[mirror_ubuntu-bionic-kernel.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 {
	__u16	dccph_sport,
		dccph_dport;
	__u8	dccph_doff;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8	dccph_cscov:4,
		dccph_ccval:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8	dccph_ccval:4,
		dccph_cscov:4;
#else
#error  "Adjust your <asm/byteorder.h> defines"
#endif
	__u16	dccph_checksum;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u32	dccph_x:1,
		dccph_type:4,
		dccph_reserved:3,
		dccph_seq:24;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u32	dccph_reserved:3,
		dccph_type:4,
		dccph_x:1,
		dccph_seq:24;
#else
#error  "Adjust your <asm/byteorder.h> defines"
#endif
};

/**
 * 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 {
	__u32	dccph_seq_low;
};

/**
 * struct dccp_hdr_request - Conection initiation request header
 *
 * @dccph_req_service - Service to which the client app wants to connect
 * @dccph_req_options - list of options (must be a multiple of 32 bits
 */
struct dccp_hdr_request {
	__u32	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 {
	__u32	dccph_reserved1:8,
		dccph_ack_nr_high:24;
	__u32	dccph_ack_nr_low;
};
/**
 * struct dccp_hdr_response - Conection initiation response header
 *
 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
 * @dccph_resp_options - list of options (must be a multiple of 32 bits
 */
struct dccp_hdr_response {
	struct dccp_hdr_ack_bits	dccph_resp_ack;
	__u32				dccph_resp_service;
};

/**
 * struct dccp_hdr_reset - Unconditionally shut down a connection
 *
 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 * @dccph_reset_options - list of options (must be a multiple of 32 bits
 */
struct dccp_hdr_reset {
	struct dccp_hdr_ack_bits	dccph_reset_ack;
	__u8				dccph_reset_code,
					dccph_reset_data[3];
};

enum dccp_pkt_type {
	DCCP_PKT_REQUEST = 0,
	DCCP_PKT_RESPONSE,
	DCCP_PKT_DATA,
	DCCP_PKT_ACK,
	DCCP_PKT_DATAACK,
	DCCP_PKT_CLOSEREQ,
	DCCP_PKT_CLOSE,
	DCCP_PKT_RESET,
	DCCP_PKT_SYNC,
	DCCP_PKT_SYNCACK,
	DCCP_PKT_INVALID,
};

#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID

static inline unsigned int dccp_packet_hdr_len(const __u8 type)
{
	if (type == DCCP_PKT_DATA)
		return 0;
	if (type == DCCP_PKT_DATAACK	||
	    type == DCCP_PKT_ACK	||
	    type == DCCP_PKT_SYNC	||
	    type == DCCP_PKT_SYNCACK	||
	    type == DCCP_PKT_CLOSE	||
	    type == DCCP_PKT_CLOSEREQ)
		return sizeof(struct dccp_hdr_ack_bits);
	if (type == DCCP_PKT_REQUEST)
		return sizeof(struct dccp_hdr_request);
	if (type == DCCP_PKT_RESPONSE)
		return sizeof(struct dccp_hdr_response);
	return sizeof(struct dccp_hdr_reset);
}
enum dccp_reset_codes {
	DCCP_RESET_CODE_UNSPECIFIED = 0,
	DCCP_RESET_CODE_CLOSED,
	DCCP_RESET_CODE_ABORTED,
	DCCP_RESET_CODE_NO_CONNECTION,
	DCCP_RESET_CODE_PACKET_ERROR,
	DCCP_RESET_CODE_OPTION_ERROR,
	DCCP_RESET_CODE_MANDATORY_ERROR,
	DCCP_RESET_CODE_CONNECTION_REFUSED,
	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	DCCP_RESET_CODE_TOO_BUSY,
	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	DCCP_RESET_CODE_AGGRESSION_PENALTY,
};

/* DCCP options */
enum {
	DCCPO_PADDING = 0,
	DCCPO_MANDATORY = 1,
	DCCPO_MIN_RESERVED = 3,
	DCCPO_MAX_RESERVED = 31,
	DCCPO_NDP_COUNT = 37,
	DCCPO_ACK_VECTOR_0 = 38,
	DCCPO_ACK_VECTOR_1 = 39,
	DCCPO_TIMESTAMP = 41,
	DCCPO_TIMESTAMP_ECHO = 42,
	DCCPO_ELAPSED_TIME = 43,
	DCCPO_MAX = 45,
	DCCPO_MIN_CCID_SPECIFIC = 128,
	DCCPO_MAX_CCID_SPECIFIC = 255,
};

