239 lines
6.3 KiB
C
239 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_DCCP_H
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#define _UAPI_LINUX_DCCP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/**
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* struct dccp_hdr - generic part of DCCP packet header
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*
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* @dccph_sport - Relevant port on the endpoint that sent this packet
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* @dccph_dport - Relevant port on the other endpoint
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* @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
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* @dccph_ccval - Used by the HC-Sender CCID
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* @dccph_cscov - Parts of the packet that are covered by the Checksum field
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* @dccph_checksum - Internet checksum, depends on dccph_cscov
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* @dccph_x - 0 = 24 bit sequence number, 1 = 48
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* @dccph_type - packet type, see DCCP_PKT_ prefixed macros
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* @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
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*/
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struct dccp_hdr {
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__be16 dccph_sport,
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dccph_dport;
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__u8 dccph_doff;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 dccph_cscov:4,
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dccph_ccval:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 dccph_ccval:4,
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dccph_cscov:4;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__sum16 dccph_checksum;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 dccph_x:1,
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dccph_type:4,
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dccph_reserved:3;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 dccph_reserved:3,
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dccph_type:4,
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dccph_x:1;
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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__u8 dccph_seq2;
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__be16 dccph_seq;
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};
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/**
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* struct dccp_hdr_ext - the low bits of a 48 bit seq packet
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*
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* @dccph_seq_low - low 24 bits of a 48 bit seq packet
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*/
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struct dccp_hdr_ext {
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__be32 dccph_seq_low;
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};
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/**
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* struct dccp_hdr_request - Connection initiation request header
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*
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* @dccph_req_service - Service to which the client app wants to connect
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*/
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struct dccp_hdr_request {
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__be32 dccph_req_service;
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};
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/**
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* struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
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*
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* @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
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* @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
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*/
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struct dccp_hdr_ack_bits {
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__be16 dccph_reserved1;
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__be16 dccph_ack_nr_high;
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__be32 dccph_ack_nr_low;
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};
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/**
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* struct dccp_hdr_response - Connection initiation response header
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*
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* @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
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* @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
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*/
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struct dccp_hdr_response {
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struct dccp_hdr_ack_bits dccph_resp_ack;
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__be32 dccph_resp_service;
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};
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/**
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* struct dccp_hdr_reset - Unconditionally shut down a connection
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*
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* @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6)
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* @dccph_reset_code - one of %dccp_reset_codes
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* @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
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*/
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struct dccp_hdr_reset {
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struct dccp_hdr_ack_bits dccph_reset_ack;
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__u8 dccph_reset_code,
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dccph_reset_data[3];
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};
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enum dccp_pkt_type {
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DCCP_PKT_REQUEST = 0,
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DCCP_PKT_RESPONSE,
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DCCP_PKT_DATA,
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DCCP_PKT_ACK,
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DCCP_PKT_DATAACK,
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DCCP_PKT_CLOSEREQ,
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DCCP_PKT_CLOSE,
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DCCP_PKT_RESET,
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DCCP_PKT_SYNC,
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DCCP_PKT_SYNCACK,
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DCCP_PKT_INVALID,
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};
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#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
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static inline unsigned int dccp_packet_hdr_len(const __u8 type)
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{
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if (type == DCCP_PKT_DATA)
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return 0;
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if (type == DCCP_PKT_DATAACK ||
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type == DCCP_PKT_ACK ||
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type == DCCP_PKT_SYNC ||
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type == DCCP_PKT_SYNCACK ||
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type == DCCP_PKT_CLOSE ||
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type == DCCP_PKT_CLOSEREQ)
