2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 * @brief IPv6 Full Reassembly.
20 * This file contains the source code for IPv6 full reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vppinfra/bihash_48_8.h>
27 #include <vnet/ip/reass/ip6_full_reass.h>
29 #define MSEC_PER_SEC 1000
30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
39 IP6_FULL_REASS_RC_INTERNAL_ERROR,
40 IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
41 IP6_FULL_REASS_RC_NO_BUF,
42 IP6_FULL_REASS_RC_HANDOFF,
43 } ip6_full_reass_rc_t;
60 } ip6_full_reass_key_t;
67 u32 memory_owner_thread_index;
70 } ip6_full_reass_val_t;
76 ip6_full_reass_key_t k;
77 ip6_full_reass_val_t v;
79 clib_bihash_kv_48_8_t kv;
80 } ip6_full_reass_kv_t;
84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
86 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
87 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
93 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
94 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
95 (vnb->ip.reass.fragment_first +
96 ip6_full_reass_buffer_get_data_offset (b)) + 1;
102 ip6_full_reass_key_t key;
103 // time when last packet was received
105 // internal id of this reassembly
107 // buffer index of first buffer in this reassembly context
109 // last octet of packet, ~0 until fragment without more_fragments arrives
110 u32 last_packet_octet;
111 // length of data collected so far
113 // trace operation counter
114 u32 trace_op_counter;
115 // next index - used by custom apps (~0 if not set)
117 // error next index - used by custom apps (~0 if not set)
118 u32 error_next_index;
119 // minimum fragment length for this reassembly - used to estimate MTU
120 u16 min_fragment_length;
121 // number of fragments for this reassembly
123 // thread owning memory for this context (whose pool contains this ctx)
124 u32 memory_owner_thread_index;
125 // thread which received fragment with offset 0 and which sends out the
126 // completed reassembly
127 u32 sendout_thread_index;
132 ip6_full_reass_t *pool;
135 clib_spinlock_t lock;
136 } ip6_full_reass_per_thread_t;
143 u32 expire_walk_interval_ms;
144 // maximum number of fragments in one reassembly
146 // maximum number of reassemblies
150 clib_bihash_48_8_t hash;
153 ip6_full_reass_per_thread_t *per_thread_data;
156 vlib_main_t *vlib_main;
158 // node index of ip6-drop node
160 u32 ip6_icmp_error_idx;
161 u32 ip6_full_reass_expire_node_idx;
163 /** Worker handoff */
165 u32 fq_feature_index;
167 // reference count for enabling/disabling feature - per interface
168 u32 *feature_use_refcount_per_intf;
169 } ip6_full_reass_main_t;
171 extern ip6_full_reass_main_t ip6_full_reass_main;
173 #ifndef CLIB_MARCH_VARIANT
174 ip6_full_reass_main_t ip6_full_reass_main;
175 #endif /* CLIB_MARCH_VARIANT */
179 IP6_FULL_REASSEMBLY_NEXT_INPUT,
180 IP6_FULL_REASSEMBLY_NEXT_DROP,
181 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
182 IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
183 IP6_FULL_REASSEMBLY_N_NEXT,
184 } ip6_full_reass_next_t;
190 ICMP_ERROR_RT_EXCEEDED,
191 ICMP_ERROR_FL_TOO_BIG,
192 ICMP_ERROR_FL_NOT_MULT_8,
195 } ip6_full_reass_trace_operation_e;
205 } ip6_full_reass_range_trace_t;
209 ip6_full_reass_trace_operation_e action;
211 ip6_full_reass_range_trace_t trace_range;
218 bool is_after_handoff;
219 ip6_header_t ip6_header;
220 ip6_frag_hdr_t ip6_frag_header;
221 } ip6_full_reass_trace_t;
224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
225 ip6_full_reass_range_trace_t * trace)
227 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
228 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
229 trace->range_first = vnb->ip.reass.range_first;
230 trace->range_last = vnb->ip.reass.range_last;
231 trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
232 trace->data_len = ip6_full_reass_buffer_get_data_len (b);
233 trace->range_bi = bi;
237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
239 ip6_full_reass_range_trace_t *trace =
240 va_arg (*args, ip6_full_reass_range_trace_t *);
242 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
243 trace->range_last, trace->data_offset, trace->data_len,
249 format_ip6_full_reass_trace (u8 * s, va_list * args)
251 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
252 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
253 ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
255 if (~0 != t->reass_id)
257 if (t->is_after_handoff)
260 format (s, "%U\n", format_ip6_header, &t->ip6_header,
261 sizeof (t->ip6_header));
263 format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
264 sizeof (t->ip6_frag_header));
268 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
269 t->reass_id, t->op_id);
270 indent = format_get_indent (s);
271 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
272 t->trace_range.first_bi, t->total_data_len,
273 t->fragment_first, t->fragment_last);
278 s = format (s, "\n%Unew %U", format_white_space, indent,
279 format_ip6_full_reass_range_trace, &t->trace_range);
282 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
283 format_ip6_full_reass_range_trace, &t->trace_range);
285 case ICMP_ERROR_FL_TOO_BIG:
286 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
287 format_white_space, indent,
288 format_ip6_full_reass_range_trace, &t->trace_range);
290 case ICMP_ERROR_FL_NOT_MULT_8:
