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;
189 // reference count for enabling/disabling feature - per interface
190 u32 *feature_use_refcount_per_intf;
191 } ip4_full_reass_main_t;
193 extern ip4_full_reass_main_t ip4_full_reass_main;
195 #ifndef CLIB_MARCH_VARIANT
196 ip4_full_reass_main_t ip4_full_reass_main;
197 #endif /* CLIB_MARCH_VARIANT */
201 IP4_FULL_REASS_NEXT_INPUT,
202 IP4_FULL_REASS_NEXT_DROP,
203 IP4_FULL_REASS_NEXT_HANDOFF,
204 IP4_FULL_REASS_N_NEXT,
205 } ip4_full_reass_next_t;
212 } ip4_full_reass_node_type_t;
222 } ip4_full_reass_trace_operation_e;
232 } ip4_full_reass_range_trace_t;
236 ip4_full_reass_trace_operation_e action;
238 ip4_full_reass_range_trace_t trace_range;
246 bool is_after_handoff;
247 ip4_header_t ip4_header;
248 } ip4_full_reass_trace_t;
250 extern vlib_node_registration_t ip4_full_reass_node;
251 extern vlib_node_registration_t ip4_full_reass_node_feature;
252 extern vlib_node_registration_t ip4_full_reass_node_custom;
255 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
256 ip4_full_reass_range_trace_t * trace)
258 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
259 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
260 trace->range_first = vnb->ip.reass.range_first;
261 trace->range_last = vnb->ip.reass.range_last;
262 trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
263 trace->data_len = ip4_full_reass_buffer_get_data_len (b);
264 trace->range_bi = bi;
268 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
270 ip4_full_reass_range_trace_t *trace =
271 va_arg (*args, ip4_full_reass_range_trace_t *);
273 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
274 trace->range_last, trace->data_offset, trace->data_len,
280 format_ip4_full_reass_trace (u8 * s, va_list * args)
282 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
283 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
284 ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
286 if (~0 != t->reass_id)
288 if (t->is_after_handoff)
291 format (s, "%U\n", format_ip4_header, &t->ip4_header,
292 sizeof (t->ip4_header));
296 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
297 t->reass_id, t->op_id);
298 indent = format_get_indent (s);
301 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
302 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
308 s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
309 format_ip4_full_reass_range_trace, &t->trace_range,
313 s = format (s, "\n%Udiscard %U", format_white_space, indent,
314 format_ip4_full_reass_range_trace, &t->trace_range);
317 s = format (s, "\n%Unew %U", format_white_space, indent,
318 format_ip4_full_reass_range_trace, &t->trace_range);
321 s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
322 format_ip4_full_reass_range_trace, &t->trace_range);
325 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
329 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
337 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
338 ip4_full_reass_main_t * rm,
339 ip4_full_reass_t * reass, u32 bi,
340 ip4_full_reass_trace_operation_e action,
341 u32 size_diff, u32 thread_id_to)
343 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
344 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
345 bool is_after_handoff = false;
346 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
348 is_after_handoff = true;
350 ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
351 t->is_after_handoff = is_after_handoff;
352 if (t->is_after_handoff)
354 clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
355 clib_min (sizeof (t->ip4_header), b->current_length));
359 t->reass_id = reass->id;
360 t->op_id = reass->trace_op_counter;
361 t->trace_range.first_bi = reass->first_bi;
362 t->total_data_len = reass->data_len;
363 ++reass->trace_op_counter;
369 t->trace_range.first_bi = 0;
370 t->total_data_len = 0;
373 ip4_full_reass_trace_details (vm, bi, &t->trace_range);
374 t->size_diff = size_diff;
375 t->thread_id = vm->thread_index;
376 t->thread_id_to = thread_id_to;
377 t->fragment_first = vnb->ip.reass.fragment_first;
378 t->fragment_last = vnb->ip.reass.fragment_last;
381 s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
382 printf ("%.*s\n", vec_len (s), s);
384 vec_reset_length (s);
389 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
390 ip4_full_reass_t * reass)
392 pool_put (rt->pool, reass);
397 ip4_full_reass_free (ip4_full_reass_main_t * rm,
398 ip4_full_reass_per_thread_t * rt,
399 ip4_full_reass_t * reass)
401 clib_bihash_kv_16_8_t kv;
402 kv.key[0] = reass->key.as_u64[0];
403 kv.key[1] = reass->key.as_u64[1];
404 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
