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
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_user_configuration
189 } sctp_user_configuration_t;
191 typedef struct _sctp_connection
193 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
194 sctp_user_configuration_t conn_config; /**< Allows tuning of some SCTP behaviors */
196 u8 state; /**< SCTP state as per sctp_state_t */
197 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
199 u32 local_tag; /**< INIT_TAG generated locally */
200 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
202 u32 local_initial_tsn; /**< Initial TSN generated locally */
203 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
205 u32 peer_cookie_life_span_increment;
207 u32 overall_err_count; /**< The overall association error count. */
208 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
209 reaches will cause this association to be torn down. */
211 u8 init_retransmit_err; /**< Error counter for the INIT transmission phase */
213 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
215 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
216 This is sent in the INIT or INIT ACK chunk to the peer
217 and incremented each time a DATA chunk is assigned a
218 TSN (normally just prior to transmit or during
221 u32 last_unacked_tsn; /** < Last TSN number still unacked */
222 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
224 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
225 is set initially by taking the peer's initial TSN,
226 received in the INIT or INIT ACK chunk, and
227 subtracting one from it. */
229 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
230 TSNs have been received (relative to the Last Rcvd TSN).
231 If no gaps exist, i.e., no out-of-order packets have been received,
232 this array will be set to all zero. */
234 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
235 This is initialized to 0. When a packet is received it is incremented.
236 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
237 Note: This is used only when no DATA chunks are received out-of-order.
238 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
240 u8 smallest_PMTU_idx; /** The index of the sub-connection with the smallest PMTU discovered across all peer's transport addresses. */
242 u8 overall_sending_status; /**< 0 indicates first fragment of a user message
243 1 indicates normal stream
244 2 indicates last fragment of a user message */
246 u8 forming_association_changed; /**< This is a flag indicating whether the original association has been modified during
247 the life-span of the association itself. For instance, a new sub-connection might have been added. */
249 sctp_state_cookie_param_t cookie_param; /**< Temporary location to save cookie information; it can be used to
250 when timeout expires and sending again a COOKIE is require. */
254 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
256 sctp_connection_t *sctp_connection_new (u8 thread_index);
259 sctp_sub_connection_add_ip4 (vlib_main_t * vm,
260 ip4_address_t * lcl_addr,
261 ip4_address_t * rmt_addr);
264 sctp_sub_connection_add_ip6 (vlib_main_t * vm,
265 ip6_address_t * lcl_addr,
266 ip6_address_t * rmt_addr);
269 sctp_sub_connection_del_ip4 (ip4_address_t * lcl_addr,
270 ip4_address_t * rmt_addr);
273 sctp_sub_connection_del_ip6 (ip6_address_t * lcl_addr,
274 ip6_address_t * rmt_addr);
276 u8 sctp_configure (sctp_user_configuration_t config);
278 void sctp_connection_close (sctp_connection_t * sctp_conn);
279 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
280 void sctp_connection_del (sctp_connection_t * sctp_conn);
282 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
283 void sctp_send_init (sctp_connection_t * sctp_conn);
284 void sctp_send_cookie_echo (sctp_connection_t * sctp_conn);
285 void sctp_send_shutdown (sctp_connection_t * sctp_conn);
286 void sctp_send_shutdown_ack (sctp_connection_t * sctp_conn, u8 idx,
288 void sctp_send_shutdown_complete (sctp_connection_t * sctp_conn, u8 idx,
290 void sctp_send_heartbeat (sctp_connection_t * sctp_conn);
291 void sctp_data_retransmit (sctp_connection_t * sctp_conn);
292 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
294 void sctp_flush_frames_to_output (u8 thread_index);
295 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
297 format_function_t format_sctp_state;
