2 * Copyright (c) 2017 SUSE LLC.
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.
15 #ifndef included_vnet_sctp_h
16 #define included_vnet_sctp_h
18 #include <vnet/vnet.h>
19 #include <vnet/ip/ip.h>
20 #include <vnet/sctp/sctp_timer.h>
21 #include <vnet/sctp/sctp_packet.h>
22 #include <vnet/session/transport.h>
23 #include <vnet/session/session.h>
26 #define foreach_sctp_timer \
27 _(T1_INIT, "T1_INIT") \
28 _(T1_COOKIE, "T1_COOKIE") \
29 _(T2_SHUTDOWN, "T2_SHUTDOWN") \
30 _(T3_RXTX, "T3_RXTX") \
31 _(T4_HEARTBEAT, "T4_HB") \
32 _(T5_SHUTDOWN_GUARD, "T5_SHUTDOWN_GUARD")
34 typedef enum _sctp_timers
36 #define _(sym, str) SCTP_TIMER_##sym,
42 #define SCTP_TIMER_HANDLE_INVALID ((u32) ~0)
45 sctp_timer_to_string (u8 timer_id)
49 case SCTP_TIMER_T1_INIT:
50 return "SCTP_TIMER_T1_INIT";
51 case SCTP_TIMER_T1_COOKIE:
52 return "SCTP_TIMER_T1_COOKIE";
53 case SCTP_TIMER_T2_SHUTDOWN:
54 return "SCTP_TIMER_T2_SHUTDOWN";
55 case SCTP_TIMER_T3_RXTX:
56 return "SCTP_TIMER_T3_RXTX";
57 case SCTP_TIMER_T4_HEARTBEAT:
58 return "SCTP_TIMER_T4_HEARTBEAT";
59 case SCTP_TIMER_T5_SHUTDOWN_GUARD:
60 return "SCTP_TIMER_T5_SHUTDOWN_GUARD";
65 typedef enum _sctp_error
67 #define sctp_error(n,s) SCTP_ERROR_##n,
68 #include <vnet/sctp/sctp_error.def>
75 #define IS_T_BIT_SET(var) ((var) & (1))
76 #define IS_E_BIT_SET(var) ((var) & (1))
77 #define IS_B_BIT_SET(var) ((var) & (1<<1))
78 #define IS_U_BIT_SET(var) ((var) & (1<<2))
80 #define MAX_SCTP_CONNECTIONS 8
81 #define MAIN_SCTP_SUB_CONN_IDX 0
83 #if (VLIB_BUFFER_TRACE_TRAJECTORY)
84 #define sctp_trajectory_add_start(b, start) \
86 (*vlib_buffer_trace_trajectory_cb) (b, start); \
89 #define sctp_trajectory_add_start(b, start)
92 enum _sctp_subconn_state
94 SCTP_SUBCONN_STATE_DOWN = 0,
95 SCTP_SUBCONN_STATE_UP,
96 SCTP_SUBCONN_STATE_ALLOW_HB
99 #define SCTP_INITIAL_SSHTRESH 65535
100 typedef struct _sctp_sub_connection
102 transport_connection_t connection; /**< Common transport data. First! */
104 u8 subconn_idx; /**< This indicates the position of this sub-connection in the super-set container of connections pool */
105 u32 error_count; /**< The current error count for this destination. */
106 u32 error_threshold; /**< Current error threshold for this destination,
107 i.e. what value marks the destination down if error count reaches this value. */
108 u32 cwnd; /**< Congestion control window (cwnd, in bytes), which is adjusted by
109 the sender based on observed network conditions. */
110 u32 ssthresh; /**< Slow-start threshold (in bytes), which is used by the
111 sender to distinguish slow-start and congestion avoidance phases. */
113 u32 rtt_ts; /**< USED to hold the timestamp of when the packet has been sent */
115 u32 RTO; /**< The current retransmission timeout value. */
116 u32 SRTT; /**< The current smoothed round-trip time. */
117 f32 RTTVAR; /**< The current RTT variation. */
119 u32 partially_acked_bytes; /**< The tracking method for increase of cwnd when in
120 congestion avoidance mode (see Section 7.2.2).*/
122 u8 state; /**< The current state of this destination, i.e., DOWN, UP, ALLOW-HB, NO-HEARTBEAT, etc. */
124 u16 PMTU; /**< The current known path MTU. */
126 u32 timers[SCTP_N_TIMERS]; /**< A timer used by each destination. */
128 u8 RTO_pending; /**< A flag used to track if one of the DATA chunks sent to
129 this address is currently being used to compute an RTT.
