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 SCTP_PRIMARY_PATH_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,
97 SCTP_SUBCONN_AWAITING_SACK,
98 SCTP_SUBCONN_SACK_RECEIVED
101 #define SCTP_INITIAL_SSHTRESH 65535
102 typedef struct _sctp_sub_connection
104 transport_connection_t connection; /**< Common transport data. First! */
106 u8 subconn_idx; /**< This indicates the position of this sub-connection in the super-set container of connections pool */
107 u32 error_count; /**< The current error count for this destination. */
108 u32 error_threshold; /**< Current error threshold for this destination,
109 i.e. what value marks the destination down if error count reaches this value. */
110 u32 cwnd; /**< Congestion control window (cwnd, in bytes), which is adjusted by
111 the sender based on observed network conditions. */
112 u32 ssthresh; /**< Slow-start threshold (in bytes), which is used by the
113 sender to distinguish slow-start and congestion avoidance phases. */
115 u32 rtt_ts; /**< USED to hold the timestamp of when the packet has been sent */
117 u32 RTO; /**< The current retransmission timeout value. */
118 u32 SRTT; /**< The current smoothed round-trip time. */
119 f32 RTTVAR; /**< The current RTT variation. */
121 u32 partially_acked_bytes; /**< The tracking method for increase of cwnd when in
122 congestion avoidance mode (see Section 7.2.2).*/
124 u8 state; /**< The current state of this destination, i.e., DOWN, UP, ALLOW-HB, NO-HEARTBEAT, etc. */
126 u16 PMTU; /**< The current known path MTU. */
128 u32 timers[SCTP_N_TIMERS]; /**< A timer used by each destination. */
130 u8 RTO_pending; /**< A flag used to track if one of the DATA chunks sent to
131 this address is currently being used to compute an RTT.
132 If this flag is 0, the next DATA chunk sent to this destination
133 should be used to compute an RTT and this flag should be set.
134 Every time the RTT calculation completes (i.e., the DATA chunk is SACK'd),
137 u32 last_seen; /**< The time to which this destination was last sent a packet to.
138 This can be used to determine if a HEARTBEAT is needed. */
140 u32 last_data_ts; /**< Used to hold the timestamp value of last time we sent a DATA chunk */
142 u8 unacknowledged_hb; /**< Used to track how many unacknowledged heartbeats we had;
143 If more than SCTP_PATH_MAX_RETRANS then connection is considered unreachable. */
145 u8 is_retransmitting; /**< A flag (0 = no, 1 = yes) indicating whether the connection is retransmitting a previous packet */
147 u8 enqueue_state; /**< if set to 1 indicates that DATA is still being handled hence cannot shutdown this connection yet */
149 } sctp_sub_connection_t;
153 u32 a_rwnd; /**< Maximum segment size advertised */
157 /* Useful macros to deal with the out_of_order_map (array of bit) */
158 #define SET_BIT(A,k) ( A[(k/32)] |= (1 << (k%32)) )
159 #define CLEAR_BIT(A,k) ( A[(k/32)] &= ~(1 << (k%32)) )
160 #define TEST_BIT(A,k) ( A[(k/32)] & (1 << (k%32)) )
163 _bytes_swap (void *pv, size_t n)
167 for (lo = 0, hi = n - 1; hi > lo; lo++, hi--)
175 #define ENDIANESS_SWAP(x) _bytes_swap(&x, sizeof(x));
177 #define MAX_INFLIGHT_PACKETS 128
178 #define MAX_ENQUEABLE_SACKS 2
180 /* This parameter indicates to the receiver how much increment in
181 * milliseconds the sender wishes the receiver to add to its default
184 #define SUGGESTED_COOKIE_LIFE_SPAN_INCREMENT 1000
186 typedef struct _sctp_user_configuration
191 } sctp_user_configuration_t;
193 typedef struct _sctp_connection
195 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
196 sctp_user_configuration_t conn_config; /**< Allows tuning of some SCTP behaviors */
198 u8 state; /**< SCTP state as per sctp_state_t */
199 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
201 u32 local_tag; /**< INIT_TAG generated locally */
202 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
204 u32 local_initial_tsn; /**< Initial TSN generated locally */
205 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
207 u32 peer_cookie_life_span_increment;
209 u32 overall_err_count; /**< The overall association error count. */
210 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
211 reaches will cause this association to be torn down. */
213 u8 init_retransmit_err; /**< Error counter for the INIT transmission phase */
