[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>

/* Structure describing an Internet (DCCP) socket address. */
struct sockaddr_dccp {
	__u16	sdccp_family;	/* Address family   */
	__u16	sdccp_port;	/* Port number	    */
	__u32	sdccp_addr;	/* Internet address */
	__u32	sdccp_service;	/* Service	    */
	/* Pad to size of `struct sockaddr': 16 bytes . */
	__u32	sdccp_pad;
};

/**
 * 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

#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_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;

/* Read about the ECN nonce to see why it is 253 */
#define DCCP_MAX_ACK_VECTOR_LEN 253

struct dccp_options_received {
	u32	dccpor_ndp:24,
		dccpor_ack_vector_len:8;
	u32	dccpor_ack_vector_idx:10;
	/* 22 bits hole, try to pack */
	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_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_ackpkts - receiver half connection acked packets
 */
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;
	unsigned long			dccps_service;
	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_ackpkts		*dccps_hc_rx_ackpkts;
	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 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
e2e26866	7	/* Structure describing an Internet (DCCP) socket address. */
7c657876	8	struct sockaddr_dccp {
e2e26866 ACM	9	__u16 sdccp_family; /* Address family */
	10	__u16 sdccp_port; /* Port number */
	11	__u32 sdccp_addr; /* Internet address */
	12	__u32 sdccp_service; /* Service */
	13	/* Pad to size of `struct sockaddr': 16 bytes . */
	14	__u32 sdccp_pad;
7c657876 ACM	15	};
7c657876 ACM	16
7c657876 ACM	17	/**
	18	* struct dccp_hdr - generic part of DCCP packet header
	19	*
	20	* @dccph_sport - Relevant port on the endpoint that sent this packet
	21	* @dccph_dport - Relevant port on the other endpoint
	22	* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
	23	* @dccph_ccval - Used by the HC-Sender CCID
	24	* @dccph_cscov - Parts of the packet that are covered by the Checksum field
	25	* @dccph_checksum - Internet checksum, depends on dccph_cscov
	26	* @dccph_x - 0 = 24 bit sequence number, 1 = 48
	27	* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
	28	* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
	29	*/
	30	struct dccp_hdr {
	31	__u16 dccph_sport,
	32	dccph_dport;
	33	__u8 dccph_doff;
	34	#if defined(__LITTLE_ENDIAN_BITFIELD)
	35	__u8 dccph_cscov:4,
	36	dccph_ccval:4;
	37	#elif defined(__BIG_ENDIAN_BITFIELD)
	38	__u8 dccph_ccval:4,
	39	dccph_cscov:4;
	40	#else
	41	#error "Adjust your <asm/byteorder.h> defines"
	42	#endif
	43	__u16 dccph_checksum;
	44	#if defined(__LITTLE_ENDIAN_BITFIELD)
	45	__u32 dccph_x:1,
	46	dccph_type:4,
	47	dccph_reserved:3,
	48	dccph_seq:24;
	49	#elif defined(__BIG_ENDIAN_BITFIELD)
	50	__u32 dccph_reserved:3,
	51	dccph_type:4,
	52	dccph_x:1,
	53	dccph_seq:24;
	54	#else
	55	#error "Adjust your <asm/byteorder.h> defines"
	56	#endif
	57	};
	58
7c657876 ACM	59	/**
	60	* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
	61	*
	62	* @dccph_seq_low - low 24 bits of a 48 bit seq packet
	63	*/
	64	struct dccp_hdr_ext {
	65	__u32 dccph_seq_low;
	66	};
	67
7c657876 ACM	68	/**
	69	* struct dccp_hdr_request - Conection initiation request header
	70	*
	71	* @dccph_req_service - Service to which the client app wants to connect
	72	* @dccph_req_options - list of options (must be a multiple of 32 bits
	73	*/
	74	struct dccp_hdr_request {
	75	__u32 dccph_req_service;
	76	};
7c657876 ACM	77	/**
	78	* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
	79	*
	80	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	81	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	82	*/
	83	struct dccp_hdr_ack_bits {
	84	__u32 dccph_reserved1:8,
	85	dccph_ack_nr_high:24;
	86	__u32 dccph_ack_nr_low;
	87	};
7c657876 ACM	88	/**
	89	* struct dccp_hdr_response - Conection initiation response header
	90	*
