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 __u16 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 __u16 dccph_checksum; 34 #if defined(__LITTLE_ENDIAN_BITFIELD) 35 __u32 dccph_x:1, 36 dccph_type:4, 37 dccph_reserved:3, 38 dccph_seq:24; 39 #elif defined(__BIG_ENDIAN_BITFIELD) 40 __u32 dccph_reserved:3, 41 dccph_type:4, 42 dccph_x:1, 43 dccph_seq:24; 44 #else 45 #error "Adjust your <asm/byteorder.h> defines" 46 #endif 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 __u32 dccph_seq_low; 56 }; 57 58 /** 59 * struct dccp_hdr_request - Conection initiation request header 60 * 61 * @dccph_req_service - Service to which the client app wants to connect 62 * @dccph_req_options - list of options (must be a multiple of 32 bits 63 */ 64 struct dccp_hdr_request { 65 __u32 dccph_req_service; 66 }; 67 /** 68 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets 69 * 70 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 71 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 72 */ 73 struct dccp_hdr_ack_bits { 74 __u32 dccph_reserved1:8, 75 dccph_ack_nr_high:24; 76 __u32 dccph_ack_nr_low; 77 }; 78 /** 79 * struct dccp_hdr_response - Conection initiation response header 80 * 81 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 82 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 83 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request 84 * @dccph_resp_options - list of options (must be a multiple of 32 bits 85 */ 86 struct dccp_hdr_response { 87 struct dccp_hdr_ack_bits dccph_resp_ack; 88 __u32 dccph_resp_service; 89 }; 90 91 /** 92 * struct dccp_hdr_reset - Unconditionally shut down a connection 93 * 94 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request 95 * @dccph_reset_options - list of options (must be a multiple of 32 bits 96 */ 97 struct dccp_hdr_reset { 98 struct dccp_hdr_ack_bits dccph_reset_ack; 99 __u8 dccph_reset_code, 100 dccph_reset_data[3]; 101 }; 102 103 enum dccp_pkt_type { 104 DCCP_PKT_REQUEST = 0, 105 DCCP_PKT_RESPONSE, 106 DCCP_PKT_DATA, 107 DCCP_PKT_ACK, 108 DCCP_PKT_DATAACK, 109 DCCP_PKT_CLOSEREQ, 110 DCCP_PKT_CLOSE, 111 DCCP_PKT_RESET, 112 DCCP_PKT_SYNC, 113 DCCP_PKT_SYNCACK, 114 DCCP_PKT_INVALID, 115 }; 116 117 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID 118 119 static inline unsigned int dccp_packet_hdr_len(const __u8 type) 120 { 121 if (type == DCCP_PKT_DATA) 122 return 0; 123 if (type == DCCP_PKT_DATAACK || 124 type == DCCP_PKT_ACK || 125 type == DCCP_PKT_SYNC || 126 type == DCCP_PKT_SYNCACK || 127 type == DCCP_PKT_CLOSE || 128 type == DCCP_PKT_CLOSEREQ) 129 return sizeof(struct dccp_hdr_ack_bits); 130 if (type == DCCP_PKT_REQUEST) 131 return sizeof(struct dccp_hdr_request); 132 if (type == DCCP_PKT_RESPONSE) 133 return sizeof(struct dccp_hdr_response); 134 return sizeof(struct dccp_hdr_reset); 135 } 136 enum dccp_reset_codes { 137 DCCP_RESET_CODE_UNSPECIFIED = 0, 138 DCCP_RESET_CODE_CLOSED, 139 DCCP_RESET_CODE_ABORTED, 140 DCCP_RESET_CODE_NO_CONNECTION, 141 DCCP_RESET_CODE_PACKET_ERROR, 142 DCCP_RESET_CODE_OPTION_ERROR, 143 DCCP_RESET_CODE_MANDATORY_ERROR, 144 DCCP_RESET_CODE_CONNECTION_REFUSED, 145 DCCP_RESET_CODE_BAD_SERVICE_CODE, 146 DCCP_RESET_CODE_TOO_BUSY, 147 DCCP_RESET_CODE_BAD_INIT_COOKIE, 148 DCCP_RESET_CODE_AGGRESSION_PENALTY, 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_NDP_COUNT = 37, 158 DCCPO_ACK_VECTOR_0 = 38, 159 DCCPO_ACK_VECTOR_1 = 39, 160 DCCPO_TIMESTAMP = 41, 161 DCCPO_TIMESTAMP_ECHO = 42, 162 DCCPO_ELAPSED_TIME = 43, 163 DCCPO_MAX = 45, 164 DCCPO_MIN_CCID_SPECIFIC = 128, 165 DCCPO_MAX_CCID_SPECIFIC = 255, 166 }; 167 168 /* DCCP features */ 169 enum { 170 DCCPF_RESERVED = 0, 171 DCCPF_SEQUENCE_WINDOW = 3, 172 DCCPF_SEND_ACK_VECTOR = 6, 173 DCCPF_SEND_NDP_COUNT = 7, 174 /* 10-127 reserved */ 175 DCCPF_MIN_CCID_SPECIFIC = 128, 176 DCCPF_MAX_CCID_SPECIFIC = 255, 177 }; 178 179 /* DCCP socket options */ 180 #define DCCP_SOCKOPT_PACKET_SIZE 1 181 #define DCCP_SOCKOPT_SERVICE 2 182 #define DCCP_SOCKOPT_CCID_RX_INFO 128 183 #define DCCP_SOCKOPT_CCID_TX_INFO 192 184 185 #define DCCP_SERVICE_LIST_MAX_LEN 32 186 187 #ifdef __KERNEL__ 188 189 #include <linux/in.h> 190 #include <linux/list.h> 191 #include <linux/uio.h> 192 #include <linux/workqueue.h> 193 194 #include <net/inet_connection_sock.h> 195 #include <net/inet_sock.h> 196 #include <net/inet_timewait_sock.h> 197 #include <net/tcp_states.h> 198 199 enum dccp_state { 200 DCCP_OPEN = TCP_ESTABLISHED, 201 DCCP_REQUESTING = TCP_SYN_SENT, 202 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: 203 This mapping is horrible, but TCP has 204 no matching state for DCCP_PARTOPEN, 205 as TCP_SYN_RECV is already used by 206 DCCP_RESPOND, why don't stop using TCP 207 mapping of states? OK, now we don't use 208 sk_stream_sendmsg anymore, so doesn't 209 seem to exist any reason for us to 210 do the TCP mapping here */ 211 DCCP_LISTEN = TCP_LISTEN, 212 DCCP_RESPOND = TCP_SYN_RECV, 213 DCCP_CLOSING = TCP_CLOSING, 214 DCCP_TIME_WAIT = TCP_TIME_WAIT, 215 DCCP_CLOSED = TCP_CLOSE, 216 DCCP_MAX_STATES = TCP_MAX_STATES, 217 }; 218 219 #define DCCP_STATE_MASK 0xf 220 #define DCCP_ACTION_FIN (1<<7) 221 222 enum { 223 DCCPF_OPEN = TCPF_ESTABLISHED, 224 DCCPF_REQUESTING = TCPF_SYN_SENT, 225 DCCPF_PARTOPEN = TCPF_FIN_WAIT1, 226 DCCPF_LISTEN = TCPF_LISTEN, 227 DCCPF_RESPOND = TCPF_SYN_RECV, 228 DCCPF_CLOSING = TCPF_CLOSING, 229 DCCPF_TIME_WAIT = TCPF_TIME_WAIT, 230 DCCPF_CLOSED = TCPF_CLOSE, 231 }; 232 233 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) 234 { 235 return (struct dccp_hdr *)skb->h.raw; 236 } 237 238 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) 239 { 240 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); 241 } 242 243 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) 244 { 245 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); 246 } 247 248 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) 249 { 250 const struct dccp_hdr *dh = dccp_hdr(skb); 251 return __dccp_basic_hdr_len(dh); 252 } 253 254 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) 255 { 256 const struct dccp_hdr *dh = dccp_hdr(skb); 257 #if defined(__LITTLE_ENDIAN_BITFIELD) 258 __u64 seq_nr = ntohl(dh->dccph_seq << 8); 259 #elif defined(__BIG_ENDIAN_BITFIELD) 260 __u64 seq_nr = ntohl(dh->dccph_seq); 261 #else 262 #error "Adjust your <asm/byteorder.h> defines" 263 #endif 264 265 if (dh->dccph_x != 0) 266 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); 267 268 return seq_nr; 269 } 270 271 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) 272 { 273 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); 274 } 275 276 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) 277 { 278 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); 279 } 280 281 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) 282 { 283 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); 284 #if defined(__LITTLE_ENDIAN_BITFIELD) 285 return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low); 286 #elif defined(__BIG_ENDIAN_BITFIELD) 287 return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low); 288 #else 289 #error "Adjust your <asm/byteorder.h> defines" 290 #endif 291 } 292 293 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) 294 { 295 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); 296 } 297 298 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) 299 { 300 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); 301 } 302 303 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) 304 { 305 return __dccp_basic_hdr_len(dh) + 306 dccp_packet_hdr_len(dh->dccph_type); 307 } 308 309 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) 310 { 311 return __dccp_hdr_len(dccp_hdr(skb)); 312 } 313 314 315 /* initial values for each feature */ 316 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 317 /* FIXME: for now we're using CCID 3 (TFRC) */ 318 #define DCCPF_INITIAL_CCID 3 319 #define DCCPF_INITIAL_SEND_ACK_VECTOR 0 320 /* FIXME: for now we're default to 1 but it should really be 0 */ 321 #define DCCPF_INITIAL_SEND_NDP_COUNT 1 322 323 #define DCCP_NDP_LIMIT 0xFFFFFF 324 325 /** 326 * struct dccp_options - option values for a DCCP connection 327 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2) 328 * @dccpo_ccid - Congestion Control Id (CCID) (section 10) 329 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5) 330 