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 next_avail_sub_conn; /**< Represent the index of the next free slot in sub_conn */
240 u8 forming_association_changed; /**< This is a flag indicating whether the original association has been modified during
241 the life-span of the association itself. For instance, a new sub-connection might have been added. */
245 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
247 sctp_connection_t *sctp_connection_new (u8 thread_index);
248 void sctp_sub_connection_add_ip4 (u8 thread_index,
249 sctp_ipv4_addr_param_t * ipv4_addr);
250 void sctp_sub_connection_add_ip6 (u8 thread_index,
251 sctp_ipv6_addr_param_t * ipv6_addr);
252 void sctp_connection_close (sctp_connection_t * sctp_conn);
253 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
254 void sctp_connection_del (sctp_connection_t * sctp_conn);
256 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
257 void sctp_send_init (sctp_connection_t * sctp_conn);
258 void sctp_send_shutdown (sctp_connection_t * sctp_conn);
259 void sctp_send_shutdown_ack (sctp_connection_t * sctp_conn, u8 idx,
261 void sctp_send_shutdown_complete (sctp_connection_t * sctp_conn, u8 idx,
263 void sctp_send_heartbeat (sctp_connection_t * sctp_conn);
264 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
266 void sctp_flush_frames_to_output (u8 thread_index);
267 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
269 format_function_t format_sctp_state;
271 u8 *format_sctp_connection_id (u8 * s, va_list * args);
272 u8 *format_sctp_connection (u8 * s, va_list * args);
273 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
274 u8 *format_sctp_header (u8 * s, va_list * args);
275 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
277 clib_error_t *sctp_init (vlib_main_t * vm);
278 void sctp_connection_timers_init (sctp_connection_t * sctp_conn);
279 void sctp_connection_timers_reset (sctp_connection_t * sctp_conn);
280 void sctp_init_snd_vars (sctp_connection_t * sctp_conn);
281 void sctp_init_mss (sctp_connection_t * sctp_conn);
283 void sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, u8 idx,
284 vlib_buffer_t * b, ip4_address_t * ip4_addr,
285 ip6_address_t * ip6_addr);
287 sctp_prepare_initack_chunk_for_collision (sctp_connection_t * sctp_conn,
288 u8 idx, vlib_buffer_t * b,
289 ip4_address_t * ip4_addr,
290 ip6_address_t * ip6_addr);
291 void sctp_prepare_abort_for_collision (sctp_connection_t * sctp_conn, u8 idx,
293 ip4_address_t * ip4_addr,
294 ip6_address_t * ip6_addr);
296 sctp_prepare_operation_error (sctp_connection_t * sctp_conn, u8 idx,
297 vlib_buffer_t * b, u8 err_cause);
298 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn, u8 idx,
300 sctp_state_cookie_param_t * sc);
301 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
303 void sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, u8 idx,
305 void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
308 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * sctp_conn);
310 #define IP_PROTOCOL_SCTP 132
312 /** SSCTP FSM state definitions as per RFC4960. */
313 #define foreach_sctp_fsm_state \
314 _(CLOSED, "CLOSED") \
315 _(COOKIE_WAIT, "COOKIE_WAIT") \
316 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
317 _(ESTABLISHED, "ESTABLISHED") \
318 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
319 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
320 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
321 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
323 typedef enum _sctp_state
325 #define _(sym, str) SCTP_STATE_##sym,
326 foreach_sctp_fsm_state
332 sctp_state_to_string (u8 state)
336 case SCTP_STATE_CLOSED:
337 return "SCTP_STATE_CLOSED";
338 case SCTP_STATE_COOKIE_WAIT:
339 return "SCTP_STATE_COOKIE_WAIT";
340 case SCTP_STATE_COOKIE_ECHOED:
341 return "SCTP_STATE_COOKIE_ECHOED";
342 case SCTP_STATE_ESTABLISHED:
343 return "SCTP_STATE_ESTABLISHED";
344 case SCTP_STATE_SHUTDOWN_PENDING:
345 return "SCTP_STATE_SHUTDOWN_PENDING";
346 case SCTP_STATE_SHUTDOWN_SENT:
347 return "SCTP_STATE_SHUTDOWN_SENT";
348 case SCTP_STATE_SHUTDOWN_RECEIVED:
349 return "SCTP_STATE_SHUTDOWN_RECEIVED";
350 case SCTP_STATE_SHUTDOWN_ACK_SENT:
351 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
357 sctp_chunk_to_string (u8 type)
372 return "HEARTBEAT_ACK";
378 return "SHUTDOWN_ACK";
379 case OPERATION_ERROR:
380 return "OPERATION_ERROR";
382 return "COOKIE_ECHO";
389 case SHUTDOWN_COMPLETE:
390 return "SHUTDOWN_COMPLETE";
396 sctp_optparam_type_to_string (u8 type)
400 case SCTP_IPV4_ADDRESS_TYPE:
401 return "SCTP_IPV4_ADDRESS_TYPE";
402 case SCTP_IPV6_ADDRESS_TYPE:
403 return "SCTP_IPV6_ADDRESS_TYPE";
404 case SCTP_STATE_COOKIE_TYPE:
405 return "SCTP_STATE_COOKIE_TYPE";
406 case SCTP_UNRECOGNIZED_TYPE:
407 return "SCTP_UNRECOGNIZED_TYPE";
408 case SCTP_COOKIE_PRESERVATIVE_TYPE:
409 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
410 case SCTP_HOSTNAME_ADDRESS_TYPE:
411 return "SCTP_HOSTNAME_ADDRESS_TYPE";
412 case SCTP_SUPPORTED_ADDRESS_TYPES:
413 return "SCTP_SUPPORTED_ADDRESS_TYPES";
418 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