299 u8 *format_sctp_connection_id (u8 * s, va_list * args);
300 u8 *format_sctp_connection (u8 * s, va_list * args);
301 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
302 u8 *format_sctp_header (u8 * s, va_list * args);
303 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
305 clib_error_t *sctp_init (vlib_main_t * vm);
306 void sctp_connection_timers_init (sctp_connection_t * sctp_conn);
307 void sctp_connection_timers_reset (sctp_connection_t * sctp_conn);
308 void sctp_init_snd_vars (sctp_connection_t * sctp_conn);
309 void sctp_init_mss (sctp_connection_t * sctp_conn);
311 void sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, u8 idx,
312 vlib_buffer_t * b, ip4_address_t * ip4_addr,
313 ip6_address_t * ip6_addr);
315 sctp_prepare_initack_chunk_for_collision (sctp_connection_t * sctp_conn,
316 u8 idx, vlib_buffer_t * b,
317 ip4_address_t * ip4_addr,
318 ip6_address_t * ip6_addr);
319 void sctp_prepare_abort_for_collision (sctp_connection_t * sctp_conn, u8 idx,
321 ip4_address_t * ip4_addr,
322 ip6_address_t * ip6_addr);
324 sctp_prepare_operation_error (sctp_connection_t * sctp_conn, u8 idx,
325 vlib_buffer_t * b, u8 err_cause);
326 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn, u8 idx,
327 vlib_buffer_t * b, u8 reuse_buffer);
328 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
330 void sctp_prepare_sack_chunk (sctp_connection_t * sctp_conn, u8 idx,
332 void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
335 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * sctp_conn);
337 void sctp_api_reference (void);
339 #define IP_PROTOCOL_SCTP 132
341 /** SSCTP FSM state definitions as per RFC4960. */
342 #define foreach_sctp_fsm_state \
343 _(CLOSED, "CLOSED") \
344 _(COOKIE_WAIT, "COOKIE_WAIT") \
345 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
346 _(ESTABLISHED, "ESTABLISHED") \
347 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
348 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
349 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
350 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
352 typedef enum _sctp_state
354 #define _(sym, str) SCTP_STATE_##sym,
355 foreach_sctp_fsm_state
361 sctp_state_to_string (u8 state)
365 case SCTP_STATE_CLOSED:
366 return "SCTP_STATE_CLOSED";
367 case SCTP_STATE_COOKIE_WAIT:
368 return "SCTP_STATE_COOKIE_WAIT";
369 case SCTP_STATE_COOKIE_ECHOED:
370 return "SCTP_STATE_COOKIE_ECHOED";
371 case SCTP_STATE_ESTABLISHED:
372 return "SCTP_STATE_ESTABLISHED";
373 case SCTP_STATE_SHUTDOWN_PENDING:
374 return "SCTP_STATE_SHUTDOWN_PENDING";
375 case SCTP_STATE_SHUTDOWN_SENT:
376 return "SCTP_STATE_SHUTDOWN_SENT";
377 case SCTP_STATE_SHUTDOWN_RECEIVED:
378 return "SCTP_STATE_SHUTDOWN_RECEIVED";
379 case SCTP_STATE_SHUTDOWN_ACK_SENT:
380 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
386 sctp_chunk_to_string (u8 type)
401 return "HEARTBEAT_ACK";
407 return "SHUTDOWN_ACK";
408 case OPERATION_ERROR:
409 return "OPERATION_ERROR";
411 return "COOKIE_ECHO";
418 case SHUTDOWN_COMPLETE:
419 return "SHUTDOWN_COMPLETE";
425 sctp_optparam_type_to_string (u8 type)
429 case SCTP_IPV4_ADDRESS_TYPE:
430 return "SCTP_IPV4_ADDRESS_TYPE";
431 case SCTP_IPV6_ADDRESS_TYPE:
432 return "SCTP_IPV6_ADDRESS_TYPE";
433 case SCTP_STATE_COOKIE_TYPE:
434 return "SCTP_STATE_COOKIE_TYPE";
435 case SCTP_UNRECOGNIZED_TYPE:
436 return "SCTP_UNRECOGNIZED_TYPE";
437 case SCTP_COOKIE_PRESERVATIVE_TYPE:
438 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
439 case SCTP_HOSTNAME_ADDRESS_TYPE:
440 return "SCTP_HOSTNAME_ADDRESS_TYPE";
441 case SCTP_SUPPORTED_ADDRESS_TYPES:
442 return "SCTP_SUPPORTED_ADDRESS_TYPES";
447 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
448 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
449 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
451 /* As per RFC4960, page 83 */
452 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
453 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
454 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
455 #define SCTP_RTO_BURST 4
456 #define SCTP_RTO_ALPHA 1/8
457 #define SCTP_RTO_BETA 1/4
458 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
459 #define SCTP_ASSOCIATION_MAX_RETRANS 10 // the overall connection
460 #define SCTP_PATH_MAX_RETRANS 5 // number of attempts per destination address
