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 */
167 u32 fq_feature_index;
169 // reference count for enabling/disabling feature - per interface
170 u32 *feature_use_refcount_per_intf;
171 } ip6_full_reass_main_t;
173 extern ip6_full_reass_main_t ip6_full_reass_main;
175 #ifndef CLIB_MARCH_VARIANT
176 ip6_full_reass_main_t ip6_full_reass_main;
177 #endif /* CLIB_MARCH_VARIANT */
181 IP6_FULL_REASSEMBLY_NEXT_INPUT,
182 IP6_FULL_REASSEMBLY_NEXT_DROP,
183 IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
184 IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
185 IP6_FULL_REASSEMBLY_N_NEXT,
186 } ip6_full_reass_next_t;
192 ICMP_ERROR_RT_EXCEEDED,
193 ICMP_ERROR_FL_TOO_BIG,
194 ICMP_ERROR_FL_NOT_MULT_8,
197 } ip6_full_reass_trace_operation_e;
207 } ip6_full_reass_range_trace_t;
211 ip6_full_reass_trace_operation_e action;
213 ip6_full_reass_range_trace_t trace_range;
220 bool is_after_handoff;
221 ip6_header_t ip6_header;
222 ip6_frag_hdr_t ip6_frag_header;
223 } ip6_full_reass_trace_t;
226 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
227 ip6_full_reass_range_trace_t * trace)
229 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
230 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
231 trace->range_first = vnb->ip.reass.range_first;
232 trace->range_last = vnb->ip.reass.range_last;
233 trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
234 trace->data_len = ip6_full_reass_buffer_get_data_len (b);
235 trace->range_bi = bi;
239 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
241 ip6_full_reass_range_trace_t *trace =
242 va_arg (*args, ip6_full_reass_range_trace_t *);
244 format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
245 trace->range_last, trace->data_offset, trace->data_len,
251 format_ip6_full_reass_trace (u8 * s, va_list * args)
253 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
254 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
255 ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
257 if (~0 != t->reass_id)
259 if (t->is_after_handoff)
262 format (s, "%U\n", format_ip6_header, &t->ip6_header,
263 sizeof (t->ip6_header));
265 format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
266 sizeof (t->ip6_frag_header));
270 format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
271 t->reass_id, t->op_id);
272 indent = format_get_indent (s);
273 s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
274 t->trace_range.first_bi, t->total_data_len,
275 t->fragment_first, t->fragment_last);
280 s = format (s, "\n%Unew %U", format_white_space, indent,
281 format_ip6_full_reass_range_trace, &t->trace_range);
284 s = format (s, "\n%Uoverlap %U", format_white_space, indent,
285 format_ip6_full_reass_range_trace, &t->trace_range);
287 case ICMP_ERROR_FL_TOO_BIG:
288 s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
289 format_white_space, indent,
290 format_ip6_full_reass_range_trace, &t->trace_range);
292 case ICMP_ERROR_FL_NOT_MULT_8:
293 s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
294 format_white_space, indent,
295 format_ip6_full_reass_range_trace, &t->trace_range);
297 case ICMP_ERROR_RT_EXCEEDED:
298 s = format (s, "\n%Uicmp-error - reassembly time exceeded",
299 format_white_space, indent);
302 s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
306 format (s, "handoff from thread #%u to thread #%u", t->thread_id,
314 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
315 ip6_full_reass_t * reass, u32 bi,
316 ip6_frag_hdr_t * ip6_frag_header,
317 ip6_full_reass_trace_operation_e action,
320 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
321 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
322 bool is_after_handoff = false;
323 if (pool_is_free_index
324 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
326 // this buffer's trace is gone
327 b->flags &= ~VLIB_BUFFER_IS_TRACED;
330 if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
332 is_after_handoff = true;
334 ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
335 t->is_after_handoff = is_after_handoff;
336 if (t->is_after_handoff)
338 clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
339 clib_min (sizeof (t->ip6_header), b->current_length));
342 clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
343 sizeof (t->ip6_frag_header));
347 clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
352 t->reass_id = reass->id;
353 t->op_id = reass->trace_op_counter;
354 t->trace_range.first_bi = reass->first_bi;
355 t->total_data_len = reass->data_len;
356 ++reass->trace_op_counter;
363 t->thread_id = vm->thread_index;
364 t->thread_id_to = thread_id_to;
365 ip6_full_reass_trace_details (vm, bi, &t->trace_range);
366 t->fragment_first = vnb->ip.reass.fragment_first;
367 t->fragment_last = vnb->ip.reass.fragment_last;
370 s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
371 printf ("%.*s\n", vec_len (s), s);
373 vec_reset_length (s);
378 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
379 ip6_full_reass_t * reass)
381 pool_put (rt->pool, reass);
386 ip6_full_reass_free (ip6_full_reass_main_t * rm,
387 ip6_full_reass_per_thread_t * rt,