405 return ip4_full_reass_free_ctx (rt, reass);
409 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
410 ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
412 u32 range_bi = reass->first_bi;
413 vlib_buffer_t *range_b;
414 vnet_buffer_opaque_t *range_vnb;
416 while (~0 != range_bi)
418 range_b = vlib_get_buffer (vm, range_bi);
419 range_vnb = vnet_buffer (range_b);
423 vec_add1 (to_free, bi);
424 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
425 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
428 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
435 range_bi = range_vnb->ip.reass.next_range_bi;
437 /* send to next_error_index */
438 if (~0 != reass->error_next_index)
440 u32 n_left_to_next, *to_next, next_index;
442 next_index = reass->error_next_index;
445 while (vec_len (to_free) > 0)
447 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
449 while (vec_len (to_free) > 0 && n_left_to_next > 0)
451 bi = vec_pop (to_free);
460 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
465 vlib_buffer_free (vm, to_free, vec_len (to_free));
471 ip4_full_reass_init (ip4_full_reass_t * reass)
473 reass->first_bi = ~0;
474 reass->last_packet_octet = ~0;
476 reass->next_index = ~0;
477 reass->error_next_index = ~0;
480 always_inline ip4_full_reass_t *
481 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
482 ip4_full_reass_main_t * rm,
483 ip4_full_reass_per_thread_t * rt,
484 ip4_full_reass_kv_t * kv, u8 * do_handoff)
486 ip4_full_reass_t *reass;
492 now = vlib_time_now (vm);
493 if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
495 if (vm->thread_index != kv->v.memory_owner_thread_index)
501 pool_elt_at_index (rm->per_thread_data
502 [kv->v.memory_owner_thread_index].pool,
505 if (now > reass->last_heard + rm->timeout)
507 ip4_full_reass_drop_all (vm, node, rm, reass);
508 ip4_full_reass_free (rm, rt, reass);
515 reass->last_heard = now;
519 if (rt->reass_n >= rm->max_reass_n)
526 pool_get (rt->pool, reass);
527 clib_memset (reass, 0, sizeof (*reass));
528 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
529 reass->memory_owner_thread_index = vm->thread_index;
531 ip4_full_reass_init (reass);
535 reass->key.as_u64[0] = kv->kv.key[0];
536 reass->key.as_u64[1] = kv->kv.key[1];
537 kv->v.reass_index = (reass - rt->pool);
538 kv->v.memory_owner_thread_index = vm->thread_index;
539 reass->last_heard = now;
541 int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
544 ip4_full_reass_free_ctx (rt, reass);
546 // if other worker created a context already work with the other copy
554 always_inline ip4_full_reass_rc_t
555 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
556 ip4_full_reass_main_t * rm,
557 ip4_full_reass_per_thread_t * rt,
558 ip4_full_reass_t * reass, u32 * bi0,
559 u32 * next0, u32 * error0, bool is_custom)
561 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
562 vlib_buffer_t *last_b = NULL;
563 u32 sub_chain_bi = reass->first_bi;
564 u32 total_length = 0;
568 u32 tmp_bi = sub_chain_bi;
569 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
570 ip4_header_t *ip = vlib_buffer_get_current (tmp);
571 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
572 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
573 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
575 return IP4_REASS_RC_INTERNAL_ERROR;
578 u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
580 ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
582 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
583 if (tmp_bi == reass->first_bi)
585 /* first buffer - keep ip4 header */
586 if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
588 return IP4_REASS_RC_INTERNAL_ERROR;
591 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
592 ip4_header_bytes (ip);
593 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
595 return IP4_REASS_RC_INTERNAL_ERROR;
599 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
605 if (trim_front > tmp->current_length)
607 /* drop whole buffer */
608 u32 to_be_freed_bi = tmp_bi;
609 trim_front -= tmp->current_length;
610 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
612 return IP4_REASS_RC_INTERNAL_ERROR;
614 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
615 tmp_bi = tmp->next_buffer;
616 tmp->next_buffer = 0;
617 tmp = vlib_get_buffer (vm, tmp_bi);
618 vlib_buffer_free_one (vm, to_be_freed_bi);
623 vlib_buffer_advance (tmp, trim_front);
631 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
632 last_b->next_buffer = tmp_bi;
635 if (keep_data <= tmp->current_length)
637 tmp->current_length = keep_data;
642 keep_data -= tmp->current_length;
643 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
