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>
29 #include <vnet/ip/ip6_inlines.h>
31 #define MSEC_PER_SEC 1000
32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
41 IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
42 IP6_SV_REASS_RC_INTERNAL_ERROR,
43 IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
44 IP6_SV_REASS_RC_INVALID_FRAG_LEN,
81 clib_bihash_kv_48_8_t kv;
87 ip6_sv_reass_key_t key;
88 // time when last packet was received
90 // internal id of this reassembly
92 // trace operation counter
94 // buffer indexes of buffers in this reassembly in chronological order -
95 // including overlaps and duplicate fragments
97 // set to true when this reassembly is completed
101 u8 icmp_type_or_tcp_flags;
115 ip6_sv_reass_t *pool;
118 clib_spinlock_t lock;
122 } ip6_sv_reass_per_thread_t;
129 u32 expire_walk_interval_ms;
130 // maximum number of fragments in one reassembly
132 // maximum number of reassemblies
136 clib_bihash_48_8_t hash;
139 ip6_sv_reass_per_thread_t *per_thread_data;
142 vlib_main_t *vlib_main;
143 vnet_main_t *vnet_main;
145 // node index of ip6-drop node
147 u32 ip6_icmp_error_idx;
148 u32 ip6_sv_reass_expire_node_idx;
150 /** Worker handoff */
152 u32 fq_feature_index;
154 // reference count for enabling/disabling feature - per interface
155 u32 *feature_use_refcount_per_intf;
156 } ip6_sv_reass_main_t;
158 extern ip6_sv_reass_main_t ip6_sv_reass_main;
160 #ifndef CLIB_MARCH_VARIANT
161 ip6_sv_reass_main_t ip6_sv_reass_main;
162 #endif /* CLIB_MARCH_VARIANT */
166 IP6_SV_REASSEMBLY_NEXT_INPUT,
167 IP6_SV_REASSEMBLY_NEXT_DROP,
168 IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
169 IP6_SV_REASSEMBLY_NEXT_HANDOFF,
170 IP6_SV_REASSEMBLY_N_NEXT,
171 } ip6_sv_reass_next_t;
175 REASS_FRAGMENT_CACHE,
177 REASS_FRAGMENT_FORWARD,
179 } ip6_sv_reass_trace_operation_e;
183 ip6_sv_reass_trace_operation_e action;
189 } ip6_sv_reass_trace_t;
192 format_ip6_sv_reass_trace (u8 * s, va_list * args)
194 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
195 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
196 ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
197 if (REASS_PASSTHROUGH != t->action)
199 s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
203 case REASS_FRAGMENT_CACHE:
204 s = format (s, "[cached]");
208 format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
209 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
210 clib_net_to_host_u16 (t->l4_dst_port));
212 case REASS_FRAGMENT_FORWARD:
214 format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
215 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
216 clib_net_to_host_u16 (t->l4_dst_port));
218 case REASS_PASSTHROUGH:
219 s = format (s, "[not fragmented or atomic fragment]");
226 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
227 ip6_sv_reass_t * reass, u32 bi,
228 ip6_sv_reass_trace_operation_e action,
229 u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
231 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
232 if (pool_is_free_index
233 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
235 // this buffer's trace is gone
236 b->flags &= ~VLIB_BUFFER_IS_TRACED;
239 ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
242 t->reass_id = reass->id;
243 t->op_id = reass->trace_op_counter;
244 ++reass->trace_op_counter;
247 t->ip_proto = ip_proto;
248 t->l4_src_port = l4_src_port;
249 t->l4_dst_port = l4_dst_port;
252 s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
253 printf ("%.*s\n", vec_len (s), s);
255 vec_reset_length (s);
260 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
261 ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
263 clib_bihash_kv_48_8_t kv;
264 kv.key[0] = reass->key.as_u64[0];
265 kv.key[1] = reass->key.as_u64[1];
266 kv.key[2] = reass->key.as_u64[2];
267 kv.key[3] = reass->key.as_u64[3];
268 kv.key[4] = reass->key.as_u64[4];
269 kv.key[5] = reass->key.as_u64[5];
270 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
271 vlib_buffer_free (vm, reass->cached_buffers,
272 vec_len (reass->cached_buffers));
273 vec_free (reass->cached_buffers);
274 reass->cached_buffers = NULL;
275 if (~0 != reass->lru_prev)
277 ip6_sv_reass_t *lru_prev =
278 pool_elt_at_index (rt->pool, reass->lru_prev);
279 lru_prev->lru_next = reass->lru_next;
281 if (~0 != reass->lru_next)
283 ip6_sv_reass_t *lru_next =
284 pool_elt_at_index (rt->pool, reass->lru_next);
285 lru_next->lru_prev = reass->lru_prev;
287 if (rt->lru_first == reass - rt->pool)
289 rt->lru_first = reass->lru_next;
291 if (rt->lru_last == reass - rt->pool)
293 rt->lru_last = reass->lru_prev;
295 pool_put (rt->pool, reass);
300 ip6_sv_reass_init (ip6_sv_reass_t * reass)
302 reass->cached_buffers = NULL;
303 reass->is_complete = false;
306 always_inline ip6_sv_reass_t *
307 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
308 ip6_sv_reass_per_thread_t *rt,
309 ip6_sv_reass_kv_t *kv, u8 *do_handoff)
311 ip6_sv_reass_t *reass = NULL;
312 f64 now = vlib_time_now (vm);
316 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
318 if (vm->thread_index != kv->v.thread_index)
323 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
