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 Reassembly.
20 * This file contains the source code for IPv6 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/ip6_reassembly.h>
29 #define MSEC_PER_SEC 1000
30 #define IP6_REASS_TIMEOUT_DEFAULT_MS 100
31 #define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
32 #define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024
33 #define IP6_REASS_HT_LOAD_FACTOR (0.75)
35 static vlib_node_registration_t ip6_reass_node;
45 // align by making this 4 octets even though its a 2 octets field
47 // align by making this 4 octets even though its a 2 octets field
49 // align by making this 4 octets even though its a 1 octet field
58 ip6_reass_buffer_get_data_offset_no_check (vlib_buffer_t * b)
60 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
61 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
65 ip6_reass_buffer_get_data_offset (vlib_buffer_t * b)
67 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
68 ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first);
69 return ip6_reass_buffer_get_data_offset_no_check (b);
73 ip6_reass_buffer_get_data_len_no_check (vlib_buffer_t * b)
75 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
76 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
77 (vnb->ip.reass.fragment_first + ip6_reass_buffer_get_data_offset (b)) + 1;
81 ip6_reass_buffer_get_data_len (vlib_buffer_t * b)
83 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
84 ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first);
85 return ip6_reass_buffer_get_data_len_no_check (b);
92 // time when last packet was received
94 // internal id of this reassembly
96 // buffer index of first buffer in this reassembly context
98 // last octet of packet, ~0 until fragment without more_fragments arrives
99 u32 last_packet_octet;
100 // length of data collected so far
102 // trace operation counter
103 u32 trace_op_counter;
104 // next index - used by non-feature node
106 // minimum fragment length for this reassembly - used to estimate MTU
107 u16 min_fragment_length;
116 clib_spinlock_t lock;
117 } ip6_reass_per_thread_t;
124 u32 expire_walk_interval_ms;
128 clib_bihash_48_8_t hash;
131 ip6_reass_per_thread_t *per_thread_data;
134 vlib_main_t *vlib_main;
135 vnet_main_t *vnet_main;
137 // node index of ip6-drop node
139 u32 ip6_icmp_error_idx;
140 u32 ip6_reass_expire_node_idx;
144 ip6_reass_main_t ip6_reass_main;
148 IP6_REASSEMBLY_NEXT_INPUT,
149 IP6_REASSEMBLY_NEXT_DROP,
150 IP6_REASSEMBLY_NEXT_ICMP_ERROR,
151 IP6_REASSEMBLY_N_NEXT,
158 ICMP_ERROR_RT_EXCEEDED,
159 ICMP_ERROR_FL_TOO_BIG,
160 ICMP_ERROR_FL_NOT_MULT_8,
162 } ip6_reass_trace_operation_e;
172 } ip6_reass_range_trace_t;
176 ip6_reass_trace_operation_e action;
178 ip6_reass_range_trace_t trace_range;
187 ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
188 ip6_reass_range_trace_t * trace)
190 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
191 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
192 trace->range_first = vnb->ip.reass.range_first;
193 trace->range_last = vnb->ip.reass.range_last;
194 trace->data_offset = ip6_reass_buffer_get_data_offset_no_check (b);
195 trace->data_len = ip6_reass_buffer_get_data_len_no_check (b);
196 trace->range_bi = bi;
200 format_ip6_reass_range_trace (u8 * s, va_list * args)
202 ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
203 s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
204 trace->range_last, trace->data_offset, trace->data_len,
210 format_ip6_reass_trace (u8 * s, va_list * args)
212 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
213 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
214 ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
215 s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
216 u32 indent = format_get_indent (s);
217 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
218 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
223 s = format (s, "\n%Unew %U", format_white_space, indent,
224 format_ip6_reass_range_trace, &t->trace_range);
227 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
228 format_ip6_reass_range_trace, &t->trace_range);
230 case ICMP_ERROR_FL_TOO_BIG:
231 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
232 format_white_space, indent, format_ip6_reass_range_trace,
235 case ICMP_ERROR_FL_NOT_MULT_8:
236 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
237 format_white_space, indent, format_ip6_reass_range_trace,
240 case ICMP_ERROR_RT_EXCEEDED:
241 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
242 format_white_space, indent);
245 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
252 ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
253 ip6_reass_main_t * rm, ip6_reass_t * reass,
254 u32 bi, ip6_reass_trace_operation_e action,
257 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
258 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
259 if (pool_is_free_index (vm->trace_main.trace_buffer_pool, b->trace_index))
261 // this buffer's trace is gone
