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 Shallow Virtual Reassembly.
20 * This file contains the source code for IPv6 Shallow Virtual reassembly.
23 #include <vppinfra/vec.h>
24 #include <vnet/vnet.h>
25 #include <vnet/ip/ip.h>
26 #include <vnet/ip/ip6_to_ip4.h>
27 #include <vppinfra/bihash_48_8.h>
28 #include <vnet/ip/reass/ip6_sv_reass.h>
30 #define MSEC_PER_SEC 1000
31 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
32 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
33 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
34 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
35 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
40 IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
41 IP6_SV_REASS_RC_INTERNAL_ERROR,
42 IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
79 clib_bihash_kv_48_8_t kv;
85 ip6_sv_reass_key_t key;
86 // time when last packet was received
88 // internal id of this reassembly
90 // trace operation counter
92 // buffer indexes of buffers in this reassembly in chronological order -
93 // including overlaps and duplicate fragments
95 // set to true when this reassembly is completed
99 u8 icmp_type_or_tcp_flags;
113 ip6_sv_reass_t *pool;
116 clib_spinlock_t lock;
120 } ip6_sv_reass_per_thread_t;
127 u32 expire_walk_interval_ms;
128 // maximum number of fragments in one reassembly
130 // maximum number of reassemblies
134 clib_bihash_48_8_t hash;
137 ip6_sv_reass_per_thread_t *per_thread_data;
140 vlib_main_t *vlib_main;
141 vnet_main_t *vnet_main;
143 // node index of ip6-drop node
145 u32 ip6_icmp_error_idx;
146 u32 ip6_sv_reass_expire_node_idx;
148 /** Worker handoff */
150 u32 fq_feature_index;
152 // reference count for enabling/disabling feature - per interface
153 u32 *feature_use_refcount_per_intf;
154 } ip6_sv_reass_main_t;
156 extern ip6_sv_reass_main_t ip6_sv_reass_main;
158 #ifndef CLIB_MARCH_VARIANT
159 ip6_sv_reass_main_t ip6_sv_reass_main;
160 #endif /* CLIB_MARCH_VARIANT */
164 IP6_SV_REASSEMBLY_NEXT_INPUT,
165 IP6_SV_REASSEMBLY_NEXT_DROP,
166 IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
167 IP6_SV_REASSEMBLY_NEXT_HANDOFF,
168 IP6_SV_REASSEMBLY_N_NEXT,
169 } ip6_sv_reass_next_t;
173 REASS_FRAGMENT_CACHE,
175 REASS_FRAGMENT_FORWARD,
177 } ip6_sv_reass_trace_operation_e;
181 ip6_sv_reass_trace_operation_e action;
187 } ip6_sv_reass_trace_t;
190 format_ip6_sv_reass_trace (u8 * s, va_list * args)
192 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
193 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
194 ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
195 if (REASS_PASSTHROUGH != t->action)
197 s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
201 case REASS_FRAGMENT_CACHE:
202 s = format (s, "[cached]");
206 format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
207 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
208 clib_net_to_host_u16 (t->l4_dst_port));
210 case REASS_FRAGMENT_FORWARD:
212 format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
213 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
214 clib_net_to_host_u16 (t->l4_dst_port));
216 case REASS_PASSTHROUGH:
217 s = format (s, "[not-fragmented]");
224 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
225 ip6_sv_reass_t * reass, u32 bi,
226 ip6_sv_reass_trace_operation_e action,
227 u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
229 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
230 if (pool_is_free_index
231 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
233 // this buffer's trace is gone
234 b->flags &= ~VLIB_BUFFER_IS_TRACED;
237 ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
240 t->reass_id = reass->id;
241 t->op_id = reass->trace_op_counter;
242 ++reass->trace_op_counter;
245 t->ip_proto = ip_proto;
246 t->l4_src_port = l4_src_port;
247 t->l4_dst_port = l4_dst_port;
250 s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
251 printf ("%.*s\n", vec_len (s), s);
253 vec_reset_length (s);
258 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
259 ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
261 clib_bihash_kv_48_8_t kv;
262 kv.key[0] = reass->key.as_u64[0];
263 kv.key[1] = reass->key.as_u64[1];
264 kv.key[2] = reass->key.as_u64[2];
265 kv.key[3] = reass->key.as_u64[3];
266 kv.key[4] = reass->key.as_u64[4];
267 kv.key[5] = reass->key.as_u64[5];
268 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
269 vlib_buffer_free (vm, reass->cached_buffers,
270 vec_len (reass->cached_buffers));
271 vec_free (reass->cached_buffers);
272 reass->cached_buffers = NULL;
273 if (~0 != reass->lru_prev)
275 ip6_sv_reass_t *lru_prev =
276 pool_elt_at_index (rt->pool, reass->lru_prev);
277 lru_prev->lru_next = reass->lru_next;
279 if (~0 != reass->lru_next)
281 ip6_sv_reass_t *lru_next =
282 pool_elt_at_index (rt->pool, reass->lru_next);
283 lru_next->lru_prev = reass->lru_prev;
285 if (rt->lru_first == reass - rt->pool)
287 rt->lru_first = reass->lru_next;
289 if (rt->lru_last == reass - rt->pool)
291 rt->lru_last = reass->lru_prev;
293 pool_put (rt->pool, reass);
298 ip6_sv_reass_init (ip6_sv_reass_t * reass)
300 reass->cached_buffers = NULL;
