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238 lines
6.3 KiB
238 lines
6.3 KiB
/* 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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