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 #define SetBit(A,k) ( A[(k/32)] |= (1 << (k%32)) )
114 #define ClearBit(A,k) ( A[(k/32)] &= ~(1 << (k%32)) )
115 #define TestBit(A,k) ( A[(k/32)] & (1 << (k%32)) )
117 #define MAX_INFLIGHT_PACKETS 128
118 #define MAX_ENQUEABLE_SACKS 2
120 /* This parameter indicates to the receiver how much increment in
121 * milliseconds the sender wishes the receiver to add to its default
124 #define SUGGESTED_COOKIE_LIFE_SPAN_INCREMENT 1000
126 typedef struct _sctp_connection
128 sctp_sub_connection_t sub_conn[MAX_SCTP_CONNECTIONS]; /**< Common transport data. First! */
130 u8 state; /**< SCTP state as per sctp_state_t */
131 u16 flags; /**< Chunk flag (see sctp_chunks_common_hdr_t) */
133 u32 local_tag; /**< INIT_TAG generated locally */
134 u32 remote_tag; /**< INIT_TAG generated by the remote peer */
136 u32 local_initial_tsn; /**< Initial TSN generated locally */
137 u32 remote_initial_tsn; /**< Initial TSN generated by the remote-peer */
139 u32 peer_cookie_life_span_increment;
141 u32 overall_err_count; /**< The overall association error count. */
142 u32 overall_err_treshold; /**< The threshold for this association that if the Overall Error Count
143 reaches will cause this association to be torn down. */
145 u32 peer_rwnd; /**< Current calculated value of the peer's rwnd. */
147 u32 next_tsn; /**< The next TSN number to be assigned to a new DATA chunk.
148 This is sent in the INIT or INIT ACK chunk to the peer
149 and incremented each time a DATA chunk is assigned a
150 TSN (normally just prior to transmit or during
153 u32 next_tsn_expected; /**< The next TSN number expected to be received. */
155 u32 last_rcvd_tsn; /**< This is the last TSN received in sequence. This value
156 is set initially by taking the peer's initial TSN,
157 received in the INIT or INIT ACK chunk, and
158 subtracting one from it. */
160 u32 out_of_order_map[MAX_INFLIGHT_PACKETS]; /**< An array of bits or bytes indicating which out-of-order
161 TSNs have been received (relative to the Last Rcvd TSN).
162 If no gaps exist, i.e., no out-of-order packets have been received,
163 this array will be set to all zero. */
165 u8 ack_state; /**< This flag indicates if the next received packet is set to be responded to with a SACK.
166 This is initialized to 0. When a packet is received it is incremented.
167 If this value reaches 2 or more, a SACK is sent and the value is reset to 0.
168 Note: This is used only when no DATA chunks are received out-of-order.
169 When DATA chunks are out-of-order, SACKs are not delayed (see Section 6). */
171 u32 a_rwnd; /** This value represents the dedicated buffer space, in number of bytes,
172 the sender of the INIT has reserved in association with this window.
