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 IPv6 Full Reassembly.
20 * This file contains the source code for IPv6 full reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vppinfra/bihash_48_8.h>
27 #include <vnet/ip/reass/ip6_full_reass.h>
29 #define MSEC_PER_SEC 1000
30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
39 IP6_FULL_REASS_RC_INTERNAL_ERROR,
40 IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
41 IP6_FULL_REASS_RC_NO_BUF,
42 IP6_FULL_REASS_RC_HANDOFF,
43 } ip6_full_reass_rc_t;
60 } ip6_full_reass_key_t;
67 u32 memory_owner_thread_index;
70 } ip6_full_reass_val_t;
76 ip6_full_reass_key_t k;
77 ip6_full_reass_val_t v;
79 clib_bihash_kv_48_8_t kv;
80 } ip6_full_reass_kv_t;
84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
86 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
87 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
93 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
94 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
95 (vnb->ip.reass.fragment_first +
96 ip6_full_reass_buffer_get_data_offset (b)) + 1;
102 ip6_full_reass_key_t key;
103 // time when last packet was received
105 // internal id of this reassembly
107 // buffer index of first buffer in this reassembly context
109 // last octet of packet, ~0 until fragment without more_fragments arrives
110 u32 last_packet_octet;
111 // length of data collected so far
113 // trace operation counter
114 u32 trace_op_counter;
115 // next index - used by custom apps (~0 if not set)
117 // error next index - used by custom apps (~0 if not set)
118 u32 error_next_index;
119 // minimum fragment length for this reassembly - used to estimate MTU
120 u16 min_fragment_length;
121 // number of fragments for this reassembly
123 // thread owning memory for this context (whose pool contains this ctx)
124 u32 memory_owner_thread_index;
125 // thread which received fragment with offset 0 and which sends out the
126 // completed reassembly
127 u32 sendout_thread_index;
132 ip6_full_reass_t *pool;
135 clib_spinlock_t lock;
136 } ip6_full_reass_per_thread_t;
143 u32 expire_walk_interval_ms;
144 // maximum number of fragments in one reassembly
146 // maximum number of reassemblies
150 clib_bihash_48_8_t hash;
153 ip6_full_reass_per_thread_t *per_thread_data;
156 vlib_main_t *vlib_main;
158 // node index of ip6-drop node
160 u32 ip6_icmp_error_idx;
161 u32 ip6_full_reass_expire_node_idx;
163 /** Worker handoff */
165 u32 fq_feature_index;
167 // reference count for enabling/disabling feature - per interface
168 u32 *feature_use_refcount_per_intf;
169 } ip6_full_reass_main_t;
171 extern ip6_full_reass_main_t ip6_full_reass_main;
173 #ifndef CLIB_MARCH_VARIANT
174 ip6_full_reass_main_t ip6_full_reass_main;
175 #endif /* CLIB_MARCH_VARIANT */
179 IP6_FULL_REASSEMBLY_NEXT_INPUT,
180 IP6_FULL_REASSEMBLY_NEXT_DROP,
181 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
182 IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
183 IP6_FULL_REASSEMBLY_N_NEXT,
184 } ip6_full_reass_next_t;
190 ICMP_ERROR_RT_EXCEEDED,
191 ICMP_ERROR_FL_TOO_BIG,
192 ICMP_ERROR_FL_NOT_MULT_8,
195 } ip6_full_reass_trace_operation_e;
205 } ip6_full_reass_range_trace_t;
209 ip6_full_reass_trace_operation_e action;
211 ip6_full_reass_range_trace_t trace_range;
218 bool is_after_handoff;
219 ip6_header_t ip6_header;
220 ip6_frag_hdr_t ip6_frag_header;
221 } ip6_full_reass_trace_t;
224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
225 ip6_full_reass_range_trace_t * trace)
227 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
228 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
229 trace->range_first = vnb->ip.reass.range_first;
230 trace->range_last = vnb->ip.reass.range_last;
231 trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
232 trace->data_len = ip6_full_reass_buffer_get_data_len (b);
233 trace->range_bi = bi;
237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
239 ip6_full_reass_range_trace_t *trace =
240 va_arg (*args, ip6_full_reass_range_trace_t *);
242 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
243 trace->range_last, trace->data_offset, trace->data_len,
249 format_ip6_full_reass_trace (u8 * s, va_list * args)
251 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
252 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
253 ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
255 if (~0 != t->reass_id)
257 if (t->is_after_handoff)
260 format (s, "%U\n", format_ip6_header, &t->ip6_header,
261 sizeof (t->ip6_header));
263 format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
264 sizeof (t->ip6_frag_header));
268 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
269 t->reass_id, t->op_id);
270 indent = format_get_indent (s);
271 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
272 t->trace_range.first_bi, t->total_data_len,
273 t->fragment_first, t->fragment_last);
278 s = format (s, "\n%Unew %U", format_white_space, indent,
279 format_ip6_full_reass_range_trace, &t->trace_range);
282 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
283 format_ip6_full_reass_range_trace, &t->trace_range);
285 case ICMP_ERROR_FL_TOO_BIG:
286 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
287 format_white_space, indent,
288 format_ip6_full_reass_range_trace, &t->trace_range);
290 case ICMP_ERROR_FL_NOT_MULT_8:
