2 * Copyright (c) 2020 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef SRC_VNET_TCP_TCP_TYPES_H_
17 #define SRC_VNET_TCP_TCP_TYPES_H_
19 #include <vppinfra/clib.h>
20 #include <vppinfra/rbtree.h>
21 #include <vnet/tcp/tcp_packet.h>
22 #include <vnet/session/transport.h>
24 #define TCP_TICK 0.001 /**< TCP tick period (s) */
25 #define THZ (u32) (1/TCP_TICK) /**< TCP tick frequency */
26 #define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */
27 #define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
28 #define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
29 #define TCP_MAX_OPTION_SPACE 40
30 #define TCP_CC_DATA_SZ 24
31 #define TCP_MAX_GSO_SZ 65536
32 #define TCP_RXT_MAX_BURST 10
34 #define TCP_DUPACK_THRESHOLD 3
35 #define TCP_IW_N_SEGMENTS 10
36 #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */
37 #define TCP_USE_SACKS 1 /**< Disable only for testing */
39 /** TCP FSM state definitions as per RFC793. */
40 #define foreach_tcp_fsm_state \
43 _(SYN_SENT, "SYN_SENT") \
44 _(SYN_RCVD, "SYN_RCVD") \
45 _(ESTABLISHED, "ESTABLISHED") \
46 _(CLOSE_WAIT, "CLOSE_WAIT") \
47 _(FIN_WAIT_1, "FIN_WAIT_1") \
48 _(LAST_ACK, "LAST_ACK") \
49 _(CLOSING, "CLOSING") \
50 _(FIN_WAIT_2, "FIN_WAIT_2") \
51 _(TIME_WAIT, "TIME_WAIT")
53 typedef enum _tcp_state
55 #define _(sym, str) TCP_STATE_##sym,
62 #define foreach_tcp_timer \
63 _(RETRANSMIT, "RETRANSMIT") \
64 _(DELACK, "DELAYED ACK") \
65 _(PERSIST, "PERSIST") \
66 _(WAITCLOSE, "WAIT CLOSE") \
67 _(RETRANSMIT_SYN, "RETRANSMIT SYN") \
69 typedef enum _tcp_timers
71 #define _(sym, str) TCP_TIMER_##sym,
77 #define TCP_TIMER_HANDLE_INVALID ((u32) ~0)
79 #define TCP_TIMER_TICK 0.1 /**< Timer tick in seconds */
80 #define TCP_TO_TIMER_TICK TCP_TICK*10 /**< Factor for converting
81 ticks to timer ticks */
83 #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */
84 #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */
85 #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */
86 #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */
87 #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */
88 #define TCP_RTO_BOFF_MAX 8 /* Max number of retries before reset */
89 #define TCP_ESTABLISH_TIME (60 * THZ) /* Connection establish timeout */
91 /** Connection configuration flags */
92 #define foreach_tcp_cfg_flag \
93 _(RATE_SAMPLE, "Rate sampling") \
94 _(NO_CSUM_OFFLOAD, "No csum offload") \
95 _(NO_TSO, "TSO off") \
97 _(NO_ENDPOINT,"No endpoint") \
99 typedef enum tcp_cfg_flag_bits_
101 #define _(sym, str) TCP_CFG_F_##sym##_BIT,
105 } tcp_cfg_flag_bits_e;
107 typedef enum tcp_cfg_flag_
109 #define _(sym, str) TCP_CFG_F_##sym = 1 << TCP_CFG_F_##sym##_BIT,
115 /** TCP connection flags */
116 #define foreach_tcp_connection_flag \
117 _(SNDACK, "Send ACK") \
118 _(FINSNT, "FIN sent") \
119 _(RECOVERY, "Recovery") \
120 _(FAST_RECOVERY, "Fast Recovery") \
121 _(DCNT_PENDING, "Disconnect pending") \
122 _(HALF_OPEN_DONE, "Half-open completed") \
123 _(FINPNDG, "FIN pending") \
124 _(RXT_PENDING, "Retransmit pending") \
125 _(FRXT_FIRST, "Retransmit first") \
126 _(DEQ_PENDING, "Dequeue pending ") \
127 _(PSH_PENDING, "PSH pending") \
128 _(FINRCVD, "FIN received") \
129 _(ZERO_RWND_SENT, "Zero RWND sent") \
131 typedef enum tcp_connection_flag_bits_
133 #define _(sym, str) TCP_CONN_##sym##_BIT,
134 foreach_tcp_connection_flag
137 } tcp_connection_flag_bits_e;
139 typedef enum tcp_connection_flag_
141 #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT,
142 foreach_tcp_connection_flag
145 } tcp_connection_flags_e;
147 #define TCP_SCOREBOARD_TRACE (0)
148 #define TCP_MAX_SACK_BLOCKS 256 /**< Max number of SACK blocks stored */
149 #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0)
151 typedef struct _scoreboard_trace_elt
158 } scoreboard_trace_elt_t;
