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_transport_header(skb); 264 } 265 266 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) 267 { 268 skb_push(skb, headlen); 269 skb_reset_transport_header(skb); 270 return memset(skb_transport_header(skb), 0, headlen); 271 } 272 273 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) 274 { 275 return (struct dccp_hdr_ext *)(skb_transport_header(skb) + 276 sizeof(struct dccp_hdr)); 277 } 278 279 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) 280 { 281 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); 282 } 283 284 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) 285 { 286 const struct dccp_hdr *dh = dccp_hdr(skb); 287 return __dccp_basic_hdr_len(dh); 288 } 289 290 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) 291 { 292 const struct dccp_hdr *dh = dccp_hdr(skb); 293 __u64 seq_nr = ntohs(dh->dccph_seq); 294 295 if (dh->dccph_x != 0) 296 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); 297 else 298 seq_nr += (u32)dh->dccph_seq2 << 16; 299 300 return seq_nr; 301 } 302 303 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) 304 { 305 return (struct dccp_hdr_request *)(skb_transport_header(skb) + 306 dccp_basic_hdr_len(skb)); 307 } 308 309 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) 310 { 311 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) + 312 dccp_basic_hdr_len(skb)); 313 } 314 315 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) 316 { 317 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); 318 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); 319 } 320 321 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) 322 { 323 return (struct dccp_hdr_response *)(skb_transport_header(skb) + 324 dccp_basic_hdr_len(skb)); 325 } 326 327 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) 328 { 329 return (struct dccp_hdr_reset *)(skb_transport_header(skb) + 330 dccp_basic_hdr_len(skb)); 331 } 332 333 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) 334 { 335 return __dccp_basic_hdr_len(dh) + 336 dccp_packet_hdr_len(dh->dccph_type); 337 } 338 339 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) 340 { 341 return __dccp_hdr_len(dccp_hdr(skb)); 342 } 343 344 345 /* initial values for each feature */ 346 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 347 #define DCCPF_INITIAL_ACK_RATIO 2 348 #define DCCPF_INITIAL_CCID DCCPC_CCID2 349 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1 350 /* FIXME: for now we're default to 1 but it should really be 0 */ 351 #define DCCPF_INITIAL_SEND_NDP_COUNT 1 352 353 #define DCCP_NDP_LIMIT 0xFFFFFF 354 355 /** 356 * struct dccp_minisock - Minimal DCCP connection representation 357 * 358 * Will be used to pass the state from dccp_request_sock to dccp_sock. 359 * 360 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2) 361 * @dccpms_ccid - Congestion Control Id (CCID) (section 10) 362 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5) 363 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2) 364 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3) 365 * @dccpms_pending - List of features being negotiated 366 * @dccpms_conf - 367 */ 368 struct dccp_minisock { 369 __u64 dccpms_sequence_window; 370 __u8 dccpms_rx_ccid; 371 __u8 dccpms_tx_ccid; 372 __u8 dccpms_send_ack_vector; 373 __u8 dccpms_send_ndp_count; 374 __u8 dccpms_ack_ratio; 375 struct list_head dccpms_pending; 376 struct list_head dccpms_conf; 377 }; 378 379 struct dccp_opt_conf { 380 __u8 *dccpoc_val; 381 __u8 dccpoc_len; 382 }; 383 384 struct dccp_opt_pend { 385 struct list_head dccpop_node; 386 __u8 dccpop_type; 387 __u8 dccpop_feat; 388 __u8 *dccpop_val; 389 __u8 dccpop_len; 390 int dccpop_conf; 391 struct dccp_opt_conf *dccpop_sc; 392 }; 393 394 extern void __dccp_minisock_init(struct dccp_minisock *dmsk); 395 extern void dccp_minisock_init(struct dccp_minisock *dmsk); 396 397 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); 398 399 struct dccp_request_sock { 400 struct inet_request_sock dreq_inet_rsk; 401 __u64 dreq_iss; 402 __u64 dreq_isr; 403 __be32 dreq_service; 404 }; 405 406 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) 407 { 408 return (struct dccp_request_sock *)req; 409 } 410 411 extern struct inet_timewait_death_row dccp_death_row; 412 413 struct dccp_options_received { 414 u32 dccpor_ndp; /* only 24 bits */ 415 u32 dccpor_timestamp; 416 u32 