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>
28 #include <vnet/ip/ip6_inlines.h>
30 #define MSEC_PER_SEC 1000
31 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
32 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
33 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
34 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
35 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
40 IP6_FULL_REASS_RC_INTERNAL_ERROR,
41 IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
42 IP6_FULL_REASS_RC_NO_BUF,
43 IP6_FULL_REASS_RC_HANDOFF,
44 IP6_FULL_REASS_RC_INVALID_FRAG_LEN,
45 } ip6_full_reass_rc_t;
62 } ip6_full_reass_key_t;
69 u32 memory_owner_thread_index;
72 } ip6_full_reass_val_t;
78 ip6_full_reass_key_t k;
79 ip6_full_reass_val_t v;
81 clib_bihash_kv_48_8_t kv;
82 } ip6_full_reass_kv_t;
86 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
88 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
89 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
93 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
95 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
96 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
97 (vnb->ip.reass.fragment_first +
98 ip6_full_reass_buffer_get_data_offset (b)) + 1;
104 ip6_full_reass_key_t key;
105 // time when last packet was received
107 // internal id of this reassembly
109 // buffer index of first buffer in this reassembly context
111 // last octet of packet, ~0 until fragment without more_fragments arrives
112 u32 last_packet_octet;
113 // length of data collected so far
115 // trace operation counter
116 u32 trace_op_counter;
117 // next index - used by custom apps (~0 if not set)
119 // error next index - used by custom apps (~0 if not set)
120 u32 error_next_index;
121 // minimum fragment length for this reassembly - used to estimate MTU
122 u16 min_fragment_length;
123 // number of fragments for this reassembly
125 // thread owning memory for this context (whose pool contains this ctx)
126 u32 memory_owner_thread_index;
127 // thread which received fragment with offset 0 and which sends out the
128 // completed reassembly
129 u32 sendout_thread_index;
134 ip6_full_reass_t *pool;
137 clib_spinlock_t lock;
138 } ip6_full_reass_per_thread_t;
145 u32 expire_walk_interval_ms;
146 // maximum number of fragments in one reassembly
148 // maximum number of reassemblies
152 clib_bihash_48_8_t hash;
155 ip6_full_reass_per_thread_t *per_thread_data;
158 vlib_main_t *vlib_main;
160 // node index of ip6-drop node
162 u32 ip6_icmp_error_idx;
163 u32 ip6_full_reass_expire_node_idx;
165 /** Worker handoff */
168 u32 fq_feature_index;
170 // reference count for enabling/disabling feature - per interface
171 u32 *feature_use_refcount_per_intf;
173 // whether local fragmented packets are reassembled or not
174 int is_local_reass_enabled;
175 } ip6_full_reass_main_t;
177 extern ip6_full_reass_main_t ip6_full_reass_main;
179 #ifndef CLIB_MARCH_VARIANT
180 ip6_full_reass_main_t ip6_full_reass_main;
181 #endif /* CLIB_MARCH_VARIANT */
185 IP6_FULL_REASSEMBLY_NEXT_INPUT,
186 IP6_FULL_REASSEMBLY_NEXT_DROP,
187 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
188 IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
189 IP6_FULL_REASSEMBLY_N_NEXT,
190 } ip6_full_reass_next_t;
196 ICMP_ERROR_RT_EXCEEDED,
197 ICMP_ERROR_FL_TOO_BIG,
198 ICMP_ERROR_FL_NOT_MULT_8,
202 } ip6_full_reass_trace_operation_e;
212 } ip6_full_reass_range_trace_t;
216 ip6_full_reass_trace_operation_e action;
218 ip6_full_reass_range_trace_t trace_range;
225 bool is_after_handoff;
226 ip6_header_t ip6_header;
227 ip6_frag_hdr_t ip6_frag_header;
228 } ip6_full_reass_trace_t;
231 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
232 ip6_full_reass_range_trace_t * trace)
234 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
235 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
236 trace->range_first = vnb->ip.reass.range_first;
237 trace->range_last = vnb->ip.reass.range_last;
238 trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
239 trace->data_len = ip6_full_reass_buffer_get_data_len (b);
240 trace->range_bi = bi;
244 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
246 ip6_full_reass_range_trace_t *trace =
247 va_arg (*args, ip6_full_reass_range_trace_t *);
249 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
250 trace->range_last, trace->data_offset, trace->data_len,
256 format_ip6_full_reass_trace (u8 * s, va_list * args)
258 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
259 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
260 ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
262 if (~0 != t->reass_id)
264 if (t->is_after_handoff)
267 format (s, "%U\n", format_ip6_header, &t->ip6_header,
268 sizeof (t->ip6_header));
270 format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
271 sizeof (t->ip6_frag_header));
275 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
276 t->reass_id, t->op_id);
277 indent = format_get_indent (s);
278 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
279 t->trace_range.first_bi, t->total_data_len,
280 t->fragment_first, t->fragment_last);
285 s = format (s, "\n%Unew %U", format_white_space, indent,
286 format_ip6_full_reass_range_trace, &t->trace_range);
289 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
290 format_ip6_full_reass_range_trace, &t->trace_range);
292 case ICMP_ERROR_FL_TOO_BIG:
293 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
294 format_white_space, indent,
295 format_ip6_full_reass_range_trace, &t->trace_range);
297 case ICMP_ERROR_FL_NOT_MULT_8:
298 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
