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;
55 ip6_reass_buffer_get_data_offset_no_check (vlib_buffer_t * b)
57 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
58 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
62 ip6_reass_buffer_get_data_offset (vlib_buffer_t * b)
64 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
65 ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first);
66 return ip6_reass_buffer_get_data_offset_no_check (b);
70 ip6_reass_buffer_get_data_len_no_check (vlib_buffer_t * b)
72 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
73 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
74 (vnb->ip.reass.fragment_first + ip6_reass_buffer_get_data_offset (b)) + 1;
78 ip6_reass_buffer_get_data_len (vlib_buffer_t * b)
80 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
81 ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first);
82 return ip6_reass_buffer_get_data_len_no_check (b);
89 // time when last packet was received
91 // internal id of this reassembly
93 // buffer index of first buffer in this reassembly context
95 // last octet of packet, ~0 until fragment without more_fragments arrives
96 u32 last_packet_octet;
97 // length of data collected so far
99 // trace operation counter
100 u32 trace_op_counter;
101 // next index - used by non-feature node
103 // minimum fragment length for this reassembly - used to estimate MTU
104 u16 min_fragment_length;
113 clib_spinlock_t lock;
114 } ip6_reass_per_thread_t;
121 u32 expire_walk_interval_ms;
125 clib_bihash_48_8_t hash;
128 ip6_reass_per_thread_t *per_thread_data;
131 vlib_main_t *vlib_main;
132 vnet_main_t *vnet_main;
134 // node index of ip6-drop node
136 u32 ip6_icmp_error_idx;
137 u32 ip6_reass_expire_node_idx;
141 ip6_reass_main_t ip6_reass_main;
145 IP6_REASSEMBLY_NEXT_INPUT,
146 IP6_REASSEMBLY_NEXT_DROP,
147 IP6_REASSEMBLY_NEXT_ICMP_ERROR,
148 IP6_REASSEMBLY_N_NEXT,
155 ICMP_ERROR_RT_EXCEEDED,
156 ICMP_ERROR_FL_TOO_BIG,
157 ICMP_ERROR_FL_NOT_MULT_8,
159 } ip6_reass_trace_operation_e;
169 } ip6_reass_range_trace_t;
173 ip6_reass_trace_operation_e action;
175 ip6_reass_range_trace_t trace_range;
184 ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
185 ip6_reass_range_trace_t * trace)
187 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
188 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
189 trace->range_first = vnb->ip.reass.range_first;
190 trace->range_last = vnb->ip.reass.range_last;
191 trace->data_offset = ip6_reass_buffer_get_data_offset_no_check (b);
192 trace->data_len = ip6_reass_buffer_get_data_len_no_check (b);
193 trace->range_bi = bi;
197 format_ip6_reass_range_trace (u8 * s, va_list * args)
199 ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
200 s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
201 trace->range_last, trace->data_offset, trace->data_len,
207 format_ip6_reass_trace (u8 * s, va_list * args)
209 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
210 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
211 ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
212 s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
213 u32 indent = format_get_indent (s);
214 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
215 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
220 s = format (s, "\n%Unew %U", format_white_space, indent,
221 format_ip6_reass_range_trace, &t->trace_range);
224 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
225 format_ip6_reass_range_trace, &t->trace_range);
227 case ICMP_ERROR_FL_TOO_BIG:
228 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
229 format_white_space, indent, format_ip6_reass_range_trace,
232 case ICMP_ERROR_FL_NOT_MULT_8:
233 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
234 format_white_space, indent, format_ip6_reass_range_trace,
237 case ICMP_ERROR_RT_EXCEEDED:
238 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
239 format_white_space, indent);
242 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
249 ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
250 ip6_reass_main_t * rm, ip6_reass_t * reass,
251 u32 bi, ip6_reass_trace_operation_e action,
254 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
255 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
256 if (pool_is_free_index (vm->trace_main.trace_buffer_pool, b->trace_index))
258 // this buffer's trace is gone
259 b->flags &= ~VLIB_BUFFER_IS_TRACED;
262 ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
263 t->reass_id = reass->id;
265 ip6_reass_trace_details (vm, bi, &t->trace_range);
266 t->size_diff = size_diff;
267 t->op_id = reass->trace_op_counter;
268 ++reass->trace_op_counter;
269 t->fragment_first = vnb->ip.reass.fragment_first;
270 t->fragment_last = vnb->ip.reass.fragment_last;
271 t->trace_range.first_bi = reass->first_bi;
272 t->total_data_len = reass->data_len;
275 s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