388 ip6_full_reass_t * reass)
390 clib_bihash_kv_48_8_t kv;
391 kv.key[0] = reass->key.as_u64[0];
392 kv.key[1] = reass->key.as_u64[1];
393 kv.key[2] = reass->key.as_u64[2];
394 kv.key[3] = reass->key.as_u64[3];
395 kv.key[4] = reass->key.as_u64[4];
396 kv.key[5] = reass->key.as_u64[5];
397 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
398 ip6_full_reass_free_ctx (rt, reass);
402 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
403 ip6_full_reass_t *reass)
405 u32 range_bi = reass->first_bi;
406 vlib_buffer_t *range_b;
407 vnet_buffer_opaque_t *range_vnb;
409 while (~0 != range_bi)
411 range_b = vlib_get_buffer (vm, range_bi);
412 range_vnb = vnet_buffer (range_b);
416 vec_add1 (to_free, bi);
417 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
418 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
421 b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
428 range_bi = range_vnb->ip.reass.next_range_bi;
430 /* send to next_error_index */
431 if (~0 != reass->error_next_index)
433 u32 n_left_to_next, *to_next, next_index;
435 next_index = reass->error_next_index;
438 while (vec_len (to_free) > 0)
440 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
442 while (vec_len (to_free) > 0 && n_left_to_next > 0)
444 bi = vec_pop (to_free);
453 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
458 vlib_buffer_free (vm, to_free, vec_len (to_free));
464 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
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, reass, reass->first_bi, NULL,
480 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, 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,
506 u8 *do_handoff, int skip_bihash)
508 ip6_full_reass_t *reass;
514 now = vlib_time_now (vm);
516 if (!skip_bihash && !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, 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 kv->v.reass_index = (reass - rt->pool);
563 kv->v.memory_owner_thread_index = vm->thread_index;
564 reass->last_heard = now;
568 reass->key.as_u64[0] = kv->kv.key[0];
569 reass->key.as_u64[1] = kv->kv.key[1];
570 reass->key.as_u64[2] = kv->kv.key[2];
571 reass->key.as_u64[3] = kv->kv.key[3];
572 reass->key.as_u64[4] = kv->kv.key[4];
573 reass->key.as_u64[5] = kv->kv.key[5];
575 int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
578 ip6_full_reass_free (rm, rt, reass);
580 // if other worker created a context already work with the other copy
587 reass->key.as_u64[0] = ~0;
588 reass->key.as_u64[1] = ~0;
589 reass->key.as_u64[2] = ~0;
590 reass->key.as_u64[3] = ~0;
591 reass->key.as_u64[4] = ~0;
592 reass->key.as_u64[5] = ~0;
598 always_inline ip6_full_reass_rc_t
599 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
600 ip6_full_reass_main_t * rm,
601 ip6_full_reass_per_thread_t * rt,
602 ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
603 u32 * error0, bool is_custom_app)
605 *bi0 = reass->first_bi;
606 *error0 = IP6_ERROR_NONE;
607 ip6_frag_hdr_t *frag_hdr;
608 vlib_buffer_t *last_b = NULL;
609 u32 sub_chain_bi = reass->first_bi;
610 u32 total_length = 0;
613 u32 *vec_drop_compress = NULL;
614 ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
617 u32 tmp_bi = sub_chain_bi;
618 vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
619 vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
620 if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
621 !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
623 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
624 goto free_buffers_and_return;
627 u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
628 u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
629 sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
631 vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
632 if (tmp_bi == reass->first_bi)
634 /* first buffer - keep ip6 header */
635 if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
637 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
638 goto free_buffers_and_return;
641 trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
642 (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
644 if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
646 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
647 goto free_buffers_and_return;
651 vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
657 if (trim_front > tmp->current_length)
659 /* drop whole buffer */
660 vec_add1 (vec_drop_compress, tmp_bi);
661 trim_front -= tmp->current_length;
662 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
664 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
665 goto free_buffers_and_return;
667 tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
668 tmp_bi = tmp->next_buffer;
669 tmp = vlib_get_buffer (vm, tmp_bi);
674 vlib_buffer_advance (tmp, trim_front);
682 last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
683 last_b->next_buffer = tmp_bi;
686 if (keep_data <= tmp->current_length)
688 tmp->current_length = keep_data;
693 keep_data -= tmp->current_length;
694 if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
696 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
