2 * Copyright (c) 2017 Cisco and/or its affiliates.
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.
18 * @brief IPv4 Shallow Virtual Reassembly.
20 * This file contains the source code for IPv4 Shallow Virtual reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vnet/ip/ip4_to_ip6.h>
27 #include <vppinfra/fifo.h>
28 #include <vppinfra/bihash_16_8.h>
29 #include <vnet/ip/reass/ip4_sv_reass.h>
31 #define MSEC_PER_SEC 1000
32 #define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100
33 #define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
34 #define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
35 #define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
36 #define IP4_SV_REASS_HT_LOAD_FACTOR (0.75)
41 IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS,
42 IP4_SV_REASS_RC_UNSUPP_IP_PROTO,
79 clib_bihash_kv_16_8_t kv;
85 ip4_sv_reass_key_t key;
86 // time when last packet was received
88 // internal id of this reassembly
90 // trace operation counter
92 // minimum fragment length for this reassembly - used to estimate MTU
93 u16 min_fragment_length;
94 // buffer indexes of buffers in this reassembly in chronological order -
95 // including overlaps and duplicate fragments
97 // set to true when this reassembly is completed
101 u8 icmp_type_or_tcp_flags;
116 ip4_sv_reass_t *pool;
119 clib_spinlock_t lock;
124 } ip4_sv_reass_per_thread_t;
131 u32 expire_walk_interval_ms;
132 // maximum number of fragments in one reassembly
134 // maximum number of reassemblies
138 clib_bihash_16_8_t hash;
140 ip4_sv_reass_per_thread_t *per_thread_data;
143 vlib_main_t *vlib_main;
144 vnet_main_t *vnet_main;
146 // node index of ip4-drop node
148 u32 ip4_sv_reass_expire_node_idx;
150 /** Worker handoff */
152 u32 fq_feature_index;
154 // reference count for enabling/disabling feature - per interface
155 u32 *feature_use_refcount_per_intf;
157 // reference count for enabling/disabling feature - per interface
158 u32 *output_feature_use_refcount_per_intf;
160 } ip4_sv_reass_main_t;
162 extern ip4_sv_reass_main_t ip4_sv_reass_main;
164 #ifndef CLIB_MARCH_VARIANT
165 ip4_sv_reass_main_t ip4_sv_reass_main;
166 #endif /* CLIB_MARCH_VARIANT */
170 IP4_SV_REASSEMBLY_NEXT_INPUT,
171 IP4_SV_REASSEMBLY_NEXT_DROP,
172 IP4_SV_REASSEMBLY_NEXT_HANDOFF,
173 IP4_SV_REASSEMBLY_N_NEXT,
174 } ip4_sv_reass_next_t;
178 REASS_FRAGMENT_CACHE,
180 REASS_FRAGMENT_FORWARD,
182 } ip4_sv_reass_trace_operation_e;
186 ip4_sv_reass_trace_operation_e action;
192 } ip4_sv_reass_trace_t;
194 extern vlib_node_registration_t ip4_sv_reass_node;
195 extern vlib_node_registration_t ip4_sv_reass_node_feature;
198 format_ip4_sv_reass_trace (u8 * s, va_list * args)
200 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
201 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
202 ip4_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *);
203 if (REASS_PASSTHROUGH != t->action)
205 s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
209 case REASS_FRAGMENT_CACHE:
210 s = format (s, "[cached]");
214 format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
215 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
216 clib_net_to_host_u16 (t->l4_dst_port));
218 case REASS_FRAGMENT_FORWARD:
220 format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
221 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
222 clib_net_to_host_u16 (t->l4_dst_port));
224 case REASS_PASSTHROUGH:
225 s = format (s, "[not-fragmented]");
232 ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
233 ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass,
234 u32 bi, ip4_sv_reass_trace_operation_e action,
235 u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
237 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
238 ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
241 t->reass_id = reass->id;
242 t->op_id = reass->trace_op_counter;
243 ++reass->trace_op_counter;
246 t->ip_proto = ip_proto;
247 t->l4_src_port = l4_src_port;
248 t->l4_dst_port = l4_dst_port;
251 s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
252 printf ("%.*s\n", vec_len (s), s);
254 vec_reset_length (s);
