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 Reassembly.
20 * This file contains the source code for IPv4 reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vppinfra/bihash_16_8.h>
27 #include <vnet/ip/ip4_reassembly.h>
30 #define MSEC_PER_SEC 1000
31 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
32 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
33 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
34 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
35 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
37 #define IP4_REASS_DEBUG_BUFFERS 0
38 #if IP4_REASS_DEBUG_BUFFERS
39 #define IP4_REASS_DEBUG_BUFFER(bi, what) \
43 printf (#what "buffer %u", _bi); \
44 vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
45 while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \
47 _bi = _b->next_buffer; \
48 printf ("[%u]", _bi); \
49 _b = vlib_get_buffer (vm, _bi); \
56 #define IP4_REASS_DEBUG_BUFFER(...)
62 IP4_REASS_RC_TOO_MANY_FRAGMENTS,
63 IP4_REASS_RC_INTERNAL_ERROR,
90 u32 memory_owner_thread_index;
102 clib_bihash_kv_16_8_t kv;
106 ip4_reass_buffer_get_data_offset (vlib_buffer_t * b)
108 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
109 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
113 ip4_reass_buffer_get_data_len (vlib_buffer_t * b)
115 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
116 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
117 (vnb->ip.reass.fragment_first + ip4_reass_buffer_get_data_offset (b)) + 1;
124 // time when last packet was received
126 // internal id of this reassembly
128 // buffer index of first buffer in this reassembly context
130 // last octet of packet, ~0 until fragment without more_fragments arrives
131 u32 last_packet_octet;
132 // length of data collected so far
134 // trace operation counter
135 u32 trace_op_counter;
136 // next index - used by non-feature node
138 // error next index - used by custom apps (~0 if not used)
139 u32 error_next_index;
140 // minimum fragment length for this reassembly - used to estimate MTU
141 u16 min_fragment_length;
142 // number of fragments in this reassembly
144 // thread owning memory for this context (whose pool contains this ctx)
145 u32 memory_owner_thread_index;
146 // thread which received fragment with offset 0 and which sends out the
147 // completed reassembly
148 u32 sendout_thread_index;
153 // pool of reassembly contexts
157 clib_spinlock_t lock;
158 } ip4_reass_per_thread_t;
165 u32 expire_walk_interval_ms;
166 // maximum number of fragments in one reassembly
168 // maximum number of reassemblies
172 clib_bihash_16_8_t hash;
174 ip4_reass_per_thread_t *per_thread_data;
177 vlib_main_t *vlib_main;
179 // node index of ip4-drop node
181 u32 ip4_reass_expire_node_idx;
183 /** Worker handoff */
185 u32 fq_feature_index;
188 extern ip4_reass_main_t ip4_reass_main;
190 #ifndef CLIB_MARCH_VARIANT
191 ip4_reass_main_t ip4_reass_main;
192 #endif /* CLIB_MARCH_VARIANT */
196 IP4_REASSEMBLY_NEXT_INPUT,
197 IP4_REASSEMBLY_NEXT_DROP,
198 IP4_REASSEMBLY_NEXT_HANDOFF,
199 IP4_REASSEMBLY_N_NEXT,
210 } ip4_reass_trace_operation_e;
220 } ip4_reass_range_trace_t;
224 ip4_reass_trace_operation_e action;
226 ip4_reass_range_trace_t trace_range;
236 extern vlib_node_registration_t ip4_reass_node;
237 extern vlib_node_registration_t ip4_reass_node_feature;
240 ip4_reass_trace_details (vlib_main_t * vm, u32 bi,
241 ip4_reass_range_trace_t * trace)
243 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
244 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
245 trace->range_first = vnb->ip.reass.range_first;
246 trace->range_last = vnb->ip.reass.range_last;
247 trace->data_offset = ip4_reass_buffer_get_data_offset (b);
248 trace->data_len = ip4_reass_buffer_get_data_len (b);
249 trace->range_bi = bi;
253 format_ip4_reass_range_trace (u8 * s, va_list * args)
255 ip4_reass_range_trace_t *trace = va_arg (*args, ip4_reass_range_trace_t *);
256 s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
257 trace->range_last, trace->data_offset, trace->data_len,
263 format_ip4_reass_trace (u8 * s, va_list * args)
265 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
266 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
267 ip4_reass_trace_t *t = va_arg (*args, ip4_reass_trace_t *);
269 if (~0 != t->reass_id)
271 s = format (s, "reass id: %u, op id: %u, ", t->reass_id, t->op_id);
272 indent = format_get_indent (s);
275 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
276 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
282 s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
283 format_ip4_reass_range_trace, &t->trace_range,
287 s = format (s, "\n%Udiscard %U", format_white_space, indent,
288 format_ip4_reass_range_trace, &t->trace_range);
291 s = format (s, "\n%Unew %U", format_white_space, indent,
292 format_ip4_reass_range_trace, &t->trace_range);
295 s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
296 format_ip4_reass_range_trace, &t->trace_range);
299 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