291 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
292 format_white_space, indent,
293 format_ip6_full_reass_range_trace, &t->trace_range);
295 case ICMP_ERROR_RT_EXCEEDED:
296 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
297 format_white_space, indent);
300 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
304 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
313 ip6_full_reass_main_t * rm,
314 ip6_full_reass_t * reass, u32 bi,
315 ip6_frag_hdr_t * ip6_frag_header,
316 ip6_full_reass_trace_operation_e action,
319 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
320 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
321 bool is_after_handoff = false;
322 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
324 is_after_handoff = true;
326 ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
327 t->is_after_handoff = is_after_handoff;
328 if (t->is_after_handoff)
330 clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
331 clib_min (sizeof (t->ip6_header), b->current_length));
334 clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
335 sizeof (t->ip6_frag_header));
339 clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
344 t->reass_id = reass->id;
345 t->op_id = reass->trace_op_counter;
346 t->trace_range.first_bi = reass->first_bi;
347 t->total_data_len = reass->data_len;
348 ++reass->trace_op_counter;
355 t->thread_id = vm->thread_index;
356 t->thread_id_to = thread_id_to;
357 ip6_full_reass_trace_details (vm, bi, &t->trace_range);
358 t->fragment_first = vnb->ip.reass.fragment_first;
359 t->fragment_last = vnb->ip.reass.fragment_last;
362 s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
363 printf ("%.*s\n", vec_len (s), s);
365 vec_reset_length (s);
370 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
371 ip6_full_reass_t * reass)
373 pool_put (rt->pool, reass);
378 ip6_full_reass_free (ip6_full_reass_main_t * rm,
379 ip6_full_reass_per_thread_t * rt,
380 ip6_full_reass_t * reass)
382 clib_bihash_kv_48_8_t kv;
383 kv.key[0] = reass->key.as_u64[0];
384 kv.key[1] = reass->key.as_u64[1];
385 kv.key[2] = reass->key.as_u64[2];
386 kv.key[3] = reass->key.as_u64[3];
387 kv.key[4] = reass->key.as_u64[4];
388 kv.key[5] = reass->key.as_u64[5];
389 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
390 ip6_full_reass_free_ctx (rt, reass);
394 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
395 ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
397 u32 range_bi = reass->first_bi;
398 vlib_buffer_t *range_b;
399 vnet_buffer_opaque_t *range_vnb;
401 while (~0 != range_bi)
403 range_b = vlib_get_buffer (vm, range_bi);
404 range_vnb = vnet_buffer (range_b);
408 vec_add1 (to_free, bi);
409 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
410 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
413 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
420 range_bi = range_vnb->ip.reass.next_range_bi;
422 /* send to next_error_index */
423 if (~0 != reass->error_next_index)
425 u32 n_left_to_next, *to_next, next_index;
427 next_index = reass->error_next_index;
430 while (vec_len (to_free) > 0)
432 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
434 while (vec_len (to_free) > 0 && n_left_to_next > 0)
436 bi = vec_pop (to_free);
445 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
450 vlib_buffer_free (vm, to_free, vec_len (to_free));
456 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
457 ip6_full_reass_main_t * rm,
458 ip6_full_reass_t * reass, u32 * icmp_bi)
460 if (~0 == reass->first_bi)
464 if (~0 == reass->next_index) // custom apps don't want icmp
466 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
467 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
469 *icmp_bi = reass->first_bi;
470 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
472 ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
473 NULL, ICMP_ERROR_RT_EXCEEDED, ~0);
475 // fragment with offset zero received - send icmp message back
476 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
478 // separate first buffer from chain and steer it towards icmp node
479 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
480 reass->first_bi = b->next_buffer;
484 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
486 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
487 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
491 ip6_full_reass_drop_all (vm, node, rm, reass);
494 always_inline ip6_full_reass_t *
495 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
496 ip6_full_reass_main_t * rm,
497 ip6_full_reass_per_thread_t * rt,
498 ip6_full_reass_kv_t * kv, u32 * icmp_bi,
501 ip6_full_reass_t *reass;
507 now = vlib_time_now (vm);
509 if (!clib_bihash_search_48_8
510 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
513 pool_elt_at_index (rm->per_thread_data
514 [kv->v.memory_owner_thread_index].pool,
516 if (vm->thread_index != kv->v.memory_owner_thread_index)
522 if (now > reass->last_heard + rm->timeout)
524 ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
525 ip6_full_reass_free (rm, rt, reass);
532 reass->last_heard = now;
536 if (rt->reass_n >= rm->max_reass_n)
543 pool_get (rt->pool, reass);
544 clib_memset (reass, 0, sizeof (*reass));
545 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
547 reass->first_bi = ~0;
548 reass->last_packet_octet = ~0;
550 reass->next_index = ~0;