260 ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
261 ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
263 clib_bihash_kv_16_8_t kv;
264 kv.key[0] = reass->key.as_u64[0];
265 kv.key[1] = reass->key.as_u64[1];
266 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
267 vlib_buffer_free (vm, reass->cached_buffers,
268 vec_len (reass->cached_buffers));
269 vec_free (reass->cached_buffers);
270 reass->cached_buffers = NULL;
271 if (~0 != reass->lru_prev)
273 ip4_sv_reass_t *lru_prev =
274 pool_elt_at_index (rt->pool, reass->lru_prev);
275 lru_prev->lru_next = reass->lru_next;
277 if (~0 != reass->lru_next)
279 ip4_sv_reass_t *lru_next =
280 pool_elt_at_index (rt->pool, reass->lru_next);
281 lru_next->lru_prev = reass->lru_prev;
283 if (rt->lru_first == reass - rt->pool)
285 rt->lru_first = reass->lru_next;
287 if (rt->lru_last == reass - rt->pool)
289 rt->lru_last = reass->lru_prev;
291 pool_put (rt->pool, reass);
296 ip4_sv_reass_init (ip4_sv_reass_t * reass)
298 reass->cached_buffers = NULL;
299 reass->is_complete = false;
302 always_inline ip4_sv_reass_t *
303 ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
304 ip4_sv_reass_per_thread_t * rt,
305 ip4_sv_reass_kv_t * kv, u8 * do_handoff)
307 ip4_sv_reass_t *reass = NULL;
308 f64 now = vlib_time_now (vm);
310 if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
312 if (vm->thread_index != kv->v.thread_index)
317 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
319 if (now > reass->last_heard + rm->timeout)
321 ip4_sv_reass_free (vm, rm, rt, reass);
328 reass->last_heard = now;
332 if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
334 reass = pool_elt_at_index (rt->pool, rt->lru_first);
335 ip4_sv_reass_free (vm, rm, rt, reass);
338 pool_get (rt->pool, reass);
339 clib_memset (reass, 0, sizeof (*reass));
340 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
342 ip4_sv_reass_init (reass);
344 reass->lru_prev = reass->lru_next = ~0;
346 if (~0 != rt->lru_last)
348 ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
349 reass->lru_prev = rt->lru_last;
350 lru_last->lru_next = rt->lru_last = reass - rt->pool;
353 if (~0 == rt->lru_first)
355 rt->lru_first = rt->lru_last = reass - rt->pool;
358 reass->key.as_u64[0] = kv->kv.key[0];
359 reass->key.as_u64[1] = kv->kv.key[1];
360 kv->v.reass_index = (reass - rt->pool);
361 kv->v.thread_index = vm->thread_index;
362 reass->last_heard = now;
364 if (clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 1))
366 ip4_sv_reass_free (vm, rm, rt, reass);
373 always_inline ip4_sv_reass_rc_t
374 ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
375 ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
376 ip4_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0)
378 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
379 ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
380 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
381 if (0 == fragment_first)
383 reass->ip_proto = ip0->protocol;
384 reass->l4_src_port = ip4_get_port (ip0, 1);
385 reass->l4_dst_port = ip4_get_port (ip0, 0);
386 if (!reass->l4_src_port || !reass->l4_dst_port)
387 return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
388 if (IP_PROTOCOL_TCP == reass->ip_proto)
390 reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags;
391 reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number;
392 reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number;
394 else if (IP_PROTOCOL_ICMP == reass->ip_proto)
396 reass->icmp_type_or_tcp_flags =
397 ((icmp46_header_t *) (ip0 + 1))->type;
399 reass->is_complete = true;
400 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
401 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
403 ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
404 reass->ip_proto, reass->l4_src_port,
408 vec_add1 (reass->cached_buffers, bi0);
409 if (!reass->is_complete)
411 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
413 ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
414 REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
416 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
418 rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
