[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 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_GET_CUR_MPS	5
#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 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

#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 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_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
 * @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;
	unsigned long			dccps_rate_last;
	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	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,
	147	};
	148
	149	/* DCCP options */
	150	enum {
	151	DCCPO_PADDING = 0,
	152	DCCPO_MANDATORY = 1,
	153	DCCPO_MIN_RESERVED = 3,
	154	DCCPO_MAX_RESERVED = 31,
afe00251 AB	155	DCCPO_CHANGE_L = 32,
	156	DCCPO_CONFIRM_L = 33,
	157	DCCPO_CHANGE_R = 34,
	158	DCCPO_CONFIRM_R = 35,
7c657876 ACM	159	DCCPO_NDP_COUNT = 37,
	160	DCCPO_ACK_VECTOR_0 = 38,
	161	DCCPO_ACK_VECTOR_1 = 39,
	162	DCCPO_TIMESTAMP = 41,
	163	DCCPO_TIMESTAMP_ECHO = 42,
	164	DCCPO_ELAPSED_TIME = 43,
	165	DCCPO_MAX = 45,
	166	DCCPO_MIN_CCID_SPECIFIC = 128,
	167	DCCPO_MAX_CCID_SPECIFIC = 255,
	168	};
	169
b83eff64 IM	170	/* DCCP CCIDS */
	171	enum {
	172	DCCPC_CCID2 = 2,
	173	DCCPC_CCID3 = 3,
	174	};
	175
c02fdc0e	176	/* DCCP features (RFC 4340 section 6.4) */
8109b02b ACM	177	enum {
	178	DCCPF_RESERVED = 0,
	179	DCCPF_CCID = 1,
c02fdc0e	180	DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
8109b02b	181	DCCPF_SEQUENCE_WINDOW = 3,
c02fdc0e	182	DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
8109b02b ACM	183	DCCPF_ACK_RATIO = 5,
	184	DCCPF_SEND_ACK_VECTOR = 6,
	185	DCCPF_SEND_NDP_COUNT = 7,
6f4e5fff	186	DCCPF_MIN_CSUM_COVER = 8,
c02fdc0e	187	DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
8109b02b ACM	188	/* 10-127 reserved */
	189	DCCPF_MIN_CCID_SPECIFIC = 128,
	190	DCCPF_MAX_CCID_SPECIFIC = 255,
7c657876 ACM	191	};
7c657876 ACM	192
afe00251 AB	193	/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
	194	struct dccp_so_feat {
	195	__u8 dccpsf_feat;
1acc04cd	196	__u8 __user *dccpsf_val;
afe00251 AB	197	__u8 dccpsf_len;
	198	};
	199
a84ffe43	200	/* DCCP socket options */
5aed3243	201	#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
67e6b629	202	#define DCCP_SOCKOPT_SERVICE 2
afe00251 AB	203	#define DCCP_SOCKOPT_CHANGE_L 3
afe00251 AB	204	#define DCCP_SOCKOPT_CHANGE_R 4
7c559a9e	205	#define DCCP_SOCKOPT_GET_CUR_MPS 5
6f4e5fff GR	206	#define DCCP_SOCKOPT_SEND_CSCOV 10
6f4e5fff GR	207	#define DCCP_SOCKOPT_RECV_CSCOV 11
88f964db ACM	208	#define DCCP_SOCKOPT_CCID_RX_INFO 128
88f964db ACM	209	#define DCCP_SOCKOPT_CCID_TX_INFO 192
67e6b629	210
09dbc389	211	/* maximum number of services provided on the same listening port */
67e6b629	212	#define DCCP_SERVICE_LIST_MAX_LEN 32
a84ffe43	213
5a47a470 HW	214	#ifdef __KERNEL__
	215
	216	#include <linux/in.h>
19ac2146	217	#include <linux/ktime.h>
5a47a470 HW	218	#include <linux/list.h>
	219	#include <linux/uio.h>
	220	#include <linux/workqueue.h>
	221
	222	#include <net/inet_connection_sock.h>
14c85021	223	#include <net/inet_sock.h>
64cf1e5d	224	#include <net/inet_timewait_sock.h>
5a47a470	225	#include <net/tcp_states.h>
5a47a470 HW	226
	227	enum dccp_state {
	228	DCCP_OPEN = TCP_ESTABLISHED,
	229	DCCP_REQUESTING = TCP_SYN_SENT,
	230	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	231	This mapping is horrible, but TCP has
	232	no matching state for DCCP_PARTOPEN,
	233	as TCP_SYN_RECV is already used by
	234	DCCP_RESPOND, why don't stop using TCP
	235	mapping of states? OK, now we don't use
	236	sk_stream_sendmsg anymore, so doesn't
	237	seem to exist any reason for us to
	238	do the TCP mapping here */
	239	DCCP_LISTEN = TCP_LISTEN,
	240	DCCP_RESPOND = TCP_SYN_RECV,
	241	DCCP_CLOSING = TCP_CLOSING,
	242	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	243	DCCP_CLOSED = TCP_CLOSE,
	244	DCCP_MAX_STATES = TCP_MAX_STATES,
