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 Full Reassembly.
20 * This file contains the source code for IPv4 full reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vppinfra/fifo.h>
27 #include <vppinfra/bihash_16_8.h>
28 #include <vnet/ip/reass/ip4_full_reass.h>
31 #define MSEC_PER_SEC 1000
32 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
33 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
34 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
35 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
36 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
38 #define IP4_REASS_DEBUG_BUFFERS 0
39 #if IP4_REASS_DEBUG_BUFFERS
40 #define IP4_REASS_DEBUG_BUFFER(bi, what) \
44 printf (#what "buffer %u", _bi); \
45 vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
46 while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \
48 _bi = _b->next_buffer; \
49 printf ("[%u]", _bi); \
50 _b = vlib_get_buffer (vm, _bi); \
57 #define IP4_REASS_DEBUG_BUFFER(...)
63 IP4_REASS_RC_TOO_MANY_FRAGMENTS,
64 IP4_REASS_RC_INTERNAL_ERROR,
67 } ip4_full_reass_rc_t;
84 } ip4_full_reass_key_t;
91 u32 memory_owner_thread_index;
94 } ip4_full_reass_val_t;
100 ip4_full_reass_key_t k;
101 ip4_full_reass_val_t v;
103 clib_bihash_kv_16_8_t kv;
104 } ip4_full_reass_kv_t;
107 ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
109 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
110 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
114 ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
116 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
117 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
118 (vnb->ip.reass.fragment_first +
119 ip4_full_reass_buffer_get_data_offset (b)) + 1;
125 ip4_full_reass_key_t key;
126 // time when last packet was received
128 // internal id of this reassembly
130 // buffer index of first buffer in this reassembly context
132 // last octet of packet, ~0 until fragment without more_fragments arrives
133 u32 last_packet_octet;
134 // length of data collected so far
136 // trace operation counter
137 u32 trace_op_counter;
138 // next index - used by non-feature node
140 // error next index - used by custom apps (~0 if not used)
141 u32 error_next_index;
142 // minimum fragment length for this reassembly - used to estimate MTU
143 u16 min_fragment_length;
144 // number of fragments in this reassembly
146 // thread owning memory for this context (whose pool contains this ctx)
147 u32 memory_owner_thread_index;
148 // thread which received fragment with offset 0 and which sends out the
149 // completed reassembly
150 u32 sendout_thread_index;
155 ip4_full_reass_t *pool;
158 clib_spinlock_t lock;
159 } ip4_full_reass_per_thread_t;
166 u32 expire_walk_interval_ms;
167 // maximum number of fragments in one reassembly
169 // maximum number of reassemblies
173 clib_bihash_16_8_t hash;
175 ip4_full_reass_per_thread_t *per_thread_data;
178 vlib_main_t *vlib_main;
180 // node index of ip4-drop node
182 u32 ip4_full_reass_expire_node_idx;
184 /** Worker handoff */
186 u32 fq_feature_index;
188 // reference count for enabling/disabling feature - per interface
189 u32 *feature_use_refcount_per_intf;
190 } ip4_full_reass_main_t;
192 extern ip4_full_reass_main_t ip4_full_reass_main;
194 #ifndef CLIB_MARCH_VARIANT
195 ip4_full_reass_main_t ip4_full_reass_main;
196 #endif /* CLIB_MARCH_VARIANT */
200 IP4_FULL_REASS_NEXT_INPUT,
201 IP4_FULL_REASS_NEXT_DROP,
202 IP4_FULL_REASS_NEXT_HANDOFF,
203 IP4_FULL_REASS_N_NEXT,
204 } ip4_full_reass_next_t;
214 } ip4_full_reass_trace_operation_e;
224 } ip4_full_reass_range_trace_t;
228 ip4_full_reass_trace_operation_e action;
230 ip4_full_reass_range_trace_t trace_range;
238 bool is_after_handoff;
239 ip4_header_t ip4_header;
240 } ip4_full_reass_trace_t;
242 extern vlib_node_registration_t ip4_full_reass_node;
243 extern vlib_node_registration_t ip4_full_reass_node_feature;
246 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
247 ip4_full_reass_range_trace_t * trace)
249 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
250 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
251 trace->range_first = vnb->ip.reass.range_first;
252 trace->range_last = vnb->ip.reass.range_last;
253 trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
254 trace->data_len = ip4_full_reass_buffer_get_data_len (b);
255 trace->range_bi = bi;
259 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
261 ip4_full_reass_range_trace_t *trace =
262 va_arg (*args, ip4_full_reass_range_trace_t *);
264 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
265 trace->range_last, trace->data_offset, trace->data_len,
271 format_ip4_full_reass_trace (u8 * s, va_list * args)
