[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 - Connection initiation request header
 *
 * @dccph_req_service - Service to which the client app wants to connect
 */
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 - Connection initiation response header
 *
 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
 */
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_ack - 48 bit Acknowledgment Number Subheader (5.6)
 * @dccph_reset_code - one of %dccp_reset_codes
 * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
 */
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_MAX_RESET_CODES		/* Leave at the end!  */
};

/* 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 dccp_feature_numbers {
	DCCPF_RESERVED = 0,
	DCCPF_CCID = 1,
	DCCPF_SHORT_SEQNOS = 2,
	DCCPF_SEQUENCE_WINDOW = 3,
	DCCPF_ECN_INCAPABLE = 4,
	DCCPF_ACK_RATIO = 5,
	DCCPF_SEND_ACK_VECTOR = 6,
	DCCPF_SEND_NDP_COUNT = 7,
	DCCPF_MIN_CSUM_COVER = 8,
	DCCPF_DATA_CHECKSUM = 9,
	/* 10-127 reserved */
	DCCPF_MIN_CCID_SPECIFIC = 128,
	DCCPF_SEND_LEV_RATE = 192,	/* RFC 4342, sec. 8.4 */
	DCCPF_MAX_CCID_SPECIFIC = 255,
};

/* 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_GET_CUR_MPS	5
#define DCCP_SOCKOPT_SERVER_TIMEWAIT	6
#define DCCP_SOCKOPT_SEND_CSCOV		10
#define DCCP_SOCKOPT_RECV_CSCOV		11
#define DCCP_SOCKOPT_AVAILABLE_CCIDS	12
#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_LISTEN	     = TCP_LISTEN,
	DCCP_RESPOND	     = TCP_SYN_RECV,
	/*
	 * States involved in closing a DCCP connection:
	 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
	 *
	 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
	 *  a. Client has performed active-close, has sent a Close to the server
	 *     from state OPEN or PARTOPEN, and is waiting for the final Reset
	 *     (in this case, SOCK_DONE == 1).
	 *  b. Client is asked to perform passive-close, by receiving a CloseReq
	 *     in (PART)OPEN state. It sends a Close and waits for final Reset
	 *     (in this case, SOCK_DONE == 0).
	 *  c. Server performs an active-close as in (a), keeps TIMEWAIT state.
	 *
	 * 3) The following intermediate states are employed to give passively
	 *    closing nodes a chance to process their unread data:
	 *    - PASSIVE_CLOSE    (from OPEN => CLOSED) and
	 *    - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
	 */
	DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
	DCCP_PASSIVE_CLOSE   = TCP_CLOSE_WAIT,	/* any node receiving a Close */
	DCCP_CLOSING	     = TCP_CLOSING,
	DCCP_TIME_WAIT	     = TCP_TIME_WAIT,
	DCCP_CLOSED	     = TCP_CLOSE,
	DCCP_PARTOPEN	     = TCP_MAX_STATES,
	DCCP_PASSIVE_CLOSEREQ,			/* clients receiving CloseReq */
	DCCP_MAX_STATES
};

#define DCCP_STATE_MASK 0x1f

enum {
	DCCPF_OPEN	      = TCPF_ESTABLISHED,
	DCCPF_REQUESTING      = TCPF_SYN_SENT,
	DCCPF_LISTEN	      = TCPF_LISTEN,
	DCCPF_RESPOND	      = TCPF_SYN_RECV,
	DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
	DCCPF_CLOSING	      = TCPF_CLOSING,
	DCCPF_TIME_WAIT	      = TCPF_TIME_WAIT,
	DCCPF_CLOSED	      = TCPF_CLOSE,
	DCCPF_PARTOPEN	      = (1 << DCCP_PARTOPEN),
};

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 dccp_hdr *dh)
{
	return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
}

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 dccp_hdr *dh)
{
	__u64 seq_nr =  ntohs(dh->dccph_seq);

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

/**
  * 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);

/**
 * struct dccp_request_sock  -  represent DCCP-specific connection request
 * @dreq_inet_rsk: structure inherited from
 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
 * @dreq_isr: initial sequence number received on the Request
 * @dreq_service: service code present on the Request (there is just one)
 * @dreq_featneg: feature negotiation options for this connection
 * The following two fields are analogous to the ones in dccp_sock:
 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
 */
struct dccp_request_sock {
	struct inet_request_sock dreq_inet_rsk;
	__u64			 dreq_iss;
	__u64			 dreq_isr;
	__be32			 dreq_service;
	struct list_head	 dreq_featneg;
	__u32			 dreq_timestamp_echo;
	__u32			 dreq_timestamp_time;
};