325 if (now > reass->last_heard + rm->timeout)
327 ip6_sv_reass_free (vm, rm, rt, reass);
334 reass->last_heard = now;
338 if (rt->reass_n >= rm->max_reass_n)
340 reass = pool_elt_at_index (rt->pool, rt->lru_first);
341 ip6_sv_reass_free (vm, rm, rt, reass);
344 pool_get (rt->pool, reass);
345 clib_memset (reass, 0, sizeof (*reass));
346 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
348 ip6_sv_reass_init (reass);
351 reass->lru_prev = reass->lru_next = ~0;
353 if (~0 != rt->lru_last)
355 ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
356 reass->lru_prev = rt->lru_last;
357 lru_last->lru_next = rt->lru_last = reass - rt->pool;
360 if (~0 == rt->lru_first)
362 rt->lru_first = rt->lru_last = reass - rt->pool;
365 reass->key.as_u64[0] = kv->kv.key[0];
366 reass->key.as_u64[1] = kv->kv.key[1];
367 reass->key.as_u64[2] = kv->kv.key[2];
368 reass->key.as_u64[3] = kv->kv.key[3];
369 reass->key.as_u64[4] = kv->kv.key[4];
370 reass->key.as_u64[5] = kv->kv.key[5];
371 kv->v.reass_index = (reass - rt->pool);
372 kv->v.thread_index = vm->thread_index;
373 reass->last_heard = now;
375 int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
378 ip6_sv_reass_free (vm, rm, rt, reass);
380 // if other worker created a context already work with the other copy
388 always_inline ip6_sv_reass_rc_t
389 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
390 ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
391 ip6_frag_hdr_t *frag_hdr)
393 vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
394 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
395 fvnb->ip.reass.ip6_frag_hdr_offset =
396 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
397 ip6_header_t *fip = vlib_buffer_get_current (fb);
398 if (fb->current_length < sizeof (*fip) ||
399 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
400 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
402 return IP6_SV_REASS_RC_INTERNAL_ERROR;
405 u32 fragment_first = fvnb->ip.reass.fragment_first =
406 ip6_frag_hdr_offset_bytes (frag_hdr);
407 u32 fragment_length =
408 vlib_buffer_length_in_chain (vm, fb) -
409 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
410 if (0 == fragment_length)
412 return IP6_SV_REASS_RC_INVALID_FRAG_LEN;
414 u32 fragment_last = fvnb->ip.reass.fragment_last =
415 fragment_first + fragment_length - 1;
416 fvnb->ip.reass.range_first = fragment_first;
417 fvnb->ip.reass.range_last = fragment_last;
418 fvnb->ip.reass.next_range_bi = ~0;
419 if (0 == fragment_first)
422 (vm, fb, fip, fb->current_length, &reass->ip_proto,
423 &reass->l4_src_port, &reass->l4_dst_port,
424 &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
425 &reass->tcp_seq_number))
426 return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
428 reass->is_complete = true;
429 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
430 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
432 ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
433 reass->ip_proto, reass->l4_src_port,
437 vec_add1 (reass->cached_buffers, bi0);
438 if (!reass->is_complete)
440 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
442 ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
443 reass->ip_proto, reass->l4_src_port,
446 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
448 return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
451 return IP6_SV_REASS_RC_OK;
455 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
457 ip6_ext_hdr_chain_t *hc)
459 int nh = hc->eh[hc->length - 1].protocol;
460 /* Checking to see if it's a terminating header */
461 if (ip6_ext_hdr (nh))
463 icmp6_error_set_vnet_buffer (
464 b, ICMP6_parameter_problem,
465 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
466 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
473 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
475 ip6_frag_hdr_t * frag_hdr)
477 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
478 ip6_header_t *ip = vlib_buffer_get_current (b);
479 int more_fragments = ip6_frag_hdr_more (frag_hdr);
480 u32 fragment_length =
481 vlib_buffer_length_in_chain (vm, b) -
482 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
483 if (more_fragments && 0 != fragment_length % 8)
485 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
486 ICMP6_parameter_problem_erroneous_header_field,
487 (u8 *) & ip->payload_length - (u8 *) ip);
494 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
496 ip6_frag_hdr_t * frag_hdr)
498 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
499 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
500 u32 fragment_length =
501 vlib_buffer_length_in_chain (vm, b) -
502 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
503 if (fragment_first + fragment_length > 65535)
505 ip6_header_t *ip0 = vlib_buffer_get_current (b);
506 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
507 ICMP6_parameter_problem_erroneous_header_field,
508 (u8 *) & frag_hdr->fragment_offset_and_more
516 ip6_sv_reassembly_inline (vlib_main_t * vm,
517 vlib_node_runtime_t * node,
518 vlib_frame_t * frame, bool is_feature)
520 u32 *from = vlib_frame_vector_args (frame);
521 u32 n_left_from, n_left_to_next, *to_next, next_index;