551 reass->error_next_index = ~0;
555 reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
556 reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
557 reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
558 reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
559 reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
560 reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
561 kv->v.reass_index = (reass - rt->pool);
562 kv->v.memory_owner_thread_index = vm->thread_index;
563 reass->last_heard = now;
566 clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
569 ip6_full_reass_free (rm, rt, reass);
571 // if other worker created a context already work with the other copy
579 always_inline ip6_full_reass_rc_t
580 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
581 ip6_full_reass_main_t * rm,
582 ip6_full_reass_per_thread_t * rt,
583 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
584 u32 * error0, bool is_custom_app)
586 *bi0 = reass->first_bi;
587 *error0 = IP6_ERROR_NONE;
588 ip6_frag_hdr_t *frag_hdr;
589 vlib_buffer_t *last_b = NULL;
590 u32 sub_chain_bi = reass->first_bi;
591 u32 total_length = 0;
594 u32 *vec_drop_compress = NULL;
595 ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
598 u32 tmp_bi = sub_chain_bi;
599 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
600 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
601 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
602 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
604 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
605 goto free_buffers_and_return;
608 u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
609 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
610 sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
612 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
613 if (tmp_bi == reass->first_bi)
615 /* first buffer - keep ip6 header */
616 if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
618 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
619 goto free_buffers_and_return;
622 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
623 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
625 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
627 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
628 goto free_buffers_and_return;
632 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
638 if (trim_front > tmp->current_length)
640 /* drop whole buffer */
641 vec_add1 (vec_drop_compress, tmp_bi);
642 trim_front -= tmp->current_length;
643 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
645 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
646 goto free_buffers_and_return;
648 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
649 tmp_bi = tmp->next_buffer;
650 tmp = vlib_get_buffer (vm, tmp_bi);
655 vlib_buffer_advance (tmp, trim_front);
663 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
664 last_b->next_buffer = tmp_bi;
667 if (keep_data <= tmp->current_length)
669 tmp->current_length = keep_data;
674 keep_data -= tmp->current_length;
675 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
677 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
678 goto free_buffers_and_return;
681 total_length += tmp->current_length;
685 vec_add1 (vec_drop_compress, tmp_bi);
686 if (reass->first_bi == tmp_bi)
688 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
689 goto free_buffers_and_return;
693 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
695 tmp_bi = tmp->next_buffer;
696 tmp = vlib_get_buffer (vm, tmp->next_buffer);
704 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
707 while (~0 != sub_chain_bi);
711 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
712 goto free_buffers_and_return;
714 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
715 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
716 if (total_length < first_b->current_length)
718 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
719 goto free_buffers_and_return;
721 total_length -= first_b->current_length;
722 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
723 first_b->total_length_not_including_first_buffer = total_length;
724 // drop fragment header
725 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
726 ip6_header_t *ip = vlib_buffer_get_current (first_b);
727 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
728 ip6_ext_header_t *prev_hdr;
730 ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
734 prev_hdr->next_hdr = frag_hdr->next_hdr;
738 ip->protocol = frag_hdr->next_hdr;
740 if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
742 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
743 goto free_buffers_and_return;
745 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
746 first_b->current_length - ip6_frag_hdr_offset -
747 sizeof (ip6_frag_hdr_t));
748 first_b->current_length -= sizeof (*frag_hdr);
750 clib_host_to_net_u16 (total_length + first_b->current_length -
752 if (!vlib_buffer_chain_linearize (vm, first_b))
754 rv = IP6_FULL_REASS_RC_NO_BUF;
755 goto free_buffers_and_return;
757 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
758 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
760 ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, NULL,
763 // following code does a hexdump of packet fragments to stdout ...
