2 * Copyright (c) 2016-2019 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.
19 #include <vnet/vnet.h>
20 #include <vnet/ip/ip.h>
21 #include <vnet/session/session.h>
22 #include <vnet/tcp/tcp_types.h>
23 #include <vnet/tcp/tcp_timer.h>
24 #include <vnet/tcp/tcp_debug.h>
25 #include <vnet/tcp/tcp_sack.h>
26 #include <vnet/tcp/tcp_bt.h>
27 #include <vnet/tcp/tcp_cc.h>
29 typedef void (timer_expiration_handler) (tcp_connection_t * tc);
31 extern timer_expiration_handler tcp_timer_delack_handler;
32 extern timer_expiration_handler tcp_timer_retransmit_handler;
33 extern timer_expiration_handler tcp_timer_persist_handler;
34 extern timer_expiration_handler tcp_timer_retransmit_syn_handler;
36 typedef enum _tcp_error
38 #define tcp_error(n,s) TCP_ERROR_##n,
39 #include <vnet/tcp/tcp_error.def>
44 typedef struct _tcp_lookup_dispatch
47 } tcp_lookup_dispatch_t;
49 #define foreach_tcp_wrk_stat \
50 _(timer_expirations, u64, "timer expirations") \
51 _(rxt_segs, u64, "segments retransmitted") \
52 _(tr_events, u32, "timer retransmit events") \
53 _(to_closewait, u32, "timeout close-wait") \
54 _(to_closewait2, u32, "timeout close-wait w/data") \
55 _(to_finwait1, u32, "timeout fin-wait-1") \
56 _(to_finwait2, u32, "timeout fin-wait-2") \
57 _(to_lastack, u32, "timeout last-ack") \
58 _(to_closing, u32, "timeout closing") \
59 _(tr_abort, u32, "timer retransmit abort") \
60 _(rst_unread, u32, "reset on close due to unread data") \
62 typedef struct tcp_wrk_stats_
64 #define _(name, type, str) type name;
69 typedef struct tcp_free_req_
71 clib_time_type_t free_time;
75 typedef struct tcp_worker_ctx_
77 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
79 /** worker's pool of connections */
80 tcp_connection_t *connections;
82 /** vector of pending ack dequeues */
83 u32 *pending_deq_acked;
85 /** vector of pending disconnect notifications */
86 u32 *pending_disconnects;
88 /** vector of pending reset notifications */
91 /** convenience pointer to this thread's vlib main */
97 /* Max timers to be handled per dispatch loop */
98 u32 max_timers_per_loop;
100 /** Session layer edge indices to tcp output */
101 u32 tco_next_node[2];
103 /* Fifo of pending timer expirations */
106 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
108 /** cached 'on the wire' options for bursts */
111 /** tx buffer free list */
114 /* fifo of pending free requests */
115 tcp_cleanup_req_t *pending_cleanups;
117 /** worker timer wheel */
118 tw_timer_wheel_16t_2w_512sl_t timer_wheel;
120 CLIB_CACHE_LINE_ALIGN_MARK (cacheline2);
122 tcp_wrk_stats_t stats;
125 #define tcp_worker_stats_inc(_ti,_stat,_val) \
126 tcp_main.wrk_ctx[_ti].stats._stat += _val
128 #define tcp_workerp_stats_inc(_wrk,_stat,_val) \
129 _wrk->stats._stat += _val
131 typedef struct tcp_iss_seed_
137 typedef struct tcp_configuration_
139 /** Max rx fifo size for a session (in bytes). It is used in to compute the
140 * rfc 7323 window scaling factor */
143 /** Min rx fifo for a session (in bytes) */
146 /** Default MTU to be used when establishing connections */
149 /** Initial CWND multiplier, which multiplies MSS to determine initial CWND.
