Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame^] | 1 | #ifndef _LINUX_DCCP_H |
| 2 | #define _LINUX_DCCP_H |
| 3 | |
| 4 | #include <linux/in.h> |
| 5 | #include <linux/list.h> |
| 6 | #include <linux/types.h> |
| 7 | #include <linux/uio.h> |
| 8 | #include <linux/workqueue.h> |
| 9 | |
| 10 | #include <net/inet_connection_sock.h> |
| 11 | #include <net/sock.h> |
| 12 | #include <net/tcp_states.h> |
| 13 | #include <net/tcp.h> |
| 14 | |
| 15 | /* FIXME: this is utterly wrong */ |
| 16 | struct sockaddr_dccp { |
| 17 | struct sockaddr_in in; |
| 18 | unsigned int service; |
| 19 | }; |
| 20 | |
| 21 | enum dccp_state { |
| 22 | DCCP_OPEN = TCP_ESTABLISHED, |
| 23 | DCCP_REQUESTING = TCP_SYN_SENT, |
| 24 | DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: |
| 25 | This mapping is horrible, but TCP has |
| 26 | no matching state for DCCP_PARTOPEN, |
| 27 | as TCP_SYN_RECV is already used by |
| 28 | DCCP_RESPOND, why don't stop using TCP |
| 29 | mapping of states? OK, now we don't use |
| 30 | sk_stream_sendmsg anymore, so doesn't |
| 31 | seem to exist any reason for us to |
| 32 | do the TCP mapping here */ |
| 33 | DCCP_LISTEN = TCP_LISTEN, |
| 34 | DCCP_RESPOND = TCP_SYN_RECV, |
| 35 | DCCP_CLOSING = TCP_CLOSING, |
| 36 | DCCP_TIME_WAIT = TCP_TIME_WAIT, |
| 37 | DCCP_CLOSED = TCP_CLOSE, |
| 38 | DCCP_MAX_STATES = TCP_MAX_STATES, |
| 39 | }; |
| 40 | |
| 41 | #define DCCP_STATE_MASK 0xf |
| 42 | #define DCCP_ACTION_FIN (1<<7) |
| 43 | |
| 44 | enum { |
| 45 | DCCPF_OPEN = TCPF_ESTABLISHED, |
| 46 | DCCPF_REQUESTING = TCPF_SYN_SENT, |
| 47 | DCCPF_PARTOPEN = TCPF_FIN_WAIT1, |
| 48 | DCCPF_LISTEN = TCPF_LISTEN, |
| 49 | DCCPF_RESPOND = TCPF_SYN_RECV, |
| 50 | DCCPF_CLOSING = TCPF_CLOSING, |
| 51 | DCCPF_TIME_WAIT = TCPF_TIME_WAIT, |
| 52 | DCCPF_CLOSED = TCPF_CLOSE, |
| 53 | }; |
| 54 | |
| 55 | /** |
| 56 | * struct dccp_hdr - generic part of DCCP packet header |
| 57 | * |
| 58 | * @dccph_sport - Relevant port on the endpoint that sent this packet |
| 59 | * @dccph_dport - Relevant port on the other endpoint |
| 60 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words |
| 61 | * @dccph_ccval - Used by the HC-Sender CCID |
| 62 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field |
| 63 | * @dccph_checksum - Internet checksum, depends on dccph_cscov |
| 64 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 |
| 65 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros |
| 66 | * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x |
| 67 | */ |
| 68 | struct dccp_hdr { |
| 69 | __u16 dccph_sport, |
| 70 | dccph_dport; |
| 71 | __u8 dccph_doff; |
| 72 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 73 | __u8 dccph_cscov:4, |
| 74 | dccph_ccval:4; |
| 75 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 76 | __u8 dccph_ccval:4, |
| 77 | dccph_cscov:4; |
| 78 | #else |
| 79 | #error "Adjust your <asm/byteorder.h> defines" |
| 80 | #endif |
| 81 | __u16 dccph_checksum; |
| 82 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 83 | __u32 dccph_x:1, |
| 84 | dccph_type:4, |
| 85 | dccph_reserved:3, |
| 86 | dccph_seq:24; |
| 87 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 88 | __u32 dccph_reserved:3, |
| 89 | dccph_type:4, |
| 90 | dccph_x:1, |
| 91 | dccph_seq:24; |
| 92 | #else |
| 93 | #error "Adjust your <asm/byteorder.h> defines" |
| 94 | #endif |
| 95 | }; |
| 96 | |
| 97 | static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) |
| 98 | { |
| 99 | return (struct dccp_hdr *)skb->h.raw; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * struct dccp_hdr_ext - the low bits of a 48 bit seq packet |
| 104 | * |
| 105 | * @dccph_seq_low - low 24 bits of a 48 bit seq packet |
| 106 | */ |
| 107 | struct dccp_hdr_ext { |
| 108 | __u32 dccph_seq_low; |
| 109 | }; |
| 110 | |
| 111 | static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) |