276 printf ("%.*s\n", vec_len (s), s);
278 vec_reset_length (s);
283 ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
286 clib_bihash_kv_48_8_t kv;
287 kv.key[0] = reass->key.as_u64[0];
288 kv.key[1] = reass->key.as_u64[1];
289 kv.key[2] = reass->key.as_u64[2];
290 kv.key[3] = reass->key.as_u64[3];
291 kv.key[4] = reass->key.as_u64[4];
292 kv.key[5] = reass->key.as_u64[5];
293 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
294 pool_put (rt->pool, reass);
299 ip6_reass_drop_all (vlib_main_t * vm, ip6_reass_main_t * rm,
300 ip6_reass_t * reass, u32 ** vec_drop_bi)
302 u32 range_bi = reass->first_bi;
303 vlib_buffer_t *range_b;
304 vnet_buffer_opaque_t *range_vnb;
305 while (~0 != range_bi)
307 range_b = vlib_get_buffer (vm, range_bi);
308 range_vnb = vnet_buffer (range_b);
312 vec_add1 (*vec_drop_bi, bi);
313 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
314 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
317 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
324 range_bi = range_vnb->ip.reass.next_range_bi;
329 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
330 ip6_reass_main_t * rm, ip6_reass_t * reass,
331 u32 * icmp_bi, u32 ** vec_timeout)
333 if (~0 == reass->first_bi)
337 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
338 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
340 *icmp_bi = reass->first_bi;
341 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
343 ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi,
344 ICMP_ERROR_RT_EXCEEDED, 0);
346 // fragment with offset zero received - send icmp message back
347 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
349 // separate first buffer from chain and steer it towards icmp node
350 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
351 reass->first_bi = b->next_buffer;
355 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
357 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
358 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
361 ip6_reass_drop_all (vm, rm, reass, vec_timeout);
364 always_inline ip6_reass_t *
365 ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
366 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
367 ip6_reass_key_t * k, u32 * icmp_bi,
370 ip6_reass_t *reass = NULL;
371 f64 now = vlib_time_now (rm->vlib_main);
372 clib_bihash_kv_48_8_t kv, value;
373 kv.key[0] = k->as_u64[0];
374 kv.key[1] = k->as_u64[1];
375 kv.key[2] = k->as_u64[2];
376 kv.key[3] = k->as_u64[3];
377 kv.key[4] = k->as_u64[4];
378 kv.key[5] = k->as_u64[5];
380 if (!clib_bihash_search_48_8 (&rm->hash, &kv, &value))
382 reass = pool_elt_at_index (rt->pool, value.value);
383 if (now > reass->last_heard + rm->timeout)
385 ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi, vec_timeout);
386 ip6_reass_free (rm, rt, reass);
393 reass->last_heard = now;
397 if (rt->reass_n >= rm->max_reass_n)
404 pool_get (rt->pool, reass);
405 memset (reass, 0, sizeof (*reass));
407 ((u64) os_get_thread_index () * 1000000000) + rt->id_counter;
409 reass->first_bi = ~0;
410 reass->last_packet_octet = ~0;
415 reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
416 reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
417 reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
418 reass->key.as_u64[3] = kv.key[3] = k->as_u64[3];
419 reass->key.as_u64[4] = kv.key[4] = k->as_u64[4];
420 reass->key.as_u64[5] = kv.key[5] = k->as_u64[5];
421 kv.value = reass - rt->pool;
422 reass->last_heard = now;
424 if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
426 ip6_reass_free (rm, rt, reass);
434 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
435 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
436 ip6_reass_t * reass, u32 * bi0, u32 * next0,
437 u32 * error0, u32 ** vec_drop_compress, bool is_feature)
439 ASSERT (~0 != reass->first_bi);
440 *bi0 = reass->first_bi;
441 *error0 = IP6_ERROR_NONE;
442 ip6_frag_hdr_t *frag_hdr;
443 vlib_buffer_t *last_b = NULL;
444 u32 sub_chain_bi = reass->first_bi;
445 u32 total_length = 0;
450 u32 tmp_bi = sub_chain_bi;
451 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
452 u32 data_len = ip6_reass_buffer_get_data_len (tmp);
453 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
454 sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
456 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
457 if (tmp_bi == reass->first_bi)
459 /* first buffer - keep ip6 header */
460 ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp));
462 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
463 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
465 ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0);
468 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
474 if (trim_front > tmp->current_length)
476 /* drop whole buffer */
477 vec_add1 (*vec_drop_compress, tmp_bi);
479 trim_front -= tmp->current_length;
480 ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
481 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
