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 } ip4_full_reass_main_t;
190 extern ip4_full_reass_main_t ip4_full_reass_main;
192 #ifndef CLIB_MARCH_VARIANT
193 ip4_full_reass_main_t ip4_full_reass_main;
194 #endif /* CLIB_MARCH_VARIANT */
198 IP4_FULL_REASS_NEXT_INPUT,
199 IP4_FULL_REASS_NEXT_DROP,
200 IP4_FULL_REASS_NEXT_HANDOFF,
201 IP4_FULL_REASS_N_NEXT,
202 } ip4_full_reass_next_t;
212 } ip4_full_reass_trace_operation_e;
222 } ip4_full_reass_range_trace_t;
226 ip4_full_reass_trace_operation_e action;
228 ip4_full_reass_range_trace_t trace_range;
236 } ip4_full_reass_trace_t;
238 extern vlib_node_registration_t ip4_full_reass_node;
239 extern vlib_node_registration_t ip4_full_reass_node_feature;
242 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
243 ip4_full_reass_range_trace_t * trace)
245 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
246 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
247 trace->range_first = vnb->ip.reass.range_first;
248 trace->range_last = vnb->ip.reass.range_last;
249 trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
250 trace->data_len = ip4_full_reass_buffer_get_data_len (b);
251 trace->range_bi = bi;
255 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
257 ip4_full_reass_range_trace_t *trace =
258 va_arg (*args, ip4_full_reass_range_trace_t *);
260 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
261 trace->range_last, trace->data_offset, trace->data_len,
267 format_ip4_full_reass_trace (u8 * s, va_list * args)
269 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
270 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
271 ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
273 if (~0 != t->reass_id)
275 s = format (s, "reass id: %u, op id: %u, ", t->reass_id, t->op_id);
276 indent = format_get_indent (s);
279 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
280 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
286 s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
287 format_ip4_full_reass_range_trace, &t->trace_range,
291 s = format (s, "\n%Udiscard %U", format_white_space, indent,
292 format_ip4_full_reass_range_trace, &t->trace_range);
295 s = format (s, "\n%Unew %U", format_white_space, indent,
296 format_ip4_full_reass_range_trace, &t->trace_range);
299 s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
300 format_ip4_full_reass_range_trace, &t->trace_range);
303 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
307 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
315 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
316 ip4_full_reass_main_t * rm,
317 ip4_full_reass_t * reass, u32 bi,
318 ip4_full_reass_trace_operation_e action,
319 u32 size_diff, u32 thread_id_to)
321 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
322 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
323 ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
326 t->reass_id = reass->id;
327 t->op_id = reass->trace_op_counter;
328 t->trace_range.first_bi = reass->first_bi;
329 t->total_data_len = reass->data_len;
330 ++reass->trace_op_counter;
336 t->trace_range.first_bi = 0;
337 t->total_data_len = 0;
340 ip4_full_reass_trace_details (vm, bi, &t->trace_range);
341 t->size_diff = size_diff;
342 t->thread_id = vm->thread_index;
343 t->thread_id_to = thread_id_to;
344 t->fragment_first = vnb->ip.reass.fragment_first;
345 t->fragment_last = vnb->ip.reass.fragment_last;
348 s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
349 printf ("%.*s\n", vec_len (s), s);
351 vec_reset_length (s);
356 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
357 ip4_full_reass_t * reass)
359 pool_put (rt->pool, reass);
364 ip4_full_reass_free (ip4_full_reass_main_t * rm,
365 ip4_full_reass_per_thread_t * rt,
366 ip4_full_reass_t * reass)
368 clib_bihash_kv_16_8_t kv;
369 kv.key[0] = reass->key.as_u64[0];
370 kv.key[1] = reass->key.as_u64[1];
371 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
372 return ip4_full_reass_free_ctx (rt, reass);
376 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
377 ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
379 u32 range_bi = reass->first_bi;
380 vlib_buffer_t *range_b;
381 vnet_buffer_opaque_t *range_vnb;
383 while (~0 != range_bi)
385 range_b = vlib_get_buffer (vm, range_bi);
386 range_vnb = vnet_buffer (range_b);
390 vec_add1 (to_free, bi);
391 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
392 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