262 b->flags &= ~VLIB_BUFFER_IS_TRACED;
265 ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
266 t->reass_id = reass->id;
268 ip6_reass_trace_details (vm, bi, &t->trace_range);
269 t->size_diff = size_diff;
270 t->op_id = reass->trace_op_counter;
271 ++reass->trace_op_counter;
272 t->fragment_first = vnb->ip.reass.fragment_first;
273 t->fragment_last = vnb->ip.reass.fragment_last;
274 t->trace_range.first_bi = reass->first_bi;
275 t->total_data_len = reass->data_len;
278 s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
279 printf ("%.*s\n", vec_len (s), s);
281 vec_reset_length (s);
286 ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
289 clib_bihash_kv_48_8_t kv;
290 kv.key[0] = reass->key.as_u64[0];
291 kv.key[1] = reass->key.as_u64[1];
292 kv.key[2] = reass->key.as_u64[2];
293 kv.key[3] = reass->key.as_u64[3];
294 kv.key[4] = reass->key.as_u64[4];
295 kv.key[5] = reass->key.as_u64[5];
296 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
297 pool_put (rt->pool, reass);
302 ip6_reass_drop_all (vlib_main_t * vm, ip6_reass_main_t * rm,
303 ip6_reass_t * reass, u32 ** vec_drop_bi)
305 u32 range_bi = reass->first_bi;
306 vlib_buffer_t *range_b;
307 vnet_buffer_opaque_t *range_vnb;
308 while (~0 != range_bi)
310 range_b = vlib_get_buffer (vm, range_bi);
311 range_vnb = vnet_buffer (range_b);
315 vec_add1 (*vec_drop_bi, bi);
316 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
317 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
320 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
327 range_bi = range_vnb->ip.reass.next_range_bi;
332 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
333 ip6_reass_main_t * rm, ip6_reass_t * reass,
334 u32 * icmp_bi, u32 ** vec_timeout)
336 if (~0 == reass->first_bi)
340 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
341 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
343 *icmp_bi = reass->first_bi;
344 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
346 ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi,
347 ICMP_ERROR_RT_EXCEEDED, 0);
349 // fragment with offset zero received - send icmp message back
350 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
352 // separate first buffer from chain and steer it towards icmp node
353 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
354 reass->first_bi = b->next_buffer;
358 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
360 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
361 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
364 ip6_reass_drop_all (vm, rm, reass, vec_timeout);
367 always_inline ip6_reass_t *
368 ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
369 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
370 ip6_reass_key_t * k, u32 * icmp_bi,
373 ip6_reass_t *reass = NULL;
374 f64 now = vlib_time_now (rm->vlib_main);
375 clib_bihash_kv_48_8_t kv, value;
376 kv.key[0] = k->as_u64[0];
377 kv.key[1] = k->as_u64[1];
378 kv.key[2] = k->as_u64[2];
379 kv.key[3] = k->as_u64[3];
380 kv.key[4] = k->as_u64[4];
381 kv.key[5] = k->as_u64[5];
383 if (!clib_bihash_search_48_8 (&rm->hash, &kv, &value))
385 reass = pool_elt_at_index (rt->pool, value.value);
386 if (now > reass->last_heard + rm->timeout)
388 ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi, vec_timeout);
389 ip6_reass_free (rm, rt, reass);
396 reass->last_heard = now;
400 if (rt->reass_n >= rm->max_reass_n)
407 pool_get (rt->pool, reass);
408 memset (reass, 0, sizeof (*reass));
410 ((u64) os_get_thread_index () * 1000000000) + rt->id_counter;
412 reass->first_bi = ~0;
413 reass->last_packet_octet = ~0;
418 reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
419 reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
420 reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
421 reass->key.as_u64[3] = kv.key[3] = k->as_u64[3];
422 reass->key.as_u64[4] = kv.key[4] = k->as_u64[4];
423 reass->key.as_u64[5] = kv.key[5] = k->as_u64[5];
424 kv.value = reass - rt->pool;
425 reass->last_heard = now;
427 if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
429 ip6_reass_free (rm, rt, reass);
437 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
438 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
439 ip6_reass_t * reass, u32 * bi0, u32 * next0,
440 u32 * error0, u32 ** vec_drop_compress, bool is_feature)
442 ASSERT (~0 != reass->first_bi);
443 *bi0 = reass->first_bi;
444 *error0 = IP6_ERROR_NONE;
445 ip6_frag_hdr_t *frag_hdr;
446 vlib_buffer_t *last_b = NULL;
447 u32 sub_chain_bi = reass->first_bi;
448 u32 total_length = 0;
453 u32 tmp_bi = sub_chain_bi;
454 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
455 u32 data_len = ip6_reass_buffer_get_data_len (tmp);
456 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
457 sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
459 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
460 if (tmp_bi == reass->first_bi)
462 /* first buffer - keep ip6 header */
463 ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp));
465 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