482 tmp_bi = tmp->next_buffer;
483 tmp = vlib_get_buffer (vm, tmp_bi);
488 vlib_buffer_advance (tmp, trim_front);
496 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
497 last_b->next_buffer = tmp_bi;
500 if (keep_data <= tmp->current_length)
502 tmp->current_length = keep_data;
507 keep_data -= tmp->current_length;
508 ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
510 total_length += tmp->current_length;
514 vec_add1 (*vec_drop_compress, tmp_bi);
515 ASSERT (reass->first_bi != tmp_bi);
518 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
520 tmp_bi = tmp->next_buffer;
521 tmp = vlib_get_buffer (vm, tmp->next_buffer);
529 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
532 while (~0 != sub_chain_bi);
534 ASSERT (last_b != NULL);
535 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
536 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
537 ASSERT (total_length >= first_b->current_length);
538 total_length -= first_b->current_length;
539 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
540 first_b->total_length_not_including_first_buffer = total_length;
541 // drop fragment header
542 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
543 ip6_header_t *ip = vlib_buffer_get_current (first_b);
544 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
545 ip6_ext_header_t *prev_hdr;
546 ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
547 IP_PROTOCOL_IPV6_FRAGMENTATION);
550 prev_hdr->next_hdr = frag_hdr->next_hdr;
554 ip->protocol = frag_hdr->next_hdr;
556 ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset);
557 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
558 first_b->current_length - ip6_frag_hdr_offset -
559 sizeof (ip6_frag_hdr_t));
560 first_b->current_length -= sizeof (*frag_hdr);
562 clib_host_to_net_u16 (total_length + first_b->current_length -
564 vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
565 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
567 ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi, FINALIZE, 0);
569 // following code does a hexdump of packet fragments to stdout ...
572 u32 bi = reass->first_bi;
576 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
577 s = format (s, "%u: %U\n", bi, format_hexdump,
578 vlib_buffer_get_current (b), b->current_length);
579 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
588 printf ("%.*s\n", vec_len (s), s);
597 *next0 = IP6_REASSEMBLY_NEXT_INPUT;
601 *next0 = reass->next_index;
603 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
604 ip6_reass_free (rm, rt, reass);
609 ip6_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
615 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
617 b = vlib_get_buffer (vm, b->next_buffer);
628 ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
629 ip6_reass_per_thread_t * rt,
630 ip6_reass_t * reass, u32 prev_range_bi,
634 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
635 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
636 if (~0 != prev_range_bi)
638 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
639 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
640 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
641 prev_vnb->ip.reass.next_range_bi = new_next_bi;
645 if (~0 != reass->first_bi)
647 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
649 reass->first_bi = new_next_bi;
651 reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
652 rt->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
656 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
657 ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
658 ip6_reass_t * reass, u32 * bi0, u32 * next0,
659 u32 * error0, ip6_frag_hdr_t * frag_hdr,
660 u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
664 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
665 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
666 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
667 fvnb->ip.reass.ip6_frag_hdr_offset =
668 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
669 ip6_header_t *fip = vlib_buffer_get_current (fb);
670 ASSERT (fb->current_length > sizeof (*fip));
671 ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 &&
672 fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length);
673 u32 fragment_first = fvnb->ip.reass.fragment_first =
674 ip6_frag_hdr_offset_bytes (frag_hdr);
675 u32 fragment_length =
676 vlib_buffer_length_in_chain (vm, fb) -
677 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
678 u32 fragment_last = fvnb->ip.reass.fragment_last =
679 fragment_first + fragment_length - 1;
680 int more_fragments = ip6_frag_hdr_more (frag_hdr);
681 u32 candidate_range_bi = reass->first_bi;
682 u32 prev_range_bi = ~0;
683 fvnb->ip.reass.range_first = fragment_first;
684 fvnb->ip.reass.range_last = fragment_last;
685 fvnb->ip.reass.next_range_bi = ~0;
688 reass->last_packet_octet = fragment_last;
690 if (~0 == reass->first_bi)
692 // starting a new reassembly