215 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
217 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
218 This is sent in the INIT or INIT ACK chunk to the peer
219 and incremented each time a DATA chunk is assigned a
220 TSN (normally just prior to transmit or during
223 u32 last_unacked_tsn; /** < Last TSN number still unacked */
224 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
226 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
227 is set initially by taking the peer's initial TSN,
228 received in the INIT or INIT ACK chunk, and
229 subtracting one from it. */
231 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
232 TSNs have been received (relative to the Last Rcvd TSN).
233 If no gaps exist, i.e., no out-of-order packets have been received,
234 this array will be set to all zero. */
236 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
237 This is initialized to 0. When a packet is received it is incremented.
238 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
239 Note: This is used only when no DATA chunks are received out-of-order.
240 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
242 u8 smallest_PMTU_idx; /** The index of the sub-connection with the smallest PMTU discovered across all peer's transport addresses. */
244 u8 overall_sending_status; /**< 0 indicates first fragment of a user message
245 1 indicates normal stream
246 2 indicates last fragment of a user message */
248 u8 forming_association_changed; /**< This is a flag indicating whether the original association has been modified during
249 the life-span of the association itself. For instance, a new sub-connection might have been added. */
251 sctp_state_cookie_param_t cookie_param; /**< Temporary location to save cookie information; it can be used to
252 when timeout expires and sending again a COOKIE is require. */
256 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
258 sctp_connection_t *sctp_connection_new (u8 thread_index);
261 sctp_sub_connection_add_ip4 (vlib_main_t * vm,
262 ip4_address_t * lcl_addr,
263 ip4_address_t * rmt_addr);
266 sctp_sub_connection_add_ip6 (vlib_main_t * vm,
267 ip6_address_t * lcl_addr,
268 ip6_address_t * rmt_addr);
271 sctp_sub_connection_del_ip4 (ip4_address_t * lcl_addr,
272 ip4_address_t * rmt_addr);
275 sctp_sub_connection_del_ip6 (ip6_address_t * lcl_addr,
276 ip6_address_t * rmt_addr);
278 u8 sctp_configure (sctp_user_configuration_t config);
280 void sctp_connection_close (sctp_connection_t * sctp_conn);
281 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
282 void sctp_connection_del (sctp_connection_t * sctp_conn);
284 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
285 void sctp_send_init (sctp_connection_t * sctp_conn);
286 void sctp_send_cookie_echo (sctp_connection_t * sctp_conn);
287 void sctp_send_shutdown (sctp_connection_t * sctp_conn);
288 void sctp_send_shutdown_ack (sctp_connection_t * sctp_conn, u8 idx,
290 void sctp_send_shutdown_complete (sctp_connection_t * sctp_conn, u8 idx,
292 void sctp_send_heartbeat (sctp_connection_t * sctp_conn);
293 void sctp_data_retransmit (sctp_connection_t * sctp_conn);
294 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
296 void sctp_flush_frames_to_output (u8 thread_index);
297 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
299 format_function_t format_sctp_state;
301 u8 *format_sctp_connection_id (u8 * s, va_list * args);
302 u8 *format_sctp_connection (u8 * s, va_list * args);
303 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
304 u8 *format_sctp_header (u8 * s, va_list * args);
305 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
307 clib_error_t *sctp_init (vlib_main_t * vm);
308 void sctp_connection_timers_init (sctp_connection_t * sctp_conn);
309 void sctp_connection_timers_reset (sctp_connection_t * sctp_conn);
310 void sctp_init_snd_vars (sctp_connection_t * sctp_conn);
311 void sctp_init_mss (sctp_connection_t * sctp_conn);
313 void sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, u8 idx,
314 vlib_buffer_t * b, ip4_address_t * ip4_addr,
