/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #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 { … }; /** * 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 { … }; /** * struct dccp_hdr_request - Connection initiation request header * * @dccph_req_service - Service to which the client app wants to connect */ struct dccp_hdr_request { … }; /** * 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 { … }; /** * 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_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 { … }; enum dccp_pkt_type { … }; #define DCCP_NR_PKT_TYPES … static inline unsigned int dccp_packet_hdr_len(const __u8 type) { … } enum dccp_reset_codes { … }; /* DCCP options */ enum { … }; /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */ #define DCCP_SINGLE_OPT_MAXLEN … /* DCCP CCIDS */ enum { … }; /* DCCP features (RFC 4340 section 6.4) */ enum dccp_feature_numbers { … }; /* DCCP socket control message types for cmsg */ enum dccp_cmsg_type { … }; /* DCCP priorities for outgoing/queued packets */ enum dccp_packet_dequeueing_policy { … }; /* DCCP socket options */ #define DCCP_SOCKOPT_PACKET_SIZE … #define DCCP_SOCKOPT_SERVICE … #define DCCP_SOCKOPT_CHANGE_L … #define DCCP_SOCKOPT_CHANGE_R … #define DCCP_SOCKOPT_GET_CUR_MPS … #define DCCP_SOCKOPT_SERVER_TIMEWAIT … #define DCCP_SOCKOPT_SEND_CSCOV … #define DCCP_SOCKOPT_RECV_CSCOV … #define DCCP_SOCKOPT_AVAILABLE_CCIDS … #define DCCP_SOCKOPT_CCID … #define DCCP_SOCKOPT_TX_CCID … #define DCCP_SOCKOPT_RX_CCID … #define DCCP_SOCKOPT_QPOLICY_ID … #define DCCP_SOCKOPT_QPOLICY_TXQLEN … #define DCCP_SOCKOPT_CCID_RX_INFO … #define DCCP_SOCKOPT_CCID_TX_INFO … /* maximum number of services provided on the same listening port */ #define DCCP_SERVICE_LIST_MAX_LEN … #endif /* _UAPI_LINUX_DCCP_H */
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