299 format_white_space, indent,
300 format_ip6_full_reass_range_trace, &t->trace_range);
302 case ICMP_ERROR_RT_EXCEEDED:
303 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
304 format_white_space, indent);
307 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
311 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
315 s = format (s, "passthrough - not a fragment");
322 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
323 ip6_full_reass_t * reass, u32 bi,
324 ip6_frag_hdr_t * ip6_frag_header,
325 ip6_full_reass_trace_operation_e action,
328 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
329 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
330 bool is_after_handoff = false;
331 if (pool_is_free_index
332 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
334 // this buffer's trace is gone
335 b->flags &= ~VLIB_BUFFER_IS_TRACED;
338 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
340 is_after_handoff = true;
342 ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
343 t->is_after_handoff = is_after_handoff;
344 if (t->is_after_handoff)
346 clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
347 clib_min (sizeof (t->ip6_header), b->current_length));
350 clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
351 sizeof (t->ip6_frag_header));
355 clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
360 t->reass_id = reass->id;
361 t->op_id = reass->trace_op_counter;
362 t->trace_range.first_bi = reass->first_bi;
363 t->total_data_len = reass->data_len;
364 ++reass->trace_op_counter;
371 t->thread_id = vm->thread_index;
372 t->thread_id_to = thread_id_to;
373 ip6_full_reass_trace_details (vm, bi, &t->trace_range);
374 t->fragment_first = vnb->ip.reass.fragment_first;
375 t->fragment_last = vnb->ip.reass.fragment_last;
378 s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
379 printf ("%.*s\n", vec_len (s), s);
381 vec_reset_length (s);
386 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
387 ip6_full_reass_t * reass)
389 pool_put (rt->pool, reass);
394 ip6_full_reass_free (ip6_full_reass_main_t * rm,
395 ip6_full_reass_per_thread_t * rt,
396 ip6_full_reass_t * reass)
398 clib_bihash_kv_48_8_t kv;
399 kv.key[0] = reass->key.as_u64[0];
400 kv.key[1] = reass->key.as_u64[1];
401 kv.key[2] = reass->key.as_u64[2];
402 kv.key[3] = reass->key.as_u64[3];
403 kv.key[4] = reass->key.as_u64[4];
404 kv.key[5] = reass->key.as_u64[5];
405 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
406 ip6_full_reass_free_ctx (rt, reass);
410 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
411 ip6_full_reass_t *reass)
413 u32 range_bi = reass->first_bi;
414 vlib_buffer_t *range_b;
415 vnet_buffer_opaque_t *range_vnb;
417 while (~0 != range_bi)
419 range_b = vlib_get_buffer (vm, range_bi);
420 range_vnb = vnet_buffer (range_b);
424 vec_add1 (to_free, bi);
425 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
426 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
429 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
436 range_bi = range_vnb->ip.reass.next_range_bi;
438 /* send to next_error_index */
439 if (~0 != reass->error_next_index)
441 u32 n_left_to_next, *to_next, next_index;
443 next_index = reass->error_next_index;
446 while (vec_len (to_free) > 0)
448 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
450 while (vec_len (to_free) > 0 && n_left_to_next > 0)
452 bi = vec_pop (to_free);
461 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
466 vlib_buffer_free (vm, to_free, vec_len (to_free));
472 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
473 ip6_full_reass_t * reass, u32 * icmp_bi)
475 if (~0 == reass->first_bi)
479 if (~0 == reass->next_index) // custom apps don't want icmp
481 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
482 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
484 *icmp_bi = reass->first_bi;
485 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
487 ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
488 ICMP_ERROR_RT_EXCEEDED, ~0);
490 // fragment with offset zero received - send icmp message back
491 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
493 // separate first buffer from chain and steer it towards icmp node
494 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
495 reass->first_bi = b->next_buffer;
499 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
501 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
502 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
506 ip6_full_reass_drop_all (vm, node, reass);
509 always_inline ip6_full_reass_t *
510 ip6_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
511 ip6_full_reass_main_t *rm,
512 ip6_full_reass_per_thread_t *rt,
513 ip6_full_reass_kv_t *kv, u32 *icmp_bi,
514 u8 *do_handoff, int skip_bihash)
516 ip6_full_reass_t *reass;
522 now = vlib_time_now (vm);
524 if (!skip_bihash && !clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
526 if (vm->thread_index != kv->v.memory_owner_thread_index)
533 pool_elt_at_index (rm->per_thread_data
534 [kv->v.memory_owner_thread_index].pool,
537 if (now > reass->last_heard + rm->timeout)
539 ip6_full_reass_on_timeout (vm, node, reass, icmp_bi);
540 ip6_full_reass_free (rm, rt, reass);
547 reass->last_heard = now;
551 if (rt->reass_n >= rm->max_reass_n)
558 pool_get (rt->pool, reass);
559 clib_memset (reass, 0, sizeof (*reass));
560 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
562 reass->first_bi = ~0;
563 reass->last_packet_octet = ~0;
565 reass->next_index = ~0;
566 reass->error_next_index = ~0;
567 reass->memory_owner_thread_index = vm->thread_index;
571 kv->v.reass_index = (reass - rt->pool);