291 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
292 format_white_space, indent,
293 format_ip6_full_reass_range_trace, &t->trace_range);
295 case ICMP_ERROR_RT_EXCEEDED:
296 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
297 format_white_space, indent);
300 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
304 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
313 ip6_full_reass_main_t * rm,
314 ip6_full_reass_t * reass, u32 bi,
315 ip6_frag_hdr_t * ip6_frag_header,
316 ip6_full_reass_trace_operation_e action,
319 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
320 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
321 bool is_after_handoff = false;
322 if (pool_is_free_index
323 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
325 // this buffer's trace is gone
326 b->flags &= ~VLIB_BUFFER_IS_TRACED;
329 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
331 is_after_handoff = true;
333 ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
334 t->is_after_handoff = is_after_handoff;
335 if (t->is_after_handoff)
337 clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
338 clib_min (sizeof (t->ip6_header), b->current_length));
341 clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
342 sizeof (t->ip6_frag_header));
346 clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
351 t->reass_id = reass->id;
352 t->op_id = reass->trace_op_counter;
353 t->trace_range.first_bi = reass->first_bi;
354 t->total_data_len = reass->data_len;
355 ++reass->trace_op_counter;
362 t->thread_id = vm->thread_index;
363 t->thread_id_to = thread_id_to;
364 ip6_full_reass_trace_details (vm, bi, &t->trace_range);
365 t->fragment_first = vnb->ip.reass.fragment_first;
366 t->fragment_last = vnb->ip.reass.fragment_last;
369 s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
370 printf ("%.*s\n", vec_len (s), s);
372 vec_reset_length (s);
377 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
378 ip6_full_reass_t * reass)
380 pool_put (rt->pool, reass);
385 ip6_full_reass_free (ip6_full_reass_main_t * rm,
386 ip6_full_reass_per_thread_t * rt,
387 ip6_full_reass_t * reass)
389 clib_bihash_kv_48_8_t kv;
390 kv.key[0] = reass->key.as_u64[0];
391 kv.key[1] = reass->key.as_u64[1];
392 kv.key[2] = reass->key.as_u64[2];
393 kv.key[3] = reass->key.as_u64[3];
394 kv.key[4] = reass->key.as_u64[4];
395 kv.key[5] = reass->key.as_u64[5];
396 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
397 ip6_full_reass_free_ctx (rt, reass);
401 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
402 ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
404 u32 range_bi = reass->first_bi;
405 vlib_buffer_t *range_b;
406 vnet_buffer_opaque_t *range_vnb;
408 while (~0 != range_bi)
410 range_b = vlib_get_buffer (vm, range_bi);
411 range_vnb = vnet_buffer (range_b);
415 vec_add1 (to_free, bi);
416 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
417 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
420 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
427 range_bi = range_vnb->ip.reass.next_range_bi;
429 /* send to next_error_index */
430 if (~0 != reass->error_next_index)
432 u32 n_left_to_next, *to_next, next_index;
434 next_index = reass->error_next_index;
437 while (vec_len (to_free) > 0)
439 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
441 while (vec_len (to_free) > 0 && n_left_to_next > 0)
443 bi = vec_pop (to_free);
452 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
457 vlib_buffer_free (vm, to_free, vec_len (to_free));
463 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
464 ip6_full_reass_main_t * rm,
465 ip6_full_reass_t * reass, u32 * icmp_bi)
467 if (~0 == reass->first_bi)
471 if (~0 == reass->next_index) // custom apps don't want icmp
473 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
474 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
476 *icmp_bi = reass->first_bi;
477 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
479 ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
480 NULL, ICMP_ERROR_RT_EXCEEDED, ~0);
482 // fragment with offset zero received - send icmp message back
483 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
485 // separate first buffer from chain and steer it towards icmp node
486 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
487 reass->first_bi = b->next_buffer;
491 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
493 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
494 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
498 ip6_full_reass_drop_all (vm, node, rm, reass);
501 always_inline ip6_full_reass_t *
502 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
503 ip6_full_reass_main_t * rm,
504 ip6_full_reass_per_thread_t * rt,
505 ip6_full_reass_kv_t * kv, u32 * icmp_bi,
508 ip6_full_reass_t *reass;
514 now = vlib_time_now (vm);
516 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
518 if (vm->thread_index != kv->v.memory_owner_thread_index)
525 pool_elt_at_index (rm->per_thread_data
526 [kv->v.memory_owner_thread_index].pool,
529 if (now > reass->last_heard + rm->timeout)
531 ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
532 ip6_full_reass_free (rm, rt, reass);
539 reass->last_heard = now;
543 if (rt->reass_n >= rm->max_reass_n)
550 pool_get (rt->pool, reass);
551 clib_memset (reass, 0, sizeof (*reass));