273 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
274 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
275 ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
277 if (~0 != t->reass_id)
279 if (t->is_after_handoff)
282 format (s, "%U\n", format_ip4_header, &t->ip4_header,
283 sizeof (t->ip4_header));
287 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
288 t->reass_id, t->op_id);
289 indent = format_get_indent (s);
292 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
293 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
299 s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
300 format_ip4_full_reass_range_trace, &t->trace_range,
304 s = format (s, "\n%Udiscard %U", format_white_space, indent,
305 format_ip4_full_reass_range_trace, &t->trace_range);
308 s = format (s, "\n%Unew %U", format_white_space, indent,
309 format_ip4_full_reass_range_trace, &t->trace_range);
312 s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
313 format_ip4_full_reass_range_trace, &t->trace_range);
316 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
320 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
328 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
329 ip4_full_reass_main_t * rm,
330 ip4_full_reass_t * reass, u32 bi,
331 ip4_full_reass_trace_operation_e action,
332 u32 size_diff, u32 thread_id_to)
334 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
335 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
336 bool is_after_handoff = false;
337 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
339 is_after_handoff = true;
341 ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
342 t->is_after_handoff = is_after_handoff;
343 if (t->is_after_handoff)
345 clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
346 clib_min (sizeof (t->ip4_header), b->current_length));
350 t->reass_id = reass->id;
351 t->op_id = reass->trace_op_counter;
352 t->trace_range.first_bi = reass->first_bi;
353 t->total_data_len = reass->data_len;
354 ++reass->trace_op_counter;
360 t->trace_range.first_bi = 0;
361 t->total_data_len = 0;
364 ip4_full_reass_trace_details (vm, bi, &t->trace_range);
365 t->size_diff = size_diff;
366 t->thread_id = vm->thread_index;
367 t->thread_id_to = thread_id_to;
368 t->fragment_first = vnb->ip.reass.fragment_first;
369 t->fragment_last = vnb->ip.reass.fragment_last;
372 s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
373 printf ("%.*s\n", vec_len (s), s);
375 vec_reset_length (s);
380 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
381 ip4_full_reass_t * reass)
383 pool_put (rt->pool, reass);
388 ip4_full_reass_free (ip4_full_reass_main_t * rm,
389 ip4_full_reass_per_thread_t * rt,
390 ip4_full_reass_t * reass)
392 clib_bihash_kv_16_8_t kv;
393 kv.key[0] = reass->key.as_u64[0];
394 kv.key[1] = reass->key.as_u64[1];
395 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
396 return ip4_full_reass_free_ctx (rt, reass);
400 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
401 ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
403 u32 range_bi = reass->first_bi;
404 vlib_buffer_t *range_b;
405 vnet_buffer_opaque_t *range_vnb;
407 while (~0 != range_bi)
409 range_b = vlib_get_buffer (vm, range_bi);
410 range_vnb = vnet_buffer (range_b);
414 vec_add1 (to_free, bi);
415 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
416 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
419 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
426 range_bi = range_vnb->ip.reass.next_range_bi;
428 /* send to next_error_index */
429 if (~0 != reass->error_next_index)
431 u32 n_left_to_next, *to_next, next_index;
433 next_index = reass->error_next_index;
436 while (vec_len (to_free) > 0)
438 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
440 while (vec_len (to_free) > 0 && n_left_to_next > 0)
442 bi = vec_pop (to_free);
451 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
456 vlib_buffer_free (vm, to_free, vec_len (to_free));
461 ip4_full_reass_init (ip4_full_reass_t * reass)
463 reass->first_bi = ~0;
464 reass->last_packet_octet = ~0;
466 reass->next_index = ~0;
467 reass->error_next_index = ~0;
470 always_inline ip4_full_reass_t *
471 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
472 ip4_full_reass_main_t * rm,
473 ip4_full_reass_per_thread_t * rt,
474 ip4_full_reass_kv_t * kv, u8 * do_handoff)
476 ip4_full_reass_t *reass;
482 now = vlib_time_now (vm);
483 if (!clib_bihash_search_16_8
484 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv))
487 pool_elt_at_index (rm->per_thread_data
488 [kv->v.memory_owner_thread_index].pool,
490 if (vm->thread_index != reass->memory_owner_thread_index)