303 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
311 ip4_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
312 ip4_reass_main_t * rm, u32 reass_id, u32 op_id,
313 u32 bi, u32 first_bi, u32 data_len,
314 ip4_reass_trace_operation_e action, u32 size_diff,
317 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
318 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
319 ip4_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
320 t->reass_id = reass_id;
322 ip4_reass_trace_details (vm, bi, &t->trace_range);
323 t->size_diff = size_diff;
325 t->thread_id = vm->thread_index;
326 t->thread_id_to = thread_id_to;
327 t->fragment_first = vnb->ip.reass.fragment_first;
328 t->fragment_last = vnb->ip.reass.fragment_last;
329 t->trace_range.first_bi = first_bi;
330 t->total_data_len = data_len;
333 s = format (s, "%U", format_ip4_reass_trace, NULL, NULL, t);
334 printf ("%.*s\n", vec_len (s), s);
336 vec_reset_length (s);
341 ip4_reass_free_ctx (ip4_reass_per_thread_t * rt, ip4_reass_t * reass)
343 pool_put (rt->pool, reass);
348 ip4_reass_free (vlib_main_t * vm, ip4_reass_main_t * rm,
349 ip4_reass_per_thread_t * rt, ip4_reass_t * reass)
351 clib_bihash_kv_16_8_t kv;
352 kv.key[0] = reass->key.as_u64[0];
353 kv.key[1] = reass->key.as_u64[1];
354 clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
355 return ip4_reass_free_ctx (rt, reass);
359 ip4_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
360 ip4_reass_main_t * rm, ip4_reass_t * reass)
362 u32 range_bi = reass->first_bi;
363 vlib_buffer_t *range_b;
364 vnet_buffer_opaque_t *range_vnb;
366 while (~0 != range_bi)
368 range_b = vlib_get_buffer (vm, range_bi);
369 range_vnb = vnet_buffer (range_b);
373 vec_add1 (to_free, bi);
374 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
375 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
378 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
385 range_bi = range_vnb->ip.reass.next_range_bi;
387 /* send to next_error_index */
388 if (~0 != reass->error_next_index)
390 u32 n_left_to_next, *to_next, next_index;
392 next_index = reass->error_next_index;
395 while (vec_len (to_free) > 0)
397 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
399 while (vec_len (to_free) > 0 && n_left_to_next > 0)
401 bi = vec_pop (to_free);
408 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
409 to_next, n_left_to_next,
413 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
418 vlib_buffer_free (vm, to_free, vec_len (to_free));
423 ip4_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
424 ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt,
425 ip4_reass_kv_t * kv, u8 * do_handoff)
433 now = vlib_time_now (vm);
434 if (!clib_bihash_search_16_8
435 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv))
438 pool_elt_at_index (rm->per_thread_data
439 [kv->v.memory_owner_thread_index].pool,
441 if (vm->thread_index != reass->memory_owner_thread_index)
447 if (now > reass->last_heard + rm->timeout)
449 ip4_reass_drop_all (vm, node, rm, reass);
450 ip4_reass_free (vm, rm, rt, reass);
457 reass->last_heard = now;
461 if (rt->reass_n >= rm->max_reass_n)
468 pool_get (rt->pool, reass);
469 clib_memset (reass, 0, sizeof (*reass));
470 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
471 reass->memory_owner_thread_index = vm->thread_index;
473 reass->first_bi = ~0;
474 reass->last_packet_octet = ~0;
476 reass->next_index = ~0;
477 reass->error_next_index = ~0;
481 reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0];
482 reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1];
483 kv->v.reass_index = (reass - rt->pool);
484 kv->v.memory_owner_thread_index = vm->thread_index;
485 reass->last_heard = now;
488 clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 2);
491 ip4_reass_free_ctx (rt, reass);
493 // if other worker created a context already work with the other copy
501 always_inline ip4_reass_rc_t
502 ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
503 ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt,
504 ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
507 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
508 vlib_buffer_t *last_b = NULL;
509 u32 sub_chain_bi = reass->first_bi;
510 u32 total_length = 0;
514 u32 tmp_bi = sub_chain_bi;
515 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
516 ip4_header_t *ip = vlib_buffer_get_current (tmp);
517 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
518 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
519 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
521 return IP4_REASS_RC_INTERNAL_ERROR;
524 u32 data_len = ip4_reass_buffer_get_data_len (tmp);
526 ip4_header_bytes (ip) + ip4_reass_buffer_get_data_offset (tmp);
528 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
529 if (tmp_bi == reass->first_bi)
531 /* first buffer - keep ip4 header */
532 if (0 != ip4_reass_buffer_get_data_offset (tmp))
534 return IP4_REASS_RC_INTERNAL_ERROR;
537 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
