[net-next-2.6.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,
};
/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
#define DCCP_SINGLE_OPT_MAXLEN	253

/* 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		13
#define DCCP_SOCKOPT_TX_CCID		14
#define DCCP_SOCKOPT_RX_CCID		15
#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));
}

/**
 * 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_l_seq_win - local Sequence Window (influences ack number validity)
 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
 * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
 * @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_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;
	__u64				dccps_l_seq_win:48;
	__u64				dccps_r_seq_win:48;
	__u8				dccps_pcslen:4;
	__u8				dccps_pcrlen:4;
	__u8				dccps_send_ndp_count:1;
	__u64				dccps_ndp_count:48;
	unsigned long			dccps_rate_last;
	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 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	};
b20a9c24 GR	171	/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
b20a9c24 GR	172	#define DCCP_SINGLE_OPT_MAXLEN 253
7c657876	173
b83eff64 IM	174	/* DCCP CCIDS */
	175	enum {
	176	DCCPC_CCID2 = 2,
	177	DCCPC_CCID3 = 3,
	178	};
	179
c02fdc0e	180	/* DCCP features (RFC 4340 section 6.4) */
7d43d1a0	181	enum dccp_feature_numbers {
8109b02b ACM	182	DCCPF_RESERVED = 0,
8109b02b ACM	183	DCCPF_CCID = 1,
7d43d1a0	184	DCCPF_SHORT_SEQNOS = 2,
8109b02b	185	DCCPF_SEQUENCE_WINDOW = 3,
7d43d1a0	186	DCCPF_ECN_INCAPABLE = 4,
8109b02b ACM	187	DCCPF_ACK_RATIO = 5,
	188	DCCPF_SEND_ACK_VECTOR = 6,
	189	DCCPF_SEND_NDP_COUNT = 7,
6f4e5fff	190	DCCPF_MIN_CSUM_COVER = 8,
7d43d1a0	191	DCCPF_DATA_CHECKSUM = 9,
8109b02b ACM	192	/* 10-127 reserved */
8109b02b ACM	193	DCCPF_MIN_CCID_SPECIFIC = 128,
7d43d1a0	194	DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
8109b02b	195	DCCPF_MAX_CCID_SPECIFIC = 255,
7c657876 ACM	196	};
7c657876 ACM	197
a84ffe43	198	/* DCCP socket options */
5aed3243	199	#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
67e6b629	200	#define DCCP_SOCKOPT_SERVICE 2
afe00251 AB	201	#define DCCP_SOCKOPT_CHANGE_L 3
afe00251 AB	202	#define DCCP_SOCKOPT_CHANGE_R 4
7c559a9e	203	#define DCCP_SOCKOPT_GET_CUR_MPS 5
b8599d20	204	#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
6f4e5fff GR	205	#define DCCP_SOCKOPT_SEND_CSCOV 10
6f4e5fff GR	206	#define DCCP_SOCKOPT_RECV_CSCOV 11
d90ebcbf	207	#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
b20a9c24 GR	208	#define DCCP_SOCKOPT_CCID 13
	209	#define DCCP_SOCKOPT_TX_CCID 14
	210	#define DCCP_SOCKOPT_RX_CCID 15
88f964db ACM	211	#define DCCP_SOCKOPT_CCID_RX_INFO 128
88f964db ACM	212	#define DCCP_SOCKOPT_CCID_TX_INFO 192
67e6b629	213
09dbc389	214	/* maximum number of services provided on the same listening port */
67e6b629	215	#define DCCP_SERVICE_LIST_MAX_LEN 32
a84ffe43	216
5a47a470 HW	217	#ifdef __KERNEL__
	218
	219	#include <linux/in.h>
19ac2146	220	#include <linux/ktime.h>
5a47a470 HW	221	#include <linux/list.h>
	222	#include <linux/uio.h>
	223	#include <linux/workqueue.h>
	224
	225	#include <net/inet_connection_sock.h>
14c85021	226	#include <net/inet_sock.h>
64cf1e5d	227	#include <net/inet_timewait_sock.h>
5a47a470	228	#include <net/tcp_states.h>
5a47a470 HW	229
5a47a470 HW	230	enum dccp_state {
f11135a3 GR	231	DCCP_OPEN = TCP_ESTABLISHED,
	232	DCCP_REQUESTING = TCP_SYN_SENT,
	233	DCCP_LISTEN = TCP_LISTEN,
	234	DCCP_RESPOND = TCP_SYN_RECV,
	235	/*
	236	* States involved in closing a DCCP connection:
	237	* 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
	238	*
	239	* 2) CLOSING can have three different meanings (RFC 4340, 8.3):
	240	* a. Client has performed active-close, has sent a Close to the server
	241	* from state OPEN or PARTOPEN, and is waiting for the final Reset
	242	* (in this case, SOCK_DONE == 1).
