linux/include/linux/dccp.h
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   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 */
  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#ifdef __KERNEL__
 237
 238#include <linux/in.h>
 239#include <linux/interrupt.h>
 240#include <linux/ktime.h>
 241#include <linux/list.h>
 242#include <linux/uio.h>
 243#include <linux/workqueue.h>
 244
 245#include <net/inet_connection_sock.h>
 246#include <net/inet_sock.h>
 247#include <net/inet_timewait_sock.h>
 248#include <net/tcp_states.h>
 249
 250enum dccp_state {
 251        DCCP_OPEN            = TCP_ESTABLISHED,
 252        DCCP_REQUESTING      = TCP_SYN_SENT,
 253        DCCP_LISTEN          = TCP_LISTEN,
 254        DCCP_RESPOND         = TCP_SYN_RECV,
 255        /*
 256         * States involved in closing a DCCP connection:
 257         * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
 258         *
 259         * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
 260         *  a. Client has performed active-close, has sent a Close to the server
 261         *     from state OPEN or PARTOPEN, and is waiting for the final Reset
 262         *     (in this case, SOCK_DONE == 1).
 263         *  b. Client is asked to perform passive-close, by receiving a CloseReq
 264         *     in (PART)OPEN state. It sends a Close and waits for final Reset
 265         *     (in this case, SOCK_DONE == 0).
 266         *  c. Server performs an active-close as in (a), keeps TIMEWAIT state.
 267         *
 268         * 3) The following intermediate states are employed to give passively
 269         *    closing nodes a chance to process their unread data:
 270         *    - PASSIVE_CLOSE    (from OPEN => CLOSED) and
 271         *    - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
 272         */
 273        DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
 274        DCCP_PASSIVE_CLOSE   = TCP_CLOSE_WAIT,  /* any node receiving a Close */
 275        DCCP_CLOSING         = TCP_CLOSING,
 276        DCCP_TIME_WAIT       = TCP_TIME_WAIT,
 277        DCCP_CLOSED          = TCP_CLOSE,
 278        DCCP_PARTOPEN        = TCP_MAX_STATES,
 279        DCCP_PASSIVE_CLOSEREQ,                  /* clients receiving CloseReq */
 280        DCCP_MAX_STATES
 281};
 282
 283enum {
 284        DCCPF_OPEN            = TCPF_ESTABLISHED,
 285        DCCPF_REQUESTING      = TCPF_SYN_SENT,
 286        DCCPF_LISTEN          = TCPF_LISTEN,
 287        DCCPF_RESPOND         = TCPF_SYN_RECV,
 288        DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
 289        DCCPF_CLOSING         = TCPF_CLOSING,
 290        DCCPF_TIME_WAIT       = TCPF_TIME_WAIT,
 291        DCCPF_CLOSED          = TCPF_CLOSE,
 292        DCCPF_PARTOPEN        = (1 << DCCP_PARTOPEN),
 293};
 294
 295static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
 296{
 297        return (struct dccp_hdr *)skb_transport_header(skb);
 298}
 299
 300static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
 301{
 302        skb_push(skb, headlen);
 303        skb_reset_transport_header(skb);
 304        return memset(skb_transport_header(skb), 0, headlen);
 305}
 306
 307static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
 308{
 309        return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
 310}
 311
 312static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
 313{
 314        return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
 315}
 316
 317static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
 318{
 319        const struct dccp_hdr *dh = dccp_hdr(skb);
 320        return __dccp_basic_hdr_len(dh);
 321}
 322
 323static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
 324{
 325        __u64 seq_nr =  ntohs(dh->dccph_seq);
 326
 327        if (dh->dccph_x != 0)
 328                seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
 329        else
 330                seq_nr += (u32)dh->dccph_seq2 << 16;
 331
 332        return seq_nr;
 333}
 334
 335static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
 336{
 337        return (struct dccp_hdr_request *)(skb_transport_header(skb) +
 338                                           dccp_basic_hdr_len(skb));
 339}
 340
 341static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
 342{
 343        return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
 344                                            dccp_basic_hdr_len(skb));
 345}
 346
 347static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
 348{
 349        const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