425 ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
426 vlib_frame_t * frame, bool is_feature,
427 bool is_output_feature, bool is_custom)
429 u32 *from = vlib_frame_vector_args (frame);
430 u32 n_left_from, n_left_to_next, *to_next, next_index;
431 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
432 ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
433 clib_spinlock_lock (&rt->lock);
435 n_left_from = frame->n_vectors;
436 next_index = node->cached_next_index;
438 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
439 vlib_get_buffers (vm, from, bufs, n_left_from);
440 u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
443 /* optimistic case first - no fragments */
444 while (n_left_from >= 2)
446 vlib_buffer_t *b0, *b1;
453 /* Prefetch next iteration. */
454 if (PREDICT_TRUE (n_left_from >= 4))
456 vlib_buffer_t *p2, *p3;
461 vlib_prefetch_buffer_header (p2, LOAD);
462 vlib_prefetch_buffer_header (p3, LOAD);
464 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
465 CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
469 (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
470 (is_output_feature ? 1 : 0) *
472 ip.save_rewrite_length);
474 (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b1),
475 (is_output_feature ? 1 : 0) *
477 ip.save_rewrite_length);
479 (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0))
480 || (ip4_get_fragment_more (ip1) || ip4_get_fragment_offset (ip1)))
482 // fragment found, go slow path
486 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
493 vnet_feature_next (&next0, b0);
497 next0 = is_custom ? vnet_buffer (b0)->ip.reass.next_index :
498 IP4_SV_REASSEMBLY_NEXT_INPUT;
500 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
501 vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
502 if (IP_PROTOCOL_TCP == ip0->protocol)
504 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
505 ((tcp_header_t *) (ip0 + 1))->flags;
506 vnet_buffer (b0)->ip.reass.tcp_ack_number =
507 ((tcp_header_t *) (ip0 + 1))->ack_number;
508 vnet_buffer (b0)->ip.reass.tcp_seq_number =
509 ((tcp_header_t *) (ip0 + 1))->seq_number;
511 else if (IP_PROTOCOL_ICMP == ip0->protocol)
513 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
514 ((icmp46_header_t *) (ip0 + 1))->type;
516 vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
517 vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
518 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
520 ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 2) - bufs],
522 vnet_buffer (b0)->ip.reass.ip_proto,
523 vnet_buffer (b0)->ip.reass.l4_src_port,
524 vnet_buffer (b0)->ip.reass.l4_dst_port);
528 vnet_feature_next (&next1, b1);
532 next1 = is_custom ? vnet_buffer (b1)->ip.reass.next_index :
533 IP4_SV_REASSEMBLY_NEXT_INPUT;
535 vnet_buffer (b1)->ip.reass.is_non_first_fragment = 0;
536 vnet_buffer (b1)->ip.reass.ip_proto = ip1->protocol;
537 if (IP_PROTOCOL_TCP == ip1->protocol)
539 vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
540 ((tcp_header_t *) (ip1 + 1))->flags;
541 vnet_buffer (b1)->ip.reass.tcp_ack_number =
542 ((tcp_header_t *) (ip1 + 1))->ack_number;
543 vnet_buffer (b1)->ip.reass.tcp_seq_number =
544 ((tcp_header_t *) (ip1 + 1))->seq_number;
546 else if (IP_PROTOCOL_ICMP == ip1->protocol)
548 vnet_buffer (b1)->ip.reass.icmp_type_or_tcp_flags =
549 ((icmp46_header_t *) (ip1 + 1))->type;
551 vnet_buffer (b1)->ip.reass.l4_src_port = ip4_get_port (ip1, 1);
552 vnet_buffer (b1)->ip.reass.l4_dst_port = ip4_get_port (ip1, 0);
553 if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
555 ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
557 vnet_buffer (b1)->ip.reass.ip_proto,
558 vnet_buffer (b1)->ip.reass.l4_src_port,
559 vnet_buffer (b1)->ip.reass.l4_dst_port);
568 while (n_left_from > 0)
576 (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
577 (is_output_feature ? 1 : 0) *
579 ip.save_rewrite_length);
581 (ip4_get_fragment_more (ip0) || ip4_get_fragment_offset (ip0)))
583 // fragment found, go slow path
587 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
594 vnet_feature_next (&next0, b0);
599 is_custom ? vnet_buffer (b0)->ip.
