[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
	__sum16	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 CCIDS */
enum {
	DCCPC_CCID2 = 2,
	DCCPC_CCID3 = 3,
};

/* DCCP features (RFC 4340 section 6.4) */
enum {
	DCCPF_RESERVED = 0,
	DCCPF_CCID = 1,
	DCCPF_SHORT_SEQNOS = 2,		/* XXX: not yet implemented */
	DCCPF_SEQUENCE_WINDOW = 3,
	DCCPF_ECN_INCAPABLE = 4,	/* XXX: not yet implemented */
	DCCPF_ACK_RATIO = 5,
	DCCPF_SEND_ACK_VECTOR = 6,
	DCCPF_SEND_NDP_COUNT = 7,
	DCCPF_MIN_CSUM_COVER = 8,
	DCCPF_DATA_CHECKSUM = 9,	/* XXX: not yet implemented */
	/* 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 __user *dccpsf_val;
	__u8 dccpsf_len;
};

/* DCCP socket options */
#define DCCP_SOCKOPT_PACKET_SIZE	1 /* XXX deprecated, without effect */
#define DCCP_SOCKOPT_SERVICE		2
#define DCCP_SOCKOPT_CHANGE_L		3
#define DCCP_SOCKOPT_CHANGE_R		4
#define DCCP_SOCKOPT_SEND_CSCOV		10
#define DCCP_SOCKOPT_RECV_CSCOV		11
#define DCCP_SOCKOPT_CCID_RX_INFO	128
#define DCCP_SOCKOPT_CCID_TX_INFO	192

/* maximum number of services provided on the same listening port */
#define DCCP_SERVICE_LIST_MAX_LEN      32

#ifdef __KERNEL__

#include <linux/in.h>
#include <linux/ktime.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_transport_header(skb);
}

static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
{
	skb_push(skb, headlen);
	skb_reset_transport_header(skb);
	return memset(skb_transport_header(skb), 0, headlen);
}

static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
{
	return (struct dccp_hdr_ext *)(skb_transport_header(skb) +
				       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_transport_header(skb) +
					   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_transport_header(skb) +
					    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_transport_header(skb) +
					    dccp_basic_hdr_len(skb));
}

static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
{
	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
					 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			DCCPC_CCID2
#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)
  * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
  * @dccpms_pending - List of features being negotiated
  * @dccpms_conf -
  */
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)
#define DCCP_SERVICE_CODE_IS_ABSENT		0

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_service - first (passive sock) or unique (active sock) service code
 * @dccps_service_list - second .. last service code on passive socket
 * @dccps_timestamp_time - time of latest TIMESTAMP option
 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
 * @dccps_l_ack_ratio - feature-local Ack Ratio
 * @dccps_r_ack_ratio - feature-remote Ack Ratio
 * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
 * @dccps_ndp_count - number of Non Data Packets since last data packet
 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
 * @dccps_minisock - associated minisock (accessed via dccp_msk)
 * @dccps_hc_rx_ackvec - rx half connection ack vector
 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
 * @dccps_options_received - parsed set of retrieved options
 * @dccps_role - role of this sock, one of %dccp_role
 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
 * @dccps_hc_tx_insert_options - sender wants to add options when sending
 * @dccps_xmit_timer - timer for when CCID is not ready to send
 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
 */
struct dccp_sock {
	/* inet_connection_sock has to be the first member of dccp_sock */
	struct inet_connection_sock	dccps_inet_connection;
#define dccps_syn_rtt			dccps_inet_connection.icsk_ack.lrcvtime
	__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;
	ktime_t				dccps_timestamp_time;
	__u32				dccps_timestamp_echo;
	__u16				dccps_l_ack_ratio;
	__u16				dccps_r_ack_ratio;
	__u16				dccps_pcslen;
	__u16				dccps_pcrlen;
	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;
	enum dccp_role			dccps_role:2;
	__u8				dccps_hc_rx_insert_options:1;
	__u8				dccps_hc_tx_insert_options:1;
	struct timer_list		dccps_xmit_timer;
};