466 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
468 ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0);
471 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
477 if (trim_front > tmp->current_length)
479 /* drop whole buffer */
480 vec_add1 (*vec_drop_compress, tmp_bi);
482 trim_front -= tmp->current_length;
483 ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
484 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
485 tmp_bi = tmp->next_buffer;
486 tmp = vlib_get_buffer (vm, tmp_bi);
491 vlib_buffer_advance (tmp, trim_front);
499 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
500 last_b->next_buffer = tmp_bi;
503 if (keep_data <= tmp->current_length)
505 tmp->current_length = keep_data;
510 keep_data -= tmp->current_length;
511 ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
513 total_length += tmp->current_length;
517 vec_add1 (*vec_drop_compress, tmp_bi);
518 ASSERT (reass->first_bi != tmp_bi);
521 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
523 tmp_bi = tmp->next_buffer;
524 tmp = vlib_get_buffer (vm, tmp->next_buffer);
532 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
535 while (~0 != sub_chain_bi);
537 ASSERT (last_b != NULL);
538 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
539 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
540 ASSERT (total_length >= first_b->current_length);
541 total_length -= first_b->current_length;
542 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
543 first_b->total_length_not_including_first_buffer = total_length;
544 // drop fragment header
545 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
546 ip6_header_t *ip = vlib_buffer_get_current (first_b);
547 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
548 ip6_ext_header_t *prev_hdr;
549 ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
550 IP_PROTOCOL_IPV6_FRAGMENTATION);
553 prev_hdr->next_hdr = frag_hdr->next_hdr;
557 ip->protocol = frag_hdr->next_hdr;
559 ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset);
560 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
561 first_b->current_length - ip6_frag_hdr_offset -
562 sizeof (ip6_frag_hdr_t));
563 first_b->current_length -= sizeof (*frag_hdr);
565 clib_host_to_net_u16 (total_length + first_b->current_length -
567 vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
568 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
570 ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi, FINALIZE, 0);
572 // following code does a hexdump of packet fragments to stdout ...
575 u32 bi = reass->first_bi;
579 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
580 s = format (s, "%u: %U\n", bi, format_hexdump,
581 vlib_buffer_get_current (b), b->current_length);
582 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
591 printf ("%.*s\n", vec_len (s), s);
600 *next0 = IP6_REASSEMBLY_NEXT_INPUT;
604 *next0 = reass->next_index;
606 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
607 ip6_reass_free (rm, rt, reass);
612 ip6_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
618 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
620 b = vlib_get_buffer (vm, b->next_buffer);
631 ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
632 ip6_reass_per_thread_t * rt,
633 ip6_reass_t * reass, u32 prev_range_bi,
637 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
638 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
639 if (~0 != prev_range_bi)
641 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
642 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
643 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
644 prev_vnb->ip.reass.next_range_bi = new_next_bi;
648 if (~0 != reass->first_bi)
650 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
652 reass->first_bi = new_next_bi;
654 reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
655 rt->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
659 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
660 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
661 ip6_reass_t * reass, u32 * bi0, u32 * next0,
662 u32 * error0, ip6_frag_hdr_t * frag_hdr,
663 u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
667 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
668 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
669 fvnb->ip.reass.ip6_frag_hdr_offset =
670 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
671 ip6_header_t *fip = vlib_buffer_get_current (fb);
672 ASSERT (fb->current_length > sizeof (*fip));
673 ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 &&
674 fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length);
675 u32 fragment_first = fvnb->ip.reass.fragment_first =
676 ip6_frag_hdr_offset_bytes (frag_hdr);
677 u32 fragment_length =
678 vlib_buffer_length_in_chain (vm, fb) -
679 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
680 u32 fragment_last = fvnb->ip.reass.fragment_last =
681 fragment_first + fragment_length - 1;
682 int more_fragments = ip6_frag_hdr_more (frag_hdr);