552 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
554 reass->first_bi = ~0;
555 reass->last_packet_octet = ~0;
557 reass->next_index = ~0;
558 reass->error_next_index = ~0;
562 reass->key.as_u64[0] = kv->kv.key[0];
563 reass->key.as_u64[1] = kv->kv.key[1];
564 reass->key.as_u64[2] = kv->kv.key[2];
565 reass->key.as_u64[3] = kv->kv.key[3];
566 reass->key.as_u64[4] = kv->kv.key[4];
567 reass->key.as_u64[5] = kv->kv.key[5];
568 kv->v.reass_index = (reass - rt->pool);
569 kv->v.memory_owner_thread_index = vm->thread_index;
570 reass->last_heard = now;
572 int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
575 ip6_full_reass_free (rm, rt, reass);
577 // if other worker created a context already work with the other copy
585 always_inline ip6_full_reass_rc_t
586 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
587 ip6_full_reass_main_t * rm,
588 ip6_full_reass_per_thread_t * rt,
589 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
590 u32 * error0, bool is_custom_app)
592 *bi0 = reass->first_bi;
593 *error0 = IP6_ERROR_NONE;
594 ip6_frag_hdr_t *frag_hdr;
595 vlib_buffer_t *last_b = NULL;
596 u32 sub_chain_bi = reass->first_bi;
597 u32 total_length = 0;
600 u32 *vec_drop_compress = NULL;
601 ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
604 u32 tmp_bi = sub_chain_bi;
605 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
606 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
607 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
608 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
610 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
611 goto free_buffers_and_return;
614 u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
615 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
616 sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
618 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
619 if (tmp_bi == reass->first_bi)
621 /* first buffer - keep ip6 header */
622 if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
624 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
625 goto free_buffers_and_return;
628 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
629 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
631 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
633 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
634 goto free_buffers_and_return;
638 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
644 if (trim_front > tmp->current_length)
646 /* drop whole buffer */
647 vec_add1 (vec_drop_compress, tmp_bi);
648 trim_front -= tmp->current_length;
649 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
651 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
652 goto free_buffers_and_return;
654 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
655 tmp_bi = tmp->next_buffer;
656 tmp = vlib_get_buffer (vm, tmp_bi);
661 vlib_buffer_advance (tmp, trim_front);
669 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
670 last_b->next_buffer = tmp_bi;
673 if (keep_data <= tmp->current_length)
675 tmp->current_length = keep_data;
680 keep_data -= tmp->current_length;
681 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
683 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
684 goto free_buffers_and_return;
687 total_length += tmp->current_length;
691 vec_add1 (vec_drop_compress, tmp_bi);
692 if (reass->first_bi == tmp_bi)
694 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
695 goto free_buffers_and_return;
699 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
701 tmp_bi = tmp->next_buffer;
702 tmp = vlib_get_buffer (vm, tmp->next_buffer);
710 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
713 while (~0 != sub_chain_bi);
717 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
718 goto free_buffers_and_return;
720 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
721 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
722 if (total_length < first_b->current_length)
724 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
725 goto free_buffers_and_return;
727 total_length -= first_b->current_length;
728 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
729 first_b->total_length_not_including_first_buffer = total_length;
730 // drop fragment header
731 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
732 ip6_header_t *ip = vlib_buffer_get_current (first_b);
733 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
734 ip6_ext_header_t *prev_hdr;
736 ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
740 prev_hdr->next_hdr = frag_hdr->next_hdr;
744 ip->protocol = frag_hdr->next_hdr;
746 if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
748 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
749 goto free_buffers_and_return;
751 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
752 first_b->current_length - ip6_frag_hdr_offset -
753 sizeof (ip6_frag_hdr_t));
754 first_b->current_length -= sizeof (*frag_hdr);
756 clib_host_to_net_u16 (total_length + first_b->current_length -
758 if (!vlib_buffer_chain_linearize (vm, first_b))
760 rv = IP6_FULL_REASS_RC_NO_BUF;
761 goto free_buffers_and_return;
763 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
764 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
766 ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, NULL,
769 // following code does a hexdump of packet fragments to stdout ...
