1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
|
/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_RTB_H
#define NGTCP2_RTB_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_pkt.h"
#include "ngtcp2_ksl.h"
#include "ngtcp2_pq.h"
#include "ngtcp2_objalloc.h"
typedef struct ngtcp2_conn ngtcp2_conn;
typedef struct ngtcp2_pktns ngtcp2_pktns;
typedef struct ngtcp2_log ngtcp2_log;
typedef struct ngtcp2_qlog ngtcp2_qlog;
typedef struct ngtcp2_strm ngtcp2_strm;
typedef struct ngtcp2_rst ngtcp2_rst;
typedef struct ngtcp2_cc ngtcp2_cc;
/* NGTCP2_FRAME_CHAIN_BINDER_FLAG_NONE indicates that no flag is
set. */
#define NGTCP2_FRAME_CHAIN_BINDER_FLAG_NONE 0x00u
/* NGTCP2_FRAME_CHAIN_BINDER_FLAG_ACK indicates that an information
which a frame carries has been acknowledged. */
#define NGTCP2_FRAME_CHAIN_BINDER_FLAG_ACK 0x01u
/*
* ngtcp2_frame_chain_binder binds 2 or more of ngtcp2_frame_chain to
* share the acknowledgement state. In general, all
* ngtcp2_frame_chains bound to the same binder must have the same
* information.
*/
typedef struct ngtcp2_frame_chain_binder {
size_t refcount;
/* flags is bitwise OR of zero or more of
NGTCP2_FRAME_CHAIN_BINDER_FLAG_*. */
uint32_t flags;
} ngtcp2_frame_chain_binder;
int ngtcp2_frame_chain_binder_new(ngtcp2_frame_chain_binder **pbinder,
const ngtcp2_mem *mem);
typedef struct ngtcp2_frame_chain ngtcp2_frame_chain;
/*
* ngtcp2_frame_chain chains frames in a single packet.
*/
struct ngtcp2_frame_chain {
union {
struct {
ngtcp2_frame_chain *next;
ngtcp2_frame_chain_binder *binder;
ngtcp2_frame fr;
};
ngtcp2_opl_entry oplent;
};
};
ngtcp2_objalloc_def(frame_chain, ngtcp2_frame_chain, oplent);
/*
* ngtcp2_bind_frame_chains binds two frame chains |a| and |b| using
* new or existing ngtcp2_frame_chain_binder. |a| might have non-NULL
* a->binder. |b| must not have non-NULL b->binder.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory
*/
int ngtcp2_bind_frame_chains(ngtcp2_frame_chain *a, ngtcp2_frame_chain *b,
const ngtcp2_mem *mem);
/* NGTCP2_MAX_STREAM_DATACNT is the maximum number of ngtcp2_vec that
a ngtcp2_stream can include. */
#define NGTCP2_MAX_STREAM_DATACNT 256
/* NGTCP2_MAX_CRYPTO_DATACNT is the maximum number of ngtcp2_vec that
a ngtcp2_crypto can include. */
#define NGTCP2_MAX_CRYPTO_DATACNT 8
/*
* ngtcp2_frame_chain_new allocates ngtcp2_frame_chain object and
* assigns its pointer to |*pfrc|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory.
*/
int ngtcp2_frame_chain_new(ngtcp2_frame_chain **pfrc, const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_objalloc_new behaves like
* ngtcp2_frame_chain_new, but it uses |objalloc| to allocate the object.
*/
int ngtcp2_frame_chain_objalloc_new(ngtcp2_frame_chain **pfrc,
ngtcp2_objalloc *objalloc);
/*
* ngtcp2_frame_chain_extralen_new works like ngtcp2_frame_chain_new,
* but it allocates extra memory |extralen| in order to extend
* ngtcp2_frame.
*/
int ngtcp2_frame_chain_extralen_new(ngtcp2_frame_chain **pfrc, size_t extralen,
const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_stream_datacnt_objalloc_new works like
* ngtcp2_frame_chain_new, but it allocates enough data to store
* additional |datacnt| - 1 ngtcp2_vec object after ngtcp2_stream
* object. If no additional space is required,
* ngtcp2_frame_chain_objalloc_new is called internally.
*/
int ngtcp2_frame_chain_stream_datacnt_objalloc_new(ngtcp2_frame_chain **pfrc,
size_t datacnt,
ngtcp2_objalloc *objalloc,
const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_crypto_datacnt_objalloc_new works like
* ngtcp2_frame_chain_new, but it allocates enough data to store
* additional |datacnt| - 1 ngtcp2_vec object after ngtcp2_crypto
* object. If no additional space is required,
* ngtcp2_frame_chain_objalloc_new is called internally.