301 reass->is_complete = false;
304 always_inline ip6_sv_reass_t *
305 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
306 ip6_sv_reass_per_thread_t *rt,
307 ip6_sv_reass_kv_t *kv, u8 *do_handoff)
309 ip6_sv_reass_t *reass = NULL;
310 f64 now = vlib_time_now (vm);
312 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
314 if (vm->thread_index != kv->v.thread_index)
319 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
321 if (now > reass->last_heard + rm->timeout)
323 ip6_sv_reass_free (vm, rm, rt, reass);
330 reass->last_heard = now;
334 if (rt->reass_n >= rm->max_reass_n)
336 reass = pool_elt_at_index (rt->pool, rt->lru_first);
337 ip6_sv_reass_free (vm, rm, rt, reass);
340 pool_get (rt->pool, reass);
341 clib_memset (reass, 0, sizeof (*reass));
342 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
344 ip6_sv_reass_init (reass);
347 reass->lru_prev = reass->lru_next = ~0;
349 if (~0 != rt->lru_last)
351 ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
352 reass->lru_prev = rt->lru_last;
353 lru_last->lru_next = rt->lru_last = reass - rt->pool;
356 if (~0 == rt->lru_first)
358 rt->lru_first = rt->lru_last = reass - rt->pool;
361 reass->key.as_u64[0] = kv->kv.key[0];
362 reass->key.as_u64[1] = kv->kv.key[1];
363 reass->key.as_u64[2] = kv->kv.key[2];
364 reass->key.as_u64[3] = kv->kv.key[3];
365 reass->key.as_u64[4] = kv->kv.key[4];
366 reass->key.as_u64[5] = kv->kv.key[5];
367 kv->v.reass_index = (reass - rt->pool);
368 kv->v.thread_index = vm->thread_index;
369 reass->last_heard = now;
371 if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
373 ip6_sv_reass_free (vm, rm, rt, reass);
380 always_inline ip6_sv_reass_rc_t
381 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
382 ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
383 ip6_frag_hdr_t *frag_hdr)
385 vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
386 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
387 fvnb->ip.reass.ip6_frag_hdr_offset =
388 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
389 ip6_header_t *fip = vlib_buffer_get_current (fb);
390 if (fb->current_length < sizeof (*fip) ||
391 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
392 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
394 return IP6_SV_REASS_RC_INTERNAL_ERROR;
397 u32 fragment_first = fvnb->ip.reass.fragment_first =
398 ip6_frag_hdr_offset_bytes (frag_hdr);
399 u32 fragment_length =
400 vlib_buffer_length_in_chain (vm, fb) -
401 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
402 u32 fragment_last = fvnb->ip.reass.fragment_last =
403 fragment_first + fragment_length - 1;
404 fvnb->ip.reass.range_first = fragment_first;
405 fvnb->ip.reass.range_last = fragment_last;
406 fvnb->ip.reass.next_range_bi = ~0;
407 if (0 == fragment_first)
410 (vm, fb, fip, fb->current_length, &reass->ip_proto,
411 &reass->l4_src_port, &reass->l4_dst_port,
412 &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
413 &reass->tcp_seq_number))
414 return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
416 reass->is_complete = true;
417 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
418 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
420 ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
421 reass->ip_proto, reass->l4_src_port,
425 vec_add1 (reass->cached_buffers, bi0);
426 if (!reass->is_complete)
428 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
430 ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
431 reass->ip_proto, reass->l4_src_port,
434 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
436 return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
439 return IP6_SV_REASS_RC_OK;
443 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
445 ip6_frag_hdr_t * frag_hdr)
447 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
448 while (ip6_ext_hdr (tmp->next_hdr))
450 tmp = ip6_ext_next_header (tmp);
452 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
454 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
455 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
457 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
465 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
467 ip6_frag_hdr_t * frag_hdr)
469 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
470 ip6_header_t *ip = vlib_buffer_get_current (b);
471 int more_fragments = ip6_frag_hdr_more (frag_hdr);
472 u32 fragment_length =
473 vlib_buffer_length_in_chain (vm, b) -
474 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
475 if (more_fragments && 0 != fragment_length % 8)
477 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
478 ICMP6_parameter_problem_erroneous_header_field,
479 (u8 *) & ip->payload_length - (u8 *) ip);
486 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
488 ip6_frag_hdr_t * frag_hdr)
490 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
491 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
492 u32 fragment_length =
493 vlib_buffer_length_in_chain (vm, b) -
494 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
495 if (fragment_first + fragment_length > 65535)
497 ip6_header_t *ip0 = vlib_buffer_get_current (b);
