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_t * reass, u32 bi,
339 ip4_full_reass_trace_operation_e action,
340 u32 size_diff, u32 thread_id_to)
342 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
343 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
344 if (pool_is_free_index
345 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
347 // this buffer's trace is gone
348 b->flags &= ~VLIB_BUFFER_IS_TRACED;
351 bool is_after_handoff = false;
352 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
354 is_after_handoff = true;
356 ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
357 t->is_after_handoff = is_after_handoff;
358 if (t->is_after_handoff)
360 clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
361 clib_min (sizeof (t->ip4_header), b->current_length));
365 t->reass_id = reass->id;
366 t->op_id = reass->trace_op_counter;
367 t->trace_range.first_bi = reass->first_bi;
368 t->total_data_len = reass->data_len;
369 ++reass->trace_op_counter;
375 t->trace_range.first_bi = 0;
376 t->total_data_len = 0;
379 ip4_full_reass_trace_details (vm, bi, &t->trace_range);
380 t->size_diff = size_diff;
381 t->thread_id = vm->thread_index;
382 t->thread_id_to = thread_id_to;
383 t->fragment_first = vnb->ip.reass.fragment_first;
384 t->fragment_last = vnb->ip.reass.fragment_last;
387 s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
388 printf ("%.*s\n", vec_len (s), s);
390 vec_reset_length (s);
395 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
396 ip4_full_reass_t * reass)
398 pool_put (rt->pool, reass);
403 ip4_full_reass_free (ip4_full_reass_main_t * rm,
404 ip4_full_reass_per_thread_t * rt,
405 ip4_full_reass_t * reass)
407 clib_bihash_kv_16_8_t kv;
408 kv.key[0] = reass->key.as_u64[0];
409 kv.key[1] = reass->key.as_u64[1];
410 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
411 return ip4_full_reass_free_ctx (rt, reass);
415 ip4_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
416 ip4_full_reass_t *reass)
418 u32 range_bi = reass->first_bi;
419 vlib_buffer_t *range_b;
420 vnet_buffer_opaque_t *range_vnb;
422 while (~0 != range_bi)
424 range_b = vlib_get_buffer (vm, range_bi);
425 range_vnb = vnet_buffer (range_b);
429 vec_add1 (to_free, bi);
430 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
431 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
434 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
441 range_bi = range_vnb->ip.reass.next_range_bi;
443 /* send to next_error_index */
444 if (~0 != reass->error_next_index)
446 u32 n_left_to_next, *to_next, next_index;
448 next_index = reass->error_next_index;
451 while (vec_len (to_free) > 0)
453 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
455 while (vec_len (to_free) > 0 && n_left_to_next > 0)
457 bi = vec_pop (to_free);
466 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
471 vlib_buffer_free (vm, to_free, vec_len (to_free));
477 ip4_full_reass_init (ip4_full_reass_t * reass)
479 reass->first_bi = ~0;
480 reass->last_packet_octet = ~0;
482 reass->next_index = ~0;
483 reass->error_next_index = ~0;
486 always_inline ip4_full_reass_t *
487 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
488 ip4_full_reass_main_t * rm,
489 ip4_full_reass_per_thread_t * rt,
490 ip4_full_reass_kv_t * kv, u8 * do_handoff)
492 ip4_full_reass_t *reass;
498 now = vlib_time_now (vm);
499 if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
501 if (vm->thread_index != kv->v.memory_owner_thread_index)
507 pool_elt_at_index (rm->per_thread_data
508 [kv->v.memory_owner_thread_index].pool,
511 if (now > reass->last_heard + rm->timeout)
513 ip4_full_reass_drop_all (vm, node, reass);
514 ip4_full_reass_free (rm, rt, reass);
521 reass->last_heard = now;
525 if (rt->reass_n >= rm->max_reass_n)
532 pool_get (rt->pool, reass);
533 clib_memset (reass, 0, sizeof (*reass));
534 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
535 reass->memory_owner_thread_index = vm->thread_index;
537 ip4_full_reass_init (reass);
541 reass->key.as_u64[0] = kv->kv.key[0];
542 reass->key.as_u64[1] = kv->kv.key[1];