| 112 | { |
| 113 | return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); |
| 114 | } |
| 115 | |
| 116 | static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) |
| 117 | { |
| 118 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 119 | return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); |
| 120 | } |
| 121 | |
| 122 | static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) |
| 123 | { |
| 124 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 125 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 126 | __u64 seq_nr = ntohl(dh->dccph_seq << 8); |
| 127 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 128 | __u64 seq_nr = ntohl(dh->dccph_seq); |
| 129 | #else |
| 130 | #error "Adjust your <asm/byteorder.h> defines" |
| 131 | #endif |
| 132 | |
| 133 | if (dh->dccph_x != 0) |
| 134 | seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); |
| 135 | |
| 136 | return seq_nr; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * struct dccp_hdr_request - Conection initiation request header |
| 141 | * |
| 142 | * @dccph_req_service - Service to which the client app wants to connect |
| 143 | * @dccph_req_options - list of options (must be a multiple of 32 bits |
| 144 | */ |
| 145 | struct dccp_hdr_request { |
| 146 | __u32 dccph_req_service; |
| 147 | }; |
| 148 | |
| 149 | static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) |
| 150 | { |
| 151 | return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets |
| 156 | * |
| 157 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR |
| 158 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR |
| 159 | */ |
| 160 | struct dccp_hdr_ack_bits { |
| 161 | __u32 dccph_reserved1:8, |
| 162 | dccph_ack_nr_high:24; |
| 163 | __u32 dccph_ack_nr_low; |
| 164 | }; |
| 165 | |
| 166 | static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) |
| 167 | { |
| 168 | return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); |
| 169 | } |
| 170 | |
| 171 | static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) |
| 172 | { |
| 173 | const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); |
| 174 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 175 | return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low); |
| 176 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 177 | return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low); |
| 178 | #else |
| 179 | #error "Adjust your <asm/byteorder.h> defines" |
| 180 | #endif |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * struct dccp_hdr_response - Conection initiation response header |
| 185 | * |
| 186 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR |
| 187 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR |
| 188 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request |
| 189 | * @dccph_resp_options - list of options (must be a multiple of 32 bits |
| 190 | */ |
| 191 | struct dccp_hdr_response { |
| 192 | struct dccp_hdr_ack_bits dccph_resp_ack; |
| 193 | __u32 dccph_resp_service; |
| 194 | }; |
| 195 | |
| 196 | static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) |
| 197 | { |
| 198 | return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * struct dccp_hdr_reset - Unconditionally shut down a connection |
| 203 | * |
| 204 | * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request |
| 205 | * @dccph_reset_options - list of options (must be a multiple of 32 bits |
| 206 | */ |
| 207 | struct dccp_hdr_reset { |
| 208 | struct dccp_hdr_ack_bits dccph_reset_ack; |
| 209 | __u8 dccph_reset_code, |
| 210 | dccph_reset_data[3]; |
| 211 | }; |
| 212 | |
| 213 | static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) |
| 214 | { |
| 215 | return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); |
| 216 | } |
| 217 | |
| 218 | enum dccp_pkt_type { |
| 219 | DCCP_PKT_REQUEST = 0, |
| 220 | DCCP_PKT_RESPONSE, |
