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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 /* Structure describing an Internet (DCCP) socket address. */
   8 struct sockaddr_dccp {
   9         __u16   sdccp_family;   /* Address family   */
  10         __u16   sdccp_port;     /* Port number      */
  11         __u32   sdccp_addr;     /* Internet address */
  12         __u32   sdccp_service;  /* Service          */
  13         /* Pad to size of `struct sockaddr': 16 bytes . */
  14         __u32   sdccp_pad;
  15 };
  16
  17 /**
  18  * struct dccp_hdr - generic part of DCCP packet header
  19  *
  20  * @dccph_sport - Relevant port on the endpoint that sent this packet
  21  * @dccph_dport - Relevant port on the other endpoint
  22  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  23  * @dccph_ccval - Used by the HC-Sender CCID
  24  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  25  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  26  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  27  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  28  * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
  29  */
  30 struct dccp_hdr {
  31         __u16   dccph_sport,
  32                 dccph_dport;
  33         __u8    dccph_doff;
  34 #if defined(__LITTLE_ENDIAN_BITFIELD)
  35         __u8    dccph_cscov:4,
  36                 dccph_ccval:4;
  37 #elif defined(__BIG_ENDIAN_BITFIELD)
  38         __u8    dccph_ccval:4,
  39                 dccph_cscov:4;
  40 #else
  41 #error  "Adjust your <asm/byteorder.h> defines"
  42 #endif
  43         __u16   dccph_checksum;
  44 #if defined(__LITTLE_ENDIAN_BITFIELD)
  45         __u32   dccph_x:1,
  46                 dccph_type:4,
  47                 dccph_reserved:3,
  48                 dccph_seq:24;
  49 #elif defined(__BIG_ENDIAN_BITFIELD)
  50         __u32   dccph_reserved:3,
  51                 dccph_type:4,
  52                 dccph_x:1,
  53                 dccph_seq:24;
  54 #else
  55 #error  "Adjust your <asm/byteorder.h> defines"
  56 #endif
  57 };
  58
  59 /**
  60  * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
  61  *
  62  * @dccph_seq_low - low 24 bits of a 48 bit seq packet
  63  */
  64 struct dccp_hdr_ext {
  65         __u32   dccph_seq_low;
  66 };
  67
  68 /**
  69  * struct dccp_hdr_request - Conection initiation request header
  70  *
  71  * @dccph_req_service - Service to which the client app wants to connect
  72  * @dccph_req_options - list of options (must be a multiple of 32 bits
  73  */
  74 struct dccp_hdr_request {
  75         __u32   dccph_req_service;
  76 };
  77 /**
  78  * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
  79  *
  80  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  81  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  82  */
  83 struct dccp_hdr_ack_bits {
  84         __u32   dccph_reserved1:8,
  85                 dccph_ack_nr_high:24;
  86         __u32   dccph_ack_nr_low;
  87 };
  88 /**
  89  * struct dccp_hdr_response - Conection initiation response header
  90  *
  91  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  92  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  93  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  94  * @dccph_resp_options - list of options (must be a multiple of 32 bits
  95  */
  96 struct dccp_hdr_response {
  97         struct dccp_hdr_ack_bits        dccph_resp_ack;
  98         __u32                           dccph_resp_service;
  99 };
 100
 101 /**
 102  * struct dccp_hdr_reset - Unconditionally shut down a connection
 103  *
 104  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 105  * @dccph_reset_options - list of options (must be a multiple of 32 bits
 106  */
 107 struct dccp_hdr_reset {
 108         struct dccp_hdr_ack_bits        dccph_reset_ack;
 109         __u8                            dccph_reset_code,
 110                                         dccph_reset_data[3];
 111 };
 112
 113 enum dccp_pkt_type {
 114         DCCP_PKT_REQUEST = 0,
 115         DCCP_PKT_RESPONSE,
 116         DCCP_PKT_DATA,
 117         DCCP_PKT_ACK,
 118         DCCP_PKT_DATAACK,
 119         DCCP_PKT_CLOSEREQ,
 120         DCCP_PKT_CLOSE,
