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 if (pool_is_free_index
232 (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
234 // this buffer's trace is gone
235 b->flags &= ~VLIB_BUFFER_IS_TRACED;
238 ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
241 t->reass_id = reass->id;
242 t->op_id = reass->trace_op_counter;
243 ++reass->trace_op_counter;
246 t->ip_proto = ip_proto;
247 t->l4_src_port = l4_src_port;
248 t->l4_dst_port = l4_dst_port;
251 s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
252 printf ("%.*s\n", vec_len (s), s);
254 vec_reset_length (s);
259 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
260 ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
262 clib_bihash_kv_48_8_t kv;
263 kv.key[0] = reass->key.as_u64[0];
264 kv.key[1] = reass->key.as_u64[1];
265 kv.key[2] = reass->key.as_u64[2];
266 kv.key[3] = reass->key.as_u64[3];
267 kv.key[4] = reass->key.as_u64[4];
268 kv.key[5] = reass->key.as_u64[5];
269 clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
270 vlib_buffer_free (vm, reass->cached_buffers,
271 vec_len (reass->cached_buffers));
272 vec_free (reass->cached_buffers);
273 reass->cached_buffers = NULL;
274 if (~0 != reass->lru_prev)
276 ip6_sv_reass_t *lru_prev =
277 pool_elt_at_index (rt->pool, reass->lru_prev);
278 lru_prev->lru_next = reass->lru_next;
280 if (~0 != reass->lru_next)
282 ip6_sv_reass_t *lru_next =
283 pool_elt_at_index (rt->pool, reass->lru_next);
284 lru_next->lru_prev = reass->lru_prev;
286 if (rt->lru_first == reass - rt->pool)
288 rt->lru_first = reass->lru_next;
290 if (rt->lru_last == reass - rt->pool)
292 rt->lru_last = reass->lru_prev;
294 pool_put (rt->pool, reass);
299 ip6_sv_reass_init (ip6_sv_reass_t * reass)
301 reass->cached_buffers = NULL;
302 reass->is_complete = false;
305 always_inline ip6_sv_reass_t *
306 ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
307 ip6_sv_reass_main_t * rm,
308 ip6_sv_reass_per_thread_t * rt,
309 ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
312 ip6_sv_reass_t *reass = NULL;
313 f64 now = vlib_time_now (vm);
315 if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
317 if (vm->thread_index != kv->v.thread_index)
322 reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
324 if (now > reass->last_heard + rm->timeout)
326 ip6_sv_reass_free (vm, rm, rt, reass);
333 reass->last_heard = now;
337 if (rt->reass_n >= rm->max_reass_n)
339 reass = pool_elt_at_index (rt->pool, rt->lru_first);
340 ip6_sv_reass_free (vm, rm, rt, reass);
343 pool_get (rt->pool, reass);
344 clib_memset (reass, 0, sizeof (*reass));
345 reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
347 ip6_sv_reass_init (reass);
350 reass->lru_prev = reass->lru_next = ~0;
352 if (~0 != rt->lru_last)
354 ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
355 reass->lru_prev = rt->lru_last;
356 lru_last->lru_next = rt->lru_last = reass - rt->pool;
359 if (~0 == rt->lru_first)
361 rt->lru_first = rt->lru_last = reass - rt->pool;
364 reass->key.as_u64[0] = kv->kv.key[0];
365 reass->key.as_u64[1] = kv->kv.key[1];
366 reass->key.as_u64[2] = kv->kv.key[2];
367 reass->key.as_u64[3] = kv->kv.key[3];
368 reass->key.as_u64[4] = kv->kv.key[4];
369 reass->key.as_u64[5] = kv->kv.key[5];
370 kv->v.reass_index = (reass - rt->pool);
371 kv->v.thread_index = vm->thread_index;
372 reass->last_heard = now;
374 if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
376 ip6_sv_reass_free (vm, rm, rt, reass);
383 always_inline ip6_sv_reass_rc_t
384 ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
385 ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
386 ip6_sv_reass_t * reass, u32 bi0,
387 ip6_frag_hdr_t * frag_hdr)
389 vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
390 vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
391 fvnb->ip.reass.ip6_frag_hdr_offset =
392 (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
393 ip6_header_t *fip = vlib_buffer_get_current (fb);
394 if (fb->current_length < sizeof (*fip) ||
395 fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
396 fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
398 return IP6_SV_REASS_RC_INTERNAL_ERROR;
401 u32 fragment_first = fvnb->ip.reass.fragment_first =
402 ip6_frag_hdr_offset_bytes (frag_hdr);
403 u32 fragment_length =
404 vlib_buffer_length_in_chain (vm, fb) -
405 (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
406 u32 fragment_last = fvnb->ip.reass.fragment_last =
407 fragment_first + fragment_length - 1;
408 fvnb->ip.reass.range_first = fragment_first;
409 fvnb->ip.reass.range_last = fragment_last;
