1#ifndef _UAPI_LINUX_DCCP_H 2#define _UAPI_LINUX_DCCP_H 3 4#include <linux/types.h> 5#include <asm/byteorder.h> 6 7/** 8 * struct dccp_hdr - generic part of DCCP packet header 9 * 10 * @dccph_sport - Relevant port on the endpoint that sent this packet 11 * @dccph_dport - Relevant port on the other endpoint 12 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words 13 * @dccph_ccval - Used by the HC-Sender CCID 14 * @dccph_cscov - Parts of the packet that are covered by the Checksum field 15 * @dccph_checksum - Internet checksum, depends on dccph_cscov 16 * @dccph_x - 0 = 24 bit sequence number, 1 = 48 17 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros 18 * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x 19 */ 20struct dccp_hdr { 21 __be16 dccph_sport, 22 dccph_dport; 23 __u8 dccph_doff; 24#if defined(__LITTLE_ENDIAN_BITFIELD) 25 __u8 dccph_cscov:4, 26 dccph_ccval:4; 27#elif defined(__BIG_ENDIAN_BITFIELD) 28 __u8 dccph_ccval:4, 29 dccph_cscov:4; 30#else 31#error "Adjust your <asm/byteorder.h> defines" 32#endif 33 __sum16 dccph_checksum; 34#if defined(__LITTLE_ENDIAN_BITFIELD) 35 __u8 dccph_x:1, 36 dccph_type:4, 37 dccph_reserved:3; 38#elif defined(__BIG_ENDIAN_BITFIELD) 39 __u8 dccph_reserved:3, 40 dccph_type:4, 41 dccph_x:1; 42#else 43#error "Adjust your <asm/byteorder.h> defines" 44#endif 45 __u8 dccph_seq2; 46 __be16 dccph_seq; 47}; 48 49/** 50 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet 51 * 52 * @dccph_seq_low - low 24 bits of a 48 bit seq packet 53 */ 54struct dccp_hdr_ext { 55 __be32 dccph_seq_low; 56}; 57 58/** 59 * struct dccp_hdr_request - Connection initiation request header 60 * 61 * @dccph_req_service - Service to which the client app wants to connect 62 */ 63struct dccp_hdr_request { 64 __be32 dccph_req_service; 65}; 66/** 67 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets 68 * 69 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 70 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 71 */ 72struct dccp_hdr_ack_bits { 73 __be16 dccph_reserved1; 74 __be16 dccph_ack_nr_high; 75 __be32 dccph_ack_nr_low; 76}; 77/** 78 * struct dccp_hdr_response - Connection initiation response header 79 * 80 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3) 81 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request 82 */ 83struct dccp_hdr_response { 84 struct dccp_hdr_ack_bits dccph_resp_ack; 85 __be32 dccph_resp_service; 86}; 87 88/** 89 * struct dccp_hdr_reset - Unconditionally shut down a connection 90 * 91 * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6) 92 * @dccph_reset_code - one of %dccp_reset_codes 93 * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6 94 */ 95struct dccp_hdr_reset { 96 struct dccp_hdr_ack_bits dccph_reset_ack; 97 __u8 dccph_reset_code, 98 dccph_reset_data[3]; 99}; 100 101enum dccp_pkt_type { 102 DCCP_PKT_REQUEST = 0, 103 DCCP_PKT_RESPONSE, 104 DCCP_PKT_DATA, 105 DCCP_PKT_ACK, 106 DCCP_PKT_DATAACK, 107 DCCP_PKT_CLOSEREQ, 108 DCCP_PKT_CLOSE, 109 DCCP_PKT_RESET, 110 DCCP_PKT_SYNC, 111 DCCP_PKT_SYNCACK, 112 DCCP_PKT_INVALID, 113}; 114 115#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID 116 117static inline unsigned int dccp_packet_hdr_len(const __u8 type) 118{ 119 if (type == DCCP_PKT_DATA) 120 return 0; 121 if (type == DCCP_PKT_DATAACK || 122 type == DCCP_PKT_ACK || 123 type == DCCP_PKT_SYNC || 124 type == DCCP_PKT_SYNCACK || 125 type == DCCP_PKT_CLOSE || 126 type == DCCP_PKT_CLOSEREQ) 127 return sizeof(struct dccp_hdr_ack_bits); 128 if (type == DCCP_PKT_REQUEST) 129 return sizeof(struct dccp_hdr_request); 130 if (type == DCCP_PKT_RESPONSE) 131 return sizeof(struct dccp_hdr_response); 132 return sizeof(struct dccp_hdr_reset); 133} 134enum dccp_reset_codes { 135 DCCP_RESET_CODE_UNSPECIFIED = 0, 136 DCCP_RESET_CODE_CLOSED, 137 DCCP_RESET_CODE_ABORTED, 138 DCCP_RESET_CODE_NO_CONNECTION, 139 DCCP_RESET_CODE_PACKET_ERROR, 140 DCCP_RESET_CODE_OPTION_ERROR, 141 DCCP_RESET_CODE_MANDATORY_ERROR, 142 DCCP_RESET_CODE_CONNECTION_REFUSED, 143 DCCP_RESET_CODE_BAD_SERVICE_CODE, 144 DCCP_RESET_CODE_TOO_BUSY, 145 DCCP_RESET_CODE_BAD_INIT_COOKIE, 146 DCCP_RESET_CODE_AGGRESSION_PENALTY, 147 148 DCCP_MAX_RESET_CODES /* Leave at the end! */ 149}; 150 151/* DCCP options */ 152enum { 153 DCCPO_PADDING = 0, 154 DCCPO_MANDATORY = 1, 155 DCCPO_MIN_RESERVED = 3, 156 DCCPO_MAX_RESERVED = 31, 157 DCCPO_CHANGE_L = 32, 158 DCCPO_CONFIRM_L = 33, 159 DCCPO_CHANGE_R = 34, 160 DCCPO_CONFIRM_R = 35, 161 DCCPO_NDP_COUNT = 37, 162 DCCPO_ACK_VECTOR_0 = 38, 163 DCCPO_ACK_VECTOR_1 = 39, 164 DCCPO_TIMESTAMP = 41, 165 DCCPO_TIMESTAMP_ECHO = 42, 166 DCCPO_ELAPSED_TIME = 43, 167 DCCPO_MAX = 45, 168 DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */ 169 DCCPO_MAX_RX_CCID_SPECIFIC = 191, 170 DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */ 171 DCCPO_MAX_TX_CCID_SPECIFIC = 255, 172}; 173/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */ 174#define DCCP_SINGLE_OPT_MAXLEN 253 175 176/* DCCP CCIDS */ 177enum { 178 DCCPC_CCID2 = 2, 179 DCCPC_CCID3 = 3, 180}; 181 182/* DCCP features (RFC 4340 section 6.4) */ 183enum dccp_feature_numbers { 184 DCCPF_RESERVED = 0, 185 DCCPF_CCID = 1, 186 DCCPF_SHORT_SEQNOS = 2, 187 DCCPF_SEQUENCE_WINDOW = 3, 188 DCCPF_ECN_INCAPABLE = 4, 189 DCCPF_ACK_RATIO = 5, 190 DCCPF_SEND_ACK_VECTOR = 6, 191 DCCPF_SEND_NDP_COUNT = 7, 192 DCCPF_MIN_CSUM_COVER = 8, 193 DCCPF_DATA_CHECKSUM = 9, 194 /* 10-127 reserved */ 195 DCCPF_MIN_CCID_SPECIFIC = 128, 196 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */ 197 DCCPF_MAX_CCID_SPECIFIC = 255, 198}; 199 200/* DCCP socket control message types for cmsg */ 201enum dccp_cmsg_type { 202 DCCP_SCM_PRIORITY = 1, 203 DCCP_SCM_QPOLICY_MAX = 0xFFFF, 204 /* ^-- Up to here reserved exclusively for qpolicy parameters */ 205 DCCP_SCM_MAX 206}; 207 208/* DCCP priorities for outgoing/queued packets */ 209enum dccp_packet_dequeueing_policy { 210 DCCPQ_POLICY_SIMPLE, 211 DCCPQ_POLICY_PRIO, 212 DCCPQ_POLICY_MAX 213}; 214 215/* DCCP socket options */ 216#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ 217#define DCCP_SOCKOPT_SERVICE 2 218#define DCCP_SOCKOPT_CHANGE_L 3 219#define DCCP_SOCKOPT_CHANGE_R 4 220#define DCCP_SOCKOPT_GET_CUR_MPS 5 221#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 222#define DCCP_SOCKOPT_SEND_CSCOV 10 223#define DCCP_SOCKOPT_RECV_CSCOV 11 224#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 225#define DCCP_SOCKOPT_CCID 13 226#define DCCP_SOCKOPT_TX_CCID 14 227#define DCCP_SOCKOPT_RX_CCID 15 228#define DCCP_SOCKOPT_QPOLICY_ID 16 229#define DCCP_SOCKOPT_QPOLICY_TXQLEN 17 230#define DCCP_SOCKOPT_CCID_RX_INFO 128 231#define DCCP_SOCKOPT_CCID_TX_INFO 192 232 233/* maximum number of services provided on the same listening port */ 234#define DCCP_SERVICE_LIST_MAX_LEN 32 235 236 237#endif /* _UAPI_LINUX_DCCP_H */ 238