766 u32 bi = reass->first_bi;
770 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
771 s = format (s, "%u: %U\n", bi, format_hexdump,
772 vlib_buffer_get_current (b), b->current_length);
773 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
782 printf ("%.*s\n", vec_len (s), s);
791 *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
795 *next0 = reass->next_index;
797 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
798 ip6_full_reass_free (rm, rt, reass);
800 free_buffers_and_return:
801 vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
802 vec_free (vec_drop_compress);
807 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
808 ip6_full_reass_main_t * rm,
809 ip6_full_reass_per_thread_t * rt,
810 ip6_full_reass_t * reass,
811 u32 prev_range_bi, u32 new_next_bi)
814 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
815 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
816 if (~0 != prev_range_bi)
818 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
819 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
820 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
821 prev_vnb->ip.reass.next_range_bi = new_next_bi;
825 if (~0 != reass->first_bi)
827 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
829 reass->first_bi = new_next_bi;
831 reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
834 always_inline ip6_full_reass_rc_t
835 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
836 ip6_full_reass_main_t * rm,
837 ip6_full_reass_per_thread_t * rt,
838 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
839 u32 * error0, ip6_frag_hdr_t * frag_hdr,
840 bool is_custom_app, u32 * handoff_thread_idx)
843 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
844 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
847 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
848 reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
851 fvnb->ip.reass.ip6_frag_hdr_offset =
852 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
853 ip6_header_t *fip = vlib_buffer_get_current (fb);
854 if (fb->current_length < sizeof (*fip) ||
855 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
856 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
858 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
861 u32 fragment_first = fvnb->ip.reass.fragment_first =
862 ip6_frag_hdr_offset_bytes (frag_hdr);
863 u32 fragment_length =
864 vlib_buffer_length_in_chain (vm, fb) -
865 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
866 u32 fragment_last = fvnb->ip.reass.fragment_last =
867 fragment_first + fragment_length - 1;
868 int more_fragments = ip6_frag_hdr_more (frag_hdr);
869 u32 candidate_range_bi = reass->first_bi;
870 u32 prev_range_bi = ~0;
871 fvnb->ip.reass.range_first = fragment_first;
872 fvnb->ip.reass.range_last = fragment_last;
873 fvnb->ip.reass.next_range_bi = ~0;
876 reass->last_packet_octet = fragment_last;
878 if (~0 == reass->first_bi)
880 // starting a new reassembly
881 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
883 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
885 reass->fragments_n = 1;
886 goto check_if_done_maybe;
888 reass->min_fragment_length =
889 clib_min (clib_net_to_host_u16 (fip->payload_length),
890 fvnb->ip.reass.estimated_mtu);
891 while (~0 != candidate_range_bi)
893 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
894 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
895 if (fragment_first > candidate_vnb->ip.reass.range_last)
897 // this fragments starts after candidate range
898 prev_range_bi = candidate_range_bi;
899 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
900 if (candidate_vnb->ip.reass.range_last < fragment_last &&
901 ~0 == candidate_range_bi)
903 // special case - this fragment falls beyond all known ranges
904 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
905 prev_range_bi, *bi0);
911 if (fragment_last < candidate_vnb->ip.reass.range_first)
913 // this fragment ends before candidate range without any overlap
914 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
915 prev_range_bi, *bi0);
918 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
919 fragment_last == candidate_vnb->ip.reass.range_last)
921 // duplicate fragment - ignore
925 // overlapping fragment - not allowed by RFC 8200
926 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
928 ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
931 ip6_full_reass_drop_all (vm, node, rm, reass);
932 ip6_full_reass_free (rm, rt, reass);
933 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
934 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
935 return IP6_FULL_REASS_RC_OK;
939 ++reass->fragments_n;
943 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
945 ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
949 if (~0 != reass->last_packet_octet &&
950 reass->data_len == reass->last_packet_octet + 1)
952 *handoff_thread_idx = reass->sendout_thread_index;
954 reass->memory_owner_thread_index != reass->sendout_thread_index;
955 ip6_full_reass_rc_t rc =
956 ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
958 if (IP6_FULL_REASS_RC_OK == rc && handoff)
960 return IP6_FULL_REASS_RC_HANDOFF;
969 if (reass->fragments_n > rm->max_reass_len)
971 return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
976 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
977 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
980 return IP6_FULL_REASS_RC_OK;
984 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
986 ip6_frag_hdr_t * frag_hdr)
988 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
989 while (ip6_ext_hdr (tmp->next_hdr))
991 tmp = ip6_ext_next_header (tmp);