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;

extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
			      struct sk_buff *skb);

struct dccp_options_received {
	u64	dccpor_ndp:48;
	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_echo - latest timestamp received on a TIMESTAMP option
 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
 * @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_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
 * @dccps_minisock - associated minisock (accessed via dccp_msk)
 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
 * @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_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
 * @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;
	__u32				dccps_mss_cache;
	struct dccp_service_list	*dccps_service_list;
	__u32				dccps_timestamp_echo;
	__u32				dccps_timestamp_time;
	__u16				dccps_l_ack_ratio;
	__u16				dccps_r_ack_ratio;
	__u8				dccps_pcslen:4;
	__u8				dccps_pcrlen:4;
	__u64				dccps_ndp_count:48;
	unsigned long			dccps_rate_last;
	struct dccp_minisock		dccps_minisock;
	struct list_head		dccps_featneg;
	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;
	__u8				dccps_server_timewait: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	58	/**
0430ee34	59	* struct dccp_hdr_request - Connection initiation request header
7c657876 ACM	60	*
7c657876 ACM	61	* @dccph_req_service - Service to which the client app wants to connect
7c657876 ACM	62	*/
7c657876 ACM	63	struct dccp_hdr_request {
60fe62e7	64	__be32 dccph_req_service;
7c657876	65	};
7c657876 ACM	66	/**
	67	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	68	*
	69	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	70	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	71	*/
	72	struct dccp_hdr_ack_bits {
60fe62e7 AB	73	__be16 dccph_reserved1;
	74	__be16 dccph_ack_nr_high;
	75	__be32 dccph_ack_nr_low;
7c657876	76	};
7c657876	77	/**
0430ee34	78	* struct dccp_hdr_response - Connection initiation response header
7c657876	79	*
0430ee34	80	* @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
7c657876	81	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
7c657876 ACM	82	*/
	83	struct dccp_hdr_response {
	84	struct dccp_hdr_ack_bits dccph_resp_ack;
60fe62e7	85	__be32 dccph_resp_service;
7c657876 ACM	86	};
7c657876 ACM	87
7c657876 ACM	88	/**
	89	* struct dccp_hdr_reset - Unconditionally shut down a connection
	90	*
0430ee34 GR	91	* @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6)
	92	* @dccph_reset_code - one of %dccp_reset_codes
	93	* @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
7c657876 ACM	94	*/
	95	struct dccp_hdr_reset {
	96	struct dccp_hdr_ack_bits dccph_reset_ack;
	97	__u8 dccph_reset_code,
	98	dccph_reset_data[3];
	99	};
	100
7c657876 ACM	101	enum dccp_pkt_type {
	102	DCCP_PKT_REQUEST = 0,
	103	DCCP_PKT_RESPONSE,
	104	DCCP_PKT_DATA,
	105	DCCP_PKT_ACK,
	106	DCCP_PKT_DATAACK,
	107	DCCP_PKT_CLOSEREQ,
	108	DCCP_PKT_CLOSE,
	109	DCCP_PKT_RESET,
	110	DCCP_PKT_SYNC,
	111	DCCP_PKT_SYNCACK,
	112	DCCP_PKT_INVALID,
	113	};
	114
	115	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
	116
	117	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	118	{
	119	if (type == DCCP_PKT_DATA)
	120	return 0;
	121	if (type == DCCP_PKT_DATAACK \|\|
	122	type == DCCP_PKT_ACK \|\|
	123	type == DCCP_PKT_SYNC \|\|
	124	type == DCCP_PKT_SYNCACK \|\|
	125	type == DCCP_PKT_CLOSE \|\|
	126	type == DCCP_PKT_CLOSEREQ)
	127	return sizeof(struct dccp_hdr_ack_bits);
	128	if (type == DCCP_PKT_REQUEST)
	129	return sizeof(struct dccp_hdr_request);
	130	if (type == DCCP_PKT_RESPONSE)
	131	return sizeof(struct dccp_hdr_response);
	132	return sizeof(struct dccp_hdr_reset);
	133	}
7c657876 ACM	134	enum dccp_reset_codes {
	135	DCCP_RESET_CODE_UNSPECIFIED = 0,
	136	DCCP_RESET_CODE_CLOSED,
	137	DCCP_RESET_CODE_ABORTED,
	138	DCCP_RESET_CODE_NO_CONNECTION,