496 if (now > reass->last_heard + rm->timeout)
498 ip4_full_reass_drop_all (vm, node, rm, reass);
499 ip4_full_reass_free (rm, rt, reass);
506 reass->last_heard = now;
510 if (rt->reass_n >= rm->max_reass_n)
517 pool_get (rt->pool, reass);
518 clib_memset (reass, 0, sizeof (*reass));
519 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
520 reass->memory_owner_thread_index = vm->thread_index;
522 ip4_full_reass_init (reass);
526 reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0];
527 reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1];
528 kv->v.reass_index = (reass - rt->pool);
529 kv->v.memory_owner_thread_index = vm->thread_index;
530 reass->last_heard = now;
533 clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 2);
536 ip4_full_reass_free_ctx (rt, reass);
538 // if other worker created a context already work with the other copy
546 always_inline ip4_full_reass_rc_t
547 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
548 ip4_full_reass_main_t * rm,
549 ip4_full_reass_per_thread_t * rt,
550 ip4_full_reass_t * reass, u32 * bi0,
551 u32 * next0, u32 * error0, bool is_custom_app)
553 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
554 vlib_buffer_t *last_b = NULL;
555 u32 sub_chain_bi = reass->first_bi;
556 u32 total_length = 0;
560 u32 tmp_bi = sub_chain_bi;
561 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
562 ip4_header_t *ip = vlib_buffer_get_current (tmp);
563 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
564 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
565 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
567 return IP4_REASS_RC_INTERNAL_ERROR;
570 u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
572 ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
574 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
575 if (tmp_bi == reass->first_bi)
577 /* first buffer - keep ip4 header */
578 if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
580 return IP4_REASS_RC_INTERNAL_ERROR;
583 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
584 ip4_header_bytes (ip);
585 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
587 return IP4_REASS_RC_INTERNAL_ERROR;
591 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
597 if (trim_front > tmp->current_length)
599 /* drop whole buffer */
600 u32 to_be_freed_bi = tmp_bi;
601 trim_front -= tmp->current_length;
602 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
604 return IP4_REASS_RC_INTERNAL_ERROR;
606 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
607 tmp_bi = tmp->next_buffer;
608 tmp->next_buffer = 0;
609 tmp = vlib_get_buffer (vm, tmp_bi);
610 vlib_buffer_free_one (vm, to_be_freed_bi);
615 vlib_buffer_advance (tmp, trim_front);
623 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
624 last_b->next_buffer = tmp_bi;
627 if (keep_data <= tmp->current_length)
629 tmp->current_length = keep_data;
634 keep_data -= tmp->current_length;
635 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
637 return IP4_REASS_RC_INTERNAL_ERROR;
640 total_length += tmp->current_length;
641 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
643 tmp_bi = tmp->next_buffer;
644 tmp = vlib_get_buffer (vm, tmp->next_buffer);
653 u32 to_be_freed_bi = tmp_bi;
654 if (reass->first_bi == tmp_bi)
656 return IP4_REASS_RC_INTERNAL_ERROR;
658 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
660 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
661 tmp_bi = tmp->next_buffer;
662 tmp->next_buffer = 0;
663 tmp = vlib_get_buffer (vm, tmp_bi);
664 vlib_buffer_free_one (vm, to_be_freed_bi);
668 tmp->next_buffer = 0;
669 vlib_buffer_free_one (vm, to_be_freed_bi);
675 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
678 while (~0 != sub_chain_bi);
682 return IP4_REASS_RC_INTERNAL_ERROR;
684 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
686 if (total_length < first_b->current_length)
688 return IP4_REASS_RC_INTERNAL_ERROR;
690 total_length -= first_b->current_length;
691 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
692 first_b->total_length_not_including_first_buffer = total_length;
693 ip4_header_t *ip = vlib_buffer_get_current (first_b);
694 ip->flags_and_fragment_offset = 0;
695 ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
696 ip->checksum = ip4_header_checksum (ip);
697 if (!vlib_buffer_chain_linearize (vm, first_b))
699 return IP4_REASS_RC_NO_BUF;
701 // reset to reconstruct the mbuf linking
702 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
703 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
705 ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
708 // following code does a hexdump of packet fragments to stdout ...