522 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
523 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
524 clib_spinlock_lock (&rt->lock);
526 n_left_from = frame->n_vectors;
527 next_index = node->cached_next_index;
529 while (n_left_from > 0)
531 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
533 while (n_left_from > 0 && n_left_to_next > 0)
537 u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
538 u32 error0 = IP6_ERROR_NONE;
541 b0 = vlib_get_buffer (vm, bi0);
543 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
544 ip6_frag_hdr_t *frag_hdr;
545 ip6_ext_hdr_chain_t hdr_chain;
546 bool is_atomic_fragment = false;
548 int res = ip6_ext_header_walk (
549 b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
551 hdr_chain.eh[res].protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
554 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
555 is_atomic_fragment = (0 == ip6_frag_hdr_offset (frag_hdr) &&
556 !ip6_frag_hdr_more (frag_hdr));
560 hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION ||
563 // this is a regular unfragmented packet or an atomic fragment
565 (vm, b0, ip0, b0->current_length,
566 &(vnet_buffer (b0)->ip.reass.ip_proto),
567 &(vnet_buffer (b0)->ip.reass.l4_src_port),
568 &(vnet_buffer (b0)->ip.reass.l4_dst_port),
569 &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
570 &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
571 &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
573 error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
574 b0->error = node->errors[error0];
575 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
578 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
579 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
580 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
582 ip6_sv_reass_add_trace (
583 vm, node, NULL, bi0, REASS_PASSTHROUGH,
584 vnet_buffer (b0)->ip.reass.ip_proto,
585 vnet_buffer (b0)->ip.reass.l4_src_port,
586 vnet_buffer (b0)->ip.reass.l4_dst_port);
591 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
592 hdr_chain.eh[res].offset;
594 if (0 == ip6_frag_hdr_offset (frag_hdr))
596 // first fragment - verify upper-layer is present
597 if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
600 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
604 if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
605 !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
607 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
611 ip6_sv_reass_kv_t kv;
614 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
615 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
616 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
617 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
619 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
620 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
621 (u64) frag_hdr->identification;
622 kv.k.as_u64[5] = ip0->protocol;
624 ip6_sv_reass_t *reass =
625 ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
627 if (PREDICT_FALSE (do_handoff))
629 next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
630 vnet_buffer (b0)->ip.reass.owner_thread_index =
637 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
638 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
639 b0->error = node->errors[error0];
643 if (reass->is_complete)
645 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
646 ! !ip6_frag_hdr_offset (frag_hdr);
647 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
648 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
649 reass->icmp_type_or_tcp_flags;
650 vnet_buffer (b0)->ip.reass.tcp_ack_number =
651 reass->tcp_ack_number;
652 vnet_buffer (b0)->ip.reass.tcp_seq_number =
653 reass->tcp_seq_number;
654 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
655 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
656 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
657 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
659 ip6_sv_reass_add_trace (
660 vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
661 reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
667 switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
669 case IP6_SV_REASS_RC_OK:
670 /* nothing to do here */
672 case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
673 counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
675 case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
676 counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
678 case IP6_SV_REASS_RC_INTERNAL_ERROR:
679 counter = IP6_ERROR_REASS_INTERNAL_ERROR;
681 case IP6_SV_REASS_RC_INVALID_FRAG_LEN:
682 counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
687 vlib_node_increment_counter (vm, node->node_index, counter, 1);
688 ip6_sv_reass_free (vm, rm, rt, reass);
692 if (reass->is_complete)
695 vec_foreach_index (idx, reass->cached_buffers)
697 u32 bi0 = vec_elt (reass->cached_buffers, idx);
698 if (0 == n_left_to_next)
700 vlib_put_next_frame (vm, node, next_index,
702 vlib_get_next_frame (vm, node, next_index, to_next,
708 b0 = vlib_get_buffer (vm, bi0);
711 vnet_feature_next (&next0, b0);