572 kv->v.memory_owner_thread_index = vm->thread_index;
573 reass->last_heard = now;
577 reass->key.as_u64[0] = kv->kv.key[0];
578 reass->key.as_u64[1] = kv->kv.key[1];
579 reass->key.as_u64[2] = kv->kv.key[2];
580 reass->key.as_u64[3] = kv->kv.key[3];
581 reass->key.as_u64[4] = kv->kv.key[4];
582 reass->key.as_u64[5] = kv->kv.key[5];
584 int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
587 ip6_full_reass_free (rm, rt, reass);
589 // if other worker created a context already work with the other copy
596 reass->key.as_u64[0] = ~0;
597 reass->key.as_u64[1] = ~0;
598 reass->key.as_u64[2] = ~0;
599 reass->key.as_u64[3] = ~0;
600 reass->key.as_u64[4] = ~0;
601 reass->key.as_u64[5] = ~0;
607 always_inline ip6_full_reass_rc_t
608 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
609 ip6_full_reass_main_t * rm,
610 ip6_full_reass_per_thread_t * rt,
611 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
612 u32 * error0, bool is_custom_app)
614 *bi0 = reass->first_bi;
615 *error0 = IP6_ERROR_NONE;
616 ip6_frag_hdr_t *frag_hdr;
617 vlib_buffer_t *last_b = NULL;
618 u32 sub_chain_bi = reass->first_bi;
619 u32 total_length = 0;
622 u32 *vec_drop_compress = NULL;
623 ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
626 u32 tmp_bi = sub_chain_bi;
627 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
628 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
629 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
630 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
632 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
633 goto free_buffers_and_return;
636 u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
637 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
638 sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
640 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
641 if (tmp_bi == reass->first_bi)
643 /* first buffer - keep ip6 header */
644 if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
646 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
647 goto free_buffers_and_return;
650 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
651 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
653 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
655 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
656 goto free_buffers_and_return;
660 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
666 if (trim_front > tmp->current_length)
668 /* drop whole buffer */
669 vec_add1 (vec_drop_compress, tmp_bi);
670 trim_front -= tmp->current_length;
671 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
673 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
674 goto free_buffers_and_return;
676 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
677 tmp_bi = tmp->next_buffer;
678 tmp = vlib_get_buffer (vm, tmp_bi);
683 vlib_buffer_advance (tmp, trim_front);
691 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
692 last_b->next_buffer = tmp_bi;
695 if (keep_data <= tmp->current_length)
697 tmp->current_length = keep_data;
702 keep_data -= tmp->current_length;
703 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
705 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
706 goto free_buffers_and_return;
709 total_length += tmp->current_length;
713 vec_add1 (vec_drop_compress, tmp_bi);
714 if (reass->first_bi == tmp_bi)
716 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
717 goto free_buffers_and_return;
721 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
723 tmp_bi = tmp->next_buffer;
724 tmp = vlib_get_buffer (vm, tmp->next_buffer);
732 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
735 while (~0 != sub_chain_bi);
739 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
740 goto free_buffers_and_return;
742 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
743 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
744 if (total_length < first_b->current_length)
746 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
747 goto free_buffers_and_return;
749 total_length -= first_b->current_length;
750 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
751 first_b->total_length_not_including_first_buffer = total_length;
752 // drop fragment header
753 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
754 ip6_header_t *ip = vlib_buffer_get_current (first_b);
755 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
756 ip6_ext_hdr_chain_t hdr_chain;
757 ip6_ext_header_t *prev_hdr = 0;
758 int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
761 (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
763 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
764 goto free_buffers_and_return;
766 frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
769 prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
770 prev_hdr->next_hdr = frag_hdr->next_hdr;
774 ip->protocol = frag_hdr->next_hdr;
776 if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
778 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
779 goto free_buffers_and_return;
781 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
782 first_b->current_length - ip6_frag_hdr_offset -
783 sizeof (ip6_frag_hdr_t));
784 first_b->current_length -= sizeof (*frag_hdr);
786 clib_host_to_net_u16 (total_length + first_b->current_length -
788 if (!vlib_buffer_chain_linearize (vm, first_b))
790 rv = IP6_FULL_REASS_RC_NO_BUF;
791 goto free_buffers_and_return;
793 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
794 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
796 ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
799 // following code does a hexdump of packet fragments to stdout ...
