF_SYN_RECV,
	243	DCCPF_CLOSING = TCPF_CLOSING,
	244	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	245	DCCPF_CLOSED = TCPF_CLOSE,
	246	};
	247
	248	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	249	{
	250	return (struct dccp_hdr *)skb->h.raw;
	251	}
	252
	253	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
	254	{
	255	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
	256	}
	257
	258	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	259	{
	260	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	261	}
	262
	263	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	264	{
	265	const struct dccp_hdr *dh = dccp_hdr(skb);
	266	return __dccp_basic_hdr_len(dh);
	267	}
	268
	269	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	270	{
	271	const struct dccp_hdr *dh = dccp_hdr(skb);
	272	__u64 seq_nr = ntohs(dh->dccph_seq);
	273
	274	if (dh->dccph_x != 0)
	275	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
	276	else
	277	seq_nr += (u32)dh->dccph_seq2 << 16;
	278
	279	return seq_nr;
	280	}
	281
	282	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	283	{
	284	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
	285	}
	286
	287	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	288	{
	289	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
	290	}
	291
	292	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	293	{
	294	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	295	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
	296	}
	297
	298	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	299	{
	300	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
	301	}
	302
	303	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	304	{
	305	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
	306	}
	307
	308	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	309	{
	310	return __dccp_basic_hdr_len(dh) +
	311	dccp_packet_hdr_len(dh->dccph_type);
	312	}
	313
	314	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
	315	{
	316	return __dccp_hdr_len(dccp_hdr(skb));
	317	}
	318
	319
	320	/* initial values for each feature */
	321	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
	322	#define DCCPF_INITIAL_ACK_RATIO 2
	323	#define DCCPF_INITIAL_CCID 2
	324	#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
	325	/* FIXME: for now we're default to 1 but it should really be 0 */
	326	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	327
	328	#define DCCP_NDP_LIMIT 0xFFFFFF
	329
	330	/**
	331	* struct dccp_minisock - Minimal DCCP connection representation
	332	*
	333	* Will be used to pass the state from dccp_request_sock to dccp_sock.
	334	*
	335	* @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
	336	* @dccpms_ccid - Congestion Control Id (CCID) (section 10)
	337	* @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
	338	* @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
	339	*/
	340	struct dccp_minisock {
	341	__u64 dccpms_sequence_window;
	342	__u8 dccpms_rx_ccid;
	343	__u8 dccpms_tx_ccid;
	344	__u8 dccpms_send_ack_vector;
	345	__u8 dccpms_send_ndp_count;
	346	__u8 dccpms_ack_ratio;
	347	struct list_head dccpms_pending;
	348	struct list_head dccpms_conf;
	349	};
	350
	351	struct dccp_opt_conf {
	352	__u8 *dccpoc_val;
	353	__u8 dccpoc_len;
	354	};
	355
	356	struct dccp_opt_pend {
	357	struct list_head dccpop_node;
	358	__u8 dccpop_type;
	359	__u8 dccpop_feat;
	360	__u8 *dccpop_val;
	361	__u8 dccpop_len;
	362	int dccpop_conf;
	363	struct dccp_opt_conf *dccpop_sc;
	364	};
	365
	366	extern void __dccp_minisock_init(struct dccp_minisock *dmsk);
	367	extern void dccp_minisock_init(struct dccp_minisock *dmsk);
	368
	369	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	370
	371	struct dccp_request_sock {
	372	struct inet_request_sock dreq_inet_rsk;
	373	__u64 dreq_iss;
	374	__u64 dreq_isr;
	375	__be32 dreq_service;