315 u8 add_ip4, ip6_address_t * ip6_addr,
317 void sctp_prepare_initack_chunk_for_collision (sctp_connection_t * sctp_conn,
318 u8 idx, vlib_buffer_t * b,
319 ip4_address_t * ip4_addr,
320 ip6_address_t * ip6_addr);
321 void sctp_prepare_abort_for_collision (sctp_connection_t * sctp_conn, u8 idx,
323 ip4_address_t * ip4_addr,
324 ip6_address_t * ip6_addr);
325 void sctp_prepare_operation_error (sctp_connection_t * sctp_conn, u8 idx,
326 vlib_buffer_t * b, u8 err_cause);
327 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn, u8 idx,
328 vlib_buffer_t * b, u8 reuse_buffer);
329 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
331 void sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, u8 idx,
333 void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
336 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * sctp_conn);
338 void sctp_api_reference (void);
340 #define IP_PROTOCOL_SCTP 132
342 /** SSCTP FSM state definitions as per RFC4960. */
343 #define foreach_sctp_fsm_state \
344 _(CLOSED, "CLOSED") \
345 _(COOKIE_WAIT, "COOKIE_WAIT") \
346 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
347 _(ESTABLISHED, "ESTABLISHED") \
348 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
349 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
350 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
351 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
353 typedef enum _sctp_state
355 #define _(sym, str) SCTP_STATE_##sym,
356 foreach_sctp_fsm_state
362 sctp_state_to_string (u8 state)
366 case SCTP_STATE_CLOSED:
367 return "SCTP_STATE_CLOSED";
368 case SCTP_STATE_COOKIE_WAIT:
369 return "SCTP_STATE_COOKIE_WAIT";
370 case SCTP_STATE_COOKIE_ECHOED:
371 return "SCTP_STATE_COOKIE_ECHOED";
372 case SCTP_STATE_ESTABLISHED:
373 return "SCTP_STATE_ESTABLISHED";
374 case SCTP_STATE_SHUTDOWN_PENDING:
375 return "SCTP_STATE_SHUTDOWN_PENDING";
376 case SCTP_STATE_SHUTDOWN_SENT:
377 return "SCTP_STATE_SHUTDOWN_SENT";
378 case SCTP_STATE_SHUTDOWN_RECEIVED:
379 return "SCTP_STATE_SHUTDOWN_RECEIVED";
380 case SCTP_STATE_SHUTDOWN_ACK_SENT:
381 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
387 sctp_chunk_to_string (u8 type)
402 return "HEARTBEAT_ACK";
408 return "SHUTDOWN_ACK";
409 case OPERATION_ERROR:
410 return "OPERATION_ERROR";
412 return "COOKIE_ECHO";
419 case SHUTDOWN_COMPLETE:
420 return "SHUTDOWN_COMPLETE";
426 sctp_optparam_type_to_string (u8 type)
430 case SCTP_IPV4_ADDRESS_TYPE:
431 return "SCTP_IPV4_ADDRESS_TYPE";
432 case SCTP_IPV6_ADDRESS_TYPE:
433 return "SCTP_IPV6_ADDRESS_TYPE";
434 case SCTP_STATE_COOKIE_TYPE:
435 return "SCTP_STATE_COOKIE_TYPE";
436 case SCTP_UNRECOGNIZED_TYPE:
437 return "SCTP_UNRECOGNIZED_TYPE";
438 case SCTP_COOKIE_PRESERVATIVE_TYPE:
439 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
440 case SCTP_HOSTNAME_ADDRESS_TYPE:
441 return "SCTP_HOSTNAME_ADDRESS_TYPE";
442 case SCTP_SUPPORTED_ADDRESS_TYPES:
443 return "SCTP_SUPPORTED_ADDRESS_TYPES";
448 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
449 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
450 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
452 /* As per RFC4960, page 83 */
453 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
454 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
455 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
456 #define SCTP_RTO_BURST 4
457 #define SCTP_RTO_ALPHA 1/8
458 #define SCTP_RTO_BETA 1/4
459 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
460 #define SCTP_ASSOCIATION_MAX_RETRANS 10 // the overall connection
461 #define SCTP_PATH_MAX_RETRANS 5 // number of attempts per destination address
462 #define SCTP_MAX_INIT_RETRANS 8 // number of attempts
463 #define SCTP_HB_INTERVAL 30 * SHZ
464 #define SCTP_HB_MAX_BURST 1
465 #define SCTP_DATA_IDLE_INTERVAL 15 * SHZ /* 15 seconds; the time-interval after which the connetion is considered IDLE */
466 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
468 #define SCTP_CONN_RECOVERY 1 << 1
469 #define SCTP_FAST_RECOVERY 1 << 2
471 typedef struct _sctp_lookup_dispatch
474 } sctp_lookup_dispatch_t;