	245	};
	246
	247	#define DCCP_STATE_MASK 0xf
	248	#define DCCP_ACTION_FIN (1<<7)
	249
	250	enum {
	251	DCCPF_OPEN = TCPF_ESTABLISHED,
	252	DCCPF_REQUESTING = TCPF_SYN_SENT,
	253	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	254	DCCPF_LISTEN = TCPF_LISTEN,
	255	DCCPF_RESPOND = TCPF_SYN_RECV,
	256	DCCPF_CLOSING = TCPF_CLOSING,
	257	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	258	DCCPF_CLOSED = TCPF_CLOSE,
	259	};
	260
	261	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	262	{
9c70220b	263	return (struct dccp_hdr *)skb_transport_header(skb);
5a47a470 HW	264	}
5a47a470 HW	265
9b42078e GR	266	static inline struct dccp_hdr dccp_zeroed_hdr(struct sk_buff skb, int headlen)
9b42078e GR	267	{
badff6d0 ACM	268	skb_push(skb, headlen);
badff6d0 ACM	269	skb_reset_transport_header(skb);
9c70220b	270	return memset(skb_transport_header(skb), 0, headlen);
9b42078e GR	271	}
9b42078e GR	272
fde20105	273	static inline struct dccp_hdr_ext dccp_hdrx(const struct dccp_hdr dh)
5a47a470	274	{
fde20105	275	return (struct dccp_hdr_ext )((unsigned char )dh + sizeof(*dh));
5a47a470 HW	276	}
5a47a470 HW	277
1d3de414 HW	278	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	279	{
	280	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	281	}
	282
5a47a470 HW	283	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	284	{
	285	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	286	return __dccp_basic_hdr_len(dh);
5a47a470 HW	287	}
5a47a470 HW	288
fde20105	289	static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
5a47a470	290	{
60fe62e7	291	__u64 seq_nr = ntohs(dh->dccph_seq);
5a47a470 HW	292
5a47a470 HW	293	if (dh->dccph_x != 0)
fde20105	294	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
60fe62e7 AB	295	else
60fe62e7 AB	296	seq_nr += (u32)dh->dccph_seq2 << 16;
5a47a470 HW	297
	298	return seq_nr;
	299	}
	300
	301	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	302	{
9c70220b ACM	303	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
9c70220b ACM	304	dccp_basic_hdr_len(skb));
5a47a470 HW	305	}
	306
	307	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	308	{
9c70220b ACM	309	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
9c70220b ACM	310	dccp_basic_hdr_len(skb));
5a47a470 HW	311	}
	312
	313	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	314	{
	315	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
60fe62e7	316	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
5a47a470 HW	317	}
	318
	319	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	320	{
9c70220b ACM	321	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
9c70220b ACM	322	dccp_basic_hdr_len(skb));
5a47a470 HW	323	}
	324
	325	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	326	{
9c70220b ACM	327	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
9c70220b ACM	328	dccp_basic_hdr_len(skb));
5a47a470 HW	329	}
5a47a470 HW	330
1d3de414 HW	331	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	332	{
	333	return __dccp_basic_hdr_len(dh) +
	334	dccp_packet_hdr_len(dh->dccph_type);
	335	}
	336
5a47a470 HW	337	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	338	{
1d3de414	339	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	340	}
	341
	342
7c657876 ACM	343	/* initial values for each feature */
7c657876 ACM	344	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
afe00251	345	#define DCCPF_INITIAL_ACK_RATIO 2
b83eff64	346	#define DCCPF_INITIAL_CCID DCCPC_CCID2
2a91aa39	347	#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
7c657876 ACM	348	/* FIXME: for now we're default to 1 but it should really be 0 */
	349	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	350
	351	#define DCCP_NDP_LIMIT 0xFFFFFF
	352
	353	/**
a4bf3902 ACM	354	* struct dccp_minisock - Minimal DCCP connection representation
	355	*
	356	* Will be used to pass the state from dccp_request_sock to dccp_sock.