645 return IP4_REASS_RC_INTERNAL_ERROR;
648 total_length += tmp->current_length;
649 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
651 tmp_bi = tmp->next_buffer;
652 tmp = vlib_get_buffer (vm, tmp->next_buffer);
661 u32 to_be_freed_bi = tmp_bi;
662 if (reass->first_bi == tmp_bi)
664 return IP4_REASS_RC_INTERNAL_ERROR;
666 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
668 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
669 tmp_bi = tmp->next_buffer;
670 tmp->next_buffer = 0;
671 tmp = vlib_get_buffer (vm, tmp_bi);
672 vlib_buffer_free_one (vm, to_be_freed_bi);
676 tmp->next_buffer = 0;
677 vlib_buffer_free_one (vm, to_be_freed_bi);
683 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
686 while (~0 != sub_chain_bi);
690 return IP4_REASS_RC_INTERNAL_ERROR;
692 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
694 if (total_length < first_b->current_length)
696 return IP4_REASS_RC_INTERNAL_ERROR;
698 total_length -= first_b->current_length;
699 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
700 first_b->total_length_not_including_first_buffer = total_length;
701 ip4_header_t *ip = vlib_buffer_get_current (first_b);
702 ip->flags_and_fragment_offset = 0;
703 ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
704 ip->checksum = ip4_header_checksum (ip);
705 if (!vlib_buffer_chain_linearize (vm, first_b))
707 return IP4_REASS_RC_NO_BUF;
709 // reset to reconstruct the mbuf linking
710 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
711 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
713 ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
716 // following code does a hexdump of packet fragments to stdout ...
719 u32 bi = reass->first_bi;
723 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
724 s = format (s, "%u: %U\n", bi, format_hexdump,
725 vlib_buffer_get_current (b), b->current_length);
726 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
735 printf ("%.*s\n", vec_len (s), s);
742 *bi0 = reass->first_bi;
745 *next0 = IP4_FULL_REASS_NEXT_INPUT;
749 *next0 = reass->next_index;
751 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
752 *error0 = IP4_ERROR_NONE;
753 ip4_full_reass_free (rm, rt, reass);
755 return IP4_REASS_RC_OK;
758 always_inline ip4_full_reass_rc_t
759 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
760 ip4_full_reass_main_t * rm,
761 ip4_full_reass_per_thread_t * rt,
762 ip4_full_reass_t * reass,
763 u32 prev_range_bi, u32 new_next_bi)
765 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
766 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
767 if (~0 != prev_range_bi)
769 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
770 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
771 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
772 prev_vnb->ip.reass.next_range_bi = new_next_bi;
776 if (~0 != reass->first_bi)
778 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
780 reass->first_bi = new_next_bi;
782 vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
783 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
784 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
786 return IP4_REASS_RC_INTERNAL_ERROR;
788 reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
789 return IP4_REASS_RC_OK;
792 always_inline ip4_full_reass_rc_t
793 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
794 vlib_node_runtime_t * node,
795 ip4_full_reass_main_t * rm,
796 ip4_full_reass_t * reass,
797 u32 prev_range_bi, u32 discard_bi)
799 vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
800 vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
801 if (~0 != prev_range_bi)
803 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
804 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
805 if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
807 return IP4_REASS_RC_INTERNAL_ERROR;
809 prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
813 reass->first_bi = discard_vnb->ip.reass.next_range_bi;
815 vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
816 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
817 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
819 return IP4_REASS_RC_INTERNAL_ERROR;
821 reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
824 u32 to_be_freed_bi = discard_bi;
825 if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
827 ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
828 RANGE_DISCARD, 0, ~0);
830 if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
832 discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
833 discard_bi = discard_b->next_buffer;
834 discard_b->next_buffer = 0;