173 During the life of the association, this buffer space SHOULD NOT be lessened
174 (i.e., dedicated buffers taken away from this association);
175 however, an endpoint MAY change the value of a_rwnd it sends in SACK chunks. */
177 u32 smallest_PMTU; /** The smallest PMTU discovered for all of the peer's transport addresses. */
179 u32 rcv_a_rwnd; /**< LOCAL max seg size that includes options. To be updated by congestion algos, etc. */
180 u32 snd_a_rwnd; /**< REMOTE max seg size that includes options. To be updated if peer pushes back on window, etc.*/
185 sctp_options_t rcv_opts;
186 sctp_options_t snd_opts;
188 u32 snd_hdr_length; /**< BASE HEADER LENGTH for the DATA chunk when sending */
189 u8 next_avail_sub_conn; /**< Represent the index of the next free slot in sub_conn */
193 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
195 sctp_connection_t *sctp_connection_new (u8 thread_index);
196 void sctp_sub_connection_add_ip4 (u8 thread_index,
197 sctp_ipv4_addr_param_t * ipv4_addr);
198 void sctp_sub_connection_add_ip6 (u8 thread_index,
199 sctp_ipv6_addr_param_t * ipv6_addr);
200 void sctp_connection_close (sctp_connection_t * tc);
201 void sctp_connection_cleanup (sctp_connection_t * tc);
202 void sctp_connection_del (sctp_connection_t * tc);
204 u32 sctp_push_header (transport_connection_t * tconn, vlib_buffer_t * b);
205 void sctp_send_init (sctp_connection_t * tc);
206 void sctp_send_shutdown (sctp_connection_t * tc);
207 void sctp_send_shutdown_ack (sctp_connection_t * tc);
208 void sctp_send_shutdown_complete (sctp_connection_t * tc);
209 void sctp_flush_frame_to_output (vlib_main_t * vm, u8 thread_index,
211 void sctp_flush_frames_to_output (u8 thread_index);
212 void sctp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
214 format_function_t format_sctp_state;
216 u8 *format_sctp_connection_id (u8 * s, va_list * args);
217 u8 *format_sctp_connection (u8 * s, va_list * args);
218 u8 *format_sctp_scoreboard (u8 * s, va_list * args);
219 u8 *format_sctp_header (u8 * s, va_list * args);
220 u8 *format_sctp_tx_trace (u8 * s, va_list * args);
222 clib_error_t *sctp_init (vlib_main_t * vm);
223 void sctp_connection_timers_init (sctp_connection_t * tc);
224 void sctp_connection_timers_reset (sctp_connection_t * tc);
225 void sctp_init_snd_vars (sctp_connection_t * tc);
226 void sctp_init_mss (sctp_connection_t * tc);
228 void sctp_prepare_initack_chunk (sctp_connection_t * ts, vlib_buffer_t * b,
229 ip4_address_t * ip4_addr,
230 ip6_address_t * ip6_addr);
231 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * tc,
233 sctp_state_cookie_param_t * sc);
234 void sctp_prepare_cookie_ack_chunk (sctp_connection_t * tc,
236 void sctp_prepare_sack_chunk (sctp_connection_t * tc, vlib_buffer_t * b);
238 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * tc);
240 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
241 #define STHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
242 #define SCTP_TSTAMP_RESOLUTION SCTP_TICK /**< Time stamp resolution */
243 #define SCTP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */
244 #define SCTP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */
245 #define SCTP_MAX_OPTION_SPACE 40
247 #define SCTP_DUPACK_THRESHOLD 3
248 #define SCTP_MAX_RX_FIFO_SIZE 4 << 20
249 #define SCTP_MIN_RX_FIFO_SIZE 4 << 10
250 #define SCTP_IW_N_SEGMENTS 10
251 #define SCTP_ALWAYS_ACK 1 /**< On/off delayed acks */
252 #define SCTP_USE_SACKS 1 /**< Disable only for testing */
254 #define IP_PROTOCOL_SCTP 132
