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_t;
61 } ip6_full_reass_key_t;
68 u32 memory_owner_thread_index;
71 } ip6_full_reass_val_t;
77 ip6_full_reass_key_t k;
78 ip6_full_reass_val_t v;
80 clib_bihash_kv_48_8_t kv;
81 } ip6_full_reass_kv_t;
85 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
87 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
88 return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
92 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
94 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
95 return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
96 (vnb->ip.reass.fragment_first +
97 ip6_full_reass_buffer_get_data_offset (b)) + 1;
103 ip6_full_reass_key_t key;
104 // time when last packet was received
106 // internal id of this reassembly
108 // buffer index of first buffer in this reassembly context
110 // last octet of packet, ~0 until fragment without more_fragments arrives
111 u32 last_packet_octet;
112 // length of data collected so far
114 // trace operation counter
115 u32 trace_op_counter;
116 // next index - used by custom apps (~0 if not set)
118 // error next index - used by custom apps (~0 if not set)
119 u32 error_next_index;
120 // minimum fragment length for this reassembly - used to estimate MTU
121 u16 min_fragment_length;
122 // number of fragments for this reassembly
124 // thread owning memory for this context (whose pool contains this ctx)
125 u32 memory_owner_thread_index;
126 // thread which received fragment with offset 0 and which sends out the
127 // completed reassembly
128 u32 sendout_thread_index;
133 ip6_full_reass_t *pool;
136 clib_spinlock_t lock;
137 } ip6_full_reass_per_thread_t;
144 u32 expire_walk_interval_ms;
145 // maximum number of fragments in one reassembly
147 // maximum number of reassemblies
151 clib_bihash_48_8_t hash;
154 ip6_full_reass_per_thread_t *per_thread_data;
157 vlib_main_t *vlib_main;
159 // node index of ip6-drop node
161 u32 ip6_icmp_error_idx;
162 u32 ip6_full_reass_expire_node_idx;
164 /** Worker handoff */
166 u32 fq_feature_index;
168 // reference count for enabling/disabling feature - per interface
169 u32 *feature_use_refcount_per_intf;
170 } ip6_full_reass_main_t;
172 extern ip6_full_reass_main_t ip6_full_reass_main;
174 #ifndef CLIB_MARCH_VARIANT
175 ip6_full_reass_main_t ip6_full_reass_main;
176 #endif /* CLIB_MARCH_VARIANT */
180 IP6_FULL_REASSEMBLY_NEXT_INPUT,
181 IP6_FULL_REASSEMBLY_NEXT_DROP,
182 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
183 IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
184 IP6_FULL_REASSEMBLY_N_NEXT,
185 } ip6_full_reass_next_t;
191 ICMP_ERROR_RT_EXCEEDED,
192 ICMP_ERROR_FL_TOO_BIG,
193 ICMP_ERROR_FL_NOT_MULT_8,
196 } ip6_full_reass_trace_operation_e;
206 } ip6_full_reass_range_trace_t;
210 ip6_full_reass_trace_operation_e action;
212 ip6_full_reass_range_trace_t trace_range;
219 bool is_after_handoff;
220 ip6_header_t ip6_header;
221 ip6_frag_hdr_t ip6_frag_header;
222 } ip6_full_reass_trace_t;
225 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
226 ip6_full_reass_range_trace_t * trace)
228 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
229 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
230 trace->range_first = vnb->ip.reass.range_first;
231 trace->range_last = vnb->ip.reass.range_last;
232 trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
233 trace->data_len = ip6_full_reass_buffer_get_data_len (b);
234 trace->range_bi = bi;
238 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
240 ip6_full_reass_range_trace_t *trace =
241 va_arg (*args, ip6_full_reass_range_trace_t *);
243 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
244 trace->range_last, trace->data_offset, trace->data_len,
250 format_ip6_full_reass_trace (u8 * s, va_list * args)
252 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
253 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
254 ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
256 if (~0 != t->reass_id)
258 if (t->is_after_handoff)
261 format (s, "%U\n", format_ip6_header, &t->ip6_header,
262 sizeof (t->ip6_header));
264 format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
265 sizeof (t->ip6_frag_header));
269 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
270 t->reass_id, t->op_id);
271 indent = format_get_indent (s);
272 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
273 t->trace_range.first_bi, t->total_data_len,
274 t->fragment_first, t->fragment_last);
279 s = format (s, "\n%Unew %U", format_white_space, indent,
280 format_ip6_full_reass_range_trace, &t->trace_range);
283 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
284 format_ip6_full_reass_range_trace, &t->trace_range);
286 case ICMP_ERROR_FL_TOO_BIG:
287 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
288 format_white_space, indent,
289 format_ip6_full_reass_range_trace, &t->trace_range);
291 case ICMP_ERROR_FL_NOT_MULT_8:
292 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
293 format_white_space, indent,