| 221 | DCCP_PKT_DATA, |
| 222 | DCCP_PKT_ACK, |
| 223 | DCCP_PKT_DATAACK, |
| 224 | DCCP_PKT_CLOSEREQ, |
| 225 | DCCP_PKT_CLOSE, |
| 226 | DCCP_PKT_RESET, |
| 227 | DCCP_PKT_SYNC, |
| 228 | DCCP_PKT_SYNCACK, |
| 229 | DCCP_PKT_INVALID, |
| 230 | }; |
| 231 | |
| 232 | #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID |
| 233 | |
| 234 | static inline unsigned int dccp_packet_hdr_len(const __u8 type) |
| 235 | { |
| 236 | if (type == DCCP_PKT_DATA) |
| 237 | return 0; |
| 238 | if (type == DCCP_PKT_DATAACK || |
| 239 | type == DCCP_PKT_ACK || |
| 240 | type == DCCP_PKT_SYNC || |
| 241 | type == DCCP_PKT_SYNCACK || |
| 242 | type == DCCP_PKT_CLOSE || |
| 243 | type == DCCP_PKT_CLOSEREQ) |
| 244 | return sizeof(struct dccp_hdr_ack_bits); |
| 245 | if (type == DCCP_PKT_REQUEST) |
| 246 | return sizeof(struct dccp_hdr_request); |
| 247 | if (type == DCCP_PKT_RESPONSE) |
| 248 | return sizeof(struct dccp_hdr_response); |
| 249 | return sizeof(struct dccp_hdr_reset); |
| 250 | } |
| 251 | |
| 252 | static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) |
| 253 | { |
| 254 | return dccp_basic_hdr_len(skb) + |
| 255 | dccp_packet_hdr_len(dccp_hdr(skb)->dccph_type); |
| 256 | } |
| 257 | |
| 258 | enum dccp_reset_codes { |
| 259 | DCCP_RESET_CODE_UNSPECIFIED = 0, |
| 260 | DCCP_RESET_CODE_CLOSED, |
| 261 | DCCP_RESET_CODE_ABORTED, |
| 262 | DCCP_RESET_CODE_NO_CONNECTION, |
| 263 | DCCP_RESET_CODE_PACKET_ERROR, |
| 264 | DCCP_RESET_CODE_OPTION_ERROR, |
| 265 | DCCP_RESET_CODE_MANDATORY_ERROR, |
| 266 | DCCP_RESET_CODE_CONNECTION_REFUSED, |
| 267 | DCCP_RESET_CODE_BAD_SERVICE_CODE, |
| 268 | DCCP_RESET_CODE_TOO_BUSY, |
| 269 | DCCP_RESET_CODE_BAD_INIT_COOKIE, |
| 270 | DCCP_RESET_CODE_AGGRESSION_PENALTY, |
| 271 | }; |
| 272 | |
| 273 | /* DCCP options */ |
| 274 | enum { |
| 275 | DCCPO_PADDING = 0, |
| 276 | DCCPO_MANDATORY = 1, |
| 277 | DCCPO_MIN_RESERVED = 3, |
| 278 | DCCPO_MAX_RESERVED = 31, |
| 279 | DCCPO_NDP_COUNT = 37, |
| 280 | DCCPO_ACK_VECTOR_0 = 38, |
| 281 | DCCPO_ACK_VECTOR_1 = 39, |
| 282 | DCCPO_TIMESTAMP = 41, |
| 283 | DCCPO_TIMESTAMP_ECHO = 42, |
| 284 | DCCPO_ELAPSED_TIME = 43, |
| 285 | DCCPO_MAX = 45, |
| 286 | DCCPO_MIN_CCID_SPECIFIC = 128, |
| 287 | DCCPO_MAX_CCID_SPECIFIC = 255, |
| 288 | }; |
| 289 | |
| 290 | /* DCCP features */ |
| 291 | enum { |
| 292 | DCCPF_RESERVED = 0, |
| 293 | DCCPF_SEQUENCE_WINDOW = 3, |
| 294 | DCCPF_SEND_ACK_VECTOR = 6, |
| 295 | DCCPF_SEND_NDP_COUNT = 7, |
| 296 | /* 10-127 reserved */ |
| 297 | DCCPF_MIN_CCID_SPECIFIC = 128, |
| 298 | DCCPF_MAX_CCID_SPECIFIC = 255, |
| 299 | }; |
| 300 | |
| 301 | /* initial values for each feature */ |
| 302 | #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 |
| 303 | /* FIXME: for now we're using CCID 3 (TFRC) */ |
| 304 | #define DCCPF_INITIAL_CCID 3 |
| 305 | #define DCCPF_INITIAL_SEND_ACK_VECTOR 0 |
| 306 | /* FIXME: for now we're default to 1 but it should really be 0 */ |
| 307 | #define DCCPF_INITIAL_SEND_NDP_COUNT 1 |
| 308 | |
| 309 | #define DCCP_NDP_LIMIT 0xFFFFFF |
| 310 | |
| 311 | /** |
| 312 | * struct dccp_options - option values for a DCCP connection |
| 313 | * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2) |
| 314 | * @dccpo_ccid - Congestion Control Id (CCID) (section 10) |
| 315 | * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5) |
| 316 | * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2) |
| 317 | */ |
| 318 | struct dccp_options { |
| 319 | __u64 dccpo_sequence_window; |
| 320 | __u8 dccpo_ccid; |
| 321 | __u8 dccpo_send_ack_vector; |
| 322 | __u8 dccpo_send_ndp_count; |
| 323 | }; |
| 324 | |
| 325 | extern void __dccp_options_init(struct dccp_options *dccpo); |
| 326 | extern void dccp_options_init(struct dccp_options *dccpo); |
| 327 | extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); |
| 328 | |
| 329 | struct dccp_request_sock { |
