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_main_t * rm,
226 ip6_sv_reass_t * reass, u32 bi,
227 ip6_sv_reass_trace_operation_e action,
228 u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
230 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
231 ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
234 t->reass_id = reass->id;
235 t->op_id = reass->trace_op_counter;
236 ++reass->trace_op_counter;
239 t->ip_proto = ip_proto;
240 t->l4_src_port = l4_src_port;
241 t->l4_dst_port = l4_dst_port;
244 s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
245 printf ("%.*s\n", vec_len (s), s);
247 vec_reset_length (s);
252 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
253 ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
255 clib_bihash_kv_48_8_t kv;
256 kv.key[0] = reass->key.as_u64[0];
257 kv.key[1] = reass->key.as_u64[1];
258 kv.key[2] = reass->key.as_u64[2];
259 kv.key[3] = reass->key.as_u64[3];
260 kv.key[4] = reass->key.as_u64[4];
261 kv.key[5] = reass->key.as_u64[5];
262 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
263 vlib_buffer_free (vm, reass->cached_buffers,
264 vec_len (reass->cached_buffers));
265 vec_free (reass->cached_buffers);
266 reass->cached_buffers = NULL;
267 if (~0 != reass->lru_prev)
269 ip6_sv_reass_t *lru_prev =
270 pool_elt_at_index (rt->pool, reass->lru_prev);
271 lru_prev->lru_next = reass->lru_next;
273 if (~0 != reass->lru_next)
275 ip6_sv_reass_t *lru_next =
276 pool_elt_at_index (rt->pool, reass->lru_next);
277 lru_next->lru_prev = reass->lru_prev;
279 if (rt->lru_first == reass - rt->pool)
281 rt->lru_first = reass->lru_next;
283 if (rt->lru_last == reass - rt->pool)
285 rt->lru_last = reass->lru_prev;
287 pool_put (rt->pool, reass);
292 ip6_sv_reass_init (ip6_sv_reass_t * reass)
294 reass->cached_buffers = NULL;
295 reass->is_complete = false;
298 always_inline ip6_sv_reass_t *
299 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
300 ip6_sv_reass_main_t * rm,
301 ip6_sv_reass_per_thread_t * rt,
302 ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
305 ip6_sv_reass_t *reass = NULL;
306 f64 now = vlib_time_now (vm);
308 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
310 if (vm->thread_index != kv->v.thread_index)
315 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
317 if (now > reass->last_heard + rm->timeout)
319 ip6_sv_reass_free (vm, rm, rt, reass);
326 reass->last_heard = now;
330 if (rt->reass_n >= rm->max_reass_n)
332 reass = pool_elt_at_index (rt->pool, rt->lru_first);
333 ip6_sv_reass_free (vm, rm, rt, reass);
336 pool_get (rt->pool, reass);
337 clib_memset (reass, 0, sizeof (*reass));
338 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
340 ip6_sv_reass_init (reass);
343 reass->lru_prev = reass->lru_next = ~0;
345 if (~0 != rt->lru_last)
347 ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
348 reass->lru_prev = rt->lru_last;
349 lru_last->lru_next = rt->lru_last = reass - rt->pool;
352 if (~0 == rt->lru_first)
354 rt->lru_first = rt->lru_last = reass - rt->pool;
357 reass->key.as_u64[0] = kv->kv.key[0];
358 reass->key.as_u64[1] = kv->kv.key[1];
359 reass->key.as_u64[2] = kv->kv.key[2];
360 reass->key.as_u64[3] = kv->kv.key[3];
361 reass->key.as_u64[4] = kv->kv.key[4];
362 reass->key.as_u64[5] = kv->kv.key[5];
363 kv->v.reass_index = (reass - rt->pool);
364 kv->v.thread_index = vm->thread_index;
365 reass->last_heard = now;
367 if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
369 ip6_sv_reass_free (vm, rm, rt, reass);
376 always_inline ip6_sv_reass_rc_t
377 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
378 ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
379 ip6_sv_reass_t * reass, u32 bi0,
380 ip6_frag_hdr_t * frag_hdr)
382 vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
383 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
384 fvnb->ip.reass.ip6_frag_hdr_offset =
385 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
386 ip6_header_t *fip = vlib_buffer_get_current (fb);
387 if (fb->current_length < sizeof (*fip) ||
388 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