538 ip4_header_bytes (ip);
539 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
541 return IP4_REASS_RC_INTERNAL_ERROR;
545 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
551 if (trim_front > tmp->current_length)
553 /* drop whole buffer */
554 u32 to_be_freed_bi = tmp_bi;
555 trim_front -= tmp->current_length;
556 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
558 return IP4_REASS_RC_INTERNAL_ERROR;
560 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
561 tmp_bi = tmp->next_buffer;
562 tmp->next_buffer = 0;
563 tmp = vlib_get_buffer (vm, tmp_bi);
564 vlib_buffer_free_one (vm, to_be_freed_bi);
569 vlib_buffer_advance (tmp, trim_front);
577 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
578 last_b->next_buffer = tmp_bi;
581 if (keep_data <= tmp->current_length)
583 tmp->current_length = keep_data;
588 keep_data -= tmp->current_length;
589 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
591 return IP4_REASS_RC_INTERNAL_ERROR;
594 total_length += tmp->current_length;
595 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
597 tmp_bi = tmp->next_buffer;
598 tmp = vlib_get_buffer (vm, tmp->next_buffer);
607 u32 to_be_freed_bi = tmp_bi;
608 if (reass->first_bi == tmp_bi)
610 return IP4_REASS_RC_INTERNAL_ERROR;
612 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
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);
622 tmp->next_buffer = 0;
623 vlib_buffer_free_one (vm, to_be_freed_bi);
629 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
632 while (~0 != sub_chain_bi);
636 return IP4_REASS_RC_INTERNAL_ERROR;
638 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
640 if (total_length < first_b->current_length)
642 return IP4_REASS_RC_INTERNAL_ERROR;
644 total_length -= first_b->current_length;
645 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
646 first_b->total_length_not_including_first_buffer = total_length;
647 ip4_header_t *ip = vlib_buffer_get_current (first_b);
648 ip->flags_and_fragment_offset = 0;
649 ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
650 ip->checksum = ip4_header_checksum (ip);
651 if (!vlib_buffer_chain_linearize (vm, first_b))
653 return IP4_REASS_RC_NO_BUF;
655 // reset to reconstruct the mbuf linking
656 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
657 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
659 ip4_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter,
660 reass->first_bi, reass->first_bi, reass->data_len,
662 ++reass->trace_op_counter;
664 // following code does a hexdump of packet fragments to stdout ...
667 u32 bi = reass->first_bi;
671 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
672 s = format (s, "%u: %U\n", bi, format_hexdump,
673 vlib_buffer_get_current (b), b->current_length);
674 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
683 printf ("%.*s\n", vec_len (s), s);
690 *bi0 = reass->first_bi;
693 *next0 = IP4_REASSEMBLY_NEXT_INPUT;
697 *next0 = reass->next_index;
699 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
700 *error0 = IP4_ERROR_NONE;
701 ip4_reass_free (vm, rm, rt, reass);
703 return IP4_REASS_RC_OK;
706 always_inline ip4_reass_rc_t
707 ip4_reass_insert_range_in_chain (vlib_main_t * vm,
708 ip4_reass_main_t * rm,
709 ip4_reass_per_thread_t * rt,
711 u32 prev_range_bi, u32 new_next_bi)
713 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
714 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
715 if (~0 != prev_range_bi)
717 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
718 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
719 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
720 prev_vnb->ip.reass.next_range_bi = new_next_bi;
724 if (~0 != reass->first_bi)
726 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
728 reass->first_bi = new_next_bi;
730 vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
731 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
732 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
734 return IP4_REASS_RC_INTERNAL_ERROR;
736 reass->data_len += ip4_reass_buffer_get_data_len (new_next_b);
737 return IP4_REASS_RC_OK;
740 always_inline ip4_reass_rc_t
741 ip4_reass_remove_range_from_chain (vlib_main_t * vm,
742 vlib_node_runtime_t * node,
743 ip4_reass_main_t * rm,
744 ip4_reass_t * reass, u32 prev_range_bi,
747 vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
748 vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
749 if (~0 != prev_range_bi)
751 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
752 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
753 if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
755 return IP4_REASS_RC_INTERNAL_ERROR;
757 prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
761 reass->first_bi = discard_vnb->ip.reass.next_range_bi;
763 vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
764 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
765 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
767 return IP4_REASS_RC_INTERNAL_ERROR;
769 reass->data_len -= ip4_reass_buffer_get_data_len (discard_b);