	243	* b. Client is asked to perform passive-close, by receiving a CloseReq
	244	* in (PART)OPEN state. It sends a Close and waits for final Reset
	245	* (in this case, SOCK_DONE == 0).
	246	* c. Server performs an active-close as in (a), keeps TIMEWAIT state.
	247	*
	248	* 3) The following intermediate states are employed to give passively
	249	* closing nodes a chance to process their unread data:
	250	* - PASSIVE_CLOSE (from OPEN => CLOSED) and
	251	* - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
	252	*/
	253	DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
	254	DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
	255	DCCP_CLOSING = TCP_CLOSING,
	256	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	257	DCCP_CLOSED = TCP_CLOSE,
	258	DCCP_PARTOPEN = TCP_MAX_STATES,
	259	DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
9b91ad27	260	DCCP_MAX_STATES
5a47a470 HW	261	};
5a47a470 HW	262
f11135a3	263	#define DCCP_STATE_MASK 0x1f
5a47a470 HW	264
5a47a470 HW	265	enum {
f11135a3 GR	266	DCCPF_OPEN = TCPF_ESTABLISHED,
	267	DCCPF_REQUESTING = TCPF_SYN_SENT,
	268	DCCPF_LISTEN = TCPF_LISTEN,
	269	DCCPF_RESPOND = TCPF_SYN_RECV,
	270	DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
	271	DCCPF_CLOSING = TCPF_CLOSING,
	272	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	273	DCCPF_CLOSED = TCPF_CLOSE,
	274	DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
5a47a470 HW	275	};
	276
	277	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	278	{
9c70220b	279	return (struct dccp_hdr *)skb_transport_header(skb);
5a47a470 HW	280	}
5a47a470 HW	281
9b42078e GR	282	static inline struct dccp_hdr dccp_zeroed_hdr(struct sk_buff skb, int headlen)
9b42078e GR	283	{
badff6d0 ACM	284	skb_push(skb, headlen);
badff6d0 ACM	285	skb_reset_transport_header(skb);
9c70220b	286	return memset(skb_transport_header(skb), 0, headlen);
9b42078e GR	287	}
9b42078e GR	288
fde20105	289	static inline struct dccp_hdr_ext dccp_hdrx(const struct dccp_hdr dh)
5a47a470	290	{
fde20105	291	return (struct dccp_hdr_ext )((unsigned char )dh + sizeof(*dh));
5a47a470 HW	292	}
5a47a470 HW	293
1d3de414 HW	294	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	295	{
	296	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	297	}
	298
5a47a470 HW	299	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	300	{
	301	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	302	return __dccp_basic_hdr_len(dh);
5a47a470 HW	303	}
5a47a470 HW	304
fde20105	305	static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
5a47a470	306	{
60fe62e7	307	__u64 seq_nr = ntohs(dh->dccph_seq);
5a47a470 HW	308
5a47a470 HW	309	if (dh->dccph_x != 0)
fde20105	310	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
60fe62e7 AB	311	else
60fe62e7 AB	312	seq_nr += (u32)dh->dccph_seq2 << 16;
5a47a470 HW	313
	314	return seq_nr;
	315	}
	316
	317	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	318	{
9c70220b ACM	319	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
9c70220b ACM	320	dccp_basic_hdr_len(skb));
5a47a470 HW	321	}
	322
	323	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	324	{
9c70220b ACM	325	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
9c70220b ACM	326	dccp_basic_hdr_len(skb));
5a47a470 HW	327	}
	328
	329	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	330	{
	331	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
60fe62e7	332	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
5a47a470 HW	333	}
	334
	335	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	336	{
9c70220b ACM	337	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
9c70220b ACM	338	dccp_basic_hdr_len(skb));
5a47a470 HW	339	}
	340
