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 (rm->vlib_main);
308 if (!clib_bihash_search_48_8
309 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
311 if (vm->thread_index != kv->v.thread_index)
316 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
318 if (now > reass->last_heard + rm->timeout)
320 ip6_sv_reass_free (vm, rm, rt, reass);
327 reass->last_heard = now;
331 if (rt->reass_n >= rm->max_reass_n)
333 reass = pool_elt_at_index (rt->pool, rt->lru_last);
334 ip6_sv_reass_free (vm, rm, rt, reass);
337 pool_get (rt->pool, reass);
338 clib_memset (reass, 0, sizeof (*reass));
339 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
341 ip6_sv_reass_init (reass);
344 reass->lru_prev = reass->lru_next = ~0;
346 if (~0 != rt->lru_last)
348 ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
349 reass->lru_prev = rt->lru_last;
350 lru_last->lru_next = rt->lru_last = reass - rt->pool;
353 if (~0 == rt->lru_first)
355 rt->lru_first = rt->lru_last = reass - rt->pool;
358 reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
359 reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
360 reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
361 reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
362 reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
363 reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
364 kv->v.reass_index = (reass - rt->pool);
365 kv->v.thread_index = vm->thread_index;
366 reass->last_heard = now;
368 if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 1))
370 ip6_sv_reass_free (vm, rm, rt, reass);
377 always_inline ip6_sv_reass_rc_t
378 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
379 ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
380 ip6_sv_reass_t * reass, u32 bi0,
381 ip6_frag_hdr_t * frag_hdr)
383 vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
384 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
385 fvnb->ip.reass.ip6_frag_hdr_offset =
386 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
387 ip6_header_t *fip = vlib_buffer_get_current (fb);
388 if (fb->current_length < sizeof (*fip) ||
389 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
390 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
392 return IP6_SV_REASS_RC_INTERNAL_ERROR;
395 u32 fragment_first = fvnb->ip.reass.fragment_first =
396 ip6_frag_hdr_offset_bytes (frag_hdr);
397 u32 fragment_length =
398 vlib_buffer_length_in_chain (vm, fb) -
399 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
400 u32 fragment_last = fvnb->ip.reass.fragment_last =
401 fragment_first + fragment_length - 1;
402 fvnb->ip.reass.range_first = fragment_first;
403 fvnb->ip.reass.range_last = fragment_last;
404 fvnb->ip.reass.next_range_bi = ~0;
405 if (0 == fragment_first)
408 (vm, fb, fip, fb->current_length, &reass->ip_proto,
409 &reass->l4_src_port, &reass->l4_dst_port,
410 &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
411 &reass->tcp_seq_number))
412 return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
414 reass->is_complete = true;
415 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
416 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
418 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
419 reass->ip_proto, reass->l4_src_port,
423 vec_add1 (reass->cached_buffers, bi0);
424 if (!reass->is_complete)
426 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
428 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
429 REASS_FRAGMENT_CACHE, reass->ip_proto,
430 reass->l4_src_port, reass->l4_dst_port);
432 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
434 return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
437 return IP6_SV_REASS_RC_OK;
441 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
443 ip6_frag_hdr_t * frag_hdr)
445 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
446 while (ip6_ext_hdr (tmp->next_hdr))
448 tmp = ip6_ext_next_header (tmp);
450 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
452 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
453 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
455 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
463 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
464 vlib_node_runtime_t * node,
466 ip6_frag_hdr_t * frag_hdr)
468 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
469 ip6_header_t *ip = vlib_buffer_get_current (b);
470 int more_fragments = ip6_frag_hdr_more (frag_hdr);
471 u32 fragment_length =
472 vlib_buffer_length_in_chain (vm, b) -
473 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
474 if (more_fragments && 0 != fragment_length % 8)
476 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
477 ICMP6_parameter_problem_erroneous_header_field,
478 (u8 *) & ip->payload_length - (u8 *) ip);
485 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
486 vlib_node_runtime_t * node,
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;
534 b0 = vlib_get_buffer (vm, bi0);
536 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
537 ip6_frag_hdr_t *frag_hdr = NULL;
538 ip6_ext_header_t *prev_hdr;
539 if (ip6_ext_hdr (ip0->protocol))
542 ip6_ext_header_find (vm, b0, ip0,
543 IP_PROTOCOL_IPV6_FRAGMENTATION,
548 // this is a regular packet - no fragmentation
550 (vm, b0, ip0, b0->current_length,
551 &(vnet_buffer (b0)->ip.reass.ip_proto),
552 &(vnet_buffer (b0)->ip.reass.l4_src_port),
553 &(vnet_buffer (b0)->ip.reass.l4_dst_port),
554 &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
555 &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
556 &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
558 error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
559 b0->error = node->errors[error0];
560 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
563 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
564 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
565 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
567 ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
569 vnet_buffer (b0)->ip.reass.ip_proto,
570 vnet_buffer (b0)->ip.