130 If this flag is 0, the next DATA chunk sent to this destination
131 should be used to compute an RTT and this flag should be set.
132 Every time the RTT calculation completes (i.e., the DATA chunk is SACK'd),
135 u32 last_seen; /**< The time to which this destination was last sent a packet to.
136 This can be used to determine if a HEARTBEAT is needed. */
138 u32 last_data_ts; /**< Used to hold the timestamp value of last time we sent a DATA chunk */
140 u8 unacknowledged_hb; /**< Used to track how many unacknowledged heartbeats we had;
141 If more than SCTP_PATH_MAX_RETRANS then connection is considered unreachable. */
143 u8 is_retransmitting; /**< A flag (0 = no, 1 = yes) indicating whether the connection is retransmitting a previous packet */
145 u8 enqueue_state; /**< if set to 1 indicates that DATA is still being handled hence cannot shutdown this connection yet */
147 } sctp_sub_connection_t;
151 u32 a_rwnd; /**< Maximum segment size advertised */
155 /* Useful macros to deal with the out_of_order_map (array of bit) */
156 #define SET_BIT(A,k) ( A[(k/32)] |= (1 << (k%32)) )
157 #define CLEAR_BIT(A,k) ( A[(k/32)] &= ~(1 << (k%32)) )
158 #define TEST_BIT(A,k) ( A[(k/32)] & (1 << (k%32)) )
161 _bytes_swap (void *pv, size_t n)
165 for (lo = 0, hi = n - 1; hi > lo; lo++, hi--)
173 #define ENDIANESS_SWAP(x) _bytes_swap(&x, sizeof(x));
175 #define MAX_INFLIGHT_PACKETS 128
176 #define MAX_ENQUEABLE_SACKS 2
178 /* This parameter indicates to the receiver how much increment in
179 * milliseconds the sender wishes the receiver to add to its default
182 #define SUGGESTED_COOKIE_LIFE_SPAN_INCREMENT 1000
184 typedef struct _sctp_connection
186 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
188 u8 state; /**< SCTP state as per sctp_state_t */
189 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
191 u32 local_tag; /**< INIT_TAG generated locally */
192 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
194 u32 local_initial_tsn; /**< Initial TSN generated locally */
195 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
197 u32 peer_cookie_life_span_increment;