683 u32 candidate_range_bi = reass->first_bi;
684 u32 prev_range_bi = ~0;
685 fvnb->ip.reass.range_first = fragment_first;
686 fvnb->ip.reass.range_last = fragment_last;
687 fvnb->ip.reass.next_range_bi = ~0;
690 reass->last_packet_octet = fragment_last;
692 if (~0 == reass->first_bi)
694 // starting a new reassembly
695 ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
697 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
699 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
701 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
705 reass->min_fragment_length =
706 clib_min (clib_net_to_host_u16 (fip->payload_length),
707 fvnb->ip.reass.estimated_mtu);
708 while (~0 != candidate_range_bi)
710 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
711 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
712 if (fragment_first > candidate_vnb->ip.reass.range_last)
714 // this fragments starts after candidate range
715 prev_range_bi = candidate_range_bi;
716 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
717 if (candidate_vnb->ip.reass.range_last < fragment_last &&
718 ~0 == candidate_range_bi)
720 // special case - this fragment falls beyond all known ranges
721 ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
722 prev_range_bi, *bi0);
728 if (fragment_last < candidate_vnb->ip.reass.range_first)
730 // this fragment ends before candidate range without any overlap
731 ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
735 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
736 fragment_last == candidate_vnb->ip.reass.range_last)
738 // duplicate fragment - ignore
742 // overlapping fragment - not allowed by RFC 8200
743 ip6_reass_drop_all (vm, rm, reass, vec_drop_overlap);
744 ip6_reass_free (rm, rt, reass);
745 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
747 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
750 *next0 = IP6_REASSEMBLY_NEXT_DROP;
751 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
757 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
759 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
762 if (~0 != reass->last_packet_octet &&
763 reass->data_len == reass->last_packet_octet + 1)
765 ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
766 vec_drop_compress, is_feature);
776 *next0 = IP6_REASSEMBLY_NEXT_DROP;
778 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
784 ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
786 ip6_frag_hdr_t * frag_hdr)
788 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
789 while (ip6_ext_hdr (tmp->next_hdr))
791 tmp = ip6_ext_next_header (tmp);
793 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
795 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
796 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
798 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
806 ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
807 vlib_node_runtime_t * node,
809 ip6_frag_hdr_t * frag_hdr)
811 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
812 ip6_header_t *ip = vlib_buffer_get_current (b);
813 int more_fragments = ip6_frag_hdr_more (frag_hdr);
814 u32 fragment_length =
815 vlib_buffer_length_in_chain (vm, b) -
816 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
817 if (more_fragments && 0 != fragment_length % 8)
819 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
820 ICMP6_parameter_problem_erroneous_header_field,
821 (u8 *) & ip->payload_length - (u8 *) ip);
828 ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
829 vlib_node_runtime_t * node,
831 ip6_frag_hdr_t * frag_hdr)
833 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
834 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
835 u32 fragment_length =
836 vlib_buffer_length_in_chain (vm, b) -
837 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
838 if (fragment_first + fragment_length > 65535)
840 ip6_header_t *ip0 = vlib_buffer_get_current (b);
841 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
842 ICMP6_parameter_problem_erroneous_header_field,
843 (u8 *) & frag_hdr->fragment_offset_and_more
851 ip6_reassembly_inline (vlib_main_t * vm,
852 vlib_node_runtime_t * node,
853 vlib_frame_t * frame, bool is_feature)
855 u32 *from = vlib_frame_vector_args (frame);
856 u32 n_left_from, n_left_to_next, *to_next, next_index;
857 ip6_reass_main_t *rm = &ip6_reass_main;
858 ip6_reass_per_thread_t *rt = &rm->per_thread_data[os_get_thread_index ()];
859 clib_spinlock_lock (&rt->lock);
861 n_left_from = frame->n_vectors;
862 next_index = node->cached_next_index;
863 static u32 *vec_timeout = NULL; // indexes of buffers which timed out
864 static u32 *vec_drop_overlap = NULL; // indexes of buffers dropped due to overlap
865 static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression
866 while (n_left_from > 0 || vec_len (vec_timeout) > 0 ||
867 vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0)
869 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
871 while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
873 u32 bi = vec_pop (vec_timeout);