dccpor_timestamp_echo; 417 u32 dccpor_elapsed_time; 418 }; 419 420 struct ccid; 421 422 enum dccp_role { 423 DCCP_ROLE_UNDEFINED, 424 DCCP_ROLE_LISTEN, 425 DCCP_ROLE_CLIENT, 426 DCCP_ROLE_SERVER, 427 }; 428 429 struct dccp_service_list { 430 __u32 dccpsl_nr; 431 __be32 dccpsl_list[0]; 432 }; 433 434 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) 435 #define DCCP_SERVICE_CODE_IS_ABSENT 0 436 437 static inline int dccp_list_has_service(const struct dccp_service_list *sl, 438 const __be32 service) 439 { 440 if (likely(sl != NULL)) { 441 u32 i = sl->dccpsl_nr; 442 while (i--) 443 if (sl->dccpsl_list[i] == service) 444 return 1; 445 } 446 return 0; 447 } 448 449 struct dccp_ackvec; 450 451 /** 452 * struct dccp_sock - DCCP socket state 453 * 454 * @dccps_swl - sequence number window low 455 * @dccps_swh - sequence number window high 456 * @dccps_awl - acknowledgement number window low 457 * @dccps_awh - acknowledgement number window high 458 * @dccps_iss - initial sequence number sent 459 * @dccps_isr - initial sequence number received 460 * @dccps_osr - first OPEN sequence number received 461 * @dccps_gss - greatest sequence number sent 462 * @dccps_gsr - greatest valid sequence number received 463 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss 464 * @dccps_service - first (passive sock) or unique (active sock) service code 465 * @dccps_service_list - second .. last service code on passive socket 466 * @dccps_timestamp_time - time of latest TIMESTAMP option 467 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option 468 * @dccps_l_ack_ratio - feature-local Ack Ratio 469 * @dccps_r_ack_ratio - feature-remote Ack Ratio 470 * @dccps_pcslen - sender partial checksum coverage (via sockopt) 471 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt) 472 * @dccps_ndp_count - number of Non Data Packets since last data packet 473 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes) 474 * @dccps_minisock - associated minisock (accessed via dccp_msk) 475 * @dccps_hc_rx_ackvec - rx half connection ack vector 476 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection) 477 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection) 478 * @dccps_options_received - parsed set of retrieved options 479 * @dccps_role - role of this sock, one of %dccp_role 480 * @dccps_hc_rx_insert_options - receiver wants to add options when acking 481 * @dccps_hc_tx_insert_options - sender wants to add options when sending 482 * @dccps_xmit_timer - timer for when CCID is not ready to send 483 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs) 484 */ 485 struct dccp_sock { 486 /* inet_connection_sock has to be the first member of dccp_sock */ 487 struct inet_connection_sock dccps_inet_connection; 488 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime 489 __u64 dccps_swl; 490 __u64 dccps_swh; 491 __u64 dccps_awl; 492 __u64 dccps_awh; 493 __u64 dccps_iss; 494 __u64 dccps_isr; 495 __u64 dccps_osr; 496 __u64 dccps_gss; 497 __u64 dccps_gsr; 498 __u64 dccps_gar; 499 __be32 dccps_service; 500 struct dccp_service_list *dccps_service_list; 501 struct timeval dccps_timestamp_time; 502 __u32 dccps_timestamp_echo; 503 __u16 dccps_l_ack_ratio; 504 __u16 dccps_r_ack_ratio; 505 __u16 dccps_pcslen; 506 __u16 dccps_pcrlen; 507 unsigned long dccps_ndp_count; 508 __u32 dccps_mss_cache; 509 struct dccp_minisock dccps_minisock; 510 struct dccp_ackvec *dccps_hc_rx_ackvec; 511 struct ccid *dccps_hc_rx_ccid; 512 struct ccid *dccps_hc_tx_ccid; 513 struct dccp_options_received dccps_options_received; 514 struct timeval dccps_epoch; 515 enum dccp_role dccps_role:2; 516 __u8 dccps_hc_rx_insert_options:1; 517 __u8 dccps_hc_tx_insert_options:1; 518 struct timer_list dccps_xmit_timer; 519 }; 520 521 static inline struct dccp_sock *dccp_sk(const struct sock *sk) 522 { 523 return (struct dccp_sock *)sk; 524 } 525 526 static inline struct dccp_minisock *dccp_msk(const struct sock *sk) 527 { 528 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock; 529 } 530 531 static inline const char *dccp_role(const struct sock *sk) 532 { 533 switch (dccp_sk(sk)->dccps_role) { 534 case DCCP_ROLE_UNDEFINED: return "undefined"; 535 case DCCP_ROLE_LISTEN: return "listen"; 536 case DCCP_ROLE_SERVER: return "server"; 537 case DCCP_ROLE_CLIENT: return "client"; 538 } 539 return NULL; 540 } 541 542 #endif /* __KERNEL__ */ 543 544 #endif /* _LINUX_DCCP_H */ 545