802 u32 bi = reass->first_bi;
806 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
807 s = format (s, "%u: %U\n", bi, format_hexdump,
808 vlib_buffer_get_current (b), b->current_length);
809 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
818 printf ("%.*s\n", vec_len (s), s);
827 *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
831 *next0 = reass->next_index;
833 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
834 ip6_full_reass_free (rm, rt, reass);
836 free_buffers_and_return:
837 vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
838 vec_free (vec_drop_compress);
843 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
844 ip6_full_reass_t * reass,
845 u32 prev_range_bi, u32 new_next_bi)
848 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
849 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
850 if (~0 != prev_range_bi)
852 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
853 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
854 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
855 prev_vnb->ip.reass.next_range_bi = new_next_bi;
859 if (~0 != reass->first_bi)
861 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
863 reass->first_bi = new_next_bi;
865 reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
868 always_inline ip6_full_reass_rc_t
869 ip6_full_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
870 ip6_full_reass_main_t *rm,
871 ip6_full_reass_per_thread_t *rt,
872 ip6_full_reass_t *reass, u32 *bi0, u32 *next0,
873 u32 *error0, ip6_frag_hdr_t *frag_hdr,
874 bool is_custom_app, u32 *handoff_thread_idx,
878 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
879 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
882 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
883 reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
886 fvnb->ip.reass.ip6_frag_hdr_offset =
887 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
888 ip6_header_t *fip = vlib_buffer_get_current (fb);
889 if (fb->current_length < sizeof (*fip) ||
890 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
891 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
893 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
896 u32 fragment_first = fvnb->ip.reass.fragment_first =
897 ip6_frag_hdr_offset_bytes (frag_hdr);
898 u32 fragment_length =
899 vlib_buffer_length_in_chain (vm, fb) -
900 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
901 if (0 == fragment_length)
903 return IP6_FULL_REASS_RC_INVALID_FRAG_LEN;
905 u32 fragment_last = fvnb->ip.reass.fragment_last =
906 fragment_first + fragment_length - 1;
907 int more_fragments = ip6_frag_hdr_more (frag_hdr);
908 u32 candidate_range_bi = reass->first_bi;
909 u32 prev_range_bi = ~0;
910 fvnb->ip.reass.range_first = fragment_first;
911 fvnb->ip.reass.range_last = fragment_last;
912 fvnb->ip.reass.next_range_bi = ~0;
915 reass->last_packet_octet = fragment_last;
917 if (~0 == reass->first_bi)
919 // starting a new reassembly
920 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
921 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
923 reass->fragments_n = 1;
924 goto check_if_done_maybe;
926 reass->min_fragment_length =
927 clib_min (clib_net_to_host_u16 (fip->payload_length),
928 fvnb->ip.reass.estimated_mtu);
929 while (~0 != candidate_range_bi)
931 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
932 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
933 if (fragment_first > candidate_vnb->ip.reass.range_last)
935 // this fragments starts after candidate range
936 prev_range_bi = candidate_range_bi;
937 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
938 if (candidate_vnb->ip.reass.range_last < fragment_last &&
939 ~0 == candidate_range_bi)
941 // special case - this fragment falls beyond all known ranges
942 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
949 if (fragment_last < candidate_vnb->ip.reass.range_first)
951 // this fragment ends before candidate range without any overlap
952 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
956 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
957 fragment_last == candidate_vnb->ip.reass.range_last)
959 // duplicate fragment - ignore
963 // overlapping fragment - not allowed by RFC 8200
964 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
966 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
969 ip6_full_reass_drop_all (vm, node, reass);
970 ip6_full_reass_free (rm, rt, reass);
971 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
972 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
973 return IP6_FULL_REASS_RC_OK;
977 ++reass->fragments_n;
981 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
983 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
987 else if (skip_bihash)
989 // if this reassembly is not in bihash, then the packet must have been
991 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
993 if (~0 != reass->last_packet_octet &&
994 reass->data_len == reass->last_packet_octet + 1)
996 *handoff_thread_idx = reass->sendout_thread_index;
998 reass->memory_owner_thread_index != reass->sendout_thread_index;
999 ip6_full_reass_rc_t rc =
1000 ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1002 if (IP6_FULL_REASS_RC_OK == rc && handoff)
1004 return IP6_FULL_REASS_RC_HANDOFF;
1012 // if this reassembly is not in bihash, it should've been an atomic
1013 // fragment and thus finalized
1014 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1019 if (reass->fragments_n > rm->max_reass_len)
1021 return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
1026 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1027 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
1030 return IP6_FULL_REASS_RC_OK;
1034 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
1036 ip6_ext_hdr_chain_t *hc)
1038 int nh = hc->eh[hc->length - 1].protocol;
1039 /* Checking to see if it's a terminating header */
1040 if (ip6_ext_hdr (nh))
1042 icmp6_error_set_vnet_buffer (
1043 b, ICMP6_parameter_problem,