/* DCCP features */
enum {
	DCCPF_RESERVED = 0,
	DCCPF_SEQUENCE_WINDOW = 3,
	DCCPF_SEND_ACK_VECTOR = 6,
	DCCPF_SEND_NDP_COUNT = 7,
	/* 10-127 reserved */
	DCCPF_MIN_CCID_SPECIFIC = 128,
	DCCPF_MAX_CCID_SPECIFIC = 255,
};

/* DCCP socket options */
#define DCCP_SOCKOPT_PACKET_SIZE	1
#define DCCP_SOCKOPT_SERVICE		2

#define DCCP_SERVICE_LIST_MAX_LEN      32

#ifdef __KERNEL__

#include <linux/in.h>
#include <linux/list.h>
#include <linux/uio.h>
#include <linux/workqueue.h>

#include <net/inet_connection_sock.h>
#include <net/inet_timewait_sock.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/tcp.h>

enum dccp_state {
	DCCP_OPEN	= TCP_ESTABLISHED,
	DCCP_REQUESTING	= TCP_SYN_SENT,
	DCCP_PARTOPEN	= TCP_FIN_WAIT1, /* FIXME:
					    This mapping is horrible, but TCP has
					    no matching state for DCCP_PARTOPEN,
					    as TCP_SYN_RECV is already used by
					    DCCP_RESPOND, why don't stop using TCP
					    mapping of states? OK, now we don't use
					    sk_stream_sendmsg anymore, so doesn't
					    seem to exist any reason for us to
					    do the TCP mapping here */
	DCCP_LISTEN	= TCP_LISTEN,
	DCCP_RESPOND	= TCP_SYN_RECV,
	DCCP_CLOSING	= TCP_CLOSING,
	DCCP_TIME_WAIT	= TCP_TIME_WAIT,
	DCCP_CLOSED	= TCP_CLOSE,
	DCCP_MAX_STATES = TCP_MAX_STATES,
};

#define DCCP_STATE_MASK 0xf
#define DCCP_ACTION_FIN (1<<7)

enum {
	DCCPF_OPEN	 = TCPF_ESTABLISHED,
	DCCPF_REQUESTING = TCPF_SYN_SENT,
	DCCPF_PARTOPEN	 = TCPF_FIN_WAIT1,
	DCCPF_LISTEN	 = TCPF_LISTEN,
	DCCPF_RESPOND	 = TCPF_SYN_RECV,
	DCCPF_CLOSING	 = TCPF_CLOSING,
	DCCPF_TIME_WAIT	 = TCPF_TIME_WAIT,
	DCCPF_CLOSED	 = TCPF_CLOSE,
};

static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
{
	return (struct dccp_hdr *)skb->h.raw;
}

static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
{
	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
}

static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
{
	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
}

static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
{
	const struct dccp_hdr *dh = dccp_hdr(skb);
	return __dccp_basic_hdr_len(dh);
}

static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
{
	const struct dccp_hdr *dh = dccp_hdr(skb);
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u64 seq_nr = ntohl(dh->dccph_seq);
#else
#error  "Adjust your <asm/byteorder.h> defines"
#endif

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

	return seq_nr;
}

static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
{
	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
}

static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
{
	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
}

static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
{
	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
#if defined(__LITTLE_ENDIAN_BITFIELD)
	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
#elif defined(__BIG_ENDIAN_BITFIELD)
	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
#else
#error  "Adjust your <asm/byteorder.h> defines"
#endif
}

static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
{
	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
}

static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
{
	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
}

static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
{
	return __dccp_basic_hdr_len(dh) +
	       dccp_packet_hdr_len(dh->dccph_type);
}

static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
{
	return __dccp_hdr_len(dccp_hdr(skb));
}


