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 - 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 __be32 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 __be16 dccph_reserved1; 75 __be16 dccph_ack_nr_high; 76 __be32 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 __be32 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_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 }; 171 172 /* DCCP CCIDS */ 173 enum { 174 DCCPC_CCID2 = 2, 175 DCCPC_CCID3 = 3, 176 }; 177 178 /* DCCP features (RFC 4340 section 6.4) */ 179 enum { 180 DCCPF_RESERVED = 0, 181 DCCPF_CCID = 1, 182 DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */ 183 DCCPF_SEQUENCE_WINDOW = 3, 184 DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */ 185 DCCPF_ACK_RATIO = 5, 186 DCCPF_SEND_ACK_VECTOR = 6, 187 DCCPF_SEND_NDP_COUNT = 7, 188 DCCPF_MIN_CSUM_COVER = 8, 189 DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */ 190 /* 10-127 reserved */ 191 DCCPF_MIN_CCID_SPECIFIC = 128, 192 DCCPF_MAX_CCID_SPECIFIC = 255, 193 }; 194 195 /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */ 196 struct dccp_so_feat { 197 __u8 dccpsf_feat; 198 __u8 __user *dccpsf_val; 199 __u8 dccpsf_len; 200 }; 201 202 /* DCCP socket options */ 203 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ 204 #define DCCP_SOCKOPT_SERVICE 2 205 #define DCCP_SOCKOPT_CHANGE_L 3 206 #define DCCP_SOCKOPT_CHANGE_R 4 207 #define DCCP_SOCKOPT_SEND_CSCOV 10 208 #define DCCP_SOCKOPT_RECV_CSCOV 11 209 #define DCCP_SOCKOPT_CCID_RX_INFO 128 210 #define DCCP_SOCKOPT_CCID_TX_INFO 192 211 212 /* maximum number of services provided on the same listening port */ 213 #define DCCP_SERVICE_LIST_MAX_LEN 32 214 215 #ifdef __KERNEL__ 216 217 #include <linux/in.h> 218 #include <linux/list.h> 219 #include <linux/uio.h> 220 #include <linux/workqueue.h> 221 222 #include <net/inet_connection_sock.h> 223 #include <net/inet_sock.h> 224 #include <net/inet_timewait_sock.h> 225 #include <net/tcp_states.h> 226 227 enum dccp_state { 228 DCCP_OPEN = TCP_ESTABLISHED, 229 DCCP_REQUESTING = TCP_SYN_SENT, 230 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: 231 This mapping is horrible, but TCP has 232 no matching state for DCCP_PARTOPEN, 233 as TCP_SYN_RECV is already used by 234 DCCP_RESPOND, why don't stop using TCP 235 mapping of states? OK, now we don't use 236 sk_stream_sendmsg anymore, so doesn't 237 seem to exist any reason for us to 238 do the TCP mapping here */ 239 DCCP_LISTEN = TCP_LISTEN, 240 DCCP_RESPOND = TCP_SYN_RECV, 241 DCCP_CLOSING = TCP_CLOSING, 242 DCCP_TIME_WAIT = TCP_TIME_WAIT, 243 DCCP_CLOSED = TCP_CLOSE, 244 DCCP_MAX_STATES = TCP_MAX_STATES, 245 }; 246 247 #define DCCP_STATE_MASK 0xf 248 #define DCCP_ACTION_FIN (1<<7) 249 250 enum { 251 DCCPF_OPEN = TCPF_ESTABLISHED, 252 DCCPF_REQUESTING = TCPF_SYN_SENT, 253 DCCPF_PARTOPEN = TCPF_FIN_WAIT1, 254 DCCPF_LISTEN = TCPF_LISTEN, 255 DCCPF_RESPOND = TCPF_SYN_RECV, 256 DCCPF_CLOSING = TCPF_CLOSING, 257 DCCPF_TIME_WAIT = TCPF_TIME_WAIT, 258 DCCPF_CLOSED = TCPF_CLOSE, 259 }; 260 261 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) 262 { 263 return (struct dccp_hdr *)skb->h.raw; 264 } 265 266 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) 267 { 268 skb->h.raw = skb_push(skb, headlen); 269 memset(skb->h.raw, 0, headlen); 270 return dccp_hdr(skb); 271 } 272 273 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) 274 { 275 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); 276 } 277 278 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) 279 { 280 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); 281 } 282 283 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) 284 { 285 const struct dccp_hdr *dh = dccp_hdr(skb); 286 return __dccp_basic_hdr_len(dh); 