| 330 | struct inet_request_sock dreq_inet_rsk; |
| 331 | __u64 dreq_iss; |
| 332 | __u64 dreq_isr; |
| 333 | __u32 dreq_service; |
| 334 | }; |
| 335 | |
| 336 | static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) |
| 337 | { |
| 338 | return (struct dccp_request_sock *)req; |
| 339 | } |
| 340 | |
| 341 | /* Read about the ECN nonce to see why it is 253 */ |
| 342 | #define DCCP_MAX_ACK_VECTOR_LEN 253 |
| 343 | |
| 344 | struct dccp_options_received { |
| 345 | u32 dccpor_ndp:24, |
| 346 | dccpor_ack_vector_len:8; |
| 347 | u32 dccpor_ack_vector_idx:10; |
| 348 | /* 22 bits hole, try to pack */ |
| 349 | u32 dccpor_timestamp; |
| 350 | u32 dccpor_timestamp_echo; |
| 351 | u32 dccpor_elapsed_time; |
| 352 | }; |
| 353 | |
| 354 | struct ccid; |
| 355 | |
| 356 | enum dccp_role { |
| 357 | DCCP_ROLE_UNDEFINED, |
| 358 | DCCP_ROLE_LISTEN, |
| 359 | DCCP_ROLE_CLIENT, |
| 360 | DCCP_ROLE_SERVER, |
| 361 | }; |
| 362 | |
| 363 | /** |
| 364 | * struct dccp_sock - DCCP socket state |
| 365 | * |
| 366 | * @dccps_swl - sequence number window low |
| 367 | * @dccps_swh - sequence number window high |
| 368 | * @dccps_awl - acknowledgement number window low |
| 369 | * @dccps_awh - acknowledgement number window high |
| 370 | * @dccps_iss - initial sequence number sent |
| 371 | * @dccps_isr - initial sequence number received |
| 372 | * @dccps_osr - first OPEN sequence number received |
| 373 | * @dccps_gss - greatest sequence number sent |
| 374 | * @dccps_gsr - greatest valid sequence number received |
| 375 | * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss |
| 376 | * @dccps_timestamp_time - time of latest TIMESTAMP option |
| 377 | * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option |
| 378 | * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options) |
| 379 | * @dccps_pmtu_cookie - Last pmtu seen by socket |
| 380 | * @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it |
| 381 | * @dccps_role - Role of this sock, one of %dccp_role |
| 382 | * @dccps_ndp_count - number of Non Data Packets since last data packet |
| 383 | * @dccps_hc_rx_ackpkts - receiver half connection acked packets |
| 384 | */ |
| 385 | struct dccp_sock { |
| 386 | /* inet_connection_sock has to be the first member of dccp_sock */ |
| 387 | struct inet_connection_sock dccps_inet_connection; |
| 388 | __u64 dccps_swl; |
| 389 | __u64 dccps_swh; |
| 390 | __u64 dccps_awl; |
| 391 | __u64 dccps_awh; |
| 392 | __u64 dccps_iss; |
| 393 | __u64 dccps_isr; |
| 394 | __u64 dccps_osr; |
| 395 | __u64 dccps_gss; |
| 396 | __u64 dccps_gsr; |
| 397 | __u64 dccps_gar; |
| 398 | unsigned long dccps_service; |
| 399 | unsigned long dccps_timestamp_time; |
| 400 | __u32 dccps_timestamp_echo; |
| 401 | __u32 dccps_avg_packet_size; |
| 402 | unsigned long dccps_ndp_count; |
| 403 | __u16 dccps_ext_header_len; |
| 404 | __u32 dccps_pmtu_cookie; |
| 405 | __u32 dccps_mss_cache; |
| 406 | struct dccp_options dccps_options; |
| 407 | struct dccp_ackpkts *dccps_hc_rx_ackpkts; |
| 408 | void *dccps_hc_rx_ccid_private; |
| 409 | void *dccps_hc_tx_ccid_private; |
| 410 | struct ccid *dccps_hc_rx_ccid; |
| 411 | struct ccid *dccps_hc_tx_ccid; |
| 412 | struct dccp_options_received dccps_options_received; |
| 413 | enum dccp_role dccps_role:2; |
| 414 | }; |
| 415 | |
| 416 | static inline struct dccp_sock *dccp_sk(const struct sock *sk) |
| 417 | { |
| 418 | return (struct dccp_sock *)sk; |
| 419 | } |
| 420 | |
| 421 | static inline const char *dccp_role(const struct sock *sk) |
| 422 | { |
| 423 | switch (dccp_sk(sk)->dccps_role) { |
| 424 | case DCCP_ROLE_UNDEFINED: return "undefined"; |
| 425 | case DCCP_ROLE_LISTEN: return "listen"; |
| 426 | case DCCP_ROLE_SERVER: return "server"; |
| 427 | case DCCP_ROLE_CLIENT: return "client"; |
| 428 | } |
| 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | #endif /* _LINUX_DCCP_H */ |