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2) 331 */ 332 struct dccp_options { 333 __u64 dccpo_sequence_window; 334 __u8 dccpo_rx_ccid; 335 __u8 dccpo_tx_ccid; 336 __u8 dccpo_send_ack_vector; 337 __u8 dccpo_send_ndp_count; 338 }; 339 340 extern void __dccp_options_init(struct dccp_options *dccpo); 341 extern void dccp_options_init(struct dccp_options *dccpo); 342 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); 343 344 struct dccp_request_sock { 345 struct inet_request_sock dreq_inet_rsk; 346 __u64 dreq_iss; 347 __u64 dreq_isr; 348 __u32 dreq_service; 349 }; 350 351 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) 352 { 353 return (struct dccp_request_sock *)req; 354 } 355 356 extern struct inet_timewait_death_row dccp_death_row; 357 358 struct dccp_options_received { 359 u32 dccpor_ndp; /* only 24 bits */ 360 u32 dccpor_timestamp; 361 u32 dccpor_timestamp_echo; 362 u32 dccpor_elapsed_time; 363 }; 364 365 struct ccid; 366 367 enum dccp_role { 368 DCCP_ROLE_UNDEFINED, 369 DCCP_ROLE_LISTEN, 370 DCCP_ROLE_CLIENT, 371 DCCP_ROLE_SERVER, 372 }; 373 374 struct dccp_service_list { 375 __u32 dccpsl_nr; 376 __u32 dccpsl_list[0]; 377 }; 378 379 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) 380 381 static inline int dccp_list_has_service(const struct dccp_service_list *sl, 382 const u32 service) 383 { 384 if (likely(sl != NULL)) { 385 u32 i = sl->dccpsl_nr; 386 while (i--) 387 if (sl->dccpsl_list[i] == service) 388 return 1; 389 } 390 return 0; 391 } 392 393 struct dccp_ackvec; 394 395 /** 396 * struct dccp_sock - DCCP socket state 397 * 398 * @dccps_swl - sequence number window low 399 * @dccps_swh - sequence number window high 400 * @dccps_awl - acknowledgement number window low 401 * @dccps_awh - acknowledgement number window high 402 * @dccps_iss - initial sequence number sent 403 * @dccps_isr - initial sequence number received 404 * @dccps_osr - first OPEN sequence number received 405 * @dccps_gss - greatest sequence number sent 406 * @dccps_gsr - greatest valid sequence number received 407 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss 408 * @dccps_timestamp_time - time of latest TIMESTAMP option 409 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option 410 * @dccps_packet_size - Set thru setsockopt 411 * @dccps_role - Role of this sock, one of %dccp_role 412 * @dccps_ndp_count - number of Non Data Packets since last data packet 413 * @dccps_hc_rx_ackvec - rx half connection ack vector 414 */ 415 struct dccp_sock { 416 /* inet_connection_sock has to be the first member of dccp_sock */ 417 struct inet_connection_sock dccps_inet_connection; 418 __u64 dccps_swl; 419 __u64 dccps_swh; 420 __u64 dccps_awl; 421 __u64 dccps_awh; 422 __u64 dccps_iss; 423 __u64 dccps_isr; 424 __u64 dccps_osr; 425 __u64 dccps_gss; 426 __u64 dccps_gsr; 427 __u64 dccps_gar; 428 __u32 dccps_service; 429 struct dccp_service_list *dccps_service_list; 430 struct timeval dccps_timestamp_time; 431 __u32 dccps_timestamp_echo; 432 __u32 dccps_packet_size; 433 unsigned long dccps_ndp_count; 434 __u32 dccps_mss_cache; 435 struct dccp_options dccps_options; 436 struct dccp_ackvec *dccps_hc_rx_ackvec; 437 void *dccps_hc_rx_ccid_private; 438 void *dccps_hc_tx_ccid_private; 439 struct ccid *dccps_hc_rx_ccid; 440 struct ccid *dccps_hc_tx_ccid; 441 struct dccp_options_received dccps_options_received; 442 struct timeval dccps_epoch; 443 enum dccp_role dccps_role:2; 444 __u8 dccps_hc_rx_insert_options:1; 445 __u8 dccps_hc_tx_insert_options:1; 446 }; 447 448 static inline struct dccp_sock *dccp_sk(const struct sock *sk) 449 { 450 return (struct dccp_sock *)sk; 451 } 452 453 static inline int dccp_service_not_initialized(const struct sock *sk) 454 { 455 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE; 456 } 457 458 static inline const char *dccp_role(const struct sock *sk) 459 { 460 switch (dccp_sk(sk)->dccps_role) { 461 case DCCP_ROLE_UNDEFINED: return "undefined"; 462 case DCCP_ROLE_LISTEN: return "listen"; 463 case DCCP_ROLE_SERVER: return "server"; 464 case DCCP_ROLE_CLIENT: return "client"; 465 } 466 return NULL; 467 } 468 469 #endif /* __KERNEL__ */ 470 471 #endif /* _LINUX_DCCP_H */ 472