874 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
875 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
879 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
881 IP6_REASSEMBLY_NEXT_DROP);
882 ASSERT (rt->buffers_n > 0);
886 while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
888 u32 bi = vec_pop (vec_drop_overlap);
889 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
890 b->error = node->errors[IP6_ERROR_REASS_OVERLAPPING_FRAGMENT];
894 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
896 IP6_REASSEMBLY_NEXT_DROP);
897 ASSERT (rt->buffers_n > 0);
901 while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
903 u32 bi = vec_pop (vec_drop_compress);
904 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
905 b->error = node->errors[IP6_ERROR_NONE];
909 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
911 IP6_REASSEMBLY_NEXT_DROP);
912 ASSERT (rt->buffers_n > 0);
916 while (n_left_from > 0 && n_left_to_next > 0)
921 u32 error0 = IP6_ERROR_NONE;
925 b0 = vlib_get_buffer (vm, bi0);
927 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
928 ip6_frag_hdr_t *frag_hdr = NULL;
929 ip6_ext_header_t *prev_hdr;
930 if (ip6_ext_hdr (ip0->protocol))
932 ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
933 IP_PROTOCOL_IPV6_FRAGMENTATION);
937 // this is a regular packet - no fragmentation
938 next0 = IP6_REASSEMBLY_NEXT_INPUT;
941 if (0 == ip6_frag_hdr_offset (frag_hdr))
943 // first fragment - verify upper-layer is present
944 if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
946 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
950 if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
951 || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
954 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
957 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
958 (u8 *) frag_hdr - (u8 *) ip0;
961 k.src.as_u64[0] = ip0->src_address.as_u64[0];
962 k.src.as_u64[1] = ip0->src_address.as_u64[1];
963 k.dst.as_u64[0] = ip0->dst_address.as_u64[0];
964 k.dst.as_u64[1] = ip0->dst_address.as_u64[1];
965 k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
966 k.frag_id = frag_hdr->identification;
967 k.proto = ip0->protocol;
970 ip6_reass_find_or_create (vm, node, rm, rt, &k, &icmp_bi,
975 ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
976 &error0, frag_hdr, &vec_drop_overlap,
977 &vec_drop_compress, is_feature);
981 next0 = IP6_REASSEMBLY_NEXT_DROP;
982 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
985 b0->error = node->errors[error0];
993 if (is_feature && IP6_ERROR_NONE == error0)
995 vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX],
998 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
999 n_left_to_next, bi0, next0);
1004 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1005 to_next[0] = icmp_bi;
1007 n_left_to_next -= 1;
1008 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1009 n_left_to_next, icmp_bi,
1016 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1019 clib_spinlock_unlock (&rt->lock);
1020 return frame->n_vectors;
1023 static char *ip6_reassembly_error_strings[] = {
1024 #define _(sym, string) string,
1030 ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
1031 vlib_frame_t * frame)
1033 return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ );
1037 VLIB_REGISTER_NODE (ip6_reass_node, static) = {
1038 .function = ip6_reassembly,
1039 .name = "ip6-reassembly",
1040 .vector_size = sizeof (u32),
1041 .format_trace = format_ip6_reass_trace,
1042 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1043 .error_strings = ip6_reassembly_error_strings,
1044 .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1047 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1048 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1049 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1054 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node, ip6_reassembly);
1057 ip6_reassembly_feature (vlib_main_t * vm,
1058 vlib_node_runtime_t * node, vlib_frame_t * frame)
1060 return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ );
1064 VLIB_REGISTER_NODE (ip6_reass_node_feature, static) = {
1065 .function = ip6_reassembly_feature,
1066 .name = "ip6-reassembly-feature",
1067 .vector_size = sizeof (u32),
1068 .format_trace = format_ip6_reass_trace,
1069 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1070 .error_strings = ip6_reassembly_error_strings,
1071 .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1074 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1075 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1076 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1081 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node_feature, ip6_reassembly_feature);
1084 VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
1085 .arc_name = "ip6-unicast",
1086 .node_name = "ip6-reassembly-feature",
1087 .runs_before = VNET_FEATURES ("ip6-lookup"),
1093 ip6_reass_get_nbuckets ()
1095 ip6_reass_main_t *rm = &ip6_reass_main;