	357	*
	358	* @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
	359	* @dccpms_ccid - Congestion Control Id (CCID) (section 10)
	360	* @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
	361	* @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
09dbc389 GR	362	* @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
	363	* @dccpms_pending - List of features being negotiated
	364	* @dccpms_conf -
7c657876	365	*/
a4bf3902 ACM	366	struct dccp_minisock {
	367	__u64 dccpms_sequence_window;
	368	__u8 dccpms_rx_ccid;
	369	__u8 dccpms_tx_ccid;
	370	__u8 dccpms_send_ack_vector;
	371	__u8 dccpms_send_ndp_count;
	372	__u8 dccpms_ack_ratio;
	373	struct list_head dccpms_pending;
	374	struct list_head dccpms_conf;
afe00251 AB	375	};
	376
	377	struct dccp_opt_conf {
	378	__u8 *dccpoc_val;
	379	__u8 dccpoc_len;
	380	};
	381
	382	struct dccp_opt_pend {
	383	struct list_head dccpop_node;
	384	__u8 dccpop_type;
	385	__u8 dccpop_feat;
	386	__u8 *dccpop_val;
	387	__u8 dccpop_len;
	388	int dccpop_conf;
	389	struct dccp_opt_conf *dccpop_sc;
7c657876 ACM	390	};
7c657876 ACM	391
a4bf3902 ACM	392	extern void dccp_minisock_init(struct dccp_minisock *dmsk);
a4bf3902 ACM	393
7c657876 ACM	394	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	395
	396	struct dccp_request_sock {
	397	struct inet_request_sock dreq_inet_rsk;
	398	__u64 dreq_iss;
	399	__u64 dreq_isr;
60fe62e7	400	__be32 dreq_service;
7c657876 ACM	401	};
	402
	403	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	404	{
	405	return (struct dccp_request_sock *)req;
	406	}
	407
64cf1e5d ACM	408	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	409
7c657876	410	struct dccp_options_received {
ae31c339	411	u32 dccpor_ndp; /* only 24 bits */
7c657876 ACM	412	u32 dccpor_timestamp;
	413	u32 dccpor_timestamp_echo;
	414	u32 dccpor_elapsed_time;
	415	};
	416
	417	struct ccid;
	418
	419	enum dccp_role {
	420	DCCP_ROLE_UNDEFINED,
	421	DCCP_ROLE_LISTEN,
	422	DCCP_ROLE_CLIENT,
	423	DCCP_ROLE_SERVER,
	424	};
	425
67e6b629 ACM	426	struct dccp_service_list {
67e6b629 ACM	427	__u32 dccpsl_nr;
60fe62e7	428	__be32 dccpsl_list[0];
67e6b629 ACM	429	};
	430
	431	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
8109b02b	432	#define DCCP_SERVICE_CODE_IS_ABSENT 0
67e6b629 ACM	433
67e6b629 ACM	434	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
60fe62e7	435	const __be32 service)
67e6b629 ACM	436	{
	437	if (likely(sl != NULL)) {
	438	u32 i = sl->dccpsl_nr;
	439	while (i--)
	440	if (sl->dccpsl_list[i] == service)
8109b02b	441	return 1;
67e6b629 ACM	442	}
	443	return 0;
	444	}
	445
ae31c339 ACM	446	struct dccp_ackvec;
ae31c339 ACM	447
7c657876 ACM	448	/**
	449	* struct dccp_sock - DCCP socket state
	450	*
	451	* @dccps_swl - sequence number window low
	452	* @dccps_swh - sequence number window high
	453	* @dccps_awl - acknowledgement number window low
	454	* @dccps_awh - acknowledgement number window high
	455	* @dccps_iss - initial sequence number sent
	456	* @dccps_isr - initial sequence number received
	457	* @dccps_osr - first OPEN sequence number received
	458	* @dccps_gss - greatest sequence number sent
	459	* @dccps_gsr - greatest valid sequence number received
	460	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
09dbc389 GR	461	* @dccps_service - first (passive sock) or unique (active sock) service code
09dbc389 GR	462	* @dccps_service_list - second .. last service code on passive socket
7c657876 ACM	463	* @dccps_timestamp_time - time of latest TIMESTAMP option