*/
int ngtcp2_frame_chain_crypto_datacnt_objalloc_new(ngtcp2_frame_chain **pfrc,
size_t datacnt,
ngtcp2_objalloc *objalloc,
const ngtcp2_mem *mem);
int ngtcp2_frame_chain_new_token_objalloc_new(ngtcp2_frame_chain **pfrc,
const ngtcp2_vec *token,
ngtcp2_objalloc *objalloc,
const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_del deallocates |frc|. It also deallocates the
* memory pointed by |frc|.
*/
void ngtcp2_frame_chain_del(ngtcp2_frame_chain *frc, const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_objalloc_del adds |frc| to |objalloc| for reuse.
* It might just delete |frc| depending on the frame type and the size
* of |frc|.
*/
void ngtcp2_frame_chain_objalloc_del(ngtcp2_frame_chain *frc,
ngtcp2_objalloc *objalloc,
const ngtcp2_mem *mem);
/*
* ngtcp2_frame_chain_init initializes |frc|.
*/
void ngtcp2_frame_chain_init(ngtcp2_frame_chain *frc);
/*
* ngtcp2_frame_chain_list_objalloc_del adds all ngtcp2_frame_chain
* linked from |frc| to |objalloc| for reuse. Depending on the frame type
* and its size, ngtcp2_frame_chain might be deleted instead.
*/
void ngtcp2_frame_chain_list_objalloc_del(ngtcp2_frame_chain *frc,
ngtcp2_objalloc *objalloc,
const ngtcp2_mem *mem);
/* NGTCP2_RTB_ENTRY_FLAG_NONE indicates that no flag is set. */
#define NGTCP2_RTB_ENTRY_FLAG_NONE 0x00u
/* NGTCP2_RTB_ENTRY_FLAG_PROBE indicates that the entry includes a
probe packet. */
#define NGTCP2_RTB_ENTRY_FLAG_PROBE 0x01u
/* NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE indicates that the entry
includes a frame which must be retransmitted until it is
acknowledged. In most cases, this flag is used along with
NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING and
NGTCP2_RTB_ENTRY_FLAG_PTO_ELICITING. */
#define NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE 0x02u
/* NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING indicates that the entry
elicits acknowledgement. */
#define NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING 0x04u
/* NGTCP2_RTB_ENTRY_FLAG_PTO_RECLAIMED indicates that the packet has
been reclaimed on PTO. It is not marked lost yet and still
consumes congestion window. */
#define NGTCP2_RTB_ENTRY_FLAG_PTO_RECLAIMED 0x08u
/* NGTCP2_RTB_ENTRY_FLAG_LOST_RETRANSMITTED indicates that the entry
has been marked lost and, optionally, scheduled to retransmit. */
#define NGTCP2_RTB_ENTRY_FLAG_LOST_RETRANSMITTED 0x10u
/* NGTCP2_RTB_ENTRY_FLAG_ECN indicates that the entry is included in a
UDP datagram with ECN marking. */
#define NGTCP2_RTB_ENTRY_FLAG_ECN 0x20u
/* NGTCP2_RTB_ENTRY_FLAG_DATAGRAM indicates that the entry includes
DATAGRAM frame. */
#define NGTCP2_RTB_ENTRY_FLAG_DATAGRAM 0x40u
/* NGTCP2_RTB_ENTRY_FLAG_PMTUD_PROBE indicates that the entry includes
a PMTUD probe packet. */
#define NGTCP2_RTB_ENTRY_FLAG_PMTUD_PROBE 0x80u
/* NGTCP2_RTB_ENTRY_FLAG_PTO_ELICITING indicates that the entry
includes a packet which elicits PTO probe packets. */
#define NGTCP2_RTB_ENTRY_FLAG_PTO_ELICITING 0x100u
typedef struct ngtcp2_rtb_entry ngtcp2_rtb_entry;
/*
* ngtcp2_rtb_entry is an object stored in ngtcp2_rtb. It corresponds
* to the one packet which is waiting for its ACK.