 350        return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
 351}
 352
 353static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
 354{
 355        return (struct dccp_hdr_response *)(skb_transport_header(skb) +
 356                                            dccp_basic_hdr_len(skb));
 357}
 358
 359static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
 360{
 361        return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
 362                                         dccp_basic_hdr_len(skb));
 363}
 364
 365static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
 366{
 367        return __dccp_basic_hdr_len(dh) +
 368               dccp_packet_hdr_len(dh->dccph_type);
 369}
 370
 371static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
 372{
 373        return __dccp_hdr_len(dccp_hdr(skb));
 374}
 375
 376/**
 377 * struct dccp_request_sock  -  represent DCCP-specific connection request
 378 * @dreq_inet_rsk: structure inherited from
 379 * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
 380 * @dreq_gss: greatest sequence number sent (for retransmitted Responses)
 381 * @dreq_isr: initial sequence number received in the first Request
 382 * @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
 383 * @dreq_service: service code present on the Request (there is just one)
 384 * @dreq_featneg: feature negotiation options for this connection
 385 * The following two fields are analogous to the ones in dccp_sock:
 386 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
 387 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
 388 */
 389struct dccp_request_sock {
 390        struct inet_request_sock dreq_inet_rsk;
 391        __u64                    dreq_iss;
 392        __u64                    dreq_gss;
 393        __u64                    dreq_isr;
 394        __u64                    dreq_gsr;
 395        __be32                   dreq_service;
 396        struct list_head         dreq_featneg;
 397        __u32                    dreq_timestamp_echo;
 398        __u32                    dreq_timestamp_time;
 399};
 400
 401static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
 402{
 403        return (struct dccp_request_sock *)req;
 404}
 405
 406extern struct inet_timewait_death_row dccp_death_row;
 407
 408extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
 409                              struct sk_buff *skb);
 410
 411struct dccp_options_received {
 412        u64     dccpor_ndp:48;
 413        u32     dccpor_timestamp;
 414        u32     dccpor_timestamp_echo;
 415        u32     dccpor_elapsed_time;
 416};
 417
 418struct ccid;
 419
 420enum dccp_role {
 421        DCCP_ROLE_UNDEFINED,
 422        DCCP_ROLE_LISTEN,
 423        DCCP_ROLE_CLIENT,
 424        DCCP_ROLE_SERVER,
 425};
 426
 427struct dccp_service_list {
 428        __u32   dccpsl_nr;
 429        __be32  dccpsl_list[0];
 430};
 431
 432#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
 433#define DCCP_SERVICE_CODE_IS_ABSENT             0
 434
 435static inline int dccp_list_has_service(const struct dccp_service_list *sl,
 436                                        const __be32 service)
 437{
 438        if (likely(sl != NULL)) {
 439                u32 i = sl->dccpsl_nr;
 440                while (i--)
 441                        if (sl->dccpsl_list[i] == service)
 442                                return 1;
 443        }
 444        return 0;
 445}
 446
 447struct dccp_ackvec;
 448
 449/**
 450 * struct dccp_sock - DCCP socket state
 451 *
 452 * @dccps_swl - sequence number window low
 453 * @dccps_swh - sequence number window high
 454 * @dccps_awl - acknowledgement number window low
 455 * @dccps_awh - acknowledgement number window high
 456 * @dccps_iss - initial sequence number sent
 457 * @dccps_isr - initial sequence number received
 458 * @dccps_osr - first OPEN sequence number received
 459 * @dccps_gss - greatest sequence number sent
 460 * @dccps_gsr - greatest valid sequence number received
 461 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
 462 * @dccps_service - first (passive sock) or unique (active sock) service code
 463 * @dccps_service_list - second .. last service code on passive socket
 464 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
 465 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
 466 * @dccps_l_ack_ratio - feature-local Ack Ratio
 467 * @dccps_r_ack_ratio - feature-remote Ack Ratio
 468 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
 469 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