835 discard_b = vlib_get_buffer (vm, discard_bi);
836 vlib_buffer_free_one (vm, to_be_freed_bi);
840 discard_b->next_buffer = 0;
841 vlib_buffer_free_one (vm, to_be_freed_bi);
845 return IP4_REASS_RC_OK;
848 always_inline ip4_full_reass_rc_t
849 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
850 ip4_full_reass_main_t * rm,
851 ip4_full_reass_per_thread_t * rt,
852 ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
853 u32 * error0, bool is_custom, u32 * handoff_thread_idx)
855 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
856 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
859 // store (error_)next_index before it's overwritten
860 reass->next_index = fvnb->ip.reass.next_index;
861 reass->error_next_index = fvnb->ip.reass.error_next_index;
863 ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
865 ip4_header_t *fip = vlib_buffer_get_current (fb);
866 const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
867 const u32 fragment_length =
868 clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
869 const u32 fragment_last = fragment_first + fragment_length - 1;
870 fvnb->ip.reass.fragment_first = fragment_first;
871 fvnb->ip.reass.fragment_last = fragment_last;
872 int more_fragments = ip4_get_fragment_more (fip);
873 u32 candidate_range_bi = reass->first_bi;
874 u32 prev_range_bi = ~0;
875 fvnb->ip.reass.range_first = fragment_first;
876 fvnb->ip.reass.range_last = fragment_last;
877 fvnb->ip.reass.next_range_bi = ~0;
880 reass->last_packet_octet = fragment_last;
882 if (~0 == reass->first_bi)
884 // starting a new reassembly
886 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
887 prev_range_bi, *bi0);
888 if (IP4_REASS_RC_OK != rc)
892 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
894 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
898 reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
899 reass->fragments_n = 1;
900 return IP4_REASS_RC_OK;
902 reass->min_fragment_length =
903 clib_min (clib_net_to_host_u16 (fip->length),
904 fvnb->ip.reass.estimated_mtu);
905 while (~0 != candidate_range_bi)
907 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
908 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
909 if (fragment_first > candidate_vnb->ip.reass.range_last)
911 // this fragments starts after candidate range
912 prev_range_bi = candidate_range_bi;
913 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
914 if (candidate_vnb->ip.reass.range_last < fragment_last &&
915 ~0 == candidate_range_bi)
917 // special case - this fragment falls beyond all known ranges
919 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
920 prev_range_bi, *bi0);
921 if (IP4_REASS_RC_OK != rc)
930 if (fragment_last < candidate_vnb->ip.reass.range_first)
932 // this fragment ends before candidate range without any overlap
934 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
935 prev_range_bi, *bi0);
936 if (IP4_REASS_RC_OK != rc)
944 if (fragment_first >= candidate_vnb->ip.reass.range_first &&
945 fragment_last <= candidate_vnb->ip.reass.range_last)
947 // this fragment is a (sub)part of existing range, ignore it
948 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
950 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
951 RANGE_OVERLAP, 0, ~0);
955 int discard_candidate = 0;
956 if (fragment_first < candidate_vnb->ip.reass.range_first)
959 fragment_last - candidate_vnb->ip.reass.range_first + 1;
960 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
962 candidate_vnb->ip.reass.range_first += overlap;
963 if (reass->data_len < overlap)
965 return IP4_REASS_RC_INTERNAL_ERROR;
967 reass->data_len -= overlap;
968 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
970 ip4_full_reass_add_trace (vm, node, rm, reass,
972 RANGE_SHRINK, 0, ~0);
975 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
978 if (IP4_REASS_RC_OK != rc)
986 discard_candidate = 1;
989 else if (fragment_last > candidate_vnb->ip.reass.range_last)
992 candidate_vnb->ip.reass.range_last - fragment_first + 1;
993 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
995 fvnb->ip.reass.range_first += overlap;
996 if (~0 != candidate_vnb->ip.reass.next_range_bi)
998 prev_range_bi = candidate_range_bi;
1000 candidate_vnb->ip.reass.next_range_bi;
1005 // special case - last range discarded
1007 ip4_full_reass_insert_range_in_chain (vm, rm, rt,
1011 if (IP4_REASS_RC_OK != rc)
1020 discard_candidate = 1;
1025 discard_candidate = 1;
1027 if (discard_candidate)
1029 u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1030 // discard candidate range, probe next range
1032 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1034 candidate_range_bi);