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return sizeof(struct dccp_hdr_ack_bits);
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if (type == DCCP_PKT_REQUEST)
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return sizeof(struct dccp_hdr_request);
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if (type == DCCP_PKT_RESPONSE)
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return sizeof(struct dccp_hdr_response);
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return sizeof(struct dccp_hdr_reset);
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}
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enum dccp_reset_codes {
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DCCP_RESET_CODE_UNSPECIFIED = 0,
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DCCP_RESET_CODE_CLOSED,
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DCCP_RESET_CODE_ABORTED,
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DCCP_RESET_CODE_NO_CONNECTION,
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DCCP_RESET_CODE_PACKET_ERROR,
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DCCP_RESET_CODE_OPTION_ERROR,
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DCCP_RESET_CODE_MANDATORY_ERROR,
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DCCP_RESET_CODE_CONNECTION_REFUSED,
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DCCP_RESET_CODE_BAD_SERVICE_CODE,
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DCCP_RESET_CODE_TOO_BUSY,
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DCCP_RESET_CODE_BAD_INIT_COOKIE,
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DCCP_RESET_CODE_AGGRESSION_PENALTY,
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DCCP_MAX_RESET_CODES /* Leave at the end! */
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};
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/* DCCP options */
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enum {
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DCCPO_PADDING = 0,
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DCCPO_MANDATORY = 1,
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DCCPO_MIN_RESERVED = 3,
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DCCPO_MAX_RESERVED = 31,
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DCCPO_CHANGE_L = 32,
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DCCPO_CONFIRM_L = 33,
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DCCPO_CHANGE_R = 34,
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DCCPO_CONFIRM_R = 35,
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DCCPO_NDP_COUNT = 37,
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DCCPO_ACK_VECTOR_0 = 38,
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DCCPO_ACK_VECTOR_1 = 39,
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DCCPO_TIMESTAMP = 41,
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DCCPO_TIMESTAMP_ECHO = 42,
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DCCPO_ELAPSED_TIME = 43,
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DCCPO_MAX = 45,
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DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */
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DCCPO_MAX_RX_CCID_SPECIFIC = 191,
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DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */
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DCCPO_MAX_TX_CCID_SPECIFIC = 255,
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};
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/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
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#define DCCP_SINGLE_OPT_MAXLEN 253
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/* DCCP CCIDS */
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enum {
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DCCPC_CCID2 = 2,
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DCCPC_CCID3 = 3,
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};
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/* DCCP features (RFC 4340 section 6.4) */
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enum dccp_feature_numbers {
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DCCPF_RESERVED = 0,
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DCCPF_CCID = 1,
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DCCPF_SHORT_SEQNOS = 2,
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DCCPF_SEQUENCE_WINDOW = 3,
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DCCPF_ECN_INCAPABLE = 4,
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DCCPF_ACK_RATIO = 5,
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DCCPF_SEND_ACK_VECTOR = 6,
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DCCPF_SEND_NDP_COUNT = 7,
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DCCPF_MIN_CSUM_COVER = 8,
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DCCPF_DATA_CHECKSUM = 9,
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/* 10-127 reserved */
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DCCPF_MIN_CCID_SPECIFIC = 128,
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DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
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DCCPF_MAX_CCID_SPECIFIC = 255,
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};
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/* DCCP socket control message types for cmsg */
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enum dccp_cmsg_type {
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DCCP_SCM_PRIORITY = 1,
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DCCP_SCM_QPOLICY_MAX = 0xFFFF,
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/* ^-- Up to here reserved exclusively for qpolicy parameters */
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DCCP_SCM_MAX
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};
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/* DCCP priorities for outgoing/queued packets */
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enum dccp_packet_dequeueing_policy {
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DCCPQ_POLICY_SIMPLE,
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DCCPQ_POLICY_PRIO,
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DCCPQ_POLICY_MAX
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};
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/* DCCP socket options */
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#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
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#define DCCP_SOCKOPT_SERVICE 2
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#define DCCP_SOCKOPT_CHANGE_L 3
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#define DCCP_SOCKOPT_CHANGE_R 4
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#define DCCP_SOCKOPT_GET_CUR_MPS 5
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#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
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#define DCCP_SOCKOPT_SEND_CSCOV 10
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#define DCCP_SOCKOPT_RECV_CSCOV 11
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#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
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#define DCCP_SOCKOPT_CCID 13
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#define DCCP_SOCKOPT_TX_CCID 14
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#define DCCP_SOCKOPT_RX_CCID 15
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#define DCCP_SOCKOPT_QPOLICY_ID 16
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#define DCCP_SOCKOPT_QPOLICY_TXQLEN 17
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#define DCCP_SOCKOPT_CCID_RX_INFO 128
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#define DCCP_SOCKOPT_CCID_TX_INFO 192
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/* maximum number of services provided on the same listening port */
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#define DCCP_SERVICE_LIST_MAX_LEN 32
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#endif /* _UAPI_LINUX_DCCP_H */
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