	91	* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
	92	* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
	93	* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
	94	* @dccph_resp_options - list of options (must be a multiple of 32 bits
	95	*/
	96	struct dccp_hdr_response {
	97	struct dccp_hdr_ack_bits dccph_resp_ack;
	98	__u32 dccph_resp_service;
	99	};
	100
7c657876 ACM	101	/**
	102	* struct dccp_hdr_reset - Unconditionally shut down a connection
	103	*
	104	* @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
	105	* @dccph_reset_options - list of options (must be a multiple of 32 bits
	106	*/
	107	struct dccp_hdr_reset {
	108	struct dccp_hdr_ack_bits dccph_reset_ack;
	109	__u8 dccph_reset_code,
	110	dccph_reset_data[3];
	111	};
	112
7c657876 ACM	113	enum dccp_pkt_type {
	114	DCCP_PKT_REQUEST = 0,
	115	DCCP_PKT_RESPONSE,
	116	DCCP_PKT_DATA,
	117	DCCP_PKT_ACK,
	118	DCCP_PKT_DATAACK,
	119	DCCP_PKT_CLOSEREQ,
	120	DCCP_PKT_CLOSE,
	121	DCCP_PKT_RESET,
	122	DCCP_PKT_SYNC,
	123	DCCP_PKT_SYNCACK,
	124	DCCP_PKT_INVALID,
	125	};
	126
	127	#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
	128
	129	static inline unsigned int dccp_packet_hdr_len(const __u8 type)
	130	{
	131	if (type == DCCP_PKT_DATA)
	132	return 0;
	133	if (type == DCCP_PKT_DATAACK \|\|
	134	type == DCCP_PKT_ACK \|\|
	135	type == DCCP_PKT_SYNC \|\|
	136	type == DCCP_PKT_SYNCACK \|\|
	137	type == DCCP_PKT_CLOSE \|\|
	138	type == DCCP_PKT_CLOSEREQ)
	139	return sizeof(struct dccp_hdr_ack_bits);
	140	if (type == DCCP_PKT_REQUEST)
	141	return sizeof(struct dccp_hdr_request);
	142	if (type == DCCP_PKT_RESPONSE)
	143	return sizeof(struct dccp_hdr_response);
	144	return sizeof(struct dccp_hdr_reset);
	145	}
7c657876 ACM	146	enum dccp_reset_codes {
	147	DCCP_RESET_CODE_UNSPECIFIED = 0,
	148	DCCP_RESET_CODE_CLOSED,
	149	DCCP_RESET_CODE_ABORTED,
	150	DCCP_RESET_CODE_NO_CONNECTION,
	151	DCCP_RESET_CODE_PACKET_ERROR,
	152	DCCP_RESET_CODE_OPTION_ERROR,
	153	DCCP_RESET_CODE_MANDATORY_ERROR,
	154	DCCP_RESET_CODE_CONNECTION_REFUSED,
	155	DCCP_RESET_CODE_BAD_SERVICE_CODE,
	156	DCCP_RESET_CODE_TOO_BUSY,
	157	DCCP_RESET_CODE_BAD_INIT_COOKIE,
	158	DCCP_RESET_CODE_AGGRESSION_PENALTY,
	159	};
	160
	161	/* DCCP options */
	162	enum {
	163	DCCPO_PADDING = 0,
	164	DCCPO_MANDATORY = 1,
	165	DCCPO_MIN_RESERVED = 3,
	166	DCCPO_MAX_RESERVED = 31,
	167	DCCPO_NDP_COUNT = 37,
	168	DCCPO_ACK_VECTOR_0 = 38,
	169	DCCPO_ACK_VECTOR_1 = 39,
	170	DCCPO_TIMESTAMP = 41,
	171	DCCPO_TIMESTAMP_ECHO = 42,
	172	DCCPO_ELAPSED_TIME = 43,
	173	DCCPO_MAX = 45,
	174	DCCPO_MIN_CCID_SPECIFIC = 128,
	175	DCCPO_MAX_CCID_SPECIFIC = 255,
	176	};
	177
	178	/* DCCP features */
	179	enum {
	180	DCCPF_RESERVED = 0,
	181	DCCPF_SEQUENCE_WINDOW = 3,
	182	DCCPF_SEND_ACK_VECTOR = 6,
	183	DCCPF_SEND_NDP_COUNT = 7,
	184	/* 10-127 reserved */
	185	DCCPF_MIN_CCID_SPECIFIC = 128,
	186	DCCPF_MAX_CCID_SPECIFIC = 255,
	187	};
	188
a84ffe43 ACM	189	/* DCCP socket options */
	190	#define DCCP_SOCKOPT_PACKET_SIZE 1
	191
5a47a470 HW	192	#ifdef __KERNEL__
	193
	194	#include <linux/in.h>
	195	#include <linux/list.h>
	196	#include <linux/uio.h>
	197	#include <linux/workqueue.h>
	198
	199	#include <net/inet_connection_sock.h>
64cf1e5d	200	#include <net/inet_timewait_sock.h>
5a47a470 HW	201	#include <net/sock.h>
	202	#include <net/tcp_states.h>
	203	#include <net/tcp.h>
	204
	205	enum dccp_state {
	206	DCCP_OPEN = TCP_ESTABLISHED,
	207	DCCP_REQUESTING = TCP_SYN_SENT,
	208	DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
	209	This mapping is horrible, but TCP has
	210	no matching state for DCCP_PARTOPEN,
	211	as TCP_SYN_RECV is already used by
	212	DCCP_RESPOND, why don't stop using TCP
	213	mapping of states? OK, now we don't use
	214	sk_stream_sendmsg anymore, so doesn't
	215	seem to exist any reason for us to
	216	do the TCP mapping here */
	217	DCCP_LISTEN = TCP_LISTEN,
	218	DCCP_RESPOND = TCP_SYN_RECV,
	219	DCCP_CLOSING = TCP_CLOSING,
