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 32
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 typedef struct _sctp_sub_connection
94 transport_connection_t connection; /**< Common transport data. First! */
95 void *parent; /**< Link to the parent-super connection */
97 u32 error_count; /**< The current error count for this destination. */
98 u32 error_threshold; /**< Current error threshold for this destination,
99 i.e. what value marks the destination down if error count reaches this value. */
100 u32 cwnd; /**< The current congestion window. */
101 u32 ssthresh; /**< The current ssthresh value. */
103 u32 rtt_ts; /**< USED to hold the timestamp of when the packet has been sent */
105 u32 RTO; /**< The current retransmission timeout value. */
106 u32 SRTT; /**< The current smoothed round-trip time. */
107 f32 RTTVAR; /**< The current RTT variation. */
109 u32 partially_acked_bytes; /**< The tracking method for increase of cwnd when in
110 congestion avoidance mode (see Section 7.2.2).*/
112 u8 state; /**< The current state of this destination, i.e., DOWN, UP, ALLOW-HB, NO-HEARTBEAT, etc. */
114 u16 PMTU; /**< The current known path MTU. */
116 u32 timers[SCTP_N_TIMERS]; /**< A timer used by each destination. */
118 u8 RTO_pending; /**< A flag used to track if one of the DATA chunks sent to
119 this address is currently being used to compute an RTT.
120 If this flag is 0, the next DATA chunk sent to this destination
121 should be used to compute an RTT and this flag should be set.
122 Every time the RTT calculation completes (i.e., the DATA chunk is SACK'd),
125 u32 last_time; /**< The time to which this destination was last sent a packet to.
126 This can be used to determine if a HEARTBEAT is needed. */
128 u8 unacknowledged_hb; /**< Used to track how many unacknowledged heartbeats we had;
129 If more than Max.Retransmit then connetion is considered unreachable. */
131 } sctp_sub_connection_t;
135 u32 a_rwnd; /**< Maximum segment size advertised */
139 /* Useful macros to deal with the out_of_order_map (array of bit) */
140 #define SET_BIT(A,k) ( A[(k/32)] |= (1 << (k%32)) )
141 #define CLEAR_BIT(A,k) ( A[(k/32)] &= ~(1 << (k%32)) )
142 #define TEST_BIT(A,k) ( A[(k/32)] & (1 << (k%32)) )
145 _bytes_swap (void *pv, size_t n)
149 for (lo = 0, hi = n - 1; hi > lo; lo++, hi--)
157 #define ENDIANESS_SWAP(x) _bytes_swap(&x, sizeof(x));
159 #define MAX_INFLIGHT_PACKETS 128
160 #define MAX_ENQUEABLE_SACKS 2
162 /* This parameter indicates to the receiver how much increment in
163 * milliseconds the sender wishes the receiver to add to its default
166 #define SUGGESTED_COOKIE_LIFE_SPAN_INCREMENT 1000
168 typedef struct _sctp_connection
170 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
172 u8 state; /**< SCTP state as per sctp_state_t */
173 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
175 u32 local_tag; /**< INIT_TAG generated locally */
176 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
178 u32 local_initial_tsn; /**< Initial TSN generated locally */
179 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
181 u32 peer_cookie_life_span_increment;
183 u32 overall_err_count; /**< The overall association error count. */
184 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
185 reaches will cause this association to be torn down. */
187 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
189 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
190 This is sent in the INIT or INIT ACK chunk to the peer
191 and incremented each time a DATA chunk is assigned a
192 TSN (normally just prior to transmit or during
195 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
197 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
198 is set initially by taking the peer's initial TSN,
199 received in the INIT or INIT ACK chunk, and
200 subtracting one from it. */
202 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
203 TSNs have been received (relative to the Last Rcvd TSN).
204 If no gaps exist, i.e., no out-of-order packets have been received,
205 this array will be set to all zero. */
207 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
208 This is initialized to 0. When a packet is received it is incremented.
209 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
210 Note: This is used only when no DATA chunks are received out-of-order.
211 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
213 u32 a_rwnd; /** This value represents the dedicated buffer space, in number of bytes,
214 the sender of the INIT has reserved in association with this window.