600 reass.next_index : IP4_SV_REASSEMBLY_NEXT_INPUT;
602 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
603 vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
604 if (IP_PROTOCOL_TCP == ip0->protocol)
606 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
607 ((tcp_header_t *) (ip0 + 1))->flags;
608 vnet_buffer (b0)->ip.reass.tcp_ack_number =
609 ((tcp_header_t *) (ip0 + 1))->ack_number;
610 vnet_buffer (b0)->ip.reass.tcp_seq_number =
611 ((tcp_header_t *) (ip0 + 1))->seq_number;
613 else if (IP_PROTOCOL_ICMP == ip0->protocol)
615 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
616 ((icmp46_header_t *) (ip0 + 1))->type;
618 vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
619 vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
620 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
622 ip4_sv_reass_add_trace (vm, node, rm, NULL, from[(b - 1) - bufs],
624 vnet_buffer (b0)->ip.reass.ip_proto,
625 vnet_buffer (b0)->ip.reass.l4_src_port,
626 vnet_buffer (b0)->ip.reass.l4_dst_port);
634 vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
643 while (n_left_from > 0)
645 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
647 while (n_left_from > 0 && n_left_to_next > 0)
652 u32 error0 = IP4_ERROR_NONE;
655 b0 = vlib_get_buffer (vm, bi0);
658 (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
659 (is_output_feature ? 1 : 0) *
661 ip.save_rewrite_length);
662 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
664 // this is a regular packet - no fragmentation
667 next0 = vnet_buffer (b0)->ip.reass.next_index;
671 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
673 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
674 vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
675 if (IP_PROTOCOL_TCP == ip0->protocol)
677 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
678 ((tcp_header_t *) (ip0 + 1))->flags;
679 vnet_buffer (b0)->ip.reass.tcp_ack_number =
680 ((tcp_header_t *) (ip0 + 1))->ack_number;
681 vnet_buffer (b0)->ip.reass.tcp_seq_number =
682 ((tcp_header_t *) (ip0 + 1))->seq_number;
684 else if (IP_PROTOCOL_ICMP == ip0->protocol)
686 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
687 ((icmp46_header_t *) (ip0 + 1))->type;
689 vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
690 vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
691 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
693 ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0,
695 vnet_buffer (b0)->ip.reass.ip_proto,
696 vnet_buffer (b0)->ip.
698 vnet_buffer (b0)->ip.
703 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
704 const u32 fragment_length =
705 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
706 const u32 fragment_last = fragment_first + fragment_length - 1;
707 if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791
709 next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
710 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
711 b0->error = node->errors[error0];
714 ip4_sv_reass_kv_t kv;
718 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
719 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
720 (u64) ip0->src_address.as_u32 << 32;
722 (u64) ip0->dst_address.