	376	};
	377
	378	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	379	{
	380	return (struct dccp_request_sock *)req;
	381	}
	382
	383	extern struct inet_timewait_death_row dccp_death_row;
	384
	385	struct dccp_options_received {
	386	u32 dccpor_ndp; /* only 24 bits */
	387	u32 dccpor_timestamp;
	388	u32 dccpor_timestamp_echo;
	389	u32 dccpor_elapsed_time;
	390	};
	391
	392	struct ccid;
	393
	394	enum dccp_role {
	395	DCCP_ROLE_UNDEFINED,
	396	DCCP_ROLE_LISTEN,
	397	DCCP_ROLE_CLIENT,
	398	DCCP_ROLE_SERVER,
	399	};
	400
	401	struct dccp_service_list {
	402	__u32 dccpsl_nr;
	403	__be32 dccpsl_list[0];
	404	};
	405
	406	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
	407
	408	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
	409	const __be32 service)
	410	{
	411	if (likely(sl != NULL)) {
	412	u32 i = sl->dccpsl_nr;
	413	while (i--)
	414	if (sl->dccpsl_list[i] == service)
	415	return 1;
	416	}
	417	return 0;
	418	}
	419
	420	struct dccp_ackvec;
	421
	422	/**
	423	* struct dccp_sock - DCCP socket state
	424	*
	425	* @dccps_swl - sequence number window low
	426	* @dccps_swh - sequence number window high
	427	* @dccps_awl - acknowledgement number window low
	428	* @dccps_awh - acknowledgement number window high
	429	* @dccps_iss - initial sequence number sent
	430	* @dccps_isr - initial sequence number received
	431	* @dccps_osr - first OPEN sequence number received
	432	* @dccps_gss - greatest sequence number sent
	433	* @dccps_gsr - greatest valid sequence number received
	434	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
	435	* @dccps_timestamp_time - time of latest TIMESTAMP option
	436	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
	437	* @dccps_packet_size - Set thru setsockopt
	438	* @dccps_role - Role of this sock, one of %dccp_role
	439	* @dccps_ndp_count - number of Non Data Packets since last data packet
	440	* @dccps_hc_rx_ackvec - rx half connection ack vector
	441	*/
	442	struct dccp_sock {
	443	/* inet_connection_sock has to be the first member of dccp_sock */
	444	struct inet_connection_sock dccps_inet_connection;
	445	__u64 dccps_swl;
	446	__u64 dccps_swh;
	447	__u64 dccps_awl;
	448	__u64 dccps_awh;
	449	__u64 dccps_iss;
	450	__u64 dccps_isr;
	451	__u64 dccps_osr;
	452	__u64 dccps_gss;
	453	__u64 dccps_gsr;
	454	__u64 dccps_gar;
	455	__be32 dccps_service;
	456	struct dccp_service_list *dccps_service_list;
	457	struct timeval dccps_timestamp_time;
	458	__u32 dccps_timestamp_echo;
	459	__u32 dccps_packet_size;
	460	__u16 dccps_l_ack_ratio;
	461	__u16 dccps_r_ack_ratio;
	462	unsigned long dccps_ndp_count;
	463	__u32 dccps_mss_cache;
	464	struct dccp_minisock dccps_minisock;
	465	struct dccp_ackvec *dccps_hc_rx_ackvec;
	466	struct ccid *dccps_hc_rx_ccid;
	467	struct ccid *dccps_hc_tx_ccid;
	468	struct dccp_options_received dccps_options_received;
	469	struct timeval dccps_epoch;
	470	enum dccp_role dccps_role:2;
	471	__u8 dccps_hc_rx_insert_options:1;
	472	__u8 dccps_hc_tx_insert_options:1;
	473	};
	474
	475	static inline struct dccp_sock dccp_sk(const struct sock sk)
	476	{
	477	return (struct dccp_sock *)sk;
	478	}
	479
	480	static inline struct dccp_minisock dccp_msk(const struct sock sk)
	481	{
	482	return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
	483	}
	484
	485	static inline int dccp_service_not_initialized(const struct sock *sk)
	486	{
	487	return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
	488	}
	489
	490	static inline const char dccp_role(const struct sock sk)
	491	{
	492	switch (dccp_sk(sk)->dccps_role) {
	493	case DCCP_ROLE_UNDEFINED: return "undefined";
	494	case DCCP_ROLE_LISTEN: return "listen";
	495	case DCCP_ROLE_SERVER: return "server";
	496	case DCCP_ROLE_CLIENT: return "client";
	497	}
	498	return NULL;
	499	}
	500
	501	#endif /* __KERNEL__ */
	502
	503	#endif /* _LINUX_DCCP_H */