476 typedef struct _sctp_main
478 /* Per-worker thread SCTP connection pools */
479 sctp_connection_t **connections;
481 /* Pool of listeners. */
482 sctp_connection_t *listener_pool;
484 /** Dispatch table by state and flags */
485 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
487 u8 log2_tstamp_clocks_per_tick;
488 f64 tstamp_ticks_per_clock;
491 /** per-worker tx buffer free lists */
493 /** per-worker tx frames to SCTP 4/6 output nodes */
494 vlib_frame_t **tx_frames[2];
495 /** per-worker tx frames to ip 4/6 lookup nodes */
496 vlib_frame_t **ip_lookup_tx_frames[2];
498 /* Per worker-thread timer wheel for connections timers */
499 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
501 /* Pool of half-open connections on which we've sent a SYN */
502 sctp_connection_t *half_open_connections;
503 clib_spinlock_t half_open_lock;
505 /* TODO: Congestion control algorithms registered */
506 /* sctp_cc_algorithm_t *cc_algos; */
508 /* Flag that indicates if stack is on or off */
511 /** Number of preallocated connections */
512 u32 preallocated_connections;
514 /** Transport table (preallocation) size parameters */
515 u32 local_endpoints_table_memory;
516 u32 local_endpoints_table_buckets;
518 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
519 ip4_address_t *ip4_src_addresses;
520 u32 last_v4_address_rotor;
521 u32 last_v6_address_rotor;
522 ip6_address_t *ip6_src_addresses;
524 /** vlib buffer size */
525 u32 bytes_per_buffer;
532 extern sctp_main_t sctp_main;
533 extern vlib_node_registration_t sctp4_input_node;
534 extern vlib_node_registration_t sctp6_input_node;
535 extern vlib_node_registration_t sctp4_output_node;
536 extern vlib_node_registration_t sctp6_output_node;
538 always_inline sctp_main_t *
539 vnet_get_sctp_main ()
544 always_inline sctp_header_t *
545 sctp_buffer_hdr (vlib_buffer_t * b)
547 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
548 return (sctp_header_t *) (b->data + b->current_data
549 + vnet_buffer (b)->sctp.hdr_offset);
552 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
554 always_inline sctp_connection_t *
555 sctp_half_open_connection_get (u32 conn_index)
557 sctp_connection_t *tc = 0;
558 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
559 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
560 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
561 tc->sub_conn[SCTP_PRIMARY_PATH_IDX].subconn_idx = SCTP_PRIMARY_PATH_IDX;
562 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
567 * Cleanup half-open connection
571 sctp_half_open_connection_del (sctp_connection_t * tc)
573 sctp_main_t *sctp_main = vnet_get_sctp_main ();
574 clib_spinlock_lock_if_init (&sctp_main->half_open_lock);
575 pool_put_index (sctp_main->half_open_connections,
576 tc->sub_conn[SCTP_PRIMARY_PATH_IDX].c_c_index);
578 memset (tc, 0xFA, sizeof (*tc));
579 clib_spinlock_unlock_if_init (&sctp_main->half_open_lock);
583 sctp_set_time_now (u32 thread_index)
585 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
586 * sctp_main.tstamp_ticks_per_clock;
587 return sctp_main.time_now[thread_index];
591 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
594 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
595 vlib_get_thread_index ());
596 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
597 SCTP_TIMER_HANDLE_INVALID);
599 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
600 sub->timers[timer_id] =
601 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
602 sub->c_c_index, timer_id, interval);
606 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
608 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
609 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
612 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
614 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
615 sub->timers[timer_id]);
616 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
620 * Try to cleanup half-open connection
622 * If called from a thread that doesn't own tc, the call won't have any
625 * @param tc - connection to be cleaned up
626 * @return non-zero if cleanup failed.