 470 * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
 471 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
 472 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
 473 * @dccps_ndp_count - number of Non Data Packets since last data packet
 474 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
 475 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
 476 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
 477 * @dccps_hc_rx_ackvec - rx half connection ack vector
 478 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
 479 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
 480 * @dccps_options_received - parsed set of retrieved options
 481 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
 482 * @dccps_tx_qlen - maximum length of the TX queue
 483 * @dccps_role - role of this sock, one of %dccp_role
 484 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
 485 * @dccps_hc_tx_insert_options - sender wants to add options when sending
 486 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
 487 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
 488 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
 489 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
 490 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
 491 */
 492struct dccp_sock {
 493        /* inet_connection_sock has to be the first member of dccp_sock */
 494        struct inet_connection_sock     dccps_inet_connection;
 495#define dccps_syn_rtt                   dccps_inet_connection.icsk_ack.lrcvtime
 496        __u64                           dccps_swl;
 497        __u64                           dccps_swh;
 498        __u64                           dccps_awl;
 499        __u64                           dccps_awh;
 500        __u64                           dccps_iss;
 501        __u64                           dccps_isr;
 502        __u64                           dccps_osr;
 503        __u64                           dccps_gss;
 504        __u64                           dccps_gsr;
 505        __u64                           dccps_gar;
 506        __be32                          dccps_service;
 507        __u32                           dccps_mss_cache;
 508        struct dccp_service_list        *dccps_service_list;
 509        __u32                           dccps_timestamp_echo;
 510        __u32                           dccps_timestamp_time;
 511        __u16                           dccps_l_ack_ratio;
 512        __u16                           dccps_r_ack_ratio;
 513        __u64                           dccps_l_seq_win:48;
 514        __u64                           dccps_r_seq_win:48;
 515        __u8                            dccps_pcslen:4;
 516        __u8                            dccps_pcrlen:4;
 517        __u8                            dccps_send_ndp_count:1;
 518        __u64                           dccps_ndp_count:48;
 519        unsigned long                   dccps_rate_last;
 520        struct list_head                dccps_featneg;
 521        struct dccp_ackvec              *dccps_hc_rx_ackvec;
 522        struct ccid                     *dccps_hc_rx_ccid;
 523        struct ccid                     *dccps_hc_tx_ccid;
 524        struct dccp_options_received    dccps_options_received;
 525        __u8                            dccps_qpolicy;
 526        __u32                           dccps_tx_qlen;
 527        enum dccp_role                  dccps_role:2;
 528        __u8                            dccps_hc_rx_insert_options:1;
 529        __u8                            dccps_hc_tx_insert_options:1;
 530        __u8                            dccps_server_timewait:1;
 531        __u8                            dccps_sync_scheduled:1;
 532        struct tasklet_struct           dccps_xmitlet;
 533        struct timer_list               dccps_xmit_timer;
 534};
 535
 536static inline struct dccp_sock *dccp_sk(const struct sock *sk)
 537{
 538        return (struct dccp_sock *)sk;
 539}
 540
 541static inline const char *dccp_role(const struct sock *sk)
 542{
 543        switch (dccp_sk(sk)->dccps_role) {
 544        case DCCP_ROLE_UNDEFINED: return "undefined";
 545        case DCCP_ROLE_LISTEN:    return "listen";
 546        case DCCP_ROLE_SERVER:    return "server";
 547        case DCCP_ROLE_CLIENT:    return "client";
 548        }
 549        return NULL;
 550}
 551
 552extern void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req);
 553
 554#endif /* __KERNEL__ */
 555
 556#endif /* _LINUX_DCCP_H */
 557
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