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 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
7c657876 ACM	1	#ifndef _LINUX_DCCP_H
	2	#define _LINUX_DCCP_H
	3
7c657876	4	#include <linux/types.h>
5a47a470	5	#include <asm/byteorder.h>
7c657876	6
7c657876 ACM	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 {
60fe62e7	21	__be16 dccph_sport,
7c657876 ACM	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
9981a0e3	33	__sum16 dccph_checksum;
7c657876	34	#if defined(__LITTLE_ENDIAN_BITFIELD)
60fe62e7	35	__u8 dccph_x:1,
7c657876	36	dccph_type:4,
60fe62e7	37	dccph_reserved:3;
7c657876	38	#elif defined(__BIG_ENDIAN_BITFIELD)
60fe62e7	39	__u8 dccph_reserved:3,
7c657876	40	dccph_type:4,
60fe62e7	41	dccph_x:1;
7c657876 ACM	42	#else
	43	#error "Adjust your <asm/byteorder.h> defines"
	44	#endif
60fe62e7 AB	45	__u8 dccph_seq2;
60fe62e7 AB	46	__be16 dccph_seq;
7c657876 ACM	47	};
7c657876 ACM	48
7c657876 ACM	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 {
60fe62e7	55	__be32 dccph_seq_low;
7c657876 ACM	56	};
7c657876 ACM	57
7c657876 ACM	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 {
60fe62e7	65	__be32 dccph_req_service;
7c657876	66	};
7c657876 ACM	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 {
60fe62e7 AB	74	__be16 dccph_reserved1;
	75	__be16 dccph_ack_nr_high;
	76	__be32 dccph_ack_nr_low;
7c657876	77	};
7c657876 ACM	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;
60fe62e7	88	__be32 dccph_resp_service;
7c657876 ACM	89	};
7c657876 ACM	90
7c657876 ACM	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
7c657876 ACM	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	}
7c657876 ACM	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,
afe00251 AB	157	DCCPO_CHANGE_L = 32,
	158	DCCPO_CONFIRM_L = 33,
	159	DCCPO_CHANGE_R = 34,
	160	DCCPO_CONFIRM_R = 35,
7c657876 ACM	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
b83eff64 IM	172	/* DCCP CCIDS */
	173	enum {
	174	DCCPC_CCID2 = 2,
	175	DCCPC_CCID3 = 3,
	176	};
	177
c02fdc0e	178	/* DCCP features (RFC 4340 section 6.4) */
8109b02b ACM	179	enum {
	180	DCCPF_RESERVED = 0,
	181	DCCPF_CCID = 1,
c02fdc0e	182	DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
8109b02b	183	DCCPF_SEQUENCE_WINDOW = 3,
c02fdc0e	184	DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
8109b02b ACM	185	DCCPF_ACK_RATIO = 5,
	186	DCCPF_SEND_ACK_VECTOR = 6,
	187	DCCPF_SEND_NDP_COUNT = 7,
6f4e5fff	188	DCCPF_MIN_CSUM_COVER = 8,
c02fdc0e	189	DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
8109b02b ACM	190	/* 10-127 reserved */
	191	DCCPF_MIN_CCID_SPECIFIC = 128,
	192	DCCPF_MAX_CCID_SPECIFIC = 255,
7c657876 ACM	193	};
7c657876 ACM	194
afe00251 AB	195	/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
	196	struct dccp_so_feat {
	197	__u8 dccpsf_feat;
1acc04cd	198	__u8 __user *dccpsf_val;
afe00251 AB	199	__u8 dccpsf_len;
	200	};
	201
a84ffe43	202	/* DCCP socket options */
5aed3243	203	#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
67e6b629	204	#define DCCP_SOCKOPT_SERVICE 2
afe00251 AB	205	#define DCCP_SOCKOPT_CHANGE_L 3
afe00251 AB	206	#define DCCP_SOCKOPT_CHANGE_R 4
6f4e5fff GR	207	#define DCCP_SOCKOPT_SEND_CSCOV 10
6f4e5fff GR	208	#define DCCP_SOCKOPT_RECV_CSCOV 11
88f964db ACM	209	#define DCCP_SOCKOPT_CCID_RX_INFO 128
88f964db ACM	210	#define DCCP_SOCKOPT_CCID_TX_INFO 192
67e6b629	211
09dbc389	212	/* maximum number of services provided on the same listening port */
67e6b629	213	#define DCCP_SERVICE_LIST_MAX_LEN 32
a84ffe43	214
5a47a470 HW	215	#ifdef __KERNEL__
	216
	217	#include <linux/in.h>
19ac2146	218	#include <linux/ktime.h>
5a47a470 HW	219	#include <linux/list.h>
	220	#include <linux/uio.h>
	221	#include <linux/workqueue.h>
	222
	223	#include <net/inet_connection_sock.h>
14c85021	224	#include <net/inet_sock.h>
64cf1e5d	225	#include <net/inet_timewait_sock.h>