	139	DCCP_RESET_CODE_PACKET_ERROR,
	140	DCCP_RESET_CODE_OPTION_ERROR,
	141	DCCP_RESET_CODE_MANDATORY_ERROR,
	142	DCCP_RESET_CODE_CONNECTION_REFUSED,
	143	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	144	DCCP_RESET_CODE_TOO_BUSY,
	145	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	146	DCCP_RESET_CODE_AGGRESSION_PENALTY,
d8ef2c29 GR	147
d8ef2c29 GR	148	DCCP_MAX_RESET_CODES /* Leave at the end! */
7c657876 ACM	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) */
b4eec206	179	enum dccp_feature_numbers {
8109b02b ACM	180	DCCPF_RESERVED = 0,
8109b02b ACM	181	DCCPF_CCID = 1,
b4eec206	182	DCCPF_SHORT_SEQNOS = 2,
8109b02b	183	DCCPF_SEQUENCE_WINDOW = 3,
b4eec206	184	DCCPF_ECN_INCAPABLE = 4,
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,
b4eec206	189	DCCPF_DATA_CHECKSUM = 9,
8109b02b ACM	190	/* 10-127 reserved */
8109b02b ACM	191	DCCPF_MIN_CCID_SPECIFIC = 128,
b4eec206	192	DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
8109b02b	193	DCCPF_MAX_CCID_SPECIFIC = 255,
7c657876 ACM	194	};
7c657876 ACM	195
a84ffe43	196	/* DCCP socket options */
5aed3243	197	#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
67e6b629	198	#define DCCP_SOCKOPT_SERVICE 2
afe00251 AB	199	#define DCCP_SOCKOPT_CHANGE_L 3
afe00251 AB	200	#define DCCP_SOCKOPT_CHANGE_R 4
7c559a9e	201	#define DCCP_SOCKOPT_GET_CUR_MPS 5
b8599d20	202	#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
6f4e5fff GR	203	#define DCCP_SOCKOPT_SEND_CSCOV 10
6f4e5fff GR	204	#define DCCP_SOCKOPT_RECV_CSCOV 11
71bb4959	205	#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
88f964db ACM	206	#define DCCP_SOCKOPT_CCID_RX_INFO 128
88f964db ACM	207	#define DCCP_SOCKOPT_CCID_TX_INFO 192
67e6b629	208
09dbc389	209	/* maximum number of services provided on the same listening port */
67e6b629	210	#define DCCP_SERVICE_LIST_MAX_LEN 32
a84ffe43	211
5a47a470 HW	212	#ifdef __KERNEL__
	213
	214	#include <linux/in.h>
19ac2146	215	#include <linux/ktime.h>
5a47a470 HW	216	#include <linux/list.h>
	217	#include <linux/uio.h>
	218	#include <linux/workqueue.h>
	219
	220	#include <net/inet_connection_sock.h>
14c85021	221	#include <net/inet_sock.h>
64cf1e5d	222	#include <net/inet_timewait_sock.h>
5a47a470	223	#include <net/tcp_states.h>
5a47a470 HW	224
5a47a470 HW	225	enum dccp_state {
f11135a3 GR	226	DCCP_OPEN = TCP_ESTABLISHED,
	227	DCCP_REQUESTING = TCP_SYN_SENT,
	228	DCCP_LISTEN = TCP_LISTEN,
	229	DCCP_RESPOND = TCP_SYN_RECV,
	230	/*
	231	* States involved in closing a DCCP connection:
	232	* 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
	233	*
	234	* 2) CLOSING can have three different meanings (RFC 4340, 8.3):
	235	* a. Client has performed active-close, has sent a Close to the server
	236	* from state OPEN or PARTOPEN, and is waiting for the final Reset
	237	* (in this case, SOCK_DONE == 1).
	238	* b. Client is asked to perform passive-close, by receiving a CloseReq
	239	* in (PART)OPEN state. It sends a Close and waits for final Reset
	240	* (in this case, SOCK_DONE == 0).
	241	* c. Server performs an active-close as in (a), keeps TIMEWAIT state.
	242	*
	243	* 3) The following intermediate states are employed to give passively
	244	* closing nodes a chance to process their unread data:
	245	* - PASSIVE_CLOSE (from OPEN => CLOSED) and
	246	* - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
	247	*/
	248	DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
	249	DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
	250	DCCP_CLOSING = TCP_CLOSING,
	251	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	252	DCCP_CLOSED = TCP_CLOSE,
	253	DCCP_PARTOPEN = TCP_MAX_STATES,
	254	DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
9b91ad27	255	DCCP_MAX_STATES
5a47a470 HW	256	};
5a47a470 HW	257
f11135a3	258	#define DCCP_STATE_MASK 0x1f
5a47a470 HW	259
5a47a470 HW	260	enum {
f11135a3 GR	261	DCCPF_OPEN = TCPF_ESTABLISHED,
	262	DCCPF_REQUESTING = TCPF_SYN_SENT,