1035 if (IP4_REASS_RC_OK != rc)
1039 if (~0 != next_range_bi)
1041 candidate_range_bi = next_range_bi;
1046 // special case - last range discarded
1048 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1051 if (IP4_REASS_RC_OK != rc)
1061 ++reass->fragments_n;
1064 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1066 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1070 if (~0 != reass->last_packet_octet &&
1071 reass->data_len == reass->last_packet_octet + 1)
1073 *handoff_thread_idx = reass->sendout_thread_index;
1075 reass->memory_owner_thread_index != reass->sendout_thread_index;
1077 ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1079 if (IP4_REASS_RC_OK == rc && handoff)
1081 rc = IP4_REASS_RC_HANDOFF;
1089 if (reass->fragments_n > rm->max_reass_len)
1091 rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1096 *next0 = IP4_FULL_REASS_NEXT_DROP;
1097 *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1104 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1105 vlib_frame_t * frame, ip4_full_reass_node_type_t type)
1107 u32 *from = vlib_frame_vector_args (frame);
1108 u32 n_left_from, n_left_to_next, *to_next, next_index;
1109 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1110 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1111 clib_spinlock_lock (&rt->lock);
1113 n_left_from = frame->n_vectors;
1114 next_index = node->cached_next_index;
1115 while (n_left_from > 0)
1117 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1119 while (n_left_from > 0 && n_left_to_next > 0)
1124 u32 error0 = IP4_ERROR_NONE;
1127 b0 = vlib_get_buffer (vm, bi0);
1129 ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1130 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1132 // this is a whole packet - no fragmentation
1135 next0 = IP4_FULL_REASS_NEXT_INPUT;
1139 next0 = vnet_buffer (b0)->ip.reass.next_index;
1141 goto packet_enqueue;
1143 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1144 const u32 fragment_length =
1145 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1146 const u32 fragment_last = fragment_first + fragment_length - 1;
1147 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
1149 next0 = IP4_FULL_REASS_NEXT_DROP;
1150 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1151 goto packet_enqueue;
1153 ip4_full_reass_kv_t kv;
1157 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1158 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1159 (u64) ip0->src_address.as_u32 << 32;
1161 (u64) ip0->dst_address.
1162 as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1164 ip4_full_reass_t *reass =
1165 ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1170 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1171 if (0 == fragment_first)
1173 reass->sendout_thread_index = vm->thread_index;
1177 if (PREDICT_FALSE (do_handoff))
1179 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1180 vnet_buffer (b0)->ip.reass.owner_thread_index =
1181 kv.v.memory_owner_thread_index;
1185 u32 handoff_thread_idx;
1186 switch (ip4_full_reass_update
1187 (vm, node, rm, rt, reass, &bi0, &next0,
1188 &error0, CUSTOM == type, &handoff_thread_idx))
1190 case IP4_REASS_RC_OK:
1191 /* nothing to do here */
1193 case IP4_REASS_RC_HANDOFF:
1194 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1195 b0 = vlib_get_buffer (vm, bi0);
1196 vnet_buffer (b0)->ip.reass.owner_thread_index =
1199 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1200 vlib_node_increment_counter (vm, node->node_index,
1201 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1203 ip4_full_reass_drop_all (vm, node, rm, reass);
1204 ip4_full_reass_free (rm, rt, reass);
1207 case IP4_REASS_RC_NO_BUF:
1208 vlib_node_increment_counter (vm, node->node_index,
1209 IP4_ERROR_REASS_NO_BUF, 1);
1210 ip4_full_reass_drop_all (vm, node, rm, reass);
1211 ip4_full_reass_free (rm, rt, reass);
1214 case IP4_REASS_RC_INTERNAL_ERROR:
1215 /* drop everything and start with a clean slate */
1216 vlib_node_increment_counter (vm, node->node_index,
1217 IP4_ERROR_REASS_INTERNAL_ERROR,
1219 ip4_full_reass_drop_all (vm, node, rm, reass);
1220 ip4_full_reass_free (rm, rt, reass);
1227 next0 = IP4_FULL_REASS_NEXT_DROP;
1228 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1238 n_left_to_next -= 1;
1240 /* bi0 might have been updated by reass_finalize, reload */
1241 b0 = vlib_get_buffer (vm, bi0);
1242 if (IP4_ERROR_NONE != error0)
1244 b0->error = node->errors[error0];
1247 if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1249 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1251 ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1253 vnet_buffer (b0)->ip.