395 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
402 range_bi = range_vnb->ip.reass.next_range_bi;
404 /* send to next_error_index */
405 if (~0 != reass->error_next_index)
407 u32 n_left_to_next, *to_next, next_index;
409 next_index = reass->error_next_index;
412 while (vec_len (to_free) > 0)
414 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
416 while (vec_len (to_free) > 0 && n_left_to_next > 0)
418 bi = vec_pop (to_free);
427 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
432 vlib_buffer_free (vm, to_free, vec_len (to_free));
437 ip4_full_reass_init (ip4_full_reass_t * reass)
439 reass->first_bi = ~0;
440 reass->last_packet_octet = ~0;
442 reass->next_index = ~0;
443 reass->error_next_index = ~0;
446 always_inline ip4_full_reass_t *
447 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
448 ip4_full_reass_main_t * rm,
449 ip4_full_reass_per_thread_t * rt,
450 ip4_full_reass_kv_t * kv, u8 * do_handoff)
452 ip4_full_reass_t *reass;
458 now = vlib_time_now (vm);
459 if (!clib_bihash_search_16_8
460 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv))
463 pool_elt_at_index (rm->per_thread_data
464 [kv->v.memory_owner_thread_index].pool,
466 if (vm->thread_index != reass->memory_owner_thread_index)
472 if (now > reass->last_heard + rm->timeout)
474 ip4_full_reass_drop_all (vm, node, rm, reass);
475 ip4_full_reass_free (rm, rt, reass);
482 reass->last_heard = now;
486 if (rt->reass_n >= rm->max_reass_n)
493 pool_get (rt->pool, reass);
494 clib_memset (reass, 0, sizeof (*reass));
495 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
496 reass->memory_owner_thread_index = vm->thread_index;
498 ip4_full_reass_init (reass);
502 reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0];
503 reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1];
504 kv->v.reass_index = (reass - rt->pool);
505 kv->v.memory_owner_thread_index = vm->thread_index;
506 reass->last_heard = now;
509 clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 2);
512 ip4_full_reass_free_ctx (rt, reass);
514 // if other worker created a context already work with the other copy
522 always_inline ip4_full_reass_rc_t
523 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
524 ip4_full_reass_main_t * rm,
525 ip4_full_reass_per_thread_t * rt,
526 ip4_full_reass_t * reass, u32 * bi0,
527 u32 * next0, u32 * error0, bool is_custom_app)
529 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
530 vlib_buffer_t *last_b = NULL;
531 u32 sub_chain_bi = reass->first_bi;
532 u32 total_length = 0;
536 u32 tmp_bi = sub_chain_bi;
537 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
538 ip4_header_t *ip = vlib_buffer_get_current (tmp);
539 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
540 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
541 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
543 return IP4_REASS_RC_INTERNAL_ERROR;
546 u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
548 ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
550 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
551 if (tmp_bi == reass->first_bi)
553 /* first buffer - keep ip4 header */
554 if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
556 return IP4_REASS_RC_INTERNAL_ERROR;
559 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
560 ip4_header_bytes (ip);
561 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
563 return IP4_REASS_RC_INTERNAL_ERROR;
567 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
573 if (trim_front > tmp->current_length)
575 /* drop whole buffer */
576 u32 to_be_freed_bi = tmp_bi;
577 trim_front -= tmp->current_length;
578 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
580 return IP4_REASS_RC_INTERNAL_ERROR;
582 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
583 tmp_bi = tmp->next_buffer;
584 tmp->next_buffer = 0;
585 tmp = vlib_get_buffer (vm, tmp_bi);
586 vlib_buffer_free_one (vm, to_be_freed_bi);
591 vlib_buffer_advance (tmp, trim_front);
599 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
600 last_b->next_buffer = tmp_bi;
603 if (keep_data <= tmp->current_length)
605 tmp->current_length = keep_data;
610 keep_data -= tmp->current_length;
611 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
613 return IP4_REASS_RC_INTERNAL_ERROR;
616 total_length += tmp->current_length;
617 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
619 tmp_bi = tmp->next_buffer;
620 tmp = vlib_get_buffer (vm, tmp->next_buffer);
629 u32 to_be_freed_bi = tmp_bi;
630 if (reass->first_bi == tmp_bi)