711 u32 bi = reass->first_bi;
715 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
716 s = format (s, "%u: %U\n", bi, format_hexdump,
717 vlib_buffer_get_current (b), b->current_length);
718 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
727 printf ("%.*s\n", vec_len (s), s);
734 *bi0 = reass->first_bi;
737 *next0 = IP4_FULL_REASS_NEXT_INPUT;
741 *next0 = reass->next_index;
743 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
744 *error0 = IP4_ERROR_NONE;
745 ip4_full_reass_free (rm, rt, reass);
747 return IP4_REASS_RC_OK;
750 always_inline ip4_full_reass_rc_t
751 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
752 ip4_full_reass_main_t * rm,
753 ip4_full_reass_per_thread_t * rt,
754 ip4_full_reass_t * reass,
755 u32 prev_range_bi, u32 new_next_bi)
757 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
758 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
759 if (~0 != prev_range_bi)
761 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
762 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
763 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
764 prev_vnb->ip.reass.next_range_bi = new_next_bi;
768 if (~0 != reass->first_bi)
770 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
772 reass->first_bi = new_next_bi;
774 vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
775 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
776 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
778 return IP4_REASS_RC_INTERNAL_ERROR;
780 reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
781 return IP4_REASS_RC_OK;
784 always_inline ip4_full_reass_rc_t
785 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
786 vlib_node_runtime_t * node,
787 ip4_full_reass_main_t * rm,
788 ip4_full_reass_t * reass,
789 u32 prev_range_bi, u32 discard_bi)
791 vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
792 vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
793 if (~0 != prev_range_bi)
795 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
796 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
797 if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
799 return IP4_REASS_RC_INTERNAL_ERROR;
801 prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
805 reass->first_bi = discard_vnb->ip.reass.next_range_bi;
807 vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
808 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
809 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
811 return IP4_REASS_RC_INTERNAL_ERROR;
813 reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
816 u32 to_be_freed_bi = discard_bi;
817 if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
819 ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
820 RANGE_DISCARD, 0, ~0);
822 if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
824 discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
825 discard_bi = discard_b->next_buffer;
826 discard_b->next_buffer = 0;
827 discard_b = vlib_get_buffer (vm, discard_bi);
828 vlib_buffer_free_one (vm, to_be_freed_bi);
832 discard_b->next_buffer = 0;
833 vlib_buffer_free_one (vm, to_be_freed_bi);
837 return IP4_REASS_RC_OK;
840 always_inline ip4_full_reass_rc_t
841 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
842 ip4_full_reass_main_t * rm,
843 ip4_full_reass_per_thread_t * rt,
844 ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
845 u32 * error0, bool is_custom_app,
846 u32 * handoff_thread_idx)
848 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
849 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
852 // store (error_)next_index before it's overwritten
853 reass->next_index = fvnb->ip.reass.next_index;
854 reass->error_next_index = fvnb->ip.reass.error_next_index;
856 ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
858 ip4_header_t *fip = vlib_buffer_get_current (fb);
859 const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
860 const u32 fragment_length =
861 clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
862 const u32 fragment_last = fragment_first + fragment_length - 1;
863 fvnb->ip.reass.fragment_first = fragment_first;
864 fvnb->ip.reass.fragment_last = fragment_last;
865 int more_fragments = ip4_get_fragment_more (fip);
866 u32 candidate_range_bi = reass->first_bi;
867 u32 prev_range_bi = ~0;
868 fvnb->ip.reass.range_first = fragment_first;
869 fvnb->ip.reass.range_last = fragment_last;
870 fvnb->ip.reass.next_range_bi = ~0;
873 reass->last_packet_octet = fragment_last;
875 if (~0 == reass->first_bi)
877 // starting a new reassembly
879 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
880 prev_range_bi, *bi0);
881 if (IP4_REASS_RC_OK != rc)
885 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
887 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
891 reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
892 reass->fragments_n = 1;
893 return IP4_REASS_RC_OK;
895 reass->min_fragment_length =
896 clib_min (clib_net_to_host_u16 (fip->length),
897 fvnb->ip.reass.estimated_mtu);
898 while (~0 != candidate_range_bi)
900 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
901 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
902 if (fragment_first > candidate_vnb->ip.reass.range_last)
904 // this fragments starts after candidate range
905 prev_range_bi = candidate_range_bi;
906 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
907 if (candidate_vnb->ip.reass.range_last < fragment_last &&
908 ~0 == candidate_range_bi)
910 // special case - this fragment falls beyond all known ranges
912 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
913 prev_range_bi, *bi0);
914 if (IP4_REASS_RC_OK != rc)
923 if (fragment_last < candidate_vnb->ip.reass.range_first)
925 // this fragment ends before candidate range without any overlap
927 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
928 prev_range_bi, *bi0);
929 if (IP4_REASS_RC_OK != rc)
937 if (fragment_first >= candidate_vnb->ip.reass.range_first &&
938 fragment_last <= candidate_vnb->ip.reass.range_last)
940 // this fragment is a (sub)part of existing range, ignore it
941 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