*/
struct ngtcp2_rtb_entry {
union {
struct {
ngtcp2_rtb_entry *next;
struct {
int64_t pkt_num;
uint8_t type;
uint8_t flags;
} hd;
ngtcp2_frame_chain *frc;
/* ts is the time point when a packet included in this entry is sent
to a peer. */
ngtcp2_tstamp ts;
/* lost_ts is the time when this entry is marked lost. */
ngtcp2_tstamp lost_ts;
/* pktlen is the length of QUIC packet */
size_t pktlen;
struct {
uint64_t delivered;
ngtcp2_tstamp delivered_ts;
ngtcp2_tstamp first_sent_ts;
uint64_t tx_in_flight;
uint64_t lost;
int is_app_limited;
} rst;
/* flags is bitwise-OR of zero or more of
NGTCP2_RTB_ENTRY_FLAG_*. */
uint16_t flags;
};
ngtcp2_opl_entry oplent;
};
};
ngtcp2_objalloc_def(rtb_entry, ngtcp2_rtb_entry, oplent);
/*
* ngtcp2_rtb_entry_new allocates ngtcp2_rtb_entry object, and assigns
* its pointer to |*pent|.
*/
int ngtcp2_rtb_entry_objalloc_new(ngtcp2_rtb_entry **pent,
const ngtcp2_pkt_hd *hd,
ngtcp2_frame_chain *frc, ngtcp2_tstamp ts,
size_t pktlen, uint16_t flags,
ngtcp2_objalloc *objalloc);
/*
* ngtcp2_rtb_entry_objalloc_del adds |ent| to |objalloc| for reuse.
* ngtcp2_frame_chain linked from ent->frc are also added to
* |frc_objalloc| depending on their frame type and size.
*/
void ngtcp2_rtb_entry_objalloc_del(ngtcp2_rtb_entry *ent,
ngtcp2_objalloc *objalloc,
ngtcp2_objalloc *frc_objalloc,
const ngtcp2_mem *mem);
/*
* ngtcp2_rtb tracks sent packets, and its ACK timeout for
* retransmission.
*/
typedef struct ngtcp2_rtb {
ngtcp2_objalloc *frc_objalloc;
ngtcp2_objalloc *rtb_entry_objalloc;
/* ents includes ngtcp2_rtb_entry sorted by decreasing order of
packet number. */
ngtcp2_ksl ents;
/* crypto is CRYPTO stream. */
ngtcp2_strm *crypto;
ngtcp2_rst *rst;
ngtcp2_cc *cc;
ngtcp2_log *log;
ngtcp2_qlog *qlog;
const ngtcp2_mem *mem;
/* largest_acked_tx_pkt_num is the largest packet number
acknowledged by the peer. */
int64_t largest_acked_tx_pkt_num;
/* num_ack_eliciting is the number of ACK eliciting entries. */
size_t num_ack_eliciting;
/* num_retransmittable is the number of packets which contain frames
that must be retransmitted on loss. */
size_t num_retransmittable;
/* num_pto_eliciting is the number of packets that elicit PTO probe
packets. */
size_t num_pto_eliciting;
/* probe_pkt_left is the number of probe packet to send */
size_t probe_pkt_left;
/* pktns_id is the identifier of packet number space. */
ngtcp2_pktns_id pktns_id;
/* cc_pkt_num is the smallest packet number that is contributed to
ngtcp2_conn_stat.bytes_in_flight. */
int64_t cc_pkt_num;
/* cc_bytes_in_flight is the number of in-flight bytes that is
contributed to ngtcp2_conn_stat.bytes_in_flight. It only
includes the bytes after congestion state is reset. */
uint64_t cc_bytes_in_flight;
/* persistent_congestion_start_ts is the time when persistent
congestion evaluation is started. It happens roughly after
handshake is confirmed. */
ngtcp2_tstamp persistent_congestion_start_ts;
/* num_lost_pkts is the number entries in ents which has
NGTCP2_RTB_ENTRY_FLAG_LOST_RETRANSMITTED flag set. */
size_t num_lost_pkts;
/* num_lost_pmtud_pkts is the number of entries in ents which have
both NGTCP2_RTB_ENTRY_FLAG_LOST_RETRANSMITTED and
NGTCP2_RTB_ENTRY_FLAG_PMTUD_PROBE flags set. */
size_t num_lost_pmtud_pkts;
} ngtcp2_rtb;
/*
* ngtcp2_rtb_init initializes |rtb|.
*/
void ngtcp2_rtb_init(ngtcp2_rtb *rtb, ngtcp2_pktns_id pktns_id,
ngtcp2_strm *crypto, ngtcp2_rst *rst, ngtcp2_cc *cc,
ngtcp2_log *log, ngtcp2_qlog *qlog,
ngtcp2_objalloc *rtb_entry_objalloc,
ngtcp2_objalloc *frc_objalloc, const ngtcp2_mem *mem);
/*
* ngtcp2_rtb_free deallocates resources allocated for |rtb|.