	341	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	342	{
9c70220b ACM	343	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
9c70220b ACM	344	dccp_basic_hdr_len(skb));
5a47a470 HW	345	}
5a47a470 HW	346
1d3de414 HW	347	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	348	{
	349	return __dccp_basic_hdr_len(dh) +
	350	dccp_packet_hdr_len(dh->dccph_type);
	351	}
	352
5a47a470 HW	353	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	354	{
1d3de414	355	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	356	}
5a47a470 HW	357
b4d4f7c7 GR	358	/**
	359	* struct dccp_request_sock - represent DCCP-specific connection request
	360	* @dreq_inet_rsk: structure inherited from
	361	* @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
	362	* @dreq_isr: initial sequence number received on the Request
	363	* @dreq_service: service code present on the Request (there is just one)
ac75773c	364	* @dreq_featneg: feature negotiation options for this connection
b4d4f7c7 GR	365	* The following two fields are analogous to the ones in dccp_sock:
	366	* @dreq_timestamp_echo: last received timestamp to echo (13.1)
	367	* @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
	368	*/
7c657876 ACM	369	struct dccp_request_sock {
	370	struct inet_request_sock dreq_inet_rsk;
	371	__u64 dreq_iss;
	372	__u64 dreq_isr;
60fe62e7	373	__be32 dreq_service;
ac75773c	374	struct list_head dreq_featneg;
b4d4f7c7 GR	375	__u32 dreq_timestamp_echo;
b4d4f7c7 GR	376	__u32 dreq_timestamp_time;
7c657876 ACM	377	};
	378
	379	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	380	{
	381	return (struct dccp_request_sock *)req;
	382	}
	383
64cf1e5d ACM	384	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	385
8b819412 GR	386	extern int dccp_parse_options(struct sock sk, struct dccp_request_sock dreq,
	387	struct sk_buff *skb);
	388
7c657876	389	struct dccp_options_received {
5b5d0e70	390	u64 dccpor_ndp:48;
7c657876 ACM	391	u32 dccpor_timestamp;
	392	u32 dccpor_timestamp_echo;
	393	u32 dccpor_elapsed_time;
	394	};
	395
	396	struct ccid;
	397
	398	enum dccp_role {
	399	DCCP_ROLE_UNDEFINED,
	400	DCCP_ROLE_LISTEN,
	401	DCCP_ROLE_CLIENT,
	402	DCCP_ROLE_SERVER,
	403	};
	404
67e6b629 ACM	405	struct dccp_service_list {
67e6b629 ACM	406	__u32 dccpsl_nr;
60fe62e7	407	__be32 dccpsl_list[0];
67e6b629 ACM	408	};
	409
	410	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
8109b02b	411	#define DCCP_SERVICE_CODE_IS_ABSENT 0
67e6b629 ACM	412
67e6b629 ACM	413	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
60fe62e7	414	const __be32 service)
67e6b629 ACM	415	{
	416	if (likely(sl != NULL)) {
	417	u32 i = sl->dccpsl_nr;
	418	while (i--)
	419	if (sl->dccpsl_list[i] == service)
8109b02b	420	return 1;
67e6b629 ACM	421	}
	422	return 0;
	423	}
	424
ae31c339 ACM	425	struct dccp_ackvec;
ae31c339 ACM	426
7c657876 ACM	427	/**
	428	* struct dccp_sock - DCCP socket state
	429	*
	430	* @dccps_swl - sequence number window low
	431	* @dccps_swh - sequence number window high
	432	* @dccps_awl - acknowledgement number window low
	433	* @dccps_awh - acknowledgement number window high
	434	* @dccps_iss - initial sequence number sent
	435	* @dccps_isr - initial sequence number received
	436	* @dccps_osr - first OPEN sequence number received
	437	* @dccps_gss - greatest sequence number sent
	438	* @dccps_gsr - greatest valid sequence number received
	439	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
09dbc389 GR	440	* @dccps_service - first (passive sock) or unique (active sock) service code
09dbc389 GR	441	* @dccps_service_list - second .. last service code on passive socket
7c657876	442	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