215 During the life of the association, this buffer space SHOULD NOT be lessened
216 (i.e., dedicated buffers taken away from this association);
217 however, an endpoint MAY change the value of a_rwnd it sends in SACK chunks. */
219 u32 smallest_PMTU; /** The smallest PMTU discovered for all of the peer's transport addresses. */
221 u32 rcv_a_rwnd; /**< LOCAL max seg size that includes options. To be updated by congestion algos, etc. */
222 u32 snd_a_rwnd; /**< REMOTE max seg size that includes options. To be updated if peer pushes back on window, etc.*/
224 u8 overall_sending_status; /**< 0 indicates first fragment of a user message
225 1 indicates normal stream
226 2 indicates last fragment of a user message */
228 sctp_options_t rcv_opts;
229 sctp_options_t snd_opts;
231 u32 snd_hdr_length; /**< BASE HEADER LENGTH for the DATA chunk when sending */
232 u8 next_avail_sub_conn; /**< Represent the index of the next free slot in sub_conn */
236 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
238 sctp_connection_t *sctp_connection_new (u8 thread_index);
239 void sctp_sub_connection_add_ip4 (u8 thread_index,
240 sctp_ipv4_addr_param_t * ipv4_addr);
241 void sctp_sub_connection_add_ip6 (u8 thread_index,
242 sctp_ipv6_addr_param_t * ipv6_addr);
243 void sctp_connection_close (sctp_connection_t * sctp_conn);
244 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
245 void sctp_connection_del (sctp_connection_t * sctp_conn);
247 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
248 void sctp_send_init (sctp_connection_t * sctp_conn);
249 void sctp_send_shutdown (sctp_connection_t * sctp_conn);
250 void sctp_send_shutdown_ack (sctp_connection_t * sctp_conn,
252 void sctp_send_shutdown_complete (sctp_connection_t * sctp_conn);
253 void sctp_send_heartbeat (sctp_connection_t * sctp_conn);
254 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
256 void sctp_flush_frames_to_output (u8 thread_index);
257 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
259 format_function_t format_sctp_state;
261 u8 *format_sctp_connection_id (u8 * s, va_list * args);
262 u8 *format_sctp_connection (u8 * s, va_list * args);
263 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
264 u8 *format_sctp_header (u8 * s, va_list * args);
265 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
267 clib_error_t *sctp_init (vlib_main_t * vm);
268 void sctp_connection_timers_init (sctp_connection_t * tc);
269 void sctp_connection_timers_reset (sctp_connection_t * tc);
270 void sctp_init_snd_vars (sctp_connection_t * tc);
271 void sctp_init_mss (sctp_connection_t * tc);
273 void sctp_prepare_initack_chunk (sctp_connection_t * ts, vlib_buffer_t * b,
274 ip4_address_t * ip4_addr,
275 ip6_address_t * ip6_addr);
276 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * tc,
278 sctp_state_cookie_param_t * sc);
279 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * tc,
281 void sctp_prepare_sack_chunk (sctp_connection_t * tc, vlib_buffer_t * b);
282 void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn,
285 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * tc);
287 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
288 #define STHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
289 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
290 #define SCTP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
291 #define SCTP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
292 #define SCTP_MAX_OPTION_SPACE 40
294 #define SCTP_DUPACK_THRESHOLD 3
295 #define SCTP_MAX_RX_FIFO_SIZE 4 << 20
296 #define SCTP_MIN_RX_FIFO_SIZE 4 << 10
297 #define SCTP_IW_N_SEGMENTS 10
298 #define SCTP_ALWAYS_ACK 1 /**< On/off delayed acks */
299 #define SCTP_USE_SACKS 1 /**< Disable only for testing */
301 #define IP_PROTOCOL_SCTP 132