294 format_ip6_full_reass_range_trace, &t->trace_range);
296 case ICMP_ERROR_RT_EXCEEDED:
297 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
298 format_white_space, indent);
301 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
305 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
313 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
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_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_t * reass, u32 * icmp_bi)
466 if (~0 == reass->first_bi)
470 if (~0 == reass->next_index) // custom apps don't want icmp
472 vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
473 if (0 == vnet_buffer (b)->ip.reass.fragment_first)
475 *icmp_bi = reass->first_bi;
476 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
478 ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
479 ICMP_ERROR_RT_EXCEEDED, ~0);
481 // fragment with offset zero received - send icmp message back
482 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
484 // separate first buffer from chain and steer it towards icmp node
485 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
486 reass->first_bi = b->next_buffer;
490 reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
492 icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
493 ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
497 ip6_full_reass_drop_all (vm, node, reass);
500 always_inline ip6_full_reass_t *
501 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
502 ip6_full_reass_main_t * rm,
503 ip6_full_reass_per_thread_t * rt,
504 ip6_full_reass_kv_t * kv, u32 * icmp_bi,
507 ip6_full_reass_t *reass;
513 now = vlib_time_now (vm);
515 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
517 if (vm->thread_index != kv->v.memory_owner_thread_index)
524 pool_elt_at_index (rm->per_thread_data
525 [kv->v.memory_owner_thread_index].pool,
528 if (now > reass->last_heard + rm->timeout)
530 ip6_full_reass_on_timeout (vm, node, reass, icmp_bi);
531 ip6_full_reass_free (rm, rt, reass);
538 reass->last_heard = now;
542 if (rt->reass_n >= rm->max_reass_n)
549 pool_get (rt->pool, reass);
550 clib_memset (reass, 0, sizeof (*reass));
551 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
553 reass->first_bi = ~0;
554 reass->last_packet_octet = ~0;
556 reass->next_index = ~0;
557 reass->error_next_index = ~0;
561 reass->key.as_u64[0] = kv->kv.key[0];
562 reass->key.as_u64[1] = kv->kv.key[1];
563 reass->key.as_u64[2] = kv->kv.key[2];
564 reass->key.as_u64[3] = kv->kv.key[3];
565 reass->key.as_u64[4] = kv->kv.key[4];
566 reass->key.as_u64[5] = kv->kv.key[5];
567 kv->v.reass_index = (reass - rt->pool);
568 kv->v.memory_owner_thread_index = vm->thread_index;
569 reass->last_heard = now;
571 int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
574 ip6_full_reass_free (rm, rt, reass);
576 // if other worker created a context already work with the other copy
584 always_inline ip6_full_reass_rc_t
585 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
586 ip6_full_reass_main_t * rm,
587 ip6_full_reass_per_thread_t * rt,
588 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
589 u32 * error0, bool is_custom_app)
591 *bi0 = reass->first_bi;
592 *error0 = IP6_ERROR_NONE;
593 ip6_frag_hdr_t *frag_hdr;
594 vlib_buffer_t *last_b = NULL;
595 u32 sub_chain_bi = reass->first_bi;
596 u32 total_length = 0;
599 u32 *vec_drop_compress = NULL;
600 ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
603 u32 tmp_bi = sub_chain_bi;
604 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
605 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
606 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
607 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
609 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
610 goto free_buffers_and_return;
613 u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
614 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
615 sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
617 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
618 if (tmp_bi == reass->first_bi)
620 /* first buffer - keep ip6 header */
621 if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
623 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
624 goto free_buffers_and_return;
627 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
628 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
630 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
632 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
633 goto free_buffers_and_return;
637 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
643 if (trim_front > tmp->current_length)
645 /* drop whole buffer */
646 vec_add1 (vec_drop_compress, tmp_bi);
647 trim_front -= tmp->current_length;
648 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
650 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
651 goto free_buffers_and_return;
653 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
654 tmp_bi = tmp->next_buffer;
655 tmp = vlib_get_buffer (vm, tmp_bi);