1254 reass.owner_thread_index);
1257 else if (FEATURE == type && IP4_ERROR_NONE == error0)
1259 vnet_feature_next (&next0, b0);
1261 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1262 to_next, n_left_to_next,
1264 IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1272 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1275 clib_spinlock_unlock (&rt->lock);
1276 return frame->n_vectors;
1279 static char *ip4_full_reass_error_strings[] = {
1280 #define _(sym, string) string,
1285 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1286 vlib_node_runtime_t * node,
1287 vlib_frame_t * frame)
1289 return ip4_full_reass_inline (vm, node, frame, NORMAL);
1293 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1294 .name = "ip4-full-reassembly",
1295 .vector_size = sizeof (u32),
1296 .format_trace = format_ip4_full_reass_trace,
1297 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1298 .error_strings = ip4_full_reass_error_strings,
1299 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1302 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1303 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1304 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1310 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1311 vlib_node_runtime_t * node,
1312 vlib_frame_t * frame)
1314 return ip4_full_reass_inline (vm, node, frame, FEATURE);
1318 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1319 .name = "ip4-full-reassembly-feature",
1320 .vector_size = sizeof (u32),
1321 .format_trace = format_ip4_full_reass_trace,
1322 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1323 .error_strings = ip4_full_reass_error_strings,
1324 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1327 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1328 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1329 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1335 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1336 .arc_name = "ip4-unicast",
1337 .node_name = "ip4-full-reassembly-feature",
1338 .runs_before = VNET_FEATURES ("ip4-lookup",
1339 "ipsec4-input-feature"),
1344 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1345 vlib_node_runtime_t * node,
1346 vlib_frame_t * frame)
1348 return ip4_full_reass_inline (vm, node, frame, CUSTOM);
1352 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1353 .name = "ip4-full-reassembly-custom",
1354 .vector_size = sizeof (u32),
1355 .format_trace = format_ip4_full_reass_trace,
1356 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1357 .error_strings = ip4_full_reass_error_strings,
1358 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1361 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1362 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1363 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1369 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1370 .arc_name = "ip4-unicast",
1371 .node_name = "ip4-full-reassembly-feature",
1372 .runs_before = VNET_FEATURES ("ip4-lookup",
1373 "ipsec4-input-feature"),
1379 #ifndef CLIB_MARCH_VARIANT
1381 ip4_full_reass_custom_register_next_node (uword node_index)
1383 return vlib_node_add_next (vlib_get_main (),
1384 ip4_full_reass_node_custom.index, node_index);
1388 ip4_full_reass_get_nbuckets ()
1390 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1394 nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1396 for (i = 0; i < 31; i++)
1397 if ((1 << i) >= nbuckets)
1403 #endif /* CLIB_MARCH_VARIANT */
1407 IP4_EVENT_CONFIG_CHANGED = 1,
1408 } ip4_full_reass_event_t;
1413 clib_bihash_16_8_t *new_hash;
1414 } ip4_rehash_cb_ctx;
1416 #ifndef CLIB_MARCH_VARIANT
1418 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1420 ip4_rehash_cb_ctx *ctx = _ctx;
1421 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1425 return (BIHASH_WALK_CONTINUE);
1429 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1430 u32 max_reassembly_length,
1431 u32 expire_walk_interval_ms)
1433 ip4_full_reass_main.timeout_ms = timeout_ms;
1434 ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1435 ip4_full_reass_main.max_reass_n = max_reassemblies;
1436 ip4_full_reass_main.max_reass_len = max_reassembly_length;
1437 ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1441 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1442 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1444 u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1445 ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1446 max_reassembly_length, expire_walk_interval_ms);
1447 vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1448 ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1449 IP4_EVENT_CONFIG_CHANGED, 0);
1450 u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1451 if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1453 clib_bihash_16_8_t new_hash;
1454 clib_memset (&new_hash, 0, sizeof (new_hash));
1455 ip4_rehash_cb_ctx ctx;
1457 ctx.new_hash = &new_hash;
1458 clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1459 new_nbuckets * 1024);
1460 clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1461 ip4_rehash_cb, &ctx);
1464 clib_bihash_free_16_8 (&new_hash);
1469 clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1470 clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1471 sizeof (ip4_full_reass_main.hash));
1472 clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1479 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1480 u32 * max_reassembly_length,
