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)
44 typedef enum _sctp_error
46 #define sctp_error(n,s) SCTP_ERROR_##n,
47 #include <vnet/sctp/sctp_error.def>
54 #define IS_T_BIT_SET(var) ((var) & (1))
55 #define IS_E_BIT_SET(var) ((var) & (1))
56 #define IS_B_BIT_SET(var) ((var) & (1<<1))
57 #define IS_U_BIT_SET(var) ((var) & (1<<2))
59 #define MAX_SCTP_CONNECTIONS 32
60 #define MAIN_SCTP_SUB_CONN_IDX 0
62 #if (VLIB_BUFFER_TRACE_TRAJECTORY)
63 #define sctp_trajectory_add_start(b, start) \
65 (*vlib_buffer_trace_trajectory_cb) (b, start); \
68 #define sctp_trajectory_add_start(b, start)
71 typedef struct _sctp_sub_connection
73 transport_connection_t connection; /**< Common transport data. First! */
74 void *parent; /**< Link to the parent-super connection */
76 u32 error_count; /**< The current error count for this destination. */
77 u32 error_threshold; /**< Current error threshold for this destination,
78 i.e. what value marks the destination down if error count reaches this value. */
79 u32 cwnd; /**< The current congestion window. */
80 u32 ssthresh; /**< The current ssthresh value. */
82 u32 RTO; /**< The current retransmission timeout value. */
83 u32 SRTT; /**< The current smoothed round-trip time. */
84 u32 RTTVAR; /**< The current RTT variation. */
86 u32 partially_acked_bytes; /**< The tracking method for increase of cwnd when in
87 congestion avoidance mode (see Section 7.2.2).*/
89 u8 state; /**< The current state of this destination, i.e., DOWN, UP, ALLOW-HB, NO-HEARTBEAT, etc. */
91 u16 PMTU; /**< The current known path MTU. */
93 u32 timers[SCTP_N_TIMERS]; /**< A timer used by each destination. */
95 u8 RTO_pending; /**< A flag used to track if one of the DATA chunks sent to
96 this address is currently being used to compute an RTT.
97 If this flag is 0, the next DATA chunk sent to this destination
98 should be used to compute an RTT and this flag should be set.
99 Every time the RTT calculation completes (i.e., the DATA chunk is SACK'd),
102 u32 last_time; /**< The time to which this destination was last sent a packet to.
103 This can be used to determine if a HEARTBEAT is needed. */
105 } sctp_sub_connection_t;
109 u32 a_rwnd; /**< Maximum segment size advertised */
113 /* Useful macros to deal with the out_of_order_map (array of bit) */
114 #define SET_BIT(A,k) ( A[(k/32)] |= (1 << (k%32)) )
115 #define CLEAR_BIT(A,k) ( A[(k/32)] &= ~(1 << (k%32)) )
116 #define TEST_BIT(A,k) ( A[(k/32)] & (1 << (k%32)) )
119 _bytes_swap (void *pv, size_t n)
123 for (lo = 0, hi = n - 1; hi > lo; lo++, hi--)
131 #define ENDIANESS_SWAP(x) _bytes_swap(&x, sizeof(x));
133 #define MAX_INFLIGHT_PACKETS 128
134 #define MAX_ENQUEABLE_SACKS 2
136 /* This parameter indicates to the receiver how much increment in
137 * milliseconds the sender wishes the receiver to add to its default
140 #define SUGGESTED_COOKIE_LIFE_SPAN_INCREMENT 1000
142 typedef struct _sctp_connection
144 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
146 u8 state; /**< SCTP state as per sctp_state_t */
147 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
149 u32 local_tag; /**< INIT_TAG generated locally */
150 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
152 u32 local_initial_tsn; /**< Initial TSN generated locally */
153 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
155 u32 peer_cookie_life_span_increment;
157 u32 overall_err_count; /**< The overall association error count. */
158 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
159 reaches will cause this association to be torn down. */
161 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
163 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
164 This is sent in the INIT or INIT ACK chunk to the peer
165 and incremented each time a DATA chunk is assigned a
166 TSN (normally just prior to transmit or during
169 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
171 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
172 is set initially by taking the peer's initial TSN,
173 received in the INIT or INIT ACK chunk, and
174 subtracting one from it. */
176 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
177 TSNs have been received (relative to the Last Rcvd TSN).
178 If no gaps exist, i.e., no out-of-order packets have been received,
179 this array will be set to all zero. */
181 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
182 This is initialized to 0. When a packet is received it is incremented.
183 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
184 Note: This is used only when no DATA chunks are received out-of-order.
185 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
187 u32 a_rwnd; /** This value represents the dedicated buffer space, in number of bytes,
188 the sender of the INIT has reserved in association with this window.