772 u32 to_be_freed_bi = discard_bi;
773 if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
775 ip4_reass_add_trace (vm, node, rm, reass->id,
776 reass->trace_op_counter, discard_bi,
777 reass->first_bi, reass->data_len,
778 RANGE_DISCARD, 0, ~0);
779 ++reass->trace_op_counter;
781 if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
783 discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
784 discard_bi = discard_b->next_buffer;
785 discard_b->next_buffer = 0;
786 discard_b = vlib_get_buffer (vm, discard_bi);
787 vlib_buffer_free_one (vm, to_be_freed_bi);
791 discard_b->next_buffer = 0;
792 vlib_buffer_free_one (vm, to_be_freed_bi);
796 return IP4_REASS_RC_OK;
799 always_inline ip4_reass_rc_t
800 ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
801 ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt,
802 ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
803 bool is_custom_app, u32 * handoff_thread_idx)
805 ip4_reass_rc_t rc = IP4_REASS_RC_OK;
807 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
808 ip4_header_t *fip = vlib_buffer_get_current (fb);
809 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
812 // store (error_)next_index before it's overwritten
813 reass->next_index = fvnb->ip.reass.next_index;
814 reass->error_next_index = fvnb->ip.reass.error_next_index;
816 const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
817 const u32 fragment_length =
818 clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
819 const u32 fragment_last = fragment_first + fragment_length - 1;
820 fvnb->ip.reass.fragment_first = fragment_first;
821 fvnb->ip.reass.fragment_last = fragment_last;
822 int more_fragments = ip4_get_fragment_more (fip);
823 u32 candidate_range_bi = reass->first_bi;
824 u32 prev_range_bi = ~0;
825 fvnb->ip.reass.range_first = fragment_first;
826 fvnb->ip.reass.range_last = fragment_last;
827 fvnb->ip.reass.next_range_bi = ~0;
830 reass->last_packet_octet = fragment_last;
832 if (~0 == reass->first_bi)
834 // starting a new reassembly
836 ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
838 if (IP4_REASS_RC_OK != rc)
842 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
844 ip4_reass_add_trace (vm, node, rm, reass->id,
845 reass->trace_op_counter, *bi0, reass->first_bi,
846 reass->data_len, RANGE_NEW, 0, ~0);
847 ++reass->trace_op_counter;
850 reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
851 reass->fragments_n = 1;
852 return IP4_REASS_RC_OK;
854 reass->min_fragment_length = clib_min (clib_net_to_host_u16 (fip->length),
855 fvnb->ip.reass.estimated_mtu);
856 while (~0 != candidate_range_bi)
858 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
859 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
860 if (fragment_first > candidate_vnb->ip.reass.range_last)
862 // this fragments starts after candidate range
863 prev_range_bi = candidate_range_bi;
864 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
865 if (candidate_vnb->ip.reass.range_last < fragment_last &&
866 ~0 == candidate_range_bi)
868 // special case - this fragment falls beyond all known ranges
870 ip4_reass_insert_range_in_chain (vm, rm, rt, reass,
871 prev_range_bi, *bi0);
872 if (IP4_REASS_RC_OK != rc)
881 if (fragment_last < candidate_vnb->ip.reass.range_first)
883 // this fragment ends before candidate range without any overlap
885 ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
887 if (IP4_REASS_RC_OK != rc)
895 if (fragment_first >= candidate_vnb->ip.reass.range_first &&
896 fragment_last <= candidate_vnb->ip.reass.range_last)
898 // this fragment is a (sub)part of existing range, ignore it
899 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
901 ip4_reass_add_trace (vm, node, rm, reass->id,
902 reass->trace_op_counter, *bi0,
903 reass->first_bi, reass->data_len,
904 RANGE_OVERLAP, 0, ~0);
905 ++reass->trace_op_counter;
909 int discard_candidate = 0;
910 if (fragment_first < candidate_vnb->ip.reass.range_first)
913 fragment_last - candidate_vnb->ip.reass.range_first + 1;
914 if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
916 candidate_vnb->ip.reass.range_first += overlap;
917 if (reass->data_len < overlap)
919 return IP4_REASS_RC_INTERNAL_ERROR;
921 reass->data_len -= overlap;
922 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
924 ip4_reass_add_trace (vm, node, rm, reass->id,
925 reass->trace_op_counter,
927 reass->first_bi, reass->data_len,
928 RANGE_SHRINK, 0, ~0);
929 ++reass->trace_op_counter;
932 ip4_reass_insert_range_in_chain (vm, rm, rt, reass,
933 prev_range_bi, *bi0);
934 if (IP4_REASS_RC_OK != rc)
942 discard_candidate = 1;
945 else if (fragment_last > candidate_vnb->ip.reass.range_last)
948 candidate_vnb->ip.reass.range_last - fragment_first + 1;
949 if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
951 fvnb->ip.reass.range_first += overlap;
952 if (~0 != candidate_vnb->ip.reass.next_range_bi)
954 prev_range_bi = candidate_range_bi;
956 candidate_vnb->ip.reass.next_range_bi;
961 // special case - last range discarded