/* initial values for each feature */
#define DCCPF_INITIAL_SEQUENCE_WINDOW		100
/* FIXME: for now we're using CCID 3 (TFRC) */
#define DCCPF_INITIAL_CCID			3
#define DCCPF_INITIAL_SEND_ACK_VECTOR		0
/* 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_options - option values for a DCCP connection
  *	@dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
  *	@dccpo_ccid - Congestion Control Id (CCID) (section 10)
  *	@dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
  *	@dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
  */
struct dccp_options {
	__u64	dccpo_sequence_window;
	__u8	dccpo_rx_ccid;
	__u8	dccpo_tx_ccid;
	__u8	dccpo_send_ack_vector;
	__u8	dccpo_send_ndp_count;
};

extern void __dccp_options_init(struct dccp_options *dccpo);
extern void dccp_options_init(struct dccp_options *dccpo);
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;
	__u32			 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;
	__u32	dccpsl_list[0];
};

#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)

static inline int dccp_list_has_service(const struct dccp_service_list *sl,
					const u32 service)
{
	if (likely(sl != NULL)) {
		u32 i = sl->dccpsl_nr;
		while (i--)
			if (sl->dccpsl_list[i] == service)
				return 1; 
	}
	return 0;
}

struct dccp_ackvec;

/**
 * struct dccp_sock - DCCP socket state
 *
 * @dccps_swl - sequence number window low
 * @dccps_swh - sequence number window high
 * @dccps_awl - acknowledgement number window low
 * @dccps_awh - acknowledgement number window high
 * @dccps_iss - initial sequence number sent
 * @dccps_isr - initial sequence number received
 * @dccps_osr - first OPEN sequence number received
 * @dccps_gss - greatest sequence number sent
 * @dccps_gsr - greatest valid sequence number received
 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
 * @dccps_timestamp_time - time of latest TIMESTAMP option
 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
 * @dccps_pmtu_cookie - Last pmtu seen by socket
 * @dccps_packet_size - Set thru setsockopt
 * @dccps_role - Role of this sock, one of %dccp_role
 * @dccps_ndp_count - number of Non Data Packets since last data packet
 * @dccps_hc_rx_ackvec - rx half connection ack vector
 */
struct dccp_sock {
	/* inet_connection_sock has to be the first member of dccp_sock */
	struct inet_connection_sock	dccps_inet_connection;
	__u64				dccps_swl;
	__u64				dccps_swh;
	__u64				dccps_awl;
	__u64				dccps_awh;
	__u64				dccps_iss;
	__u64				dccps_isr;
	__u64				dccps_osr;
	__u64				dccps_gss;
	__u64				dccps_gsr;
	__u64				dccps_gar;
	__u32				dccps_service;
	struct dccp_service_list	*dccps_service_list;
	struct timeval			dccps_timestamp_time;
	__u32				dccps_timestamp_echo;
	__u32				dccps_packet_size;
	unsigned long			dccps_ndp_count;
	__u16				dccps_ext_header_len;
	__u32				dccps_pmtu_cookie;
	__u32				dccps_mss_cache;
	struct dccp_options		dccps_options;
	struct dccp_ackvec		*dccps_hc_rx_ackvec;
	void				*dccps_hc_rx_ccid_private;
	void				*dccps_hc_tx_ccid_private;
	struct ccid			*dccps_hc_rx_ccid;
	struct ccid			*dccps_hc_tx_ccid;
	struct dccp_options_received	dccps_options_received;
	struct timeval			dccps_epoch;
	enum dccp_role			dccps_role:2;
	__u8				dccps_hc_rx_insert_options:1;
	__u8				dccps_hc_tx_insert_options:1;
};
 
static inline struct dccp_sock *dccp_sk(const struct sock *sk)
{
	return (struct dccp_sock *)sk;
}

static inline int dccp_service_not_initialized(const struct sock *sk)
{
	return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
}

static inline const char *dccp_role(const struct sock *sk)
{
	switch (dccp_sk(sk)->dccps_role) {
	case DCCP_ROLE_UNDEFINED: return "undefined";
	case DCCP_ROLE_LISTEN:	  return "listen";
	case DCCP_ROLE_SERVER:	  return "server";
	case DCCP_ROLE_CLIENT:	  return "client";
	}
	return NULL;
}