b4d4f7c7	443	* @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
91d73c15 GR	444	* @dccps_l_ack_ratio - feature-local Ack Ratio
91d73c15 GR	445	* @dccps_r_ack_ratio - feature-remote Ack Ratio
792b4878 GR	446	* @dccps_l_seq_win - local Sequence Window (influences ack number validity)
792b4878 GR	447	* @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
6f4e5fff GR	448	* @dccps_pcslen - sender partial checksum coverage (via sockopt)
6f4e5fff GR	449	* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
4098dce5	450	* @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
7c657876	451	* @dccps_ndp_count - number of Non Data Packets since last data packet
91d73c15	452	* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
a94f0f97	453	* @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
ac75773c	454	* @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
ae31c339	455	* @dccps_hc_rx_ackvec - rx half connection ack vector
91d73c15 GR	456	* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
	457	* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
	458	* @dccps_options_received - parsed set of retrieved options
	459	* @dccps_role - role of this sock, one of %dccp_role
	460	* @dccps_hc_rx_insert_options - receiver wants to add options when acking
	461	* @dccps_hc_tx_insert_options - sender wants to add options when sending
b8599d20	462	* @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
97e5848d	463	* @dccps_xmit_timer - timer for when CCID is not ready to send
89560b53	464	* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
7c657876 ACM	465	*/
	466	struct dccp_sock {
	467	/* inet_connection_sock has to be the first member of dccp_sock */
	468	struct inet_connection_sock dccps_inet_connection;
89560b53	469	#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
7c657876 ACM	470	__u64 dccps_swl;
	471	__u64 dccps_swh;
	472	__u64 dccps_awl;
	473	__u64 dccps_awh;
	474	__u64 dccps_iss;
	475	__u64 dccps_isr;
	476	__u64 dccps_osr;
	477	__u64 dccps_gss;
	478	__u64 dccps_gsr;
	479	__u64 dccps_gar;
60fe62e7	480	__be32 dccps_service;
cf6b5fbe	481	__u32 dccps_mss_cache;
67e6b629	482	struct dccp_service_list *dccps_service_list;
7c657876	483	__u32 dccps_timestamp_echo;
b4d4f7c7	484	__u32 dccps_timestamp_time;
2a91aa39 AB	485	__u16 dccps_l_ack_ratio;
2a91aa39 AB	486	__u16 dccps_r_ack_ratio;
792b4878 GR	487	__u64 dccps_l_seq_win:48;
792b4878 GR	488	__u64 dccps_r_seq_win:48;
29450559 GR	489	__u8 dccps_pcslen:4;
29450559 GR	490	__u8 dccps_pcrlen:4;
4098dce5	491	__u8 dccps_send_ndp_count:1;
5b5d0e70	492	__u64 dccps_ndp_count:48;
a94f0f97	493	unsigned long dccps_rate_last;
ac75773c	494	struct list_head dccps_featneg;
ae31c339	495	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	496	struct ccid *dccps_hc_rx_ccid;
	497	struct ccid *dccps_hc_tx_ccid;
	498	struct dccp_options_received dccps_options_received;
	499	enum dccp_role dccps_role:2;
507d37cf ACM	500	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	501	__u8 dccps_hc_tx_insert_options:1;
b8599d20	502	__u8 dccps_server_timewait:1;
97e5848d	503	struct timer_list dccps_xmit_timer;
7c657876	504	};
8109b02b	505
7c657876 ACM	506	static inline struct dccp_sock dccp_sk(const struct sock sk)
	507	{
	508	return (struct dccp_sock *)sk;
	509	}
	510
	511	static inline const char dccp_role(const struct sock sk)
	512	{
	513	switch (dccp_sk(sk)->dccps_role) {
	514	case DCCP_ROLE_UNDEFINED: return "undefined";
	515	case DCCP_ROLE_LISTEN: return "listen";
	516	case DCCP_ROLE_SERVER: return "server";
	517	case DCCP_ROLE_CLIENT: return "client";
	518	}
	519	return NULL;
	520	}
	521
5a47a470 HW	522	#endif /* __KERNEL__ */
5a47a470 HW	523
7c657876	524	#endif /* _LINUX_DCCP_H */