498 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
499 ICMP6_parameter_problem_erroneous_header_field,
500 (u8 *) & frag_hdr->fragment_offset_and_more
508 ip6_sv_reassembly_inline (vlib_main_t * vm,
509 vlib_node_runtime_t * node,
510 vlib_frame_t * frame, bool is_feature)
512 u32 *from = vlib_frame_vector_args (frame);
513 u32 n_left_from, n_left_to_next, *to_next, next_index;
514 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
515 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
516 clib_spinlock_lock (&rt->lock);
518 n_left_from = frame->n_vectors;
519 next_index = node->cached_next_index;
521 while (n_left_from > 0)
523 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
525 while (n_left_from > 0 && n_left_to_next > 0)
529 u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
530 u32 error0 = IP6_ERROR_NONE;
533 b0 = vlib_get_buffer (vm, bi0);
535 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
536 ip6_frag_hdr_t *frag_hdr = NULL;
537 ip6_ext_header_t *prev_hdr;
538 if (ip6_ext_hdr (ip0->protocol))
541 ip6_ext_header_find (vm, b0, ip0,
542 IP_PROTOCOL_IPV6_FRAGMENTATION,
547 // this is a regular packet - no fragmentation
549 (vm, b0, ip0, b0->current_length,
550 &(vnet_buffer (b0)->ip.reass.ip_proto),
551 &(vnet_buffer (b0)->ip.reass.l4_src_port),
552 &(vnet_buffer (b0)->ip.reass.l4_dst_port),
553 &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
554 &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
555 &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
557 error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
558 b0->error = node->errors[error0];
559 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
562 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
563 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
564 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
566 ip6_sv_reass_add_trace (
567 vm, node, NULL, bi0, REASS_PASSTHROUGH,
568 vnet_buffer (b0)->ip.reass.ip_proto,
569 vnet_buffer (b0)->ip.reass.l4_src_port,
570 vnet_buffer (b0)->ip.reass.l4_dst_port);
574 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
575 (u8 *) frag_hdr - (u8 *) ip0;
576 if (0 == ip6_frag_hdr_offset (frag_hdr))
578 // first fragment - verify upper-layer is present
579 if (!ip6_sv_reass_verify_upper_layer_present
580 (node, b0, frag_hdr))
582 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
586 if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
587 !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
589 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
593 ip6_sv_reass_kv_t kv;
596 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
597 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
598 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
599 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
601 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
602 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
603 (u64) frag_hdr->identification;
604 kv.k.as_u64[5] = ip0->protocol;
606 ip6_sv_reass_t *reass =
607 ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
609 if (PREDICT_FALSE (do_handoff))
611 next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
612 vnet_buffer (b0)->ip.reass.owner_thread_index =
619 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
620 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
621 b0->error = node->errors[error0];
625 if (reass->is_complete)
627 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
628 ! !ip6_frag_hdr_offset (frag_hdr);
629 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
630 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
631 reass->icmp_type_or_tcp_flags;
632 vnet_buffer (b0)->ip.reass.tcp_ack_number =
633 reass->tcp_ack_number;
634 vnet_buffer (b0)->ip.reass.tcp_seq_number =
635 reass->tcp_seq_number;
636 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
637 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
638 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
639 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
641 ip6_sv_reass_add_trace (
642 vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
643 reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
649 switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
651 case IP6_SV_REASS_RC_OK:
652 /* nothing to do here */
654 case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
655 counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
657 case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
658 counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
660 case IP6_SV_REASS_RC_INTERNAL_ERROR:
661 counter = IP6_ERROR_REASS_INTERNAL_ERROR;
666 vlib_node_increment_counter (vm, node->node_index, counter, 1);
667 ip6_sv_reass_free (vm, rm, rt, reass);
671 if (reass->is_complete)
674 vec_foreach_index (idx, reass->cached_buffers)
676 u32 bi0 = vec_elt (reass->cached_buffers, idx);
677 if (0 == n_left_to_next)
679 vlib_put_next_frame (vm, node, next_index,
681 vlib_get_next_frame (vm, node, next_index, to_next,
687 b0 = vlib_get_buffer (vm, bi0);
690 vnet_feature_next (&next0, b0);
693 vlib_buffer_get_current (b0) +