150 * Set 0 to determine the initial CWND by another way */
151 u16 initial_cwnd_multiplier;
153 /** Enable tx pacing for new connections */
156 /** Allow use of TSO whenever available */
159 /** Set if csum offloading is enabled */
162 /** Default congestion control algorithm type */
163 tcp_cc_algorithm_type_e cc_algo;
165 /** Min rwnd, as number of snd_mss segments, for update ack to be sent after
166 * a zero rwnd advertisement */
167 u32 rwnd_min_update_ack;
169 /** Delayed ack time (disabled) */
172 /** Timer ticks to wait for close from app */
175 /** Timer ticks to wait in time-wait. Also known as 2MSL */
178 /** Timer ticks to wait in fin-wait1 to send fin and rcv fin-ack */
181 /** Timer ticks to wait in last ack for ack */
184 /** Timer ticks to wait in fin-wait2 for fin */
187 /** Timer ticks to wait in closing for fin ack */
190 /** Time to wait (sec) before cleaning up the connection */
193 /** Number of preallocated connections */
194 u32 preallocated_connections;
196 /** Number of preallocated half-open connections */
197 u32 preallocated_half_open_connections;
199 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
200 ip4_address_t *ip4_src_addrs;
201 ip6_address_t *ip6_src_addrs;
203 /** Fault-injection. Debug only */
204 f64 buffer_fail_fraction;
205 } tcp_configuration_t;
207 typedef struct _tcp_main
209 /** per-worker context */
210 tcp_worker_ctx_t *wrk_ctx;
212 /* Pool of listeners. */
213 tcp_connection_t *listener_pool;
215 f64 tstamp_ticks_per_clock;
217 /** vlib buffer size */
218 u32 bytes_per_buffer;
220 /** Session layer edge indices to ip lookup (syns, rst) */
221 u32 ipl_next_node[2];
223 /** Dispatch table by state and flags */
224 tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64];
226 clib_spinlock_t half_open_lock;
228 /** Pool of half-open connections on which we've sent a SYN */
229 tcp_connection_t *half_open_connections;
231 /** Seed used to generate random iss */
232 tcp_iss_seed_t iss_seed;
234 /** Congestion control algorithms registered */
235 tcp_cc_algorithm_t *cc_algos;
237 /** Hash table of cc algorithms by name */
238 uword *cc_algo_by_name;
240 /** Last cc algo registered */
241 tcp_cc_algorithm_type_e cc_last_type;
243 /** Flag that indicates if stack is on or off */
246 /** Flag that indicates if v4 punting is enabled */
249 /** Flag that indicates if v6 punting is enabled */
252 /** Rotor for v4 source addresses */
253 u32 last_v4_addr_rotor;
255 /** Rotor for v6 source addresses */
256 u32 last_v6_addr_rotor;
258 /** Protocol configuration */
259 tcp_configuration_t cfg;
262 extern tcp_main_t tcp_main;
263 extern vlib_node_registration_t tcp4_input_node;
264 extern vlib_node_registration_t tcp6_input_node;
265 extern vlib_node_registration_t tcp4_output_node;
266 extern vlib_node_registration_t tcp6_output_node;
267 extern vlib_node_registration_t tcp4_established_node;
268 extern vlib_node_registration_t tcp6_established_node;
269 extern vlib_node_registration_t tcp4_syn_sent_node;
270 extern vlib_node_registration_t tcp6_syn_sent_node;
271 extern vlib_node_registration_t tcp4_rcv_process_node;
272 extern vlib_node_registration_t tcp6_rcv_process_node;
273 extern vlib_node_registration_t tcp4_listen_node;
274 extern vlib_node_registration_t tcp6_listen_node;
276 #define tcp_cfg tcp_main.cfg
277 #define tcp_node_index(node_id, is_ip4) \
278 ((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index)
280 always_inline tcp_main_t *
286 always_inline tcp_worker_ctx_t *
287 tcp_get_worker (u32 thread_index)
289 ASSERT (thread_index < vec_len (tcp_main.wrk_ctx));
290 return &tcp_main.wrk_ctx[thread_index];
293 #if (VLIB_BUFFER_TRACE_TRAJECTORY)
294 #define tcp_trajectory_add_start(b, start) \
296 (*vlib_buffer_trace_trajectory_cb) (b, start); \
299 #define tcp_trajectory_add_start(b, start)
302 tcp_connection_t *tcp_connection_alloc (u8 thread_index);
303 tcp_connection_t *tcp_connection_alloc_w_base (u8 thread_index,
304 tcp_connection_t * base);
305 void tcp_connection_free (tcp_connection_t * tc);
306 void tcp_connection_close (tcp_connection_t * tc);
307 void tcp_connection_cleanup (tcp_connection_t * tc);
308 void tcp_connection_del (tcp_connection_t * tc);
309 int tcp_half_open_connection_cleanup (tcp_connection_t * tc);
311 void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt,
312 u32 thread_index, u8 is_ip4);
313 void tcp_send_reset (tcp_connection_t * tc);
314 void tcp_send_syn (tcp_connection_t * tc);
315 void tcp_send_synack (tcp_connection_t * tc);
316 void tcp_send_fin (tcp_connection_t * tc);
317 void tcp_send_ack (tcp_connection_t * tc);