	220	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	221	DCCP_CLOSED = TCP_CLOSE,
	222	DCCP_MAX_STATES = TCP_MAX_STATES,
	223	};
	224
	225	#define DCCP_STATE_MASK 0xf
	226	#define DCCP_ACTION_FIN (1<<7)
	227
	228	enum {
	229	DCCPF_OPEN = TCPF_ESTABLISHED,
	230	DCCPF_REQUESTING = TCPF_SYN_SENT,
	231	DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
	232	DCCPF_LISTEN = TCPF_LISTEN,
	233	DCCPF_RESPOND = TCPF_SYN_RECV,
	234	DCCPF_CLOSING = TCPF_CLOSING,
	235	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	236	DCCPF_CLOSED = TCPF_CLOSE,
	237	};
	238
	239	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	240	{
	241	return (struct dccp_hdr *)skb->h.raw;
	242	}
	243
	244	static inline struct dccp_hdr_ext dccp_hdrx(const struct sk_buff skb)
	245	{
	246	return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
	247	}
	248
1d3de414 HW	249	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	250	{
	251	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	252	}
	253
5a47a470 HW	254	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	255	{
	256	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	257	return __dccp_basic_hdr_len(dh);
5a47a470 HW	258	}
	259
	260	static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
	261	{
	262	const struct dccp_hdr *dh = dccp_hdr(skb);
	263	#if defined(__LITTLE_ENDIAN_BITFIELD)
	264	__u64 seq_nr = ntohl(dh->dccph_seq << 8);
	265	#elif defined(__BIG_ENDIAN_BITFIELD)
	266	__u64 seq_nr = ntohl(dh->dccph_seq);
	267	#else
	268	#error "Adjust your <asm/byteorder.h> defines"
	269	#endif
	270
	271	if (dh->dccph_x != 0)
	272	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
	273
	274	return seq_nr;
	275	}
	276
	277	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	278	{
	279	return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
	280	}
	281
	282	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	283	{
	284	return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
	285	}
	286
	287	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	288	{
	289	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	290	#if defined(__LITTLE_ENDIAN_BITFIELD)
	291	return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	292	#elif defined(__BIG_ENDIAN_BITFIELD)
	293	return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
	294	#else
	295	#error "Adjust your <asm/byteorder.h> defines"
	296	#endif
	297	}
	298
	299	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	300	{
	301	return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
	302	}
	303
	304	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	305	{
	306	return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
	307	}
	308
1d3de414 HW	309	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	310	{
	311	return __dccp_basic_hdr_len(dh) +
	312	dccp_packet_hdr_len(dh->dccph_type);
	313	}
	314
5a47a470 HW	315	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	316	{
1d3de414	317	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	318	}
	319
	320
7c657876 ACM	321	/* initial values for each feature */
	322	#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
	323	/* FIXME: for now we're using CCID 3 (TFRC) */
	324	#define DCCPF_INITIAL_CCID 3
	325	#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
	326	/* FIXME: for now we're default to 1 but it should really be 0 */
	327	#define DCCPF_INITIAL_SEND_NDP_COUNT 1
	328
	329	#define DCCP_NDP_LIMIT 0xFFFFFF
	330
	331	/**
	332	* struct dccp_options - option values for a DCCP connection
	333	* @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
	334	* @dccpo_ccid - Congestion Control Id (CCID) (section 10)
	335	* @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
	336	* @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
	337	*/
	338	struct dccp_options {
	339	__u64 dccpo_sequence_window;
	340	__u8 dccpo_ccid;
	341	__u8 dccpo_send_ack_vector;
	342	__u8 dccpo_send_ndp_count;
	343	};
	344