772 u32 bi = reass->first_bi;
776 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
777 s = format (s, "%u: %U\n", bi, format_hexdump,
778 vlib_buffer_get_current (b), b->current_length);
779 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
788 printf ("%.*s\n", vec_len (s), s);
797 *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
801 *next0 = reass->next_index;
803 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
804 ip6_full_reass_free (rm, rt, reass);
806 free_buffers_and_return:
807 vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
808 vec_free (vec_drop_compress);
813 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
814 ip6_full_reass_main_t * rm,
815 ip6_full_reass_per_thread_t * rt,
816 ip6_full_reass_t * reass,
817 u32 prev_range_bi, u32 new_next_bi)
820 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
821 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
822 if (~0 != prev_range_bi)
824 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
825 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
826 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
827 prev_vnb->ip.reass.next_range_bi = new_next_bi;
831 if (~0 != reass->first_bi)
833 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
835 reass->first_bi = new_next_bi;
837 reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
840 always_inline ip6_full_reass_rc_t
841 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
842 ip6_full_reass_main_t * rm,
843 ip6_full_reass_per_thread_t * rt,
844 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
845 u32 * error0, ip6_frag_hdr_t * frag_hdr,
846 bool is_custom_app, u32 * handoff_thread_idx)
849 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
850 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
853 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
854 reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
857 fvnb->ip.reass.ip6_frag_hdr_offset =
858 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
859 ip6_header_t *fip = vlib_buffer_get_current (fb);
860 if (fb->current_length < sizeof (*fip) ||
861 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
862 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
864 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
867 u32 fragment_first = fvnb->ip.reass.fragment_first =
868 ip6_frag_hdr_offset_bytes (frag_hdr);
869 u32 fragment_length =
870 vlib_buffer_length_in_chain (vm, fb) -
871 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
872 u32 fragment_last = fvnb->ip.reass.fragment_last =
873 fragment_first + fragment_length - 1;
874 int more_fragments = ip6_frag_hdr_more (frag_hdr);
875 u32 candidate_range_bi = reass->first_bi;
876 u32 prev_range_bi = ~0;
877 fvnb->ip.reass.range_first = fragment_first;
878 fvnb->ip.reass.range_last = fragment_last;
879 fvnb->ip.reass.next_range_bi = ~0;
882 reass->last_packet_octet = fragment_last;
884 if (~0 == reass->first_bi)
886 // starting a new reassembly
887 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
889 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
891 reass->fragments_n = 1;
892 goto check_if_done_maybe;
894 reass->min_fragment_length =
895 clib_min (clib_net_to_host_u16 (fip->payload_length),
896 fvnb->ip.reass.estimated_mtu);
897 while (~0 != candidate_range_bi)
899 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
900 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
901 if (fragment_first > candidate_vnb->ip.reass.range_last)
903 // this fragments starts after candidate range
904 prev_range_bi = candidate_range_bi;
905 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
906 if (candidate_vnb->ip.reass.range_last < fragment_last &&
907 ~0 == candidate_range_bi)
909 // special case - this fragment falls beyond all known ranges
910 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
911 prev_range_bi, *bi0);
917 if (fragment_last < candidate_vnb->ip.reass.range_first)
919 // this fragment ends before candidate range without any overlap
920 ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
921 prev_range_bi, *bi0);
924 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
925 fragment_last == candidate_vnb->ip.reass.range_last)
927 // duplicate fragment - ignore
931 // overlapping fragment - not allowed by RFC 8200
932 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
934 ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
937 ip6_full_reass_drop_all (vm, node, rm, reass);
938 ip6_full_reass_free (rm, rt, reass);
939 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
940 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
941 return IP6_FULL_REASS_RC_OK;
945 ++reass->fragments_n;
949 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
951 ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
955 if (~0 != reass->last_packet_octet &&
956 reass->data_len == reass->last_packet_octet + 1)
958 *handoff_thread_idx = reass->sendout_thread_index;
960 reass->memory_owner_thread_index != reass->sendout_thread_index;
961 ip6_full_reass_rc_t rc =
962 ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
964 if (IP6_FULL_REASS_RC_OK == rc && handoff)
966 return IP6_FULL_REASS_RC_HANDOFF;
975 if (reass->fragments_n > rm->max_reass_len)
977 return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
982 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
983 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
986 return IP6_FULL_REASS_RC_OK;
990 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
992 ip6_frag_hdr_t * frag_hdr)
994 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
995 while (ip6_ext_hdr (tmp->next_hdr))
997 tmp = ip6_ext_next_header (tmp);
999 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