1044 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1045 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1052 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1054 ip6_frag_hdr_t * frag_hdr)
1056 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1057 ip6_header_t *ip = vlib_buffer_get_current (b);
1058 int more_fragments = ip6_frag_hdr_more (frag_hdr);
1059 u32 fragment_length =
1060 vlib_buffer_length_in_chain (vm, b) -
1061 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1062 if (more_fragments && 0 != fragment_length % 8)
1064 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1065 ICMP6_parameter_problem_erroneous_header_field,
1066 (u8 *) & ip->payload_length - (u8 *) ip);
1073 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1075 ip6_frag_hdr_t * frag_hdr)
1077 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1078 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1079 u32 fragment_length =
1080 vlib_buffer_length_in_chain (vm, b) -
1081 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1082 if (fragment_first + fragment_length > 65535)
1084 ip6_header_t *ip0 = vlib_buffer_get_current (b);
1085 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1086 ICMP6_parameter_problem_erroneous_header_field,
1087 (u8 *) & frag_hdr->fragment_offset_and_more
1095 ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1096 vlib_frame_t *frame, bool is_feature,
1097 bool is_custom_app, bool is_local)
1099 u32 *from = vlib_frame_vector_args (frame);
1100 u32 n_left_from, n_left_to_next, *to_next, next_index;
1101 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1102 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1103 clib_spinlock_lock (&rt->lock);
1105 n_left_from = frame->n_vectors;
1106 next_index = node->cached_next_index;
1107 while (n_left_from > 0)
1109 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1111 while (n_left_from > 0 && n_left_to_next > 0)
1115 u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1116 u32 error0 = IP6_ERROR_NONE;
1120 b0 = vlib_get_buffer (vm, bi0);
1122 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1123 ip6_frag_hdr_t *frag_hdr;
1124 ip6_ext_hdr_chain_t hdr_chain;
1125 int res = ip6_ext_header_walk (
1126 b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1128 hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1130 // this is a mangled packet - no fragmentation
1131 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1132 ip6_full_reass_add_trace (vm, node, NULL, bi0, NULL, PASSTHROUGH,
1136 if (is_local && !rm->is_local_reass_enabled)
1138 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1142 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1143 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1144 hdr_chain.eh[res].offset;
1146 if (0 == ip6_frag_hdr_offset (frag_hdr))
1148 // first fragment - verify upper-layer is present
1149 if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1152 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1156 if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1157 !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
1159 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1163 int skip_bihash = 0;
1164 ip6_full_reass_kv_t kv;
1167 if (0 == ip6_frag_hdr_offset (frag_hdr) &&
1168 !ip6_frag_hdr_more (frag_hdr))
1170 // this is atomic fragment and needs to be processed separately
1175 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1176 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1177 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1178 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1180 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1181 vnet_buffer (b0)->sw_if_index[VLIB_RX]))
1183 (u64) frag_hdr->identification;
1184 kv.k.as_u64[5] = ip0->protocol;
1187 ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
1188 vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash);
1192 const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1193 if (0 == fragment_first)
1195 reass->sendout_thread_index = vm->thread_index;
1198 if (PREDICT_FALSE (do_handoff))
1200 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1201 vnet_buffer (b0)->ip.reass.owner_thread_index =
1202 kv.v.memory_owner_thread_index;
1206 u32 handoff_thread_idx;
1208 switch (ip6_full_reass_update (
1209 vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
1210 is_custom_app, &handoff_thread_idx, skip_bihash))
1212 case IP6_FULL_REASS_RC_OK:
1213 /* nothing to do here */
1215 case IP6_FULL_REASS_RC_HANDOFF:
1216 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1217 b0 = vlib_get_buffer (vm, bi0);
1218 vnet_buffer (b0)->ip.reass.owner_thread_index =
1221 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1222 counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1224 case IP6_FULL_REASS_RC_NO_BUF:
1225 counter = IP6_ERROR_REASS_NO_BUF;
1227 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1228 counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1230 case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
1231 counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
1236 vlib_node_increment_counter (vm, node->node_index, counter,
1238 ip6_full_reass_drop_all (vm, node, reass);
1239 ip6_full_reass_free (rm, rt, reass);
1247 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1251 vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1252 next0 = fvnb->ip.reass.error_next_index;
1254 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1262 n_left_to_next -= 1;
1264 /* bi0 might have been updated by reass_finalize, reload */
1265 b0 = vlib_get_buffer (vm, bi0);
1266 if (IP6_ERROR_NONE != error0)
1268 b0->error = node->errors[error0];
1271 if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1273 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1275 ip6_full_reass_add_trace (
1276 vm, node, NULL, bi0, frag_hdr, HANDOFF,
1277 vnet_buffer (b0)->ip.reass.owner_thread_index);
1280 else if (is_feature && IP6_ERROR_NONE == error0)
1282 vnet_feature_next (&next0, b0);
1284 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1285 n_left_to_next, bi0, next0);