629 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
631 /* Make sure this is the owning thread */
632 if (tc->sub_conn[SCTP_PRIMARY_PATH_IDX].c_thread_index !=
633 vlib_get_thread_index ())
635 sctp_timer_reset (tc, SCTP_PRIMARY_PATH_IDX, SCTP_TIMER_T1_INIT);
636 sctp_half_open_connection_del (tc);
643 return sizeof (sctp_header_t);
646 always_inline sctp_connection_t *
647 sctp_get_connection_from_transport (transport_connection_t * tconn)
649 ASSERT (tconn != NULL);
651 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
654 SCTP_ADV_DBG ("sub == NULL");
655 if (sub->parent == NULL)
656 SCTP_ADV_DBG ("sub->parent == NULL");
658 if (sub->subconn_idx > 0)
659 return (sctp_connection_t *) sub -
660 (sizeof (sctp_sub_connection_t) * (sub->subconn_idx - 1));
662 return (sctp_connection_t *) sub;
668 return sctp_main.time_now[vlib_get_thread_index ()];
671 #define ABS(x) ((x) > 0) ? (x) : -(x);
674 sctp_calculate_rto (sctp_connection_t * sctp_conn, u8 conn_idx)
676 /* See RFC4960, 6.3.1. RTO Calculation */
679 u32 now = sctp_time_now ();
680 u32 prev_ts = sctp_conn->sub_conn[conn_idx].rtt_ts;
681 u32 R = prev_ts - now;
683 if (sctp_conn->sub_conn[conn_idx].RTO == 0) // C1: Let's initialize our RTO
685 sctp_conn->sub_conn[conn_idx].RTO = SCTP_RTO_MIN;
689 if (sctp_conn->sub_conn[conn_idx].RTO == SCTP_RTO_MIN && sctp_conn->sub_conn[conn_idx].SRTT == 0) // C2: First RTT calculation
691 sctp_conn->sub_conn[conn_idx].SRTT = R;
695 RTTVAR = 100e-3; /* 100 ms */
697 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
699 else // C3: RTT already exists; let's recalculate
701 RTTVAR = (1 - SCTP_RTO_BETA) * sctp_conn->sub_conn[conn_idx].RTTVAR +
702 SCTP_RTO_BETA * ABS (sctp_conn->sub_conn[conn_idx].SRTT - R);
705 RTTVAR = 100e-3; /* 100 ms */
707 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
709 sctp_conn->sub_conn[conn_idx].SRTT =
710 (1 - SCTP_RTO_ALPHA) * sctp_conn->sub_conn[conn_idx].SRTT +
715 sctp_conn->sub_conn[conn_idx].SRTT +
716 4 * sctp_conn->sub_conn[conn_idx].RTTVAR;
717 if (RTO < SCTP_RTO_MIN) // C6
720 if (RTO > SCTP_RTO_MAX) // C7
723 sctp_conn->sub_conn[conn_idx].RTO = RTO;
727 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
730 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
731 vlib_get_thread_index ());
732 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
734 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
735 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
736 sub->timers[timer_id]);
738 tc->sub_conn[conn_idx].timers[timer_id] =
739 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
740 sub->c_c_index, timer_id, interval);
743 always_inline sctp_connection_t *
744 sctp_listener_get (u32 tli)
746 return pool_elt_at_index (sctp_main.listener_pool, tli);
751 always_inline sctp_connection_t *
752 sctp_connection_get (u32 conn_index, u32 thread_index)
755 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
757 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
760 #define SELECT_MAX_RETRIES 8
763 sctp_data_subconn_select (sctp_connection_t * sctp_conn)
765 u32 sub = SCTP_PRIMARY_PATH_IDX;
766 u8 i, cwnd = sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].cwnd;
767 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
769 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
772 if (sctp_conn->sub_conn[i].cwnd > cwnd)
775 cwnd = sctp_conn->sub_conn[i].cwnd;
782 sctp_sub_conn_id_via_ip6h (sctp_connection_t * sctp_conn, ip6_header_t * ip6h)
786 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
788 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[0] ==
789 ip6h->dst_address.as_u64[0] &&
790 sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[1] ==
791 ip6h->dst_address.as_u64[1] &&
792 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[0] ==
793 ip6h->src_address.as_u64[0] &&
794 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
795 ip6h->src_address.as_u64[1])