963 ip4_reass_insert_range_in_chain (vm, rm, rt, reass,
966 if (IP4_REASS_RC_OK != rc)
975 discard_candidate = 1;
980 discard_candidate = 1;
982 if (discard_candidate)
984 u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
985 // discard candidate range, probe next range
987 ip4_reass_remove_range_from_chain (vm, node, rm, reass,
990 if (IP4_REASS_RC_OK != rc)
994 if (~0 != next_range_bi)
996 candidate_range_bi = next_range_bi;
1001 // special case - last range discarded
1003 ip4_reass_insert_range_in_chain (vm, rm, rt, reass,
1004 prev_range_bi, *bi0);
1005 if (IP4_REASS_RC_OK != rc)
1015 ++reass->fragments_n;
1018 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1020 ip4_reass_add_trace (vm, node, rm, reass->id,
1021 reass->trace_op_counter, *bi0, reass->first_bi,
1022 reass->data_len, RANGE_NEW, 0, ~0);
1023 ++reass->trace_op_counter;
1026 if (~0 != reass->last_packet_octet &&
1027 reass->data_len == reass->last_packet_octet + 1)
1029 *handoff_thread_idx = reass->sendout_thread_index;
1031 ip4_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1033 if (IP4_REASS_RC_OK == rc
1034 && reass->memory_owner_thread_index != reass->sendout_thread_index)
1036 rc = IP4_REASS_RC_HANDOFF;
1044 if (reass->fragments_n > rm->max_reass_len)
1046 rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1051 *next0 = IP4_REASSEMBLY_NEXT_DROP;
1052 *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1059 ip4_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1060 vlib_frame_t * frame, bool is_feature,
1063 u32 *from = vlib_frame_vector_args (frame);
1064 u32 n_left_from, n_left_to_next, *to_next, next_index;
1065 ip4_reass_main_t *rm = &ip4_reass_main;
1066 ip4_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1067 clib_spinlock_lock (&rt->lock);
1069 n_left_from = frame->n_vectors;
1070 next_index = node->cached_next_index;
1071 while (n_left_from > 0)
1073 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1075 while (n_left_from > 0 && n_left_to_next > 0)
1080 u32 error0 = IP4_ERROR_NONE;
1083 b0 = vlib_get_buffer (vm, bi0);
1085 ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1086 if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1088 // this is a whole packet - no fragmentation
1091 next0 = IP4_REASSEMBLY_NEXT_INPUT;
1095 next0 = vnet_buffer (b0)->ip.reass.next_index;
1100 const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1101 const u32 fragment_length =
1102 clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1103 const u32 fragment_last = fragment_first + fragment_length - 1;
1104 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
1106 next0 = IP4_REASSEMBLY_NEXT_DROP;
1107 error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1115 (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1116 vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1117 (u64) ip0->src_address.as_u32 << 32;
1119 (u64) ip0->dst_address.as_u32 |
1120 (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1122 ip4_reass_t *reass =
1123 ip4_reass_find_or_create (vm, node, rm, rt, &kv,
1127 const u32 fragment_first =
1128 ip4_get_fragment_offset_bytes (ip0);
1129 if (0 == fragment_first)
1131 reass->sendout_thread_index = vm->thread_index;
1134 if (PREDICT_FALSE (do_handoff))
1136 next0 = IP4_REASSEMBLY_NEXT_HANDOFF;
1138 vnet_buffer (b0)->ip.
1139 reass.owner_feature_thread_index =
1140 kv.v.memory_owner_thread_index;
1142 vnet_buffer (b0)->ip.reass.owner_thread_index =
1143 kv.v.memory_owner_thread_index;
1147 u32 handoff_thread_idx;
1148 switch (ip4_reass_update
1149 (vm, node, rm, rt, reass, &bi0, &next0,
1150 &error0, is_custom_app, &handoff_thread_idx))
1152 case IP4_REASS_RC_OK:
1153 /* nothing to do here */
1155 case IP4_REASS_RC_HANDOFF:
1156 next0 = IP4_REASSEMBLY_NEXT_HANDOFF;
1157 b0 = vlib_get_buffer (vm, bi0);
1159 vnet_buffer (b0)->ip.
1160 reass.owner_feature_thread_index =
1163 vnet_buffer (b0)->ip.reass.owner_thread_index =
1166 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1167 vlib_node_increment_counter (vm, node->node_index,
1168 IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1170 ip4_reass_drop_all (vm, node, rm, reass);
1171 ip4_reass_free (vm, rm, rt, reass);
1174 case IP4_REASS_RC_NO_BUF:
1175 vlib_node_increment_counter (vm, node->node_index,
1176 IP4_ERROR_REASS_NO_BUF,
1178 ip4_reass_drop_all (vm, node, rm, reass);
1179 ip4_reass_free (vm, rm, rt, reass);
1182 case IP4_REASS_RC_INTERNAL_ERROR:
1183 /* drop everything and start with a clean slate */
1184 vlib_node_increment_counter (vm, node->node_index,
1185 IP4_ERROR_REASS_INTERNAL_ERROR,
1187 ip4_reass_drop_all (vm, node, rm, reass);
1188 ip4_reass_free (vm, rm, rt, reass);
1195 next0 = IP4_REASSEMBLY_NEXT_DROP;
1196 error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1200 b0->error = node->errors[error0];
1207 n_left_to_next -= 1;
1208 if (next0 == IP4_REASSEMBLY_NEXT_HANDOFF)
1210 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1213 ip4_reass_add_trace (vm, node, rm, ~0,
1215 bi0, ~0, ~0, HANDOFF, 0,
1216 vnet_buffer (b0)->ip.