660 vlib_buffer_advance (tmp, trim_front);
668 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
669 last_b->next_buffer = tmp_bi;
672 if (keep_data <= tmp->current_length)
674 tmp->current_length = keep_data;
679 keep_data -= tmp->current_length;
680 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
682 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
683 goto free_buffers_and_return;
686 total_length += tmp->current_length;
690 vec_add1 (vec_drop_compress, tmp_bi);
691 if (reass->first_bi == tmp_bi)
693 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
694 goto free_buffers_and_return;
698 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
700 tmp_bi = tmp->next_buffer;
701 tmp = vlib_get_buffer (vm, tmp->next_buffer);
709 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
712 while (~0 != sub_chain_bi);
716 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
717 goto free_buffers_and_return;
719 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
720 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
721 if (total_length < first_b->current_length)
723 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
724 goto free_buffers_and_return;
726 total_length -= first_b->current_length;
727 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
728 first_b->total_length_not_including_first_buffer = total_length;
729 // drop fragment header
730 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
731 ip6_header_t *ip = vlib_buffer_get_current (first_b);
732 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
733 ip6_ext_hdr_chain_t hdr_chain;
734 ip6_ext_header_t *prev_hdr = 0;
735 int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
738 (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
740 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
741 goto free_buffers_and_return;
743 frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
746 prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
747 prev_hdr->next_hdr = frag_hdr->next_hdr;
751 ip->protocol = frag_hdr->next_hdr;
753 if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
755 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
756 goto free_buffers_and_return;
758 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
759 first_b->current_length - ip6_frag_hdr_offset -
760 sizeof (ip6_frag_hdr_t));
761 first_b->current_length -= sizeof (*frag_hdr);
763 clib_host_to_net_u16 (total_length + first_b->current_length -
765 if (!vlib_buffer_chain_linearize (vm, first_b))
767 rv = IP6_FULL_REASS_RC_NO_BUF;
768 goto free_buffers_and_return;
770 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
771 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
773 ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
776 // following code does a hexdump of packet fragments to stdout ...
779 u32 bi = reass->first_bi;
783 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
784 s = format (s, "%u: %U\n", bi, format_hexdump,
785 vlib_buffer_get_current (b), b->current_length);
786 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
795 printf ("%.*s\n", vec_len (s), s);
804 *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
808 *next0 = reass->next_index;
810 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
811 ip6_full_reass_free (rm, rt, reass);
813 free_buffers_and_return:
814 vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
815 vec_free (vec_drop_compress);
820 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
821 ip6_full_reass_t * reass,
822 u32 prev_range_bi, u32 new_next_bi)
825 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
826 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
827 if (~0 != prev_range_bi)
829 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
830 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
831 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
832 prev_vnb->ip.reass.next_range_bi = new_next_bi;
836 if (~0 != reass->first_bi)
838 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
840 reass->first_bi = new_next_bi;
842 reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
845 always_inline ip6_full_reass_rc_t
846 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
847 ip6_full_reass_main_t * rm,
848 ip6_full_reass_per_thread_t * rt,
849 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
850 u32 * error0, ip6_frag_hdr_t * frag_hdr,
851 bool is_custom_app, u32 * handoff_thread_idx)
854 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
855 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
858 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
859 reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
862 fvnb->ip.reass.ip6_frag_hdr_offset =
863 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
864 ip6_header_t *fip = vlib_buffer_get_current (fb);
865 if (fb->current_length < sizeof (*fip) ||
866 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
867 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
869 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