632 return IP4_REASS_RC_INTERNAL_ERROR;
634 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
636 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
637 tmp_bi = tmp->next_buffer;
638 tmp->next_buffer = 0;
639 tmp = vlib_get_buffer (vm, tmp_bi);
640 vlib_buffer_free_one (vm, to_be_freed_bi);
644 tmp->next_buffer = 0;
645 vlib_buffer_free_one (vm, to_be_freed_bi);
651 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
654 while (~0 != sub_chain_bi);
658 return IP4_REASS_RC_INTERNAL_ERROR;
660 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
662 if (total_length < first_b->current_length)
664 return IP4_REASS_RC_INTERNAL_ERROR;
666 total_length -= first_b->current_length;
667 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
668 first_b->total_length_not_including_first_buffer = total_length;
669 ip4_header_t *ip = vlib_buffer_get_current (first_b);
670 ip->flags_and_fragment_offset = 0;
671 ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
672 ip->checksum = ip4_header_checksum (ip);
673 if (!vlib_buffer_chain_linearize (vm, first_b))
675 return IP4_REASS_RC_NO_BUF;
677 // reset to reconstruct the mbuf linking
678 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
679 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
681 ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
684 // following code does a hexdump of packet fragments to stdout ...
687 u32 bi = reass->first_bi;
691 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
692 s = format (s, "%u: %U\n", bi, format_hexdump,
693 vlib_buffer_get_current (b), b->current_length);
694 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
703 printf ("%.*s\n", vec_len (s), s);
710 *bi0 = reass->first_bi;
713 *next0 = IP4_FULL_REASS_NEXT_INPUT;
717 *next0 = reass->next_index;
719 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
720 *error0 = IP4_ERROR_NONE;
721 ip4_full_reass_free (rm, rt, reass);
723 return IP4_REASS_RC_OK;
726 always_inline ip4_full_reass_rc_t
727 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
728 ip4_full_reass_main_t * rm,
729 ip4_full_reass_per_thread_t * rt,
730 ip4_full_reass_t * reass,
731 u32 prev_range_bi, u32 new_next_bi)
733 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
734 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
735 if (~0 != prev_range_bi)
737 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
738 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
739 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
740 prev_vnb->ip.reass.next_range_bi = new_next_bi;
744 if (~0 != reass->first_bi)
746 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
748 reass->first_bi = new_next_bi;
750 vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
751 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
752 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
754 return IP4_REASS_RC_INTERNAL_ERROR;
756 reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
757 return IP4_REASS_RC_OK;
760 always_inline ip4_full_reass_rc_t
761 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
762 vlib_node_runtime_t * node,
763 ip4_full_reass_main_t * rm,
764 ip4_full_reass_t * reass,
765 u32 prev_range_bi, u32 discard_bi)
767 vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
768 vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
769 if (~0 != prev_range_bi)
771 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
772 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
773 if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
775 return IP4_REASS_RC_INTERNAL_ERROR;
777 prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
781 reass->first_bi = discard_vnb->ip.reass.next_range_bi;
783 vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
784 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
785 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
787 return IP4_REASS_RC_INTERNAL_ERROR;
789 reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
792 u32 to_be_freed_bi = discard_bi;
793 if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
795 ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
796 RANGE_DISCARD, 0, ~0);
798 if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
800 discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
801 discard_bi = discard_b->next_buffer;
802 discard_b->next_buffer = 0;
803 discard_b = vlib_get_buffer (vm, discard_bi);
804 vlib_buffer_free_one (vm, to_be_freed_bi);
808 discard_b->next_buffer = 0;