714 vlib_buffer_get_current (b0) +
715 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
716 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
717 ! !ip6_frag_hdr_offset (frag_hdr);
718 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
719 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
720 reass->icmp_type_or_tcp_flags;
721 vnet_buffer (b0)->ip.reass.tcp_ack_number =
722 reass->tcp_ack_number;
723 vnet_buffer (b0)->ip.reass.tcp_seq_number =
724 reass->tcp_seq_number;
725 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
726 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
727 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
729 ip6_sv_reass_add_trace (
730 vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
731 reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
733 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
734 to_next, n_left_to_next, bi0,
737 vec_set_len (reass->cached_buffers,
738 0); // buffers are owned by frame now
746 if (is_feature && IP6_ERROR_NONE == error0)
748 b0 = vlib_get_buffer (vm, bi0);
749 vnet_feature_next (&next0, b0);
751 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
752 n_left_to_next, bi0, next0);
759 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
762 clib_spinlock_unlock (&rt->lock);
763 return frame->n_vectors;
766 static char *ip6_sv_reassembly_error_strings[] = {
767 #define _(sym, string) string,
772 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
773 vlib_node_runtime_t * node,
774 vlib_frame_t * frame)
776 return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
780 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
781 .name = "ip6-sv-reassembly",
782 .vector_size = sizeof (u32),
783 .format_trace = format_ip6_sv_reass_trace,
784 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
785 .error_strings = ip6_sv_reassembly_error_strings,
786 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
789 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
790 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
791 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
792 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
797 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
798 vlib_node_runtime_t * node,
799 vlib_frame_t * frame)
801 return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
805 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
806 .name = "ip6-sv-reassembly-feature",
807 .vector_size = sizeof (u32),
808 .format_trace = format_ip6_sv_reass_trace,
809 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
810 .error_strings = ip6_sv_reassembly_error_strings,
811 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
814 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
815 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
816 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
817 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
823 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
824 .arc_name = "ip6-unicast",
825 .node_name = "ip6-sv-reassembly-feature",
826 .runs_before = VNET_FEATURES ("ip6-lookup"),
831 #ifndef CLIB_MARCH_VARIANT
833 ip6_sv_reass_get_nbuckets ()
835 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
839 nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
841 for (i = 0; i < 31; i++)
842 if ((1 << i) >= nbuckets)
848 #endif /* CLIB_MARCH_VARIANT */
852 IP6_EVENT_CONFIG_CHANGED = 1,
853 } ip6_sv_reass_event_t;
855 #ifndef CLIB_MARCH_VARIANT
859 clib_bihash_48_8_t *new_hash;
863 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
865 ip6_rehash_cb_ctx *ctx = _ctx;
866 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
870 return (BIHASH_WALK_CONTINUE);
874 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
875 u32 max_reassembly_length,
876 u32 expire_walk_interval_ms)
878 ip6_sv_reass_main.timeout_ms = timeout_ms;
879 ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
880 ip6_sv_reass_main.max_reass_n = max_reassemblies;
881 ip6_sv_reass_main.max_reass_len = max_reassembly_length;
882 ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
886 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
887 u32 max_reassembly_length, u32 expire_walk_interval_ms)
889 u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
890 ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
891 max_reassembly_length, expire_walk_interval_ms);
892 vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
893 ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
894 IP6_EVENT_CONFIG_CHANGED, 0);
895 u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
896 if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
898 clib_bihash_48_8_t new_hash;
899 clib_memset (&new_hash, 0, sizeof (new_hash));
900 ip6_rehash_cb_ctx ctx;
902 ctx.new_hash = &new_hash;
903 clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
904 new_nbuckets * 1024);
905 clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
906 ip6_rehash_cb, &ctx);
909 clib_bihash_free_48_8 (&new_hash);
914 clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
915 clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
916 sizeof (ip6_sv_reass_main.hash));