872 u32 fragment_first = fvnb->ip.reass.fragment_first =
873 ip6_frag_hdr_offset_bytes (frag_hdr);
874 u32 fragment_length =
875 vlib_buffer_length_in_chain (vm, fb) -
876 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
877 u32 fragment_last = fvnb->ip.reass.fragment_last =
878 fragment_first + fragment_length - 1;
879 int more_fragments = ip6_frag_hdr_more (frag_hdr);
880 u32 candidate_range_bi = reass->first_bi;
881 u32 prev_range_bi = ~0;
882 fvnb->ip.reass.range_first = fragment_first;
883 fvnb->ip.reass.range_last = fragment_last;
884 fvnb->ip.reass.next_range_bi = ~0;
887 reass->last_packet_octet = fragment_last;
889 if (~0 == reass->first_bi)
891 // starting a new reassembly
892 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
893 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
895 reass->fragments_n = 1;
896 goto check_if_done_maybe;
898 reass->min_fragment_length =
899 clib_min (clib_net_to_host_u16 (fip->payload_length),
900 fvnb->ip.reass.estimated_mtu);
901 while (~0 != candidate_range_bi)
903 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
904 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
905 if (fragment_first > candidate_vnb->ip.reass.range_last)
907 // this fragments starts after candidate range
908 prev_range_bi = candidate_range_bi;
909 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
910 if (candidate_vnb->ip.reass.range_last < fragment_last &&
911 ~0 == candidate_range_bi)
913 // special case - this fragment falls beyond all known ranges
914 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
921 if (fragment_last < candidate_vnb->ip.reass.range_first)
923 // this fragment ends before candidate range without any overlap
924 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
928 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
929 fragment_last == candidate_vnb->ip.reass.range_last)
931 // duplicate fragment - ignore
935 // overlapping fragment - not allowed by RFC 8200
936 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
938 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
941 ip6_full_reass_drop_all (vm, node, reass);
942 ip6_full_reass_free (rm, rt, reass);
943 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
944 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
945 return IP6_FULL_REASS_RC_OK;
949 ++reass->fragments_n;
953 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
955 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
959 if (~0 != reass->last_packet_octet &&
960 reass->data_len == reass->last_packet_octet + 1)
962 *handoff_thread_idx = reass->sendout_thread_index;
964 reass->memory_owner_thread_index != reass->sendout_thread_index;
965 ip6_full_reass_rc_t rc =
966 ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
968 if (IP6_FULL_REASS_RC_OK == rc && handoff)
970 return IP6_FULL_REASS_RC_HANDOFF;
979 if (reass->fragments_n > rm->max_reass_len)
981 return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
986 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
987 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
990 return IP6_FULL_REASS_RC_OK;
994 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
996 ip6_ext_hdr_chain_t *hc)
998 int nh = hc->eh[hc->length - 1].protocol;
999 /* Checking to see if it's a terminating header */
1000 if (ip6_ext_hdr (nh))
1002 icmp6_error_set_vnet_buffer (
1003 b, ICMP6_parameter_problem,
1004 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1005 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1012 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1014 ip6_frag_hdr_t * frag_hdr)
1016 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1017 ip6_header_t *ip = vlib_buffer_get_current (b);
1018 int more_fragments = ip6_frag_hdr_more (frag_hdr);
1019 u32 fragment_length =
1020 vlib_buffer_length_in_chain (vm, b) -
1021 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1022 if (more_fragments && 0 != fragment_length % 8)
1024 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1025 ICMP6_parameter_problem_erroneous_header_field,
1026 (u8 *) & ip->payload_length - (u8 *) ip);
1033 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1035 ip6_frag_hdr_t * frag_hdr)
1037 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1038 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1039 u32 fragment_length =
1040 vlib_buffer_length_in_chain (vm, b) -
1041 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1042 if (fragment_first + fragment_length > 65535)
1044 ip6_header_t *ip0 = vlib_buffer_get_current (b);
1045 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1046 ICMP6_parameter_problem_erroneous_header_field,
1047 (u8 *) & frag_hdr->fragment_offset_and_more
1055 ip6_full_reassembly_inline (vlib_main_t * vm,
1056 vlib_node_runtime_t * node,
1057 vlib_frame_t * frame, bool is_feature,
1060 u32 *from = vlib_frame_vector_args (frame);
1061 u32 n_left_from, n_left_to_next, *to_next, next_index;