543 kv->v.reass_index = (reass - rt->pool);
544 kv->v.memory_owner_thread_index = vm->thread_index;
545 reass->last_heard = now;
547 int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
550 ip4_full_reass_free_ctx (rt, reass);
552 // if other worker created a context already work with the other copy
560 always_inline ip4_full_reass_rc_t
561 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
562 ip4_full_reass_main_t * rm,
563 ip4_full_reass_per_thread_t * rt,
564 ip4_full_reass_t * reass, u32 * bi0,
565 u32 * next0, u32 * error0, bool is_custom)
567 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
568 vlib_buffer_t *last_b = NULL;
569 u32 sub_chain_bi = reass->first_bi;
570 u32 total_length = 0;
574 u32 tmp_bi = sub_chain_bi;
575 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
576 ip4_header_t *ip = vlib_buffer_get_current (tmp);
577 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
578 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
579 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
581 return IP4_REASS_RC_INTERNAL_ERROR;
584 u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
586 ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
588 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
589 if (tmp_bi == reass->first_bi)
591 /* first buffer - keep ip4 header */
592 if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
594 return IP4_REASS_RC_INTERNAL_ERROR;
597 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
598 ip4_header_bytes (ip);
599 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
601 return IP4_REASS_RC_INTERNAL_ERROR;
605 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
611 if (trim_front > tmp->current_length)
613 /* drop whole buffer */
614 u32 to_be_freed_bi = tmp_bi;
615 trim_front -= tmp->current_length;
616 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
618 return IP4_REASS_RC_INTERNAL_ERROR;
620 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
621 tmp_bi = tmp->next_buffer;
622 tmp->next_buffer = 0;
623 tmp = vlib_get_buffer (vm, tmp_bi);
624 vlib_buffer_free_one (vm, to_be_freed_bi);
629 vlib_buffer_advance (tmp, trim_front);
637 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
638 last_b->next_buffer = tmp_bi;
641 if (keep_data <= tmp->current_length)
643 tmp->current_length = keep_data;
648 keep_data -= tmp->current_length;
649 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
651 return IP4_REASS_RC_INTERNAL_ERROR;
654 total_length += tmp->current_length;
655 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
657 tmp_bi = tmp->next_buffer;
658 tmp = vlib_get_buffer (vm, tmp->next_buffer);
667 u32 to_be_freed_bi = tmp_bi;
668 if (reass->first_bi == tmp_bi)
670 return IP4_REASS_RC_INTERNAL_ERROR;
672 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
674 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
675 tmp_bi = tmp->next_buffer;
676 tmp->next_buffer = 0;
677 tmp = vlib_get_buffer (vm, tmp_bi);
678 vlib_buffer_free_one (vm, to_be_freed_bi);
682 tmp->next_buffer = 0;
683 vlib_buffer_free_one (vm, to_be_freed_bi);
689 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
692 while (~0 != sub_chain_bi);
696 return IP4_REASS_RC_INTERNAL_ERROR;
698 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
700 if (total_length < first_b->current_length)
702 return IP4_REASS_RC_INTERNAL_ERROR;
704 total_length -= first_b->current_length;
705 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
706 first_b->total_length_not_including_first_buffer = total_length;
707 ip4_header_t *ip = vlib_buffer_get_current (first_b);
708 ip->flags_and_fragment_offset = 0;
709 ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
710 ip->checksum = ip4_header_checksum (ip);
711 if (!vlib_buffer_chain_linearize (vm, first_b))
713 return IP4_REASS_RC_NO_BUF;
715 // reset to reconstruct the mbuf linking
716 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
717 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
719 ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
722 // following code does a hexdump of packet fragments to stdout ...