693 ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
695 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
697 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
699 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
703 reass->min_fragment_length =
704 clib_min (clib_net_to_host_u16 (fip->payload_length),
705 fvnb->ip.reass.estimated_mtu);
706 while (~0 != candidate_range_bi)
708 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
709 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
710 if (fragment_first > candidate_vnb->ip.reass.range_last)
712 // this fragments starts after candidate range
713 prev_range_bi = candidate_range_bi;
714 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
715 if (candidate_vnb->ip.reass.range_last < fragment_last &&
716 ~0 == candidate_range_bi)
718 // special case - this fragment falls beyond all known ranges
719 ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
720 prev_range_bi, *bi0);
726 if (fragment_last < candidate_vnb->ip.reass.range_first)
728 // this fragment ends before candidate range without any overlap
729 ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
733 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
734 fragment_last == candidate_vnb->ip.reass.range_last)
736 // duplicate fragment - ignore
740 // overlapping fragment - not allowed by RFC 8200
741 ip6_reass_drop_all (vm, rm, reass, vec_drop_overlap);
742 ip6_reass_free (rm, rt, reass);
743 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
745 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
748 *next0 = IP6_REASSEMBLY_NEXT_DROP;
749 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
755 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
757 ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
760 if (~0 != reass->last_packet_octet &&
761 reass->data_len == reass->last_packet_octet + 1)
763 ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
764 vec_drop_compress, is_feature);
774 *next0 = IP6_REASSEMBLY_NEXT_DROP;
776 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
782 ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
784 ip6_frag_hdr_t * frag_hdr)
786 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
787 while (ip6_ext_hdr (tmp->next_hdr))
789 tmp = ip6_ext_next_header (tmp);
791 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
793 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
794 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
796 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
804 ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
805 vlib_node_runtime_t * node,
807 ip6_frag_hdr_t * frag_hdr)
809 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
810 ip6_header_t *ip = vlib_buffer_get_current (b);
811 int more_fragments = ip6_frag_hdr_more (frag_hdr);
812 u32 fragment_length =
813 vlib_buffer_length_in_chain (vm, b) -
814 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
815 if (more_fragments && 0 != fragment_length % 8)
817 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
818 ICMP6_parameter_problem_erroneous_header_field,
819 (u8 *) & ip->payload_length - (u8 *) ip);
826 ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
827 vlib_node_runtime_t * node,
829 ip6_frag_hdr_t * frag_hdr)
831 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
832 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
833 u32 fragment_length =
834 vlib_buffer_length_in_chain (vm, b) -
835 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
836 if (fragment_first + fragment_length > 65535)
838 ip6_header_t *ip0 = vlib_buffer_get_current (b);
839 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
840 ICMP6_parameter_problem_erroneous_header_field,
841 (u8 *) & frag_hdr->fragment_offset_and_more
849 ip6_reassembly_inline (vlib_main_t * vm,
850 vlib_node_runtime_t * node,
851 vlib_frame_t * frame, bool is_feature)
853 u32 *from = vlib_frame_vector_args (frame);
854 u32 n_left_from, n_left_to_next, *to_next, next_index;
855 ip6_reass_main_t *rm = &ip6_reass_main;
856 ip6_reass_per_thread_t *rt = &rm->per_thread_data[os_get_thread_index ()];
857 clib_spinlock_lock (&rt->lock);
859 n_left_from = frame->n_vectors;
860 next_index = node->cached_next_index;
861 static u32 *vec_timeout = NULL; // indexes of buffers which timed out
862 static u32 *vec_drop_overlap = NULL; // indexes of buffers dropped due to overlap
863 static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression
864 while (n_left_from > 0 || vec_len (vec_timeout) > 0 ||
865 vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0)
867 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
869 while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
871 u32 bi = vec_pop (vec_timeout);
872 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
873 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
877 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
879 IP6_REASSEMBLY_NEXT_DROP);