	263	DCCPF_LISTEN = TCPF_LISTEN,
	264	DCCPF_RESPOND = TCPF_SYN_RECV,
	265	DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
	266	DCCPF_CLOSING = TCPF_CLOSING,
	267	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	268	DCCPF_CLOSED = TCPF_CLOSE,
	269	DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
5a47a470 HW	270	};
	271
	272	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	273	{
9c70220b	274	return (struct dccp_hdr *)skb_transport_header(skb);
5a47a470 HW	275	}
5a47a470 HW	276
9b42078e GR	277	static inline struct dccp_hdr dccp_zeroed_hdr(struct sk_buff skb, int headlen)
9b42078e GR	278	{
badff6d0 ACM	279	skb_push(skb, headlen);
badff6d0 ACM	280	skb_reset_transport_header(skb);
9c70220b	281	return memset(skb_transport_header(skb), 0, headlen);
9b42078e GR	282	}
9b42078e GR	283
fde20105	284	static inline struct dccp_hdr_ext dccp_hdrx(const struct dccp_hdr dh)
5a47a470	285	{
fde20105	286	return (struct dccp_hdr_ext )((unsigned char )dh + sizeof(*dh));
5a47a470 HW	287	}
5a47a470 HW	288
1d3de414 HW	289	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	290	{
	291	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	292	}
	293
5a47a470 HW	294	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	295	{
	296	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	297	return __dccp_basic_hdr_len(dh);
5a47a470 HW	298	}
5a47a470 HW	299
fde20105	300	static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
5a47a470	301	{
60fe62e7	302	__u64 seq_nr = ntohs(dh->dccph_seq);
5a47a470 HW	303
5a47a470 HW	304	if (dh->dccph_x != 0)
fde20105	305	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
60fe62e7 AB	306	else
60fe62e7 AB	307	seq_nr += (u32)dh->dccph_seq2 << 16;
5a47a470 HW	308
	309	return seq_nr;
	310	}
	311
	312	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	313	{
9c70220b ACM	314	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
9c70220b ACM	315	dccp_basic_hdr_len(skb));
5a47a470 HW	316	}
	317
	318	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	319	{
9c70220b ACM	320	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
9c70220b ACM	321	dccp_basic_hdr_len(skb));
5a47a470 HW	322	}
	323
	324	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	325	{
	326	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
60fe62e7	327	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
5a47a470 HW	328	}
	329
	330	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	331	{
9c70220b ACM	332	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
9c70220b ACM	333	dccp_basic_hdr_len(skb));
5a47a470 HW	334	}
	335
	336	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	337	{
9c70220b ACM	338	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
9c70220b ACM	339	dccp_basic_hdr_len(skb));
5a47a470 HW	340	}
5a47a470 HW	341
1d3de414 HW	342	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	343	{
	344	return __dccp_basic_hdr_len(dh) +
	345	dccp_packet_hdr_len(dh->dccph_type);
	346	}
	347
5a47a470 HW	348	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	349	{
1d3de414	350	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	351	}
	352
	353
7c657876 ACM	354	/* initial values for each feature */
7c657876 ACM	355	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
afe00251	356	#define DCCPF_INITIAL_ACK_RATIO 2
b83eff64	357	#define DCCPF_INITIAL_CCID DCCPC_CCID2
2a91aa39	358	#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
7c657876 ACM	359	/* FIXME: for now we're default to 1 but it should really be 0 */
	360	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	361
7c657876	362	/**
a4bf3902 ACM	363	* struct dccp_minisock - Minimal DCCP connection representation
	364	*
	365	* Will be used to pass the state from dccp_request_sock to dccp_sock.
	366	*
	367	* @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
	368	* @dccpms_ccid - Congestion Control Id (CCID) (section 10)