809 vlib_buffer_free_one (vm, to_be_freed_bi);
813 return IP4_REASS_RC_OK;
816 always_inline ip4_full_reass_rc_t
817 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
818 ip4_full_reass_main_t * rm,
819 ip4_full_reass_per_thread_t * rt,
820 ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
821 u32 * error0, bool is_custom_app,
822 u32 * handoff_thread_idx)
824 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
825 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
828 // store (error_)next_index before it's overwritten
829 reass->next_index = fvnb->ip.reass.next_index;
830 reass->error_next_index = fvnb->ip.reass.error_next_index;
832 ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
834 ip4_header_t *fip = vlib_buffer_get_current (fb);
835 const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
836 const u32 fragment_length =
837 clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
838 const u32 fragment_last = fragment_first + fragment_length - 1;
839 fvnb->ip.reass.fragment_first = fragment_first;
840 fvnb->ip.reass.fragment_last = fragment_last;
841 int more_fragments = ip4_get_fragment_more (fip);
842 u32 candidate_range_bi = reass->first_bi;
843 u32 prev_range_bi = ~0;
844 fvnb->ip.reass.range_first = fragment_first;
845 fvnb->ip.reass.range_last = fragment_last;
846 fvnb->ip.reass.next_range_bi = ~0;
849 reass->last_packet_octet = fragment_last;
851 if (~0 == reass->first_bi)
853 // starting a new reassembly
855 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
856 prev_range_bi, *bi0);
857 if (IP4_REASS_RC_OK != rc)
861 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
863 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
867 reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
868 reass->fragments_n = 1;
869 return IP4_REASS_RC_OK;
871 reass->min_fragment_length =
872 clib_min (clib_net_to_host_u16 (fip->length),
873 fvnb->ip.reass.estimated_mtu);
874 while (~0 != candidate_range_bi)
876 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
877 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
878 if (fragment_first > candidate_vnb->ip.reass.range_last)
880 // this fragments starts after candidate range
881 prev_range_bi = candidate_range_bi;
882 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
883 if (candidate_vnb->ip.reass.range_last < fragment_last &&
884 ~0 == candidate_range_bi)
886 // special case - this fragment falls beyond all known ranges
888 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
889 prev_range_bi, *bi0);
890 if (IP4_REASS_RC_OK != rc)
899 if (fragment_last < candidate_vnb->ip.reass.range_first)
901 // this fragment ends before candidate range without any overlap
903 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
904 prev_range_bi, *bi0);
905 if (IP4_REASS_RC_OK != rc)
913 if (fragment_first >= candidate_vnb->ip.reass.range_first &&
914 fragment_last <= candidate_vnb->ip.reass.range_last)
916 // this fragment is a (sub)part of existing range, ignore it
917 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
919 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
920 RANGE_OVERLAP, 0, ~0);
924 int discard_candidate = 0;
925 if (fragment_first < candidate_vnb->ip.reass.range_first)
928 fragment_last - candidate_vnb->ip.reass.range_first + 1;
929 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
931 candidate_vnb->ip.reass.range_first += overlap;
932 if (reass->data_len < overlap)
934 return IP4_REASS_RC_INTERNAL_ERROR;
936 reass->data_len -= overlap;
937 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
939 ip4_full_reass_add_trace (vm, node, rm, reass,
941 RANGE_SHRINK, 0, ~0);
944 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
947 if (IP4_REASS_RC_OK != rc)
955 discard_candidate = 1;
958 else if (fragment_last > candidate_vnb->ip.reass.range_last)
961 candidate_vnb->ip.reass.range_last - fragment_first + 1;
962 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
964 fvnb->ip.reass.range_first += overlap;
965 if (~0 != candidate_vnb->ip.reass.next_range_bi)
967 prev_range_bi = candidate_range_bi;
969 candidate_vnb->ip.reass.next_range_bi;
974 // special case - last range discarded
976 ip4_full_reass_insert_range_in_chain (vm, rm, rt,
980 if (IP4_REASS_RC_OK != rc)
989 discard_candidate = 1;
994 discard_candidate = 1;
996 if (discard_candidate)
998 u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
999 // discard candidate range, probe next range
1001 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1003 candidate_range_bi);