#endif /* __KERNEL__ */

#endif /* _LINUX_DCCP_H */
Commit	Line	Data
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 {
	21	__u16 dccph_sport,
	22	dccph_dport;
	23	__u8 dccph_doff;
	24	#if defined(__LITTLE_ENDIAN_BITFIELD)
	25	__u8 dccph_cscov:4,
	26	dccph_ccval:4;
	27	#elif defined(__BIG_ENDIAN_BITFIELD)
	28	__u8 dccph_ccval:4,
	29	dccph_cscov:4;
	30	#else
	31	#error "Adjust your <asm/byteorder.h> defines"
	32	#endif
	33	__u16 dccph_checksum;
	34	#if defined(__LITTLE_ENDIAN_BITFIELD)
	35	__u32 dccph_x:1,
	36	dccph_type:4,
	37	dccph_reserved:3,
	38	dccph_seq:24;
	39	#elif defined(__BIG_ENDIAN_BITFIELD)
	40	__u32 dccph_reserved:3,
	41	dccph_type:4,
	42	dccph_x:1,
	43	dccph_seq:24;
	44	#else
	45	#error "Adjust your <asm/byteorder.h> defines"
	46	#endif
	47	};
	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 {
	55	__u32 dccph_seq_low;
	56	};
	57
7c657876 ACM	58	/**
	59	* struct dccp_hdr_request - Conection initiation request header
	60	*
	61	* @dccph_req_service - Service to which the client app wants to connect
	62	* @dccph_req_options - list of options (must be a multiple of 32 bits
	63	*/
	64	struct dccp_hdr_request {
	65	__u32 dccph_req_service;
	66	};
7c657876 ACM	67	/**
	68	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	69	*
	70	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	71	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	72	*/
	73	struct dccp_hdr_ack_bits {
	74	__u32 dccph_reserved1:8,
	75	dccph_ack_nr_high:24;
	76	__u32 dccph_ack_nr_low;
	77	};
7c657876 ACM	78	/**
	79	* struct dccp_hdr_response - Conection initiation response header
	80	*
	81	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	82	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	83	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
	84	* @dccph_resp_options - list of options (must be a multiple of 32 bits
	85	*/
	86	struct dccp_hdr_response {
	87	struct dccp_hdr_ack_bits dccph_resp_ack;
	88	__u32 dccph_resp_service;
	89	};
	90
7c657876 ACM	91	/**
	92	* struct dccp_hdr_reset - Unconditionally shut down a connection
	93	*
	94	* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
	95	* @dccph_reset_options - list of options (must be a multiple of 32 bits
	96	*/
	97	struct dccp_hdr_reset {
	98	struct dccp_hdr_ack_bits dccph_reset_ack;
	99	__u8 dccph_reset_code,
	100	dccph_reset_data[3];
	101	};
	102
7c657876 ACM	103	enum dccp_pkt_type {
	104	DCCP_PKT_REQUEST = 0,
	105	DCCP_PKT_RESPONSE,
	106	DCCP_PKT_DATA,
	107	DCCP_PKT_ACK,
	108	DCCP_PKT_DATAACK,
	109	DCCP_PKT_CLOSEREQ,
	110	DCCP_PKT_CLOSE,
	111	DCCP_PKT_RESET,
	112	DCCP_PKT_SYNC,
	113	DCCP_PKT_SYNCACK,
	114	DCCP_PKT_INVALID,
	115	};
	116
	117	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
	118
	119	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	120	{
	121	if (type == DCCP_PKT_DATA)
	122	return 0;
	123	if (type == DCCP_PKT_DATAACK \|\|
	124	type == DCCP_PKT_ACK \|\|
	125	type == DCCP_PKT_SYNC \|\|
	126	type == DCCP_PKT_SYNCACK \|\|
	127	type == DCCP_PKT_CLOSE \|\|
	128	type == DCCP_PKT_CLOSEREQ)
	129	return sizeof(struct dccp_hdr_ack_bits);
	130	if (type == DCCP_PKT_REQUEST)
	131	return sizeof(struct dccp_hdr_request);
	132	if (type == DCCP_PKT_RESPONSE)
	133	return sizeof(struct dccp_hdr_response);
	134	return sizeof(struct dccp_hdr_reset);
	135	}
7c657876 ACM	136	enum dccp_reset_codes {
	137	DCCP_RESET_CODE_UNSPECIFIED = 0,
	138	DCCP_RESET_CODE_CLOSED,
	139	DCCP_RESET_CODE_ABORTED,
	140	DCCP_RESET_CODE_NO_CONNECTION,
	141	DCCP_RESET_CODE_PACKET_ERROR,
	142	DCCP_RESET_CODE_OPTION_ERROR,