287 } 288 289 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) 290 { 291 const struct dccp_hdr *dh = dccp_hdr(skb); 292 __u64 seq_nr = ntohs(dh->dccph_seq); 293 294 if (dh->dccph_x != 0) 295 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); 296 else 297 seq_nr += (u32)dh->dccph_seq2 << 16; 298 299 return seq_nr; 300 } 301 302 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) 303 { 304 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); 305 } 306 307 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) 308 { 309 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); 310 } 311 312 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) 313 { 314 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); 315 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); 316 } 317 318 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) 319 { 320 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); 321 } 322 323 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) 324 { 325 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); 326 } 327 328 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) 329 { 330 return __dccp_basic_hdr_len(dh) + 331 dccp_packet_hdr_len(dh->dccph_type); 332 } 333 334 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) 335 { 336 return __dccp_hdr_len(dccp_hdr(skb)); 337 } 338 339 340 /* initial values for each feature */ 341 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 342 #define DCCPF_INITIAL_ACK_RATIO 2 343 #define DCCPF_INITIAL_CCID DCCPC_CCID2 344 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1 345 /* FIXME: for now we're default to 1 but it should really be 0 */ 346 #define DCCPF_INITIAL_SEND_NDP_COUNT 1 347 348 #define DCCP_NDP_LIMIT 0xFFFFFF 349 350 /** 351 * struct dccp_minisock - Minimal DCCP connection representation 352 * 353 * Will be used to pass the state from dccp_request_sock to dccp_sock. 354 * 355 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2) 356 * @dccpms_ccid - Congestion Control Id (CCID) (section 10) 357 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5) 358 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2) 359 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3) 360 * @dccpms_pending - List of features being negotiated 361 * @dccpms_conf - 362 */ 363 struct dccp_minisock { 364 __u64 dccpms_sequence_window; 365 __u8 dccpms_rx_ccid; 366 __u8 dccpms_tx_ccid; 367 __u8 dccpms_send_ack_vector; 368 __u8 dccpms_send_ndp_count; 369 __u8 dccpms_ack_ratio; 370 struct list_head dccpms_pending; 371 struct list_head dccpms_conf; 372 }; 373 374 struct dccp_opt_conf { 375 __u8 *dccpoc_val; 376 __u8 dccpoc_len; 377 }; 378 379 struct dccp_opt_pend { 380 struct list_head dccpop_node; 381 __u8 dccpop_type; 382 __u8 dccpop_feat; 383 __u8 *dccpop_val; 384 __u8 dccpop_len; 385 int dccpop_conf; 386 struct dccp_opt_conf *dccpop_sc; 387 }; 388 389 extern void __dccp_minisock_init(struct dccp_minisock *dmsk); 390 extern void dccp_minisock_init(struct dccp_minisock *dmsk); 391 392 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); 393 394 struct dccp_request_sock { 395 struct inet_request_sock dreq_inet_rsk; 396 __u64 dreq_iss; 397 __u64 dreq_isr; 398 __be32 dreq_service; 399 }; 400 401 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) 402 { 403 return (struct dccp_request_sock *)req; 404 } 405 406 extern struct inet_timewait_death_row dccp_death_row; 407 408 struct dccp_options_received { 409 u32 dccpor_ndp; /* only 24 bits */ 410 u32 dccpor_timestamp; 411 u32 dccpor_timestamp_echo; 412 u32 dccpor_elapsed_time; 413 }; 414 415 struct ccid; 416 417 enum dccp_role { 418 DCCP_ROLE_UNDEFINED, 419 DCCP_ROLE_LISTEN, 420 DCCP_ROLE_CLIENT, 421 DCCP_ROLE_SERVER, 422 }; 423 424 struct dccp_service_list { 425 __u32 dccpsl_nr; 426 __be32 dccpsl_list[0]; 427 }; 428 429 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) 430 #define DCCP_SERVICE_CODE_IS_ABSENT 0 431 432 static inline int dccp_list_has_service(const struct dccp_service_list *sl, 433 const __be32 service) 434 { 435 if (likely(sl != NULL)) { 436 u32 i = sl->dccpsl_nr; 437 while (i--) 438 if (sl->dccpsl_list[i] == service) 439 return 1; 440 } 441 return 0; 442 } 443 444 struct dccp_ackvec; 445 446 /** 447 * struct dccp_sock - DCCP socket state 448 * 449 * @dccps_swl - sequence number window low 450 * @dccps_swh - sequence number window high 451 * @dccps_awl - acknowledgement number window low 452 * @dccps_awh - acknowledgement number window high 453 * @dccps_iss - initial sequence number sent 454 * @dccps_isr - initial sequence number received 455 * @dccps_osr - first OPEN sequence number received 456 * @dccps_gss - greatest sequence number sent 457 * @dccps_gsr - greatest valid sequence number received 458 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss 459 * @dccps_service - first (passive sock) or unique (active sock) service code 460 * @dccps_service_list - second .. last service code on passive socket 461 * @dccps_timestamp_time - time of latest TIMESTAMP option 462 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option 463 * @dccps_l_ack_ratio - 464 * @dccps_r_ack_ratio - 465 * @dccps_pcslen - sender partial checksum coverage (via sockopt) 466 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt) 467 * @dccps_ndp_count - number of Non Data Packets since last data packet 468 * @dccps_mss_cache - 469 * @dccps_minisock - 470 * @dccps_hc_rx_ackvec - rx half connection ack vector 471 * @dccps_hc_rx_ccid - 472 * @dccps_hc_tx_ccid - 473 * @dccps_options_received - 474 * @dccps_epoch - 475 * @dccps_role - Role of this sock, one of %dccp_role 476 * @dccps_hc_rx_insert_options - 477 * @dccps_hc_tx_insert_options - 478 * @dccps_xmit_timer - timer for when CCID is not ready to send 479 */ 480 struct dccp_sock { 481 /* inet_connection_sock has to be the first member of dccp_sock */ 482 struct inet_connection_sock dccps_inet_connection; 483 __u64 dccps_swl; 484 __u64 dccps_swh; 485 __u64 dccps_awl; 486 __u64 dccps_awh; 487 __u64 dccps_iss; 488 __u64 dccps_isr; 489 __u64 dccps_osr; 490 __u64 dccps_gss; 491 __u64 dccps_gsr; 492 __u64 dccps_gar; 493 __be32 dccps_service; 494 struct dccp_service_list *dccps_service_list; 495 struct timeval dccps_timestamp_time; 496 __u32 dccps_timestamp_echo; 497 __u16 dccps_l_ack_ratio; 498 __u16 dccps_r_ack_ratio; 499 __u16 dccps_pcslen; 500 __u16 dccps_pcrlen; 501 unsigned long dccps_ndp_count; 502 __u32 dccps_mss_cache; 503 struct dccp_minisock dccps_minisock; 504 struct dccp_ackvec *dccps_hc_rx_ackvec; 505 struct ccid *dccps_hc_rx_ccid; 506 struct ccid *dccps_hc_tx_ccid; 507 struct dccp_options_received dccps_options_received; 508 struct timeval dccps_epoch; 509 enum dccp_role dccps_role:2; 510 __u8 dccps_hc_rx_insert_options:1; 511 __u8 dccps_hc_tx_insert_options:1; 512 struct timer_list dccps_xmit_timer; 513 }; 514 515 static inline struct dccp_sock *dccp_sk(const struct sock *sk) 516 { 517 return (struct dccp_sock *)sk; 518 } 519 520 static inline struct dccp_minisock *dccp_msk(const struct sock *sk) 521 { 522 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock; 523 } 524 525 static inline const char *dccp_role(const struct sock *sk) 526 { 527 switch (dccp_sk(sk)->dccps_role) { 528 case DCCP_ROLE_UNDEFINED: return "undefined"; 529 case DCCP_ROLE_LISTEN: return "listen"; 530 case DCCP_ROLE_SERVER: return "server"; 531 case DCCP_ROLE_CLIENT: return "client"; 532 } 533 return NULL; 534 } 535 536 #endif /* __KERNEL__ */ 537 538 #endif /* _LINUX_DCCP_H */ 539