993 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
995 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
996 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
998 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1006 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1007 vlib_node_runtime_t * node,
1009 ip6_frag_hdr_t * frag_hdr)
1011 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1012 ip6_header_t *ip = vlib_buffer_get_current (b);
1013 int more_fragments = ip6_frag_hdr_more (frag_hdr);
1014 u32 fragment_length =
1015 vlib_buffer_length_in_chain (vm, b) -
1016 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1017 if (more_fragments && 0 != fragment_length % 8)
1019 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1020 ICMP6_parameter_problem_erroneous_header_field,
1021 (u8 *) & ip->payload_length - (u8 *) ip);
1028 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1029 vlib_node_runtime_t * node,
1031 ip6_frag_hdr_t * frag_hdr)
1033 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1034 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1035 u32 fragment_length =
1036 vlib_buffer_length_in_chain (vm, b) -
1037 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1038 if (fragment_first + fragment_length > 65535)
1040 ip6_header_t *ip0 = vlib_buffer_get_current (b);
1041 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1042 ICMP6_parameter_problem_erroneous_header_field,
1043 (u8 *) & frag_hdr->fragment_offset_and_more
1051 ip6_full_reassembly_inline (vlib_main_t * vm,
1052 vlib_node_runtime_t * node,
1053 vlib_frame_t * frame, bool is_feature,
1056 u32 *from = vlib_frame_vector_args (frame);
1057 u32 n_left_from, n_left_to_next, *to_next, next_index;
1058 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1059 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1060 clib_spinlock_lock (&rt->lock);
1062 n_left_from = frame->n_vectors;
1063 next_index = node->cached_next_index;
1064 while (n_left_from > 0)
1066 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1068 while (n_left_from > 0 && n_left_to_next > 0)
1072 u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1073 u32 error0 = IP6_ERROR_NONE;
1077 b0 = vlib_get_buffer (vm, bi0);
1079 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1080 ip6_frag_hdr_t *frag_hdr = NULL;
1081 ip6_ext_header_t *prev_hdr;
1082 if (ip6_ext_hdr (ip0->protocol))
1085 ip6_ext_header_find (vm, b0, ip0,
1086 IP_PROTOCOL_IPV6_FRAGMENTATION,
1091 // this is a regular packet - no fragmentation
1092 next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1095 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1096 (u8 *) frag_hdr - (u8 *) ip0;
1098 if (0 == ip6_frag_hdr_offset (frag_hdr))
1100 // first fragment - verify upper-layer is present
1101 if (!ip6_full_reass_verify_upper_layer_present
1102 (node, b0, frag_hdr))
1104 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1108 if (!ip6_full_reass_verify_fragment_multiple_8
1109 (vm, node, b0, frag_hdr)
1110 || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1113 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1116 ip6_full_reass_kv_t kv;
1119 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1120 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1121 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1122 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1124 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1125 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1126 (u64) frag_hdr->identification;
1127 kv.k.as_u64[5] = ip0->protocol;
1129 ip6_full_reass_t *reass =
1130 ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1135 const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1136 if (0 == fragment_first)
1138 reass->sendout_thread_index = vm->thread_index;
1141 if (PREDICT_FALSE (do_handoff))
1143 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1144 vnet_buffer (b0)->ip.reass.owner_thread_index =
1145 kv.v.memory_owner_thread_index;
1149 u32 handoff_thread_idx;
1150 switch (ip6_full_reass_update
1151 (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1152 frag_hdr, is_custom_app, &handoff_thread_idx))
1154 case IP6_FULL_REASS_RC_OK:
1155 /* nothing to do here */
1157 case IP6_FULL_REASS_RC_HANDOFF:
1158 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1159 b0 = vlib_get_buffer (vm, bi0);
1160 vnet_buffer (b0)->ip.reass.owner_thread_index =
1163 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1164 vlib_node_increment_counter (vm, node->node_index,
1165 IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1167 ip6_full_reass_drop_all (vm, node, rm, reass);
1168 ip6_full_reass_free (rm, rt, reass);
1171 case IP6_FULL_REASS_RC_NO_BUF:
1172 vlib_node_increment_counter (vm, node->node_index,
1173 IP6_ERROR_REASS_NO_BUF, 1);
1174 ip6_full_reass_drop_all (vm, node, rm, reass);
1175 ip6_full_reass_free (rm, rt, reass);
1178 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1179 vlib_node_increment_counter (vm, node->node_index,
1180 IP6_ERROR_REASS_INTERNAL_ERROR,
1182 ip6_full_reass_drop_all (vm, node, rm, reass);
1183 ip6_full_reass_free (rm, rt, reass);
1192 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1196 vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1197 next0 = fvnb->ip.reass.error_next_index;
1199 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1207 n_left_to_next -= 1;
1209 /* bi0 might have been updated by reass_finalize, reload */
1210 b0 = vlib_get_buffer (vm, bi0);
1211 b0->error = node->errors[error0];
1213 if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1215 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1217 ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1219 vnet_buffer (b0)->ip.