1001 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1002 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
1004 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1012 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1013 vlib_node_runtime_t * node,
1015 ip6_frag_hdr_t * frag_hdr)
1017 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1018 ip6_header_t *ip = vlib_buffer_get_current (b);
1019 int more_fragments = ip6_frag_hdr_more (frag_hdr);
1020 u32 fragment_length =
1021 vlib_buffer_length_in_chain (vm, b) -
1022 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1023 if (more_fragments && 0 != fragment_length % 8)
1025 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1026 ICMP6_parameter_problem_erroneous_header_field,
1027 (u8 *) & ip->payload_length - (u8 *) ip);
1034 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1035 vlib_node_runtime_t * node,
1037 ip6_frag_hdr_t * frag_hdr)
1039 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1040 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1041 u32 fragment_length =
1042 vlib_buffer_length_in_chain (vm, b) -
1043 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1044 if (fragment_first + fragment_length > 65535)
1046 ip6_header_t *ip0 = vlib_buffer_get_current (b);
1047 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1048 ICMP6_parameter_problem_erroneous_header_field,
1049 (u8 *) & frag_hdr->fragment_offset_and_more
1057 ip6_full_reassembly_inline (vlib_main_t * vm,
1058 vlib_node_runtime_t * node,
1059 vlib_frame_t * frame, bool is_feature,
1062 u32 *from = vlib_frame_vector_args (frame);
1063 u32 n_left_from, n_left_to_next, *to_next, next_index;
1064 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1065 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1066 clib_spinlock_lock (&rt->lock);
1068 n_left_from = frame->n_vectors;
1069 next_index = node->cached_next_index;
1070 while (n_left_from > 0)
1072 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1074 while (n_left_from > 0 && n_left_to_next > 0)
1078 u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1079 u32 error0 = IP6_ERROR_NONE;
1083 b0 = vlib_get_buffer (vm, bi0);
1085 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1086 ip6_frag_hdr_t *frag_hdr = NULL;
1087 ip6_ext_header_t *prev_hdr;
1088 if (ip6_ext_hdr (ip0->protocol))
1091 ip6_ext_header_find (vm, b0, ip0,
1092 IP_PROTOCOL_IPV6_FRAGMENTATION,
1097 // this is a regular packet - no fragmentation
1098 next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1101 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1102 (u8 *) frag_hdr - (u8 *) ip0;
1104 if (0 == ip6_frag_hdr_offset (frag_hdr))
1106 // first fragment - verify upper-layer is present
1107 if (!ip6_full_reass_verify_upper_layer_present
1108 (node, b0, frag_hdr))
1110 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1114 if (!ip6_full_reass_verify_fragment_multiple_8
1115 (vm, node, b0, frag_hdr)
1116 || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1119 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1122 ip6_full_reass_kv_t kv;
1125 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1126 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1127 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1128 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1130 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1131 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1132 (u64) frag_hdr->identification;
1133 kv.k.as_u64[5] = ip0->protocol;
1135 ip6_full_reass_t *reass =
1136 ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1141 const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1142 if (0 == fragment_first)
1144 reass->sendout_thread_index = vm->thread_index;
1147 if (PREDICT_FALSE (do_handoff))
1149 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1150 vnet_buffer (b0)->ip.reass.owner_thread_index =
1151 kv.v.memory_owner_thread_index;
1155 u32 handoff_thread_idx;
1156 switch (ip6_full_reass_update
1157 (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1158 frag_hdr, is_custom_app, &handoff_thread_idx))
1160 case IP6_FULL_REASS_RC_OK:
1161 /* nothing to do here */
1163 case IP6_FULL_REASS_RC_HANDOFF:
1164 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1165 b0 = vlib_get_buffer (vm, bi0);
1166 vnet_buffer (b0)->ip.reass.owner_thread_index =
1169 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1170 vlib_node_increment_counter (vm, node->node_index,
1171 IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1173 ip6_full_reass_drop_all (vm, node, rm, reass);
1174 ip6_full_reass_free (rm, rt, reass);
1177 case IP6_FULL_REASS_RC_NO_BUF:
1178 vlib_node_increment_counter (vm, node->node_index,
1179 IP6_ERROR_REASS_NO_BUF, 1);
1180 ip6_full_reass_drop_all (vm, node, rm, reass);
1181 ip6_full_reass_free (rm, rt, reass);
1184 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1185 vlib_node_increment_counter (vm, node->node_index,
1186 IP6_ERROR_REASS_INTERNAL_ERROR,
1188 ip6_full_reass_drop_all (vm, node, rm, reass);
1189 ip6_full_reass_free (rm, rt, reass);
1198 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1202 vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1203 next0 = fvnb->ip.reass.error_next_index;
1205 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1213 n_left_to_next -= 1;
1215 /* bi0 might have been updated by reass_finalize, reload */
1216 b0 = vlib_get_buffer (vm, bi0);
1217 if (IP6_ERROR_NONE != error0)
1219 b0->error = node->errors[error0];
1222 if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1224 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1226 ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1228 vnet_buffer (b0)->ip.