1290 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1291 to_next[0] = icmp_bi;
1293 n_left_to_next -= 1;
1294 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1295 n_left_to_next, icmp_bi,
1303 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1306 clib_spinlock_unlock (&rt->lock);
1307 return frame->n_vectors;
1310 static char *ip6_full_reassembly_error_strings[] = {
1311 #define _(sym, string) string,
1316 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1317 vlib_node_runtime_t * node,
1318 vlib_frame_t * frame)
1320 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1321 false /* is_custom_app */,
1322 false /* is_local */);
1325 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1326 .name = "ip6-full-reassembly",
1327 .vector_size = sizeof (u32),
1328 .format_trace = format_ip6_full_reass_trace,
1329 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1330 .error_strings = ip6_full_reassembly_error_strings,
1331 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1334 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1335 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1336 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1337 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1341 VLIB_NODE_FN (ip6_local_full_reass_node)
1342 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1344 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1345 false /* is_custom_app */,
1346 true /* is_local */);
1349 VLIB_REGISTER_NODE (ip6_local_full_reass_node) = {
1350 .name = "ip6-local-full-reassembly",
1351 .vector_size = sizeof (u32),
1352 .format_trace = format_ip6_full_reass_trace,
1353 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1354 .error_strings = ip6_full_reassembly_error_strings,
1355 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1358 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1359 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1360 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1361 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-local-full-reassembly-handoff",
1365 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1366 vlib_node_runtime_t * node,
1367 vlib_frame_t * frame)
1369 return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */,
1370 false /* is_custom_app */,
1371 false /* is_local */);
1374 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1375 .name = "ip6-full-reassembly-feature",
1376 .vector_size = sizeof (u32),
1377 .format_trace = format_ip6_full_reass_trace,
1378 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1379 .error_strings = ip6_full_reassembly_error_strings,
1380 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1383 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1384 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1385 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1386 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1390 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1391 .arc_name = "ip6-unicast",
1392 .node_name = "ip6-full-reassembly-feature",
1393 .runs_before = VNET_FEATURES ("ip6-lookup",
1394 "ipsec6-input-feature"),
1398 #ifndef CLIB_MARCH_VARIANT
1400 ip6_full_reass_get_nbuckets ()
1402 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1406 nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1408 for (i = 0; i < 31; i++)
1409 if ((1 << i) >= nbuckets)
1415 #endif /* CLIB_MARCH_VARIANT */
1419 IP6_EVENT_CONFIG_CHANGED = 1,
1420 } ip6_full_reass_event_t;
1422 #ifndef CLIB_MARCH_VARIANT
1426 clib_bihash_48_8_t *new_hash;
1427 } ip6_rehash_cb_ctx;
1430 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1432 ip6_rehash_cb_ctx *ctx = _ctx;
1433 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1437 return (BIHASH_WALK_CONTINUE);
1441 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1442 u32 max_reassembly_length,
1443 u32 expire_walk_interval_ms)
1445 ip6_full_reass_main.timeout_ms = timeout_ms;
1446 ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1447 ip6_full_reass_main.max_reass_n = max_reassemblies;
1448 ip6_full_reass_main.max_reass_len = max_reassembly_length;
1449 ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1453 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1454 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1456 u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1457 ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1458 max_reassembly_length, expire_walk_interval_ms);
1459 vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1460 ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1461 IP6_EVENT_CONFIG_CHANGED, 0);
1462 u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1463 if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1465 clib_bihash_48_8_t new_hash;
1466 clib_memset (&new_hash, 0, sizeof (new_hash));
1467 ip6_rehash_cb_ctx ctx;
1469 ctx.new_hash = &new_hash;
1470 clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1471 new_nbuckets * 1024);
1472 clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1473 ip6_rehash_cb, &ctx);
1476 clib_bihash_free_48_8 (&new_hash);
1481 clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1482 clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1483 sizeof (ip6_full_reass_main.hash));
1484 clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1491 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1492 u32 * max_reassembly_length,
1493 u32 * expire_walk_interval_ms)
1495 *timeout_ms = ip6_full_reass_main.timeout_ms;
1496 *max_reassemblies = ip6_full_reass_main.max_reass_n;
1497 *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1498 *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1502 static clib_error_t *
1503 ip6_full_reass_init_function (vlib_main_t * vm)
1505 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1506 clib_error_t *error = 0;
1512 vec_validate (rm->per_thread_data, vlib_num_workers ());
1513 ip6_full_reass_per_thread_t *rt;
1514 vec_foreach (rt, rm->per_thread_data)
1516 clib_spinlock_init (&rt->lock);
1517 pool_alloc (rt->pool, rm->max_reass_n);