1062 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1063 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1064 clib_spinlock_lock (&rt->lock);
1066 n_left_from = frame->n_vectors;
1067 next_index = node->cached_next_index;
1068 while (n_left_from > 0)
1070 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1072 while (n_left_from > 0 && n_left_to_next > 0)
1076 u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1077 u32 error0 = IP6_ERROR_NONE;
1081 b0 = vlib_get_buffer (vm, bi0);
1083 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1084 ip6_frag_hdr_t *frag_hdr;
1085 ip6_ext_hdr_chain_t hdr_chain;
1086 int res = ip6_ext_header_walk (
1087 b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1089 hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1091 // this is a mangled packet - no fragmentation
1092 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1096 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1097 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1098 hdr_chain.eh[res].offset;
1100 if (0 == ip6_frag_hdr_offset (frag_hdr))
1102 // first fragment - verify upper-layer is present
1103 if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1106 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1110 if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1111 !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
1113 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1116 ip6_full_reass_kv_t kv;
1119 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1120 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1121 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1122 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1124 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1125 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1126 (u64) frag_hdr->identification;
1127 kv.k.as_u64[5] = ip0->protocol;
1129 ip6_full_reass_t *reass =
1130 ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1135 const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1136 if (0 == fragment_first)
1138 reass->sendout_thread_index = vm->thread_index;
1141 if (PREDICT_FALSE (do_handoff))
1143 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1144 vnet_buffer (b0)->ip.reass.owner_thread_index =
1145 kv.v.memory_owner_thread_index;
1149 u32 handoff_thread_idx;
1151 switch (ip6_full_reass_update
1152 (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1153 frag_hdr, is_custom_app, &handoff_thread_idx))
1155 case IP6_FULL_REASS_RC_OK:
1156 /* nothing to do here */
1158 case IP6_FULL_REASS_RC_HANDOFF:
1159 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1160 b0 = vlib_get_buffer (vm, bi0);
1161 vnet_buffer (b0)->ip.reass.owner_thread_index =
1164 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1165 counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1167 case IP6_FULL_REASS_RC_NO_BUF:
1168 counter = IP6_ERROR_REASS_NO_BUF;
1170 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1171 counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1176 vlib_node_increment_counter (vm, node->node_index, counter,
1178 ip6_full_reass_drop_all (vm, node, reass);
1179 ip6_full_reass_free (rm, rt, reass);
1187 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1191 vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1192 next0 = fvnb->ip.reass.error_next_index;
1194 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1202 n_left_to_next -= 1;
1204 /* bi0 might have been updated by reass_finalize, reload */
1205 b0 = vlib_get_buffer (vm, bi0);
1206 if (IP6_ERROR_NONE != error0)
1208 b0->error = node->errors[error0];
1211 if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1213 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1215 ip6_full_reass_add_trace (
1216 vm, node, NULL, bi0, frag_hdr, HANDOFF,
1217 vnet_buffer (b0)->ip.reass.owner_thread_index);
1220 else if (is_feature && IP6_ERROR_NONE == error0)
1222 vnet_feature_next (&next0, b0);
1224 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1225 n_left_to_next, bi0, next0);
1230 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1231 to_next[0] = icmp_bi;
1233 n_left_to_next -= 1;
1234 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1235 n_left_to_next, icmp_bi,
1243 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1246 clib_spinlock_unlock (&rt->lock);
1247 return frame->n_vectors;
1250 static char *ip6_full_reassembly_error_strings[] = {
1251 #define _(sym, string) string,
1256 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1257 vlib_node_runtime_t * node,
1258 vlib_frame_t * frame)
1260 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1261 false /* is_custom_app */ );
1264 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1265 .name = "ip6-full-reassembly",
1266 .vector_size = sizeof (u32),
1267 .format_trace = format_ip6_full_reass_trace,
1268 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1269 .error_strings = ip6_full_reassembly_error_strings,