256 /** SSCTP FSM state definitions as per RFC4960. */
257 #define foreach_sctp_fsm_state \
258 _(CLOSED, "CLOSED") \
259 _(COOKIE_WAIT, "COOKIE_WAIT") \
260 _(COOKIE_ECHOED, "COOKIE_ECHOED") \
261 _(ESTABLISHED, "ESTABLISHED") \
262 _(SHUTDOWN_PENDING, "SHUTDOWN_PENDING") \
263 _(SHUTDOWN_SENT, "SHUTDOWN_SENT") \
264 _(SHUTDOWN_RECEIVED, "SHUTDOWN_RECEIVED") \
265 _(SHUTDOWN_ACK_SENT, "SHUTDOWN_ACK_SENT")
267 typedef enum _sctp_state
269 #define _(sym, str) SCTP_STATE_##sym,
270 foreach_sctp_fsm_state
276 sctp_state_to_string (u8 state)
280 case SCTP_STATE_CLOSED:
281 return "SCTP_STATE_CLOSED";
282 case SCTP_STATE_COOKIE_WAIT:
283 return "SCTP_STATE_COOKIE_WAIT";
284 case SCTP_STATE_COOKIE_ECHOED:
285 return "SCTP_STATE_COOKIE_ECHOED";
286 case SCTP_STATE_ESTABLISHED:
287 return "SCTP_STATE_ESTABLISHED";
288 case SCTP_STATE_SHUTDOWN_PENDING:
289 return "SCTP_STATE_SHUTDOWN_PENDING";
290 case SCTP_STATE_SHUTDOWN_SENT:
291 return "SCTP_STATE_SHUTDOWN_SENT";
292 case SCTP_STATE_SHUTDOWN_RECEIVED:
293 return "SCTP_STATE_SHUTDOWN_RECEIVED";
294 case SCTP_STATE_SHUTDOWN_ACK_SENT:
295 return "SCTP_STATE_SHUTDOWN_ACK_SENT";
301 sctp_chunk_to_string (u8 type)
316 return "HEARTBEAT_ACK";
322 return "SHUTDOWN_ACK";
323 case OPERATION_ERROR:
324 return "OPERATION_ERROR";
326 return "COOKIE_ECHO";
333 case SHUTDOWN_COMPLETE:
334 return "SHUTDOWN_COMPLETE";
340 sctp_optparam_type_to_string (u8 type)
344 case SCTP_IPV4_ADDRESS_TYPE:
345 return "SCTP_IPV4_ADDRESS_TYPE";
346 case SCTP_IPV6_ADDRESS_TYPE:
347 return "SCTP_IPV6_ADDRESS_TYPE";
348 case SCTP_STATE_COOKIE_TYPE:
349 return "SCTP_STATE_COOKIE_TYPE";
350 case SCTP_UNRECOGNIZED_TYPE:
351 return "SCTP_UNRECOGNIZED_TYPE";
352 case SCTP_COOKIE_PRESERVATIVE_TYPE:
353 return "SCTP_COOKIE_PRESERVATIVE_TYPE";
354 case SCTP_HOSTNAME_ADDRESS_TYPE:
355 return "SCTP_HOSTNAME_ADDRESS_TYPE";
356 case SCTP_SUPPORTED_ADDRESS_TYPES:
357 return "SCTP_SUPPORTED_ADDRESS_TYPES";
362 #define SCTP_TICK 0.001 /**< SCTP tick period (s) */
363 #define SHZ (u32) (1/SCTP_TICK) /**< SCTP tick frequency */
365 /* As per RFC4960, page 83 */
366 #define SCTP_RTO_INIT 3 * SHZ /* 3 seconds */
367 #define SCTP_RTO_MIN 1 * SHZ /* 1 second */
368 #define SCTP_RTO_MAX 60 * SHZ /* 60 seconds */
369 #define SCTP_RTO_BURST 4
370 #define SCTP_RTO_ALPHA 1/8
371 #define SCTP_RTO_BETA 1/4
372 #define SCTP_VALID_COOKIE_LIFE 60 * SHZ /* 60 seconds */
373 #define SCTP_ASSOCIATION_MAX_RETRANS 10
375 #define SCTP_TO_TIMER_TICK SCTP_TICK*10 /* Period for converting from SCTP_TICK */
377 typedef struct _sctp_lookup_dispatch
380 } sctp_lookup_dispatch_t;
382 typedef struct _sctp_main
384 /* Per-worker thread SCTP connection pools */
385 sctp_connection_t **connections;
387 /* Pool of listeners. */
388 sctp_connection_t *listener_pool;
390 /** Dispatch table by state and flags */
391 sctp_lookup_dispatch_t dispatch_table[SCTP_N_STATES][64];
393 u8 log2_tstamp_clocks_per_tick;
394 f64 tstamp_ticks_per_clock;
397 /** per-worker tx buffer free lists */
399 /** per-worker tx frames to SCTP 4/6 output nodes */
400 vlib_frame_t **tx_frames[2];
401 /** per-worker tx frames to ip 4/6 lookup nodes */
402 vlib_frame_t **ip_lookup_tx_frames[2];
404 /* Per worker-thread timer wheel for connections timers */
405 tw_timer_wheel_16t_2w_512sl_t *timer_wheels;
407 /* Pool of half-open connections on which we've sent a SYN */
408 sctp_connection_t *half_open_connections;
409 clib_spinlock_t half_open_lock;
411 /* TODO: Congestion control algorithms registered */