*/
void ngtcp2_rtb_free(ngtcp2_rtb *rtb);
/*
* ngtcp2_rtb_add adds |ent| to |rtb|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory
*/
int ngtcp2_rtb_add(ngtcp2_rtb *rtb, ngtcp2_rtb_entry *ent,
ngtcp2_conn_stat *cstat);
/*
* ngtcp2_rtb_head returns the iterator which points to the entry
* which has the largest packet number. If there is no entry,
* returned value satisfies ngtcp2_ksl_it_end(&it) != 0.
*/
ngtcp2_ksl_it ngtcp2_rtb_head(ngtcp2_rtb *rtb);
/*
* ngtcp2_rtb_recv_ack removes acked ngtcp2_rtb_entry from |rtb|.
* |pkt_num| is a packet number which includes |fr|. |pkt_ts| is the
* timestamp when packet is received. |ts| should be the current
* time. Usually they are the same, but for buffered packets,
* |pkt_ts| would be earlier than |ts|.
*
* This function returns the number of newly acknowledged packets if
* it succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_CALLBACK_FAILURE
* User callback failed
* NGTCP2_ERR_NOMEM
* Out of memory
*/
ngtcp2_ssize ngtcp2_rtb_recv_ack(ngtcp2_rtb *rtb, const ngtcp2_ack *fr,
ngtcp2_conn_stat *cstat, ngtcp2_conn *conn,
ngtcp2_pktns *pktns, ngtcp2_tstamp pkt_ts,
ngtcp2_tstamp ts);
/*
* ngtcp2_rtb_detect_lost_pkt detects lost packets and prepends the
* frames contained them to |*pfrc|. Even when this function fails,
* some frames might be prepended to |*pfrc| and the caller should
* handle them.
*/
int ngtcp2_rtb_detect_lost_pkt(ngtcp2_rtb *rtb, ngtcp2_conn *conn,
ngtcp2_pktns *pktns, ngtcp2_conn_stat *cstat,
ngtcp2_tstamp ts);
/*
* ngtcp2_rtb_remove_expired_lost_pkt removes expired lost packet.
*/
void ngtcp2_rtb_remove_expired_lost_pkt(ngtcp2_rtb *rtb, ngtcp2_duration pto,
ngtcp2_tstamp ts);
/*
* ngtcp2_rtb_lost_pkt_ts returns the earliest time when the still
* retained packet was lost. It returns UINT64_MAX if no such packet
* exists.
*/
ngtcp2_tstamp ngtcp2_rtb_lost_pkt_ts(ngtcp2_rtb *rtb);
/*
* ngtcp2_rtb_remove_all removes all packets from |rtb| and prepends
* all frames to |*pfrc|. Even when this function fails, some frames
* might be prepended to |*pfrc| and the caller should handle them.
*/
int ngtcp2_rtb_remove_all(ngtcp2_rtb *rtb, ngtcp2_conn *conn,
ngtcp2_pktns *pktns, ngtcp2_conn_stat *cstat);
/*
* ngtcp2_rtb_remove_early_data removes all entries for 0RTT packets.
*/
void ngtcp2_rtb_remove_early_data(ngtcp2_rtb *rtb, ngtcp2_conn_stat *cstat);
/*
* ngtcp2_rtb_empty returns nonzero if |rtb| have no entry.
*/
int ngtcp2_rtb_empty(ngtcp2_rtb *rtb);
/*
* ngtcp2_rtb_reset_cc_state resets congestion state in |rtb|.
* |cc_pkt_num| is the next outbound packet number which is sent under
* new congestion state.
*/
void ngtcp2_rtb_reset_cc_state(ngtcp2_rtb *rtb, int64_t cc_pkt_num);
/*
* ngtcp2_rtb_remove_expired_lost_pkt ensures that the number of lost
* packets at most |n|.
*/
void ngtcp2_rtb_remove_excessive_lost_pkt(ngtcp2_rtb *rtb, size_t n);
/*
* ngtcp2_rtb_reclaim_on_pto reclaims up to |num_pkts| packets which
* are in-flight and not marked lost to send them in PTO probe. The
* reclaimed frames are chained to |*pfrc|.
*
* This function returns the number of packets reclaimed if it
* succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory
*/
ngtcp2_ssize ngtcp2_rtb_reclaim_on_pto(ngtcp2_rtb *rtb, ngtcp2_conn *conn,
ngtcp2_pktns *pktns, size_t num_pkts);
#endif /* NGTCP2_RTB_H */
|