694 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
695 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
696 ! !ip6_frag_hdr_offset (frag_hdr);
697 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
698 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
699 reass->icmp_type_or_tcp_flags;
700 vnet_buffer (b0)->ip.reass.tcp_ack_number =
701 reass->tcp_ack_number;
702 vnet_buffer (b0)->ip.reass.tcp_seq_number =
703 reass->tcp_seq_number;
704 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
705 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
706 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
708 ip6_sv_reass_add_trace (
709 vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
710 reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
712 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
713 to_next, n_left_to_next, bi0,
716 _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
724 if (is_feature && IP6_ERROR_NONE == error0)
726 b0 = vlib_get_buffer (vm, bi0);
727 vnet_feature_next (&next0, b0);
729 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
730 n_left_to_next, bi0, next0);
737 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
740 clib_spinlock_unlock (&rt->lock);
741 return frame->n_vectors;
744 static char *ip6_sv_reassembly_error_strings[] = {
745 #define _(sym, string) string,
750 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
751 vlib_node_runtime_t * node,
752 vlib_frame_t * frame)
754 return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
758 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
759 .name = "ip6-sv-reassembly",
760 .vector_size = sizeof (u32),
761 .format_trace = format_ip6_sv_reass_trace,
762 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
763 .error_strings = ip6_sv_reassembly_error_strings,
764 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
767 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
768 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
769 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
770 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
775 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
776 vlib_node_runtime_t * node,
777 vlib_frame_t * frame)
779 return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
783 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
784 .name = "ip6-sv-reassembly-feature",
785 .vector_size = sizeof (u32),
786 .format_trace = format_ip6_sv_reass_trace,
787 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
788 .error_strings = ip6_sv_reassembly_error_strings,
789 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
792 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
793 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
794 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
795 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
801 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
802 .arc_name = "ip6-unicast",
803 .node_name = "ip6-sv-reassembly-feature",
804 .runs_before = VNET_FEATURES ("ip6-lookup"),
809 #ifndef CLIB_MARCH_VARIANT
811 ip6_sv_reass_get_nbuckets ()
813 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
817 nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
819 for (i = 0; i < 31; i++)
820 if ((1 << i) >= nbuckets)
826 #endif /* CLIB_MARCH_VARIANT */
830 IP6_EVENT_CONFIG_CHANGED = 1,
831 } ip6_sv_reass_event_t;
833 #ifndef CLIB_MARCH_VARIANT
837 clib_bihash_48_8_t *new_hash;
841 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
843 ip6_rehash_cb_ctx *ctx = _ctx;
844 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
848 return (BIHASH_WALK_CONTINUE);
852 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
853 u32 max_reassembly_length,
854 u32 expire_walk_interval_ms)
856 ip6_sv_reass_main.timeout_ms = timeout_ms;
857 ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
858 ip6_sv_reass_main.max_reass_n = max_reassemblies;
859 ip6_sv_reass_main.max_reass_len = max_reassembly_length;
860 ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
864 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
865 u32 max_reassembly_length, u32 expire_walk_interval_ms)
867 u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
868 ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
869 max_reassembly_length, expire_walk_interval_ms);
870 vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
871 ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
872 IP6_EVENT_CONFIG_CHANGED, 0);
873 u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
874 if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
876 clib_bihash_48_8_t new_hash;
877 clib_memset (&new_hash, 0, sizeof (new_hash));
878 ip6_rehash_cb_ctx ctx;
880 ctx.new_hash = &new_hash;
881 clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
882 new_nbuckets * 1024);
883 clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
884 ip6_rehash_cb, &ctx);
887 clib_bihash_free_48_8 (&new_hash);
892 clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
893 clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
894 sizeof (ip6_sv_reass_main.hash));