1099 nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
1101 for (i = 0; i < 31; i++)
1102 if ((1 << i) >= nbuckets)
1111 IP6_EVENT_CONFIG_CHANGED = 1,
1112 } ip6_reass_event_t;
1117 clib_bihash_48_8_t *new_hash;
1118 } ip6_rehash_cb_ctx;
1121 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1123 ip6_rehash_cb_ctx *ctx = _ctx;
1124 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1131 ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1132 u32 expire_walk_interval_ms)
1134 ip6_reass_main.timeout_ms = timeout_ms;
1135 ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1136 ip6_reass_main.max_reass_n = max_reassemblies;
1137 ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1141 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1142 u32 expire_walk_interval_ms)
1144 u32 old_nbuckets = ip6_reass_get_nbuckets ();
1145 ip6_reass_set_params (timeout_ms, max_reassemblies,
1146 expire_walk_interval_ms);
1147 vlib_process_signal_event (ip6_reass_main.vlib_main,
1148 ip6_reass_main.ip6_reass_expire_node_idx,
1149 IP6_EVENT_CONFIG_CHANGED, 0);
1150 u32 new_nbuckets = ip6_reass_get_nbuckets ();
1151 if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1153 clib_bihash_48_8_t new_hash;
1154 memset (&new_hash, 0, sizeof (new_hash));
1155 ip6_rehash_cb_ctx ctx;
1157 ctx.new_hash = &new_hash;
1158 clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1159 new_nbuckets * 1024);
1160 clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1161 ip6_rehash_cb, &ctx);
1164 clib_bihash_free_48_8 (&new_hash);
1169 clib_bihash_free_48_8 (&ip6_reass_main.hash);
1170 clib_memcpy (&ip6_reass_main.hash, &new_hash,
1171 sizeof (ip6_reass_main.hash));
1178 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1179 u32 * expire_walk_interval_ms)
1181 *timeout_ms = ip6_reass_main.timeout_ms;
1182 *max_reassemblies = ip6_reass_main.max_reass_n;
1183 *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1187 static clib_error_t *
1188 ip6_reass_init_function (vlib_main_t * vm)
1190 ip6_reass_main_t *rm = &ip6_reass_main;
1191 clib_error_t *error = 0;
1196 rm->vnet_main = vnet_get_main ();
1198 vec_validate (rm->per_thread_data, vlib_num_workers () + 1);
1199 ip6_reass_per_thread_t *rt;
1200 vec_foreach (rt, rm->per_thread_data)
1202 clib_spinlock_init (&rt->lock);
1203 pool_alloc (rt->pool, rm->max_reass_n);
1206 node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1208 rm->ip6_reass_expire_node_idx = node->index;
1210 ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
1211 IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
1212 IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1214 nbuckets = ip6_reass_get_nbuckets ();
1215 clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1217 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1219 rm->ip6_drop_idx = node->index;
1220 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1222 rm->ip6_icmp_error_idx = node->index;
1224 if ((error = vlib_call_init_function (vm, ip_main_init)))
1226 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1227 ip6_reass_node.index);
1232 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1235 ip6_reass_walk_expired (vlib_main_t * vm,
1236 vlib_node_runtime_t * node, vlib_frame_t * f)
1238 ip6_reass_main_t *rm = &ip6_reass_main;
1239 uword event_type, *event_data = 0;
1243 vlib_process_wait_for_event_or_clock (vm,
1244 (f64) rm->expire_walk_interval_ms
1245 / (f64) MSEC_PER_SEC);
1246 event_type = vlib_process_get_events (vm, &event_data);
1250 case ~0: /* no events => timeout */
1251 /* nothing to do here */
1253 case IP6_EVENT_CONFIG_CHANGED:
1256 clib_warning ("BUG: event type 0x%wx", event_type);
1259 f64 now = vlib_time_now (vm);
1262 u32 *vec_timeout = NULL;
1263 int *pool_indexes_to_free = NULL;
1265 uword thread_index = 0;
1267 const uword nthreads = os_get_nthreads ();
1268 u32 *vec_icmp_bi = NULL;
1269 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1271 ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1272 clib_spinlock_lock (&rt->lock);
1274 vec_reset_length (pool_indexes_to_free);
1276 pool_foreach_index (index, rt->pool, ({
1277 reass = pool_elt_at_index (rt->pool, index);
1278 if (now > reass->last_heard + rm->timeout)
1280 vec_add1 (pool_indexes_to_free, index);
1286 vec_foreach (i, pool_indexes_to_free)
1288 ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1290 u32 before = vec_len (vec_timeout);
1291 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
1292 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1294 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1297 /* the trace is gone, don't trace this buffer anymore */
1298 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1301 ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
1302 u32 after = vec_len (vec_timeout);
1303 ASSERT (rt->buffers_n >= (after - before));
1304 rt->buffers_n -= (after - before);
1307 vec_add1 (vec_icmp_bi, icmp_bi);
1308 ASSERT (rt->buffers_n > 0);
1311 ip6_reass_free (rm, rt, reass);
1315 clib_spinlock_unlock (&rt->lock);
1318 while (vec_len (vec_timeout) > 0)