389 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
391 return IP6_SV_REASS_RC_INTERNAL_ERROR;
394 u32 fragment_first = fvnb->ip.reass.fragment_first =
395 ip6_frag_hdr_offset_bytes (frag_hdr);
396 u32 fragment_length =
397 vlib_buffer_length_in_chain (vm, fb) -
398 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
399 u32 fragment_last = fvnb->ip.reass.fragment_last =
400 fragment_first + fragment_length - 1;
401 fvnb->ip.reass.range_first = fragment_first;
402 fvnb->ip.reass.range_last = fragment_last;
403 fvnb->ip.reass.next_range_bi = ~0;
404 if (0 == fragment_first)
407 (vm, fb, fip, fb->current_length, &reass->ip_proto,
408 &reass->l4_src_port, &reass->l4_dst_port,
409 &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
410 &reass->tcp_seq_number))
411 return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
413 reass->is_complete = true;
414 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
415 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
417 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
418 reass->ip_proto, reass->l4_src_port,
422 vec_add1 (reass->cached_buffers, bi0);
423 if (!reass->is_complete)
425 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
427 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
428 REASS_FRAGMENT_CACHE, reass->ip_proto,
429 reass->l4_src_port, reass->l4_dst_port);
431 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
433 return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
436 return IP6_SV_REASS_RC_OK;
440 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
442 ip6_frag_hdr_t * frag_hdr)
444 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
445 while (ip6_ext_hdr (tmp->next_hdr))
447 tmp = ip6_ext_next_header (tmp);
449 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
451 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
452 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
454 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
462 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
463 vlib_node_runtime_t * node,
465 ip6_frag_hdr_t * frag_hdr)
467 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
468 ip6_header_t *ip = vlib_buffer_get_current (b);
469 int more_fragments = ip6_frag_hdr_more (frag_hdr);
470 u32 fragment_length =
471 vlib_buffer_length_in_chain (vm, b) -
472 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
473 if (more_fragments && 0 != fragment_length % 8)
475 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
476 ICMP6_parameter_problem_erroneous_header_field,
477 (u8 *) & ip->payload_length - (u8 *) ip);
484 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
485 vlib_node_runtime_t * node,
487 ip6_frag_hdr_t * frag_hdr)
489 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
490 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
491 u32 fragment_length =
492 vlib_buffer_length_in_chain (vm, b) -
493 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
494 if (fragment_first + fragment_length > 65535)
496 ip6_header_t *ip0 = vlib_buffer_get_current (b);
497 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
498 ICMP6_parameter_problem_erroneous_header_field,
499 (u8 *) & frag_hdr->fragment_offset_and_more
507 ip6_sv_reassembly_inline (vlib_main_t * vm,
508 vlib_node_runtime_t * node,
509 vlib_frame_t * frame, bool is_feature)
511 u32 *from = vlib_frame_vector_args (frame);
512 u32 n_left_from, n_left_to_next, *to_next, next_index;
513 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
514 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
515 clib_spinlock_lock (&rt->lock);
517 n_left_from = frame->n_vectors;
518 next_index = node->cached_next_index;
520 while (n_left_from > 0)
522 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
524 while (n_left_from > 0 && n_left_to_next > 0)
528 u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
529 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 (vm, node, rm, NULL, bi0,
568 vnet_buffer (b0)->ip.reass.ip_proto,
569 vnet_buffer (b0)->ip.
571 vnet_buffer (b0)->ip.