723 as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
725 ip4_sv_reass_t *reass =
726 ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
728 if (PREDICT_FALSE (do_handoff))
730 next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
731 vnet_buffer (b0)->ip.reass.owner_thread_index =
738 next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
739 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
740 b0->error = node->errors[error0];
744 if (reass->is_complete)
748 next0 = vnet_buffer (b0)->ip.reass.next_index;
752 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
754 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
756 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
757 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
758 reass->icmp_type_or_tcp_flags;
759 vnet_buffer (b0)->ip.reass.tcp_ack_number =
760 reass->tcp_ack_number;
761 vnet_buffer (b0)->ip.reass.tcp_seq_number =
762 reass->tcp_seq_number;
763 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
764 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
765 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
767 ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
768 REASS_FRAGMENT_FORWARD,
776 ip4_sv_reass_rc_t rc =
777 ip4_sv_reass_update (vm, node, rm, rt, ip0, reass, bi0);
780 case IP4_SV_REASS_RC_OK:
781 /* nothing to do here */
783 case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
784 vlib_node_increment_counter (vm, node->node_index,
785 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
787 ip4_sv_reass_free (vm, rm, rt, reass);
790 case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
791 vlib_node_increment_counter (vm, node->node_index,
792 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
794 ip4_sv_reass_free (vm, rm, rt, reass);
798 if (reass->is_complete)
801 vec_foreach_index (idx, reass->cached_buffers)
803 u32 bi0 = vec_elt (reass->cached_buffers, idx);
804 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
806 (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0),
807 (is_output_feature ? 1 : 0) *
809 ip.save_rewrite_length);
810 u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
813 vnet_feature_next (&next0, b0);
817 next0 = vnet_buffer (b0)->ip.reass.next_index;
819 if (0 == n_left_to_next)
821 vlib_put_next_frame (vm, node, next_index,
823 vlib_get_next_frame (vm, node, next_index, to_next,
829 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
830 ! !ip4_get_fragment_offset (ip0);
831 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
832 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
833 reass->icmp_type_or_tcp_flags;
834 vnet_buffer (b0)->ip.reass.tcp_ack_number =
835 reass->tcp_ack_number;
836 vnet_buffer (b0)->ip.reass.tcp_seq_number =
837 reass->tcp_seq_number;
838 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
839 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
840 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
842 ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
843 REASS_FRAGMENT_FORWARD,
848 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
849 to_next, n_left_to_next, bi0,
852 _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
860 if (is_feature && IP4_ERROR_NONE == error0)
862 b0 = vlib_get_buffer (vm, bi0);
863 vnet_feature_next (&next0, b0);
865 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
866 to_next, n_left_to_next,
874 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
878 clib_spinlock_unlock (&rt->lock);
879 return frame->n_vectors;
882 static char *ip4_sv_reass_error_strings[] = {
883 #define _(sym, string) string,
888 VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
889 vlib_node_runtime_t * node,
890 vlib_frame_t * frame)
892 return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
893 false /* is_output_feature */ ,
894 false /* is_custom */ );
898 VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
899 .name = "ip4-sv-reassembly",
900 .vector_size = sizeof (u32),
901 .format_trace = format_ip4_sv_reass_trace,
902 .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
903 .error_strings = ip4_sv_reass_error_strings,
904 .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
907 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
908 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
909 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
915 VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
916 vlib_node_runtime_t * node,
917 vlib_frame_t * frame)
919 return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
920 false /* is_output_feature */ ,
921 false /* is_custom */ );
925 VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
926 .name = "ip4-sv-reassembly-feature",
927 .vector_size = sizeof (u32),
928 .format_trace = format_ip4_sv_reass_trace,
929 .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
930 .error_strings = ip4_sv_reass_error_strings,
931 .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
934 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