199 u32 overall_err_count; /**< The overall association error count. */
200 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
201 reaches will cause this association to be torn down. */
203 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
205 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
206 This is sent in the INIT or INIT ACK chunk to the peer
207 and incremented each time a DATA chunk is assigned a
208 TSN (normally just prior to transmit or during
211 u32 last_unacked_tsn; /** < Last TSN number still unacked */
212 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
214 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
215 is set initially by taking the peer's initial TSN,
216 received in the INIT or INIT ACK chunk, and
217 subtracting one from it. */
219 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
220 TSNs have been received (relative to the Last Rcvd TSN).
221 If no gaps exist, i.e., no out-of-order packets have been received,
222 this array will be set to all zero. */
224 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
225 This is initialized to 0. When a packet is received it is incremented.
226 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
227 Note: This is used only when no DATA chunks are received out-of-order.
228 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
230 u8 smallest_PMTU_idx; /** The index of the sub-connection with the smallest PMTU discovered across all peer's transport addresses. */
232 u8 overall_sending_status; /**< 0 indicates first fragment of a user message
233 1 indicates normal stream
234 2 indicates last fragment of a user message */
236 sctp_options_t snd_opts;
238 u8 forming_association_changed; /**< This is a flag indicating whether the original association has been modified during
239 the life-span of the association itself. For instance, a new sub-connection might have been added. */
243 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
245 sctp_connection_t *sctp_connection_new (u8 thread_index);
248 sctp_sub_connection_add_ip4 (vlib_main_t * vm,
249 ip4_address_t * lcl_addr,
250 ip4_address_t * rmt_addr);
253 sctp_sub_connection_add_ip6 (vlib_main_t * vm,
254 ip6_address_t * lcl_addr,
255 ip6_address_t * rmt_addr);
257 void sctp_connection_close (sctp_connection_t * sctp_conn);
258 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
259 void sctp_connection_del (sctp_connection_t * sctp_conn);
261 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
262 void sctp_send_init (sctp_connection_t * sctp_conn);
263 void sctp_send_shutdown (sctp_connection_t * sctp_conn);
264 void sctp_send_shutdown_ack (sctp_connection_t * sctp_conn, u8 idx,
266 void sctp_send_shutdown_complete (sctp_connection_t * sctp_conn, u8 idx,
268 void sctp_send_heartbeat (sctp_connection_t * sctp_conn);
269 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
271 void sctp_flush_frames_to_output (u8 thread_index);
272 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
274 format_function_t format_sctp_state;
276 u8 *format_sctp_connection_id (u8 * s, va_list * args);
277 u8 *format_sctp_connection (u8 * s, va_list * args);
278 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
279 u8 *format_sctp_header (u8 * s, va_list * args);
280 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
282 clib_error_t *sctp_init (vlib_main_t * vm);
283 void sctp_connection_timers_init (sctp_connection_t * sctp_conn);
284 void sctp_connection_timers_reset (sctp_connection_t * sctp_conn);
285 void sctp_init_snd_vars (sctp_connection_t * sctp_conn);
286 void sctp_init_mss (sctp_connection_t * sctp_conn);
288 void sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, u8 idx,
289 vlib_buffer_t * b, ip4_address_t * ip4_addr,
290 ip6_address_t * ip6_addr);
292 sctp_prepare_initack_chunk_for_collision (sctp_connection_t * sctp_conn,
293 u8 idx, vlib_buffer_t * b,
294 ip4_address_t * ip4_addr,
295 ip6_address_t * ip6_addr);