576 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
577 (u8 *) frag_hdr - (u8 *) ip0;
578 if (0 == ip6_frag_hdr_offset (frag_hdr))
580 // first fragment - verify upper-layer is present
581 if (!ip6_sv_reass_verify_upper_layer_present
582 (node, b0, frag_hdr))
584 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
588 if (!ip6_sv_reass_verify_fragment_multiple_8
589 (vm, node, b0, frag_hdr)
590 || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
593 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
597 ip6_sv_reass_kv_t kv;
600 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
601 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
602 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
603 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
605 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
606 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
607 (u64) frag_hdr->identification;
608 kv.k.as_u64[5] = ip0->protocol;
610 ip6_sv_reass_t *reass =
611 ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
614 if (PREDICT_FALSE (do_handoff))
616 next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
617 vnet_buffer (b0)->ip.reass.owner_thread_index =
624 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
625 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
626 b0->error = node->errors[error0];
630 if (reass->is_complete)
632 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
633 ! !ip6_frag_hdr_offset (frag_hdr);
634 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
635 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
636 reass->icmp_type_or_tcp_flags;
637 vnet_buffer (b0)->ip.reass.tcp_ack_number =
638 reass->tcp_ack_number;
639 vnet_buffer (b0)->ip.reass.tcp_seq_number =
640 reass->tcp_seq_number;
641 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
642 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
643 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
644 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
646 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
647 REASS_FRAGMENT_FORWARD,
655 switch (ip6_sv_reass_update
656 (vm, node, rm, rt, reass, bi0, frag_hdr))
658 case IP6_SV_REASS_RC_OK:
659 /* nothing to do here */
661 case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
662 vlib_node_increment_counter (vm, node->node_index,
663 IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
665 ip6_sv_reass_free (vm, rm, rt, reass);
668 case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
669 vlib_node_increment_counter (vm, node->node_index,
670 IP6_ERROR_REASS_UNSUPP_IP_PROTO,
672 ip6_sv_reass_free (vm, rm, rt, reass);
675 case IP6_SV_REASS_RC_INTERNAL_ERROR:
676 vlib_node_increment_counter (vm, node->node_index,
677 IP6_ERROR_REASS_INTERNAL_ERROR, 1);
678 ip6_sv_reass_free (vm, rm, rt, reass);
683 if (reass->is_complete)
686 vec_foreach_index (idx, reass->cached_buffers)
688 u32 bi0 = vec_elt (reass->cached_buffers, idx);
689 if (0 == n_left_to_next)
691 vlib_put_next_frame (vm, node, next_index,
693 vlib_get_next_frame (vm, node, next_index, to_next,
699 b0 = vlib_get_buffer (vm, bi0);
702 vnet_feature_next (&next0, b0);
705 vlib_buffer_get_current (b0) +
706 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
707 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
708 ! !ip6_frag_hdr_offset (frag_hdr);
709 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
710 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
711 reass->icmp_type_or_tcp_flags;
712 vnet_buffer (b0)->ip.reass.tcp_ack_number =
713 reass->tcp_ack_number;
714 vnet_buffer (b0)->ip.reass.tcp_seq_number =
715 reass->tcp_seq_number;
716 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
717 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
718 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
720 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
721 REASS_FRAGMENT_FORWARD,
726 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
727 to_next, n_left_to_next, bi0,
730 _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
738 if (is_feature && IP6_ERROR_NONE == error0)
740 b0 = vlib_get_buffer (vm, bi0);
741 vnet_feature_next (&next0, b0);
743 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
744 n_left_to_next, bi0, next0);
748 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
749 to_next[0] = icmp_bi;
752 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
753 n_left_to_next, icmp_bi,
762 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
765 clib_spinlock_unlock (&rt->lock);
766 return frame->n_vectors;
769 static char *ip6_sv_reassembly_error_strings[] = {
770 #define _(sym, string) string,
775 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
776 vlib_node_runtime_t * node,
777 vlib_frame_t * frame)
779 return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
783 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
784 .name = "ip6-sv-reassembly",
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-reassembly-handoff",
800 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
801 vlib_node_runtime_t * node,
802 vlib_frame_t * frame)
804 return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
808 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
809 .name = "ip6-sv-reassembly-feature",
810 .vector_size = sizeof (u32),
811 .format_trace = format_ip6_sv_reass_trace,
812 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
813 .error_strings = ip6_sv_reassembly_error_strings,
814 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
817 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
818 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
819 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
820 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
826 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
827 .arc_name = "ip6-unicast",
828 .node_name = "ip6-sv-reassembly-feature",
829 .runs_before = VNET_FEATURES ("ip6-lookup"),
834 #ifndef CLIB_MARCH_VARIANT
836 ip6_sv_reass_get_nbuckets ()
838 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