303 /** SSCTP FSM state definitions as per RFC4960. */
304 #define foreach_sctp_fsm_state \
305 _(CLOSED, "CLOSED") \
306 _(COOKIE_WAIT, "COOKIE_WAIT") \
307 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
308 _(ESTABLISHED, "ESTABLISHED") \
309 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
310 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
311 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
312 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
314 typedef enum _sctp_state
316 #define _(sym, str) SCTP_STATE_##sym,
317 foreach_sctp_fsm_state
323 sctp_state_to_string (u8 state)
327 case SCTP_STATE_CLOSED:
328 return "SCTP_STATE_CLOSED";
329 case SCTP_STATE_COOKIE_WAIT:
330 return "SCTP_STATE_COOKIE_WAIT";
331 case SCTP_STATE_COOKIE_ECHOED:
332 return "SCTP_STATE_COOKIE_ECHOED";
333 case SCTP_STATE_ESTABLISHED:
334 return "SCTP_STATE_ESTABLISHED";
335 case SCTP_STATE_SHUTDOWN_PENDING:
336 return "SCTP_STATE_SHUTDOWN_PENDING";
337 case SCTP_STATE_SHUTDOWN_SENT:
338 return "SCTP_STATE_SHUTDOWN_SENT";
339 case SCTP_STATE_SHUTDOWN_RECEIVED:
340 return "SCTP_STATE_SHUTDOWN_RECEIVED";
341 case SCTP_STATE_SHUTDOWN_ACK_SENT:
342 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
348 sctp_chunk_to_string (u8 type)
363 return "HEARTBEAT_ACK";
369 return "SHUTDOWN_ACK";
370 case OPERATION_ERROR:
371 return "OPERATION_ERROR";
373 return "COOKIE_ECHO";
380 case SHUTDOWN_COMPLETE:
381 return "SHUTDOWN_COMPLETE";
387 sctp_optparam_type_to_string (u8 type)
391 case SCTP_IPV4_ADDRESS_TYPE:
392 return "SCTP_IPV4_ADDRESS_TYPE";
393 case SCTP_IPV6_ADDRESS_TYPE:
394 return "SCTP_IPV6_ADDRESS_TYPE";
395 case SCTP_STATE_COOKIE_TYPE:
396 return "SCTP_STATE_COOKIE_TYPE";
397 case SCTP_UNRECOGNIZED_TYPE:
398 return "SCTP_UNRECOGNIZED_TYPE";
399 case SCTP_COOKIE_PRESERVATIVE_TYPE:
400 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
401 case SCTP_HOSTNAME_ADDRESS_TYPE:
402 return "SCTP_HOSTNAME_ADDRESS_TYPE";
403 case SCTP_SUPPORTED_ADDRESS_TYPES:
404 return "SCTP_SUPPORTED_ADDRESS_TYPES";
409 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
410 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
412 /* As per RFC4960, page 83 */
413 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
414 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
415 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
416 #define SCTP_RTO_BURST 4
417 #define SCTP_RTO_ALPHA 1/8
418 #define SCTP_RTO_BETA 1/4
419 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
420 #define SCTP_ASSOCIATION_MAX_RETRANS 10
422 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
424 typedef struct _sctp_lookup_dispatch
427 } sctp_lookup_dispatch_t;
429 typedef struct _sctp_main
431 /* Per-worker thread SCTP connection pools */
432 sctp_connection_t **connections;
434 /* Pool of listeners. */
435 sctp_connection_t *listener_pool;
437 /** Dispatch table by state and flags */
438 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
440 u8 log2_tstamp_clocks_per_tick;
441 f64 tstamp_ticks_per_clock;
444 /** per-worker tx buffer free lists */
446 /** per-worker tx frames to SCTP 4/6 output nodes */
447 vlib_frame_t **tx_frames[2];
448 /** per-worker tx frames to ip 4/6 lookup nodes */
449 vlib_frame_t **ip_lookup_tx_frames[2];
451 /* Per worker-thread timer wheel for connections timers */
452 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
454 /* Pool of half-open connections on which we've sent a SYN */
455 sctp_connection_t *half_open_connections;
456 clib_spinlock_t half_open_lock;
458 /* TODO: Congestion control algorithms registered */
459 /* sctp_cc_algorithm_t *cc_algos; */
461 /* Flag that indicates if stack is on or off */
464 /** Number of preallocated connections */
465 u32 preallocated_connections;
467 /** Transport table (preallocation) size parameters */