1004 if (IP4_REASS_RC_OK != rc)
1008 if (~0 != next_range_bi)
1010 candidate_range_bi = next_range_bi;
1015 // special case - last range discarded
1017 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1020 if (IP4_REASS_RC_OK != rc)
1030 ++reass->fragments_n;
1033 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1035 ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1039 if (~0 != reass->last_packet_octet &&
1040 reass->data_len == reass->last_packet_octet + 1)
1042 *handoff_thread_idx = reass->sendout_thread_index;
1044 ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1046 if (IP4_REASS_RC_OK == rc
1047 && reass->memory_owner_thread_index != reass->sendout_thread_index)
1049 rc = IP4_REASS_RC_HANDOFF;
1057 if (reass->fragments_n > rm->max_reass_len)
1059 rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1064 *next0 = IP4_FULL_REASS_NEXT_DROP;
1065 *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1072 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1073 vlib_frame_t * frame, bool is_feature,
1076 u32 *from = vlib_frame_vector_args (frame);
1077 u32 n_left_from, n_left_to_next, *to_next, next_index;
1078 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1079 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1080 clib_spinlock_lock (&rt->lock);
1082 n_left_from = frame->n_vectors;
1083 next_index = node->cached_next_index;
1084 while (n_left_from > 0)
1086 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1088 while (n_left_from > 0 && n_left_to_next > 0)
1093 u32 error0 = IP4_ERROR_NONE;
1096 b0 = vlib_get_buffer (vm, bi0);
1098 ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1099 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1101 // this is a whole packet - no fragmentation
1104 next0 = IP4_FULL_REASS_NEXT_INPUT;
1108 next0 = vnet_buffer (b0)->ip.reass.next_index;
1110 goto packet_enqueue;
1112 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1113 const u32 fragment_length =
1114 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1115 const u32 fragment_last = fragment_first + fragment_length - 1;
1116 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
1118 next0 = IP4_FULL_REASS_NEXT_DROP;
1119 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1120 goto packet_enqueue;
1122 ip4_full_reass_kv_t kv;
1126 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1127 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1128 (u64) ip0->src_address.as_u32 << 32;
1130 (u64) ip0->dst_address.
1131 as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1133 ip4_full_reass_t *reass =
1134 ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1139 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1140 if (0 == fragment_first)
1142 reass->sendout_thread_index = vm->thread_index;
1146 if (PREDICT_FALSE (do_handoff))
1148 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1149 vnet_buffer (b0)->ip.reass.owner_thread_index =
1150 kv.v.memory_owner_thread_index;
1154 u32 handoff_thread_idx;
1155 switch (ip4_full_reass_update
1156 (vm, node, rm, rt, reass, &bi0, &next0,
1157 &error0, is_custom_app, &handoff_thread_idx))
1159 case IP4_REASS_RC_OK:
1160 /* nothing to do here */
1162 case IP4_REASS_RC_HANDOFF:
1163 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1164 b0 = vlib_get_buffer (vm, bi0);
1165 vnet_buffer (b0)->ip.reass.owner_thread_index =
1168 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1169 vlib_node_increment_counter (vm, node->node_index,
1170 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1172 ip4_full_reass_drop_all (vm, node, rm, reass);
1173 ip4_full_reass_free (rm, rt, reass);
1176 case IP4_REASS_RC_NO_BUF:
1177 vlib_node_increment_counter (vm, node->node_index,
1178 IP4_ERROR_REASS_NO_BUF, 1);
1179 ip4_full_reass_drop_all (vm, node, rm, reass);
1180 ip4_full_reass_free (rm, rt, reass);
1183 case IP4_REASS_RC_INTERNAL_ERROR:
1184 /* drop everything and start with a clean slate */
1185 vlib_node_increment_counter (vm, node->node_index,
1186 IP4_ERROR_REASS_INTERNAL_ERROR,
1188 ip4_full_reass_drop_all (vm, node, rm, reass);
1189 ip4_full_reass_free (rm, rt, reass);
1196 next0 = IP4_FULL_REASS_NEXT_DROP;
1197 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1202 b0->error = node->errors[error0];
1208 n_left_to_next -= 1;
1209 if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1211 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1213 ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1215 vnet_buffer (b0)->ip.