917 clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
924 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
925 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
927 *timeout_ms = ip6_sv_reass_main.timeout_ms;
928 *max_reassemblies = ip6_sv_reass_main.max_reass_n;
929 *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
930 *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
934 static clib_error_t *
935 ip6_sv_reass_init_function (vlib_main_t * vm)
937 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
938 clib_error_t *error = 0;
943 rm->vnet_main = vnet_get_main ();
945 vec_validate (rm->per_thread_data, vlib_num_workers ());
946 ip6_sv_reass_per_thread_t *rt;
947 vec_foreach (rt, rm->per_thread_data)
949 clib_spinlock_init (&rt->lock);
950 pool_alloc (rt->pool, rm->max_reass_n);
951 rt->lru_first = rt->lru_last = ~0;
954 node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
956 rm->ip6_sv_reass_expire_node_idx = node->index;
958 ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
959 IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
960 IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
961 IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
963 nbuckets = ip6_sv_reass_get_nbuckets ();
964 clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
967 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
969 rm->ip6_drop_idx = node->index;
970 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
972 rm->ip6_icmp_error_idx = node->index;
974 if ((error = vlib_call_init_function (vm, ip_main_init)))
977 rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
978 rm->fq_feature_index =
979 vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
981 rm->feature_use_refcount_per_intf = NULL;
986 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
987 #endif /* CLIB_MARCH_VARIANT */
990 ip6_sv_reass_walk_expired (vlib_main_t *vm,
991 CLIB_UNUSED (vlib_node_runtime_t *node),
992 CLIB_UNUSED (vlib_frame_t *f))
994 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
995 uword event_type, *event_data = 0;
999 vlib_process_wait_for_event_or_clock (vm,
1000 (f64) rm->expire_walk_interval_ms
1001 / (f64) MSEC_PER_SEC);
1002 event_type = vlib_process_get_events (vm, &event_data);
1007 /* no events => timeout */
1009 case IP6_EVENT_CONFIG_CHANGED:
1010 /* nothing to do here */
1013 clib_warning ("BUG: event type 0x%wx", event_type);
1016 f64 now = vlib_time_now (vm);
1018 ip6_sv_reass_t *reass;
1019 int *pool_indexes_to_free = NULL;
1021 uword thread_index = 0;
1023 const uword nthreads = vlib_num_workers () + 1;
1024 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1026 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1027 clib_spinlock_lock (&rt->lock);
1029 vec_reset_length (pool_indexes_to_free);
1031 pool_foreach_index (index, rt->pool) {
1032 reass = pool_elt_at_index (rt->pool, index);
1033 if (now > reass->last_heard + rm->timeout)
1035 vec_add1 (pool_indexes_to_free, index);
1041 vec_foreach (i, pool_indexes_to_free)
1043 ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1044 ip6_sv_reass_free (vm, rm, rt, reass);
1048 clib_spinlock_unlock (&rt->lock);
1051 vec_free (pool_indexes_to_free);
1054 vec_set_len (event_data, 0);
1062 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1063 .function = ip6_sv_reass_walk_expired,
1064 .format_trace = format_ip6_sv_reass_trace,
1065 .type = VLIB_NODE_TYPE_PROCESS,
1066 .name = "ip6-sv-reassembly-expire-walk",
1068 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1069 .error_strings = ip6_sv_reassembly_error_strings,
1075 format_ip6_sv_reass_key (u8 * s, va_list * args)
1077 ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1079 format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1080 key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1081 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1086 format_ip6_sv_reass (u8 * s, va_list * args)
1088 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1089 ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1091 s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1092 reass->id, format_ip6_sv_reass_key, &reass->key,
1093 reass->trace_op_counter);
1097 vec_foreach (bip, reass->cached_buffers)
1102 b = vlib_get_buffer (vm, bi);
1103 s = format (s, " #%03u: bi: %u\n", counter, bi);
1105 bi = b->next_buffer;
1107 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1112 static clib_error_t *
1113 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1114 CLIB_UNUSED (vlib_cli_command_t * lmd))
1116 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1118 vlib_cli_output (vm, "---------------------");
1119 vlib_cli_output (vm, "IP6 reassembly status");
1120 vlib_cli_output (vm, "---------------------");
1121 bool details = false;
1122 if (unformat (input, "details"))
1127 u32 sum_reass_n = 0;
1128 u64 sum_buffers_n = 0;
1129 ip6_sv_reass_t *reass;
1131 const uword nthreads = vlib_num_workers () + 1;
1132 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1134 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1135 clib_spinlock_lock (&rt->lock);
1139 pool_foreach (reass, rt->pool) {