461 #define SCTP_MAX_INIT_RETRANS 8 // number of attempts
462 #define SCTP_HB_INTERVAL 30 * SHZ
463 #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 */
467 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
469 typedef struct _sctp_lookup_dispatch
472 } sctp_lookup_dispatch_t;
474 typedef struct _sctp_main
476 /* Per-worker thread SCTP connection pools */
477 sctp_connection_t **connections;
479 /* Pool of listeners. */
480 sctp_connection_t *listener_pool;
482 /** Dispatch table by state and flags */
483 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
485 u8 log2_tstamp_clocks_per_tick;
486 f64 tstamp_ticks_per_clock;
489 /** per-worker tx buffer free lists */
491 /** per-worker tx frames to SCTP 4/6 output nodes */
492 vlib_frame_t **tx_frames[2];
493 /** per-worker tx frames to ip 4/6 lookup nodes */
494 vlib_frame_t **ip_lookup_tx_frames[2];
496 /* Per worker-thread timer wheel for connections timers */
497 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
499 /* Pool of half-open connections on which we've sent a SYN */
500 sctp_connection_t *half_open_connections;
501 clib_spinlock_t half_open_lock;
503 /* TODO: Congestion control algorithms registered */
504 /* sctp_cc_algorithm_t *cc_algos; */
506 /* Flag that indicates if stack is on or off */
509 /** Number of preallocated connections */
510 u32 preallocated_connections;
512 /** Transport table (preallocation) size parameters */
513 u32 local_endpoints_table_memory;
514 u32 local_endpoints_table_buckets;
516 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
517 ip4_address_t *ip4_src_addresses;
518 u32 last_v4_address_rotor;
519 u32 last_v6_address_rotor;
520 ip6_address_t *ip6_src_addresses;
522 /** vlib buffer size */
523 u32 bytes_per_buffer;
530 extern sctp_main_t sctp_main;
531 extern vlib_node_registration_t sctp4_input_node;
532 extern vlib_node_registration_t sctp6_input_node;
533 extern vlib_node_registration_t sctp4_output_node;
534 extern vlib_node_registration_t sctp6_output_node;
536 always_inline sctp_main_t *
537 vnet_get_sctp_main ()
542 always_inline sctp_header_t *
543 sctp_buffer_hdr (vlib_buffer_t * b)
545 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
546 return (sctp_header_t *) (b->data + b->current_data
547 + vnet_buffer (b)->sctp.hdr_offset);
550 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
552 always_inline sctp_connection_t *
553 sctp_half_open_connection_get (u32 conn_index)
555 sctp_connection_t *tc = 0;
556 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
557 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
558 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
559 tc->sub_conn[SCTP_PRIMARY_PATH_IDX].subconn_idx = SCTP_PRIMARY_PATH_IDX;
560 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
565 * Cleanup half-open connection
569 sctp_half_open_connection_del (sctp_connection_t * tc)
571 sctp_main_t *sctp_main = vnet_get_sctp_main ();
572 clib_spinlock_lock_if_init (&sctp_main->half_open_lock);
573 pool_put_index (sctp_main->half_open_connections,
574 tc->sub_conn[SCTP_PRIMARY_PATH_IDX].c_c_index);
576 memset (tc, 0xFA, sizeof (*tc));
577 clib_spinlock_unlock_if_init (&sctp_main->half_open_lock);
581 sctp_set_time_now (u32 thread_index)
583 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
584 * sctp_main.tstamp_ticks_per_clock;
585 return sctp_main.time_now[thread_index];
589 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
592 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
593 vlib_get_thread_index ());
594 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
595 SCTP_TIMER_HANDLE_INVALID);
597 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
598 sub->timers[timer_id] =
599 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
600 sub->c_c_index, timer_id, interval);
604 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
606 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
607 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
610 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
612 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
613 sub->timers[timer_id]);
614 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
618 * Try to cleanup half-open connection
620 * If called from a thread that doesn't own tc, the call won't have any
623 * @param tc - connection to be cleaned up
624 * @return non-zero if cleanup failed.