1216 reass.owner_thread_index);
1219 else if (is_feature && IP4_ERROR_NONE == error0)
1221 b0 = vlib_get_buffer (vm, bi0);
1222 vnet_feature_next (&next0, b0);
1224 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1225 to_next, n_left_to_next,
1227 IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1235 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1238 clib_spinlock_unlock (&rt->lock);
1239 return frame->n_vectors;
1242 static char *ip4_full_reass_error_strings[] = {
1243 #define _(sym, string) string,
1248 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1249 vlib_node_runtime_t * node,
1250 vlib_frame_t * frame)
1252 return ip4_full_reass_inline (vm, node, frame, false /* is_feature */ ,
1253 false /* is_custom_app */ );
1257 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1258 .name = "ip4-full-reassembly",
1259 .vector_size = sizeof (u32),
1260 .format_trace = format_ip4_full_reass_trace,
1261 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1262 .error_strings = ip4_full_reass_error_strings,
1263 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1266 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1267 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1268 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1274 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1275 vlib_node_runtime_t * node,
1276 vlib_frame_t * frame)
1278 return ip4_full_reass_inline (vm, node, frame, true /* is_feature */ ,
1279 false /* is_custom_app */ );
1283 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1284 .name = "ip4-full-reassembly-feature",
1285 .vector_size = sizeof (u32),
1286 .format_trace = format_ip4_full_reass_trace,
1287 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1288 .error_strings = ip4_full_reass_error_strings,
1289 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1292 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1293 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1294 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1300 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1301 .arc_name = "ip4-unicast",
1302 .node_name = "ip4-full-reassembly-feature",
1303 .runs_before = VNET_FEATURES ("ip4-lookup",
1304 "ipsec4-input-feature"),
1309 #ifndef CLIB_MARCH_VARIANT
1311 ip4_full_reass_get_nbuckets ()
1313 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1317 nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1319 for (i = 0; i < 31; i++)
1320 if ((1 << i) >= nbuckets)
1326 #endif /* CLIB_MARCH_VARIANT */
1330 IP4_EVENT_CONFIG_CHANGED = 1,
1331 } ip4_full_reass_event_t;
1336 clib_bihash_16_8_t *new_hash;
1337 } ip4_rehash_cb_ctx;
1339 #ifndef CLIB_MARCH_VARIANT
1341 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1343 ip4_rehash_cb_ctx *ctx = _ctx;
1344 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1351 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1352 u32 max_reassembly_length,
1353 u32 expire_walk_interval_ms)
1355 ip4_full_reass_main.timeout_ms = timeout_ms;
1356 ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1357 ip4_full_reass_main.max_reass_n = max_reassemblies;
1358 ip4_full_reass_main.max_reass_len = max_reassembly_length;
1359 ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1363 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1364 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1366 u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1367 ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1368 max_reassembly_length, expire_walk_interval_ms);
1369 vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1370 ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1371 IP4_EVENT_CONFIG_CHANGED, 0);
1372 u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1373 if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1375 clib_bihash_16_8_t new_hash;
1376 clib_memset (&new_hash, 0, sizeof (new_hash));
1377 ip4_rehash_cb_ctx ctx;
1379 ctx.new_hash = &new_hash;
1380 clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1381 new_nbuckets * 1024);
1382 clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1383 ip4_rehash_cb, &ctx);
1386 clib_bihash_free_16_8 (&new_hash);
1391 clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1392 clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1393 sizeof (ip4_full_reass_main.hash));
1394 clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1401 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1402 u32 * max_reassembly_length,
1403 u32 * expire_walk_interval_ms)
1405 *timeout_ms = ip4_full_reass_main.timeout_ms;