 121         DCCP_PKT_RESET,
 122         DCCP_PKT_SYNC,
 123         DCCP_PKT_SYNCACK,
 124         DCCP_PKT_INVALID,
 125 };
 126
 127 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
 128
 129 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
 130 {
 131         if (type == DCCP_PKT_DATA)
 132                 return 0;
 133         if (type == DCCP_PKT_DATAACK    ||
 134             type == DCCP_PKT_ACK        ||
 135             type == DCCP_PKT_SYNC       ||
 136             type == DCCP_PKT_SYNCACK    ||
 137             type == DCCP_PKT_CLOSE      ||
 138             type == DCCP_PKT_CLOSEREQ)
 139                 return sizeof(struct dccp_hdr_ack_bits);
 140         if (type == DCCP_PKT_REQUEST)
 141                 return sizeof(struct dccp_hdr_request);
 142         if (type == DCCP_PKT_RESPONSE)
 143                 return sizeof(struct dccp_hdr_response);
 144         return sizeof(struct dccp_hdr_reset);
 145 }
 146 enum dccp_reset_codes {
 147         DCCP_RESET_CODE_UNSPECIFIED = 0,
 148         DCCP_RESET_CODE_CLOSED,
 149         DCCP_RESET_CODE_ABORTED,
 150         DCCP_RESET_CODE_NO_CONNECTION,
 151         DCCP_RESET_CODE_PACKET_ERROR,
 152         DCCP_RESET_CODE_OPTION_ERROR,
 153         DCCP_RESET_CODE_MANDATORY_ERROR,
 154         DCCP_RESET_CODE_CONNECTION_REFUSED,
 155         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 156         DCCP_RESET_CODE_TOO_BUSY,
 157         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 158         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 159 };
 160
 161 /* DCCP options */
 162 enum {
 163         DCCPO_PADDING = 0,
 164         DCCPO_MANDATORY = 1,
 165         DCCPO_MIN_RESERVED = 3,
 166         DCCPO_MAX_RESERVED = 31,
 167         DCCPO_NDP_COUNT = 37,
 168         DCCPO_ACK_VECTOR_0 = 38,
 169         DCCPO_ACK_VECTOR_1 = 39,
 170         DCCPO_TIMESTAMP = 41,
 171         DCCPO_TIMESTAMP_ECHO = 42,
 172         DCCPO_ELAPSED_TIME = 43,
 173         DCCPO_MAX = 45,
 174         DCCPO_MIN_CCID_SPECIFIC = 128,
 175         DCCPO_MAX_CCID_SPECIFIC = 255,
 176 };
 177
 178 /* DCCP features */
 179 enum {
 180         DCCPF_RESERVED = 0,
 181         DCCPF_SEQUENCE_WINDOW = 3,
 182         DCCPF_SEND_ACK_VECTOR = 6,
 183         DCCPF_SEND_NDP_COUNT = 7,
 184         /* 10-127 reserved */
 185         DCCPF_MIN_CCID_SPECIFIC = 128,
 186         DCCPF_MAX_CCID_SPECIFIC = 255,
 187 };
 188
 189 /* DCCP socket options */
 190 #define DCCP_SOCKOPT_PACKET_SIZE        1
 191
 192 #ifdef __KERNEL__
 193
 194 #include <linux/in.h>
 195 #include <linux/list.h>
 196 #include <linux/uio.h>
 197 #include <linux/workqueue.h>
 198
 199 #include <net/inet_connection_sock.h>
 200 #include <net/inet_timewait_sock.h>
 201 #include <net/sock.h>
 202 #include <net/tcp_states.h>
 203 #include <net/tcp.h>
 204
 205 enum dccp_state {
 206         DCCP_OPEN       = TCP_ESTABLISHED,
 207         DCCP_REQUESTING = TCP_SYN_SENT,
 208         DCCP_PARTOPEN   = TCP_FIN_WAIT1, /* FIXME:
 209                                             This mapping is horrible, but TCP has
 210                                             no matching state for DCCP_PARTOPEN,
 211                                             as TCP_SYN_RECV is already used by
 212                                             DCCP_RESPOND, why don't stop using TCP
 213                                             mapping of states? OK, now we don't use
 214                                             sk_stream_sendmsg anymore, so doesn't
 215                                             seem to exist any reason for us to
 216                                             do the TCP mapping here */
 217         DCCP_LISTEN     = TCP_LISTEN,
 218         DCCP_RESPOND    = TCP_SYN_RECV,
 219         DCCP_CLOSING    = TCP_CLOSING,
 220         DCCP_TIME_WAIT  = TCP_TIME_WAIT,
 221         DCCP_CLOSED     = TCP_CLOSE,
 222         DCCP_MAX_STATES = TCP_MAX_STATES,
 223 };
 224
 225 #define DCCP_STATE_MASK 0xf
 226 #define DCCP_ACTION_FIN (1<<7)
 227
 228 enum {
 229         DCCPF_OPEN       = TCPF_ESTABLISHED,
 230         DCCPF_REQUESTING = TCPF_SYN_SENT,
 231         DCCPF_PARTOPEN   = TCPF_FIN_WAIT1,
 232         DCCPF_LISTEN     = TCPF_LISTEN,