410 fvnb->ip.reass.next_range_bi = ~0;
411 if (0 == fragment_first)
414 (vm, fb, fip, fb->current_length, &reass->ip_proto,
415 &reass->l4_src_port, &reass->l4_dst_port,
416 &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
417 &reass->tcp_seq_number))
418 return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
420 reass->is_complete = true;
421 vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
422 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
424 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
425 reass->ip_proto, reass->l4_src_port,
429 vec_add1 (reass->cached_buffers, bi0);
430 if (!reass->is_complete)
432 if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
434 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
435 REASS_FRAGMENT_CACHE, reass->ip_proto,
436 reass->l4_src_port, reass->l4_dst_port);
438 if (vec_len (reass->cached_buffers) > rm->max_reass_len)
440 return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
443 return IP6_SV_REASS_RC_OK;
447 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
449 ip6_frag_hdr_t * frag_hdr)
451 ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
452 while (ip6_ext_hdr (tmp->next_hdr))
454 tmp = ip6_ext_next_header (tmp);
456 if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
458 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
459 ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
461 b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
469 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
470 vlib_node_runtime_t * node,
472 ip6_frag_hdr_t * frag_hdr)
474 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
475 ip6_header_t *ip = vlib_buffer_get_current (b);
476 int more_fragments = ip6_frag_hdr_more (frag_hdr);
477 u32 fragment_length =
478 vlib_buffer_length_in_chain (vm, b) -
479 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
480 if (more_fragments && 0 != fragment_length % 8)
482 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
483 ICMP6_parameter_problem_erroneous_header_field,
484 (u8 *) & ip->payload_length - (u8 *) ip);
491 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
492 vlib_node_runtime_t * node,
494 ip6_frag_hdr_t * frag_hdr)
496 vnet_buffer_opaque_t *vnb = vnet_buffer (b);
497 u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
498 u32 fragment_length =
499 vlib_buffer_length_in_chain (vm, b) -
500 (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
501 if (fragment_first + fragment_length > 65535)
503 ip6_header_t *ip0 = vlib_buffer_get_current (b);
504 icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
505 ICMP6_parameter_problem_erroneous_header_field,
506 (u8 *) & frag_hdr->fragment_offset_and_more
514 ip6_sv_reassembly_inline (vlib_main_t * vm,
515 vlib_node_runtime_t * node,
516 vlib_frame_t * frame, bool is_feature)
518 u32 *from = vlib_frame_vector_args (frame);
519 u32 n_left_from, n_left_to_next, *to_next, next_index;
520 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
521 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
522 clib_spinlock_lock (&rt->lock);
524 n_left_from = frame->n_vectors;
525 next_index = node->cached_next_index;
527 while (n_left_from > 0)
529 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
531 while (n_left_from > 0 && n_left_to_next > 0)
535 u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
536 u32 error0 = IP6_ERROR_NONE;
540 b0 = vlib_get_buffer (vm, bi0);
542 ip6_header_t *ip0 = vlib_buffer_get_current (b0);
543 ip6_frag_hdr_t *frag_hdr = NULL;
544 ip6_ext_header_t *prev_hdr;
545 if (ip6_ext_hdr (ip0->protocol))
548 ip6_ext_header_find (vm, b0, ip0,
549 IP_PROTOCOL_IPV6_FRAGMENTATION,
554 // this is a regular packet - no fragmentation
556 (vm, b0, ip0, b0->current_length,
557 &(vnet_buffer (b0)->ip.reass.ip_proto),
558 &(vnet_buffer (b0)->ip.reass.l4_src_port),
559 &(vnet_buffer (b0)->ip.reass.l4_dst_port),
560 &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
561 &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
562 &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
564 error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
565 b0->error = node->errors[error0];
566 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
569 vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
570 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
571 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
573 ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
575 vnet_buffer (b0)->ip.reass.ip_proto,
576 vnet_buffer (b0)->ip.
578 vnet_buffer (b0)->ip.