5a47a470	226	#include <net/tcp_states.h>
5a47a470 HW	227
	228	enum dccp_state {
	229	DCCP_OPEN = TCP_ESTABLISHED,
	230	DCCP_REQUESTING = TCP_SYN_SENT,
	231	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	232	This mapping is horrible, but TCP has
	233	no matching state for DCCP_PARTOPEN,
	234	as TCP_SYN_RECV is already used by
	235	DCCP_RESPOND, why don't stop using TCP
	236	mapping of states? OK, now we don't use
	237	sk_stream_sendmsg anymore, so doesn't
	238	seem to exist any reason for us to
	239	do the TCP mapping here */
	240	DCCP_LISTEN = TCP_LISTEN,
	241	DCCP_RESPOND = TCP_SYN_RECV,
	242	DCCP_CLOSING = TCP_CLOSING,
	243	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	244	DCCP_CLOSED = TCP_CLOSE,
	245	DCCP_MAX_STATES = TCP_MAX_STATES,
	246	};
	247
	248	#define DCCP_STATE_MASK 0xf
	249	#define DCCP_ACTION_FIN (1<<7)
	250
	251	enum {
	252	DCCPF_OPEN = TCPF_ESTABLISHED,
	253	DCCPF_REQUESTING = TCPF_SYN_SENT,
	254	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	255	DCCPF_LISTEN = TCPF_LISTEN,
	256	DCCPF_RESPOND = TCPF_SYN_RECV,
	257	DCCPF_CLOSING = TCPF_CLOSING,
	258	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	259	DCCPF_CLOSED = TCPF_CLOSE,
	260	};
	261
	262	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	263	{
9c70220b	264	return (struct dccp_hdr *)skb_transport_header(skb);
5a47a470 HW	265	}
5a47a470 HW	266
9b42078e GR	267	static inline struct dccp_hdr dccp_zeroed_hdr(struct sk_buff skb, int headlen)
9b42078e GR	268	{
badff6d0 ACM	269	skb_push(skb, headlen);
badff6d0 ACM	270	skb_reset_transport_header(skb);
9c70220b	271	return memset(skb_transport_header(skb), 0, headlen);
9b42078e GR	272	}
9b42078e GR	273
5a47a470 HW	274	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
5a47a470 HW	275	{
9c70220b ACM	276	return (struct dccp_hdr_ext *)(skb_transport_header(skb) +
9c70220b ACM	277	sizeof(struct dccp_hdr));
5a47a470 HW	278	}
5a47a470 HW	279
1d3de414 HW	280	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	281	{
	282	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	283	}
	284
5a47a470 HW	285	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	286	{
	287	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	288	return __dccp_basic_hdr_len(dh);
5a47a470 HW	289	}
	290
	291	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	292	{
	293	const struct dccp_hdr *dh = dccp_hdr(skb);
60fe62e7	294	__u64 seq_nr = ntohs(dh->dccph_seq);
5a47a470 HW	295
	296	if (dh->dccph_x != 0)
	297	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
60fe62e7 AB	298	else
60fe62e7 AB	299	seq_nr += (u32)dh->dccph_seq2 << 16;
5a47a470 HW	300
	301	return seq_nr;
	302	}
	303
	304	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	305	{
9c70220b ACM	306	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
9c70220b ACM	307	dccp_basic_hdr_len(skb));
5a47a470 HW	308	}
	309
	310	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	311	{
9c70220b ACM	312	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
9c70220b ACM	313	dccp_basic_hdr_len(skb));
5a47a470 HW	314	}
	315
	316	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	317	{
	318	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
60fe62e7	319	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
5a47a470 HW	320	}
	321
	322	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	323	{
9c70220b ACM	324	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
9c70220b ACM	325	dccp_basic_hdr_len(skb));
5a47a470 HW	326	}
	327
	328	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	329	{
9c70220b ACM	330	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
9c70220b ACM	331	dccp_basic_hdr_len(skb));
5a47a470 HW	332	}
5a47a470 HW	333
1d3de414 HW	334	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	335	{
	336	return __dccp_basic_hdr_len(dh) +
	337	dccp_packet_hdr_len(dh->dccph_type);
	338	}