697 goto free_buffers_and_return;
700 total_length += tmp->current_length;
704 vec_add1 (vec_drop_compress, tmp_bi);
705 if (reass->first_bi == tmp_bi)
707 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
708 goto free_buffers_and_return;
712 if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
714 tmp_bi = tmp->next_buffer;
715 tmp = vlib_get_buffer (vm, tmp->next_buffer);
723 vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
726 while (~0 != sub_chain_bi);
730 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
731 goto free_buffers_and_return;
733 last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
734 vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
735 if (total_length < first_b->current_length)
737 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
738 goto free_buffers_and_return;
740 total_length -= first_b->current_length;
741 first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
742 first_b->total_length_not_including_first_buffer = total_length;
743 // drop fragment header
744 vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
745 ip6_header_t *ip = vlib_buffer_get_current (first_b);
746 u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
747 ip6_ext_hdr_chain_t hdr_chain;
748 ip6_ext_header_t *prev_hdr = 0;
749 int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
752 (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
754 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
755 goto free_buffers_and_return;
757 frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
760 prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
761 prev_hdr->next_hdr = frag_hdr->next_hdr;
765 ip->protocol = frag_hdr->next_hdr;
767 if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
769 rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
770 goto free_buffers_and_return;
772 memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
773 first_b->current_length - ip6_frag_hdr_offset -
774 sizeof (ip6_frag_hdr_t));
775 first_b->current_length -= sizeof (*frag_hdr);
777 clib_host_to_net_u16 (total_length + first_b->current_length -
779 if (!vlib_buffer_chain_linearize (vm, first_b))
781 rv = IP6_FULL_REASS_RC_NO_BUF;
782 goto free_buffers_and_return;
784 first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
785 if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
787 ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
790 // following code does a hexdump of packet fragments to stdout ...
793 u32 bi = reass->first_bi;
797 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
798 s = format (s, "%u: %U\n", bi, format_hexdump,
799 vlib_buffer_get_current (b), b->current_length);
800 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
809 printf ("%.*s\n", vec_len (s), s);
818 *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
822 *next0 = reass->next_index;
824 vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
825 ip6_full_reass_free (rm, rt, reass);
827 free_buffers_and_return:
828 vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
829 vec_free (vec_drop_compress);
834 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
835 ip6_full_reass_t * reass,
836 u32 prev_range_bi, u32 new_next_bi)
839 vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
840 vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
841 if (~0 != prev_range_bi)
843 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
844 vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
845 new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
846 prev_vnb->ip.reass.next_range_bi = new_next_bi;
850 if (~0 != reass->first_bi)
852 new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
854 reass->first_bi = new_next_bi;
856 reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
859 always_inline ip6_full_reass_rc_t
860 ip6_full_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
861 ip6_full_reass_main_t *rm,
862 ip6_full_reass_per_thread_t *rt,
863 ip6_full_reass_t *reass, u32 *bi0, u32 *next0,
864 u32 *error0, ip6_frag_hdr_t *frag_hdr,
865 bool is_custom_app, u32 *handoff_thread_idx,
869 vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
870 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
873 reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
874 reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
877 fvnb->ip.reass.ip6_frag_hdr_offset =
878 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
879 ip6_header_t *fip = vlib_buffer_get_current (fb);
880 if (fb->current_length < sizeof (*fip) ||
881 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
882 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
884 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
887 u32 fragment_first = fvnb->ip.reass.fragment_first =
888 ip6_frag_hdr_offset_bytes (frag_hdr);
889 u32 fragment_length =
890 vlib_buffer_length_in_chain (vm, fb) -
891 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
892 if (0 == fragment_length)
894 return IP6_FULL_REASS_RC_INVALID_FRAG_LEN;
896 u32 fragment_last = fvnb->ip.reass.fragment_last =