1217 reass.owner_feature_thread_index);
1219 ip4_reass_add_trace (vm, node, rm, ~0, ~0, bi0,
1221 vnet_buffer (b0)->ip.
1222 reass.owner_thread_index);
1225 else if (is_feature && IP4_ERROR_NONE == error0)
1227 b0 = vlib_get_buffer (vm, bi0);
1228 vnet_feature_next (&next0, b0);
1230 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1231 to_next, n_left_to_next,
1233 IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1241 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1244 clib_spinlock_unlock (&rt->lock);
1245 return frame->n_vectors;
1248 static char *ip4_reassembly_error_strings[] = {
1249 #define _(sym, string) string,
1254 VLIB_NODE_FN (ip4_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1255 vlib_frame_t * frame)
1257 return ip4_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1258 false /* is_custom_app */ );
1262 VLIB_REGISTER_NODE (ip4_reass_node) = {
1263 .name = "ip4-reassembly",
1264 .vector_size = sizeof (u32),
1265 .format_trace = format_ip4_reass_trace,
1266 .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
1267 .error_strings = ip4_reassembly_error_strings,
1268 .n_next_nodes = IP4_REASSEMBLY_N_NEXT,
1271 [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input",
1272 [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop",
1273 [IP4_REASSEMBLY_NEXT_HANDOFF] = "ip4-reassembly-handoff",
1279 VLIB_NODE_FN (ip4_reass_node_feature) (vlib_main_t * vm,
1280 vlib_node_runtime_t * node,
1281 vlib_frame_t * frame)
1283 return ip4_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1284 false /* is_custom_app */ );
1288 VLIB_REGISTER_NODE (ip4_reass_node_feature) = {
1289 .name = "ip4-reassembly-feature",
1290 .vector_size = sizeof (u32),
1291 .format_trace = format_ip4_reass_trace,
1292 .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
1293 .error_strings = ip4_reassembly_error_strings,
1294 .n_next_nodes = IP4_REASSEMBLY_N_NEXT,
1297 [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input",
1298 [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop",
1299 [IP4_REASSEMBLY_NEXT_HANDOFF] = "ip4-reass-feature-hoff",
1305 VNET_FEATURE_INIT (ip4_reassembly_feature, static) = {
1306 .arc_name = "ip4-unicast",
1307 .node_name = "ip4-reassembly-feature",
1308 .runs_before = VNET_FEATURES ("ip4-lookup",
1309 "ipsec4-input-feature"),
1314 #ifndef CLIB_MARCH_VARIANT
1316 ip4_reass_get_nbuckets ()
1318 ip4_reass_main_t *rm = &ip4_reass_main;
1322 nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1324 for (i = 0; i < 31; i++)
1325 if ((1 << i) >= nbuckets)
1331 #endif /* CLIB_MARCH_VARIANT */
1335 IP4_EVENT_CONFIG_CHANGED = 1,
1336 } ip4_reass_event_t;
1341 clib_bihash_16_8_t *new_hash;
1342 } ip4_rehash_cb_ctx;
1344 #ifndef CLIB_MARCH_VARIANT
1346 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1348 ip4_rehash_cb_ctx *ctx = _ctx;
1349 if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1356 ip4_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1357 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1359 ip4_reass_main.timeout_ms = timeout_ms;
1360 ip4_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1361 ip4_reass_main.max_reass_n = max_reassemblies;
1362 ip4_reass_main.max_reass_len = max_reassembly_length;
1363 ip4_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1367 ip4_reass_set (u32 timeout_ms, u32 max_reassemblies,
1368 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1370 u32 old_nbuckets = ip4_reass_get_nbuckets ();
1371 ip4_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
1372 expire_walk_interval_ms);
1373 vlib_process_signal_event (ip4_reass_main.vlib_main,
1374 ip4_reass_main.ip4_reass_expire_node_idx,
1375 IP4_EVENT_CONFIG_CHANGED, 0);
1376 u32 new_nbuckets = ip4_reass_get_nbuckets ();
1377 if (ip4_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1379 clib_bihash_16_8_t new_hash;
1380 clib_memset (&new_hash, 0, sizeof (new_hash));
1381 ip4_rehash_cb_ctx ctx;
1383 ctx.new_hash = &new_hash;
1384 clib_bihash_init_16_8 (&new_hash, "ip4-reass", new_nbuckets,
1385 new_nbuckets * 1024);
1386 clib_bihash_foreach_key_value_pair_16_8 (&ip4_reass_main.hash,
1387 ip4_rehash_cb, &ctx);
1390 clib_bihash_free_16_8 (&new_hash);
1395 clib_bihash_free_16_8 (&ip4_reass_main.hash);
1396 clib_memcpy_fast (&ip4_reass_main.hash, &new_hash,
1397 sizeof (ip4_reass_main.hash));
1398 clib_bihash_copied (&ip4_reass_main.hash, &new_hash);
1405 ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1406 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