1229 reass.owner_thread_index);
1232 else if (is_feature && IP6_ERROR_NONE == error0)
1234 vnet_feature_next (&next0, b0);
1236 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1237 n_left_to_next, bi0, next0);
1242 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1243 to_next[0] = icmp_bi;
1245 n_left_to_next -= 1;
1246 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1247 n_left_to_next, icmp_bi,
1255 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1258 clib_spinlock_unlock (&rt->lock);
1259 return frame->n_vectors;
1262 static char *ip6_full_reassembly_error_strings[] = {
1263 #define _(sym, string) string,
1268 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1269 vlib_node_runtime_t * node,
1270 vlib_frame_t * frame)
1272 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1273 false /* is_custom_app */ );
1277 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1278 .name = "ip6-full-reassembly",
1279 .vector_size = sizeof (u32),
1280 .format_trace = format_ip6_full_reass_trace,
1281 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1282 .error_strings = ip6_full_reassembly_error_strings,
1283 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1286 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1287 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1288 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1289 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1294 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1295 vlib_node_runtime_t * node,
1296 vlib_frame_t * frame)
1298 return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1299 false /* is_custom_app */ );
1303 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1304 .name = "ip6-full-reassembly-feature",
1305 .vector_size = sizeof (u32),
1306 .format_trace = format_ip6_full_reass_trace,
1307 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1308 .error_strings = ip6_full_reassembly_error_strings,
1309 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1312 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1313 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1314 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1315 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1321 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1322 .arc_name = "ip6-unicast",
1323 .node_name = "ip6-full-reassembly-feature",
1324 .runs_before = VNET_FEATURES ("ip6-lookup",
1325 "ipsec6-input-feature"),
1330 #ifndef CLIB_MARCH_VARIANT
1332 ip6_full_reass_get_nbuckets ()
1334 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1338 nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1340 for (i = 0; i < 31; i++)
1341 if ((1 << i) >= nbuckets)
1347 #endif /* CLIB_MARCH_VARIANT */
1351 IP6_EVENT_CONFIG_CHANGED = 1,
1352 } ip6_full_reass_event_t;
1354 #ifndef CLIB_MARCH_VARIANT
1358 clib_bihash_48_8_t *new_hash;
1359 } ip6_rehash_cb_ctx;
1362 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1364 ip6_rehash_cb_ctx *ctx = _ctx;
1365 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1369 return (BIHASH_WALK_CONTINUE);
1373 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1374 u32 max_reassembly_length,
1375 u32 expire_walk_interval_ms)
1377 ip6_full_reass_main.timeout_ms = timeout_ms;
1378 ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1379 ip6_full_reass_main.max_reass_n = max_reassemblies;
1380 ip6_full_reass_main.max_reass_len = max_reassembly_length;
1381 ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1385 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1386 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1388 u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1389 ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1390 max_reassembly_length, expire_walk_interval_ms);
1391 vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1392 ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1393 IP6_EVENT_CONFIG_CHANGED, 0);
1394 u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1395 if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1397 clib_bihash_48_8_t new_hash;
1398 clib_memset (&new_hash, 0, sizeof (new_hash));
1399 ip6_rehash_cb_ctx ctx;
1401 ctx.new_hash = &new_hash;
1402 clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1403 new_nbuckets * 1024);
1404 clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1405 ip6_rehash_cb, &ctx);
1408 clib_bihash_free_48_8 (&new_hash);
1413 clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1414 clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1415 sizeof (ip6_full_reass_main.hash));
1416 clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1423 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1424 u32 * max_reassembly_length,
1425 u32 * expire_walk_interval_ms)
1427 *timeout_ms = ip6_full_reass_main.timeout_ms;
1428 *max_reassemblies = ip6_full_reass_main.max_reass_n;
1429 *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1430 *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1434 static clib_error_t *
1435 ip6_full_reass_init_function (vlib_main_t * vm)
1437 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1438 clib_error_t *error = 0;
1444 vec_validate (rm->per_thread_data, vlib_num_workers ());
1445 ip6_full_reass_per_thread_t *rt;
1446 vec_foreach (rt, rm->per_thread_data)
1448 clib_spinlock_init (&rt->lock);
1449 pool_alloc (rt->pool, rm->max_reass_n);