1481 u32 * expire_walk_interval_ms)
1483 *timeout_ms = ip4_full_reass_main.timeout_ms;
1484 *max_reassemblies = ip4_full_reass_main.max_reass_n;
1485 *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1486 *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1490 static clib_error_t *
1491 ip4_full_reass_init_function (vlib_main_t * vm)
1493 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1494 clib_error_t *error = 0;
1500 vec_validate (rm->per_thread_data, vlib_num_workers ());
1501 ip4_full_reass_per_thread_t *rt;
1502 vec_foreach (rt, rm->per_thread_data)
1504 clib_spinlock_init (&rt->lock);
1505 pool_alloc (rt->pool, rm->max_reass_n);
1508 node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1510 rm->ip4_full_reass_expire_node_idx = node->index;
1512 ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1513 IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1514 IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1515 IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1517 nbuckets = ip4_full_reass_get_nbuckets ();
1518 clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1520 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1522 rm->ip4_drop_idx = node->index;
1524 rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1525 rm->fq_feature_index =
1526 vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1527 rm->fq_custom_index =
1528 vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1530 rm->feature_use_refcount_per_intf = NULL;
1534 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1535 #endif /* CLIB_MARCH_VARIANT */
1538 ip4_full_reass_walk_expired (vlib_main_t * vm,
1539 vlib_node_runtime_t * node, vlib_frame_t * f)
1541 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1542 uword event_type, *event_data = 0;
1546 vlib_process_wait_for_event_or_clock (vm,
1548 rm->expire_walk_interval_ms /
1549 (f64) MSEC_PER_SEC);
1550 event_type = vlib_process_get_events (vm, &event_data);
1554 case ~0: /* no events => timeout */
1555 /* nothing to do here */
1557 case IP4_EVENT_CONFIG_CHANGED:
1560 clib_warning ("BUG: event type 0x%wx", event_type);
1563 f64 now = vlib_time_now (vm);
1565 ip4_full_reass_t *reass;
1566 int *pool_indexes_to_free = NULL;
1568 uword thread_index = 0;
1570 const uword nthreads = vlib_num_workers () + 1;
1571 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1573 ip4_full_reass_per_thread_t *rt =
1574 &rm->per_thread_data[thread_index];
1575 clib_spinlock_lock (&rt->lock);
1577 vec_reset_length (pool_indexes_to_free);
1579 pool_foreach_index (index, rt->pool) {
1580 reass = pool_elt_at_index (rt->pool, index);
1581 if (now > reass->last_heard + rm->timeout)
1583 vec_add1 (pool_indexes_to_free, index);
1589 vec_foreach (i, pool_indexes_to_free)
1591 ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1592 ip4_full_reass_drop_all (vm, node, rm, reass);
1593 ip4_full_reass_free (rm, rt, reass);
1597 clib_spinlock_unlock (&rt->lock);
1600 vec_free (pool_indexes_to_free);
1603 _vec_len (event_data) = 0;
1611 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1612 .function = ip4_full_reass_walk_expired,
1613 .type = VLIB_NODE_TYPE_PROCESS,
1614 .name = "ip4-full-reassembly-expire-walk",
1615 .format_trace = format_ip4_full_reass_trace,
1616 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1617 .error_strings = ip4_full_reass_error_strings,
1623 format_ip4_full_reass_key (u8 * s, va_list * args)
1625 ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1628 "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1629 key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1630 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1635 format_ip4_reass (u8 * s, va_list * args)
1637 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1638 ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1640 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1641 "last_packet_octet: %u, trace_op_counter: %u\n",
1642 reass->id, format_ip4_full_reass_key, &reass->key,
1643 reass->first_bi, reass->data_len,
1644 reass->last_packet_octet, reass->trace_op_counter);
1646 u32 bi = reass->first_bi;
1650 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1651 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1654 " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1655 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1656 vnb->ip.reass.range_last, bi,
1657 ip4_full_reass_buffer_get_data_offset (b),
1658 ip4_full_reass_buffer_get_data_len (b),
1659 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1660 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1662 bi = b->next_buffer;
1672 static clib_error_t *
1673 show_ip4_reass (vlib_main_t * vm,
1674 unformat_input_t * input,
1675 CLIB_UNUSED (vlib_cli_command_t * lmd))
1677 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1679 vlib_cli_output (vm, "---------------------");
1680 vlib_cli_output (vm, "IP4 reassembly status");
1681 vlib_cli_output (vm, "---------------------");
1682 bool details = false;
1683 if (unformat (input, "details"))
1688 u32 sum_reass_n = 0;
1689 ip4_full_reass_t *reass;
1691 const uword nthreads = vlib_num_workers () + 1;
1692 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1694 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1695 clib_spinlock_lock (&rt->lock);
1699 pool_foreach (reass, rt->pool) {
1700 vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1704 sum_reass_n += rt->reass_n;