419 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
420 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
422 /* As per RFC4960, page 83 */
423 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
424 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
425 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
426 #define SCTP_RTO_BURST 4
427 #define SCTP_RTO_ALPHA 1/8
428 #define SCTP_RTO_BETA 1/4
429 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
430 #define SCTP_ASSOCIATION_MAX_RETRANS 10 // the overall connection
431 #define SCTP_PATH_MAX_RETRANS 5 // number of attempts per destination address
432 #define SCTP_MAX_INIT_RETRANS 8 // number of attempts
433 #define SCTP_HB_INTERVAL 30 * SHZ
434 #define SCTP_HB_MAX_BURST 1
436 #define SCTP_DATA_IDLE_INTERVAL 15 * SHZ /* 15 seconds; the time-interval after which the connetion is considered IDLE */
438 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
440 typedef struct _sctp_lookup_dispatch
443 } sctp_lookup_dispatch_t;
445 typedef struct _sctp_main
447 /* Per-worker thread SCTP connection pools */
448 sctp_connection_t **connections;
450 /* Pool of listeners. */
451 sctp_connection_t *listener_pool;
453 /** Dispatch table by state and flags */
454 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
456 u8 log2_tstamp_clocks_per_tick;
457 f64 tstamp_ticks_per_clock;
460 /** per-worker tx buffer free lists */
462 /** per-worker tx frames to SCTP 4/6 output nodes */
463 vlib_frame_t **tx_frames[2];
464 /** per-worker tx frames to ip 4/6 lookup nodes */
465 vlib_frame_t **ip_lookup_tx_frames[2];
467 /* Per worker-thread timer wheel for connections timers */
468 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
470 /* Pool of half-open connections on which we've sent a SYN */
471 sctp_connection_t *half_open_connections;
472 clib_spinlock_t half_open_lock;
474 /* TODO: Congestion control algorithms registered */
475 /* sctp_cc_algorithm_t *cc_algos; */
477 /* Flag that indicates if stack is on or off */
480 /** Number of preallocated connections */
481 u32 preallocated_connections;
483 /** Transport table (preallocation) size parameters */
484 u32 local_endpoints_table_memory;
485 u32 local_endpoints_table_buckets;
487 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
488 ip4_address_t *ip4_src_addresses;
489 u32 last_v4_address_rotor;
490 u32 last_v6_address_rotor;
491 ip6_address_t *ip6_src_addresses;
493 /** vlib buffer size */
494 u32 bytes_per_buffer;
501 extern sctp_main_t sctp_main;
502 extern vlib_node_registration_t sctp4_input_node;
503 extern vlib_node_registration_t sctp6_input_node;
504 extern vlib_node_registration_t sctp4_output_node;
505 extern vlib_node_registration_t sctp6_output_node;
507 always_inline sctp_main_t *
508 vnet_get_sctp_main ()
513 always_inline sctp_header_t *
514 sctp_buffer_hdr (vlib_buffer_t * b)
516 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
517 return (sctp_header_t *) (b->data + b->current_data
518 + vnet_buffer (b)->sctp.hdr_offset);
521 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
523 always_inline sctp_connection_t *
524 sctp_half_open_connection_get (u32 conn_index)
526 sctp_connection_t *tc = 0;
527 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
528 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
529 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
530 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].subconn_idx = MAIN_SCTP_SUB_CONN_IDX;
531 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
536 * Cleanup half-open connection
540 sctp_half_open_connection_del (sctp_connection_t * tc)
542 sctp_main_t *sctp_main = vnet_get_sctp_main ();
543 clib_spinlock_lock_if_init (&sctp_main->half_open_lock);
544 pool_put_index (sctp_main->half_open_connections,
545 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_c_index);
547 memset (tc, 0xFA, sizeof (*tc));
548 clib_spinlock_unlock_if_init (&sctp_main->half_open_lock);
552 sctp_set_time_now (u32 thread_index)
554 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
555 * sctp_main.tstamp_ticks_per_clock;
556 return sctp_main.time_now[thread_index];
560 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
563 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
564 vlib_get_thread_index ());
565 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
566 SCTP_TIMER_HANDLE_INVALID);
568 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
569 sub->timers[timer_id] =
570 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
571 sub->c_c_index, timer_id, interval);
575 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
577 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
578 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
581 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
583 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
584 sub->timers[timer_id]);
585 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
589 * Try to cleanup half-open connection
591 * If called from a thread that doesn't own tc, the call won't have any
594 * @param tc - connection to be cleaned up
595 * @return non-zero if cleanup failed.