880 ASSERT (rt->buffers_n > 0);
884 while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
886 u32 bi = vec_pop (vec_drop_overlap);
887 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
888 b->error = node->errors[IP6_ERROR_REASS_OVERLAPPING_FRAGMENT];
892 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
894 IP6_REASSEMBLY_NEXT_DROP);
895 ASSERT (rt->buffers_n > 0);
899 while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
901 u32 bi = vec_pop (vec_drop_compress);
902 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
903 b->error = node->errors[IP6_ERROR_NONE];
907 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
909 IP6_REASSEMBLY_NEXT_DROP);
910 ASSERT (rt->buffers_n > 0);
914 while (n_left_from > 0 && n_left_to_next > 0)
919 u32 error0 = IP6_ERROR_NONE;
923 b0 = vlib_get_buffer (vm, bi0);
925 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
926 ip6_frag_hdr_t *frag_hdr = NULL;
927 ip6_ext_header_t *prev_hdr;
928 if (ip6_ext_hdr (ip0->protocol))
930 ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
931 IP_PROTOCOL_IPV6_FRAGMENTATION);
935 // this is a regular packet - no fragmentation
936 next0 = IP6_REASSEMBLY_NEXT_INPUT;
939 if (0 == ip6_frag_hdr_offset (frag_hdr))
941 // first fragment - verify upper-layer is present
942 if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
944 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
948 if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
949 || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
952 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
955 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
956 (u8 *) frag_hdr - (u8 *) ip0;
959 k.as_u64[0] = ip0->src_address.as_u64[0];
960 k.as_u64[1] = ip0->src_address.as_u64[1];
961 k.as_u64[2] = ip0->dst_address.as_u64[0];
962 k.as_u64[3] = ip0->dst_address.as_u64[1];
964 (u64) vnet_buffer (b0)->
965 sw_if_index[VLIB_RX] << 32 | frag_hdr->identification;
966 k.as_u64[5] = ip0->protocol;
968 ip6_reass_find_or_create (vm, node, rm, rt, &k, &icmp_bi,
973 ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
974 &error0, frag_hdr, &vec_drop_overlap,
975 &vec_drop_compress, is_feature);
979 next0 = IP6_REASSEMBLY_NEXT_DROP;
980 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
983 b0->error = node->errors[error0];
991 if (is_feature && IP6_ERROR_NONE == error0)
993 vnet_feature_next (&next0, b0);
995 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
996 n_left_to_next, bi0, next0);
1001 next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1002 to_next[0] = icmp_bi;
1004 n_left_to_next -= 1;
1005 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1006 n_left_to_next, icmp_bi,
1013 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1016 clib_spinlock_unlock (&rt->lock);
1017 return frame->n_vectors;
1020 static char *ip6_reassembly_error_strings[] = {
1021 #define _(sym, string) string,
1027 ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
1028 vlib_frame_t * frame)
1030 return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ );
1034 VLIB_REGISTER_NODE (ip6_reass_node, static) = {
1035 .function = ip6_reassembly,
1036 .name = "ip6-reassembly",
1037 .vector_size = sizeof (u32),
1038 .format_trace = format_ip6_reass_trace,
1039 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1040 .error_strings = ip6_reassembly_error_strings,
1041 .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1044 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1045 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1046 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1051 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node, ip6_reassembly);
1054 ip6_reassembly_feature (vlib_main_t * vm,
1055 vlib_node_runtime_t * node, vlib_frame_t * frame)
1057 return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ );
1061 VLIB_REGISTER_NODE (ip6_reass_node_feature, static) = {
1062 .function = ip6_reassembly_feature,
1063 .name = "ip6-reassembly-feature",
1064 .vector_size = sizeof (u32),
1065 .format_trace = format_ip6_reass_trace,
1066 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1067 .error_strings = ip6_reassembly_error_strings,
1068 .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1071 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1072 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1073 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1078 VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node_feature, ip6_reassembly_feature);
1081 VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
1082 .arc_name = "ip6-unicast",
1083 .node_name = "ip6-reassembly-feature",
1084 .runs_before = VNET_FEATURES ("ip6-lookup"),
1090 ip6_reass_get_nbuckets ()
1092 ip6_reass_main_t *rm = &ip6_reass_main;
1096 nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
1098 for (i = 0; i < 31; i++)
1099 if ((1 << i) >= nbuckets)
1108 IP6_EVENT_CONFIG_CHANGED = 1,
1109 } ip6_reass_event_t;