943 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
944 RANGE_OVERLAP, 0, ~0);
948 int discard_candidate = 0;
949 if (fragment_first < candidate_vnb->ip.reass.range_first)
952 fragment_last - candidate_vnb->ip.reass.range_first + 1;
953 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
955 candidate_vnb->ip.reass.range_first += overlap;
956 if (reass->data_len < overlap)
958 return IP4_REASS_RC_INTERNAL_ERROR;
960 reass->data_len -= overlap;
961 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
963 ip4_full_reass_add_trace (vm, node, rm, reass,
965 RANGE_SHRINK, 0, ~0);
968 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
971 if (IP4_REASS_RC_OK != rc)
979 discard_candidate = 1;
982 else if (fragment_last > candidate_vnb->ip.reass.range_last)
985 candidate_vnb->ip.reass.range_last - fragment_first + 1;
986 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
988 fvnb->ip.reass.range_first += overlap;
989 if (~0 != candidate_vnb->ip.reass.next_range_bi)
991 prev_range_bi = candidate_range_bi;
993 candidate_vnb->ip.reass.next_range_bi;
998 // special case - last range discarded
1000 ip4_full_reass_insert_range_in_chain (vm, rm, rt,
1004 if (IP4_REASS_RC_OK != rc)
1013 discard_candidate = 1;
1018 discard_candidate = 1;
1020 if (discard_candidate)
1022 u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1023 // discard candidate range, probe next range
1025 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1027 candidate_range_bi);
1028 if (IP4_REASS_RC_OK != rc)
1032 if (~0 != next_range_bi)
1034 candidate_range_bi = next_range_bi;
1039 // special case - last range discarded
1041 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1044 if (IP4_REASS_RC_OK != rc)
1054 ++reass->fragments_n;
1057 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1059 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1063 if (~0 != reass->last_packet_octet &&
1064 reass->data_len == reass->last_packet_octet + 1)
1066 *handoff_thread_idx = reass->sendout_thread_index;
1068 reass->memory_owner_thread_index != reass->sendout_thread_index;
1070 ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1072 if (IP4_REASS_RC_OK == rc && handoff)
1074 rc = IP4_REASS_RC_HANDOFF;
1082 if (reass->fragments_n > rm->max_reass_len)
1084 rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1089 *next0 = IP4_FULL_REASS_NEXT_DROP;
1090 *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1097 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1098 vlib_frame_t * frame, bool is_feature,
1101 u32 *from = vlib_frame_vector_args (frame);
1102 u32 n_left_from, n_left_to_next, *to_next, next_index;
1103 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1104 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1105 clib_spinlock_lock (&rt->lock);
1107 n_left_from = frame->n_vectors;
1108 next_index = node->cached_next_index;
1109 while (n_left_from > 0)
1111 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1113 while (n_left_from > 0 && n_left_to_next > 0)
1118 u32 error0 = IP4_ERROR_NONE;
1121 b0 = vlib_get_buffer (vm, bi0);
1123 ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1124 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1126 // this is a whole packet - no fragmentation
1129 next0 = IP4_FULL_REASS_NEXT_INPUT;
1133 next0 = vnet_buffer (b0)->ip.reass.next_index;
1135 goto packet_enqueue;
1137 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1138 const u32 fragment_length =
1139 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1140 const u32 fragment_last = fragment_first + fragment_length - 1;
1141 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
1143 next0 = IP4_FULL_REASS_NEXT_DROP;
1144 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1145 goto packet_enqueue;
1147 ip4_full_reass_kv_t kv;
1151 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1152 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1153 (u64) ip0->src_address.as_u32 << 32;
1155 (u64) ip0->dst_address.
1156 as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1158 ip4_full_reass_t *reass =
1159 ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1164 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1165 if (0 == fragment_first)
1167 reass->sendout_thread_index = vm->thread_index;
1171 if (PREDICT_FALSE (do_handoff))
1173 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1174 vnet_buffer (b0)->ip.reass.owner_thread_index =
1175 kv.v.memory_owner_thread_index;
1179 u32 handoff_thread_idx;
1180 switch (ip4_full_reass_update
1181 (vm, node, rm, rt, reass, &bi0, &next0,
1182 &error0, is_custom_app, &handoff_thread_idx))
1184 case IP4_REASS_RC_OK:
1185 /* nothing to do here */
1187 case IP4_REASS_RC_HANDOFF:
1188 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1189 b0 = vlib_get_buffer (vm, bi0);
1190 vnet_buffer (b0)->ip.reass.owner_thread_index =
1193 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1194 vlib_node_increment_counter (vm, node->node_index,
1195 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1197 ip4_full_reass_drop_all (vm, node, rm, reass);
1198 ip4_full_reass_free (rm, rt, reass);
1201 case IP4_REASS_RC_NO_BUF:
1202 vlib_node_increment_counter (vm, node->node_index,
1203 IP4_ERROR_REASS_NO_BUF, 1);
1204 ip4_full_reass_drop_all (vm, node, rm, reass);
1205 ip4_full_reass_free (rm, rt, reass);
1208 case IP4_REASS_RC_INTERNAL_ERROR:
1209 /* drop everything and start with a clean slate */
1210 vlib_node_increment_counter (vm, node->node_index,
1211 IP4_ERROR_REASS_INTERNAL_ERROR,
1213 ip4_full_reass_drop_all (vm, node, rm, reass);
1214 ip4_full_reass_free (rm, rt, reass);
1221 next0 = IP4_FULL_REASS_NEXT_DROP;
1222 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1232 n_left_to_next -= 1;
1234 /* bi0 might have been updated by reass_finalize, reload */
1235 b0 = vlib_get_buffer (vm, bi0);
1236 if (IP4_ERROR_NONE != error0)
1238 b0->error = node->errors[error0];
1241 if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1243 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1245 ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1247 vnet_buffer (b0)->ip.