897 fragment_first + fragment_length - 1;
898 int more_fragments = ip6_frag_hdr_more (frag_hdr);
899 u32 candidate_range_bi = reass->first_bi;
900 u32 prev_range_bi = ~0;
901 fvnb->ip.reass.range_first = fragment_first;
902 fvnb->ip.reass.range_last = fragment_last;
903 fvnb->ip.reass.next_range_bi = ~0;
906 reass->last_packet_octet = fragment_last;
908 if (~0 == reass->first_bi)
910 // starting a new reassembly
911 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
912 reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
914 reass->fragments_n = 1;
915 goto check_if_done_maybe;
917 reass->min_fragment_length =
918 clib_min (clib_net_to_host_u16 (fip->payload_length),
919 fvnb->ip.reass.estimated_mtu);
920 while (~0 != candidate_range_bi)
922 vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
923 vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
924 if (fragment_first > candidate_vnb->ip.reass.range_last)
926 // this fragments starts after candidate range
927 prev_range_bi = candidate_range_bi;
928 candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
929 if (candidate_vnb->ip.reass.range_last < fragment_last &&
930 ~0 == candidate_range_bi)
932 // special case - this fragment falls beyond all known ranges
933 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
940 if (fragment_last < candidate_vnb->ip.reass.range_first)
942 // this fragment ends before candidate range without any overlap
943 ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
947 else if (fragment_first == candidate_vnb->ip.reass.range_first &&
948 fragment_last == candidate_vnb->ip.reass.range_last)
950 // duplicate fragment - ignore
954 // overlapping fragment - not allowed by RFC 8200
955 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
957 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
960 ip6_full_reass_drop_all (vm, node, reass);
961 ip6_full_reass_free (rm, rt, reass);
962 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
963 *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
964 return IP6_FULL_REASS_RC_OK;
968 ++reass->fragments_n;
972 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
974 ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
978 else if (skip_bihash)
980 // if this reassembly is not in bihash, then the packet must have been
982 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
984 if (~0 != reass->last_packet_octet &&
985 reass->data_len == reass->last_packet_octet + 1)
987 *handoff_thread_idx = reass->sendout_thread_index;
989 reass->memory_owner_thread_index != reass->sendout_thread_index;
990 ip6_full_reass_rc_t rc =
991 ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
993 if (IP6_FULL_REASS_RC_OK == rc && handoff)
995 return IP6_FULL_REASS_RC_HANDOFF;
1003 // if this reassembly is not in bihash, it should've been an atomic
1004 // fragment and thus finalized
1005 return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1010 if (reass->fragments_n > rm->max_reass_len)
1012 return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
1017 *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1018 *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
1021 return IP6_FULL_REASS_RC_OK;
1025 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
1027 ip6_ext_hdr_chain_t *hc)
1029 int nh = hc->eh[hc->length - 1].protocol;
1030 /* Checking to see if it's a terminating header */
1031 if (ip6_ext_hdr (nh))
1033 icmp6_error_set_vnet_buffer (
1034 b, ICMP6_parameter_problem,
1035 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1036 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1043 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1045 ip6_frag_hdr_t * frag_hdr)
1047 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1048 ip6_header_t *ip = vlib_buffer_get_current (b);
1049 int more_fragments = ip6_frag_hdr_more (frag_hdr);
1050 u32 fragment_length =
1051 vlib_buffer_length_in_chain (vm, b) -
1052 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1053 if (more_fragments && 0 != fragment_length % 8)
1055 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1056 ICMP6_parameter_problem_erroneous_header_field,
1057 (u8 *) & ip->payload_length - (u8 *) ip);
1064 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1066 ip6_frag_hdr_t * frag_hdr)
1068 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1069 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1070 u32 fragment_length =
1071 vlib_buffer_length_in_chain (vm, b) -
1072 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1073 if (fragment_first + fragment_length > 65535)
1075 ip6_header_t *ip0 = vlib_buffer_get_current (b);
1076 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1077 ICMP6_parameter_problem_erroneous_header_field,
1078 (u8 *) & frag_hdr->fragment_offset_and_more
1086 ip6_full_reassembly_inline (vlib_main_t * vm,
1087 vlib_node_runtime_t * node,
1088 vlib_frame_t * frame, bool is_feature,
1091 u32 *from = vlib_frame_vector_args (frame);
1092 u32 n_left_from, n_left_to_next, *to_next, next_index;
1093 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1094 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1095 clib_spinlock_lock (&rt->lock);