725 u32 bi = reass->first_bi;
729 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
730 s = format (s, "%u: %U\n", bi, format_hexdump,
731 vlib_buffer_get_current (b), b->current_length);
732 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
741 printf ("%.*s\n", vec_len (s), s);
748 *bi0 = reass->first_bi;
751 *next0 = IP4_FULL_REASS_NEXT_INPUT;
755 *next0 = reass->next_index;
757 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
758 *error0 = IP4_ERROR_NONE;
759 ip4_full_reass_free (rm, rt, reass);
761 return IP4_REASS_RC_OK;
764 always_inline ip4_full_reass_rc_t
765 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
766 ip4_full_reass_t * reass,
767 u32 prev_range_bi, u32 new_next_bi)
769 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
770 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
771 if (~0 != prev_range_bi)
773 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
774 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
775 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
776 prev_vnb->ip.reass.next_range_bi = new_next_bi;
780 if (~0 != reass->first_bi)
782 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
784 reass->first_bi = new_next_bi;
786 vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
787 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
788 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
790 return IP4_REASS_RC_INTERNAL_ERROR;
792 reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
793 return IP4_REASS_RC_OK;
796 always_inline ip4_full_reass_rc_t
797 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
798 vlib_node_runtime_t * node,
799 ip4_full_reass_t * reass,
800 u32 prev_range_bi, u32 discard_bi)
802 vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
803 vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
804 if (~0 != prev_range_bi)
806 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
807 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
808 if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
810 return IP4_REASS_RC_INTERNAL_ERROR;
812 prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
816 reass->first_bi = discard_vnb->ip.reass.next_range_bi;
818 vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
819 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
820 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
822 return IP4_REASS_RC_INTERNAL_ERROR;
824 reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
827 u32 to_be_freed_bi = discard_bi;
828 if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
830 ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
833 if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
835 discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
836 discard_bi = discard_b->next_buffer;
837 discard_b->next_buffer = 0;
838 discard_b = vlib_get_buffer (vm, discard_bi);
839 vlib_buffer_free_one (vm, to_be_freed_bi);
843 discard_b->next_buffer = 0;
844 vlib_buffer_free_one (vm, to_be_freed_bi);
848 return IP4_REASS_RC_OK;
851 always_inline ip4_full_reass_rc_t
852 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
853 ip4_full_reass_main_t * rm,
854 ip4_full_reass_per_thread_t * rt,
855 ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
856 u32 * error0, bool is_custom, u32 * handoff_thread_idx)
858 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
859 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
862 // store (error_)next_index before it's overwritten
863 reass->next_index = fvnb->ip.reass.next_index;
864 reass->error_next_index = fvnb->ip.reass.error_next_index;
866 ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
868 ip4_header_t *fip = vlib_buffer_get_current (fb);
869 const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
870 const u32 fragment_length =
871 clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
872 const u32 fragment_last = fragment_first + fragment_length - 1;
873 fvnb->ip.reass.fragment_first = fragment_first;
874 fvnb->ip.reass.fragment_last = fragment_last;
875 int more_fragments = ip4_get_fragment_more (fip);
876 u32 candidate_range_bi = reass->first_bi;
877 u32 prev_range_bi = ~0;
878 fvnb->ip.reass.range_first = fragment_first;
879 fvnb->ip.reass.range_last = fragment_last;
880 fvnb->ip.reass.next_range_bi = ~0;
883 reass->last_packet_octet = fragment_last;
885 if (~0 == reass->first_bi)
887 // starting a new reassembly
889 ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
890 if (IP4_REASS_RC_OK != rc)
894 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
896 ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
899 reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
900 reass->fragments_n = 1;
901 return IP4_REASS_RC_OK;
903 reass->min_fragment_length =
904 clib_min (clib_net_to_host_u16 (fip->length),
905 fvnb->ip.reass.estimated_mtu);
906 while (~0 != candidate_range_bi)
908 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