1140 vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1144 sum_reass_n += rt->reass_n;
1145 clib_spinlock_unlock (&rt->lock);
1147 vlib_cli_output (vm, "---------------------");
1148 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1149 (long unsigned) sum_reass_n);
1150 vlib_cli_output (vm,
1151 "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1152 (long unsigned) rm->max_reass_n);
1153 vlib_cli_output (vm,
1154 "Maximum configured amount of fragments per shallow "
1155 "virtual IP6 reassembly: %lu\n",
1156 (long unsigned) rm->max_reass_len);
1157 vlib_cli_output (vm,
1158 "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1159 (long unsigned) rm->timeout_ms);
1160 vlib_cli_output (vm,
1161 "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1162 (long unsigned) rm->expire_walk_interval_ms);
1163 vlib_cli_output (vm, "Buffers in use: %lu\n",
1164 (long unsigned) sum_buffers_n);
1169 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1170 .path = "show ip6-sv-reassembly",
1171 .short_help = "show ip6-sv-reassembly [details]",
1172 .function = show_ip6_sv_reass,
1176 #ifndef CLIB_MARCH_VARIANT
1178 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1180 return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1183 #endif /* CLIB_MARCH_VARIANT */
1185 #define foreach_ip6_sv_reassembly_handoff_error \
1186 _(CONGESTION_DROP, "congestion drop")
1191 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1192 foreach_ip6_sv_reassembly_handoff_error
1194 IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1195 } ip6_sv_reassembly_handoff_error_t;
1197 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1198 #define _(sym,string) string,
1199 foreach_ip6_sv_reassembly_handoff_error
1205 u32 next_worker_index;
1206 } ip6_sv_reassembly_handoff_trace_t;
1209 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1211 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1212 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1213 ip6_sv_reassembly_handoff_trace_t *t =
1214 va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1217 format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1218 t->next_worker_index);
1224 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1225 vlib_node_runtime_t * node,
1226 vlib_frame_t * frame, bool is_feature)
1228 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1230 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1231 u32 n_enq, n_left_from, *from;
1232 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1235 from = vlib_frame_vector_args (frame);
1236 n_left_from = frame->n_vectors;
1237 vlib_get_buffers (vm, from, bufs, n_left_from);
1240 ti = thread_indices;
1242 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1244 while (n_left_from > 0)
1246 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1249 ((node->flags & VLIB_NODE_FLAG_TRACE)
1250 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1252 ip6_sv_reassembly_handoff_trace_t *t =
1253 vlib_add_trace (vm, node, b[0], sizeof (*t));
1254 t->next_worker_index = ti[0];
1261 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1262 thread_indices, frame->n_vectors, 1);
1264 if (n_enq < frame->n_vectors)
1265 vlib_node_increment_counter (vm, node->node_index,
1266 IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1267 frame->n_vectors - n_enq);
1268 return frame->n_vectors;
1271 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1272 vlib_node_runtime_t * node,
1273 vlib_frame_t * frame)
1275 return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1276 false /* is_feature */ );
1280 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1281 .name = "ip6-sv-reassembly-handoff",
1282 .vector_size = sizeof (u32),
1283 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1284 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1285 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1295 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1296 vlib_node_runtime_t * node, vlib_frame_t * frame)
1298 return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1303 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1304 .name = "ip6-sv-reass-feature-hoff",
1305 .vector_size = sizeof (u32),
1306 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1307 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1308 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1318 #ifndef CLIB_MARCH_VARIANT
1320 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1322 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1323 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1326 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1328 ++rm->feature_use_refcount_per_intf[sw_if_index];
1329 return vnet_feature_enable_disable ("ip6-unicast",
1330 "ip6-sv-reassembly-feature",
1331 sw_if_index, 1, 0, 0);
1333 ++rm->feature_use_refcount_per_intf[sw_if_index];
1337 --rm->feature_use_refcount_per_intf[sw_if_index];
1338 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1339 return vnet_feature_enable_disable ("ip6-unicast",
1340 "ip6-sv-reassembly-feature",
1341 sw_if_index, 0, 0, 0);
1348 * fd.io coding-style-patch-verification: ON
1351 * eval: (c-set-style "gnu")