	143	DCCP_RESET_CODE_MANDATORY_ERROR,
	144	DCCP_RESET_CODE_CONNECTION_REFUSED,
	145	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	146	DCCP_RESET_CODE_TOO_BUSY,
	147	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	148	DCCP_RESET_CODE_AGGRESSION_PENALTY,
	149	};
	150
	151	/* DCCP options */
	152	enum {
	153	DCCPO_PADDING = 0,
	154	DCCPO_MANDATORY = 1,
	155	DCCPO_MIN_RESERVED = 3,
	156	DCCPO_MAX_RESERVED = 31,
	157	DCCPO_NDP_COUNT = 37,
	158	DCCPO_ACK_VECTOR_0 = 38,
	159	DCCPO_ACK_VECTOR_1 = 39,
	160	DCCPO_TIMESTAMP = 41,
	161	DCCPO_TIMESTAMP_ECHO = 42,
	162	DCCPO_ELAPSED_TIME = 43,
	163	DCCPO_MAX = 45,
	164	DCCPO_MIN_CCID_SPECIFIC = 128,
	165	DCCPO_MAX_CCID_SPECIFIC = 255,
	166	};
	167
	168	/* DCCP features */
	169	enum {
	170	DCCPF_RESERVED = 0,
	171	DCCPF_SEQUENCE_WINDOW = 3,
	172	DCCPF_SEND_ACK_VECTOR = 6,
	173	DCCPF_SEND_NDP_COUNT = 7,
	174	/* 10-127 reserved */
	175	DCCPF_MIN_CCID_SPECIFIC = 128,
	176	DCCPF_MAX_CCID_SPECIFIC = 255,
	177	};
	178
a84ffe43 ACM	179	/* DCCP socket options */
a84ffe43 ACM	180	#define DCCP_SOCKOPT_PACKET_SIZE 1
67e6b629 ACM	181	#define DCCP_SOCKOPT_SERVICE 2
	182
	183	#define DCCP_SERVICE_LIST_MAX_LEN 32
a84ffe43	184
5a47a470 HW	185	#ifdef __KERNEL__
	186
	187	#include <linux/in.h>
	188	#include <linux/list.h>
	189	#include <linux/uio.h>
	190	#include <linux/workqueue.h>
	191
	192	#include <net/inet_connection_sock.h>
64cf1e5d	193	#include <net/inet_timewait_sock.h>
5a47a470 HW	194	#include <net/sock.h>
	195	#include <net/tcp_states.h>
	196	#include <net/tcp.h>
	197
	198	enum dccp_state {
	199	DCCP_OPEN = TCP_ESTABLISHED,
	200	DCCP_REQUESTING = TCP_SYN_SENT,
	201	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	202	This mapping is horrible, but TCP has
	203	no matching state for DCCP_PARTOPEN,
	204	as TCP_SYN_RECV is already used by
	205	DCCP_RESPOND, why don't stop using TCP
	206	mapping of states? OK, now we don't use
	207	sk_stream_sendmsg anymore, so doesn't
	208	seem to exist any reason for us to
	209	do the TCP mapping here */
	210	DCCP_LISTEN = TCP_LISTEN,
	211	DCCP_RESPOND = TCP_SYN_RECV,
	212	DCCP_CLOSING = TCP_CLOSING,
	213	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	214	DCCP_CLOSED = TCP_CLOSE,
	215	DCCP_MAX_STATES = TCP_MAX_STATES,
	216	};
	217
	218	#define DCCP_STATE_MASK 0xf
	219	#define DCCP_ACTION_FIN (1<<7)
	220
	221	enum {
	222	DCCPF_OPEN = TCPF_ESTABLISHED,
	223	DCCPF_REQUESTING = TCPF_SYN_SENT,
	224	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	225	DCCPF_LISTEN = TCPF_LISTEN,
	226	DCCPF_RESPOND = TCPF_SYN_RECV,
	227	DCCPF_CLOSING = TCPF_CLOSING,
	228	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	229	DCCPF_CLOSED = TCPF_CLOSE,
	230	};
	231
	232	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	233	{
	234	return (struct dccp_hdr *)skb->h.raw;
	235	}
	236
	237	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
	238	{
	239	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
	240	}
	241
1d3de414 HW	242	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	243	{
	244	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	245	}
	246
5a47a470 HW	247	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	248	{
	249	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	250	return __dccp_basic_hdr_len(dh);
5a47a470 HW	251	}
	252
	253	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	254	{
	255	const struct dccp_hdr *dh = dccp_hdr(skb);
	256	#if defined(__LITTLE_ENDIAN_BITFIELD)
	257	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
	258	#elif defined(__BIG_ENDIAN_BITFIELD)