1097 n_left_from = frame->n_vectors;
1098 next_index = node->cached_next_index;
1099 while (n_left_from > 0)
1101 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1103 while (n_left_from > 0 && n_left_to_next > 0)
1107 u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1108 u32 error0 = IP6_ERROR_NONE;
1112 b0 = vlib_get_buffer (vm, bi0);
1114 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1115 ip6_frag_hdr_t *frag_hdr;
1116 ip6_ext_hdr_chain_t hdr_chain;
1117 int res = ip6_ext_header_walk (
1118 b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1120 hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1122 // this is a mangled packet - no fragmentation
1123 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1127 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1128 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1129 hdr_chain.eh[res].offset;
1131 if (0 == ip6_frag_hdr_offset (frag_hdr))
1133 // first fragment - verify upper-layer is present
1134 if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1137 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1141 if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1142 !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
1144 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1148 int skip_bihash = 0;
1149 ip6_full_reass_kv_t kv;
1152 if (0 == ip6_frag_hdr_offset (frag_hdr) &&
1153 !ip6_frag_hdr_more (frag_hdr))
1155 // this is atomic fragment and needs to be processed separately
1160 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1161 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1162 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1163 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1165 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1166 vnet_buffer (b0)->sw_if_index[VLIB_RX]))
1168 (u64) frag_hdr->identification;
1169 kv.k.as_u64[5] = ip0->protocol;
1172 ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
1173 vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash);
1177 const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1178 if (0 == fragment_first)
1180 reass->sendout_thread_index = vm->thread_index;
1183 if (PREDICT_FALSE (do_handoff))
1185 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1186 vnet_buffer (b0)->ip.reass.owner_thread_index =
1187 kv.v.memory_owner_thread_index;
1191 u32 handoff_thread_idx;
1193 switch (ip6_full_reass_update (
1194 vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
1195 is_custom_app, &handoff_thread_idx, skip_bihash))
1197 case IP6_FULL_REASS_RC_OK:
1198 /* nothing to do here */
1200 case IP6_FULL_REASS_RC_HANDOFF:
1201 next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1202 b0 = vlib_get_buffer (vm, bi0);
1203 vnet_buffer (b0)->ip.reass.owner_thread_index =
1206 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1207 counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1209 case IP6_FULL_REASS_RC_NO_BUF:
1210 counter = IP6_ERROR_REASS_NO_BUF;
1212 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1213 counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1215 case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
1216 counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
1221 vlib_node_increment_counter (vm, node->node_index, counter,
1223 ip6_full_reass_drop_all (vm, node, reass);
1224 ip6_full_reass_free (rm, rt, reass);
1232 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1236 vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1237 next0 = fvnb->ip.reass.error_next_index;
1239 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1247 n_left_to_next -= 1;
1249 /* bi0 might have been updated by reass_finalize, reload */
1250 b0 = vlib_get_buffer (vm, bi0);
1251 if (IP6_ERROR_NONE != error0)
1253 b0->error = node->errors[error0];
1256 if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1258 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1260 ip6_full_reass_add_trace (
1261 vm, node, NULL, bi0, frag_hdr, HANDOFF,
1262 vnet_buffer (b0)->ip.reass.owner_thread_index);
1265 else if (is_feature && IP6_ERROR_NONE == error0)
1267 vnet_feature_next (&next0, b0);
1269 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1270 n_left_to_next, bi0, next0);
1275 next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1276 to_next[0] = icmp_bi;
1278 n_left_to_next -= 1;
1279 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1280 n_left_to_next, icmp_bi,
1288 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1291 clib_spinlock_unlock (&rt->lock);
1292 return frame->n_vectors;
1295 static char *ip6_full_reassembly_error_strings[] = {
1296 #define _(sym, string) string,
1301 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1302 vlib_node_runtime_t * node,
1303 vlib_frame_t * frame)
1305 return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1306 false /* is_custom_app */ );
1309 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1310 .name = "ip6-full-reassembly",
1311 .vector_size = sizeof (u32),
1312 .format_trace = format_ip6_full_reass_trace,