909 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
910 if (fragment_first > candidate_vnb->ip.reass.range_last)
912 // this fragments starts after candidate range
913 prev_range_bi = candidate_range_bi;
914 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
915 if (candidate_vnb->ip.reass.range_last < fragment_last &&
916 ~0 == candidate_range_bi)
918 // special case - this fragment falls beyond all known ranges
919 rc = ip4_full_reass_insert_range_in_chain (vm, 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
933 rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
935 if (IP4_REASS_RC_OK != rc)
943 if (fragment_first >= candidate_vnb->ip.reass.range_first &&
944 fragment_last <= candidate_vnb->ip.reass.range_last)
946 // this fragment is a (sub)part of existing range, ignore it
947 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
949 ip4_full_reass_add_trace (vm, node, reass, *bi0,
950 RANGE_OVERLAP, 0, ~0);
954 int discard_candidate = 0;
955 if (fragment_first < candidate_vnb->ip.reass.range_first)
958 fragment_last - candidate_vnb->ip.reass.range_first + 1;
959 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
961 candidate_vnb->ip.reass.range_first += overlap;
962 if (reass->data_len < overlap)
964 return IP4_REASS_RC_INTERNAL_ERROR;
966 reass->data_len -= overlap;
967 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
969 ip4_full_reass_add_trace (vm, node, reass,
971 RANGE_SHRINK, 0, ~0);
973 rc = ip4_full_reass_insert_range_in_chain (
974 vm, reass, prev_range_bi, *bi0);
975 if (IP4_REASS_RC_OK != rc)
983 discard_candidate = 1;
986 else if (fragment_last > candidate_vnb->ip.reass.range_last)
989 candidate_vnb->ip.reass.range_last - fragment_first + 1;
990 if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
992 fvnb->ip.reass.range_first += overlap;
993 if (~0 != candidate_vnb->ip.reass.next_range_bi)
995 prev_range_bi = candidate_range_bi;
997 candidate_vnb->ip.reass.next_range_bi;
1002 // special case - last range discarded
1003 rc = ip4_full_reass_insert_range_in_chain (
1004 vm, reass, candidate_range_bi, *bi0);
1005 if (IP4_REASS_RC_OK != rc)
1014 discard_candidate = 1;
1019 discard_candidate = 1;
1021 if (discard_candidate)
1023 u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1024 // discard candidate range, probe next range
1025 rc = ip4_full_reass_remove_range_from_chain (
1026 vm, node, reass, prev_range_bi, candidate_range_bi);
1027 if (IP4_REASS_RC_OK != rc)
1031 if (~0 != next_range_bi)
1033 candidate_range_bi = next_range_bi;
1038 // special case - last range discarded
1039 rc = ip4_full_reass_insert_range_in_chain (
1040 vm, reass, prev_range_bi, *bi0);
1041 if (IP4_REASS_RC_OK != rc)
1051 ++reass->fragments_n;
1054 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1056 ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1059 if (~0 != reass->last_packet_octet &&
1060 reass->data_len == reass->last_packet_octet + 1)
1062 *handoff_thread_idx = reass->sendout_thread_index;
1064 reass->memory_owner_thread_index != reass->sendout_thread_index;
1066 ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1068 if (IP4_REASS_RC_OK == rc && handoff)
1070 rc = IP4_REASS_RC_HANDOFF;
1078 if (reass->fragments_n > rm->max_reass_len)
1080 rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1085 *next0 = IP4_FULL_REASS_NEXT_DROP;
1086 *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1093 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1094 vlib_frame_t * frame, ip4_full_reass_node_type_t type)
1096 u32 *from = vlib_frame_vector_args (frame);
1097 u32 n_left_from, n_left_to_next, *to_next, next_index;
1098 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1099 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1100 clib_spinlock_lock (&rt->lock);
1102 n_left_from = frame->n_vectors;
1103 next_index = node->cached_next_index;
1104 while (n_left_from > 0)
1106 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1108 while (n_left_from > 0 && n_left_to_next > 0)
1113 u32 error0 = IP4_ERROR_NONE;
1116 b0 = vlib_get_buffer (vm, bi0);
1118 ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1119 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1121 // this is a whole packet - no fragmentation
1124 next0 = IP4_FULL_REASS_NEXT_INPUT;
1128 next0 = vnet_buffer (b0)->ip.reass.next_index;
1130 goto packet_enqueue;
1132 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1133 const u32 fragment_length =
1134 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1135 const u32 fragment_last = fragment_first + fragment_length - 1;
1136 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
1138 next0 = IP4_FULL_REASS_NEXT_DROP;
1139 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1140 goto packet_enqueue;
1142 ip4_full_reass_kv_t kv;
1146 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1147 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1148 (u64) ip0->src_address.as_u32 << 32;
1150 (u64) ip0->dst_address.