	259	__u64 seq_nr = ntohl(dh->dccph_seq);
	260	#else
	261	#error "Adjust your <asm/byteorder.h> defines"
	262	#endif
	263
	264	if (dh->dccph_x != 0)
	265	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
	266
	267	return seq_nr;
	268	}
	269
	270	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	271	{
	272	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
	273	}
	274
	275	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	276	{
	277	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
	278	}
	279
	280	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	281	{
	282	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	283	#if defined(__LITTLE_ENDIAN_BITFIELD)
	284	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	285	#elif defined(__BIG_ENDIAN_BITFIELD)
	286	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	287	#else
	288	#error "Adjust your <asm/byteorder.h> defines"
	289	#endif
	290	}
	291
	292	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	293	{
	294	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
	295	}
	296
	297	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	298	{
	299	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
	300	}
	301
1d3de414 HW	302	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	303	{
	304	return __dccp_basic_hdr_len(dh) +
	305	dccp_packet_hdr_len(dh->dccph_type);
	306	}
	307
5a47a470 HW	308	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	309	{
1d3de414	310	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	311	}
	312
	313
7c657876 ACM	314	/* initial values for each feature */
	315	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
	316	/* FIXME: for now we're using CCID 3 (TFRC) */
	317	#define DCCPF_INITIAL_CCID 3
	318	#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
	319	/* FIXME: for now we're default to 1 but it should really be 0 */
	320	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	321
	322	#define DCCP_NDP_LIMIT 0xFFFFFF
	323
	324	/**
	325	* struct dccp_options - option values for a DCCP connection
	326	* @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
	327	* @dccpo_ccid - Congestion Control Id (CCID) (section 10)
	328	* @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
	329	* @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
	330	*/
	331	struct dccp_options {
	332	__u64 dccpo_sequence_window;
561713cf ACM	333	__u8 dccpo_rx_ccid;
561713cf ACM	334	__u8 dccpo_tx_ccid;
7c657876 ACM	335	__u8 dccpo_send_ack_vector;
	336	__u8 dccpo_send_ndp_count;
	337	};
	338
	339	extern void __dccp_options_init(struct dccp_options *dccpo);
	340	extern void dccp_options_init(struct dccp_options *dccpo);
	341	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	342
	343	struct dccp_request_sock {
	344	struct inet_request_sock dreq_inet_rsk;
	345	__u64 dreq_iss;
	346	__u64 dreq_isr;
	347	__u32 dreq_service;
	348	};
	349
	350	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	351	{
	352	return (struct dccp_request_sock *)req;
	353	}
	354
64cf1e5d ACM	355	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	356
7c657876	357	struct dccp_options_received {
ae31c339	358	u32 dccpor_ndp; /* only 24 bits */
7c657876 ACM	359	u32 dccpor_timestamp;
	360	u32 dccpor_timestamp_echo;
	361	u32 dccpor_elapsed_time;
	362	};
	363
	364	struct ccid;
	365
	366	enum dccp_role {
	367	DCCP_ROLE_UNDEFINED,
	368	DCCP_ROLE_LISTEN,
	369	DCCP_ROLE_CLIENT,
	370	DCCP_ROLE_SERVER,
	371	};
	372
67e6b629 ACM	373	struct dccp_service_list {
	374	__u32 dccpsl_nr;
	375	__u32 dccpsl_list[0];
	376	};
	377