935 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
936 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
942 VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
943 .arc_name = "ip4-unicast",
944 .node_name = "ip4-sv-reassembly-feature",
945 .runs_before = VNET_FEATURES ("ip4-lookup"),
950 VLIB_NODE_FN (ip4_sv_reass_node_output_feature) (vlib_main_t * vm,
951 vlib_node_runtime_t * node,
952 vlib_frame_t * frame)
954 return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
955 true /* is_output_feature */ ,
956 false /* is_custom */ );
961 VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = {
962 .name = "ip4-sv-reassembly-output-feature",
963 .vector_size = sizeof (u32),
964 .format_trace = format_ip4_sv_reass_trace,
965 .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
966 .error_strings = ip4_sv_reass_error_strings,
967 .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
970 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
971 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
972 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
978 VNET_FEATURE_INIT (ip4_sv_reass_output_feature) = {
979 .arc_name = "ip4-output",
980 .node_name = "ip4-sv-reassembly-output-feature",
987 VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
988 .name = "ip4-sv-reassembly-custom-next",
989 .vector_size = sizeof (u32),
990 .format_trace = format_ip4_sv_reass_trace,
991 .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
992 .error_strings = ip4_sv_reass_error_strings,
993 .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
996 [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
997 [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
998 [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
1004 VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
1005 vlib_node_runtime_t * node,
1006 vlib_frame_t * frame)
1008 return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
1009 false /* is_output_feature */ ,
1010 true /* is_custom */ );
1013 #ifndef CLIB_MARCH_VARIANT
1015 ip4_sv_reass_get_nbuckets ()
1017 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1021 nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
1023 for (i = 0; i < 31; i++)
1024 if ((1 << i) >= nbuckets)
1030 #endif /* CLIB_MARCH_VARIANT */
1034 IP4_EVENT_CONFIG_CHANGED = 1,
1035 } ip4_sv_reass_event_t;
1040 clib_bihash_16_8_t *new_hash;
1041 } ip4_rehash_cb_ctx;
1043 #ifndef CLIB_MARCH_VARIANT
1045 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1047 ip4_rehash_cb_ctx *ctx = _ctx;
1048 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1052 return (BIHASH_WALK_CONTINUE);
1056 ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1057 u32 max_reassembly_length,
1058 u32 expire_walk_interval_ms)
1060 ip4_sv_reass_main.timeout_ms = timeout_ms;
1061 ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1062 ip4_sv_reass_main.max_reass_n = max_reassemblies;
1063 ip4_sv_reass_main.max_reass_len = max_reassembly_length;
1064 ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1068 ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
1069 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1071 u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
1072 ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
1073 max_reassembly_length, expire_walk_interval_ms);
1074 vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
1075 ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
1076 IP4_EVENT_CONFIG_CHANGED, 0);
1077 u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
1078 if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1080 clib_bihash_16_8_t new_hash;
1081 clib_memset (&new_hash, 0, sizeof (new_hash));
1082 ip4_rehash_cb_ctx ctx;
1084 ctx.new_hash = &new_hash;
1085 clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1086 new_nbuckets * 1024);
1087 clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
1088 ip4_rehash_cb, &ctx);
1091 clib_bihash_free_16_8 (&new_hash);
1096 clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
1097 clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
1098 sizeof (ip4_sv_reass_main.hash));
1099 clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
1106 ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1107 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
1109 *timeout_ms = ip4_sv_reass_main.timeout_ms;
1110 *max_reassemblies = ip4_sv_reass_main.max_reass_n;
1111 *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
1112 *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
1116 static clib_error_t *
1117 ip4_sv_reass_init_function (vlib_main_t * vm)
1119 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1120 clib_error_t *error = 0;
1125 rm->vnet_main = vnet_get_main ();
1127 vec_validate (rm->per_thread_data, vlib_num_workers ());
1128 ip4_sv_reass_per_thread_t *rt;
1129 vec_foreach (rt, rm->per_thread_data)
1131 clib_spinlock_init (&rt->lock);
1132 pool_alloc (rt->pool, rm->max_reass_n);
1133 rt->lru_first = rt->lru_last = ~0;
1136 node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