895 clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
902 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
903 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
905 *timeout_ms = ip6_sv_reass_main.timeout_ms;
906 *max_reassemblies = ip6_sv_reass_main.max_reass_n;
907 *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
908 *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
912 static clib_error_t *
913 ip6_sv_reass_init_function (vlib_main_t * vm)
915 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
916 clib_error_t *error = 0;
921 rm->vnet_main = vnet_get_main ();
923 vec_validate (rm->per_thread_data, vlib_num_workers ());
924 ip6_sv_reass_per_thread_t *rt;
925 vec_foreach (rt, rm->per_thread_data)
927 clib_spinlock_init (&rt->lock);
928 pool_alloc (rt->pool, rm->max_reass_n);
929 rt->lru_first = rt->lru_last = ~0;
932 node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
934 rm->ip6_sv_reass_expire_node_idx = node->index;
936 ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
937 IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
938 IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
939 IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
941 nbuckets = ip6_sv_reass_get_nbuckets ();
942 clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
945 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
947 rm->ip6_drop_idx = node->index;
948 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
950 rm->ip6_icmp_error_idx = node->index;
952 if ((error = vlib_call_init_function (vm, ip_main_init)))
955 rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
956 rm->fq_feature_index =
957 vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
959 rm->feature_use_refcount_per_intf = NULL;
964 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
965 #endif /* CLIB_MARCH_VARIANT */
968 ip6_sv_reass_walk_expired (vlib_main_t *vm,
969 CLIB_UNUSED (vlib_node_runtime_t *node),
970 CLIB_UNUSED (vlib_frame_t *f))
972 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
973 uword event_type, *event_data = 0;
977 vlib_process_wait_for_event_or_clock (vm,
978 (f64) rm->expire_walk_interval_ms
979 / (f64) MSEC_PER_SEC);
980 event_type = vlib_process_get_events (vm, &event_data);
985 /* no events => timeout */
987 case IP6_EVENT_CONFIG_CHANGED:
988 /* nothing to do here */
991 clib_warning ("BUG: event type 0x%wx", event_type);
994 f64 now = vlib_time_now (vm);
996 ip6_sv_reass_t *reass;
997 int *pool_indexes_to_free = NULL;
999 uword thread_index = 0;
1001 const uword nthreads = vlib_num_workers () + 1;
1002 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1004 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1005 clib_spinlock_lock (&rt->lock);
1007 vec_reset_length (pool_indexes_to_free);
1009 pool_foreach_index (index, rt->pool) {
1010 reass = pool_elt_at_index (rt->pool, index);
1011 if (now > reass->last_heard + rm->timeout)
1013 vec_add1 (pool_indexes_to_free, index);
1019 vec_foreach (i, pool_indexes_to_free)
1021 ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1022 ip6_sv_reass_free (vm, rm, rt, reass);
1026 clib_spinlock_unlock (&rt->lock);
1029 vec_free (pool_indexes_to_free);
1032 _vec_len (event_data) = 0;
1040 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1041 .function = ip6_sv_reass_walk_expired,
1042 .format_trace = format_ip6_sv_reass_trace,
1043 .type = VLIB_NODE_TYPE_PROCESS,
1044 .name = "ip6-sv-reassembly-expire-walk",
1046 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1047 .error_strings = ip6_sv_reassembly_error_strings,
1053 format_ip6_sv_reass_key (u8 * s, va_list * args)
1055 ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1057 format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1058 key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1059 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1064 format_ip6_sv_reass (u8 * s, va_list * args)
1066 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1067 ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1069 s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1070 reass->id, format_ip6_sv_reass_key, &reass->key,
1071 reass->trace_op_counter);
1075 vec_foreach (bip, reass->cached_buffers)
1080 b = vlib_get_buffer (vm, bi);
1081 s = format (s, " #%03u: bi: %u\n", counter, bi);
1083 bi = b->next_buffer;
1085 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1090 static clib_error_t *
1091 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1092 CLIB_UNUSED (vlib_cli_command_t * lmd))
1094 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1096 vlib_cli_output (vm, "---------------------");
1097 vlib_cli_output (vm, "IP6 reassembly status");
1098 vlib_cli_output (vm, "---------------------");
1099 bool details = false;
1100 if (unformat (input, "details"))
1105 u32 sum_reass_n = 0;
1106 u64 sum_buffers_n = 0;
1107 ip6_sv_reass_t *reass;
1109 const uword nthreads = vlib_num_workers () + 1;
1110 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1112 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1113 clib_spinlock_lock (&rt->lock);
1117 pool_foreach (reass, rt->pool) {