	369	* @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
	370	* @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
09dbc389 GR	371	* @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
	372	* @dccpms_pending - List of features being negotiated
	373	* @dccpms_conf -
7c657876	374	*/
a4bf3902 ACM	375	struct dccp_minisock {
	376	__u64 dccpms_sequence_window;
	377	__u8 dccpms_rx_ccid;
	378	__u8 dccpms_tx_ccid;
	379	__u8 dccpms_send_ack_vector;
	380	__u8 dccpms_send_ndp_count;
	381	__u8 dccpms_ack_ratio;
	382	struct list_head dccpms_pending;
	383	struct list_head dccpms_conf;
afe00251 AB	384	};
	385
	386	struct dccp_opt_conf {
	387	__u8 *dccpoc_val;
	388	__u8 dccpoc_len;
	389	};
	390
	391	struct dccp_opt_pend {
	392	struct list_head dccpop_node;
	393	__u8 dccpop_type;
	394	__u8 dccpop_feat;
	395	__u8 *dccpop_val;
	396	__u8 dccpop_len;
	397	int dccpop_conf;
	398	struct dccp_opt_conf *dccpop_sc;
7c657876 ACM	399	};
7c657876 ACM	400
a4bf3902 ACM	401	extern void dccp_minisock_init(struct dccp_minisock *dmsk);
a4bf3902 ACM	402
b4d4f7c7 GR	403	/**
	404	* struct dccp_request_sock - represent DCCP-specific connection request
	405	* @dreq_inet_rsk: structure inherited from
	406	* @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
	407	* @dreq_isr: initial sequence number received on the Request
	408	* @dreq_service: service code present on the Request (there is just one)
828755ce	409	* @dreq_featneg: feature negotiation options for this connection
b4d4f7c7 GR	410	* The following two fields are analogous to the ones in dccp_sock:
	411	* @dreq_timestamp_echo: last received timestamp to echo (13.1)
	412	* @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
	413	*/
7c657876 ACM	414	struct dccp_request_sock {
	415	struct inet_request_sock dreq_inet_rsk;
	416	__u64 dreq_iss;
	417	__u64 dreq_isr;
60fe62e7	418	__be32 dreq_service;
828755ce	419	struct list_head dreq_featneg;
b4d4f7c7 GR	420	__u32 dreq_timestamp_echo;
b4d4f7c7 GR	421	__u32 dreq_timestamp_time;
7c657876 ACM	422	};
	423
	424	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	425	{
	426	return (struct dccp_request_sock *)req;
	427	}
	428
64cf1e5d ACM	429	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	430
8b819412 GR	431	extern int dccp_parse_options(struct sock sk, struct dccp_request_sock dreq,
	432	struct sk_buff *skb);
	433
7c657876	434	struct dccp_options_received {
5b5d0e70	435	u64 dccpor_ndp:48;
7c657876 ACM	436	u32 dccpor_timestamp;
	437	u32 dccpor_timestamp_echo;
	438	u32 dccpor_elapsed_time;
	439	};
	440
	441	struct ccid;
	442
	443	enum dccp_role {
	444	DCCP_ROLE_UNDEFINED,
	445	DCCP_ROLE_LISTEN,
	446	DCCP_ROLE_CLIENT,
	447	DCCP_ROLE_SERVER,
	448	};
	449
67e6b629 ACM	450	struct dccp_service_list {
67e6b629 ACM	451	__u32 dccpsl_nr;
60fe62e7	452	__be32 dccpsl_list[0];
67e6b629 ACM	453	};
	454
	455	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
8109b02b	456	#define DCCP_SERVICE_CODE_IS_ABSENT 0
67e6b629 ACM	457
67e6b629 ACM	458	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
60fe62e7	459	const __be32 service)
67e6b629 ACM	460	{
	461	if (likely(sl != NULL)) {
	462	u32 i = sl->dccpsl_nr;
	463	while (i--)
	464	if (sl->dccpsl_list[i] == service)
8109b02b	465	return 1;
67e6b629 ACM	466	}
	467	return 0;
	468	}
	469
ae31c339 ACM	470	struct dccp_ackvec;
ae31c339 ACM	471
7c657876 ACM	472	/**
	473	* struct dccp_sock - DCCP socket state
	474	*
	475	* @dccps_swl - sequence number window low
	476	* @dccps_swh - sequence number window high
	477	* @dccps_awl - acknowledgement number window low
	478	* @dccps_awh - acknowledgement number window high
	479	* @dccps_iss - initial sequence number sent
	480	* @dccps_isr - initial sequence number received
	481	* @dccps_osr - first OPEN sequence number received
	482	* @dccps_gss - greatest sequence number sent
	483	* @dccps_gsr - greatest valid sequence number received
	484	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