296 void sctp_prepare_abort_for_collision (sctp_connection_t * sctp_conn, u8 idx,
298 ip4_address_t * ip4_addr,
299 ip6_address_t * ip6_addr);
301 sctp_prepare_operation_error (sctp_connection_t * sctp_conn, u8 idx,
302 vlib_buffer_t * b, u8 err_cause);
303 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn, u8 idx,
305 sctp_state_cookie_param_t * sc);
306 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
308 void sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, u8 idx,
310 void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
313 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * sctp_conn);
315 void sctp_api_reference (void);
317 #define IP_PROTOCOL_SCTP 132
319 /** SSCTP FSM state definitions as per RFC4960. */
320 #define foreach_sctp_fsm_state \
321 _(CLOSED, "CLOSED") \
322 _(COOKIE_WAIT, "COOKIE_WAIT") \
323 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
324 _(ESTABLISHED, "ESTABLISHED") \
325 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
326 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
327 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
328 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
330 typedef enum _sctp_state
332 #define _(sym, str) SCTP_STATE_##sym,
333 foreach_sctp_fsm_state
339 sctp_state_to_string (u8 state)
343 case SCTP_STATE_CLOSED:
344 return "SCTP_STATE_CLOSED";
345 case SCTP_STATE_COOKIE_WAIT:
346 return "SCTP_STATE_COOKIE_WAIT";
347 case SCTP_STATE_COOKIE_ECHOED:
348 return "SCTP_STATE_COOKIE_ECHOED";
349 case SCTP_STATE_ESTABLISHED:
350 return "SCTP_STATE_ESTABLISHED";
351 case SCTP_STATE_SHUTDOWN_PENDING:
352 return "SCTP_STATE_SHUTDOWN_PENDING";
353 case SCTP_STATE_SHUTDOWN_SENT:
354 return "SCTP_STATE_SHUTDOWN_SENT";
355 case SCTP_STATE_SHUTDOWN_RECEIVED:
356 return "SCTP_STATE_SHUTDOWN_RECEIVED";
357 case SCTP_STATE_SHUTDOWN_ACK_SENT:
358 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
364 sctp_chunk_to_string (u8 type)
379 return "HEARTBEAT_ACK";
385 return "SHUTDOWN_ACK";
386 case OPERATION_ERROR:
387 return "OPERATION_ERROR";
389 return "COOKIE_ECHO";
396 case SHUTDOWN_COMPLETE:
397 return "SHUTDOWN_COMPLETE";
403 sctp_optparam_type_to_string (u8 type)
407 case SCTP_IPV4_ADDRESS_TYPE:
408 return "SCTP_IPV4_ADDRESS_TYPE";
409 case SCTP_IPV6_ADDRESS_TYPE:
410 return "SCTP_IPV6_ADDRESS_TYPE";
411 case SCTP_STATE_COOKIE_TYPE:
412 return "SCTP_STATE_COOKIE_TYPE";
413 case SCTP_UNRECOGNIZED_TYPE:
414 return "SCTP_UNRECOGNIZED_TYPE";
415 case SCTP_COOKIE_PRESERVATIVE_TYPE:
416 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
417 case SCTP_HOSTNAME_ADDRESS_TYPE:
418 return "SCTP_HOSTNAME_ADDRESS_TYPE";
419 case SCTP_SUPPORTED_ADDRESS_TYPES:
420 return "SCTP_SUPPORTED_ADDRESS_TYPES";
425 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
426 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
427 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
429 /* As per RFC4960, page 83 */
430 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
431 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
432 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
433 #define SCTP_RTO_BURST 4
434 #define SCTP_RTO_ALPHA 1/8
435 #define SCTP_RTO_BETA 1/4
436 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
437 #define SCTP_ASSOCIATION_MAX_RETRANS 10 // the overall connection
438 #define SCTP_PATH_MAX_RETRANS 5 // number of attempts per destination address
439 #define SCTP_MAX_INIT_RETRANS 8 // number of attempts
440 #define SCTP_HB_INTERVAL 30 * SHZ
441 #define SCTP_HB_MAX_BURST 1
443 #define SCTP_DATA_IDLE_INTERVAL 15 * SHZ /* 15 seconds; the time-interval after which the connetion is considered IDLE */
445 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
447 typedef struct _sctp_lookup_dispatch
450 } sctp_lookup_dispatch_t;
452 typedef struct _sctp_main
454 /* Per-worker thread SCTP connection pools */
455 sctp_connection_t **connections;
457 /* Pool of listeners. */
458 sctp_connection_t *listener_pool;