1114 clib_bihash_48_8_t *new_hash;
1115 } ip6_rehash_cb_ctx;
1118 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1120 ip6_rehash_cb_ctx *ctx = _ctx;
1121 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1128 ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1129 u32 expire_walk_interval_ms)
1131 ip6_reass_main.timeout_ms = timeout_ms;
1132 ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1133 ip6_reass_main.max_reass_n = max_reassemblies;
1134 ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1138 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1139 u32 expire_walk_interval_ms)
1141 u32 old_nbuckets = ip6_reass_get_nbuckets ();
1142 ip6_reass_set_params (timeout_ms, max_reassemblies,
1143 expire_walk_interval_ms);
1144 vlib_process_signal_event (ip6_reass_main.vlib_main,
1145 ip6_reass_main.ip6_reass_expire_node_idx,
1146 IP6_EVENT_CONFIG_CHANGED, 0);
1147 u32 new_nbuckets = ip6_reass_get_nbuckets ();
1148 if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1150 clib_bihash_48_8_t new_hash;
1151 memset (&new_hash, 0, sizeof (new_hash));
1152 ip6_rehash_cb_ctx ctx;
1154 ctx.new_hash = &new_hash;
1155 clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1156 new_nbuckets * 1024);
1157 clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1158 ip6_rehash_cb, &ctx);
1161 clib_bihash_free_48_8 (&new_hash);
1166 clib_bihash_free_48_8 (&ip6_reass_main.hash);
1167 clib_memcpy (&ip6_reass_main.hash, &new_hash,
1168 sizeof (ip6_reass_main.hash));
1175 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1176 u32 * expire_walk_interval_ms)
1178 *timeout_ms = ip6_reass_main.timeout_ms;
1179 *max_reassemblies = ip6_reass_main.max_reass_n;
1180 *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1184 static clib_error_t *
1185 ip6_reass_init_function (vlib_main_t * vm)
1187 ip6_reass_main_t *rm = &ip6_reass_main;
1188 clib_error_t *error = 0;
1193 rm->vnet_main = vnet_get_main ();
1195 vec_validate (rm->per_thread_data, vlib_num_workers () + 1);
1196 ip6_reass_per_thread_t *rt;
1197 vec_foreach (rt, rm->per_thread_data)
1199 clib_spinlock_init (&rt->lock);
1200 pool_alloc (rt->pool, rm->max_reass_n);
1203 node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1205 rm->ip6_reass_expire_node_idx = node->index;
1207 ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
1208 IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
1209 IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1211 nbuckets = ip6_reass_get_nbuckets ();
1212 clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1214 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1216 rm->ip6_drop_idx = node->index;
1217 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1219 rm->ip6_icmp_error_idx = node->index;
1221 if ((error = vlib_call_init_function (vm, ip_main_init)))
1223 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1224 ip6_reass_node.index);
1229 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1232 ip6_reass_walk_expired (vlib_main_t * vm,
1233 vlib_node_runtime_t * node, vlib_frame_t * f)
1235 ip6_reass_main_t *rm = &ip6_reass_main;
1236 uword event_type, *event_data = 0;
1240 vlib_process_wait_for_event_or_clock (vm,
1241 (f64) rm->expire_walk_interval_ms
1242 / (f64) MSEC_PER_SEC);
1243 event_type = vlib_process_get_events (vm, &event_data);
1247 case ~0: /* no events => timeout */
1248 /* nothing to do here */
1250 case IP6_EVENT_CONFIG_CHANGED:
1253 clib_warning ("BUG: event type 0x%wx", event_type);
1256 f64 now = vlib_time_now (vm);
1259 u32 *vec_timeout = NULL;
1260 int *pool_indexes_to_free = NULL;
1262 uword thread_index = 0;
1264 const uword nthreads = os_get_nthreads ();
1265 u32 *vec_icmp_bi = NULL;
1266 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1268 ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1269 clib_spinlock_lock (&rt->lock);
1271 vec_reset_length (pool_indexes_to_free);
1273 pool_foreach_index (index, rt->pool, ({
1274 reass = pool_elt_at_index (rt->pool, index);
1275 if (now > reass->last_heard + rm->timeout)
1277 vec_add1 (pool_indexes_to_free, index);
1283 vec_foreach (i, pool_indexes_to_free)
1285 ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1287 u32 before = vec_len (vec_timeout);
1288 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
1289 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1291 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1294 /* the trace is gone, don't trace this buffer anymore */
1295 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1298 ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
1299 u32 after = vec_len (vec_timeout);
1300 ASSERT (rt->buffers_n >= (after - before));
1301 rt->buffers_n -= (after - before);
1304 vec_add1 (vec_icmp_bi, icmp_bi);
1305 ASSERT (rt->buffers_n > 0);
1308 ip6_reass_free (rm, rt, reass);
1312 clib_spinlock_unlock (&rt->lock);
1315 while (vec_len (vec_timeout) > 0)
1317 vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip6_drop_idx);