1406 *max_reassemblies = ip4_full_reass_main.max_reass_n;
1407 *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1408 *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1412 static clib_error_t *
1413 ip4_full_reass_init_function (vlib_main_t * vm)
1415 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1416 clib_error_t *error = 0;
1422 vec_validate (rm->per_thread_data, vlib_num_workers ());
1423 ip4_full_reass_per_thread_t *rt;
1424 vec_foreach (rt, rm->per_thread_data)
1426 clib_spinlock_init (&rt->lock);
1427 pool_alloc (rt->pool, rm->max_reass_n);
1430 node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1432 rm->ip4_full_reass_expire_node_idx = node->index;
1434 ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1435 IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1436 IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1437 IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1439 nbuckets = ip4_full_reass_get_nbuckets ();
1440 clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1442 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1444 rm->ip4_drop_idx = node->index;
1446 rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1447 rm->fq_feature_index =
1448 vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1453 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1454 #endif /* CLIB_MARCH_VARIANT */
1457 ip4_full_reass_walk_expired (vlib_main_t * vm,
1458 vlib_node_runtime_t * node, vlib_frame_t * f)
1460 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1461 uword event_type, *event_data = 0;
1465 vlib_process_wait_for_event_or_clock (vm,
1467 rm->expire_walk_interval_ms /
1468 (f64) MSEC_PER_SEC);
1469 event_type = vlib_process_get_events (vm, &event_data);
1473 case ~0: /* no events => timeout */
1474 /* nothing to do here */
1476 case IP4_EVENT_CONFIG_CHANGED:
1479 clib_warning ("BUG: event type 0x%wx", event_type);
1482 f64 now = vlib_time_now (vm);
1484 ip4_full_reass_t *reass;
1485 int *pool_indexes_to_free = NULL;
1487 uword thread_index = 0;
1489 const uword nthreads = vlib_num_workers () + 1;
1490 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1492 ip4_full_reass_per_thread_t *rt =
1493 &rm->per_thread_data[thread_index];
1494 clib_spinlock_lock (&rt->lock);
1496 vec_reset_length (pool_indexes_to_free);
1498 pool_foreach_index (index, rt->pool, ({
1499 reass = pool_elt_at_index (rt->pool, index);
1500 if (now > reass->last_heard + rm->timeout)
1502 vec_add1 (pool_indexes_to_free, index);
1508 vec_foreach (i, pool_indexes_to_free)
1510 ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1511 ip4_full_reass_drop_all (vm, node, rm, reass);
1512 ip4_full_reass_free (rm, rt, reass);
1516 clib_spinlock_unlock (&rt->lock);
1519 vec_free (pool_indexes_to_free);
1522 _vec_len (event_data) = 0;
1530 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1531 .function = ip4_full_reass_walk_expired,
1532 .type = VLIB_NODE_TYPE_PROCESS,
1533 .name = "ip4-full-reassembly-expire-walk",
1534 .format_trace = format_ip4_full_reass_trace,
1535 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1536 .error_strings = ip4_full_reass_error_strings,
1542 format_ip4_full_reass_key (u8 * s, va_list * args)
1544 ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1547 "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1548 key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1549 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1554 format_ip4_reass (u8 * s, va_list * args)
1556 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1557 ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1559 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1560 "last_packet_octet: %u, trace_op_counter: %u\n",
1561 reass->id, format_ip4_full_reass_key, &reass->key,
1562 reass->first_bi, reass->data_len,
1563 reass->last_packet_octet, reass->trace_op_counter);
1565 u32 bi = reass->first_bi;
1569 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1570 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1573 " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1574 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1575 vnb->ip.reass.range_last, bi,
1576 ip4_full_reass_buffer_get_data_offset (b),
1577 ip4_full_reass_buffer_get_data_len (b),
1578 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1579 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1581 bi = b->next_buffer;
1591 static clib_error_t *
1592 show_ip4_reass (vlib_main_t * vm,
1593 unformat_input_t * input,
1594 CLIB_UNUSED (vlib_cli_command_t * lmd))