1320 vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip6_drop_idx);
1321 u32 *to_next = vlib_frame_vector_args (f);
1322 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1323 int trace_frame = 0;
1324 while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
1326 u32 bi = vec_pop (vec_timeout);
1327 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1328 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1330 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1333 /* the trace is gone, don't trace this buffer anymore */
1334 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1341 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1345 n_left_to_next -= 1;
1347 f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1348 vlib_put_frame_to_node (vm, rm->ip6_drop_idx, f);
1351 while (vec_len (vec_icmp_bi) > 0)
1354 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1355 u32 *to_next = vlib_frame_vector_args (f);
1356 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1357 int trace_frame = 0;
1358 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1360 u32 bi = vec_pop (vec_icmp_bi);
1361 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1362 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1364 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1367 /* the trace is gone, don't trace this buffer anymore */
1368 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1375 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1379 n_left_to_next -= 1;
1381 f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1382 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1385 vec_free (pool_indexes_to_free);
1386 vec_free (vec_timeout);
1387 vec_free (vec_icmp_bi);
1390 _vec_len (event_data) = 0;
1397 static vlib_node_registration_t ip6_reass_expire_node;
1400 VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
1401 .function = ip6_reass_walk_expired,
1402 .format_trace = format_ip6_reass_trace,
1403 .type = VLIB_NODE_TYPE_PROCESS,
1404 .name = "ip6-reassembly-expire-walk",
1406 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1407 .error_strings = ip6_reassembly_error_strings,
1413 format_ip6_reass_key (u8 * s, va_list * args)
1415 ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1416 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1417 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1418 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1423 format_ip6_reass (u8 * s, va_list * args)
1425 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1426 ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1428 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1429 "last_packet_octet: %u, trace_op_counter: %u\n",
1430 reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1431 reass->data_len, reass->last_packet_octet,
1432 reass->trace_op_counter);
1433 u32 bi = reass->first_bi;
1437 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1438 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1439 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1440 "fragment[%u, %u]\n",
1441 counter, vnb->ip.reass.range_first,
1442 vnb->ip.reass.range_last, bi,
1443 ip6_reass_buffer_get_data_offset_no_check (b),
1444 ip6_reass_buffer_get_data_len_no_check (b),
1445 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1446 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1448 bi = b->next_buffer;
1458 static clib_error_t *
1459 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1460 CLIB_UNUSED (vlib_cli_command_t * lmd))
1462 ip6_reass_main_t *rm = &ip6_reass_main;
1464 vlib_cli_output (vm, "---------------------");
1465 vlib_cli_output (vm, "IP6 reassembly status");
1466 vlib_cli_output (vm, "---------------------");
1467 bool details = false;
1468 if (unformat (input, "details"))
1473 u32 sum_reass_n = 0;
1474 u64 sum_buffers_n = 0;
1477 const uword nthreads = os_get_nthreads ();
1478 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1480 ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1481 clib_spinlock_lock (&rt->lock);
1485 pool_foreach (reass, rt->pool, {
1486 vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1490 sum_reass_n += rt->reass_n;
1491 sum_buffers_n += rt->buffers_n;
1492 clib_spinlock_unlock (&rt->lock);
1494 vlib_cli_output (vm, "---------------------");
1495 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1496 (long unsigned) sum_reass_n);
1497 vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1498 "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1499 vlib_cli_output (vm, "Buffers in use: %lu\n",
1500 (long unsigned) sum_buffers_n);
1505 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1506 .path = "show ip6-reassembly",
1507 .short_help = "show ip6-reassembly [details]",
1508 .function = show_ip6_reass,
1513 ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1515 return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
1516 sw_if_index, enable_disable, 0, 0);
1520 * fd.io coding-style-patch-verification: ON
1523 * eval: (c-set-style "gnu")