572 vnet_buffer (b0)->ip.
577 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
578 (u8 *) frag_hdr - (u8 *) ip0;
579 if (0 == ip6_frag_hdr_offset (frag_hdr))
581 // first fragment - verify upper-layer is present
582 if (!ip6_sv_reass_verify_upper_layer_present
583 (node, b0, frag_hdr))
585 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
589 if (!ip6_sv_reass_verify_fragment_multiple_8
590 (vm, node, b0, frag_hdr)
591 || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
594 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
598 ip6_sv_reass_kv_t kv;
601 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
602 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
603 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
604 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
606 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
607 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
608 (u64) frag_hdr->identification;
609 kv.k.as_u64[5] = ip0->protocol;
611 ip6_sv_reass_t *reass =
612 ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
615 if (PREDICT_FALSE (do_handoff))
617 next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
618 vnet_buffer (b0)->ip.reass.owner_thread_index =
625 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
626 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
627 b0->error = node->errors[error0];
631 if (reass->is_complete)
633 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
634 ! !ip6_frag_hdr_offset (frag_hdr);
635 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
636 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
637 reass->icmp_type_or_tcp_flags;
638 vnet_buffer (b0)->ip.reass.tcp_ack_number =
639 reass->tcp_ack_number;
640 vnet_buffer (b0)->ip.reass.tcp_seq_number =
641 reass->tcp_seq_number;
642 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
643 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
644 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
645 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
647 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
648 REASS_FRAGMENT_FORWARD,
656 switch (ip6_sv_reass_update
657 (vm, node, rm, rt, reass, bi0, frag_hdr))
659 case IP6_SV_REASS_RC_OK:
660 /* nothing to do here */
662 case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
663 vlib_node_increment_counter (vm, node->node_index,
664 IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
666 ip6_sv_reass_free (vm, rm, rt, reass);
669 case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
670 vlib_node_increment_counter (vm, node->node_index,
671 IP6_ERROR_REASS_UNSUPP_IP_PROTO,
673 ip6_sv_reass_free (vm, rm, rt, reass);
676 case IP6_SV_REASS_RC_INTERNAL_ERROR:
677 vlib_node_increment_counter (vm, node->node_index,
678 IP6_ERROR_REASS_INTERNAL_ERROR, 1);
679 ip6_sv_reass_free (vm, rm, rt, reass);
684 if (reass->is_complete)
687 vec_foreach_index (idx, reass->cached_buffers)
689 u32 bi0 = vec_elt (reass->cached_buffers, idx);
690 if (0 == n_left_to_next)
692 vlib_put_next_frame (vm, node, next_index,
694 vlib_get_next_frame (vm, node, next_index, to_next,
700 b0 = vlib_get_buffer (vm, bi0);
703 vnet_feature_next (&next0, b0);
706 vlib_buffer_get_current (b0) +
707 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
708 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
709 ! !ip6_frag_hdr_offset (frag_hdr);
710 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
711 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
712 reass->icmp_type_or_tcp_flags;
713 vnet_buffer (b0)->ip.reass.tcp_ack_number =
714 reass->tcp_ack_number;
715 vnet_buffer (b0)->ip.reass.tcp_seq_number =
716 reass->tcp_seq_number;
717 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
718 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
719 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
721 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
722 REASS_FRAGMENT_FORWARD,
727 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
728 to_next, n_left_to_next, bi0,
731 _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
739 if (is_feature && IP6_ERROR_NONE == error0)
741 b0 = vlib_get_buffer (vm, bi0);
742 vnet_feature_next (&next0, b0);
744 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
745 n_left_to_next, bi0, next0);
749 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
750 to_next[0] = icmp_bi;
753 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
754 n_left_to_next, icmp_bi,
763 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
766 clib_spinlock_unlock (&rt->lock);
767 return frame->n_vectors;
770 static char *ip6_sv_reassembly_error_strings[] = {
771 #define _(sym, string) string,
776 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
777 vlib_node_runtime_t * node,
778 vlib_frame_t * frame)
780 return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
784 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
785 .name = "ip6-sv-reassembly",
786 .vector_size = sizeof (u32),
787 .format_trace = format_ip6_sv_reass_trace,
788 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
789 .error_strings = ip6_sv_reassembly_error_strings,
790 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
793 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
794 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
795 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
796 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
801 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
802 vlib_node_runtime_t * node,
803 vlib_frame_t * frame)
