| #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_CCID_SPECIFIC = 128, |
| DCCPO_MAX_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 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_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 */ |