	339
5a47a470 HW	340	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	341	{
1d3de414	342	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	343	}
	344
	345
7c657876 ACM	346	/* initial values for each feature */
7c657876 ACM	347	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
afe00251	348	#define DCCPF_INITIAL_ACK_RATIO 2
b83eff64	349	#define DCCPF_INITIAL_CCID DCCPC_CCID2
2a91aa39	350	#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
7c657876 ACM	351	/* FIXME: for now we're default to 1 but it should really be 0 */
	352	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	353
	354	#define DCCP_NDP_LIMIT 0xFFFFFF
	355
	356	/**
a4bf3902 ACM	357	* struct dccp_minisock - Minimal DCCP connection representation
	358	*
	359	* Will be used to pass the state from dccp_request_sock to dccp_sock.
	360	*
	361	* @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
	362	* @dccpms_ccid - Congestion Control Id (CCID) (section 10)
	363	* @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
	364	* @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
09dbc389 GR	365	* @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
	366	* @dccpms_pending - List of features being negotiated
	367	* @dccpms_conf -
7c657876	368	*/
a4bf3902 ACM	369	struct dccp_minisock {
	370	__u64 dccpms_sequence_window;
	371	__u8 dccpms_rx_ccid;
	372	__u8 dccpms_tx_ccid;
	373	__u8 dccpms_send_ack_vector;
	374	__u8 dccpms_send_ndp_count;
	375	__u8 dccpms_ack_ratio;
	376	struct list_head dccpms_pending;
	377	struct list_head dccpms_conf;
afe00251 AB	378	};
	379
	380	struct dccp_opt_conf {
	381	__u8 *dccpoc_val;
	382	__u8 dccpoc_len;
	383	};
	384
	385	struct dccp_opt_pend {
	386	struct list_head dccpop_node;
	387	__u8 dccpop_type;
	388	__u8 dccpop_feat;
	389	__u8 *dccpop_val;
	390	__u8 dccpop_len;
	391	int dccpop_conf;
	392	struct dccp_opt_conf *dccpop_sc;
7c657876 ACM	393	};
7c657876 ACM	394
a4bf3902 ACM	395	extern void __dccp_minisock_init(struct dccp_minisock *dmsk);
	396	extern void dccp_minisock_init(struct dccp_minisock *dmsk);
	397
7c657876 ACM	398	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	399
	400	struct dccp_request_sock {
	401	struct inet_request_sock dreq_inet_rsk;
	402	__u64 dreq_iss;
	403	__u64 dreq_isr;
60fe62e7	404	__be32 dreq_service;
7c657876 ACM	405	};
	406
	407	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	408	{
	409	return (struct dccp_request_sock *)req;
	410	}
	411
64cf1e5d ACM	412	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	413
7c657876	414	struct dccp_options_received {
ae31c339	415	u32 dccpor_ndp; /* only 24 bits */
7c657876 ACM	416	u32 dccpor_timestamp;
	417	u32 dccpor_timestamp_echo;
	418	u32 dccpor_elapsed_time;
	419	};
	420
	421	struct ccid;
	422
	423	enum dccp_role {
	424	DCCP_ROLE_UNDEFINED,
	425	DCCP_ROLE_LISTEN,
	426	DCCP_ROLE_CLIENT,
	427	DCCP_ROLE_SERVER,
	428	};
	429
67e6b629 ACM	430	struct dccp_service_list {
67e6b629 ACM	431	__u32 dccpsl_nr;
60fe62e7	432	__be32 dccpsl_list[0];
67e6b629 ACM	433	};
	434
	435	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
8109b02b	436	#define DCCP_SERVICE_CODE_IS_ABSENT 0
67e6b629 ACM	437
67e6b629 ACM	438	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
60fe62e7	439	const __be32 service)
67e6b629 ACM	440	{
	441	if (likely(sl != NULL)) {
	442	u32 i = sl->dccpsl_nr;
	443	while (i--)
	444	if (sl->dccpsl_list[i] == service)
8109b02b	445	return 1;
67e6b629 ACM	446	}
	447	return 0;
	448	}
	449
ae31c339 ACM	450	struct dccp_ackvec;
ae31c339 ACM	451
7c657876 ACM	452	/**
	453	* struct dccp_sock - DCCP socket state
	454	*
	455	* @dccps_swl - sequence number window low
	456	* @dccps_swh - sequence number window high
	457	* @dccps_awl - acknowledgement number window low
	458	* @dccps_awh - acknowledgement number window high
	459	* @dccps_iss - initial sequence number sent