1408 *timeout_ms = ip4_reass_main.timeout_ms;
1409 *max_reassemblies = ip4_reass_main.max_reass_n;
1410 *max_reassembly_length = ip4_reass_main.max_reass_len;
1411 *expire_walk_interval_ms = ip4_reass_main.expire_walk_interval_ms;
1415 static clib_error_t *
1416 ip4_reass_init_function (vlib_main_t * vm)
1418 ip4_reass_main_t *rm = &ip4_reass_main;
1419 clib_error_t *error = 0;
1425 vec_validate (rm->per_thread_data, vlib_num_workers ());
1426 ip4_reass_per_thread_t *rt;
1427 vec_foreach (rt, rm->per_thread_data)
1429 clib_spinlock_init (&rt->lock);
1430 pool_alloc (rt->pool, rm->max_reass_n);
1433 node = vlib_get_node_by_name (vm, (u8 *) "ip4-reassembly-expire-walk");
1435 rm->ip4_reass_expire_node_idx = node->index;
1437 ip4_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1438 IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1439 IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1440 IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1442 nbuckets = ip4_reass_get_nbuckets ();
1443 clib_bihash_init_16_8 (&rm->hash, "ip4-reass", nbuckets, nbuckets * 1024);
1445 node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1447 rm->ip4_drop_idx = node->index;
1449 rm->fq_index = vlib_frame_queue_main_init (ip4_reass_node.index, 0);
1450 rm->fq_feature_index =
1451 vlib_frame_queue_main_init (ip4_reass_node_feature.index, 0);
1456 VLIB_INIT_FUNCTION (ip4_reass_init_function);
1457 #endif /* CLIB_MARCH_VARIANT */
1460 ip4_reass_walk_expired (vlib_main_t * vm,
1461 vlib_node_runtime_t * node, vlib_frame_t * f)
1463 ip4_reass_main_t *rm = &ip4_reass_main;
1464 uword event_type, *event_data = 0;
1468 vlib_process_wait_for_event_or_clock (vm,
1470 rm->expire_walk_interval_ms /
1471 (f64) MSEC_PER_SEC);
1472 event_type = vlib_process_get_events (vm, &event_data);
1476 case ~0: /* no events => timeout */
1477 /* nothing to do here */
1479 case IP4_EVENT_CONFIG_CHANGED:
1482 clib_warning ("BUG: event type 0x%wx", event_type);
1485 f64 now = vlib_time_now (vm);
1488 int *pool_indexes_to_free = NULL;
1490 uword thread_index = 0;
1492 const uword nthreads = vlib_num_workers () + 1;
1493 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1495 ip4_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1496 clib_spinlock_lock (&rt->lock);
1498 vec_reset_length (pool_indexes_to_free);
1500 pool_foreach_index (index, rt->pool, ({
1501 reass = pool_elt_at_index (rt->pool, index);
1502 if (now > reass->last_heard + rm->timeout)
1504 vec_add1 (pool_indexes_to_free, index);
1510 vec_foreach (i, pool_indexes_to_free)
1512 ip4_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1513 ip4_reass_drop_all (vm, node, rm, reass);
1514 ip4_reass_free (vm, rm, rt, reass);
1518 clib_spinlock_unlock (&rt->lock);
1521 vec_free (pool_indexes_to_free);
1524 _vec_len (event_data) = 0;
1532 VLIB_REGISTER_NODE (ip4_reass_expire_node, static) = {
1533 .function = ip4_reass_walk_expired,
1534 .type = VLIB_NODE_TYPE_PROCESS,
1535 .name = "ip4-reassembly-expire-walk",
1536 .format_trace = format_ip4_reass_trace,
1537 .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
1538 .error_strings = ip4_reassembly_error_strings,
1544 format_ip4_reass_key (u8 * s, va_list * args)
1546 ip4_reass_key_t *key = va_arg (*args, ip4_reass_key_t *);
1547 s = format (s, "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_reass_t *reass = va_arg (*args, ip4_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_reass_key, &reass->key, reass->first_bi,
1562 reass->data_len, reass->last_packet_octet,
1563 reass->trace_op_counter);
1564 u32 bi = reass->first_bi;
1568 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1569 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1570 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1571 "fragment[%u, %u]\n",
1572 counter, vnb->ip.reass.range_first,
1573 vnb->ip.reass.range_last, bi,
1574 ip4_reass_buffer_get_data_offset (b),
1575 ip4_reass_buffer_get_data_len (b),
1576 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1577 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1579 bi = b->next_buffer;
1589 static clib_error_t *
1590 show_ip4_reass (vlib_main_t * vm,
1591 unformat_input_t * input,
1592 CLIB_UNUSED (vlib_cli_command_t * lmd))
1594 ip4_reass_main_t *rm = &ip4_reass_main;
1596 vlib_cli_output (vm, "---------------------");
1597 vlib_cli_output (vm, "IP4 reassembly status");
1598 vlib_cli_output (vm, "---------------------");