1313 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1314 .error_strings = ip6_full_reassembly_error_strings,
1315 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1318 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1319 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1320 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1321 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1325 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1326 vlib_node_runtime_t * node,
1327 vlib_frame_t * frame)
1329 return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1330 false /* is_custom_app */ );
1333 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1334 .name = "ip6-full-reassembly-feature",
1335 .vector_size = sizeof (u32),
1336 .format_trace = format_ip6_full_reass_trace,
1337 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1338 .error_strings = ip6_full_reassembly_error_strings,
1339 .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1342 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1343 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1344 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1345 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1349 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1350 .arc_name = "ip6-unicast",
1351 .node_name = "ip6-full-reassembly-feature",
1352 .runs_before = VNET_FEATURES ("ip6-lookup",
1353 "ipsec6-input-feature"),
1357 #ifndef CLIB_MARCH_VARIANT
1359 ip6_full_reass_get_nbuckets ()
1361 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1365 nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1367 for (i = 0; i < 31; i++)
1368 if ((1 << i) >= nbuckets)
1374 #endif /* CLIB_MARCH_VARIANT */
1378 IP6_EVENT_CONFIG_CHANGED = 1,
1379 } ip6_full_reass_event_t;
1381 #ifndef CLIB_MARCH_VARIANT
1385 clib_bihash_48_8_t *new_hash;
1386 } ip6_rehash_cb_ctx;
1389 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1391 ip6_rehash_cb_ctx *ctx = _ctx;
1392 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1396 return (BIHASH_WALK_CONTINUE);
1400 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1401 u32 max_reassembly_length,
1402 u32 expire_walk_interval_ms)
1404 ip6_full_reass_main.timeout_ms = timeout_ms;
1405 ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1406 ip6_full_reass_main.max_reass_n = max_reassemblies;
1407 ip6_full_reass_main.max_reass_len = max_reassembly_length;
1408 ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1412 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1413 u32 max_reassembly_length, u32 expire_walk_interval_ms)
1415 u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1416 ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1417 max_reassembly_length, expire_walk_interval_ms);
1418 vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1419 ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1420 IP6_EVENT_CONFIG_CHANGED, 0);
1421 u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1422 if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1424 clib_bihash_48_8_t new_hash;
1425 clib_memset (&new_hash, 0, sizeof (new_hash));
1426 ip6_rehash_cb_ctx ctx;
1428 ctx.new_hash = &new_hash;
1429 clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1430 new_nbuckets * 1024);
1431 clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1432 ip6_rehash_cb, &ctx);
1435 clib_bihash_free_48_8 (&new_hash);
1440 clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1441 clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1442 sizeof (ip6_full_reass_main.hash));
1443 clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1450 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1451 u32 * max_reassembly_length,
1452 u32 * expire_walk_interval_ms)
1454 *timeout_ms = ip6_full_reass_main.timeout_ms;
1455 *max_reassemblies = ip6_full_reass_main.max_reass_n;
1456 *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1457 *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1461 static clib_error_t *
1462 ip6_full_reass_init_function (vlib_main_t * vm)
1464 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1465 clib_error_t *error = 0;
1471 vec_validate (rm->per_thread_data, vlib_num_workers ());
1472 ip6_full_reass_per_thread_t *rt;
1473 vec_foreach (rt, rm->per_thread_data)
1475 clib_spinlock_init (&rt->lock);
1476 pool_alloc (rt->pool, rm->max_reass_n);
1479 node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1481 rm->ip6_full_reass_expire_node_idx = node->index;
1483 ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1484 IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1485 IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1486 IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1488 nbuckets = ip6_full_reass_get_nbuckets ();
1489 clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1492 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1494 rm->ip6_drop_idx = node->index;
1495 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1497 rm->ip6_icmp_error_idx = node->index;
1499 if ((error = vlib_call_init_function (vm, ip_main_init)))