1452 node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1454 rm->ip6_full_reass_expire_node_idx = node->index;
1456 ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1457 IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1458 IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1459 IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1461 nbuckets = ip6_full_reass_get_nbuckets ();
1462 clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1465 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1467 rm->ip6_drop_idx = node->index;
1468 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1470 rm->ip6_icmp_error_idx = node->index;
1472 if ((error = vlib_call_init_function (vm, ip_main_init)))
1474 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1475 ip6_full_reass_node.index);
1477 rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1478 rm->fq_feature_index =
1479 vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1481 rm->feature_use_refcount_per_intf = NULL;
1485 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1486 #endif /* CLIB_MARCH_VARIANT */
1489 ip6_full_reass_walk_expired (vlib_main_t * vm,
1490 vlib_node_runtime_t * node, vlib_frame_t * f)
1492 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1493 uword event_type, *event_data = 0;
1497 vlib_process_wait_for_event_or_clock (vm,
1498 (f64) rm->expire_walk_interval_ms
1499 / (f64) MSEC_PER_SEC);
1500 event_type = vlib_process_get_events (vm, &event_data);
1504 case ~0: /* no events => timeout */
1505 /* nothing to do here */
1507 case IP6_EVENT_CONFIG_CHANGED:
1510 clib_warning ("BUG: event type 0x%wx", event_type);
1513 f64 now = vlib_time_now (vm);
1515 ip6_full_reass_t *reass;
1516 int *pool_indexes_to_free = NULL;
1518 uword thread_index = 0;
1520 const uword nthreads = vlib_num_workers () + 1;
1521 u32 *vec_icmp_bi = NULL;
1522 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1524 ip6_full_reass_per_thread_t *rt =
1525 &rm->per_thread_data[thread_index];
1526 clib_spinlock_lock (&rt->lock);
1528 vec_reset_length (pool_indexes_to_free);
1530 pool_foreach_index (index, rt->pool) {
1531 reass = pool_elt_at_index (rt->pool, index);
1532 if (now > reass->last_heard + rm->timeout)
1534 vec_add1 (pool_indexes_to_free, index);
1540 vec_foreach (i, pool_indexes_to_free)
1542 ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1544 ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1546 vec_add1 (vec_icmp_bi, icmp_bi);
1548 ip6_full_reass_free (rm, rt, reass);
1552 clib_spinlock_unlock (&rt->lock);
1555 while (vec_len (vec_icmp_bi) > 0)
1558 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1559 u32 *to_next = vlib_frame_vector_args (f);
1560 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1561 int trace_frame = 0;
1562 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1564 u32 bi = vec_pop (vec_icmp_bi);
1565 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1566 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1568 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1572 n_left_to_next -= 1;
1574 f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1575 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1578 vec_free (pool_indexes_to_free);
1579 vec_free (vec_icmp_bi);
1582 _vec_len (event_data) = 0;
1590 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1591 .function = ip6_full_reass_walk_expired,
1592 .format_trace = format_ip6_full_reass_trace,
1593 .type = VLIB_NODE_TYPE_PROCESS,
1594 .name = "ip6-full-reassembly-expire-walk",
1596 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1597 .error_strings = ip6_full_reassembly_error_strings,
1603 format_ip6_full_reass_key (u8 * s, va_list * args)
1605 ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1606 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1607 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1608 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1613 format_ip6_full_reass (u8 * s, va_list * args)
1615 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1616 ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1618 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1619 "last_packet_octet: %u, trace_op_counter: %u\n",
1620 reass->id, format_ip6_full_reass_key, &reass->key,
1621 reass->first_bi, reass->data_len, reass->last_packet_octet,
1622 reass->trace_op_counter);
1623 u32 bi = reass->first_bi;
1627 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1628 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1629 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1630 "fragment[%u, %u]\n",
1631 counter, vnb->ip.reass.range_first,
1632 vnb->ip.reass.range_last, bi,
1633 ip6_full_reass_buffer_get_data_offset (b),
1634 ip6_full_reass_buffer_get_data_len (b),
1635 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1636 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1638 bi = b->next_buffer;
1648 static clib_error_t *
1649 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1650 CLIB_UNUSED (vlib_cli_command_t * lmd))
1652 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1654 vlib_cli_output (vm, "---------------------");
1655 vlib_cli_output (vm, "IP6 reassembly status");
1656 vlib_cli_output (vm, "---------------------");
1657 bool details = false;
1658 if (unformat (input, "details"))
1663 u32 sum_reass_n = 0;
1664 u64 sum_buffers_n = 0;
1665 ip6_full_reass_t *reass;