798 clib_warning ("Did not find a sub-connection; defaulting to %u",
799 SCTP_PRIMARY_PATH_IDX);
800 return SCTP_PRIMARY_PATH_IDX;
804 sctp_sub_conn_id_via_ip4h (sctp_connection_t * sctp_conn, ip4_header_t * ip4h)
808 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
810 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip4.as_u32 ==
811 ip4h->dst_address.as_u32
812 && sctp_conn->sub_conn[i].connection.rmt_ip.ip4.as_u32 ==
813 ip4h->src_address.as_u32)
816 clib_warning ("Did not find a sub-connection; defaulting to %u",
817 SCTP_PRIMARY_PATH_IDX);
818 return SCTP_PRIMARY_PATH_IDX;
822 * Push SCTP header to buffer
824 * @param vm - vlib_main
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_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
834 u8 sctp_hdr_opts_len)
836 sctp_full_hdr_t *full_hdr;
838 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
840 full_hdr->hdr.src_port = sp;
841 full_hdr->hdr.dst_port = dp;
842 full_hdr->hdr.checksum = 0;
847 * Push SCTP header to buffer
849 * @param b - buffer to write the header to
850 * @param sp_net - source port net order
851 * @param dp_net - destination port net order
852 * @param sctp_hdr_opts_len - header and options length in bytes
854 * @return - pointer to start of SCTP header
857 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
858 u8 sctp_hdr_opts_len)
860 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
865 sctp_next_avail_subconn (sctp_connection_t * sctp_conn)
869 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
871 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
874 return MAX_SCTP_CONNECTIONS;
878 update_smallest_pmtu_idx (sctp_connection_t * sctp_conn)
881 u8 smallest_pmtu_index = SCTP_PRIMARY_PATH_IDX;
883 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
885 if (sctp_conn->sub_conn[i].state != SCTP_SUBCONN_STATE_DOWN)
887 if (sctp_conn->sub_conn[i].PMTU <
888 sctp_conn->sub_conn[smallest_pmtu_index].PMTU)
889 smallest_pmtu_index = i;
893 sctp_conn->smallest_PMTU_idx = smallest_pmtu_index;
896 /* As per RFC4960; section 7.2.1: Slow-Start */
898 sctp_init_cwnd (sctp_connection_t * sctp_conn)
901 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
903 /* Section 7.2.1; point (1) */
904 sctp_conn->sub_conn[i].cwnd =
905 clib_min (4 * sctp_conn->sub_conn[i].PMTU,
906 clib_max (2 * sctp_conn->sub_conn[i].PMTU, 4380));
908 /* Section 7.2.1; point (3) */
909 sctp_conn->sub_conn[i].ssthresh = SCTP_INITIAL_SSHTRESH;
911 /* Section 7.2.2; point (1) */
912 sctp_conn->sub_conn[i].partially_acked_bytes = 0;
917 sctp_in_cong_recovery (sctp_connection_t * sctp_conn, u8 idx)
923 cwnd_fully_utilized (sctp_connection_t * sctp_conn, u8 idx)
925 if (sctp_conn->sub_conn[idx].cwnd == 0)
930 /* As per RFC4960; section 7.2.1: Slow-Start */
932 update_cwnd (sctp_connection_t * sctp_conn)
935 u32 inflight = sctp_conn->next_tsn - sctp_conn->last_unacked_tsn;
937 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
939 /* Section 7.2.1; point (2) */
940 if (sctp_conn->sub_conn[i].is_retransmitting)
942 sctp_conn->sub_conn[i].cwnd = 1 * sctp_conn->sub_conn[i].PMTU;
946 /* Section 7.2.2; point (4) */
947 if (sctp_conn->sub_conn[i].last_data_ts >
948 sctp_time_now () + SCTP_DATA_IDLE_INTERVAL)
950 sctp_conn->sub_conn[i].cwnd =
951 clib_max (sctp_conn->sub_conn[i].cwnd / 2,
952 4 * sctp_conn->sub_conn[i].PMTU);
956 /* Section 7.2.1; point (5) */
957 if (sctp_conn->sub_conn[i].cwnd <= sctp_conn->sub_conn[i].ssthresh)
959 if (!cwnd_fully_utilized (sctp_conn, i))
962 if (sctp_in_cong_recovery (sctp_conn, i))
965 sctp_conn->sub_conn[i].cwnd =
966 clib_min (sctp_conn->sub_conn[i].PMTU, 1);
969 /* Section 6.1; point (D) */
970 if ((inflight + SCTP_RTO_BURST * sctp_conn->sub_conn[i].PMTU) <
971 sctp_conn->sub_conn[i].cwnd)
972 sctp_conn->sub_conn[i].cwnd =
973 inflight + SCTP_RTO_BURST * sctp_conn->sub_conn[i].PMTU;
978 * fd.io coding-style-patch-verification: ON
981 * eval: (c-set-style "gnu")