diff options
Diffstat (limited to 'include/uapi/linux/dccp.h')
| -rw-r--r-- | include/uapi/linux/dccp.h | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/include/uapi/linux/dccp.h b/include/uapi/linux/dccp.h new file mode 100644 index 000000000..6e1978dbc --- /dev/null +++ b/include/uapi/linux/dccp.h @@ -0,0 +1,238 @@ +/* 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 { + __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 /* _UAPI_LINUX_DCCP_H */ |