189 During the life of the association, this buffer space SHOULD NOT be lessened
190 (i.e., dedicated buffers taken away from this association);
191 however, an endpoint MAY change the value of a_rwnd it sends in SACK chunks. */
193 u32 smallest_PMTU; /** The smallest PMTU discovered for all of the peer's transport addresses. */
195 u32 rcv_a_rwnd; /**< LOCAL max seg size that includes options. To be updated by congestion algos, etc. */
196 u32 snd_a_rwnd; /**< REMOTE max seg size that includes options. To be updated if peer pushes back on window, etc.*/
201 u8 overall_sending_status; /**< 0 indicates first fragment of a user message
202 1 indicates normal stream
203 2 indicates last fragment of a user message */
205 sctp_options_t rcv_opts;
206 sctp_options_t snd_opts;
208 u32 snd_hdr_length; /**< BASE HEADER LENGTH for the DATA chunk when sending */
209 u8 next_avail_sub_conn; /**< Represent the index of the next free slot in sub_conn */
213 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
215 sctp_connection_t *sctp_connection_new (u8 thread_index);
216 void sctp_sub_connection_add_ip4 (u8 thread_index,
217 sctp_ipv4_addr_param_t * ipv4_addr);
218 void sctp_sub_connection_add_ip6 (u8 thread_index,
219 sctp_ipv6_addr_param_t * ipv6_addr);
220 void sctp_connection_close (sctp_connection_t * tc);
221 void sctp_connection_cleanup (sctp_connection_t * tc);
222 void sctp_connection_del (sctp_connection_t * tc);
224 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
225 void sctp_send_init (sctp_connection_t * tc);
226 void sctp_send_shutdown (sctp_connection_t * tc);
227 void sctp_send_shutdown_ack (sctp_connection_t * tc);
228 void sctp_send_shutdown_complete (sctp_connection_t * tc);
229 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
231 void sctp_flush_frames_to_output (u8 thread_index);
232 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
234 format_function_t format_sctp_state;
236 u8 *format_sctp_connection_id (u8 * s, va_list * args);
237 u8 *format_sctp_connection (u8 * s, va_list * args);
238 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
239 u8 *format_sctp_header (u8 * s, va_list * args);
240 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
242 clib_error_t *sctp_init (vlib_main_t * vm);
243 void sctp_connection_timers_init (sctp_connection_t * tc);
244 void sctp_connection_timers_reset (sctp_connection_t * tc);
245 void sctp_init_snd_vars (sctp_connection_t * tc);
246 void sctp_init_mss (sctp_connection_t * tc);
248 void sctp_prepare_initack_chunk (sctp_connection_t * ts, vlib_buffer_t * b,
249 ip4_address_t * ip4_addr,
250 ip6_address_t * ip6_addr);
251 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * tc,
253 sctp_state_cookie_param_t * sc);
254 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * tc,
256 void sctp_prepare_sack_chunk (sctp_connection_t * tc, vlib_buffer_t * b);
258 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * tc);
260 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
261 #define STHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
262 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
263 #define SCTP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
264 #define SCTP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
265 #define SCTP_MAX_OPTION_SPACE 40
267 #define SCTP_DUPACK_THRESHOLD 3
268 #define SCTP_MAX_RX_FIFO_SIZE 4 << 20
269 #define SCTP_MIN_RX_FIFO_SIZE 4 << 10
270 #define SCTP_IW_N_SEGMENTS 10
271 #define SCTP_ALWAYS_ACK 1 /**< On/off delayed acks */
272 #define SCTP_USE_SACKS 1 /**< Disable only for testing */
274 #define IP_PROTOCOL_SCTP 132
276 /** SSCTP FSM state definitions as per RFC4960. */
277 #define foreach_sctp_fsm_state \
278 _(CLOSED, "CLOSED") \
279 _(COOKIE_WAIT, "COOKIE_WAIT") \
280 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
281 _(ESTABLISHED, "ESTABLISHED") \
282 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
283 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
284 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
285 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
287 typedef enum _sctp_state
289 #define _(sym, str) SCTP_STATE_##sym,
290 foreach_sctp_fsm_state
296 sctp_state_to_string (u8 state)
300 case SCTP_STATE_CLOSED:
301 return "SCTP_STATE_CLOSED";
302 case SCTP_STATE_COOKIE_WAIT:
303 return "SCTP_STATE_COOKIE_WAIT";
304 case SCTP_STATE_COOKIE_ECHOED:
305 return "SCTP_STATE_COOKIE_ECHOED";
306 case SCTP_STATE_ESTABLISHED:
307 return "SCTP_STATE_ESTABLISHED";
308 case SCTP_STATE_SHUTDOWN_PENDING:
309 return "SCTP_STATE_SHUTDOWN_PENDING";
310 case SCTP_STATE_SHUTDOWN_SENT:
311 return "SCTP_STATE_SHUTDOWN_SENT";
312 case SCTP_STATE_SHUTDOWN_RECEIVED:
313 return "SCTP_STATE_SHUTDOWN_RECEIVED";
314 case SCTP_STATE_SHUTDOWN_ACK_SENT:
315 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
321 sctp_chunk_to_string (u8 type)
336 return "HEARTBEAT_ACK";
342 return "SHUTDOWN_ACK";
343 case OPERATION_ERROR:
344 return "OPERATION_ERROR";
346 return "COOKIE_ECHO";
353 case SHUTDOWN_COMPLETE:
354 return "SHUTDOWN_COMPLETE";
360 sctp_optparam_type_to_string (u8 type)
364 case SCTP_IPV4_ADDRESS_TYPE:
365 return "SCTP_IPV4_ADDRESS_TYPE";
366 case SCTP_IPV6_ADDRESS_TYPE:
367 return "SCTP_IPV6_ADDRESS_TYPE";
368 case SCTP_STATE_COOKIE_TYPE:
369 return "SCTP_STATE_COOKIE_TYPE";
370 case SCTP_UNRECOGNIZED_TYPE:
371 return "SCTP_UNRECOGNIZED_TYPE";
372 case SCTP_COOKIE_PRESERVATIVE_TYPE:
373 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
374 case SCTP_HOSTNAME_ADDRESS_TYPE:
375 return "SCTP_HOSTNAME_ADDRESS_TYPE";
376 case SCTP_SUPPORTED_ADDRESS_TYPES:
377 return "SCTP_SUPPORTED_ADDRESS_TYPES";
382 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
383 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
385 /* As per RFC4960, page 83 */
386 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
387 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
388 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
389 #define SCTP_RTO_BURST 4
390 #define SCTP_RTO_ALPHA 1/8
391 #define SCTP_RTO_BETA 1/4
392 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
393 #define SCTP_ASSOCIATION_MAX_RETRANS 10
395 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
397 typedef struct _sctp_lookup_dispatch
400 } sctp_lookup_dispatch_t;
402 typedef struct _sctp_main
404 /* Per-worker thread SCTP connection pools */
405 sctp_connection_t **connections;
407 /* Pool of listeners. */
408 sctp_connection_t *listener_pool;
410 /** Dispatch table by state and flags */
411 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
413 u8 log2_tstamp_clocks_per_tick;
414 f64 tstamp_ticks_per_clock;
417 /** per-worker tx buffer free lists */
419 /** per-worker tx frames to SCTP 4/6 output nodes */
420 vlib_frame_t **tx_frames[2];
421 /** per-worker tx frames to ip 4/6 lookup nodes */
422 vlib_frame_t **ip_lookup_tx_frames[2];
424 /* Per worker-thread timer wheel for connections timers */
425 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
427 /* Pool of half-open connections on which we've sent a SYN */
428 sctp_connection_t *half_open_connections;
429 clib_spinlock_t half_open_lock;
431 /* TODO: Congestion control algorithms registered */
432 /* sctp_cc_algorithm_t *cc_algos; */
434 /* Flag that indicates if stack is on or off */
437 /** Number of preallocated connections */
438 u32 preallocated_connections;
440 /** Transport table (preallocation) size parameters */
441 u32 local_endpoints_table_memory;
442 u32 local_endpoints_table_buckets;
444 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
445 ip4_address_t *ip4_src_addresses;
446 u32 last_v4_address_rotor;
447 u32 last_v6_address_rotor;
448 ip6_address_t *ip6_src_addresses;
450 /** vlib buffer size */
451 u32 bytes_per_buffer;
458 extern sctp_main_t sctp_main;
459 extern vlib_node_registration_t sctp4_input_node;
460 extern vlib_node_registration_t sctp6_input_node;
461 extern vlib_node_registration_t sctp4_output_node;
462 extern vlib_node_registration_t sctp6_output_node;
464 always_inline sctp_main_t *
465 vnet_get_sctp_main ()
470 always_inline sctp_header_t *
471 sctp_buffer_hdr (vlib_buffer_t * b)
473 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
474 return (sctp_header_t *) (b->data + b->current_data
475 + vnet_buffer (b)->sctp.hdr_offset);
478 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
480 always_inline sctp_connection_t *
481 sctp_half_open_connection_get (u32 conn_index)
483 sctp_connection_t *tc = 0;
484 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
485 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
486 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
487 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = tc;
488 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
493 * Cleanup half-open connection
497 sctp_half_open_connection_del (sctp_connection_t * tc)
499 sctp_main_t *tm = vnet_get_sctp_main ();
500 clib_spinlock_lock_if_init (&tm->half_open_lock);
501 pool_put_index (tm->half_open_connections,
502 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_c_index);
504 memset (tc, 0xFA, sizeof (*tc));
505 clib_spinlock_unlock_if_init (&tm->half_open_lock);
509 sctp_set_time_now (u32 thread_index)
511 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
512 * sctp_main.tstamp_ticks_per_clock;
513 return sctp_main.time_now[thread_index];
517 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
520 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
521 vlib_get_thread_index ());
522 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
523 SCTP_TIMER_HANDLE_INVALID);
525 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
526 tc->sub_conn[conn_idx].timers[timer_id] =
527 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
528 sub->c_c_index, timer_id, interval);
532 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
534 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
535 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
538 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
540 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
541 sub->timers[timer_id]);
542 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
546 sctp_update_time (f64 now, u32 thread_index)
548 sctp_set_time_now (thread_index);
549 tw_timer_expire_timers_16t_2w_512sl (&sctp_main.timer_wheels[thread_index],
551 sctp_flush_frames_to_output (thread_index);
555 * Try to cleanup half-open connection
557 * If called from a thread that doesn't own tc, the call won't have any
560 * @param tc - connection to be cleaned up
561 * @return non-zero if cleanup failed.