598 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
600 /* Make sure this is the owning thread */
601 if (tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_thread_index !=
602 vlib_get_thread_index ())
604 sctp_timer_reset (tc, MAIN_SCTP_SUB_CONN_IDX, SCTP_TIMER_T1_INIT);
605 sctp_half_open_connection_del (tc);
612 return sizeof (sctp_header_t);
615 always_inline sctp_connection_t *
616 sctp_get_connection_from_transport (transport_connection_t * tconn)
618 ASSERT (tconn != NULL);
620 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
623 SCTP_ADV_DBG ("sub == NULL");
624 if (sub->parent == NULL)
625 SCTP_ADV_DBG ("sub->parent == NULL");
627 if (sub->subconn_idx > 0)
628 return (sctp_connection_t *) sub -
629 (sizeof (sctp_sub_connection_t) * (sub->subconn_idx - 1));
631 return (sctp_connection_t *) sub;
637 return sctp_main.time_now[vlib_get_thread_index ()];
640 #define ABS(x) ((x) > 0) ? (x) : -(x);
643 sctp_calculate_rto (sctp_connection_t * sctp_conn, u8 conn_idx)
645 /* See RFC4960, 6.3.1. RTO Calculation */
648 u32 now = sctp_time_now ();
649 u32 prev_ts = sctp_conn->sub_conn[conn_idx].rtt_ts;
650 u32 R = prev_ts - now;
652 if (sctp_conn->sub_conn[conn_idx].RTO == 0) // C1: Let's initialize our RTO
654 sctp_conn->sub_conn[conn_idx].RTO = SCTP_RTO_MIN;
658 if (sctp_conn->sub_conn[conn_idx].RTO == SCTP_RTO_MIN && sctp_conn->sub_conn[conn_idx].SRTT == 0) // C2: First RTT calculation
660 sctp_conn->sub_conn[conn_idx].SRTT = R;
664 RTTVAR = 100e-3; /* 100 ms */
666 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
668 else // C3: RTT already exists; let's recalculate
670 RTTVAR = (1 - SCTP_RTO_BETA) * sctp_conn->sub_conn[conn_idx].RTTVAR +
671 SCTP_RTO_BETA * ABS (sctp_conn->sub_conn[conn_idx].SRTT - R);
674 RTTVAR = 100e-3; /* 100 ms */
676 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
678 sctp_conn->sub_conn[conn_idx].SRTT =
679 (1 - SCTP_RTO_ALPHA) * sctp_conn->sub_conn[conn_idx].SRTT +
684 sctp_conn->sub_conn[conn_idx].SRTT +
685 4 * sctp_conn->sub_conn[conn_idx].RTTVAR;
686 if (RTO < SCTP_RTO_MIN) // C6
689 if (RTO > SCTP_RTO_MAX) // C7
692 sctp_conn->sub_conn[conn_idx].RTO = RTO;
696 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
699 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
700 vlib_get_thread_index ());
701 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
703 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
704 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
705 sub->timers[timer_id]);
707 tc->sub_conn[conn_idx].timers[timer_id] =
708 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
709 sub->c_c_index, timer_id, interval);
712 always_inline sctp_connection_t *
713 sctp_listener_get (u32 tli)
715 return pool_elt_at_index (sctp_main.listener_pool, tli);
720 always_inline sctp_connection_t *
721 sctp_connection_get (u32 conn_index, u32 thread_index)
724 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
726 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
729 #define SELECT_MAX_RETRIES 8
732 sctp_data_subconn_select (sctp_connection_t * sctp_conn)
734 u32 sub = MAIN_SCTP_SUB_CONN_IDX;
735 u8 i, cwnd = sctp_conn->sub_conn[MAIN_SCTP_SUB_CONN_IDX].cwnd;
736 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
738 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
741 if (sctp_conn->sub_conn[i].cwnd > cwnd)
744 cwnd = sctp_conn->sub_conn[i].cwnd;
751 sctp_sub_conn_id_via_ip6h (sctp_connection_t * sctp_conn, ip6_header_t * ip6h)
755 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
757 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[0] ==
758 ip6h->dst_address.as_u64[0] &&
759 sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[1] ==
760 ip6h->dst_address.as_u64[1] &&