1151 as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1153 ip4_full_reass_t *reass =
1154 ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1159 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1160 if (0 == fragment_first)
1162 reass->sendout_thread_index = vm->thread_index;
1166 if (PREDICT_FALSE (do_handoff))
1168 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1169 vnet_buffer (b0)->ip.reass.owner_thread_index =
1170 kv.v.memory_owner_thread_index;
1174 u32 handoff_thread_idx;
1175 switch (ip4_full_reass_update
1176 (vm, node, rm, rt, reass, &bi0, &next0,
1177 &error0, CUSTOM == type, &handoff_thread_idx))
1179 case IP4_REASS_RC_OK:
1180 /* nothing to do here */
1182 case IP4_REASS_RC_HANDOFF:
1183 next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1184 b0 = vlib_get_buffer (vm, bi0);
1185 vnet_buffer (b0)->ip.reass.owner_thread_index =
1188 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1189 vlib_node_increment_counter (vm, node->node_index,
1190 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1192 ip4_full_reass_drop_all (vm, node, reass);
1193 ip4_full_reass_free (rm, rt, reass);
1196 case IP4_REASS_RC_NO_BUF:
1197 vlib_node_increment_counter (vm, node->node_index,
1198 IP4_ERROR_REASS_NO_BUF, 1);
1199 ip4_full_reass_drop_all (vm, node, reass);
1200 ip4_full_reass_free (rm, rt, reass);
1203 case IP4_REASS_RC_INTERNAL_ERROR:
1204 /* drop everything and start with a clean slate */
1205 vlib_node_increment_counter (vm, node->node_index,
1206 IP4_ERROR_REASS_INTERNAL_ERROR,
1208 ip4_full_reass_drop_all (vm, node, reass);
1209 ip4_full_reass_free (rm, rt, reass);
1216 next0 = IP4_FULL_REASS_NEXT_DROP;
1217 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1227 n_left_to_next -= 1;
1229 /* bi0 might have been updated by reass_finalize, reload */
1230 b0 = vlib_get_buffer (vm, bi0);
1231 if (IP4_ERROR_NONE != error0)
1233 b0->error = node->errors[error0];
1236 if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1238 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1240 ip4_full_reass_add_trace (
1241 vm, node, NULL, bi0, HANDOFF, 0,
1242 vnet_buffer (b0)->ip.reass.owner_thread_index);
1245 else if (FEATURE == type && IP4_ERROR_NONE == error0)
1247 vnet_feature_next (&next0, b0);
1249 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1250 to_next, n_left_to_next,
1252 IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1260 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1263 clib_spinlock_unlock (&rt->lock);
1264 return frame->n_vectors;
1267 static char *ip4_full_reass_error_strings[] = {
1268 #define _(sym, string) string,
1273 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1274 vlib_node_runtime_t * node,
1275 vlib_frame_t * frame)
1277 return ip4_full_reass_inline (vm, node, frame, NORMAL);
1280 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1281 .name = "ip4-full-reassembly",
1282 .vector_size = sizeof (u32),
1283 .format_trace = format_ip4_full_reass_trace,
1284 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1285 .error_strings = ip4_full_reass_error_strings,
1286 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1289 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1290 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1291 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1296 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1297 vlib_node_runtime_t * node,
1298 vlib_frame_t * frame)
1300 return ip4_full_reass_inline (vm, node, frame, FEATURE);
1303 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1304 .name = "ip4-full-reassembly-feature",
1305 .vector_size = sizeof (u32),
1306 .format_trace = format_ip4_full_reass_trace,
1307 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1308 .error_strings = ip4_full_reass_error_strings,
1309 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1312 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1313 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1314 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1318 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1319 .arc_name = "ip4-unicast",
1320 .node_name = "ip4-full-reassembly-feature",
1321 .runs_before = VNET_FEATURES ("ip4-lookup",
1322 "ipsec4-input-feature"),
1326 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1327 vlib_node_runtime_t * node,
1328 vlib_frame_t * frame)
1330 return ip4_full_reass_inline (vm, node, frame, CUSTOM);
1333 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1334 .name = "ip4-full-reassembly-custom",
1335 .vector_size = sizeof (u32),
1336 .format_trace = format_ip4_full_reass_trace,