1220 reass.owner_thread_index);
1223 else if (is_feature && IP6_ERROR_NONE == error0)
1225 vnet_feature_next (&next0, b0);
1227 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1228 n_left_to_next, bi0, next0);
1233 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1234 to_next[0] = icmp_bi;
1236 n_left_to_next -= 1;
1237 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1238 n_left_to_next, icmp_bi,
1246 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1249 clib_spinlock_unlock (&rt->lock);
1250 return frame->n_vectors;
1253 static char *ip6_full_reassembly_error_strings[] = {
1254 #define _(sym, string) string,
1259 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1260 vlib_node_runtime_t * node,
1261 vlib_frame_t * frame)
1263 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1264 false /* is_custom_app */ );
1268 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1269 .name = "ip6-full-reassembly",
1270 .vector_size = sizeof (u32),
1271 .format_trace = format_ip6_full_reass_trace,
1272 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1273 .error_strings = ip6_full_reassembly_error_strings,
1274 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1277 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1278 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1279 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1280 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1285 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1286 vlib_node_runtime_t * node,
1287 vlib_frame_t * frame)
1289 return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1290 false /* is_custom_app */ );
1294 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1295 .name = "ip6-full-reassembly-feature",
1296 .vector_size = sizeof (u32),
1297 .format_trace = format_ip6_full_reass_trace,
1298 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1299 .error_strings = ip6_full_reassembly_error_strings,
1300 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1303 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1304 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1305 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1306 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1312 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1313 .arc_name = "ip6-unicast",
1314 .node_name = "ip6-full-reassembly-feature",
1315 .runs_before = VNET_FEATURES ("ip6-lookup",
1316 "ipsec6-input-feature"),
1321 #ifndef CLIB_MARCH_VARIANT
1323 ip6_full_reass_get_nbuckets ()
1325 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1329 nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1331 for (i = 0; i < 31; i++)
1332 if ((1 << i) >= nbuckets)
1338 #endif /* CLIB_MARCH_VARIANT */
1342 IP6_EVENT_CONFIG_CHANGED = 1,
1343 } ip6_full_reass_event_t;
1345 #ifndef CLIB_MARCH_VARIANT
1349 clib_bihash_48_8_t *new_hash;
1350 } ip6_rehash_cb_ctx;
1353 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1355 ip6_rehash_cb_ctx *ctx = _ctx;
1356 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1360 return (BIHASH_WALK_CONTINUE);
1364 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1365 u32 max_reassembly_length,
1366 u32 expire_walk_interval_ms)
1368 ip6_full_reass_main.timeout_ms = timeout_ms;
1369 ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1370 ip6_full_reass_main.max_reass_n = max_reassemblies;
1371 ip6_full_reass_main.max_reass_len = max_reassembly_length;
1372 ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1376 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1377 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1379 u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1380 ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1381 max_reassembly_length, expire_walk_interval_ms);
1382 vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1383 ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1384 IP6_EVENT_CONFIG_CHANGED, 0);
1385 u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1386 if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1388 clib_bihash_48_8_t new_hash;
1389 clib_memset (&new_hash, 0, sizeof (new_hash));
1390 ip6_rehash_cb_ctx ctx;
1392 ctx.new_hash = &new_hash;
1393 clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1394 new_nbuckets * 1024);
1395 clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1396 ip6_rehash_cb, &ctx);
1399 clib_bihash_free_48_8 (&new_hash);
1404 clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1405 clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1406 sizeof (ip6_full_reass_main.hash));
1407 clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1414 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1415 u32 * max_reassembly_length,
1416 u32 * expire_walk_interval_ms)
1418 *timeout_ms = ip6_full_reass_main.timeout_ms;
1419 *max_reassemblies = ip6_full_reass_main.max_reass_n;
1420 *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1421 *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1425 static clib_error_t *
1426 ip6_full_reass_init_function (vlib_main_t * vm)
1428 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1429 clib_error_t *error = 0;
1435 vec_validate (rm->per_thread_data, vlib_num_workers ());
1436 ip6_full_reass_per_thread_t *rt;
1437 vec_foreach (rt, rm->per_thread_data)
1439 clib_spinlock_init (&rt->lock);
1440 pool_alloc (rt->pool, rm->max_reass_n);