468 u32 local_endpoints_table_memory;
469 u32 local_endpoints_table_buckets;
471 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
472 ip4_address_t *ip4_src_addresses;
473 u32 last_v4_address_rotor;
474 u32 last_v6_address_rotor;
475 ip6_address_t *ip6_src_addresses;
477 /** vlib buffer size */
478 u32 bytes_per_buffer;
485 extern sctp_main_t sctp_main;
486 extern vlib_node_registration_t sctp4_input_node;
487 extern vlib_node_registration_t sctp6_input_node;
488 extern vlib_node_registration_t sctp4_output_node;
489 extern vlib_node_registration_t sctp6_output_node;
491 always_inline sctp_main_t *
492 vnet_get_sctp_main ()
497 always_inline sctp_header_t *
498 sctp_buffer_hdr (vlib_buffer_t * b)
500 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
501 return (sctp_header_t *) (b->data + b->current_data
502 + vnet_buffer (b)->sctp.hdr_offset);
505 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
507 always_inline sctp_connection_t *
508 sctp_half_open_connection_get (u32 conn_index)
510 sctp_connection_t *tc = 0;
511 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
512 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
513 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
514 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = tc;
515 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
520 * Cleanup half-open connection
524 sctp_half_open_connection_del (sctp_connection_t * tc)
526 sctp_main_t *tm = vnet_get_sctp_main ();
527 clib_spinlock_lock_if_init (&tm->half_open_lock);
528 pool_put_index (tm->half_open_connections,
529 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_c_index);
531 memset (tc, 0xFA, sizeof (*tc));
532 clib_spinlock_unlock_if_init (&tm->half_open_lock);
536 sctp_set_time_now (u32 thread_index)
538 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
539 * sctp_main.tstamp_ticks_per_clock;
540 return sctp_main.time_now[thread_index];
544 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
547 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
548 vlib_get_thread_index ());
549 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
550 SCTP_TIMER_HANDLE_INVALID);
552 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
553 sub->timers[timer_id] =
554 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
555 sub->c_c_index, timer_id, interval);
559 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
561 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
562 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
565 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
567 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
568 sub->timers[timer_id]);
569 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
573 * Try to cleanup half-open connection
575 * If called from a thread that doesn't own tc, the call won't have any
578 * @param tc - connection to be cleaned up
579 * @return non-zero if cleanup failed.
582 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
584 /* Make sure this is the owning thread */
585 if (tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_thread_index !=
586 vlib_get_thread_index ())
588 sctp_timer_reset (tc, MAIN_SCTP_SUB_CONN_IDX, SCTP_TIMER_T1_INIT);
589 sctp_half_open_connection_del (tc);
596 return sizeof (sctp_header_t);
599 always_inline sctp_connection_t *
600 sctp_get_connection_from_transport (transport_connection_t * tconn)
602 ASSERT (tconn != NULL);
604 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
607 SCTP_ADV_DBG ("sub == NULL");
608 if (sub->parent == NULL)
609 SCTP_ADV_DBG ("sub->parent == NULL");
611 return (sctp_connection_t *) sub->parent;
617 return sctp_main.time_now[vlib_get_thread_index ()];
620 #define ABS(x) ((x) > 0) ? (x) : -(x);