1337 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1338 .error_strings = ip4_full_reass_error_strings,
1339 .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1342 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1343 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1344 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1348 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1349 .arc_name = "ip4-unicast",
1350 .node_name = "ip4-full-reassembly-feature",
1351 .runs_before = VNET_FEATURES ("ip4-lookup",
1352 "ipsec4-input-feature"),
1357 #ifndef CLIB_MARCH_VARIANT
1359 ip4_full_reass_custom_register_next_node (uword node_index)
1361 return vlib_node_add_next (vlib_get_main (),
1362 ip4_full_reass_node_custom.index, node_index);
1366 ip4_full_reass_get_nbuckets ()
1368 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1372 nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1374 for (i = 0; i < 31; i++)
1375 if ((1 << i) >= nbuckets)
1381 #endif /* CLIB_MARCH_VARIANT */
1385 IP4_EVENT_CONFIG_CHANGED = 1,
1386 } ip4_full_reass_event_t;
1391 clib_bihash_16_8_t *new_hash;
1392 } ip4_rehash_cb_ctx;
1394 #ifndef CLIB_MARCH_VARIANT
1396 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1398 ip4_rehash_cb_ctx *ctx = _ctx;
1399 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1403 return (BIHASH_WALK_CONTINUE);
1407 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1408 u32 max_reassembly_length,
1409 u32 expire_walk_interval_ms)
1411 ip4_full_reass_main.timeout_ms = timeout_ms;
1412 ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1413 ip4_full_reass_main.max_reass_n = max_reassemblies;
1414 ip4_full_reass_main.max_reass_len = max_reassembly_length;
1415 ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1419 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1420 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1422 u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1423 ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1424 max_reassembly_length, expire_walk_interval_ms);
1425 vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1426 ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1427 IP4_EVENT_CONFIG_CHANGED, 0);
1428 u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1429 if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1431 clib_bihash_16_8_t new_hash;
1432 clib_memset (&new_hash, 0, sizeof (new_hash));
1433 ip4_rehash_cb_ctx ctx;
1435 ctx.new_hash = &new_hash;
1436 clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1437 new_nbuckets * 1024);
1438 clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1439 ip4_rehash_cb, &ctx);
1442 clib_bihash_free_16_8 (&new_hash);
1447 clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1448 clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1449 sizeof (ip4_full_reass_main.hash));
1450 clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1457 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1458 u32 * max_reassembly_length,
1459 u32 * expire_walk_interval_ms)
1461 *timeout_ms = ip4_full_reass_main.timeout_ms;
1462 *max_reassemblies = ip4_full_reass_main.max_reass_n;
1463 *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1464 *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1468 static clib_error_t *
1469 ip4_full_reass_init_function (vlib_main_t * vm)
1471 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1472 clib_error_t *error = 0;
1478 vec_validate (rm->per_thread_data, vlib_num_workers ());
1479 ip4_full_reass_per_thread_t *rt;
1480 vec_foreach (rt, rm->per_thread_data)
1482 clib_spinlock_init (&rt->lock);
1483 pool_alloc (rt->pool, rm->max_reass_n);
1486 node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1488 rm->ip4_full_reass_expire_node_idx = node->index;
1490 ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1491 IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1492 IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1493 IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1495 nbuckets = ip4_full_reass_get_nbuckets ();
1496 clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1498 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1500 rm->ip4_drop_idx = node->index;
1502 rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1503 rm->fq_feature_index =
1504 vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1505 rm->fq_custom_index =
1506 vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1508 rm->feature_use_refcount_per_intf = NULL;
1512 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1513 #endif /* CLIB_MARCH_VARIANT */
1516 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1517 CLIB_UNUSED (vlib_frame_t *f))
