include/uapi/linux/dccp.h

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This source file includes following definitions.
dccp_packet_hdr_len
#ifndef _UAPI_LINUX_DCCP_H
#define _UAPI_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_RX_CCID_SPECIFIC = 128,       /* from sender to receiver */
        DCCPO_MAX_RX_CCID_SPECIFIC = 191,
        DCCPO_MIN_TX_CCID_SPECIFIC = 192,       /* from receiver to sender */
        DCCPO_MAX_TX_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 control message types for cmsg */
enum dccp_cmsg_type {
        DCCP_SCM_PRIORITY = 1,
        DCCP_SCM_QPOLICY_MAX = 0xFFFF,
        /* ^-- Up to here reserved exclusively for qpolicy parameters */
        DCCP_SCM_MAX
};

/* DCCP priorities for outgoing/queued packets */
enum dccp_packet_dequeueing_policy {
        DCCPQ_POLICY_SIMPLE,
        DCCPQ_POLICY_PRIO,
        DCCPQ_POLICY_MAX
};

/* 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_QPOLICY_ID         16
#define DCCP_SOCKOPT_QPOLICY_TXQLEN     17
#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


#endif /* _UAPI_LINUX_DCCP_H */
/* [<][>][^][v][top][bottom][index][help] */
root/include/uapi/linux/dccp.h

INCLUDED FROM

DEFINITIONS