1520 node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1522 rm->ip6_full_reass_expire_node_idx = node->index;
1524 ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1525 IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1526 IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1527 IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1529 nbuckets = ip6_full_reass_get_nbuckets ();
1530 clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1533 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1535 rm->ip6_drop_idx = node->index;
1536 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1538 rm->ip6_icmp_error_idx = node->index;
1540 if ((error = vlib_call_init_function (vm, ip_main_init)))
1542 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1543 ip6_local_full_reass_node.index);
1544 rm->is_local_reass_enabled = 1;
1546 rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1547 rm->fq_local_index =
1548 vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0);
1549 rm->fq_feature_index =
1550 vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1552 rm->feature_use_refcount_per_intf = NULL;
1556 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1557 #endif /* CLIB_MARCH_VARIANT */
1560 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1561 CLIB_UNUSED (vlib_frame_t *f))
1563 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1564 uword event_type, *event_data = 0;
1568 vlib_process_wait_for_event_or_clock (vm,
1569 (f64) rm->expire_walk_interval_ms
1570 / (f64) MSEC_PER_SEC);
1571 event_type = vlib_process_get_events (vm, &event_data);
1576 /* no events => timeout */
1578 case IP6_EVENT_CONFIG_CHANGED:
1579 /* nothing to do here */
1582 clib_warning ("BUG: event type 0x%wx", event_type);
1585 f64 now = vlib_time_now (vm);
1587 ip6_full_reass_t *reass;
1588 int *pool_indexes_to_free = NULL;
1590 uword thread_index = 0;
1592 const uword nthreads = vlib_num_workers () + 1;
1593 u32 *vec_icmp_bi = NULL;
1594 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1596 ip6_full_reass_per_thread_t *rt =
1597 &rm->per_thread_data[thread_index];
1598 clib_spinlock_lock (&rt->lock);
1600 vec_reset_length (pool_indexes_to_free);
1601 pool_foreach_index (index, rt->pool) {
1602 reass = pool_elt_at_index (rt->pool, index);
1603 if (now > reass->last_heard + rm->timeout)
1605 vec_add1 (pool_indexes_to_free, index);
1609 vec_foreach (i, pool_indexes_to_free)
1611 ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1613 ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1615 vec_add1 (vec_icmp_bi, icmp_bi);
1617 ip6_full_reass_free (rm, rt, reass);
1620 clib_spinlock_unlock (&rt->lock);
1623 while (vec_len (vec_icmp_bi) > 0)
1626 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1627 u32 *to_next = vlib_frame_vector_args (f);
1628 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1629 int trace_frame = 0;
1630 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1632 u32 bi = vec_pop (vec_icmp_bi);
1633 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1634 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1636 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1640 n_left_to_next -= 1;
1642 f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1643 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1646 vec_free (pool_indexes_to_free);
1647 vec_free (vec_icmp_bi);
1650 _vec_len (event_data) = 0;
1657 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1658 .function = ip6_full_reass_walk_expired,
1659 .format_trace = format_ip6_full_reass_trace,
1660 .type = VLIB_NODE_TYPE_PROCESS,
1661 .name = "ip6-full-reassembly-expire-walk",
1663 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1664 .error_strings = ip6_full_reassembly_error_strings,
1669 format_ip6_full_reass_key (u8 * s, va_list * args)
1671 ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1672 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1673 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1674 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1679 format_ip6_full_reass (u8 * s, va_list * args)
1681 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1682 ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1684 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1685 "last_packet_octet: %u, trace_op_counter: %u\n",
1686 reass->id, format_ip6_full_reass_key, &reass->key,
1687 reass->first_bi, reass->data_len, reass->last_packet_octet,
1688 reass->trace_op_counter);
1689 u32 bi = reass->first_bi;
1693 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1694 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1695 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1696 "fragment[%u, %u]\n",
1697 counter, vnb->ip.reass.range_first,
1698 vnb->ip.reass.range_last, bi,
1699 ip6_full_reass_buffer_get_data_offset (b),
1700 ip6_full_reass_buffer_get_data_len (b),
1701 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1702 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1704 bi = b->next_buffer;
1714 static clib_error_t *
1715 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1716 CLIB_UNUSED (vlib_cli_command_t * lmd))
1718 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1720 vlib_cli_output (vm, "---------------------");
1721 vlib_cli_output (vm, "IP6 reassembly status");
1722 vlib_cli_output (vm, "---------------------");
1723 bool details = false;
1724 if (unformat (input, "details"))
1729 u32 sum_reass_n = 0;
1730 u64 sum_buffers_n = 0;
1731 ip6_full_reass_t *reass;
1733 const uword nthreads = vlib_num_workers () + 1;
1734 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1736 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1737 clib_spinlock_lock (&rt->lock);
1740 pool_foreach (reass, rt->pool) {
1741 vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1744 sum_reass_n += rt->reass_n;
1745 clib_spinlock_unlock (&rt->lock);
1747 vlib_cli_output (vm, "---------------------");
1748 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1749 (long unsigned) sum_reass_n);
1750 vlib_cli_output (vm,
1751 "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1752 (long unsigned) rm->max_reass_n);