1501 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1502 ip6_full_reass_node.index);
1504 rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1505 rm->fq_feature_index =
1506 vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1508 rm->feature_use_refcount_per_intf = NULL;
1512 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1513 #endif /* CLIB_MARCH_VARIANT */
1516 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1517 CLIB_UNUSED (vlib_frame_t *f))
1519 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1520 uword event_type, *event_data = 0;
1524 vlib_process_wait_for_event_or_clock (vm,
1525 (f64) rm->expire_walk_interval_ms
1526 / (f64) MSEC_PER_SEC);
1527 event_type = vlib_process_get_events (vm, &event_data);
1532 /* no events => timeout */
1534 case IP6_EVENT_CONFIG_CHANGED:
1535 /* nothing to do here */
1538 clib_warning ("BUG: event type 0x%wx", event_type);
1541 f64 now = vlib_time_now (vm);
1543 ip6_full_reass_t *reass;
1544 int *pool_indexes_to_free = NULL;
1546 uword thread_index = 0;
1548 const uword nthreads = vlib_num_workers () + 1;
1549 u32 *vec_icmp_bi = NULL;
1550 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1552 ip6_full_reass_per_thread_t *rt =
1553 &rm->per_thread_data[thread_index];
1554 clib_spinlock_lock (&rt->lock);
1556 vec_reset_length (pool_indexes_to_free);
1557 pool_foreach_index (index, rt->pool) {
1558 reass = pool_elt_at_index (rt->pool, index);
1559 if (now > reass->last_heard + rm->timeout)
1561 vec_add1 (pool_indexes_to_free, index);
1565 vec_foreach (i, pool_indexes_to_free)
1567 ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1569 ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1571 vec_add1 (vec_icmp_bi, icmp_bi);
1573 ip6_full_reass_free (rm, rt, reass);
1576 clib_spinlock_unlock (&rt->lock);
1579 while (vec_len (vec_icmp_bi) > 0)
1582 vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1583 u32 *to_next = vlib_frame_vector_args (f);
1584 u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1585 int trace_frame = 0;
1586 while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1588 u32 bi = vec_pop (vec_icmp_bi);
1589 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1590 if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1592 b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1596 n_left_to_next -= 1;
1598 f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1599 vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1602 vec_free (pool_indexes_to_free);
1603 vec_free (vec_icmp_bi);
1606 _vec_len (event_data) = 0;
1613 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1614 .function = ip6_full_reass_walk_expired,
1615 .format_trace = format_ip6_full_reass_trace,
1616 .type = VLIB_NODE_TYPE_PROCESS,
1617 .name = "ip6-full-reassembly-expire-walk",
1619 .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1620 .error_strings = ip6_full_reassembly_error_strings,
1625 format_ip6_full_reass_key (u8 * s, va_list * args)
1627 ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1628 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1629 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1630 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1635 format_ip6_full_reass (u8 * s, va_list * args)
1637 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1638 ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1640 s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
1641 "last_packet_octet: %u, trace_op_counter: %u\n",
1642 reass->id, format_ip6_full_reass_key, &reass->key,
1643 reass->first_bi, reass->data_len, reass->last_packet_octet,
1644 reass->trace_op_counter);
1645 u32 bi = reass->first_bi;
1649 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1650 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1651 s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1652 "fragment[%u, %u]\n",
1653 counter, vnb->ip.reass.range_first,
1654 vnb->ip.reass.range_last, bi,
1655 ip6_full_reass_buffer_get_data_offset (b),
1656 ip6_full_reass_buffer_get_data_len (b),
1657 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1658 if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1660 bi = b->next_buffer;
1670 static clib_error_t *
1671 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1672 CLIB_UNUSED (vlib_cli_command_t * lmd))
1674 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1676 vlib_cli_output (vm, "---------------------");
1677 vlib_cli_output (vm, "IP6 reassembly status");
1678 vlib_cli_output (vm, "---------------------");
1679 bool details = false;
1680 if (unformat (input, "details"))
1685 u32 sum_reass_n = 0;
1686 u64 sum_buffers_n = 0;
1687 ip6_full_reass_t *reass;
1689 const uword nthreads = vlib_num_workers () + 1;
1690 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1692 ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1693 clib_spinlock_lock (&rt->lock);
1696 pool_foreach (reass, rt->pool) {
1697 vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1700 sum_reass_n += rt->reass_n;
1701 clib_spinlock_unlock (&rt->lock);
1703 vlib_cli_output (vm, "---------------------");