761 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[0] ==
762 ip6h->src_address.as_u64[0] &&
763 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
764 ip6h->src_address.as_u64[1])
767 clib_warning ("Did not find a sub-connection; defaulting to %u",
768 MAIN_SCTP_SUB_CONN_IDX);
769 return MAIN_SCTP_SUB_CONN_IDX;
773 sctp_sub_conn_id_via_ip4h (sctp_connection_t * sctp_conn, ip4_header_t * ip4h)
777 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
779 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip4.as_u32 ==
780 ip4h->dst_address.as_u32
781 && sctp_conn->sub_conn[i].connection.rmt_ip.ip4.as_u32 ==
782 ip4h->src_address.as_u32)
785 clib_warning ("Did not find a sub-connection; defaulting to %u",
786 MAIN_SCTP_SUB_CONN_IDX);
787 return MAIN_SCTP_SUB_CONN_IDX;
791 * Push SCTP header to buffer
793 * @param vm - vlib_main
794 * @param b - buffer to write the header to
795 * @param sp_net - source port net order
796 * @param dp_net - destination port net order
797 * @param sctp_hdr_opts_len - header and options length in bytes
799 * @return - pointer to start of SCTP header
802 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
803 u8 sctp_hdr_opts_len)
805 sctp_full_hdr_t *full_hdr;
807 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
809 full_hdr->hdr.src_port = sp;
810 full_hdr->hdr.dst_port = dp;
811 full_hdr->hdr.checksum = 0;
816 * Push SCTP header to buffer
818 * @param b - buffer to write the header to
819 * @param sp_net - source port net order
820 * @param dp_net - destination port net order
821 * @param sctp_hdr_opts_len - header and options length in bytes
823 * @return - pointer to start of SCTP header
826 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
827 u8 sctp_hdr_opts_len)
829 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
834 update_smallest_pmtu_idx (sctp_connection_t * sctp_conn)
837 u8 smallest_pmtu_index = MAIN_SCTP_SUB_CONN_IDX;
839 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
841 if (sctp_conn->sub_conn[i].state != SCTP_SUBCONN_STATE_DOWN)
843 if (sctp_conn->sub_conn[i].PMTU <
844 sctp_conn->sub_conn[smallest_pmtu_index].PMTU)
845 smallest_pmtu_index = i;
849 sctp_conn->smallest_PMTU_idx = smallest_pmtu_index;
852 /* As per RFC4960; section 7.2.1: Slow-Start */
854 sctp_init_cwnd (sctp_connection_t * sctp_conn)
857 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
859 /* Section 7.2.1; point (1) */
860 sctp_conn->sub_conn[i].cwnd =
861 clib_min (4 * sctp_conn->sub_conn[i].PMTU,
862 clib_max (2 * sctp_conn->sub_conn[i].PMTU, 4380));
864 /* Section 7.2.1; point (3) */
865 sctp_conn->sub_conn[i].ssthresh = SCTP_INITIAL_SSHTRESH;
867 /* Section 7.2.2; point (1) */
868 sctp_conn->sub_conn[i].partially_acked_bytes = 0;
873 sctp_in_cong_recovery (sctp_connection_t * sctp_conn, u8 idx)
879 cwnd_fully_utilized (sctp_connection_t * sctp_conn, u8 idx)
884 /* As per RFC4960; section 7.2.1: Slow-Start */
886 update_cwnd (sctp_connection_t * sctp_conn)
890 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
892 /* Section 7.2.1; point (2) */
893 if (sctp_conn->sub_conn[i].is_retransmitting)
895 sctp_conn->sub_conn[i].cwnd = 1 * sctp_conn->sub_conn[i].PMTU;
899 /* Section 7.2.2; point (4) */
900 if (sctp_conn->sub_conn[i].last_data_ts >
901 sctp_time_now () + SCTP_DATA_IDLE_INTERVAL)
903 sctp_conn->sub_conn[i].cwnd =
904 clib_max (sctp_conn->sub_conn[i].cwnd / 2,
905 4 * sctp_conn->sub_conn[i].PMTU);
909 /* Section 7.2.1; point (5) */
910 if (sctp_conn->sub_conn[i].cwnd <= sctp_conn->sub_conn[i].ssthresh)
912 if (!cwnd_fully_utilized (sctp_conn, i))
915 if (sctp_in_cong_recovery (sctp_conn, i))
918 sctp_conn->sub_conn[i].cwnd =
919 clib_min (sctp_conn->sub_conn[i].PMTU, 1);
925 * fd.io coding-style-patch-verification: ON
928 * eval: (c-set-style "gnu")