You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
239 lines
6.3 KiB
C
239 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
#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_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 /* _LINUX_DCCP_H */
|