7c657876 ACM	464	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
91d73c15 GR	465	* @dccps_l_ack_ratio - feature-local Ack Ratio
91d73c15 GR	466	* @dccps_r_ack_ratio - feature-remote Ack Ratio
6f4e5fff GR	467	* @dccps_pcslen - sender partial checksum coverage (via sockopt)
6f4e5fff GR	468	* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
7c657876	469	* @dccps_ndp_count - number of Non Data Packets since last data packet
91d73c15	470	* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
a94f0f97	471	* @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
91d73c15	472	* @dccps_minisock - associated minisock (accessed via dccp_msk)
ae31c339	473	* @dccps_hc_rx_ackvec - rx half connection ack vector
91d73c15 GR	474	* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
	475	* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
	476	* @dccps_options_received - parsed set of retrieved options
	477	* @dccps_role - role of this sock, one of %dccp_role
	478	* @dccps_hc_rx_insert_options - receiver wants to add options when acking
	479	* @dccps_hc_tx_insert_options - sender wants to add options when sending
97e5848d	480	* @dccps_xmit_timer - timer for when CCID is not ready to send
89560b53	481	* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
7c657876 ACM	482	*/
	483	struct dccp_sock {
	484	/* inet_connection_sock has to be the first member of dccp_sock */
	485	struct inet_connection_sock dccps_inet_connection;
89560b53	486	#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
7c657876 ACM	487	__u64 dccps_swl;
	488	__u64 dccps_swh;
	489	__u64 dccps_awl;
	490	__u64 dccps_awh;
	491	__u64 dccps_iss;
	492	__u64 dccps_isr;
	493	__u64 dccps_osr;
	494	__u64 dccps_gss;
	495	__u64 dccps_gsr;
	496	__u64 dccps_gar;
60fe62e7	497	__be32 dccps_service;
67e6b629	498	struct dccp_service_list *dccps_service_list;
19ac2146	499	ktime_t dccps_timestamp_time;
7c657876	500	__u32 dccps_timestamp_echo;
2a91aa39 AB	501	__u16 dccps_l_ack_ratio;
2a91aa39 AB	502	__u16 dccps_r_ack_ratio;
6f4e5fff GR	503	__u16 dccps_pcslen;
6f4e5fff GR	504	__u16 dccps_pcrlen;
7c657876	505	unsigned long dccps_ndp_count;
7c657876	506	__u32 dccps_mss_cache;
a94f0f97	507	unsigned long dccps_rate_last;
a4bf3902	508	struct dccp_minisock dccps_minisock;
ae31c339	509	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	510	struct ccid *dccps_hc_rx_ccid;
	511	struct ccid *dccps_hc_tx_ccid;
	512	struct dccp_options_received dccps_options_received;
	513	enum dccp_role dccps_role:2;
507d37cf ACM	514	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	515	__u8 dccps_hc_tx_insert_options:1;
97e5848d	516	struct timer_list dccps_xmit_timer;
7c657876	517	};
8109b02b	518
7c657876 ACM	519	static inline struct dccp_sock dccp_sk(const struct sock sk)
	520	{
	521	return (struct dccp_sock *)sk;
	522	}
	523
a4bf3902 ACM	524	static inline struct dccp_minisock dccp_msk(const struct sock sk)
	525	{
	526	return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
	527	}
	528
7c657876 ACM	529	static inline const char dccp_role(const struct sock sk)
	530	{
	531	switch (dccp_sk(sk)->dccps_role) {
	532	case DCCP_ROLE_UNDEFINED: return "undefined";
	533	case DCCP_ROLE_LISTEN: return "listen";
	534	case DCCP_ROLE_SERVER: return "server";
	535	case DCCP_ROLE_CLIENT: return "client";
	536	}
	537	return NULL;
	538	}
	539
5a47a470 HW	540	#endif /* __KERNEL__ */
5a47a470 HW	541
7c657876	542	#endif /* _LINUX_DCCP_H */