805 return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
809 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
810 .name = "ip6-sv-reassembly-feature",
811 .vector_size = sizeof (u32),
812 .format_trace = format_ip6_sv_reass_trace,
813 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
814 .error_strings = ip6_sv_reassembly_error_strings,
815 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
818 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
819 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
820 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
821 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
827 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
828 .arc_name = "ip6-unicast",
829 .node_name = "ip6-sv-reassembly-feature",
830 .runs_before = VNET_FEATURES ("ip6-lookup"),
835 #ifndef CLIB_MARCH_VARIANT
837 ip6_sv_reass_get_nbuckets ()
839 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
843 nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
845 for (i = 0; i < 31; i++)
846 if ((1 << i) >= nbuckets)
852 #endif /* CLIB_MARCH_VARIANT */
856 IP6_EVENT_CONFIG_CHANGED = 1,
857 } ip6_sv_reass_event_t;
859 #ifndef CLIB_MARCH_VARIANT
863 clib_bihash_48_8_t *new_hash;
867 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
869 ip6_rehash_cb_ctx *ctx = _ctx;
870 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
874 return (BIHASH_WALK_CONTINUE);
878 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
879 u32 max_reassembly_length,
880 u32 expire_walk_interval_ms)
882 ip6_sv_reass_main.timeout_ms = timeout_ms;
883 ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
884 ip6_sv_reass_main.max_reass_n = max_reassemblies;
885 ip6_sv_reass_main.max_reass_len = max_reassembly_length;
886 ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
890 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
891 u32 max_reassembly_length, u32 expire_walk_interval_ms)
893 u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
894 ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
895 max_reassembly_length, expire_walk_interval_ms);
896 vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
897 ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
898 IP6_EVENT_CONFIG_CHANGED, 0);
899 u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
900 if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
902 clib_bihash_48_8_t new_hash;
903 clib_memset (&new_hash, 0, sizeof (new_hash));
904 ip6_rehash_cb_ctx ctx;
906 ctx.new_hash = &new_hash;
907 clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
908 new_nbuckets * 1024);
909 clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
910 ip6_rehash_cb, &ctx);
913 clib_bihash_free_48_8 (&new_hash);
918 clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
919 clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
920 sizeof (ip6_sv_reass_main.hash));
921 clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
928 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
929 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
931 *timeout_ms = ip6_sv_reass_main.timeout_ms;
932 *max_reassemblies = ip6_sv_reass_main.max_reass_n;
933 *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
934 *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
938 static clib_error_t *
939 ip6_sv_reass_init_function (vlib_main_t * vm)
941 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
942 clib_error_t *error = 0;
947 rm->vnet_main = vnet_get_main ();
949 vec_validate (rm->per_thread_data, vlib_num_workers ());
950 ip6_sv_reass_per_thread_t *rt;
951 vec_foreach (rt, rm->per_thread_data)
953 clib_spinlock_init (&rt->lock);
954 pool_alloc (rt->pool, rm->max_reass_n);
955 rt->lru_first = rt->lru_last = ~0;
958 node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
960 rm->ip6_sv_reass_expire_node_idx = node->index;
962 ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
963 IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
964 IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
965 IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
967 nbuckets = ip6_sv_reass_get_nbuckets ();
968 clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
971 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
973 rm->ip6_drop_idx = node->index;
974 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
976 rm->ip6_icmp_error_idx = node->index;
978 if ((error = vlib_call_init_function (vm, ip_main_init)))
980 ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
981 ip6_sv_reass_node.index);
983 rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
984 rm->fq_feature_index =
985 vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
987 rm->feature_use_refcount_per_intf = NULL;
992 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
993 #endif /* CLIB_MARCH_VARIANT */
996 ip6_sv_reass_walk_expired (vlib_main_t * vm,
997 vlib_node_runtime_t * node, vlib_frame_t * f)
999 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1000 uword event_type, *event_data = 0;
1004 vlib_process_wait_for_event_or_clock (vm,
1005 (f64) rm->expire_walk_interval_ms
1006 / (f64) MSEC_PER_SEC);
1007 event_type = vlib_process_get_events (vm, &event_data);
1011 case ~0: /* no events => timeout */
1012 /* nothing to do here */
1014 case IP6_EVENT_CONFIG_CHANGED:
1017 clib_warning ("BUG: event type 0x%wx", event_type);
1020 f64 now = vlib_time_now (vm);
1022 ip6_sv_reass_t *reass;
1023 int *pool_indexes_to_free = NULL;
1025 uword thread_index = 0;
1027 const uword nthreads = vlib_num_workers () + 1;