460 /** Dispatch table by state and flags */
461 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
463 u8 log2_tstamp_clocks_per_tick;
464 f64 tstamp_ticks_per_clock;
467 /** per-worker tx buffer free lists */
469 /** per-worker tx frames to SCTP 4/6 output nodes */
470 vlib_frame_t **tx_frames[2];
471 /** per-worker tx frames to ip 4/6 lookup nodes */
472 vlib_frame_t **ip_lookup_tx_frames[2];
474 /* Per worker-thread timer wheel for connections timers */
475 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
477 /* Pool of half-open connections on which we've sent a SYN */
478 sctp_connection_t *half_open_connections;
479 clib_spinlock_t half_open_lock;
481 /* TODO: Congestion control algorithms registered */
482 /* sctp_cc_algorithm_t *cc_algos; */
484 /* Flag that indicates if stack is on or off */
487 /** Number of preallocated connections */
488 u32 preallocated_connections;
490 /** Transport table (preallocation) size parameters */
491 u32 local_endpoints_table_memory;
492 u32 local_endpoints_table_buckets;
494 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
495 ip4_address_t *ip4_src_addresses;
496 u32 last_v4_address_rotor;
497 u32 last_v6_address_rotor;
498 ip6_address_t *ip6_src_addresses;
500 /** vlib buffer size */
501 u32 bytes_per_buffer;
508 extern sctp_main_t sctp_main;
509 extern vlib_node_registration_t sctp4_input_node;
510 extern vlib_node_registration_t sctp6_input_node;
511 extern vlib_node_registration_t sctp4_output_node;
512 extern vlib_node_registration_t sctp6_output_node;
514 always_inline sctp_main_t *
515 vnet_get_sctp_main ()
520 always_inline sctp_header_t *
521 sctp_buffer_hdr (vlib_buffer_t * b)
523 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
524 return (sctp_header_t *) (b->data + b->current_data
525 + vnet_buffer (b)->sctp.hdr_offset);
528 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
530 always_inline sctp_connection_t *
531 sctp_half_open_connection_get (u32 conn_index)
533 sctp_connection_t *tc = 0;
534 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
535 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
536 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
537 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].subconn_idx = MAIN_SCTP_SUB_CONN_IDX;
538 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
543 * Cleanup half-open connection
547 sctp_half_open_connection_del (sctp_connection_t * tc)
549 sctp_main_t *sctp_main = vnet_get_sctp_main ();
550 clib_spinlock_lock_if_init (&sctp_main->half_open_lock);
551 pool_put_index (sctp_main->half_open_connections,
552 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_c_index);
554 memset (tc, 0xFA, sizeof (*tc));
555 clib_spinlock_unlock_if_init (&sctp_main->half_open_lock);
559 sctp_set_time_now (u32 thread_index)
561 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
562 * sctp_main.tstamp_ticks_per_clock;
563 return sctp_main.time_now[thread_index];
567 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
570 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
571 vlib_get_thread_index ());
572 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
573 SCTP_TIMER_HANDLE_INVALID);
575 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
576 sub->timers[timer_id] =
577 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
578 sub->c_c_index, timer_id, interval);
582 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
584 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
585 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
588 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
590 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
591 sub->timers[timer_id]);
592 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
596 * Try to cleanup half-open connection
598 * If called from a thread that doesn't own tc, the call won't have any
601 * @param tc - connection to be cleaned up
602 * @return non-zero if cleanup failed.