1118 vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1122 sum_reass_n += rt->reass_n;
1123 clib_spinlock_unlock (&rt->lock);
1125 vlib_cli_output (vm, "---------------------");
1126 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1127 (long unsigned) sum_reass_n);
1128 vlib_cli_output (vm,
1129 "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1130 (long unsigned) rm->max_reass_n);
1131 vlib_cli_output (vm,
1132 "Maximum configured amount of fragments per shallow "
1133 "virtual IP6 reassembly: %lu\n",
1134 (long unsigned) rm->max_reass_len);
1135 vlib_cli_output (vm,
1136 "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1137 (long unsigned) rm->timeout_ms);
1138 vlib_cli_output (vm,
1139 "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1140 (long unsigned) rm->expire_walk_interval_ms);
1141 vlib_cli_output (vm, "Buffers in use: %lu\n",
1142 (long unsigned) sum_buffers_n);
1147 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1148 .path = "show ip6-sv-reassembly",
1149 .short_help = "show ip6-sv-reassembly [details]",
1150 .function = show_ip6_sv_reass,
1154 #ifndef CLIB_MARCH_VARIANT
1156 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1158 return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1161 #endif /* CLIB_MARCH_VARIANT */
1163 #define foreach_ip6_sv_reassembly_handoff_error \
1164 _(CONGESTION_DROP, "congestion drop")
1169 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1170 foreach_ip6_sv_reassembly_handoff_error
1172 IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1173 } ip6_sv_reassembly_handoff_error_t;
1175 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1176 #define _(sym,string) string,
1177 foreach_ip6_sv_reassembly_handoff_error
1183 u32 next_worker_index;
1184 } ip6_sv_reassembly_handoff_trace_t;
1187 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1189 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1190 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1191 ip6_sv_reassembly_handoff_trace_t *t =
1192 va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1195 format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1196 t->next_worker_index);
1202 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1203 vlib_node_runtime_t * node,
1204 vlib_frame_t * frame, bool is_feature)
1206 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1208 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1209 u32 n_enq, n_left_from, *from;
1210 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1213 from = vlib_frame_vector_args (frame);
1214 n_left_from = frame->n_vectors;
1215 vlib_get_buffers (vm, from, bufs, n_left_from);
1218 ti = thread_indices;
1220 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1222 while (n_left_from > 0)
1224 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1227 ((node->flags & VLIB_NODE_FLAG_TRACE)
1228 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1230 ip6_sv_reassembly_handoff_trace_t *t =
1231 vlib_add_trace (vm, node, b[0], sizeof (*t));
1232 t->next_worker_index = ti[0];
1239 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1240 thread_indices, frame->n_vectors, 1);
1242 if (n_enq < frame->n_vectors)
1243 vlib_node_increment_counter (vm, node->node_index,
1244 IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1245 frame->n_vectors - n_enq);
1246 return frame->n_vectors;
1249 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1250 vlib_node_runtime_t * node,
1251 vlib_frame_t * frame)
1253 return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1254 false /* is_feature */ );
1258 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1259 .name = "ip6-sv-reassembly-handoff",
1260 .vector_size = sizeof (u32),
1261 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1262 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1263 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1273 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1274 vlib_node_runtime_t * node, vlib_frame_t * frame)
1276 return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1281 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1282 .name = "ip6-sv-reass-feature-hoff",
1283 .vector_size = sizeof (u32),
1284 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1285 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1286 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1296 #ifndef CLIB_MARCH_VARIANT
1298 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1300 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1301 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1304 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1306 ++rm->feature_use_refcount_per_intf[sw_if_index];
1307 return vnet_feature_enable_disable ("ip6-unicast",
1308 "ip6-sv-reassembly-feature",
1309 sw_if_index, 1, 0, 0);
1311 ++rm->feature_use_refcount_per_intf[sw_if_index];
1315 --rm->feature_use_refcount_per_intf[sw_if_index];
1316 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1317 return vnet_feature_enable_disable ("ip6-unicast",
1318 "ip6-sv-reassembly-feature",
1319 sw_if_index, 0, 0, 0);
1326 * fd.io coding-style-patch-verification: ON
1329 * eval: (c-set-style "gnu")