627 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
629 /* Make sure this is the owning thread */
630 if (tc->sub_conn[SCTP_PRIMARY_PATH_IDX].c_thread_index !=
631 vlib_get_thread_index ())
633 sctp_timer_reset (tc, SCTP_PRIMARY_PATH_IDX, SCTP_TIMER_T1_INIT);
634 sctp_half_open_connection_del (tc);
641 return sizeof (sctp_header_t);
644 always_inline sctp_connection_t *
645 sctp_get_connection_from_transport (transport_connection_t * tconn)
647 ASSERT (tconn != NULL);
649 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
652 SCTP_ADV_DBG ("sub == NULL");
653 if (sub->parent == NULL)
654 SCTP_ADV_DBG ("sub->parent == NULL");
656 if (sub->subconn_idx > 0)
657 return (sctp_connection_t *) sub -
658 (sizeof (sctp_sub_connection_t) * (sub->subconn_idx - 1));
660 return (sctp_connection_t *) sub;
666 return sctp_main.time_now[vlib_get_thread_index ()];
669 #define ABS(x) ((x) > 0) ? (x) : -(x);
672 sctp_calculate_rto (sctp_connection_t * sctp_conn, u8 conn_idx)
674 /* See RFC4960, 6.3.1. RTO Calculation */
677 u32 now = sctp_time_now ();
678 u32 prev_ts = sctp_conn->sub_conn[conn_idx].rtt_ts;
679 u32 R = prev_ts - now;
681 if (sctp_conn->sub_conn[conn_idx].RTO == 0) // C1: Let's initialize our RTO
683 sctp_conn->sub_conn[conn_idx].RTO = SCTP_RTO_MIN;
687 if (sctp_conn->sub_conn[conn_idx].RTO == SCTP_RTO_MIN && sctp_conn->sub_conn[conn_idx].SRTT == 0) // C2: First RTT calculation
689 sctp_conn->sub_conn[conn_idx].SRTT = R;
693 RTTVAR = 100e-3; /* 100 ms */
695 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
697 else // C3: RTT already exists; let's recalculate
699 RTTVAR = (1 - SCTP_RTO_BETA) * sctp_conn->sub_conn[conn_idx].RTTVAR +
700 SCTP_RTO_BETA * ABS (sctp_conn->sub_conn[conn_idx].SRTT - R);
703 RTTVAR = 100e-3; /* 100 ms */
705 sctp_conn->sub_conn[conn_idx].RTTVAR = RTTVAR;
707 sctp_conn->sub_conn[conn_idx].SRTT =
708 (1 - SCTP_RTO_ALPHA) * sctp_conn->sub_conn[conn_idx].SRTT +
713 sctp_conn->sub_conn[conn_idx].SRTT +
714 4 * sctp_conn->sub_conn[conn_idx].RTTVAR;
715 if (RTO < SCTP_RTO_MIN) // C6
718 if (RTO > SCTP_RTO_MAX) // C7
721 sctp_conn->sub_conn[conn_idx].RTO = RTO;
725 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
728 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
729 vlib_get_thread_index ());
730 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
732 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
733 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
734 sub->timers[timer_id]);
736 tc->sub_conn[conn_idx].timers[timer_id] =
737 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
738 sub->c_c_index, timer_id, interval);
741 always_inline sctp_connection_t *
742 sctp_listener_get (u32 tli)
744 return pool_elt_at_index (sctp_main.listener_pool, tli);
749 always_inline sctp_connection_t *
750 sctp_connection_get (u32 conn_index, u32 thread_index)
753 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
755 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
758 #define SELECT_MAX_RETRIES 8
761 sctp_data_subconn_select (sctp_connection_t * sctp_conn)
763 u32 sub = SCTP_PRIMARY_PATH_IDX;
764 u8 i, cwnd = sctp_conn->sub_conn[SCTP_PRIMARY_PATH_IDX].cwnd;
765 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
767 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
770 if (sctp_conn->sub_conn[i].cwnd > cwnd)
773 cwnd = sctp_conn->sub_conn[i].cwnd;
780 sctp_sub_conn_id_via_ip6h (sctp_connection_t * sctp_conn, ip6_header_t * ip6h)
784 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
786 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[0] ==
787 ip6h->dst_address.as_u64[0] &&
788 sctp_conn->sub_conn[i].connection.lcl_ip.ip6.as_u64[1] ==
789 ip6h->dst_address.as_u64[1] &&
790 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[0] ==
791 ip6h->src_address.as_u64[0] &&
792 sctp_conn->sub_conn[i].connection.rmt_ip.ip6.as_u64[1] ==