1270 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1273 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1274 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1275 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1276 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1280 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1281 vlib_node_runtime_t * node,
1282 vlib_frame_t * frame)
1284 return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1285 false /* is_custom_app */ );
1288 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1289 .name = "ip6-full-reassembly-feature",
1290 .vector_size = sizeof (u32),
1291 .format_trace = format_ip6_full_reass_trace,
1292 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1293 .error_strings = ip6_full_reassembly_error_strings,
1294 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1297 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1298 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1299 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1300 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1304 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1305 .arc_name = "ip6-unicast",
1306 .node_name = "ip6-full-reassembly-feature",
1307 .runs_before = VNET_FEATURES ("ip6-lookup",
1308 "ipsec6-input-feature"),
1312 #ifndef CLIB_MARCH_VARIANT
1314 ip6_full_reass_get_nbuckets ()
1316 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1320 nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1322 for (i = 0; i < 31; i++)
1323 if ((1 << i) >= nbuckets)
1329 #endif /* CLIB_MARCH_VARIANT */
1333 IP6_EVENT_CONFIG_CHANGED = 1,
1334 } ip6_full_reass_event_t;
1336 #ifndef CLIB_MARCH_VARIANT
1340 clib_bihash_48_8_t *new_hash;
1341 } ip6_rehash_cb_ctx;
1344 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1346 ip6_rehash_cb_ctx *ctx = _ctx;
1347 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1351 return (BIHASH_WALK_CONTINUE);
1355 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1356 u32 max_reassembly_length,
1357 u32 expire_walk_interval_ms)
1359 ip6_full_reass_main.timeout_ms = timeout_ms;
1360 ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1361 ip6_full_reass_main.max_reass_n = max_reassemblies;
1362 ip6_full_reass_main.max_reass_len = max_reassembly_length;
1363 ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1367 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1368 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1370 u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1371 ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1372 max_reassembly_length, expire_walk_interval_ms);
1373 vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1374 ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1375 IP6_EVENT_CONFIG_CHANGED, 0);
1376 u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1377 if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1379 clib_bihash_48_8_t new_hash;
1380 clib_memset (&new_hash, 0, sizeof (new_hash));
1381 ip6_rehash_cb_ctx ctx;
1383 ctx.new_hash = &new_hash;
1384 clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1385 new_nbuckets * 1024);
1386 clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1387 ip6_rehash_cb, &ctx);
1390 clib_bihash_free_48_8 (&new_hash);
1395 clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1396 clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1397 sizeof (ip6_full_reass_main.hash));
1398 clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1405 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1406 u32 * max_reassembly_length,
1407 u32 * expire_walk_interval_ms)
1409 *timeout_ms = ip6_full_reass_main.timeout_ms;
1410 *max_reassemblies = ip6_full_reass_main.max_reass_n;
1411 *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1412 *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1416 static clib_error_t *
1417 ip6_full_reass_init_function (vlib_main_t * vm)
1419 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1420 clib_error_t *error = 0;
1426 vec_validate (rm->per_thread_data, vlib_num_workers ());
1427 ip6_full_reass_per_thread_t *rt;
1428 vec_foreach (rt, rm->per_thread_data)
1430 clib_spinlock_init (&rt->lock);
1431 pool_alloc (rt->pool, rm->max_reass_n);
1434 node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1436 rm->ip6_full_reass_expire_node_idx = node->index;
1438 ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1439 IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1440 IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1441 IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1443 nbuckets = ip6_full_reass_get_nbuckets ();
1444 clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1447 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1449 rm->ip6_drop_idx = node->index;
1450 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1452 rm->ip6_icmp_error_idx = node->index;
1454 if ((error = vlib_call_init_function (vm, ip_main_init)))
1456 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1457 ip6_full_reass_node.index);
1459 rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1460 rm->fq_feature_index =