605 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
607 /* Make sure this is the owning thread */
608 if (tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_thread_index !=
609 vlib_get_thread_index ())
611 sctp_timer_reset (tc, MAIN_SCTP_SUB_CONN_IDX, SCTP_TIMER_T1_INIT);
612 sctp_half_open_connection_del (tc);
619 return sizeof (sctp_header_t);
622 always_inline sctp_connection_t *
623 sctp_get_connection_from_transport (transport_connection_t * tconn)
625 ASSERT (tconn != NULL);
627 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
630 SCTP_ADV_DBG ("sub == NULL");
631 if (sub->parent == NULL)
632 SCTP_ADV_DBG ("sub->parent == NULL");
634 if (sub->subconn_idx > 0)
635 return (sctp_connection_t *) sub -
636 (sizeof (sctp_sub_connection_t) * (sub->subconn_idx - 1));
638 return (sctp_connection_t *) sub;
644 return sctp_main.time_now[vlib_get_thread_index ()];
647 #define ABS(x) ((x) > 0) ? (x) : -(x);
650 sctp_calculate_rto (sctp_connection_t * sctp_conn, u8 conn_idx)
652 /* See RFC4960, 6.3.1. RTO Calculation */
655 u32 now = sctp_time_now ();
656 u32 prev_ts = sctp_conn->sub_conn[conn_idx].rtt_ts;
657 u32 R = prev_ts - now;
659 if (sctp_conn->sub_conn[conn_idx].RTO == 0) // C1: Let's initialize our RTO
661 sctp_conn->sub_conn[conn_idx].RTO = SCTP_RTO_MIN;
665 if (sctp_conn->sub_conn[conn_idx].RTO == SCTP_RTO_MIN && sctp_conn->sub_conn[conn_idx].SRTT == 0) // C2: First RTT calculation
667 sctp_conn->sub_conn[conn_idx].SRTT = R;
671 RTTVAR = 100e-3; /* 100 ms */
673 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
675 else // C3: RTT already exists; let's recalculate
677 RTTVAR = (1 - SCTP_RTO_BETA) * sctp_conn->sub_conn[conn_idx].RTTVAR +
678 SCTP_RTO_BETA * ABS (sctp_conn->sub_conn[conn_idx].SRTT - R);
681 RTTVAR = 100e-3; /* 100 ms */
683 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
685 sctp_conn->sub_conn[conn_idx].SRTT =
686 (1 - SCTP_RTO_ALPHA) * sctp_conn->sub_conn[conn_idx].SRTT +
691 sctp_conn->sub_conn[conn_idx].SRTT +
692 4 * sctp_conn->sub_conn[conn_idx].RTTVAR;
693 if (RTO < SCTP_RTO_MIN) // C6
696 if (RTO > SCTP_RTO_MAX) // C7
699 sctp_conn->sub_conn[conn_idx].RTO = RTO;
703 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
706 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
707 vlib_get_thread_index ());
708 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
710 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
711 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
712 sub->timers[timer_id]);
714 tc->sub_conn[conn_idx].timers[timer_id] =
715 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
716 sub->c_c_index, timer_id, interval);
719 always_inline sctp_connection_t *
720 sctp_listener_get (u32 tli)
722 return pool_elt_at_index (sctp_main.listener_pool, tli);
727 always_inline sctp_connection_t *
728 sctp_connection_get (u32 conn_index, u32 thread_index)
731 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
733 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
736 #define SELECT_MAX_RETRIES 8
739 sctp_data_subconn_select (sctp_connection_t * sctp_conn)
741 u32 sub = MAIN_SCTP_SUB_CONN_IDX;
742 u8 i, cwnd = sctp_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].cwnd;
743 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
745 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
748 if (sctp_conn->sub_conn[i].cwnd > cwnd)
751 cwnd = sctp_conn->sub_conn[i].cwnd;
758 sctp_sub_conn_id_via_ip6h (sctp_connection_t * sctp_conn, ip6_header_t * ip6h)
762 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
764 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[0] ==
765 ip6h->dst_address.as_u64[0] &&
766 sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[1] ==
767 ip6h->dst_address.as_u64[1] &&
768 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[0] ==
769 ip6h->src_address.as_u64[0] &&
