dccp.h

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#ifndef _UAPI_LINUX_DCCP_H
#define _UAPI_LINUX_DCCP_H

#include <linux/types.h>
#include <asm/byteorder.h>

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 {
    __be32  dccph_seq_low;
};

struct dccp_hdr_request {
    __be32  dccph_req_service;
};
struct dccp_hdr_ack_bits {
    __be16  dccph_reserved1;
    __be16  dccph_ack_nr_high;
    __be32  dccph_ack_nr_low;
};
struct dccp_hdr_response {
    struct dccp_hdr_ack_bits    dccph_resp_ack;
    __be32              dccph_resp_service;
};

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 */