1753 vlib_cli_output (vm,
1754 "Maximum configured amount of fragments "
1755 "per full IP6 reassembly: %lu\n",
1756 (long unsigned) rm->max_reass_len);
1757 vlib_cli_output (vm,
1758 "Maximum configured full IP6 reassembly timeout: %lums\n",
1759 (long unsigned) rm->timeout_ms);
1760 vlib_cli_output (vm,
1761 "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1762 (long unsigned) rm->expire_walk_interval_ms);
1763 vlib_cli_output (vm, "Buffers in use: %lu\n",
1764 (long unsigned) sum_buffers_n);
1768 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1769 .path = "show ip6-full-reassembly",
1770 .short_help = "show ip6-full-reassembly [details]",
1771 .function = show_ip6_full_reass,
1774 #ifndef CLIB_MARCH_VARIANT
1776 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1778 return vnet_feature_enable_disable ("ip6-unicast",
1779 "ip6-full-reassembly-feature",
1780 sw_if_index, enable_disable, 0, 0);
1782 #endif /* CLIB_MARCH_VARIANT */
1784 #define foreach_ip6_full_reassembly_handoff_error \
1785 _(CONGESTION_DROP, "congestion drop")
1790 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1791 foreach_ip6_full_reassembly_handoff_error
1793 IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1794 } ip6_full_reassembly_handoff_error_t;
1796 static char *ip6_full_reassembly_handoff_error_strings[] = {
1797 #define _(sym,string) string,
1798 foreach_ip6_full_reassembly_handoff_error
1804 u32 next_worker_index;
1805 } ip6_full_reassembly_handoff_trace_t;
1808 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1810 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1811 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1812 ip6_full_reassembly_handoff_trace_t *t =
1813 va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1816 format (s, "ip6-full-reassembly-handoff: next-worker %d",
1817 t->next_worker_index);
1823 ip6_full_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1824 vlib_frame_t *frame, bool is_feature,
1827 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1829 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1830 u32 n_enq, n_left_from, *from;
1831 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1834 from = vlib_frame_vector_args (frame);
1835 n_left_from = frame->n_vectors;
1836 vlib_get_buffers (vm, from, bufs, n_left_from);
1839 ti = thread_indices;
1843 fq_index = rm->fq_feature_index;
1849 fq_index = rm->fq_local_index;
1853 fq_index = rm->fq_index;
1857 while (n_left_from > 0)
1859 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1862 ((node->flags & VLIB_NODE_FLAG_TRACE)
1863 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1865 ip6_full_reassembly_handoff_trace_t *t =
1866 vlib_add_trace (vm, node, b[0], sizeof (*t));
1867 t->next_worker_index = ti[0];
1874 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1875 thread_indices, frame->n_vectors, 1);
1877 if (n_enq < frame->n_vectors)
1878 vlib_node_increment_counter (vm, node->node_index,
1879 IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1880 frame->n_vectors - n_enq);
1881 return frame->n_vectors;
1884 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1885 vlib_node_runtime_t * node,
1886 vlib_frame_t * frame)
1888 return ip6_full_reassembly_handoff_inline (
1889 vm, node, frame, false /* is_feature */, false /* is_local */);
1892 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1893 .name = "ip6-full-reassembly-handoff",
1894 .vector_size = sizeof (u32),
1895 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1896 .error_strings = ip6_full_reassembly_handoff_error_strings,
1897 .format_trace = format_ip6_full_reassembly_handoff_trace,
1906 VLIB_NODE_FN (ip6_local_full_reassembly_handoff_node)
1907 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1909 return ip6_full_reassembly_handoff_inline (
1910 vm, node, frame, false /* is_feature */, true /* is_feature */);
1913 VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = {
1914 .name = "ip6-local-full-reassembly-handoff",
1915 .vector_size = sizeof (u32),
1916 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1917 .error_strings = ip6_full_reassembly_handoff_error_strings,
1918 .format_trace = format_ip6_full_reassembly_handoff_trace,
1927 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1928 vlib_node_runtime_t * node, vlib_frame_t * frame)
1930 return ip6_full_reassembly_handoff_inline (
1931 vm, node, frame, true /* is_feature */, false /* is_local */);
1935 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1936 .name = "ip6-full-reass-feature-hoff",
1937 .vector_size = sizeof (u32),
1938 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1939 .error_strings = ip6_full_reassembly_handoff_error_strings,
1940 .format_trace = format_ip6_full_reassembly_handoff_trace,
1949 #ifndef CLIB_MARCH_VARIANT
1951 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1953 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1954 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1957 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1959 ++rm->feature_use_refcount_per_intf[sw_if_index];
1960 return vnet_feature_enable_disable ("ip6-unicast",
1961 "ip6-full-reassembly-feature",
1962 sw_if_index, 1, 0, 0);
1964 ++rm->feature_use_refcount_per_intf[sw_if_index];
1968 --rm->feature_use_refcount_per_intf[sw_if_index];
1969 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1970 return vnet_feature_enable_disable ("ip6-unicast",
1971 "ip6-full-reassembly-feature",
1972 sw_if_index, 0, 0, 0);
1978 ip6_local_full_reass_enable_disable (int enable)
1982 if (!ip6_full_reass_main.is_local_reass_enabled)
1984 ip6_full_reass_main.is_local_reass_enabled = 1;
1985 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1986 ip6_local_full_reass_node.index);
1991 if (ip6_full_reass_main.is_local_reass_enabled)
1993 ip6_full_reass_main.is_local_reass_enabled = 0;
1994 ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION);
2000 ip6_local_full_reass_enabled ()
2002 return ip6_full_reass_main.is_local_reass_enabled;
2008 * fd.io coding-style-patch-verification: ON
2011 * eval: (c-set-style "gnu")