1443 node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1445 rm->ip6_full_reass_expire_node_idx = node->index;
1447 ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1448 IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1449 IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1450 IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1452 nbuckets = ip6_full_reass_get_nbuckets ();
1453 clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1456 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1458 rm->ip6_drop_idx = node->index;
1459 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1461 rm->ip6_icmp_error_idx = node->index;
1463 if ((error = vlib_call_init_function (vm, ip_main_init)))
1465 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1466 ip6_full_reass_node.index);
1468 rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1469 rm->fq_feature_index =
1470 vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1472 rm->feature_use_refcount_per_intf = NULL;
1476 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1477 #endif /* CLIB_MARCH_VARIANT */
1480 ip6_full_reass_walk_expired (vlib_main_t * vm,
1481 vlib_node_runtime_t * node, vlib_frame_t * f)
1483 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1484 uword event_type, *event_data = 0;
1488 vlib_process_wait_for_event_or_clock (vm,
1489 (f64) rm->expire_walk_interval_ms
1490 / (f64) MSEC_PER_SEC);
1491 event_type = vlib_process_get_events (vm, &event_data);
1495 case ~0: /* no events => timeout */
1496 /* nothing to do here */
1498 case IP6_EVENT_CONFIG_CHANGED:
1501 clib_warning ("BUG: event type 0x%wx", event_type);
1504 f64 now = vlib_time_now (vm);
1506 ip6_full_reass_t *reass;
1507 int *pool_indexes_to_free = NULL;
1509 uword thread_index = 0;
1511 const uword nthreads = vlib_num_workers () + 1;
1512 u32 *vec_icmp_bi = NULL;
1513 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1515 ip6_full_reass_per_thread_t *rt =
1516 &rm->per_thread_data[thread_index];
1517 clib_spinlock_lock (&rt->lock);
1519 vec_reset_length (pool_indexes_to_free);
1521 pool_foreach_index (index, rt->pool, ({
1522 reass = pool_elt_at_index (rt->pool, index);
1523 if (now > reass->last_heard + rm->timeout)
1525 vec_add1 (pool_indexes_to_free, index);
1531 vec_foreach (i, pool_indexes_to_free)
1533 ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1535 ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1537 vec_add1 (vec_icmp_bi, icmp_bi);
1539 ip6_full_reass_free (rm, rt, reass);
1543 clib_spinlock_unlock (&rt->lock);
1546 while (vec_len (vec_icmp_bi) > 0)
1549 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1550 u32 *to_next = vlib_frame_vector_args (f);
1551 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1552 int trace_frame = 0;
1553 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1555 u32 bi = vec_pop (vec_icmp_bi);
1556 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1557 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1559 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1563 n_left_to_next -= 1;
1565 f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1566 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1569 vec_free (pool_indexes_to_free);
1570 vec_free (vec_icmp_bi);
1573 _vec_len (event_data) = 0;
1581 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1582 .function = ip6_full_reass_walk_expired,
1583 .format_trace = format_ip6_full_reass_trace,
1584 .type = VLIB_NODE_TYPE_PROCESS,
1585 .name = "ip6-full-reassembly-expire-walk",
1587 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1588 .error_strings = ip6_full_reassembly_error_strings,
1594 format_ip6_full_reass_key (u8 * s, va_list * args)
1596 ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1597 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1598 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1599 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1604 format_ip6_full_reass (u8 * s, va_list * args)
1606 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1607 ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1609 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1610 "last_packet_octet: %u, trace_op_counter: %u\n",
1611 reass->id, format_ip6_full_reass_key, &reass->key,
1612 reass->first_bi, reass->data_len, reass->last_packet_octet,
1613 reass->trace_op_counter);
1614 u32 bi = reass->first_bi;
1618 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1619 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1620 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1621 "fragment[%u, %u]\n",
1622 counter, vnb->ip.reass.range_first,
1623 vnb->ip.reass.range_last, bi,
1624 ip6_full_reass_buffer_get_data_offset (b),
1625 ip6_full_reass_buffer_get_data_len (b),
1626 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1627 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1629 bi = b->next_buffer;
1639 static clib_error_t *
1640 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1641 CLIB_UNUSED (vlib_cli_command_t * lmd))
1643 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1645 vlib_cli_output (vm, "---------------------");
1646 vlib_cli_output (vm, "IP6 reassembly status");
1647 vlib_cli_output (vm, "---------------------");
1648 bool details = false;
1649 if (unformat (input, "details"))
1654 u32 sum_reass_n = 0;
1655 u64 sum_buffers_n = 0;
1656 ip6_full_reass_t *reass;