160 typedef struct _sack_scoreboard_hole
162 u32 next; /**< Index for next entry in linked list */
163 u32 prev; /**< Index for previous entry in linked list */
164 u32 start; /**< Start sequence number */
165 u32 end; /**< End sequence number */
166 u8 is_lost; /**< Mark hole as lost */
167 } sack_scoreboard_hole_t;
169 typedef struct _sack_scoreboard
171 sack_scoreboard_hole_t *holes; /**< Pool of holes */
172 u32 head; /**< Index of first entry */
173 u32 tail; /**< Index of last entry */
174 u32 sacked_bytes; /**< Number of bytes sacked in sb */
175 u32 last_sacked_bytes; /**< Number of bytes last sacked */
176 u32 last_bytes_delivered; /**< Sack bytes delivered to app */
177 u32 rxt_sacked; /**< Rxt bytes last delivered */
178 u32 high_sacked; /**< Highest byte sacked (fack) */
179 u32 high_rxt; /**< Highest retransmitted sequence */
180 u32 rescue_rxt; /**< Rescue sequence number */
181 u32 lost_bytes; /**< Bytes lost as per RFC6675 */
182 u32 last_lost_bytes; /**< Number of bytes last lost */
183 u32 cur_rxt_hole; /**< Retransmitting from this hole */
186 #if TCP_SCOREBOARD_TRACE
187 scoreboard_trace_elt_t *trace;
192 #define TCP_BTS_INVALID_INDEX ((u32)~0)
194 typedef enum tcp_bts_flags_
197 TCP_BTS_IS_APP_LIMITED = 1 << 1,
198 TCP_BTS_IS_SACKED = 1 << 2,
199 TCP_BTS_IS_RXT_LOST = 1 << 3,
200 } __clib_packed tcp_bts_flags_t;
202 typedef struct tcp_bt_sample_
204 u32 next; /**< Next sample index in list */
205 u32 prev; /**< Previous sample index in list */
206 u32 min_seq; /**< Min seq number in sample */
207 u32 max_seq; /**< Max seq number. Set for rxt samples */
208 u64 delivered; /**< Total delivered bytes for sample */
209 f64 delivered_time; /**< Delivered time when sample taken */
210 f64 tx_time; /**< Transmit time for the burst */
211 f64 first_tx_time; /**< Connection first tx time at tx */
212 u64 tx_in_flight; /**< In flight at tx time */
213 u64 tx_lost; /**< Lost at tx time */
214 tcp_bts_flags_t flags; /**< Sample flag */
217 typedef struct tcp_rate_sample_
219 u64 prior_delivered; /**< Delivered of sample used for rate, i.e.,
220 total bytes delivered at prior_time */
221 f64 prior_time; /**< Delivered time of sample used for rate */
222 f64 interval_time; /**< Time to ack the bytes delivered */
223 f64 rtt_time; /**< RTT for sample */
224 u64 tx_in_flight; /**< In flight at (re)transmit time */
225 u64 tx_lost; /**< Lost over interval */
226 u32 delivered; /**< Bytes delivered in interval_time */
227 u32 acked_and_sacked; /**< Bytes acked + sacked now */
228 u32 last_lost; /**< Bytes lost now */
229 u32 lost; /**< Number of bytes lost over interval */
230 tcp_bts_flags_t flags; /**< Rate sample flags from bt sample */
233 typedef struct tcp_byte_tracker_
235 tcp_bt_sample_t *samples; /**< Pool of samples */
236 rb_tree_t sample_lookup; /**< Rbtree for sample lookup by min_seq */
237 u32 head; /**< Head of samples linked list */
238 u32 tail; /**< Tail of samples linked list */
239 u32 last_ooo; /**< Cached last ooo sample */
240 } tcp_byte_tracker_t;
242 typedef enum _tcp_cc_algorithm_type
246 TCP_CC_LAST = TCP_CC_CUBIC
247 } tcp_cc_algorithm_type_e;
249 typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t;
251 typedef enum _tcp_cc_ack_t
258 typedef enum tcp_cc_event_
264 * As per RFC4898 tcpEStatsStackSoftErrors
266 typedef struct tcp_errors_
268 u32 below_data_wnd; /**< All data in seg is below snd_una */
269 u32 above_data_wnd; /**< Some data in segment is above snd_wnd */
270 u32 below_ack_wnd; /**< Acks for data below snd_una */
271 u32 above_ack_wnd; /**< Acks for data not sent */
274 typedef struct _tcp_connection
276 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
277 transport_connection_t connection; /**< Common transport data. First! */