623 sctp_calculate_rto (sctp_connection_t * sctp_conn, u8 conn_idx)
625 /* See RFC4960, 6.3.1. RTO Calculation */
628 u32 now = sctp_time_now ();
629 u32 prev_ts = sctp_conn->sub_conn[conn_idx].rtt_ts;
630 u32 R = prev_ts - now;
632 if (sctp_conn->sub_conn[conn_idx].RTO == 0) // C1: Let's initialize our RTO
634 sctp_conn->sub_conn[conn_idx].RTO = SCTP_RTO_MIN;
638 if (sctp_conn->sub_conn[conn_idx].RTO == SCTP_RTO_MIN && sctp_conn->sub_conn[conn_idx].SRTT == 0) // C2: First RTT calculation
640 sctp_conn->sub_conn[conn_idx].SRTT = R;
644 RTTVAR = 100e-3; /* 100 ms */
646 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
648 else // C3: RTT already exists; let's recalculate
650 RTTVAR = (1 - SCTP_RTO_BETA) * sctp_conn->sub_conn[conn_idx].RTTVAR +
651 SCTP_RTO_BETA * ABS (sctp_conn->sub_conn[conn_idx].SRTT - R);
654 RTTVAR = 100e-3; /* 100 ms */
656 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
658 sctp_conn->sub_conn[conn_idx].SRTT =
659 (1 - SCTP_RTO_ALPHA) * sctp_conn->sub_conn[conn_idx].SRTT +
664 sctp_conn->sub_conn[conn_idx].SRTT +
665 4 * sctp_conn->sub_conn[conn_idx].RTTVAR;
666 if (RTO < SCTP_RTO_MIN) // C6
669 if (RTO > SCTP_RTO_MAX) // C7
672 sctp_conn->sub_conn[conn_idx].RTO = RTO;
676 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
679 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
680 vlib_get_thread_index ());
681 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
683 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
684 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
685 sub->timers[timer_id]);
687 tc->sub_conn[conn_idx].timers[timer_id] =
688 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
689 sub->c_c_index, timer_id, interval);
692 always_inline sctp_connection_t *
693 sctp_listener_get (u32 tli)
695 return pool_elt_at_index (sctp_main.listener_pool, tli);
700 always_inline sctp_connection_t *
701 sctp_connection_get (u32 conn_index, u32 thread_index)
704 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
706 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
710 sctp_pick_conn_idx_on_chunk (sctp_chunk_type chunk_type)
712 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
725 case OPERATION_ERROR:
730 case SHUTDOWN_COMPLETE:
731 idx = MAIN_SCTP_SUB_CONN_IDX;
737 sctp_pick_conn_idx_on_state (sctp_state_t state)
739 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
743 case SCTP_STATE_CLOSED:
744 case SCTP_STATE_COOKIE_WAIT:
745 case SCTP_STATE_COOKIE_ECHOED:
746 case SCTP_STATE_ESTABLISHED:
747 case SCTP_STATE_SHUTDOWN_PENDING:
748 case SCTP_STATE_SHUTDOWN_SENT:
749 case SCTP_STATE_SHUTDOWN_RECEIVED:
750 case SCTP_STATE_SHUTDOWN_ACK_SENT:
751 idx = MAIN_SCTP_SUB_CONN_IDX;
753 idx = MAIN_SCTP_SUB_CONN_IDX;
759 * Push SCTP header to buffer
761 * @param vm - vlib_main
762 * @param b - buffer to write the header to
763 * @param sp_net - source port net order
764 * @param dp_net - destination port net order
765 * @param sctp_hdr_opts_len - header and options length in bytes
767 * @return - pointer to start of SCTP header
770 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
771 u8 sctp_hdr_opts_len)
773 sctp_full_hdr_t *full_hdr;
775 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
777 full_hdr->hdr.src_port = sp;
778 full_hdr->hdr.dst_port = dp;
779 full_hdr->hdr.checksum = 0;
784 * Push SCTP header to buffer
786 * @param b - buffer to write the header to
787 * @param sp_net - source port net order
788 * @param dp_net - destination port net order
789 * @param sctp_hdr_opts_len - header and options length in bytes
791 * @return - pointer to start of SCTP header
794 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
795 u8 sctp_hdr_opts_len)
797 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
802 * fd.io coding-style-patch-verification: ON
805 * eval: (c-set-style "gnu")