1248 reass.owner_thread_index);
1251 else if (is_feature && IP4_ERROR_NONE == error0)
1253 vnet_feature_next (&next0, b0);
1255 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1256 to_next, n_left_to_next,
1258 IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1266 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1269 clib_spinlock_unlock (&rt->lock);
1270 return frame->n_vectors;
1273 static char *ip4_full_reass_error_strings[] = {
1274 #define _(sym, string) string,
1279 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1280 vlib_node_runtime_t * node,
1281 vlib_frame_t * frame)
1283 return ip4_full_reass_inline (vm, node, frame, false /* is_feature */ ,
1284 false /* is_custom_app */ );
1288 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1289 .name = "ip4-full-reassembly",
1290 .vector_size = sizeof (u32),
1291 .format_trace = format_ip4_full_reass_trace,
1292 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1293 .error_strings = ip4_full_reass_error_strings,
1294 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1297 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1298 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1299 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1305 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1306 vlib_node_runtime_t * node,
1307 vlib_frame_t * frame)
1309 return ip4_full_reass_inline (vm, node, frame, true /* is_feature */ ,
1310 false /* is_custom_app */ );
1314 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1315 .name = "ip4-full-reassembly-feature",
1316 .vector_size = sizeof (u32),
1317 .format_trace = format_ip4_full_reass_trace,
1318 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1319 .error_strings = ip4_full_reass_error_strings,
1320 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1323 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1324 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1325 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1331 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1332 .arc_name = "ip4-unicast",
1333 .node_name = "ip4-full-reassembly-feature",
1334 .runs_before = VNET_FEATURES ("ip4-lookup",
1335 "ipsec4-input-feature"),
1340 #ifndef CLIB_MARCH_VARIANT
1342 ip4_full_reass_get_nbuckets ()
1344 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1348 nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1350 for (i = 0; i < 31; i++)
1351 if ((1 << i) >= nbuckets)
1357 #endif /* CLIB_MARCH_VARIANT */
1361 IP4_EVENT_CONFIG_CHANGED = 1,
1362 } ip4_full_reass_event_t;
1367 clib_bihash_16_8_t *new_hash;
1368 } ip4_rehash_cb_ctx;
1370 #ifndef CLIB_MARCH_VARIANT
1372 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1374 ip4_rehash_cb_ctx *ctx = _ctx;
1375 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1379 return (BIHASH_WALK_CONTINUE);
1383 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1384 u32 max_reassembly_length,
1385 u32 expire_walk_interval_ms)
1387 ip4_full_reass_main.timeout_ms = timeout_ms;
1388 ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1389 ip4_full_reass_main.max_reass_n = max_reassemblies;
1390 ip4_full_reass_main.max_reass_len = max_reassembly_length;
1391 ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1395 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1396 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1398 u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1399 ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1400 max_reassembly_length, expire_walk_interval_ms);
1401 vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1402 ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1403 IP4_EVENT_CONFIG_CHANGED, 0);
1404 u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1405 if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1407 clib_bihash_16_8_t new_hash;
1408 clib_memset (&new_hash, 0, sizeof (new_hash));
1409 ip4_rehash_cb_ctx ctx;
1411 ctx.new_hash = &new_hash;
1412 clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1413 new_nbuckets * 1024);
1414 clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1415 ip4_rehash_cb, &ctx);
1418 clib_bihash_free_16_8 (&new_hash);
1423 clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1424 clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1425 sizeof (ip4_full_reass_main.hash));
1426 clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1433 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1434 u32 * max_reassembly_length,
1435 u32 * expire_walk_interval_ms)
1437 *timeout_ms = ip4_full_reass_main.timeout_ms;
1438 *max_reassemblies = ip4_full_reass_main.max_reass_n;
1439 *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1440 *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1444 static clib_error_t *
1445 ip4_full_reass_init_function (vlib_main_t * vm)
1447 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1448 clib_error_t *error = 0;