842 nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
844 for (i = 0; i < 31; i++)
845 if ((1 << i) >= nbuckets)
851 #endif /* CLIB_MARCH_VARIANT */
855 IP6_EVENT_CONFIG_CHANGED = 1,
856 } ip6_sv_reass_event_t;
858 #ifndef CLIB_MARCH_VARIANT
862 clib_bihash_48_8_t *new_hash;
866 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
868 ip6_rehash_cb_ctx *ctx = _ctx;
869 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
873 return (BIHASH_WALK_CONTINUE);
877 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
878 u32 max_reassembly_length,
879 u32 expire_walk_interval_ms)
881 ip6_sv_reass_main.timeout_ms = timeout_ms;
882 ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
883 ip6_sv_reass_main.max_reass_n = max_reassemblies;
884 ip6_sv_reass_main.max_reass_len = max_reassembly_length;
885 ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
889 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
890 u32 max_reassembly_length, u32 expire_walk_interval_ms)
892 u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
893 ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
894 max_reassembly_length, expire_walk_interval_ms);
895 vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
896 ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
897 IP6_EVENT_CONFIG_CHANGED, 0);
898 u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
899 if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
901 clib_bihash_48_8_t new_hash;
902 clib_memset (&new_hash, 0, sizeof (new_hash));
903 ip6_rehash_cb_ctx ctx;
905 ctx.new_hash = &new_hash;
906 clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
907 new_nbuckets * 1024);
908 clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
909 ip6_rehash_cb, &ctx);
912 clib_bihash_free_48_8 (&new_hash);
917 clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
918 clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
919 sizeof (ip6_sv_reass_main.hash));
920 clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
927 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
928 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
930 *timeout_ms = ip6_sv_reass_main.timeout_ms;
931 *max_reassemblies = ip6_sv_reass_main.max_reass_n;
932 *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
933 *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
937 static clib_error_t *
938 ip6_sv_reass_init_function (vlib_main_t * vm)
940 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
941 clib_error_t *error = 0;
946 rm->vnet_main = vnet_get_main ();
948 vec_validate (rm->per_thread_data, vlib_num_workers ());
949 ip6_sv_reass_per_thread_t *rt;
950 vec_foreach (rt, rm->per_thread_data)
952 clib_spinlock_init (&rt->lock);
953 pool_alloc (rt->pool, rm->max_reass_n);
954 rt->lru_first = rt->lru_last = ~0;
957 node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
959 rm->ip6_sv_reass_expire_node_idx = node->index;
961 ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
962 IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
963 IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
964 IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
966 nbuckets = ip6_sv_reass_get_nbuckets ();
967 clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
970 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
972 rm->ip6_drop_idx = node->index;
973 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
975 rm->ip6_icmp_error_idx = node->index;
977 if ((error = vlib_call_init_function (vm, ip_main_init)))
979 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
980 ip6_sv_reass_node.index);
982 rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
983 rm->fq_feature_index =
984 vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
986 rm->feature_use_refcount_per_intf = NULL;
991 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
992 #endif /* CLIB_MARCH_VARIANT */
995 ip6_sv_reass_walk_expired (vlib_main_t * vm,
996 vlib_node_runtime_t * node, vlib_frame_t * f)
998 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
999 uword event_type, *event_data = 0;
1003 vlib_process_wait_for_event_or_clock (vm,
1004 (f64) rm->expire_walk_interval_ms
1005 / (f64) MSEC_PER_SEC);
1006 event_type = vlib_process_get_events (vm, &event_data);
1010 case ~0: /* no events => timeout */
1011 /* nothing to do here */
1013 case IP6_EVENT_CONFIG_CHANGED:
1016 clib_warning ("BUG: event type 0x%wx", event_type);
1019 f64 now = vlib_time_now (vm);
1021 ip6_sv_reass_t *reass;
1022 int *pool_indexes_to_free = NULL;
1024 uword thread_index = 0;
1026 const uword nthreads = vlib_num_workers () + 1;
1027 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1029 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1030 clib_spinlock_lock (&rt->lock);
1032 vec_reset_length (pool_indexes_to_free);
1034 pool_foreach_index (index, rt->pool, ({
1035 reass = pool_elt_at_index (rt->pool, index);
1036 if (now > reass->last_heard + rm->timeout)
1038 vec_add1 (pool_indexes_to_free, index);
1044 vec_foreach (i, pool_indexes_to_free)
1046 ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1047 ip6_sv_reass_free (vm, rm, rt, reass);
1051 clib_spinlock_unlock (&rt->lock);
1054 vec_free (pool_indexes_to_free);
1057 _vec_len (event_data) = 0;
1065 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1066 .function = ip6_sv_reass_walk_expired,
1067 .format_trace = format_ip6_sv_reass_trace,
1068 .type = VLIB_NODE_TYPE_PROCESS,
1069 .name = "ip6-sv-reassembly-expire-walk",
1071 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1072 .error_strings = ip6_sv_reassembly_error_strings,
1078 format_ip6_sv_reass_key (u8 * s, va_list * args)
1080 ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1081 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1082 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1083 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1088 format_ip6_sv_reass (u8 * s, va_list * args)
1090 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1091 ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1093 s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1094 reass->id, format_ip6_sv_reass_key, &reass->key,