1138 rm->ip4_sv_reass_expire_node_idx = node->index;
1140 ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
1141 IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
1142 IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1143 IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1145 nbuckets = ip4_sv_reass_get_nbuckets ();
1146 clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1148 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1150 rm->ip4_drop_idx = node->index;
1152 rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
1153 rm->fq_feature_index =
1154 vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
1156 rm->feature_use_refcount_per_intf = NULL;
1157 rm->output_feature_use_refcount_per_intf = NULL;
1162 VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
1163 #endif /* CLIB_MARCH_VARIANT */
1166 ip4_sv_reass_walk_expired (vlib_main_t * vm,
1167 vlib_node_runtime_t * node, vlib_frame_t * f)
1169 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1170 uword event_type, *event_data = 0;
1174 vlib_process_wait_for_event_or_clock (vm,
1176 rm->expire_walk_interval_ms /
1177 (f64) MSEC_PER_SEC);
1178 event_type = vlib_process_get_events (vm, &event_data);
1182 case ~0: /* no events => timeout */
1183 /* nothing to do here */
1185 case IP4_EVENT_CONFIG_CHANGED:
1188 clib_warning ("BUG: event type 0x%wx", event_type);
1191 f64 now = vlib_time_now (vm);
1193 ip4_sv_reass_t *reass;
1194 int *pool_indexes_to_free = NULL;
1196 uword thread_index = 0;
1198 const uword nthreads = vlib_num_workers () + 1;
1199 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1201 ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1202 clib_spinlock_lock (&rt->lock);
1204 vec_reset_length (pool_indexes_to_free);
1206 pool_foreach_index (index, rt->pool) {
1207 reass = pool_elt_at_index (rt->pool, index);
1208 if (now > reass->last_heard + rm->timeout)
1210 vec_add1 (pool_indexes_to_free, index);
1216 vec_foreach (i, pool_indexes_to_free)
1218 ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1219 ip4_sv_reass_free (vm, rm, rt, reass);
1223 clib_spinlock_unlock (&rt->lock);
1226 vec_free (pool_indexes_to_free);
1229 _vec_len (event_data) = 0;
1237 VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
1238 .function = ip4_sv_reass_walk_expired,
1239 .type = VLIB_NODE_TYPE_PROCESS,
1240 .name = "ip4-sv-reassembly-expire-walk",
1241 .format_trace = format_ip4_sv_reass_trace,
1242 .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
1243 .error_strings = ip4_sv_reass_error_strings,
1249 format_ip4_sv_reass_key (u8 * s, va_list * args)
1251 ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
1254 "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1255 key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1256 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1261 format_ip4_sv_reass (u8 * s, va_list * args)
1263 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1264 ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
1266 s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
1267 reass->id, format_ip4_sv_reass_key, &reass->key,
1268 reass->trace_op_counter);
1273 vec_foreach (bip, reass->cached_buffers)
1278 b = vlib_get_buffer (vm, bi);
1279 s = format (s, " #%03u: bi: %u, ", counter, bi);
1281 bi = b->next_buffer;
1283 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1288 static clib_error_t *
1289 show_ip4_reass (vlib_main_t * vm,
1290 unformat_input_t * input,
1291 CLIB_UNUSED (vlib_cli_command_t * lmd))
1293 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1295 vlib_cli_output (vm, "---------------------");
1296 vlib_cli_output (vm, "IP4 reassembly status");
1297 vlib_cli_output (vm, "---------------------");
1298 bool details = false;
1299 if (unformat (input, "details"))
1304 u32 sum_reass_n = 0;
1305 ip4_sv_reass_t *reass;
1307 const uword nthreads = vlib_num_workers () + 1;
1308 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1310 ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1311 clib_spinlock_lock (&rt->lock);
1315 pool_foreach (reass, rt->pool) {
1316 vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
1320 sum_reass_n += rt->reass_n;
1321 clib_spinlock_unlock (&rt->lock);
1323 vlib_cli_output (vm, "---------------------");
1324 vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1325 (long unsigned) sum_reass_n);
1326 vlib_cli_output (vm,
1327 "Maximum configured concurrent shallow virtual IP4 reassemblies per worker-thread: %lu\n",
1328 (long unsigned) rm->max_reass_n);
1329 vlib_cli_output (vm,
1330 "Maximum configured shallow virtual IP4 reassembly timeout: %lums\n",
1331 (long unsigned) rm->timeout_ms);
1332 vlib_cli_output (vm,
1333 "Maximum configured shallow virtual IP4 reassembly expire walk interval: %lums\n",
1334 (long unsigned) rm->expire_walk_interval_ms);
1339 VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
1340 .path = "show ip4-sv-reassembly",
1341 .short_help = "show ip4-sv-reassembly [details]",
1342 .function = show_ip4_reass,
1346 #ifndef CLIB_MARCH_VARIANT