318 void tcp_send_window_update_ack (tcp_connection_t * tc);
320 void tcp_program_ack (tcp_connection_t * tc);
321 void tcp_program_dupack (tcp_connection_t * tc);
322 void tcp_program_retransmit (tcp_connection_t * tc);
324 void tcp_update_burst_snd_vars (tcp_connection_t * tc);
325 u32 tcp_snd_space (tcp_connection_t * tc);
326 int tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc);
327 void tcp_reschedule (tcp_connection_t * tc);
328 fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc);
329 u32 tcp_session_push_header (transport_connection_t * tconn,
331 int tcp_session_custom_tx (void *conn, u32 max_burst_size);
333 void tcp_connection_timers_init (tcp_connection_t * tc);
334 void tcp_connection_timers_reset (tcp_connection_t * tc);
335 void tcp_init_snd_vars (tcp_connection_t * tc);
336 void tcp_connection_init_vars (tcp_connection_t * tc);
337 void tcp_connection_tx_pacer_update (tcp_connection_t * tc);
338 void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
340 void tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
342 void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
343 int tcp_configure_v4_source_address_range (vlib_main_t * vm,
344 ip4_address_t * start,
345 ip4_address_t * end, u32 table_id);
346 int tcp_configure_v6_source_address_range (vlib_main_t * vm,
347 ip6_address_t * start,
348 ip6_address_t * end, u32 table_id);
350 clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en);
352 format_function_t format_tcp_state;
353 format_function_t format_tcp_flags;
354 format_function_t format_tcp_sacks;
355 format_function_t format_tcp_rcv_sacks;
356 format_function_t format_tcp_connection;
357 format_function_t format_tcp_connection_id;
360 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
362 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
363 ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID);
364 tc->timers[timer_id] =
365 tw_timer_start_16t_2w_512sl (&tcp_main.
366 wrk_ctx[tc->c_thread_index].timer_wheel,
367 tc->c_c_index, timer_id, interval);
371 tcp_timer_reset (tcp_connection_t * tc, u8 timer_id)
373 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
374 if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
377 tw_timer_stop_16t_2w_512sl (&tcp_main.
378 wrk_ctx[tc->c_thread_index].timer_wheel,
379 tc->timers[timer_id]);
380 tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
384 tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval)
386 ASSERT (tc->c_thread_index == vlib_get_thread_index ());
387 if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
388 tw_timer_update_16t_2w_512sl (&tcp_main.
389 wrk_ctx[tc->c_thread_index].timer_wheel,
390 tc->timers[timer_id], interval);
392 tc->timers[timer_id] =
393 tw_timer_start_16t_2w_512sl (&tcp_main.
394 wrk_ctx[tc->c_thread_index].timer_wheel,
395 tc->c_c_index, timer_id, interval);
399 tcp_retransmit_timer_set (tcp_connection_t * tc)
401 ASSERT (tc->snd_una != tc->snd_una_max);
402 tcp_timer_set (tc, TCP_TIMER_RETRANSMIT,
403 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
407 tcp_retransmit_timer_reset (tcp_connection_t * tc)
409 tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT);
413 tcp_retransmit_timer_force_update (tcp_connection_t * tc)
415 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
416 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
420 tcp_persist_timer_set (tcp_connection_t * tc)
422 /* Reuse RTO. It's backed off in handler */
423 tcp_timer_set (tc, TCP_TIMER_PERSIST,
424 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
428 tcp_persist_timer_update (tcp_connection_t * tc)
432 if (seq_leq (tc->snd_una, tc->snd_congestion + tc->burst_acked))
435 interval = clib_max (tc->rto * TCP_TO_TIMER_TICK, 1);
437 tcp_timer_update (tc, TCP_TIMER_PERSIST, interval);
441 tcp_persist_timer_reset (tcp_connection_t * tc)
443 tcp_timer_reset (tc, TCP_TIMER_PERSIST);
447 tcp_retransmit_timer_update (tcp_connection_t * tc)
449 if (tc->snd_una == tc->snd_nxt)
451 tcp_retransmit_timer_reset (tc);
452 if (tc->snd_wnd < tc->snd_mss)
453 tcp_persist_timer_update (tc);
456 tcp_timer_update (tc, TCP_TIMER_RETRANSMIT,
457 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
461 tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
463 return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
466 #define tcp_validate_txf_size(_tc, _a) \
467 ASSERT(_tc->state != TCP_STATE_ESTABLISHED \
468 || transport_max_tx_dequeue (&_tc->connection) >= _a)
470 #endif /* _vnet_tcp_h_ */
473 * fd.io coding-style-patch-verification: ON
476 * eval: (c-set-style "gnu")