1705 clib_spinlock_unlock (&rt->lock);
1707 vlib_cli_output (vm, "---------------------");
1708 vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1709 (long unsigned) sum_reass_n);
1710 vlib_cli_output (vm,
1711 "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1712 (long unsigned) rm->max_reass_n);
1713 vlib_cli_output (vm,
1714 "Maximum configured full IP4 reassembly timeout: %lums\n",
1715 (long unsigned) rm->timeout_ms);
1716 vlib_cli_output (vm,
1717 "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1718 (long unsigned) rm->expire_walk_interval_ms);
1723 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1724 .path = "show ip4-full-reassembly",
1725 .short_help = "show ip4-full-reassembly [details]",
1726 .function = show_ip4_reass,
1730 #ifndef CLIB_MARCH_VARIANT
1732 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1734 return vnet_feature_enable_disable ("ip4-unicast",
1735 "ip4-full-reassembly-feature",
1736 sw_if_index, enable_disable, 0, 0);
1738 #endif /* CLIB_MARCH_VARIANT */
1741 #define foreach_ip4_full_reass_handoff_error \
1742 _(CONGESTION_DROP, "congestion drop")
1747 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1748 foreach_ip4_full_reass_handoff_error
1750 IP4_FULL_REASS_HANDOFF_N_ERROR,
1751 } ip4_full_reass_handoff_error_t;
1753 static char *ip4_full_reass_handoff_error_strings[] = {
1754 #define _(sym,string) string,
1755 foreach_ip4_full_reass_handoff_error
1761 u32 next_worker_index;
1762 } ip4_full_reass_handoff_trace_t;
1765 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1767 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1768 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1769 ip4_full_reass_handoff_trace_t *t =
1770 va_arg (*args, ip4_full_reass_handoff_trace_t *);
1773 format (s, "ip4-full-reassembly-handoff: next-worker %d",
1774 t->next_worker_index);
1780 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1781 vlib_node_runtime_t * node,
1782 vlib_frame_t * frame,
1783 ip4_full_reass_node_type_t type)
1785 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1787 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1788 u32 n_enq, n_left_from, *from;
1789 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1792 from = vlib_frame_vector_args (frame);
1793 n_left_from = frame->n_vectors;
1794 vlib_get_buffers (vm, from, bufs, n_left_from);
1797 ti = thread_indices;
1802 fq_index = rm->fq_index;
1805 fq_index = rm->fq_feature_index;
1808 fq_index = rm->fq_custom_index;
1811 clib_warning ("Unexpected `type' (%d)!", type);
1815 while (n_left_from > 0)
1817 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1820 ((node->flags & VLIB_NODE_FLAG_TRACE)
1821 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1823 ip4_full_reass_handoff_trace_t *t =
1824 vlib_add_trace (vm, node, b[0], sizeof (*t));
1825 t->next_worker_index = ti[0];
1833 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1834 frame->n_vectors, 1);
1836 if (n_enq < frame->n_vectors)
1837 vlib_node_increment_counter (vm, node->node_index,
1838 IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1839 frame->n_vectors - n_enq);
1840 return frame->n_vectors;
1843 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1844 vlib_node_runtime_t * node,
1845 vlib_frame_t * frame)
1847 return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
1852 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1853 .name = "ip4-full-reassembly-handoff",
1854 .vector_size = sizeof (u32),
1855 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1856 .error_strings = ip4_full_reass_handoff_error_strings,
1857 .format_trace = format_ip4_full_reass_handoff_trace,
1869 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1870 vlib_node_runtime_t *
1872 vlib_frame_t * frame)
1874 return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
1880 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1881 .name = "ip4-full-reass-feature-hoff",
1882 .vector_size = sizeof (u32),
1883 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1884 .error_strings = ip4_full_reass_handoff_error_strings,
1885 .format_trace = format_ip4_full_reass_handoff_trace,
1896 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1897 vlib_node_runtime_t *
1899 vlib_frame_t * frame)
1901 return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
1907 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1908 .name = "ip4-full-reass-custom-hoff",
1909 .vector_size = sizeof (u32),
1910 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1911 .error_strings = ip4_full_reass_handoff_error_strings,
1912 .format_trace = format_ip4_full_reass_handoff_trace,
1922 #ifndef CLIB_MARCH_VARIANT
1924 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1926 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1927 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1930 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1932 ++rm->feature_use_refcount_per_intf[sw_if_index];
1933 return vnet_feature_enable_disable ("ip4-unicast",
1934 "ip4-full-reassembly-feature",
1935 sw_if_index, 1, 0, 0);
1937 ++rm->feature_use_refcount_per_intf[sw_if_index];
1941 --rm->feature_use_refcount_per_intf[sw_if_index];
1942 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1943 return vnet_feature_enable_disable ("ip4-unicast",
1944 "ip4-full-reassembly-feature",
1945 sw_if_index, 0, 0, 0);
1952 * fd.io coding-style-patch-verification: ON
1955 * eval: (c-set-style "gnu")