279 u8 state; /**< TCP state as per tcp_state_t */
280 u8 cfg_flags; /**< Connection configuration flags */
281 u16 flags; /**< Connection flags (see tcp_conn_flags_e) */
282 u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */
284 u64 segs_in; /** RFC4022/4898 tcpHCInSegs/tcpEStatsPerfSegsIn */
285 u64 bytes_in; /** RFC4898 tcpEStatsPerfHCDataOctetsIn */
286 u64 segs_out; /** RFC4898 tcpEStatsPerfSegsOut */
287 u64 bytes_out; /** RFC4898 tcpEStatsPerfHCDataOctetsOut */
289 /** Send sequence variables RFC793 */
290 u32 snd_una; /**< oldest unacknowledged sequence number */
291 u32 snd_una_max; /**< newest unacknowledged sequence number + 1*/
292 u32 snd_wnd; /**< send window */
293 u32 snd_wl1; /**< seq number used for last snd.wnd update */
294 u32 snd_wl2; /**< ack number used for last snd.wnd update */
295 u32 snd_nxt; /**< next seq number to be sent */
296 u16 snd_mss; /**< Effective send max seg (data) size */
298 u64 data_segs_in; /** RFC4898 tcpEStatsPerfDataSegsIn */
299 u64 data_segs_out; /** RFC4898 tcpEStatsPerfDataSegsOut */
301 /** Receive sequence variables RFC793 */
302 u32 rcv_nxt; /**< next sequence number expected */
303 u32 rcv_wnd; /**< receive window we expect */
305 u32 rcv_las; /**< rcv_nxt at last ack sent/rcv_wnd update */
306 u32 iss; /**< initial sent sequence */
307 u32 irs; /**< initial remote sequence */
310 u8 snd_opts_len; /**< Tx options len */
311 u8 rcv_wscale; /**< Window scale to advertise to peer */
312 u8 snd_wscale; /**< Window scale to use when sending */
313 u32 tsval_recent; /**< Last timestamp received */
314 u32 tsval_recent_age; /**< When last updated tstamp_recent*/
315 tcp_options_t snd_opts; /**< Tx options for connection */
316 tcp_options_t rcv_opts; /**< Rx options for connection */
318 sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */
319 u8 snd_sack_pos; /**< Position in vec of first block to send */
320 sack_block_t *snd_sacks_fl; /**< Vector for building new list */
321 sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */
323 u16 rcv_dupacks; /**< Number of recent DUPACKs received */
324 u32 dupacks_in; /**< RFC4898 tcpEStatsStackDupAcksIn*/
325 u8 pending_dupacks; /**< Number of DUPACKs to be sent */
326 u32 dupacks_out; /**< RFC4898 tcpEStatsPathDupAcksOut */
328 /* Congestion control */
329 u32 cwnd; /**< Congestion window */
330 u32 cwnd_acc_bytes; /**< Bytes accumulated for cwnd increment */
331 u32 ssthresh; /**< Slow-start threshold */
332 u32 prev_ssthresh; /**< ssthresh before congestion */
333 u32 prev_cwnd; /**< ssthresh before congestion */
334 u32 bytes_acked; /**< Bytes acknowledged by current segment */
335 u32 burst_acked; /**< Bytes acknowledged in current burst */
336 u32 snd_rxt_bytes; /**< Retransmitted bytes during current cc event */
337 u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */
338 u32 prr_delivered; /**< RFC6937 bytes delivered during current event */
339 u32 prr_start; /**< snd_una when prr starts */
340 u32 rxt_delivered; /**< Rxt bytes delivered during current cc event */
341 u32 rxt_head; /**< snd_una last time we re rxted the head */
342 u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */
343 u32 snd_congestion; /**< snd_una_max when congestion is detected */
344 u32 tx_fifo_size; /**< Tx fifo size. Used to constrain cwnd */
345 tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */
346 u8 cc_data[TCP_CC_DATA_SZ]; /**< Congestion control algo private data */
348 u32 fr_occurences; /**< fast-retransmit occurrences RFC4898
349 tcpEStatsStackFastRetran */
350 u32 tr_occurences; /**< timer-retransmit occurrences */
351 u64 bytes_retrans; /**< RFC4898 tcpEStatsPerfOctetsRetrans */
352 u64 segs_retrans; /**< RFC4898 tcpEStatsPerfSegsRetrans*/
355 u32 rto; /**< Retransmission timeout */
356 u32 rto_boff; /**< Index for RTO backoff */