770 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
771 ip6h->src_address.as_u64[1])
774 clib_warning ("Did not find a sub-connection; defaulting to %u",
775 MAIN_SCTP_SUB_CONN_IDX);
776 return MAIN_SCTP_SUB_CONN_IDX;
780 sctp_sub_conn_id_via_ip4h (sctp_connection_t * sctp_conn, ip4_header_t * ip4h)
784 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
786 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip4.as_u32 ==
787 ip4h->dst_address.as_u32
788 && sctp_conn->sub_conn[i].connection.rmt_ip.ip4.as_u32 ==
789 ip4h->src_address.as_u32)
792 clib_warning ("Did not find a sub-connection; defaulting to %u",
793 MAIN_SCTP_SUB_CONN_IDX);
794 return MAIN_SCTP_SUB_CONN_IDX;
798 * Push SCTP header to buffer
800 * @param vm - vlib_main
801 * @param b - buffer to write the header to
802 * @param sp_net - source port net order
803 * @param dp_net - destination port net order
804 * @param sctp_hdr_opts_len - header and options length in bytes
806 * @return - pointer to start of SCTP header
809 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
810 u8 sctp_hdr_opts_len)
812 sctp_full_hdr_t *full_hdr;
814 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
816 full_hdr->hdr.src_port = sp;
817 full_hdr->hdr.dst_port = dp;
818 full_hdr->hdr.checksum = 0;
823 * Push SCTP header to buffer
825 * @param b - buffer to write the header to
826 * @param sp_net - source port net order
827 * @param dp_net - destination port net order
828 * @param sctp_hdr_opts_len - header and options length in bytes
830 * @return - pointer to start of SCTP header
833 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
834 u8 sctp_hdr_opts_len)
836 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
841 sctp_next_avail_subconn (sctp_connection_t * sctp_conn)
845 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
847 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
850 return MAX_SCTP_CONNECTIONS;
854 update_smallest_pmtu_idx (sctp_connection_t * sctp_conn)
857 u8 smallest_pmtu_index = MAIN_SCTP_SUB_CONN_IDX;
859 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
861 if (sctp_conn->sub_conn[i].state != SCTP_SUBCONN_STATE_DOWN)
863 if (sctp_conn->sub_conn[i].PMTU <
864 sctp_conn->sub_conn[smallest_pmtu_index].PMTU)
865 smallest_pmtu_index = i;
869 sctp_conn->smallest_PMTU_idx = smallest_pmtu_index;
872 /* As per RFC4960; section 7.2.1: Slow-Start */
874 sctp_init_cwnd (sctp_connection_t * sctp_conn)
877 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
879 /* Section 7.2.1; point (1) */
880 sctp_conn->sub_conn[i].cwnd =
881 clib_min (4 * sctp_conn->sub_conn[i].PMTU,
882 clib_max (2 * sctp_conn->sub_conn[i].PMTU, 4380));
884 /* Section 7.2.1; point (3) */
885 sctp_conn->sub_conn[i].ssthresh = SCTP_INITIAL_SSHTRESH;
887 /* Section 7.2.2; point (1) */
888 sctp_conn->sub_conn[i].partially_acked_bytes = 0;
893 sctp_in_cong_recovery (sctp_connection_t * sctp_conn, u8 idx)
899 cwnd_fully_utilized (sctp_connection_t * sctp_conn, u8 idx)
904 /* As per RFC4960; section 7.2.1: Slow-Start */
906 update_cwnd (sctp_connection_t * sctp_conn)
910 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
912 /* Section 7.2.1; point (2) */
913 if (sctp_conn->sub_conn[i].is_retransmitting)
915 sctp_conn->sub_conn[i].cwnd = 1 * sctp_conn->sub_conn[i].PMTU;
919 /* Section 7.2.2; point (4) */
920 if (sctp_conn->sub_conn[i].last_data_ts >
921 sctp_time_now () + SCTP_DATA_IDLE_INTERVAL)
923 sctp_conn->sub_conn[i].cwnd =
924 clib_max (sctp_conn->sub_conn[i].cwnd / 2,
925 4 * sctp_conn->sub_conn[i].PMTU);
929 /* Section 7.2.1; point (5) */
930 if (sctp_conn->sub_conn[i].cwnd <= sctp_conn->sub_conn[i].ssthresh)
932 if (!cwnd_fully_utilized (sctp_conn, i))
935 if (sctp_in_cong_recovery (sctp_conn, i))
938 sctp_conn->sub_conn[i].cwnd =
939 clib_min (sctp_conn->sub_conn[i].PMTU, 1);
945 * fd.io coding-style-patch-verification: ON
948 * eval: (c-set-style "gnu")