1095 reass->trace_op_counter);
1099 vec_foreach (bip, reass->cached_buffers)
1104 b = vlib_get_buffer (vm, bi);
1105 s = format (s, " #%03u: bi: %u\n", counter, bi);
1107 bi = b->next_buffer;
1109 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1114 static clib_error_t *
1115 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1116 CLIB_UNUSED (vlib_cli_command_t * lmd))
1118 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1120 vlib_cli_output (vm, "---------------------");
1121 vlib_cli_output (vm, "IP6 reassembly status");
1122 vlib_cli_output (vm, "---------------------");
1123 bool details = false;
1124 if (unformat (input, "details"))
1129 u32 sum_reass_n = 0;
1130 u64 sum_buffers_n = 0;
1131 ip6_sv_reass_t *reass;
1133 const uword nthreads = vlib_num_workers () + 1;
1134 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1136 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1137 clib_spinlock_lock (&rt->lock);
1141 pool_foreach (reass, rt->pool, {
1142 vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1146 sum_reass_n += rt->reass_n;
1147 clib_spinlock_unlock (&rt->lock);
1149 vlib_cli_output (vm, "---------------------");
1150 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1151 (long unsigned) sum_reass_n);
1152 vlib_cli_output (vm,
1153 "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1154 (long unsigned) rm->max_reass_n);
1155 vlib_cli_output (vm,
1156 "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1157 (long unsigned) rm->timeout_ms);
1158 vlib_cli_output (vm,
1159 "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1160 (long unsigned) rm->expire_walk_interval_ms);
1161 vlib_cli_output (vm, "Buffers in use: %lu\n",
1162 (long unsigned) sum_buffers_n);
1167 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1168 .path = "show ip6-sv-reassembly",
1169 .short_help = "show ip6-sv-reassembly [details]",
1170 .function = show_ip6_sv_reass,
1174 #ifndef CLIB_MARCH_VARIANT
1176 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1178 return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1181 #endif /* CLIB_MARCH_VARIANT */
1183 #define foreach_ip6_sv_reassembly_handoff_error \
1184 _(CONGESTION_DROP, "congestion drop")
1189 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1190 foreach_ip6_sv_reassembly_handoff_error
1192 IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1193 } ip6_sv_reassembly_handoff_error_t;
1195 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1196 #define _(sym,string) string,
1197 foreach_ip6_sv_reassembly_handoff_error
1203 u32 next_worker_index;
1204 } ip6_sv_reassembly_handoff_trace_t;
1207 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1209 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1210 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1211 ip6_sv_reassembly_handoff_trace_t *t =
1212 va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1215 format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1216 t->next_worker_index);
1222 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1223 vlib_node_runtime_t * node,
1224 vlib_frame_t * frame, bool is_feature)
1226 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1228 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1229 u32 n_enq, n_left_from, *from;
1230 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1233 from = vlib_frame_vector_args (frame);
1234 n_left_from = frame->n_vectors;
1235 vlib_get_buffers (vm, from, bufs, n_left_from);
1238 ti = thread_indices;
1240 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1242 while (n_left_from > 0)
1244 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1247 ((node->flags & VLIB_NODE_FLAG_TRACE)
1248 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1250 ip6_sv_reassembly_handoff_trace_t *t =
1251 vlib_add_trace (vm, node, b[0], sizeof (*t));
1252 t->next_worker_index = ti[0];
1260 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1261 frame->n_vectors, 1);
1263 if (n_enq < frame->n_vectors)
1264 vlib_node_increment_counter (vm, node->node_index,
1265 IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1266 frame->n_vectors - n_enq);
1267 return frame->n_vectors;
1270 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1271 vlib_node_runtime_t * node,
1272 vlib_frame_t * frame)
1274 return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1275 false /* is_feature */ );
1279 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1280 .name = "ip6-sv-reassembly-handoff",
1281 .vector_size = sizeof (u32),
1282 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1283 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1284 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1294 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1295 vlib_node_runtime_t * node, vlib_frame_t * frame)
1297 return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1302 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1303 .name = "ip6-sv-reass-feature-hoff",
1304 .vector_size = sizeof (u32),
1305 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1306 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1307 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1317 #ifndef CLIB_MARCH_VARIANT
1319 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1321 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1322 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1325 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1327 ++rm->feature_use_refcount_per_intf[sw_if_index];
1328 return vnet_feature_enable_disable ("ip6-unicast",
1329 "ip6-sv-reassembly-feature",
1330 sw_if_index, 1, 0, 0);
1332 ++rm->feature_use_refcount_per_intf[sw_if_index];
1336 --rm->feature_use_refcount_per_intf[sw_if_index];
1337 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1338 return vnet_feature_enable_disable ("ip6-unicast",
1339 "ip6-sv-reassembly-feature",
1340 sw_if_index, 0, 0, 0);
1347 * fd.io coding-style-patch-verification: ON
1350 * eval: (c-set-style "gnu")