1318 u32 *to_next = vlib_frame_vector_args (f);
1319 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1320 int trace_frame = 0;
1321 while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
1323 u32 bi = vec_pop (vec_timeout);
1324 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1325 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1327 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1330 /* the trace is gone, don't trace this buffer anymore */
1331 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1338 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1342 n_left_to_next -= 1;
1344 f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1345 vlib_put_frame_to_node (vm, rm->ip6_drop_idx, f);
1348 while (vec_len (vec_icmp_bi) > 0)
1351 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1352 u32 *to_next = vlib_frame_vector_args (f);
1353 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1354 int trace_frame = 0;
1355 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1357 u32 bi = vec_pop (vec_icmp_bi);
1358 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1359 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1361 if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
1364 /* the trace is gone, don't trace this buffer anymore */
1365 b->flags &= ~VLIB_BUFFER_IS_TRACED;
1372 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1376 n_left_to_next -= 1;
1378 f->flags |= (trace_frame * VLIB_FRAME_TRACE);
1379 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1382 vec_free (pool_indexes_to_free);
1383 vec_free (vec_timeout);
1384 vec_free (vec_icmp_bi);
1387 _vec_len (event_data) = 0;
1394 static vlib_node_registration_t ip6_reass_expire_node;
1397 VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
1398 .function = ip6_reass_walk_expired,
1399 .format_trace = format_ip6_reass_trace,
1400 .type = VLIB_NODE_TYPE_PROCESS,
1401 .name = "ip6-reassembly-expire-walk",
1403 .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1404 .error_strings = ip6_reassembly_error_strings,
1410 format_ip6_reass_key (u8 * s, va_list * args)
1412 ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1413 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1414 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1415 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1420 format_ip6_reass (u8 * s, va_list * args)
1422 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1423 ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1425 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1426 "last_packet_octet: %u, trace_op_counter: %u\n",
1427 reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1428 reass->data_len, reass->last_packet_octet,
1429 reass->trace_op_counter);
1430 u32 bi = reass->first_bi;
1434 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1435 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1436 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1437 "fragment[%u, %u]\n",
1438 counter, vnb->ip.reass.range_first,
1439 vnb->ip.reass.range_last, bi,
1440 ip6_reass_buffer_get_data_offset_no_check (b),
1441 ip6_reass_buffer_get_data_len_no_check (b),
1442 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1443 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1445 bi = b->next_buffer;
1455 static clib_error_t *
1456 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1457 CLIB_UNUSED (vlib_cli_command_t * lmd))
1459 ip6_reass_main_t *rm = &ip6_reass_main;
1461 vlib_cli_output (vm, "---------------------");
1462 vlib_cli_output (vm, "IP6 reassembly status");
1463 vlib_cli_output (vm, "---------------------");
1464 bool details = false;
1465 if (unformat (input, "details"))
1470 u32 sum_reass_n = 0;
1471 u64 sum_buffers_n = 0;
1474 const uword nthreads = os_get_nthreads ();
1475 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1477 ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1478 clib_spinlock_lock (&rt->lock);
1482 pool_foreach (reass, rt->pool, {
1483 vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1487 sum_reass_n += rt->reass_n;
1488 sum_buffers_n += rt->buffers_n;
1489 clib_spinlock_unlock (&rt->lock);
1491 vlib_cli_output (vm, "---------------------");
1492 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1493 (long unsigned) sum_reass_n);
1494 vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1495 "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1496 vlib_cli_output (vm, "Buffers in use: %lu\n",
1497 (long unsigned) sum_buffers_n);
1502 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1503 .path = "show ip6-reassembly",
1504 .short_help = "show ip6-reassembly [details]",
1505 .function = show_ip6_reass,
1510 ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1512 return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
1513 sw_if_index, enable_disable, 0, 0);
1517 * fd.io coding-style-patch-verification: ON
1520 * eval: (c-set-style "gnu")