 233         DCCPF_RESPOND    = TCPF_SYN_RECV,
 234         DCCPF_CLOSING    = TCPF_CLOSING,
 235         DCCPF_TIME_WAIT  = TCPF_TIME_WAIT,
 236         DCCPF_CLOSED     = TCPF_CLOSE,
 237 };
 238
 239 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
 240 {
 241         return (struct dccp_hdr *)skb->h.raw;
 242 }
 243
 244 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
 245 {
 246         return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
 247 }
 248
 249 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
 250 {
 251         return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
 252 }
 253
 254 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
 255 {
 256         const struct dccp_hdr *dh = dccp_hdr(skb);
 257         return __dccp_basic_hdr_len(dh);
 258 }
 259
 260 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
 261 {
 262         const struct dccp_hdr *dh = dccp_hdr(skb);
 263 #if defined(__LITTLE_ENDIAN_BITFIELD)
 264         __u64 seq_nr = ntohl(dh->dccph_seq << 8);
 265 #elif defined(__BIG_ENDIAN_BITFIELD)
 266         __u64 seq_nr = ntohl(dh->dccph_seq);
 267 #else
 268 #error  "Adjust your <asm/byteorder.h> defines"
 269 #endif
 270
 271         if (dh->dccph_x != 0)
 272                 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
 273
 274         return seq_nr;
 275 }
 276
 277 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
 278 {
 279         return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
 280 }
 281
 282 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
 283 {
 284         return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
 285 }
 286
 287 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
 288 {
 289         const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
 290 #if defined(__LITTLE_ENDIAN_BITFIELD)
 291         return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
 292 #elif defined(__BIG_ENDIAN_BITFIELD)
 293         return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
 294 #else
 295 #error  "Adjust your <asm/byteorder.h> defines"
 296 #endif
 297 }
 298
 299 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
 300 {
 301         return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
 302 }
 303
 304 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
 305 {
 306         return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
 307 }
 308
 309 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
 310 {
 311         return __dccp_basic_hdr_len(dh) +
 312                dccp_packet_hdr_len(dh->dccph_type);
 313 }
 314
 315 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
 316 {
 317         return __dccp_hdr_len(dccp_hdr(skb));
 318 }
 319
 320
 321 /* initial values for each feature */
 322 #define DCCPF_INITIAL_SEQUENCE_WINDOW           100
 323 /* FIXME: for now we're using CCID 3 (TFRC) */
 324 #define DCCPF_INITIAL_CCID                      3
 325 #define DCCPF_INITIAL_SEND_ACK_VECTOR           0
 326 /* FIXME: for now we're default to 1 but it should really be 0 */
 327 #define DCCPF_INITIAL_SEND_NDP_COUNT            1
 328
 329 #define DCCP_NDP_LIMIT 0xFFFFFF
 330
 331 /**
 332   * struct dccp_options - option values for a DCCP connection
 333   *     @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
 334   *     @dccpo_ccid - Congestion Control Id (CCID) (section 10)
 335   *     @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
 336   *     @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
 337   */
 338 struct dccp_options {
 339         __u64   dccpo_sequence_window;
 340         __u8    dccpo_ccid;
 341         __u8    dccpo_send_ack_vector;
 342         __u8    dccpo_send_ndp_count;
 343 };
 344
 345 extern void __dccp_options_init(struct dccp_options *dccpo);
 346 extern void dccp_options_init(struct dccp_options *dccpo);
 347 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
 348
 349 struct dccp_request_sock {
 350         struct inet_request_sock dreq_inet_rsk;
 351         __u64                    dreq_iss;
 352         __u64                    dreq_isr;
 353         __u32                    dreq_service;
 354 };
 355
 356 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
 357 {