412 /* sctp_cc_algorithm_t *cc_algos; */
414 /* Flag that indicates if stack is on or off */
417 /** Number of preallocated connections */
418 u32 preallocated_connections;
420 /** Transport table (preallocation) size parameters */
421 u32 local_endpoints_table_memory;
422 u32 local_endpoints_table_buckets;
424 /** Vectors of src addresses. Optional unless one needs > 63K active-opens */
425 ip4_address_t *ip4_src_addresses;
426 u32 last_v4_address_rotor;
427 u32 last_v6_address_rotor;
428 ip6_address_t *ip6_src_addresses;
430 /** vlib buffer size */
431 u32 bytes_per_buffer;
438 extern sctp_main_t sctp_main;
439 extern vlib_node_registration_t sctp4_input_node;
440 extern vlib_node_registration_t sctp6_input_node;
441 extern vlib_node_registration_t sctp4_output_node;
442 extern vlib_node_registration_t sctp6_output_node;
444 always_inline sctp_main_t *
445 vnet_get_sctp_main ()
450 always_inline sctp_header_t *
451 sctp_buffer_hdr (vlib_buffer_t * b)
453 ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE);
454 return (sctp_header_t *) (b->data + b->current_data
455 + vnet_buffer (b)->sctp.hdr_offset);
458 clib_error_t *vnet_sctp_enable_disable (vlib_main_t * vm, u8 is_en);
460 always_inline sctp_connection_t *
461 sctp_half_open_connection_get (u32 conn_index)
463 sctp_connection_t *tc = 0;
464 clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
465 if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
466 tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
467 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = tc;
468 clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
473 * Cleanup half-open connection
477 sctp_half_open_connection_del (sctp_connection_t * tc)
479 sctp_main_t *tm = vnet_get_sctp_main ();
480 clib_spinlock_lock_if_init (&tm->half_open_lock);
481 pool_put_index (tm->half_open_connections,
482 tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_c_index);
484 memset (tc, 0xFA, sizeof (*tc));
485 clib_spinlock_unlock_if_init (&tm->half_open_lock);
489 sctp_set_time_now (u32 thread_index)
491 sctp_main.time_now[thread_index] = clib_cpu_time_now ()
492 * sctp_main.tstamp_ticks_per_clock;
493 return sctp_main.time_now[thread_index];
497 sctp_timer_set (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
500 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
501 vlib_get_thread_index ());
502 ASSERT (tc->sub_conn[conn_idx].timers[timer_id] ==
503 SCTP_TIMER_HANDLE_INVALID);
505 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
506 tc->sub_conn[conn_idx].timers[timer_id] =
507 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
508 sub->c_c_index, timer_id, interval);
512 sctp_timer_reset (sctp_connection_t * tc, u8 conn_idx, u8 timer_id)
514 ASSERT (tc->sub_conn[conn_idx].c_thread_index == vlib_get_thread_index ());
515 if (tc->sub_conn[conn_idx].timers[timer_id] == SCTP_TIMER_HANDLE_INVALID)
518 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
520 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
521 sub->timers[timer_id]);
522 sub->timers[timer_id] = SCTP_TIMER_HANDLE_INVALID;
526 sctp_update_time (f64 now, u32 thread_index)
528 sctp_set_time_now (thread_index);
529 tw_timer_expire_timers_16t_2w_512sl (&sctp_main.timer_wheels[thread_index],
531 sctp_flush_frames_to_output (thread_index);
535 * Try to cleanup half-open connection
537 * If called from a thread that doesn't own tc, the call won't have any
540 * @param tc - connection to be cleaned up
541 * @return non-zero if cleanup failed.