357 u32 srtt; /**< Smoothed RTT */
358 u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */
359 u32 rtt_seq; /**< Sequence number for tracked ACK */
360 f64 rtt_ts; /**< Timestamp for tracked ACK */
361 f64 mrtt_us; /**< High precision mrtt from tracked acks */
363 u32 psh_seq; /**< Add psh header for seg that includes this */
364 u32 next_node_index; /**< Can be used to control next node in output */
365 u32 next_node_opaque; /**< Opaque to pass to next node */
366 u32 limited_transmit; /**< snd_nxt when limited transmit starts */
367 u32 sw_if_index; /**< Interface for the connection */
369 /* Delivery rate estimation */
370 u64 delivered; /**< Total bytes delivered to peer */
371 u64 app_limited; /**< Delivered when app-limited detected */
372 f64 delivered_time; /**< Time last bytes were acked */
373 f64 first_tx_time; /**< Send time for recently delivered/sent */
374 u64 lost; /**< Total bytes lost */
375 tcp_byte_tracker_t *bt; /**< Tx byte tracker */
377 tcp_errors_t errors; /**< Soft connection errors */
379 f64 start_ts; /**< Timestamp when connection initialized */
380 u32 last_fib_check; /**< Last time we checked fib route for peer */
381 u16 mss; /**< Our max seg size that includes options */
382 u32 timestamp_delta; /**< Offset for timestamp */
383 u32 ipv6_flow_label; /**< flow label for ipv6 header */
385 #define rst_state snd_wl1
389 struct _tcp_cc_algorithm
392 uword (*unformat_cfg) (unformat_input_t * input);
393 void (*init) (tcp_connection_t * tc);
394 void (*cleanup) (tcp_connection_t * tc);
395 void (*rcv_ack) (tcp_connection_t * tc, tcp_rate_sample_t *rs);
396 void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack,
397 tcp_rate_sample_t *rs);
398 void (*congestion) (tcp_connection_t * tc);
399 void (*loss) (tcp_connection_t * tc);
400 void (*recovered) (tcp_connection_t * tc);
401 void (*undo_recovery) (tcp_connection_t * tc);
402 void (*event) (tcp_connection_t *tc, tcp_cc_event_t evt);
403 u64 (*get_pacing_rate) (tcp_connection_t *tc);
407 #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY
408 #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY
409 #define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY
410 #define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY
411 #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY)
412 #define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY))
413 #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh)
414 #define tcp_disconnect_pending(tc) ((tc)->flags & TCP_CONN_DCNT_PENDING)
415 #define tcp_disconnect_pending_on(tc) ((tc)->flags |= TCP_CONN_DCNT_PENDING)
416 #define tcp_disconnect_pending_off(tc) ((tc)->flags &= ~TCP_CONN_DCNT_PENDING)
417 #define tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST)
418 #define tcp_fastrecovery_first_on(tc) ((tc)->flags |= TCP_CONN_FRXT_FIRST)
419 #define tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST)
421 #define tcp_in_cong_recovery(tc) ((tc)->flags & \
422 (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY))
425 tcp_cong_recovery_off (tcp_connection_t * tc)
427 tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY);
428 tcp_fastrecovery_first_off (tc);
431 #define tcp_csum_offload(tc) (!((tc)->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD))
433 #define tcp_zero_rwnd_sent(tc) ((tc)->flags & TCP_CONN_ZERO_RWND_SENT)
434 #define tcp_zero_rwnd_sent_on(tc) (tc)->flags |= TCP_CONN_ZERO_RWND_SENT
435 #define tcp_zero_rwnd_sent_off(tc) (tc)->flags &= ~TCP_CONN_ZERO_RWND_SENT
437 always_inline tcp_connection_t *
438 tcp_get_connection_from_transport (transport_connection_t * tconn)
440 return (tcp_connection_t *) tconn;
443 #endif /* SRC_VNET_TCP_TCP_TYPES_H_ */
446 * fd.io coding-style-patch-verification: ON
449 * eval: (c-set-style "gnu")