1658 const uword nthreads = vlib_num_workers () + 1;
1659 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1661 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1662 clib_spinlock_lock (&rt->lock);
1666 pool_foreach (reass, rt->pool, {
1667 vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1671 sum_reass_n += rt->reass_n;
1672 clib_spinlock_unlock (&rt->lock);
1674 vlib_cli_output (vm, "---------------------");
1675 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1676 (long unsigned) sum_reass_n);
1677 vlib_cli_output (vm,
1678 "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1679 (long unsigned) rm->max_reass_n);
1680 vlib_cli_output (vm,
1681 "Maximum configured full IP6 reassembly timeout: %lums\n",
1682 (long unsigned) rm->timeout_ms);
1683 vlib_cli_output (vm,
1684 "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1685 (long unsigned) rm->expire_walk_interval_ms);
1686 vlib_cli_output (vm, "Buffers in use: %lu\n",
1687 (long unsigned) sum_buffers_n);
1692 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1693 .path = "show ip6-full-reassembly",
1694 .short_help = "show ip6-full-reassembly [details]",
1695 .function = show_ip6_full_reass,
1699 #ifndef CLIB_MARCH_VARIANT
1701 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1703 return vnet_feature_enable_disable ("ip6-unicast",
1704 "ip6-full-reassembly-feature",
1705 sw_if_index, enable_disable, 0, 0);
1707 #endif /* CLIB_MARCH_VARIANT */
1709 #define foreach_ip6_full_reassembly_handoff_error \
1710 _(CONGESTION_DROP, "congestion drop")
1715 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1716 foreach_ip6_full_reassembly_handoff_error
1718 IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1719 } ip6_full_reassembly_handoff_error_t;
1721 static char *ip6_full_reassembly_handoff_error_strings[] = {
1722 #define _(sym,string) string,
1723 foreach_ip6_full_reassembly_handoff_error
1729 u32 next_worker_index;
1730 } ip6_full_reassembly_handoff_trace_t;
1733 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1735 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1736 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1737 ip6_full_reassembly_handoff_trace_t *t =
1738 va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1741 format (s, "ip6-full-reassembly-handoff: next-worker %d",
1742 t->next_worker_index);
1748 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1749 vlib_node_runtime_t * node,
1750 vlib_frame_t * frame, bool is_feature)
1752 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1754 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1755 u32 n_enq, n_left_from, *from;
1756 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1759 from = vlib_frame_vector_args (frame);
1760 n_left_from = frame->n_vectors;
1761 vlib_get_buffers (vm, from, bufs, n_left_from);
1764 ti = thread_indices;
1766 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1768 while (n_left_from > 0)
1770 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1773 ((node->flags & VLIB_NODE_FLAG_TRACE)
1774 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1776 ip6_full_reassembly_handoff_trace_t *t =
1777 vlib_add_trace (vm, node, b[0], sizeof (*t));
1778 t->next_worker_index = ti[0];
1786 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1787 frame->n_vectors, 1);
1789 if (n_enq < frame->n_vectors)
1790 vlib_node_increment_counter (vm, node->node_index,
1791 IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1792 frame->n_vectors - n_enq);
1793 return frame->n_vectors;
1796 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1797 vlib_node_runtime_t * node,
1798 vlib_frame_t * frame)
1800 return ip6_full_reassembly_handoff_inline (vm, node, frame,
1801 false /* is_feature */ );
1805 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1806 .name = "ip6-full-reassembly-handoff",
1807 .vector_size = sizeof (u32),
1808 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1809 .error_strings = ip6_full_reassembly_handoff_error_strings,
1810 .format_trace = format_ip6_full_reassembly_handoff_trace,
1820 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1821 vlib_node_runtime_t * node, vlib_frame_t * frame)
1823 return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1828 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1829 .name = "ip6-full-reass-feature-hoff",
1830 .vector_size = sizeof (u32),
1831 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1832 .error_strings = ip6_full_reassembly_handoff_error_strings,
1833 .format_trace = format_ip6_full_reassembly_handoff_trace,
1843 #ifndef CLIB_MARCH_VARIANT
1845 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1847 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1848 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1851 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1853 ++rm->feature_use_refcount_per_intf[sw_if_index];
1854 return vnet_feature_enable_disable ("ip6-unicast",
1855 "ip6-full-reassembly-feature",
1856 sw_if_index, 1, 0, 0);
1858 ++rm->feature_use_refcount_per_intf[sw_if_index];
1862 --rm->feature_use_refcount_per_intf[sw_if_index];
1863 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1864 return vnet_feature_enable_disable ("ip6-unicast",
1865 "ip6-full-reassembly-feature",
1866 sw_if_index, 0, 0, 0);
1873 * fd.io coding-style-patch-verification: ON
1876 * eval: (c-set-style "gnu")