1667 const uword nthreads = vlib_num_workers () + 1;
1668 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1670 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1671 clib_spinlock_lock (&rt->lock);
1675 pool_foreach (reass, rt->pool) {
1676 vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1680 sum_reass_n += rt->reass_n;
1681 clib_spinlock_unlock (&rt->lock);
1683 vlib_cli_output (vm, "---------------------");
1684 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1685 (long unsigned) sum_reass_n);
1686 vlib_cli_output (vm,
1687 "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1688 (long unsigned) rm->max_reass_n);
1689 vlib_cli_output (vm,
1690 "Maximum configured full IP6 reassembly timeout: %lums\n",
1691 (long unsigned) rm->timeout_ms);
1692 vlib_cli_output (vm,
1693 "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1694 (long unsigned) rm->expire_walk_interval_ms);
1695 vlib_cli_output (vm, "Buffers in use: %lu\n",
1696 (long unsigned) sum_buffers_n);
1701 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1702 .path = "show ip6-full-reassembly",
1703 .short_help = "show ip6-full-reassembly [details]",
1704 .function = show_ip6_full_reass,
1708 #ifndef CLIB_MARCH_VARIANT
1710 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1712 return vnet_feature_enable_disable ("ip6-unicast",
1713 "ip6-full-reassembly-feature",
1714 sw_if_index, enable_disable, 0, 0);
1716 #endif /* CLIB_MARCH_VARIANT */
1718 #define foreach_ip6_full_reassembly_handoff_error \
1719 _(CONGESTION_DROP, "congestion drop")
1724 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1725 foreach_ip6_full_reassembly_handoff_error
1727 IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1728 } ip6_full_reassembly_handoff_error_t;
1730 static char *ip6_full_reassembly_handoff_error_strings[] = {
1731 #define _(sym,string) string,
1732 foreach_ip6_full_reassembly_handoff_error
1738 u32 next_worker_index;
1739 } ip6_full_reassembly_handoff_trace_t;
1742 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1744 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1745 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1746 ip6_full_reassembly_handoff_trace_t *t =
1747 va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1750 format (s, "ip6-full-reassembly-handoff: next-worker %d",
1751 t->next_worker_index);
1757 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1758 vlib_node_runtime_t * node,
1759 vlib_frame_t * frame, bool is_feature)
1761 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1763 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1764 u32 n_enq, n_left_from, *from;
1765 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1768 from = vlib_frame_vector_args (frame);
1769 n_left_from = frame->n_vectors;
1770 vlib_get_buffers (vm, from, bufs, n_left_from);
1773 ti = thread_indices;
1775 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1777 while (n_left_from > 0)
1779 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1782 ((node->flags & VLIB_NODE_FLAG_TRACE)
1783 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1785 ip6_full_reassembly_handoff_trace_t *t =
1786 vlib_add_trace (vm, node, b[0], sizeof (*t));
1787 t->next_worker_index = ti[0];
1795 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1796 frame->n_vectors, 1);
1798 if (n_enq < frame->n_vectors)
1799 vlib_node_increment_counter (vm, node->node_index,
1800 IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1801 frame->n_vectors - n_enq);
1802 return frame->n_vectors;
1805 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1806 vlib_node_runtime_t * node,
1807 vlib_frame_t * frame)
1809 return ip6_full_reassembly_handoff_inline (vm, node, frame,
1810 false /* is_feature */ );
1814 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1815 .name = "ip6-full-reassembly-handoff",
1816 .vector_size = sizeof (u32),
1817 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1818 .error_strings = ip6_full_reassembly_handoff_error_strings,
1819 .format_trace = format_ip6_full_reassembly_handoff_trace,
1829 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1830 vlib_node_runtime_t * node, vlib_frame_t * frame)
1832 return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1837 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1838 .name = "ip6-full-reass-feature-hoff",
1839 .vector_size = sizeof (u32),
1840 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1841 .error_strings = ip6_full_reassembly_handoff_error_strings,
1842 .format_trace = format_ip6_full_reassembly_handoff_trace,
1852 #ifndef CLIB_MARCH_VARIANT
1854 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1856 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1857 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1860 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1862 ++rm->feature_use_refcount_per_intf[sw_if_index];
1863 return vnet_feature_enable_disable ("ip6-unicast",
1864 "ip6-full-reassembly-feature",
1865 sw_if_index, 1, 0, 0);
1867 ++rm->feature_use_refcount_per_intf[sw_if_index];
1871 --rm->feature_use_refcount_per_intf[sw_if_index];
1872 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1873 return vnet_feature_enable_disable ("ip6-unicast",
1874 "ip6-full-reassembly-feature",
1875 sw_if_index, 0, 0, 0);
1882 * fd.io coding-style-patch-verification: ON
1885 * eval: (c-set-style "gnu")