1519 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1520 uword event_type, *event_data = 0;
1524 vlib_process_wait_for_event_or_clock (vm,
1526 rm->expire_walk_interval_ms /
1527 (f64) MSEC_PER_SEC);
1528 event_type = vlib_process_get_events (vm, &event_data);
1533 /* no events => timeout */
1535 case IP4_EVENT_CONFIG_CHANGED:
1536 /* nothing to do here */
1539 clib_warning ("BUG: event type 0x%wx", event_type);
1542 f64 now = vlib_time_now (vm);
1544 ip4_full_reass_t *reass;
1545 int *pool_indexes_to_free = NULL;
1547 uword thread_index = 0;
1549 const uword nthreads = vlib_num_workers () + 1;
1550 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1552 ip4_full_reass_per_thread_t *rt =
1553 &rm->per_thread_data[thread_index];
1554 clib_spinlock_lock (&rt->lock);
1556 vec_reset_length (pool_indexes_to_free);
1557 pool_foreach_index (index, rt->pool) {
1558 reass = pool_elt_at_index (rt->pool, index);
1559 if (now > reass->last_heard + rm->timeout)
1561 vec_add1 (pool_indexes_to_free, index);
1565 vec_foreach (i, pool_indexes_to_free)
1567 ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1568 ip4_full_reass_drop_all (vm, node, reass);
1569 ip4_full_reass_free (rm, rt, reass);
1572 clib_spinlock_unlock (&rt->lock);
1575 vec_free (pool_indexes_to_free);
1578 _vec_len (event_data) = 0;
1585 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1586 .function = ip4_full_reass_walk_expired,
1587 .type = VLIB_NODE_TYPE_PROCESS,
1588 .name = "ip4-full-reassembly-expire-walk",
1589 .format_trace = format_ip4_full_reass_trace,
1590 .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1591 .error_strings = ip4_full_reass_error_strings,
1596 format_ip4_full_reass_key (u8 * s, va_list * args)
1598 ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1601 "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1602 key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1603 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1608 format_ip4_reass (u8 * s, va_list * args)
1610 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1611 ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1613 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1614 "last_packet_octet: %u, trace_op_counter: %u\n",
1615 reass->id, format_ip4_full_reass_key, &reass->key,
1616 reass->first_bi, reass->data_len,
1617 reass->last_packet_octet, reass->trace_op_counter);
1619 u32 bi = reass->first_bi;
1623 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1624 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1627 " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1628 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1629 vnb->ip.reass.range_last, bi,
1630 ip4_full_reass_buffer_get_data_offset (b),
1631 ip4_full_reass_buffer_get_data_len (b),
1632 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1633 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1635 bi = b->next_buffer;
1645 static clib_error_t *
1646 show_ip4_reass (vlib_main_t * vm,
1647 unformat_input_t * input,
1648 CLIB_UNUSED (vlib_cli_command_t * lmd))
1650 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1652 vlib_cli_output (vm, "---------------------");
1653 vlib_cli_output (vm, "IP4 reassembly status");
1654 vlib_cli_output (vm, "---------------------");
1655 bool details = false;
1656 if (unformat (input, "details"))
1661 u32 sum_reass_n = 0;
1662 ip4_full_reass_t *reass;
1664 const uword nthreads = vlib_num_workers () + 1;
1665 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1667 ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1668 clib_spinlock_lock (&rt->lock);
1671 pool_foreach (reass, rt->pool) {
1672 vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1675 sum_reass_n += rt->reass_n;
1676 clib_spinlock_unlock (&rt->lock);
1678 vlib_cli_output (vm, "---------------------");
1679 vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1680 (long unsigned) sum_reass_n);
1681 vlib_cli_output (vm,
1682 "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1683 (long unsigned) rm->max_reass_n);
1684 vlib_cli_output (vm,
1685 "Maximum configured amount of fragments "
1686 "per full IP4 reassembly: %lu\n",
1687 (long unsigned) rm->max_reass_len);
1688 vlib_cli_output (vm,
1689 "Maximum configured full IP4 reassembly timeout: %lums\n",
1690 (long unsigned) rm->timeout_ms);
1691 vlib_cli_output (vm,
1692 "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1693 (long unsigned) rm->expire_walk_interval_ms);
1697 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1698 .path = "show ip4-full-reassembly",
1699 .short_help = "show ip4-full-reassembly [details]",
1700 .function = show_ip4_reass,
1703 #ifndef CLIB_MARCH_VARIANT