564 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
566 /* Make sure this is the owning thread */
567 if (tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_thread_index !=
568 vlib_get_thread_index ())
570 sctp_timer_reset (tc, MAIN_SCTP_SUB_CONN_IDX, SCTP_TIMER_T1_INIT);
571 sctp_half_open_connection_del (tc);
578 return sizeof (sctp_header_t);
581 always_inline sctp_connection_t *
582 sctp_get_connection_from_transport (transport_connection_t * tconn)
584 ASSERT (tconn != NULL);
586 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
589 SCTP_ADV_DBG ("sub == NULL");
590 if (sub->parent == NULL)
591 SCTP_ADV_DBG ("sub->parent == NULL");
593 return (sctp_connection_t *) sub->parent;
599 return sctp_main.time_now[vlib_get_thread_index ()];
603 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
606 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
607 vlib_get_thread_index ());
608 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
610 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
611 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
612 sub->timers[timer_id]);
614 tc->sub_conn[conn_idx].timers[timer_id] =
615 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
616 sub->c_c_index, timer_id, interval);
619 always_inline sctp_connection_t *
620 sctp_listener_get (u32 tli)
622 return pool_elt_at_index (sctp_main.listener_pool, tli);
627 always_inline sctp_connection_t *
628 sctp_connection_get (u32 conn_index, u32 thread_index)
631 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
633 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
637 sctp_pick_conn_idx_on_chunk (sctp_chunk_type chunk_type)
639 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
652 case OPERATION_ERROR:
657 case SHUTDOWN_COMPLETE:
658 idx = MAIN_SCTP_SUB_CONN_IDX;
664 sctp_pick_conn_idx_on_state (sctp_state_t state)
666 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
670 case SCTP_STATE_CLOSED:
671 case SCTP_STATE_COOKIE_WAIT:
672 case SCTP_STATE_COOKIE_ECHOED:
673 case SCTP_STATE_ESTABLISHED:
674 case SCTP_STATE_SHUTDOWN_PENDING:
675 case SCTP_STATE_SHUTDOWN_SENT:
676 case SCTP_STATE_SHUTDOWN_RECEIVED:
677 case SCTP_STATE_SHUTDOWN_ACK_SENT:
678 idx = MAIN_SCTP_SUB_CONN_IDX;
680 idx = MAIN_SCTP_SUB_CONN_IDX;
686 * Push SCTP header to buffer
688 * @param vm - vlib_main
689 * @param b - buffer to write the header to
690 * @param sp_net - source port net order
691 * @param dp_net - destination port net order
692 * @param sctp_hdr_opts_len - header and options length in bytes
694 * @return - pointer to start of SCTP header
697 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
698 u8 sctp_hdr_opts_len)
700 sctp_full_hdr_t *full_hdr;
702 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
704 full_hdr->hdr.src_port = sp;
705 full_hdr->hdr.dst_port = dp;
706 full_hdr->hdr.checksum = 0;
711 * Push SCTP header to buffer
713 * @param b - buffer to write the header to
714 * @param sp_net - source port net order
715 * @param dp_net - destination port net order
716 * @param sctp_hdr_opts_len - header and options length in bytes
718 * @return - pointer to start of SCTP header
721 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
722 u8 sctp_hdr_opts_len)
724 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
729 * fd.io coding-style-patch-verification: ON
732 * eval: (c-set-style "gnu")