	345	extern void __dccp_options_init(struct dccp_options *dccpo);
	346	extern void dccp_options_init(struct dccp_options *dccpo);
	347	extern int dccp_parse_options(struct sock sk, struct sk_buff skb);
	348
	349	struct dccp_request_sock {
	350	struct inet_request_sock dreq_inet_rsk;
	351	__u64 dreq_iss;
	352	__u64 dreq_isr;
	353	__u32 dreq_service;
	354	};
	355
	356	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	357	{
	358	return (struct dccp_request_sock *)req;
	359	}
	360
64cf1e5d ACM	361	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	362
7c657876 ACM	363	/* Read about the ECN nonce to see why it is 253 */
	364	#define DCCP_MAX_ACK_VECTOR_LEN 253
	365
	366	struct dccp_options_received {
	367	u32 dccpor_ndp:24,
	368	dccpor_ack_vector_len:8;
	369	u32 dccpor_ack_vector_idx:10;
	370	/* 22 bits hole, try to pack */
	371	u32 dccpor_timestamp;
	372	u32 dccpor_timestamp_echo;
	373	u32 dccpor_elapsed_time;
	374	};
	375
	376	struct ccid;
	377
	378	enum dccp_role {
	379	DCCP_ROLE_UNDEFINED,
	380	DCCP_ROLE_LISTEN,
	381	DCCP_ROLE_CLIENT,
	382	DCCP_ROLE_SERVER,
	383	};
	384
	385	/**
	386	* struct dccp_sock - DCCP socket state
	387	*
	388	* @dccps_swl - sequence number window low
	389	* @dccps_swh - sequence number window high
	390	* @dccps_awl - acknowledgement number window low
	391	* @dccps_awh - acknowledgement number window high
	392	* @dccps_iss - initial sequence number sent
	393	* @dccps_isr - initial sequence number received
	394	* @dccps_osr - first OPEN sequence number received
	395	* @dccps_gss - greatest sequence number sent
	396	* @dccps_gsr - greatest valid sequence number received
	397	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
	398	* @dccps_timestamp_time - time of latest TIMESTAMP option
	399	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
	400	* @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
	401	* @dccps_pmtu_cookie - Last pmtu seen by socket
a84ffe43	402	* @dccps_packet_size - Set thru setsockopt
7c657876 ACM	403	* @dccps_role - Role of this sock, one of %dccp_role
	404	* @dccps_ndp_count - number of Non Data Packets since last data packet
	405	* @dccps_hc_rx_ackpkts - receiver half connection acked packets
	406	*/
	407	struct dccp_sock {
	408	/* inet_connection_sock has to be the first member of dccp_sock */
	409	struct inet_connection_sock dccps_inet_connection;
	410	__u64 dccps_swl;
	411	__u64 dccps_swh;
	412	__u64 dccps_awl;
	413	__u64 dccps_awh;
	414	__u64 dccps_iss;
	415	__u64 dccps_isr;
	416	__u64 dccps_osr;
	417	__u64 dccps_gss;
	418	__u64 dccps_gsr;
	419	__u64 dccps_gar;
	420	unsigned long dccps_service;
1bc09869	421	struct timeval dccps_timestamp_time;
7c657876	422	__u32 dccps_timestamp_echo;
a84ffe43	423	__u32 dccps_packet_size;
7c657876 ACM	424	unsigned long dccps_ndp_count;
	425	__u16 dccps_ext_header_len;
	426	__u32 dccps_pmtu_cookie;
	427	__u32 dccps_mss_cache;
	428	struct dccp_options dccps_options;
	429	struct dccp_ackpkts *dccps_hc_rx_ackpkts;
	430	void *dccps_hc_rx_ccid_private;
	431	void *dccps_hc_tx_ccid_private;
	432	struct ccid *dccps_hc_rx_ccid;
	433	struct ccid *dccps_hc_tx_ccid;
	434	struct dccp_options_received dccps_options_received;
b0e56780	435	struct timeval dccps_epoch;
7c657876	436	enum dccp_role dccps_role:2;
507d37cf ACM	437	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	438	__u8 dccps_hc_tx_insert_options:1;
7c657876 ACM	439	};
	440
	441	static inline struct dccp_sock dccp_sk(const struct sock sk)
	442	{
	443	return (struct dccp_sock *)sk;
	444	}
	445
	446	static inline const char dccp_role(const struct sock sk)
	447	{
	448	switch (dccp_sk(sk)->dccps_role) {
	449	case DCCP_ROLE_UNDEFINED: return "undefined";
	450	case DCCP_ROLE_LISTEN: return "listen";
	451	case DCCP_ROLE_SERVER: return "server";
	452	case DCCP_ROLE_CLIENT: return "client";
	453	}
	454	return NULL;
	455	}
	456
5a47a470 HW	457	#endif /* __KERNEL__ */
5a47a470 HW	458
7c657876	459	#endif /* _LINUX_DCCP_H */