1705 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1707 return vnet_feature_enable_disable ("ip4-unicast",
1708 "ip4-full-reassembly-feature",
1709 sw_if_index, enable_disable, 0, 0);
1711 #endif /* CLIB_MARCH_VARIANT */
1714 #define foreach_ip4_full_reass_handoff_error \
1715 _(CONGESTION_DROP, "congestion drop")
1720 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1721 foreach_ip4_full_reass_handoff_error
1723 IP4_FULL_REASS_HANDOFF_N_ERROR,
1724 } ip4_full_reass_handoff_error_t;
1726 static char *ip4_full_reass_handoff_error_strings[] = {
1727 #define _(sym,string) string,
1728 foreach_ip4_full_reass_handoff_error
1734 u32 next_worker_index;
1735 } ip4_full_reass_handoff_trace_t;
1738 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1740 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1741 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1742 ip4_full_reass_handoff_trace_t *t =
1743 va_arg (*args, ip4_full_reass_handoff_trace_t *);
1746 format (s, "ip4-full-reassembly-handoff: next-worker %d",
1747 t->next_worker_index);
1753 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1754 vlib_node_runtime_t * node,
1755 vlib_frame_t * frame,
1756 ip4_full_reass_node_type_t type)
1758 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1760 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1761 u32 n_enq, n_left_from, *from;
1762 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1765 from = vlib_frame_vector_args (frame);
1766 n_left_from = frame->n_vectors;
1767 vlib_get_buffers (vm, from, bufs, n_left_from);
1770 ti = thread_indices;
1775 fq_index = rm->fq_index;
1778 fq_index = rm->fq_feature_index;
1781 fq_index = rm->fq_custom_index;
1784 clib_warning ("Unexpected `type' (%d)!", type);
1788 while (n_left_from > 0)
1790 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1793 ((node->flags & VLIB_NODE_FLAG_TRACE)
1794 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1796 ip4_full_reass_handoff_trace_t *t =
1797 vlib_add_trace (vm, node, b[0], sizeof (*t));
1798 t->next_worker_index = ti[0];
1805 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1806 thread_indices, frame->n_vectors, 1);
1808 if (n_enq < frame->n_vectors)
1809 vlib_node_increment_counter (vm, node->node_index,
1810 IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1811 frame->n_vectors - n_enq);
1812 return frame->n_vectors;
1815 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1816 vlib_node_runtime_t * node,
1817 vlib_frame_t * frame)
1819 return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
1823 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1824 .name = "ip4-full-reassembly-handoff",
1825 .vector_size = sizeof (u32),
1826 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1827 .error_strings = ip4_full_reass_handoff_error_strings,
1828 .format_trace = format_ip4_full_reass_handoff_trace,
1838 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1839 vlib_node_runtime_t *
1841 vlib_frame_t * frame)
1843 return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
1847 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1848 .name = "ip4-full-reass-feature-hoff",
1849 .vector_size = sizeof (u32),
1850 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1851 .error_strings = ip4_full_reass_handoff_error_strings,
1852 .format_trace = format_ip4_full_reass_handoff_trace,
1861 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1862 vlib_node_runtime_t *
1864 vlib_frame_t * frame)
1866 return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
1870 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1871 .name = "ip4-full-reass-custom-hoff",
1872 .vector_size = sizeof (u32),
1873 .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1874 .error_strings = ip4_full_reass_handoff_error_strings,
1875 .format_trace = format_ip4_full_reass_handoff_trace,
1884 #ifndef CLIB_MARCH_VARIANT
1886 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1888 ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1889 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1892 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1894 ++rm->feature_use_refcount_per_intf[sw_if_index];
1895 return vnet_feature_enable_disable ("ip4-unicast",
1896 "ip4-full-reassembly-feature",
1897 sw_if_index, 1, 0, 0);
1899 ++rm->feature_use_refcount_per_intf[sw_if_index];
1903 --rm->feature_use_refcount_per_intf[sw_if_index];
1904 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1905 return vnet_feature_enable_disable ("ip4-unicast",
1906 "ip4-full-reassembly-feature",
1907 sw_if_index, 0, 0, 0);
1914 * fd.io coding-style-patch-verification: ON
1917 * eval: (c-set-style "gnu")