1599 bool details = false;
1600 if (unformat (input, "details"))
1605 u32 sum_reass_n = 0;
1608 const uword nthreads = vlib_num_workers () + 1;
1609 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1611 ip4_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1612 clib_spinlock_lock (&rt->lock);
1616 pool_foreach (reass, rt->pool, {
1617 vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1621 sum_reass_n += rt->reass_n;
1622 clib_spinlock_unlock (&rt->lock);
1624 vlib_cli_output (vm, "---------------------");
1625 vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
1626 (long unsigned) sum_reass_n);
1627 vlib_cli_output (vm,
1628 "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n",
1629 (long unsigned) rm->max_reass_n);
1634 VLIB_CLI_COMMAND (show_ip4_reassembly_cmd, static) = {
1635 .path = "show ip4-reassembly",
1636 .short_help = "show ip4-reassembly [details]",
1637 .function = show_ip4_reass,
1641 #ifndef CLIB_MARCH_VARIANT
1643 ip4_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1645 return vnet_feature_enable_disable ("ip4-unicast",
1646 "ip4-reassembly-feature", sw_if_index,
1647 enable_disable, 0, 0);
1649 #endif /* CLIB_MARCH_VARIANT */
1652 #define foreach_ip4_reassembly_handoff_error \
1653 _(CONGESTION_DROP, "congestion drop")
1658 #define _(sym,str) IP4_REASSEMBLY_HANDOFF_ERROR_##sym,
1659 foreach_ip4_reassembly_handoff_error
1661 IP4_REASSEMBLY_HANDOFF_N_ERROR,
1662 } ip4_reassembly_handoff_error_t;
1664 static char *ip4_reassembly_handoff_error_strings[] = {
1665 #define _(sym,string) string,
1666 foreach_ip4_reassembly_handoff_error
1672 u32 next_worker_index;
1673 } ip4_reassembly_handoff_trace_t;
1676 format_ip4_reassembly_handoff_trace (u8 * s, va_list * args)
1678 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1679 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1680 ip4_reassembly_handoff_trace_t *t =
1681 va_arg (*args, ip4_reassembly_handoff_trace_t *);
1684 format (s, "ip4-reassembly-handoff: next-worker %d",
1685 t->next_worker_index);
1691 ip4_reassembly_handoff_node_inline (vlib_main_t * vm,
1692 vlib_node_runtime_t * node,
1693 vlib_frame_t * frame, bool is_feature)
1695 ip4_reass_main_t *rm = &ip4_reass_main;
1697 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1698 u32 n_enq, n_left_from, *from;
1699 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1702 from = vlib_frame_vector_args (frame);
1703 n_left_from = frame->n_vectors;
1704 vlib_get_buffers (vm, from, bufs, n_left_from);
1707 ti = thread_indices;
1709 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1711 while (n_left_from > 0)
1714 (is_feature) ? vnet_buffer (b[0])->ip.
1715 reass.owner_feature_thread_index : vnet_buffer (b[0])->ip.
1716 reass.owner_thread_index;
1719 ((node->flags & VLIB_NODE_FLAG_TRACE)
1720 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1722 ip4_reassembly_handoff_trace_t *t =
1723 vlib_add_trace (vm, node, b[0], sizeof (*t));
1724 t->next_worker_index = ti[0];
1732 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1733 frame->n_vectors, 1);
1735 if (n_enq < frame->n_vectors)
1736 vlib_node_increment_counter (vm, node->node_index,
1737 IP4_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1738 frame->n_vectors - n_enq);
1739 return frame->n_vectors;
1742 VLIB_NODE_FN (ip4_reassembly_handoff_node) (vlib_main_t * vm,
1743 vlib_node_runtime_t * node,
1744 vlib_frame_t * frame)
1746 return ip4_reassembly_handoff_node_inline (vm, node, frame,
1747 false /* is_feature */ );
1752 VLIB_REGISTER_NODE (ip4_reassembly_handoff_node) = {
1753 .name = "ip4-reassembly-handoff",
1754 .vector_size = sizeof (u32),
1755 .n_errors = ARRAY_LEN(ip4_reassembly_handoff_error_strings),
1756 .error_strings = ip4_reassembly_handoff_error_strings,
1757 .format_trace = format_ip4_reassembly_handoff_trace,
1769 VLIB_NODE_FN (ip4_reassembly_feature_handoff_node) (vlib_main_t * vm,
1770 vlib_node_runtime_t *
1772 vlib_frame_t * frame)
1774 return ip4_reassembly_handoff_node_inline (vm, node, frame,
1775 true /* is_feature */ );
1781 VLIB_REGISTER_NODE (ip4_reassembly_feature_handoff_node) = {
1782 .name = "ip4-reass-feature-hoff",
1783 .vector_size = sizeof (u32),
1784 .n_errors = ARRAY_LEN(ip4_reassembly_handoff_error_strings),
1785 .error_strings = ip4_reassembly_handoff_error_strings,
1786 .format_trace = format_ip4_reassembly_handoff_trace,
1797 * fd.io coding-style-patch-verification: ON
1800 * eval: (c-set-style "gnu")