544 sctp_half_open_connection_cleanup (sctp_connection_t * tc)
546 /* Make sure this is the owning thread */
547 if (tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].c_thread_index !=
548 vlib_get_thread_index ())
550 sctp_timer_reset (tc, MAIN_SCTP_SUB_CONN_IDX, SCTP_TIMER_T1_INIT);
551 sctp_half_open_connection_del (tc);
558 return sizeof (sctp_header_t);
561 always_inline sctp_connection_t *
562 sctp_get_connection_from_transport (transport_connection_t * tconn)
564 ASSERT (tconn != NULL);
566 sctp_sub_connection_t *sub = (sctp_sub_connection_t *) tconn;
569 SCTP_ADV_DBG ("sub == NULL");
570 if (sub->parent == NULL)
571 SCTP_ADV_DBG ("sub->parent == NULL");
573 return (sctp_connection_t *) sub->parent;
579 return sctp_main.time_now[vlib_get_thread_index ()];
583 sctp_timer_update (sctp_connection_t * tc, u8 conn_idx, u8 timer_id,
586 ASSERT (tc->sub_conn[conn_idx].connection.thread_index ==
587 vlib_get_thread_index ());
588 sctp_sub_connection_t *sub = &tc->sub_conn[conn_idx];
590 if (tc->sub_conn[conn_idx].timers[timer_id] != SCTP_TIMER_HANDLE_INVALID)
591 tw_timer_stop_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
592 sub->timers[timer_id]);
594 tc->sub_conn[conn_idx].timers[timer_id] =
595 tw_timer_start_16t_2w_512sl (&sctp_main.timer_wheels[sub->c_thread_index],
596 sub->c_c_index, timer_id, interval);
599 always_inline sctp_connection_t *
600 sctp_listener_get (u32 tli)
602 return pool_elt_at_index (sctp_main.listener_pool, tli);
607 always_inline sctp_connection_t *
608 sctp_connection_get (u32 conn_index, u32 thread_index)
611 (pool_is_free_index (sctp_main.connections[thread_index], conn_index)))
613 return pool_elt_at_index (sctp_main.connections[thread_index], conn_index);
617 sctp_pick_conn_idx_on_chunk (sctp_chunk_type chunk_type)
619 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
632 case OPERATION_ERROR:
637 case SHUTDOWN_COMPLETE:
638 idx = MAIN_SCTP_SUB_CONN_IDX;
644 sctp_pick_conn_idx_on_state (sctp_state_t state)
646 u8 idx = MAIN_SCTP_SUB_CONN_IDX;
650 case SCTP_STATE_CLOSED:
651 case SCTP_STATE_COOKIE_WAIT:
652 case SCTP_STATE_COOKIE_ECHOED:
653 case SCTP_STATE_ESTABLISHED:
654 case SCTP_STATE_SHUTDOWN_PENDING:
655 case SCTP_STATE_SHUTDOWN_SENT:
656 case SCTP_STATE_SHUTDOWN_RECEIVED:
657 case SCTP_STATE_SHUTDOWN_ACK_SENT:
658 idx = MAIN_SCTP_SUB_CONN_IDX;
660 idx = MAIN_SCTP_SUB_CONN_IDX;
666 * Push SCTP header to buffer
668 * @param vm - vlib_main
669 * @param b - buffer to write the header to
670 * @param sp_net - source port net order
671 * @param dp_net - destination port net order
672 * @param sctp_hdr_opts_len - header and options length in bytes
674 * @return - pointer to start of SCTP header
677 vlib_buffer_push_sctp_net_order (vlib_buffer_t * b, u16 sp, u16 dp,
678 u8 sctp_hdr_opts_len)
680 sctp_full_hdr_t *full_hdr;
682 full_hdr = vlib_buffer_push_uninit (b, sctp_hdr_opts_len);
684 full_hdr->hdr.src_port = sp;
685 full_hdr->hdr.dst_port = dp;
686 full_hdr->hdr.checksum = 0;
691 * Push SCTP header to buffer
693 * @param b - buffer to write the header to
694 * @param sp_net - source port net order
695 * @param dp_net - destination port net order
696 * @param sctp_hdr_opts_len - header and options length in bytes
698 * @return - pointer to start of SCTP header
701 vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
702 u8 sctp_hdr_opts_len)
704 return vlib_buffer_push_sctp_net_order (b, sp_net, dp_net,
709 * fd.io coding-style-patch-verification: ON
712 * eval: (c-set-style "gnu")