793 ip6h->src_address.as_u64[1])
796 clib_warning ("Did not find a sub-connection; defaulting to %u",
797 SCTP_PRIMARY_PATH_IDX);
798 return SCTP_PRIMARY_PATH_IDX;
802 sctp_sub_conn_id_via_ip4h (sctp_connection_t * sctp_conn, ip4_header_t * ip4h)
806 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
808 if (sctp_conn->sub_conn[i].connection.lcl_ip.ip4.as_u32 ==
809 ip4h->dst_address.as_u32
810 && sctp_conn->sub_conn[i].connection.rmt_ip.ip4.as_u32 ==
811 ip4h->src_address.as_u32)
814 clib_warning ("Did not find a sub-connection; defaulting to %u",
815 SCTP_PRIMARY_PATH_IDX);
816 return SCTP_PRIMARY_PATH_IDX;
820 * Push SCTP header to buffer
822 * @param vm - vlib_main
823 * @param b - buffer to write the header to
824 * @param sp_net - source port net order
825 * @param dp_net - destination port net order
826 * @param sctp_hdr_opts_len - header and options length in bytes
828 * @return - pointer to start of SCTP header
831 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
832 u8 sctp_hdr_opts_len)
834 sctp_full_hdr_t *full_hdr;
836 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
838 full_hdr->hdr.src_port = sp;
839 full_hdr->hdr.dst_port = dp;
840 full_hdr->hdr.checksum = 0;
845 * Push SCTP header to buffer
847 * @param b - buffer to write the header to
848 * @param sp_net - source port net order
849 * @param dp_net - destination port net order
850 * @param sctp_hdr_opts_len - header and options length in bytes
852 * @return - pointer to start of SCTP header
855 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
856 u8 sctp_hdr_opts_len)
858 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
863 sctp_next_avail_subconn (sctp_connection_t * sctp_conn)
867 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
869 if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
872 return MAX_SCTP_CONNECTIONS;
876 update_smallest_pmtu_idx (sctp_connection_t * sctp_conn)
879 u8 smallest_pmtu_index = SCTP_PRIMARY_PATH_IDX;
881 for (i = 1; i < MAX_SCTP_CONNECTIONS; i++)
883 if (sctp_conn->sub_conn[i].state != SCTP_SUBCONN_STATE_DOWN)
885 if (sctp_conn->sub_conn[i].PMTU <
886 sctp_conn->sub_conn[smallest_pmtu_index].PMTU)
887 smallest_pmtu_index = i;
891 sctp_conn->smallest_PMTU_idx = smallest_pmtu_index;
894 /* As per RFC4960; section 7.2.1: Slow-Start */
896 sctp_init_cwnd (sctp_connection_t * sctp_conn)
899 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
901 /* Section 7.2.1; point (1) */
902 sctp_conn->sub_conn[i].cwnd =
903 clib_min (4 * sctp_conn->sub_conn[i].PMTU,
904 clib_max (2 * sctp_conn->sub_conn[i].PMTU, 4380));
906 /* Section 7.2.1; point (3) */
907 sctp_conn->sub_conn[i].ssthresh = SCTP_INITIAL_SSHTRESH;
909 /* Section 7.2.2; point (1) */
910 sctp_conn->sub_conn[i].partially_acked_bytes = 0;
915 sctp_in_cong_recovery (sctp_connection_t * sctp_conn, u8 idx)
921 cwnd_fully_utilized (sctp_connection_t * sctp_conn, u8 idx)
926 /* As per RFC4960; section 7.2.1: Slow-Start */
928 update_cwnd (sctp_connection_t * sctp_conn)
932 for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
934 /* Section 7.2.1; point (2) */
935 if (sctp_conn->sub_conn[i].is_retransmitting)
937 sctp_conn->sub_conn[i].cwnd = 1 * sctp_conn->sub_conn[i].PMTU;
941 /* Section 7.2.2; point (4) */
942 if (sctp_conn->sub_conn[i].last_data_ts >
943 sctp_time_now () + SCTP_DATA_IDLE_INTERVAL)
945 sctp_conn->sub_conn[i].cwnd =
946 clib_max (sctp_conn->sub_conn[i].cwnd / 2,
947 4 * sctp_conn->sub_conn[i].PMTU);
951 /* Section 7.2.1; point (5) */
952 if (sctp_conn->sub_conn[i].cwnd <= sctp_conn->sub_conn[i].ssthresh)
954 if (!cwnd_fully_utilized (sctp_conn, i))
957 if (sctp_in_cong_recovery (sctp_conn, i))
960 sctp_conn->sub_conn[i].cwnd =
961 clib_min (sctp_conn->sub_conn[i].PMTU, 1);
967 * fd.io coding-style-patch-verification: ON
970 * eval: (c-set-style "gnu")