1461 vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1463 rm->feature_use_refcount_per_intf = NULL;
1467 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1468 #endif /* CLIB_MARCH_VARIANT */
1471 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1472 CLIB_UNUSED (vlib_frame_t *f))
1474 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1475 uword event_type, *event_data = 0;
1479 vlib_process_wait_for_event_or_clock (vm,
1480 (f64) rm->expire_walk_interval_ms
1481 / (f64) MSEC_PER_SEC);
1482 event_type = vlib_process_get_events (vm, &event_data);
1487 /* no events => timeout */
1489 case IP6_EVENT_CONFIG_CHANGED:
1490 /* nothing to do here */
1493 clib_warning ("BUG: event type 0x%wx", event_type);
1496 f64 now = vlib_time_now (vm);
1498 ip6_full_reass_t *reass;
1499 int *pool_indexes_to_free = NULL;
1501 uword thread_index = 0;
1503 const uword nthreads = vlib_num_workers () + 1;
1504 u32 *vec_icmp_bi = NULL;
1505 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1507 ip6_full_reass_per_thread_t *rt =
1508 &rm->per_thread_data[thread_index];
1509 clib_spinlock_lock (&rt->lock);
1511 vec_reset_length (pool_indexes_to_free);
1512 pool_foreach_index (index, rt->pool) {
1513 reass = pool_elt_at_index (rt->pool, index);
1514 if (now > reass->last_heard + rm->timeout)
1516 vec_add1 (pool_indexes_to_free, index);
1520 vec_foreach (i, pool_indexes_to_free)
1522 ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1524 ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1526 vec_add1 (vec_icmp_bi, icmp_bi);
1528 ip6_full_reass_free (rm, rt, reass);
1531 clib_spinlock_unlock (&rt->lock);
1534 while (vec_len (vec_icmp_bi) > 0)
1537 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1538 u32 *to_next = vlib_frame_vector_args (f);
1539 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1540 int trace_frame = 0;
1541 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1543 u32 bi = vec_pop (vec_icmp_bi);
1544 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1545 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1547 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1551 n_left_to_next -= 1;
1553 f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1554 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1557 vec_free (pool_indexes_to_free);
1558 vec_free (vec_icmp_bi);
1561 _vec_len (event_data) = 0;
1568 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1569 .function = ip6_full_reass_walk_expired,
1570 .format_trace = format_ip6_full_reass_trace,
1571 .type = VLIB_NODE_TYPE_PROCESS,
1572 .name = "ip6-full-reassembly-expire-walk",
1574 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1575 .error_strings = ip6_full_reassembly_error_strings,
1580 format_ip6_full_reass_key (u8 * s, va_list * args)
1582 ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1583 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1584 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1585 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1590 format_ip6_full_reass (u8 * s, va_list * args)
1592 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1593 ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1595 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1596 "last_packet_octet: %u, trace_op_counter: %u\n",
1597 reass->id, format_ip6_full_reass_key, &reass->key,
1598 reass->first_bi, reass->data_len, reass->last_packet_octet,
1599 reass->trace_op_counter);
1600 u32 bi = reass->first_bi;
1604 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1605 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1606 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1607 "fragment[%u, %u]\n",
1608 counter, vnb->ip.reass.range_first,
1609 vnb->ip.reass.range_last, bi,
1610 ip6_full_reass_buffer_get_data_offset (b),
1611 ip6_full_reass_buffer_get_data_len (b),
1612 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1613 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1615 bi = b->next_buffer;
1625 static clib_error_t *
1626 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1627 CLIB_UNUSED (vlib_cli_command_t * lmd))
1629 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1631 vlib_cli_output (vm, "---------------------");
1632 vlib_cli_output (vm, "IP6 reassembly status");
1633 vlib_cli_output (vm, "---------------------");
1634 bool details = false;
1635 if (unformat (input, "details"))
1640 u32 sum_reass_n = 0;
1641 u64 sum_buffers_n = 0;
1642 ip6_full_reass_t *reass;
1644 const uword nthreads = vlib_num_workers () + 1;
1645 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1647 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1648 clib_spinlock_lock (&rt->lock);
1651 pool_foreach (reass, rt->pool) {
1652 vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1655 sum_reass_n += rt->reass_n;
1656 clib_spinlock_unlock (&rt->lock);
1658 vlib_cli_output (vm, "---------------------");
1659 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1660 (long unsigned) sum_reass_n);