1348 ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1350 return ip4_sv_reass_enable_disable_with_refcnt (sw_if_index,
1353 #endif /* CLIB_MARCH_VARIANT */
1356 #define foreach_ip4_sv_reass_handoff_error \
1357 _(CONGESTION_DROP, "congestion drop")
1362 #define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1363 foreach_ip4_sv_reass_handoff_error
1365 IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
1366 } ip4_sv_reass_handoff_error_t;
1368 static char *ip4_sv_reass_handoff_error_strings[] = {
1369 #define _(sym,string) string,
1370 foreach_ip4_sv_reass_handoff_error
1376 u32 next_worker_index;
1377 } ip4_sv_reass_handoff_trace_t;
1380 format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
1382 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1383 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1384 ip4_sv_reass_handoff_trace_t *t =
1385 va_arg (*args, ip4_sv_reass_handoff_trace_t *);
1388 format (s, "ip4-sv-reassembly-handoff: next-worker %d",
1389 t->next_worker_index);
1395 ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
1396 vlib_node_runtime_t * node,
1397 vlib_frame_t * frame, bool is_feature)
1399 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1401 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1402 u32 n_enq, n_left_from, *from;
1403 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1406 from = vlib_frame_vector_args (frame);
1407 n_left_from = frame->n_vectors;
1408 vlib_get_buffers (vm, from, bufs, n_left_from);
1411 ti = thread_indices;
1413 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1415 while (n_left_from > 0)
1417 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1420 ((node->flags & VLIB_NODE_FLAG_TRACE)
1421 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1423 ip4_sv_reass_handoff_trace_t *t =
1424 vlib_add_trace (vm, node, b[0], sizeof (*t));
1425 t->next_worker_index = ti[0];
1433 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1434 frame->n_vectors, 1);
1436 if (n_enq < frame->n_vectors)
1437 vlib_node_increment_counter (vm, node->node_index,
1438 IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1439 frame->n_vectors - n_enq);
1440 return frame->n_vectors;
1443 VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
1444 vlib_node_runtime_t * node,
1445 vlib_frame_t * frame)
1447 return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1448 false /* is_feature */ );
1453 VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
1454 .name = "ip4-sv-reassembly-handoff",
1455 .vector_size = sizeof (u32),
1456 .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1457 .error_strings = ip4_sv_reass_handoff_error_strings,
1458 .format_trace = format_ip4_sv_reass_handoff_trace,
1470 VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
1471 vlib_node_runtime_t *
1473 vlib_frame_t * frame)
1475 return ip4_sv_reass_handoff_node_inline (vm, node, frame,
1476 true /* is_feature */ );
1482 VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
1483 .name = "ip4-sv-reass-feature-hoff",
1484 .vector_size = sizeof (u32),
1485 .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
1486 .error_strings = ip4_sv_reass_handoff_error_strings,
1487 .format_trace = format_ip4_sv_reass_handoff_trace,
1497 #ifndef CLIB_MARCH_VARIANT
1499 ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1501 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1502 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1505 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1507 ++rm->feature_use_refcount_per_intf[sw_if_index];
1508 return vnet_feature_enable_disable ("ip4-unicast",
1509 "ip4-sv-reassembly-feature",
1510 sw_if_index, 1, 0, 0);
1512 ++rm->feature_use_refcount_per_intf[sw_if_index];
1516 if (rm->feature_use_refcount_per_intf[sw_if_index])
1517 --rm->feature_use_refcount_per_intf[sw_if_index];
1518 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1519 return vnet_feature_enable_disable ("ip4-unicast",
1520 "ip4-sv-reassembly-feature",
1521 sw_if_index, 0, 0, 0);
1527 ip4_sv_reass_custom_register_next_node (uword node_index)
1529 return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
1534 ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index,
1537 ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
1538 vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index);
1541 if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1543 ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1544 return vnet_feature_enable_disable ("ip4-output",
1545 "ip4-sv-reassembly-output-feature",
1546 sw_if_index, 1, 0, 0);
1548 ++rm->output_feature_use_refcount_per_intf[sw_if_index];
1552 if (rm->output_feature_use_refcount_per_intf[sw_if_index])
1553 --rm->output_feature_use_refcount_per_intf[sw_if_index];
1554 if (!rm->output_feature_use_refcount_per_intf[sw_if_index])
1555 return vnet_feature_enable_disable ("ip4-output",
1556 "ip4-sv-reassembly-output-feature",
1557 sw_if_index, 0, 0, 0);
1564 * fd.io coding-style-patch-verification: ON
1567 * eval: (c-set-style "gnu")