 358         return (struct dccp_request_sock *)req;
 359 }
 360
 361 extern struct inet_timewait_death_row dccp_death_row;
 362
 363 /* Read about the ECN nonce to see why it is 253 */
 364 #define DCCP_MAX_ACK_VECTOR_LEN 253
 365
 366 struct dccp_options_received {
 367         u32     dccpor_ndp:24,
 368                 dccpor_ack_vector_len:8;
 369         u32     dccpor_ack_vector_idx:10;
 370         /* 22 bits hole, try to pack */
 371         u32     dccpor_timestamp;
 372         u32     dccpor_timestamp_echo;
 373         u32     dccpor_elapsed_time;
 374 };
 375
 376 struct ccid;
 377
 378 enum dccp_role {
 379         DCCP_ROLE_UNDEFINED,
 380         DCCP_ROLE_LISTEN,
 381         DCCP_ROLE_CLIENT,
 382         DCCP_ROLE_SERVER,
 383 };
 384
 385 /**
 386  * struct dccp_sock - DCCP socket state
 387  *
 388  * @dccps_swl - sequence number window low
 389  * @dccps_swh - sequence number window high
 390  * @dccps_awl - acknowledgement number window low
 391  * @dccps_awh - acknowledgement number window high
 392  * @dccps_iss - initial sequence number sent
 393  * @dccps_isr - initial sequence number received
 394  * @dccps_osr - first OPEN sequence number received
 395  * @dccps_gss - greatest sequence number sent
 396  * @dccps_gsr - greatest valid sequence number received
 397  * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
 398  * @dccps_timestamp_time - time of latest TIMESTAMP option
 399  * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
 400  * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
 401  * @dccps_pmtu_cookie - Last pmtu seen by socket
 402  * @dccps_packet_size - Set thru setsockopt
 403  * @dccps_role - Role of this sock, one of %dccp_role
 404  * @dccps_ndp_count - number of Non Data Packets since last data packet
 405  * @dccps_hc_rx_ackpkts - receiver half connection acked packets
 406  */
 407 struct dccp_sock {
 408         /* inet_connection_sock has to be the first member of dccp_sock */
 409         struct inet_connection_sock     dccps_inet_connection;
 410         __u64                           dccps_swl;
 411         __u64                           dccps_swh;
 412         __u64                           dccps_awl;
 413         __u64                           dccps_awh;
 414         __u64                           dccps_iss;
 415         __u64                           dccps_isr;
 416         __u64                           dccps_osr;
 417         __u64                           dccps_gss;
 418         __u64                           dccps_gsr;
 419         __u64                           dccps_gar;
 420         unsigned long                   dccps_service;
 421         struct timeval                  dccps_timestamp_time;
 422         __u32                           dccps_timestamp_echo;
 423         __u32                           dccps_packet_size;
 424         unsigned long                   dccps_ndp_count;
 425         __u16                           dccps_ext_header_len;
 426         __u32                           dccps_pmtu_cookie;
 427         __u32                           dccps_mss_cache;
 428         struct dccp_options             dccps_options;
 429         struct dccp_ackpkts             *dccps_hc_rx_ackpkts;
 430         void                            *dccps_hc_rx_ccid_private;
 431         void                            *dccps_hc_tx_ccid_private;
 432         struct ccid                     *dccps_hc_rx_ccid;
 433         struct ccid                     *dccps_hc_tx_ccid;
 434         struct dccp_options_received    dccps_options_received;
 435         enum dccp_role                  dccps_role:2;
 436 };
 437
 438 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
 439 {
 440         return (struct dccp_sock *)sk;
 441 }
 442
 443 static inline const char *dccp_role(const struct sock *sk)
 444 {
 445         switch (dccp_sk(sk)->dccps_role) {
 446         case DCCP_ROLE_UNDEFINED: return "undefined";
 447         case DCCP_ROLE_LISTEN:    return "listen";
 448         case DCCP_ROLE_SERVER:    return "server";
 449         case DCCP_ROLE_CLIENT:    return "client";
 450         }
 451         return NULL;
 452 }
 453
 454 #endif /* __KERNEL__ */
 455
 456 #endif /* _LINUX_DCCP_H */