1596 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1598 vlib_cli_output (vm, "---------------------");
1599 vlib_cli_output (vm, "IP4 reassembly status");
1600 vlib_cli_output (vm, "---------------------");
1601 bool details = false;
1602 if (unformat (input, "details"))
1607 u32 sum_reass_n = 0;
1608 ip4_full_reass_t *reass;
1610 const uword nthreads = vlib_num_workers () + 1;
1611 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1613 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1614 clib_spinlock_lock (&rt->lock);
1618 pool_foreach (reass, rt->pool, {
1619 vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1623 sum_reass_n += rt->reass_n;
1624 clib_spinlock_unlock (&rt->lock);
1626 vlib_cli_output (vm, "---------------------");
1627 vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1628 (long unsigned) sum_reass_n);
1629 vlib_cli_output (vm,
1630 "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n",
1631 (long unsigned) rm->max_reass_n);
1636 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1637 .path = "show ip4-full-reassembly",
1638 .short_help = "show ip4-full-reassembly [details]",
1639 .function = show_ip4_reass,
1643 #ifndef CLIB_MARCH_VARIANT
1645 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1647 return vnet_feature_enable_disable ("ip4-unicast",
1648 "ip4-full-reassembly-feature",
1649 sw_if_index, enable_disable, 0, 0);
1651 #endif /* CLIB_MARCH_VARIANT */
1654 #define foreach_ip4_full_reass_handoff_error \
1655 _(CONGESTION_DROP, "congestion drop")
1660 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1661 foreach_ip4_full_reass_handoff_error
1663 IP4_FULL_REASS_HANDOFF_N_ERROR,
1664 } ip4_full_reass_handoff_error_t;
1666 static char *ip4_full_reass_handoff_error_strings[] = {
1667 #define _(sym,string) string,
1668 foreach_ip4_full_reass_handoff_error
1674 u32 next_worker_index;
1675 } ip4_full_reass_handoff_trace_t;
1678 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1680 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1681 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1682 ip4_full_reass_handoff_trace_t *t =
1683 va_arg (*args, ip4_full_reass_handoff_trace_t *);
1686 format (s, "ip4-full-reassembly-handoff: next-worker %d",
1687 t->next_worker_index);
1693 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1694 vlib_node_runtime_t * node,
1695 vlib_frame_t * frame, bool is_feature)
1697 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1699 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1700 u32 n_enq, n_left_from, *from;
1701 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1704 from = vlib_frame_vector_args (frame);
1705 n_left_from = frame->n_vectors;
1706 vlib_get_buffers (vm, from, bufs, n_left_from);
1709 ti = thread_indices;
1711 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1713 while (n_left_from > 0)
1715 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1718 ((node->flags & VLIB_NODE_FLAG_TRACE)
1719 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1721 ip4_full_reass_handoff_trace_t *t =
1722 vlib_add_trace (vm, node, b[0], sizeof (*t));
1723 t->next_worker_index = ti[0];
1731 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1732 frame->n_vectors, 1);
1734 if (n_enq < frame->n_vectors)
1735 vlib_node_increment_counter (vm, node->node_index,
1736 IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1737 frame->n_vectors - n_enq);
1738 return frame->n_vectors;
1741 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1742 vlib_node_runtime_t * node,
1743 vlib_frame_t * frame)
1745 return ip4_full_reass_handoff_node_inline (vm, node, frame,
1746 false /* is_feature */ );
1751 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1752 .name = "ip4-full-reassembly-handoff",
1753 .vector_size = sizeof (u32),
1754 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1755 .error_strings = ip4_full_reass_handoff_error_strings,
1756 .format_trace = format_ip4_full_reass_handoff_trace,
1768 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1769 vlib_node_runtime_t *
1771 vlib_frame_t * frame)
1773 return ip4_full_reass_handoff_node_inline (vm, node, frame,
1774 true /* is_feature */ );
1780 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1781 .name = "ip4-full-reass-feature-hoff",
1782 .vector_size = sizeof (u32),
1783 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1784 .error_strings = ip4_full_reass_handoff_error_strings,
1785 .format_trace = format_ip4_full_reass_handoff_trace,
1796 * fd.io coding-style-patch-verification: ON
1799 * eval: (c-set-style "gnu")