09dbc389 GR	485	* @dccps_service - first (passive sock) or unique (active sock) service code
09dbc389 GR	486	* @dccps_service_list - second .. last service code on passive socket
7c657876	487	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
b4d4f7c7	488	* @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
91d73c15 GR	489	* @dccps_l_ack_ratio - feature-local Ack Ratio
91d73c15 GR	490	* @dccps_r_ack_ratio - feature-remote Ack Ratio
6f4e5fff GR	491	* @dccps_pcslen - sender partial checksum coverage (via sockopt)
6f4e5fff GR	492	* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
7c657876	493	* @dccps_ndp_count - number of Non Data Packets since last data packet
91d73c15	494	* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
a94f0f97	495	* @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
91d73c15	496	* @dccps_minisock - associated minisock (accessed via dccp_msk)
828755ce	497	* @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
ae31c339	498	* @dccps_hc_rx_ackvec - rx half connection ack vector
91d73c15 GR	499	* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
	500	* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
	501	* @dccps_options_received - parsed set of retrieved options
	502	* @dccps_role - role of this sock, one of %dccp_role
	503	* @dccps_hc_rx_insert_options - receiver wants to add options when acking
	504	* @dccps_hc_tx_insert_options - sender wants to add options when sending
b8599d20	505	* @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
97e5848d	506	* @dccps_xmit_timer - timer for when CCID is not ready to send
89560b53	507	* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
7c657876 ACM	508	*/
	509	struct dccp_sock {
	510	/* inet_connection_sock has to be the first member of dccp_sock */
	511	struct inet_connection_sock dccps_inet_connection;
89560b53	512	#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
7c657876 ACM	513	__u64 dccps_swl;
	514	__u64 dccps_swh;
	515	__u64 dccps_awl;
	516	__u64 dccps_awh;
	517	__u64 dccps_iss;
	518	__u64 dccps_isr;
	519	__u64 dccps_osr;
	520	__u64 dccps_gss;
	521	__u64 dccps_gsr;
	522	__u64 dccps_gar;
60fe62e7	523	__be32 dccps_service;
cf6b5fbe	524	__u32 dccps_mss_cache;
67e6b629	525	struct dccp_service_list *dccps_service_list;
7c657876	526	__u32 dccps_timestamp_echo;
b4d4f7c7	527	__u32 dccps_timestamp_time;
2a91aa39 AB	528	__u16 dccps_l_ack_ratio;
2a91aa39 AB	529	__u16 dccps_r_ack_ratio;
20f41eee GR	530	__u8 dccps_pcslen:4;
20f41eee GR	531	__u8 dccps_pcrlen:4;
5b5d0e70	532	__u64 dccps_ndp_count:48;
a94f0f97	533	unsigned long dccps_rate_last;
a4bf3902	534	struct dccp_minisock dccps_minisock;
828755ce	535	struct list_head dccps_featneg;
ae31c339	536	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	537	struct ccid *dccps_hc_rx_ccid;
	538	struct ccid *dccps_hc_tx_ccid;
	539	struct dccp_options_received dccps_options_received;
	540	enum dccp_role dccps_role:2;
507d37cf ACM	541	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	542	__u8 dccps_hc_tx_insert_options:1;
b8599d20	543	__u8 dccps_server_timewait:1;
97e5848d	544	struct timer_list dccps_xmit_timer;
7c657876	545	};
8109b02b	546
7c657876 ACM	547	static inline struct dccp_sock dccp_sk(const struct sock sk)
	548	{
	549	return (struct dccp_sock *)sk;
	550	}
	551
a4bf3902 ACM	552	static inline struct dccp_minisock dccp_msk(const struct sock sk)
	553	{
	554	return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
	555	}
	556
7c657876 ACM	557	static inline const char dccp_role(const struct sock sk)
	558	{
	559	switch (dccp_sk(sk)->dccps_role) {
	560	case DCCP_ROLE_UNDEFINED: return "undefined";
	561	case DCCP_ROLE_LISTEN: return "listen";
	562	case DCCP_ROLE_SERVER: return "server";
	563	case DCCP_ROLE_CLIENT: return "client";
	564	}
	565	return NULL;
	566	}
	567
5a47a470 HW	568	#endif /* __KERNEL__ */
5a47a470 HW	569
7c657876	570	#endif /* _LINUX_DCCP_H */