1028 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1030 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1031 clib_spinlock_lock (&rt->lock);
1033 vec_reset_length (pool_indexes_to_free);
1035 pool_foreach_index (index, rt->pool, ({
1036 reass = pool_elt_at_index (rt->pool, index);
1037 if (now > reass->last_heard + rm->timeout)
1039 vec_add1 (pool_indexes_to_free, index);
1045 vec_foreach (i, pool_indexes_to_free)
1047 ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1048 ip6_sv_reass_free (vm, rm, rt, reass);
1052 clib_spinlock_unlock (&rt->lock);
1055 vec_free (pool_indexes_to_free);
1058 _vec_len (event_data) = 0;
1066 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1067 .function = ip6_sv_reass_walk_expired,
1068 .format_trace = format_ip6_sv_reass_trace,
1069 .type = VLIB_NODE_TYPE_PROCESS,
1070 .name = "ip6-sv-reassembly-expire-walk",
1072 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1073 .error_strings = ip6_sv_reassembly_error_strings,
1079 format_ip6_sv_reass_key (u8 * s, va_list * args)
1081 ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1082 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1083 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1084 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1089 format_ip6_sv_reass (u8 * s, va_list * args)
1091 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1092 ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1094 s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1095 reass->id, format_ip6_sv_reass_key, &reass->key,
1096 reass->trace_op_counter);
1100 vec_foreach (bip, reass->cached_buffers)
1105 b = vlib_get_buffer (vm, bi);
1106 s = format (s, " #%03u: bi: %u\n", counter, bi);
1108 bi = b->next_buffer;
1110 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1115 static clib_error_t *
1116 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1117 CLIB_UNUSED (vlib_cli_command_t * lmd))
1119 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1121 vlib_cli_output (vm, "---------------------");
1122 vlib_cli_output (vm, "IP6 reassembly status");
1123 vlib_cli_output (vm, "---------------------");
1124 bool details = false;
1125 if (unformat (input, "details"))
1130 u32 sum_reass_n = 0;
1131 u64 sum_buffers_n = 0;
1132 ip6_sv_reass_t *reass;
1134 const uword nthreads = vlib_num_workers () + 1;
1135 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1137 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1138 clib_spinlock_lock (&rt->lock);
1142 pool_foreach (reass, rt->pool, {
1143 vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1147 sum_reass_n += rt->reass_n;
1148 clib_spinlock_unlock (&rt->lock);
1150 vlib_cli_output (vm, "---------------------");
1151 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1152 (long unsigned) sum_reass_n);
1153 vlib_cli_output (vm,
1154 "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1155 (long unsigned) rm->max_reass_n);
1156 vlib_cli_output (vm,
1157 "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1158 (long unsigned) rm->timeout_ms);
1159 vlib_cli_output (vm,
1160 "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1161 (long unsigned) rm->expire_walk_interval_ms);
1162 vlib_cli_output (vm, "Buffers in use: %lu\n",
1163 (long unsigned) sum_buffers_n);
1168 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1169 .path = "show ip6-sv-reassembly",
1170 .short_help = "show ip6-sv-reassembly [details]",
1171 .function = show_ip6_sv_reass,
1175 #ifndef CLIB_MARCH_VARIANT
1177 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1179 return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1182 #endif /* CLIB_MARCH_VARIANT */
1184 #define foreach_ip6_sv_reassembly_handoff_error \
1185 _(CONGESTION_DROP, "congestion drop")
1190 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1191 foreach_ip6_sv_reassembly_handoff_error
1193 IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1194 } ip6_sv_reassembly_handoff_error_t;
1196 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1197 #define _(sym,string) string,
1198 foreach_ip6_sv_reassembly_handoff_error
1204 u32 next_worker_index;
1205 } ip6_sv_reassembly_handoff_trace_t;
1208 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1210 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1211 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1212 ip6_sv_reassembly_handoff_trace_t *t =
1213 va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1216 format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1217 t->next_worker_index);
1223 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1224 vlib_node_runtime_t * node,
1225 vlib_frame_t * frame, bool is_feature)
1227 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1229 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1230 u32 n_enq, n_left_from, *from;
1231 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1234 from = vlib_frame_vector_args (frame);
1235 n_left_from = frame->n_vectors;
1236 vlib_get_buffers (vm, from, bufs, n_left_from);
1239 ti = thread_indices;
1241 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1243 while (n_left_from > 0)
1245 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1248 ((node->flags & VLIB_NODE_FLAG_TRACE)
1249 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1251 ip6_sv_reassembly_handoff_trace_t *t =
1252 vlib_add_trace (vm, node, b[0], sizeof (*t));
1253 t->next_worker_index = ti[0];
1261 vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1262 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")