1704 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1705 (long unsigned) sum_reass_n);
1706 vlib_cli_output (vm,
1707 "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1708 (long unsigned) rm->max_reass_n);
1709 vlib_cli_output (vm,
1710 "Maximum configured amount of fragments "
1711 "per full IP6 reassembly: %lu\n",
1712 (long unsigned) rm->max_reass_len);
1713 vlib_cli_output (vm,
1714 "Maximum configured full IP6 reassembly timeout: %lums\n",
1715 (long unsigned) rm->timeout_ms);
1716 vlib_cli_output (vm,
1717 "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1718 (long unsigned) rm->expire_walk_interval_ms);
1719 vlib_cli_output (vm, "Buffers in use: %lu\n",
1720 (long unsigned) sum_buffers_n);
1724 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1725 .path = "show ip6-full-reassembly",
1726 .short_help = "show ip6-full-reassembly [details]",
1727 .function = show_ip6_full_reass,
1730 #ifndef CLIB_MARCH_VARIANT
1732 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1734 return vnet_feature_enable_disable ("ip6-unicast",
1735 "ip6-full-reassembly-feature",
1736 sw_if_index, enable_disable, 0, 0);
1738 #endif /* CLIB_MARCH_VARIANT */
1740 #define foreach_ip6_full_reassembly_handoff_error \
1741 _(CONGESTION_DROP, "congestion drop")
1746 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1747 foreach_ip6_full_reassembly_handoff_error
1749 IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1750 } ip6_full_reassembly_handoff_error_t;
1752 static char *ip6_full_reassembly_handoff_error_strings[] = {
1753 #define _(sym,string) string,
1754 foreach_ip6_full_reassembly_handoff_error
1760 u32 next_worker_index;
1761 } ip6_full_reassembly_handoff_trace_t;
1764 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1766 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1767 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1768 ip6_full_reassembly_handoff_trace_t *t =
1769 va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1772 format (s, "ip6-full-reassembly-handoff: next-worker %d",
1773 t->next_worker_index);
1779 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1780 vlib_node_runtime_t * node,
1781 vlib_frame_t * frame, bool is_feature)
1783 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1785 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1786 u32 n_enq, n_left_from, *from;
1787 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1790 from = vlib_frame_vector_args (frame);
1791 n_left_from = frame->n_vectors;
1792 vlib_get_buffers (vm, from, bufs, n_left_from);
1795 ti = thread_indices;
1797 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1799 while (n_left_from > 0)
1801 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1804 ((node->flags & VLIB_NODE_FLAG_TRACE)
1805 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1807 ip6_full_reassembly_handoff_trace_t *t =
1808 vlib_add_trace (vm, node, b[0], sizeof (*t));
1809 t->next_worker_index = ti[0];
1816 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1817 thread_indices, frame->n_vectors, 1);
1819 if (n_enq < frame->n_vectors)
1820 vlib_node_increment_counter (vm, node->node_index,
1821 IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1822 frame->n_vectors - n_enq);
1823 return frame->n_vectors;
1826 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1827 vlib_node_runtime_t * node,
1828 vlib_frame_t * frame)
1830 return ip6_full_reassembly_handoff_inline (vm, node, frame,
1831 false /* is_feature */ );
1834 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1835 .name = "ip6-full-reassembly-handoff",
1836 .vector_size = sizeof (u32),
1837 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1838 .error_strings = ip6_full_reassembly_handoff_error_strings,
1839 .format_trace = format_ip6_full_reassembly_handoff_trace,
1849 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1850 vlib_node_runtime_t * node, vlib_frame_t * frame)
1852 return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1856 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1857 .name = "ip6-full-reass-feature-hoff",
1858 .vector_size = sizeof (u32),
1859 .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1860 .error_strings = ip6_full_reassembly_handoff_error_strings,
1861 .format_trace = format_ip6_full_reassembly_handoff_trace,
1870 #ifndef CLIB_MARCH_VARIANT
1872 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1874 ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1875 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1878 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1880 ++rm->feature_use_refcount_per_intf[sw_if_index];
1881 return vnet_feature_enable_disable ("ip6-unicast",
1882 "ip6-full-reassembly-feature",
1883 sw_if_index, 1, 0, 0);
1885 ++rm->feature_use_refcount_per_intf[sw_if_index];
1889 --rm->feature_use_refcount_per_intf[sw_if_index];
1890 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1891 return vnet_feature_enable_disable ("ip6-unicast",
1892 "ip6-full-reassembly-feature",
1893 sw_if_index, 0, 0, 0);
1900 * fd.io coding-style-patch-verification: ON
1903 * eval: (c-set-style "gnu")