1454 vec_validate (rm->per_thread_data, vlib_num_workers ());
1455 ip4_full_reass_per_thread_t *rt;
1456 vec_foreach (rt, rm->per_thread_data)
1458 clib_spinlock_init (&rt->lock);
1459 pool_alloc (rt->pool, rm->max_reass_n);
1462 node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1464 rm->ip4_full_reass_expire_node_idx = node->index;
1466 ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1467 IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1468 IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1469 IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1471 nbuckets = ip4_full_reass_get_nbuckets ();
1472 clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1474 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1476 rm->ip4_drop_idx = node->index;
1478 rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1479 rm->fq_feature_index =
1480 vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1482 rm->feature_use_refcount_per_intf = NULL;
1486 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1487 #endif /* CLIB_MARCH_VARIANT */
1490 ip4_full_reass_walk_expired (vlib_main_t * vm,
1491 vlib_node_runtime_t * node, vlib_frame_t * f)
1493 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1494 uword event_type, *event_data = 0;
1498 vlib_process_wait_for_event_or_clock (vm,
1500 rm->expire_walk_interval_ms /
1501 (f64) MSEC_PER_SEC);
1502 event_type = vlib_process_get_events (vm, &event_data);
1506 case ~0: /* no events => timeout */
1507 /* nothing to do here */
1509 case IP4_EVENT_CONFIG_CHANGED:
1512 clib_warning ("BUG: event type 0x%wx", event_type);
1515 f64 now = vlib_time_now (vm);
1517 ip4_full_reass_t *reass;
1518 int *pool_indexes_to_free = NULL;
1520 uword thread_index = 0;
1522 const uword nthreads = vlib_num_workers () + 1;
1523 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1525 ip4_full_reass_per_thread_t *rt =
1526 &rm->per_thread_data[thread_index];
1527 clib_spinlock_lock (&rt->lock);
1529 vec_reset_length (pool_indexes_to_free);
1531 pool_foreach_index (index, rt->pool, ({
1532 reass = pool_elt_at_index (rt->pool, index);
1533 if (now > reass->last_heard + rm->timeout)
1535 vec_add1 (pool_indexes_to_free, index);
1541 vec_foreach (i, pool_indexes_to_free)
1543 ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1544 ip4_full_reass_drop_all (vm, node, rm, reass);
1545 ip4_full_reass_free (rm, rt, reass);
1549 clib_spinlock_unlock (&rt->lock);
1552 vec_free (pool_indexes_to_free);
1555 _vec_len (event_data) = 0;
1563 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1564 .function = ip4_full_reass_walk_expired,
1565 .type = VLIB_NODE_TYPE_PROCESS,
1566 .name = "ip4-full-reassembly-expire-walk",
1567 .format_trace = format_ip4_full_reass_trace,
1568 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1569 .error_strings = ip4_full_reass_error_strings,
1575 format_ip4_full_reass_key (u8 * s, va_list * args)
1577 ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1580 "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1581 key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1582 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1587 format_ip4_reass (u8 * s, va_list * args)
1589 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1590 ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1592 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1593 "last_packet_octet: %u, trace_op_counter: %u\n",
1594 reass->id, format_ip4_full_reass_key, &reass->key,
1595 reass->first_bi, reass->data_len,
1596 reass->last_packet_octet, reass->trace_op_counter);
1598 u32 bi = reass->first_bi;
1602 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1603 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1606 " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1607 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1608 vnb->ip.reass.range_last, bi,
1609 ip4_full_reass_buffer_get_data_offset (b),
1610 ip4_full_reass_buffer_get_data_len (b),
1611 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1612 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1614 bi = b->next_buffer;
1624 static clib_error_t *
1625 show_ip4_reass (vlib_main_t * vm,
1626 unformat_input_t * input,
1627 CLIB_UNUSED (vlib_cli_command_t * lmd))
1629 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1631 vlib_cli_output (vm, "---------------------");
1632 vlib_cli_output (vm, "IP4 reassembly status");
1633 vlib_cli_output (vm, "---------------------");
1634 bool details = false;
1635 if (unformat (input, "details"))
1640 u32 sum_reass_n = 0;
1641 ip4_full_reass_t *reass;
1643 const uword nthreads = vlib_num_workers () + 1;
1644 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1646 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1647 clib_spinlock_lock (&rt->lock);
1651 pool_foreach (reass, rt->pool, {
1652 vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1656 sum_reass_n += rt->reass_n;
