1 #ifndef _LINUX_DCCP_H 2 #define _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 */ 20 struct 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 */ 54 struct 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 */ 63 struct 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 */ 72 struct 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 */ 83 struct 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 */ 95 struct dccp_hdr_reset { 96 struct dccp_hdr_ack_bits dccph_reset_ack; 97 __u8 dccph_reset_code, 98 dccph_reset_data[3]; 99 }; 100 101 enum 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 116 117 static __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 } 134 enum 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 */ 152 enum { 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_CCID_SPECIFIC = 128, 169 DCCPO_MAX_CCID_SPECIFIC = 255, 170 }; 171 /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */ 172 #define DCCP_SINGLE_OPT_MAXLEN 253 173 174 /* DCCP CCIDS */ 175 enum { 176 DCCPC_CCID2 = 2, 177 DCCPC_CCID3 = 3, 178 }; 179 180 /* DCCP features (RFC 4340 section 6.4) */ 181 enum dccp_feature_numbers { 182 DCCPF_RESERVED = 0, 183 DCCPF_CCID = 1, 184 DCCPF_SHORT_SEQNOS = 2, 185 DCCPF_SEQUENCE_WINDOW = 3, 186 DCCPF_ECN_INCAPABLE = 4, 187 DCCPF_ACK_RATIO = 5, 188 DCCPF_SEND_ACK_VECTOR = 6, 189 DCCPF_SEND_NDP_COUNT = 7, 190 DCCPF_MIN_CSUM_COVER = 8, 191 DCCPF_DATA_CHECKSUM = 9, 192 /* 10-127 reserved */ 193 DCCPF_MIN_CCID_SPECIFIC = 128, 194 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */ 195 DCCPF_MAX_CCID_SPECIFIC = 255, 196 }; 197 198 /* DCCP socket options */ 199 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ 200 #define DCCP_SOCKOPT_SERVICE 2 201 #define DCCP_SOCKOPT_CHANGE_L 3 202 #define DCCP_SOCKOPT_CHANGE_R 4 203 #define DCCP_SOCKOPT_GET_CUR_MPS 5 204 #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 205 #define DCCP_SOCKOPT_SEND_CSCOV 10 206 #define DCCP_SOCKOPT_RECV_CSCOV 11 207 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 208 #define DCCP_SOCKOPT_CCID 13 209 #define DCCP_SOCKOPT_TX_CCID 14 210 #define DCCP_SOCKOPT_RX_CCID 15 211 #define DCCP_SOCKOPT_CCID_RX_INFO 128 212 #define DCCP_SOCKOPT_CCID_TX_INFO 192 213 214 /* maximum number of services provided on the same listening port */ 215 #define DCCP_SERVICE_LIST_MAX_LEN 32 216 217 218 #endif /* _LINUX_DCCP_H */ 219