	378	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
	379
	380	static inline int dccp_list_has_service(const struct dccp_service_list *sl,
	381	const u32 service)
	382	{
	383	if (likely(sl != NULL)) {
	384	u32 i = sl->dccpsl_nr;
	385	while (i--)
	386	if (sl->dccpsl_list[i] == service)
	387	return 1;
	388	}
	389	return 0;
	390	}
	391
ae31c339 ACM	392	struct dccp_ackvec;
ae31c339 ACM	393
7c657876 ACM	394	/**
	395	* struct dccp_sock - DCCP socket state
	396	*
	397	* @dccps_swl - sequence number window low
	398	* @dccps_swh - sequence number window high
	399	* @dccps_awl - acknowledgement number window low
	400	* @dccps_awh - acknowledgement number window high
	401	* @dccps_iss - initial sequence number sent
	402	* @dccps_isr - initial sequence number received
	403	* @dccps_osr - first OPEN sequence number received
	404	* @dccps_gss - greatest sequence number sent
	405	* @dccps_gsr - greatest valid sequence number received
	406	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
	407	* @dccps_timestamp_time - time of latest TIMESTAMP option
	408	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
	409	* @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
	410	* @dccps_pmtu_cookie - Last pmtu seen by socket
a84ffe43	411	* @dccps_packet_size - Set thru setsockopt
7c657876 ACM	412	* @dccps_role - Role of this sock, one of %dccp_role
7c657876 ACM	413	* @dccps_ndp_count - number of Non Data Packets since last data packet
ae31c339	414	* @dccps_hc_rx_ackvec - rx half connection ack vector
7c657876 ACM	415	*/
	416	struct dccp_sock {
	417	/* inet_connection_sock has to be the first member of dccp_sock */
	418	struct inet_connection_sock dccps_inet_connection;
	419	__u64 dccps_swl;
	420	__u64 dccps_swh;
	421	__u64 dccps_awl;
	422	__u64 dccps_awh;
	423	__u64 dccps_iss;
	424	__u64 dccps_isr;
	425	__u64 dccps_osr;
	426	__u64 dccps_gss;
	427	__u64 dccps_gsr;
	428	__u64 dccps_gar;
67e6b629 ACM	429	__u32 dccps_service;
67e6b629 ACM	430	struct dccp_service_list *dccps_service_list;
1bc09869	431	struct timeval dccps_timestamp_time;
7c657876	432	__u32 dccps_timestamp_echo;
a84ffe43	433	__u32 dccps_packet_size;
7c657876 ACM	434	unsigned long dccps_ndp_count;
	435	__u16 dccps_ext_header_len;
	436	__u32 dccps_pmtu_cookie;
	437	__u32 dccps_mss_cache;
	438	struct dccp_options dccps_options;
ae31c339	439	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	440	void *dccps_hc_rx_ccid_private;
	441	void *dccps_hc_tx_ccid_private;
	442	struct ccid *dccps_hc_rx_ccid;
	443	struct ccid *dccps_hc_tx_ccid;
	444	struct dccp_options_received dccps_options_received;
b0e56780	445	struct timeval dccps_epoch;
7c657876	446	enum dccp_role dccps_role:2;
507d37cf ACM	447	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	448	__u8 dccps_hc_tx_insert_options:1;
7c657876 ACM	449	};
	450
	451	static inline struct dccp_sock dccp_sk(const struct sock sk)
	452	{
	453	return (struct dccp_sock *)sk;
	454	}
	455
67e6b629 ACM	456	static inline int dccp_service_not_initialized(const struct sock *sk)
	457	{
	458	return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
	459	}
	460
7c657876 ACM	461	static inline const char dccp_role(const struct sock sk)
	462	{
	463	switch (dccp_sk(sk)->dccps_role) {
	464	case DCCP_ROLE_UNDEFINED: return "undefined";
	465	case DCCP_ROLE_LISTEN: return "listen";
	466	case DCCP_ROLE_SERVER: return "server";
	467	case DCCP_ROLE_CLIENT: return "client";
	468	}
	469	return NULL;
	470	}
	471
5a47a470 HW	472	#endif /* __KERNEL__ */
5a47a470 HW	473
7c657876	474	#endif /* _LINUX_DCCP_H */