	460	* @dccps_isr - initial sequence number received
	461	* @dccps_osr - first OPEN sequence number received
	462	* @dccps_gss - greatest sequence number sent
	463	* @dccps_gsr - greatest valid sequence number received
	464	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
09dbc389 GR	465	* @dccps_service - first (passive sock) or unique (active sock) service code
09dbc389 GR	466	* @dccps_service_list - second .. last service code on passive socket
7c657876 ACM	467	* @dccps_timestamp_time - time of latest TIMESTAMP option
7c657876 ACM	468	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
91d73c15 GR	469	* @dccps_l_ack_ratio - feature-local Ack Ratio
91d73c15 GR	470	* @dccps_r_ack_ratio - feature-remote Ack Ratio
6f4e5fff GR	471	* @dccps_pcslen - sender partial checksum coverage (via sockopt)
6f4e5fff GR	472	* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
7c657876	473	* @dccps_ndp_count - number of Non Data Packets since last data packet
91d73c15 GR	474	* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
91d73c15 GR	475	* @dccps_minisock - associated minisock (accessed via dccp_msk)
ae31c339	476	* @dccps_hc_rx_ackvec - rx half connection ack vector
91d73c15 GR	477	* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
	478	* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
	479	* @dccps_options_received - parsed set of retrieved options
	480	* @dccps_role - role of this sock, one of %dccp_role
	481	* @dccps_hc_rx_insert_options - receiver wants to add options when acking
	482	* @dccps_hc_tx_insert_options - sender wants to add options when sending
97e5848d	483	* @dccps_xmit_timer - timer for when CCID is not ready to send
89560b53	484	* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
7c657876 ACM	485	*/
	486	struct dccp_sock {
	487	/* inet_connection_sock has to be the first member of dccp_sock */
	488	struct inet_connection_sock dccps_inet_connection;
89560b53	489	#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
7c657876 ACM	490	__u64 dccps_swl;
	491	__u64 dccps_swh;
	492	__u64 dccps_awl;
	493	__u64 dccps_awh;
	494	__u64 dccps_iss;
	495	__u64 dccps_isr;
	496	__u64 dccps_osr;
	497	__u64 dccps_gss;
	498	__u64 dccps_gsr;
	499	__u64 dccps_gar;
60fe62e7	500	__be32 dccps_service;
67e6b629	501	struct dccp_service_list *dccps_service_list;
19ac2146	502	ktime_t dccps_timestamp_time;
7c657876	503	__u32 dccps_timestamp_echo;
2a91aa39 AB	504	__u16 dccps_l_ack_ratio;
2a91aa39 AB	505	__u16 dccps_r_ack_ratio;
6f4e5fff GR	506	__u16 dccps_pcslen;
6f4e5fff GR	507	__u16 dccps_pcrlen;
7c657876	508	unsigned long dccps_ndp_count;
7c657876	509	__u32 dccps_mss_cache;
a4bf3902	510	struct dccp_minisock dccps_minisock;
ae31c339	511	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	512	struct ccid *dccps_hc_rx_ccid;
	513	struct ccid *dccps_hc_tx_ccid;
	514	struct dccp_options_received dccps_options_received;
	515	enum dccp_role dccps_role:2;
507d37cf ACM	516	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	517	__u8 dccps_hc_tx_insert_options:1;
97e5848d	518	struct timer_list dccps_xmit_timer;
7c657876	519	};
8109b02b	520
7c657876 ACM	521	static inline struct dccp_sock dccp_sk(const struct sock sk)
	522	{
	523	return (struct dccp_sock *)sk;
	524	}
	525
a4bf3902 ACM	526	static inline struct dccp_minisock dccp_msk(const struct sock sk)
	527	{
	528	return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
	529	}
	530
7c657876 ACM	531	static inline const char dccp_role(const struct sock sk)
	532	{
	533	switch (dccp_sk(sk)->dccps_role) {
	534	case DCCP_ROLE_UNDEFINED: return "undefined";
	535	case DCCP_ROLE_LISTEN: return "listen";
	536	case DCCP_ROLE_SERVER: return "server";
	537	case DCCP_ROLE_CLIENT: return "client";
	538	}
	539	return NULL;
	540	}
	541
5a47a470 HW	542	#endif /* __KERNEL__ */
5a47a470 HW	543
7c657876	544	#endif /* _LINUX_DCCP_H */