1661 vlib_cli_output (vm,
1662 "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1663 (long unsigned) rm->max_reass_n);
1664 vlib_cli_output (vm,
1665 "Maximum configured amount of fragments "
1666 "per full IP6 reassembly: %lu\n",
1667 (long unsigned) rm->max_reass_len);
1668 vlib_cli_output (vm,
1669 "Maximum configured full IP6 reassembly timeout: %lums\n",
1670 (long unsigned) rm->timeout_ms);
1671 vlib_cli_output (vm,
1672 "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1673 (long unsigned) rm->expire_walk_interval_ms);
1674 vlib_cli_output (vm, "Buffers in use: %lu\n",
1675 (long unsigned) sum_buffers_n);
1679 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1680 .path = "show ip6-full-reassembly",
1681 .short_help = "show ip6-full-reassembly [details]",
1682 .function = show_ip6_full_reass,
1685 #ifndef CLIB_MARCH_VARIANT
1687 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1689 return vnet_feature_enable_disable ("ip6-unicast",
1690 "ip6-full-reassembly-feature",
1691 sw_if_index, enable_disable, 0, 0);
1693 #endif /* CLIB_MARCH_VARIANT */
1695 #define foreach_ip6_full_reassembly_handoff_error \
1696 _(CONGESTION_DROP, "congestion drop")
1701 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1702 foreach_ip6_full_reassembly_handoff_error
1704 IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1705 } ip6_full_reassembly_handoff_error_t;
1707 static char *ip6_full_reassembly_handoff_error_strings[] = {
1708 #define _(sym,string) string,
1709 foreach_ip6_full_reassembly_handoff_error
1715 u32 next_worker_index;
1716 } ip6_full_reassembly_handoff_trace_t;
1719 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1721 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1722 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1723 ip6_full_reassembly_handoff_trace_t *t =
1724 va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1727 format (s, "ip6-full-reassembly-handoff: next-worker %d",
1728 t->next_worker_index);
1734 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1735 vlib_node_runtime_t * node,
1736 vlib_frame_t * frame, bool is_feature)
1738 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1740 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1741 u32 n_enq, n_left_from, *from;
1742 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1745 from = vlib_frame_vector_args (frame);
1746 n_left_from = frame->n_vectors;
1747 vlib_get_buffers (vm, from, bufs, n_left_from);
1750 ti = thread_indices;
1752 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1754 while (n_left_from > 0)
1756 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1759 ((node->flags & VLIB_NODE_FLAG_TRACE)
1760 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1762 ip6_full_reassembly_handoff_trace_t *t =
1763 vlib_add_trace (vm, node, b[0], sizeof (*t));
1764 t->next_worker_index = ti[0];
1771 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1772 thread_indices, frame->n_vectors, 1);
1774 if (n_enq < frame->n_vectors)
1775 vlib_node_increment_counter (vm, node->node_index,
1776 IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1777 frame->n_vectors - n_enq);
1778 return frame->n_vectors;
1781 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1782 vlib_node_runtime_t * node,
1783 vlib_frame_t * frame)
1785 return ip6_full_reassembly_handoff_inline (vm, node, frame,
1786 false /* is_feature */ );
1789 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1790 .name = "ip6-full-reassembly-handoff",
1791 .vector_size = sizeof (u32),
1792 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1793 .error_strings = ip6_full_reassembly_handoff_error_strings,
1794 .format_trace = format_ip6_full_reassembly_handoff_trace,
1804 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1805 vlib_node_runtime_t * node, vlib_frame_t * frame)
1807 return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1811 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1812 .name = "ip6-full-reass-feature-hoff",
1813 .vector_size = sizeof (u32),
1814 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1815 .error_strings = ip6_full_reassembly_handoff_error_strings,
1816 .format_trace = format_ip6_full_reassembly_handoff_trace,
1825 #ifndef CLIB_MARCH_VARIANT
1827 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1829 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1830 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1833 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1835 ++rm->feature_use_refcount_per_intf[sw_if_index];
1836 return vnet_feature_enable_disable ("ip6-unicast",
1837 "ip6-full-reassembly-feature",
1838 sw_if_index, 1, 0, 0);
1840 ++rm->feature_use_refcount_per_intf[sw_if_index];
1844 --rm->feature_use_refcount_per_intf[sw_if_index];
1845 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1846 return vnet_feature_enable_disable ("ip6-unicast",
1847 "ip6-full-reassembly-feature",
1848 sw_if_index, 0, 0, 0);
1855 * fd.io coding-style-patch-verification: ON
1858 * eval: (c-set-style "gnu")