1657 clib_spinlock_unlock (&rt->lock);
1659 vlib_cli_output (vm, "---------------------");
1660 vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1661 (long unsigned) sum_reass_n);
1662 vlib_cli_output (vm,
1663 "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1664 (long unsigned) rm->max_reass_n);
1665 vlib_cli_output (vm,
1666 "Maximum configured full IP4 reassembly timeout: %lums\n",
1667 (long unsigned) rm->timeout_ms);
1668 vlib_cli_output (vm,
1669 "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1670 (long unsigned) rm->expire_walk_interval_ms);
1675 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1676 .path = "show ip4-full-reassembly",
1677 .short_help = "show ip4-full-reassembly [details]",
1678 .function = show_ip4_reass,
1682 #ifndef CLIB_MARCH_VARIANT
1684 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1686 return vnet_feature_enable_disable ("ip4-unicast",
1687 "ip4-full-reassembly-feature",
1688 sw_if_index, enable_disable, 0, 0);
1690 #endif /* CLIB_MARCH_VARIANT */
1693 #define foreach_ip4_full_reass_handoff_error \
1694 _(CONGESTION_DROP, "congestion drop")
1699 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1700 foreach_ip4_full_reass_handoff_error
1702 IP4_FULL_REASS_HANDOFF_N_ERROR,
1703 } ip4_full_reass_handoff_error_t;
1705 static char *ip4_full_reass_handoff_error_strings[] = {
1706 #define _(sym,string) string,
1707 foreach_ip4_full_reass_handoff_error
1713 u32 next_worker_index;
1714 } ip4_full_reass_handoff_trace_t;
1717 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1719 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1720 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1721 ip4_full_reass_handoff_trace_t *t =
1722 va_arg (*args, ip4_full_reass_handoff_trace_t *);
1725 format (s, "ip4-full-reassembly-handoff: next-worker %d",
1726 t->next_worker_index);
1732 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1733 vlib_node_runtime_t * node,
1734 vlib_frame_t * frame, bool is_feature)
1736 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1738 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1739 u32 n_enq, n_left_from, *from;
1740 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1743 from = vlib_frame_vector_args (frame);
1744 n_left_from = frame->n_vectors;
1745 vlib_get_buffers (vm, from, bufs, n_left_from);
1748 ti = thread_indices;
1750 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1752 while (n_left_from > 0)
1754 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1757 ((node->flags & VLIB_NODE_FLAG_TRACE)
1758 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1760 ip4_full_reass_handoff_trace_t *t =
1761 vlib_add_trace (vm, node, b[0], sizeof (*t));
1762 t->next_worker_index = ti[0];
1770 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1771 frame->n_vectors, 1);
1773 if (n_enq < frame->n_vectors)
1774 vlib_node_increment_counter (vm, node->node_index,
1775 IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1776 frame->n_vectors - n_enq);
1777 return frame->n_vectors;
1780 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1781 vlib_node_runtime_t * node,
1782 vlib_frame_t * frame)
1784 return ip4_full_reass_handoff_node_inline (vm, node, frame,
1785 false /* is_feature */ );
1790 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1791 .name = "ip4-full-reassembly-handoff",
1792 .vector_size = sizeof (u32),
1793 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1794 .error_strings = ip4_full_reass_handoff_error_strings,
1795 .format_trace = format_ip4_full_reass_handoff_trace,
1807 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1808 vlib_node_runtime_t *
1810 vlib_frame_t * frame)
1812 return ip4_full_reass_handoff_node_inline (vm, node, frame,
1813 true /* is_feature */ );
1819 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1820 .name = "ip4-full-reass-feature-hoff",
1821 .vector_size = sizeof (u32),
1822 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1823 .error_strings = ip4_full_reass_handoff_error_strings,
1824 .format_trace = format_ip4_full_reass_handoff_trace,
1834 #ifndef CLIB_MARCH_VARIANT
1836 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1838 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1839 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1842 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1844 ++rm->feature_use_refcount_per_intf[sw_if_index];
1845 return vnet_feature_enable_disable ("ip4-unicast",
1846 "ip4-full-reassembly-feature",
1847 sw_if_index, 1, 0, 0);
1849 ++rm->feature_use_refcount_per_intf[sw_if_index];
1853 --rm->feature_use_refcount_per_intf[sw_if_index];
1854 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1855 return vnet_feature_enable_disable ("ip4-unicast",
1856 "ip4-full-reassembly-feature",
1857 sw_if_index, 0, 0, 0);
1864 * fd.io coding-style-patch-verification: ON
1867 * eval: (c-set-style "gnu")