583 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
584 (u8 *) frag_hdr - (u8 *) ip0;
585 if (0 == ip6_frag_hdr_offset (frag_hdr))
587 // first fragment - verify upper-layer is present
588 if (!ip6_sv_reass_verify_upper_layer_present
589 (node, b0, frag_hdr))
591 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
595 if (!ip6_sv_reass_verify_fragment_multiple_8
596 (vm, node, b0, frag_hdr)
597 || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
600 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
604 ip6_sv_reass_kv_t kv;
607 kv.k.as_u64[0] = ip0->src_address.as_u64[0];
608 kv.k.as_u64[1] = ip0->src_address.as_u64[1];
609 kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
610 kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
612 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
613 vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
614 (u64) frag_hdr->identification;
615 kv.k.as_u64[5] = ip0->protocol;
617 ip6_sv_reass_t *reass =
618 ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
621 if (PREDICT_FALSE (do_handoff))
623 next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
624 vnet_buffer (b0)->ip.reass.owner_thread_index =
631 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
632 error0 = IP6_ERROR_REASS_LIMIT_REACHED;
633 b0->error = node->errors[error0];
637 if (reass->is_complete)
639 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
640 ! !ip6_frag_hdr_offset (frag_hdr);
641 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
642 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
643 reass->icmp_type_or_tcp_flags;
644 vnet_buffer (b0)->ip.reass.tcp_ack_number =
645 reass->tcp_ack_number;
646 vnet_buffer (b0)->ip.reass.tcp_seq_number =
647 reass->tcp_seq_number;
648 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
649 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
650 next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
651 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
653 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
654 REASS_FRAGMENT_FORWARD,
662 switch (ip6_sv_reass_update
663 (vm, node, rm, rt, reass, bi0, frag_hdr))
665 case IP6_SV_REASS_RC_OK:
666 /* nothing to do here */
668 case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
669 vlib_node_increment_counter (vm, node->node_index,
670 IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
672 ip6_sv_reass_free (vm, rm, rt, reass);
675 case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
676 vlib_node_increment_counter (vm, node->node_index,
677 IP6_ERROR_REASS_UNSUPP_IP_PROTO,
679 ip6_sv_reass_free (vm, rm, rt, reass);
682 case IP6_SV_REASS_RC_INTERNAL_ERROR:
683 vlib_node_increment_counter (vm, node->node_index,
684 IP6_ERROR_REASS_INTERNAL_ERROR, 1);
685 ip6_sv_reass_free (vm, rm, rt, reass);
690 if (reass->is_complete)
693 vec_foreach_index (idx, reass->cached_buffers)
695 u32 bi0 = vec_elt (reass->cached_buffers, idx);
696 if (0 == n_left_to_next)
698 vlib_put_next_frame (vm, node, next_index,
700 vlib_get_next_frame (vm, node, next_index, to_next,
706 b0 = vlib_get_buffer (vm, bi0);
709 vnet_feature_next (&next0, b0);
712 vlib_buffer_get_current (b0) +
713 vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
714 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
715 ! !ip6_frag_hdr_offset (frag_hdr);
716 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
717 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
718 reass->icmp_type_or_tcp_flags;
719 vnet_buffer (b0)->ip.reass.tcp_ack_number =
720 reass->tcp_ack_number;
721 vnet_buffer (b0)->ip.reass.tcp_seq_number =
722 reass->tcp_seq_number;
723 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
724 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
725 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
727 ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
728 REASS_FRAGMENT_FORWARD,
733 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
734 to_next, n_left_to_next, bi0,
737 _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
745 if (is_feature && IP6_ERROR_NONE == error0)
747 b0 = vlib_get_buffer (vm, bi0);
748 vnet_feature_next (&next0, b0);
750 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
751 n_left_to_next, bi0, next0);
755 next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
756 to_next[0] = icmp_bi;
759 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
760 n_left_to_next, icmp_bi,
769 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
772 clib_spinlock_unlock (&rt->lock);
773 return frame->n_vectors;
776 static char *ip6_sv_reassembly_error_strings[] = {
777 #define _(sym, string) string,
782 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
783 vlib_node_runtime_t * node,
784 vlib_frame_t * frame)
786 return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
790 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
791 .name = "ip6-sv-reassembly",
792 .vector_size = sizeof (u32),
793 .format_trace = format_ip6_sv_reass_trace,
794 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
795 .error_strings = ip6_sv_reassembly_error_strings,
796 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
799 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
800 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
801 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
802 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
807 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
808 vlib_node_runtime_t * node,
809 vlib_frame_t * frame)
811 return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
815 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
816 .name = "ip6-sv-reassembly-feature",
817 .vector_size = sizeof (u32),
818 .format_trace = format_ip6_sv_reass_trace,
819 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
820 .error_strings = ip6_sv_reassembly_error_strings,
821 .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
824 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
825 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
826 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
827 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
833 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
834 .arc_name = "ip6-unicast",
835 .node_name = "ip6-sv-reassembly-feature",
836 .runs_before = VNET_FEATURES ("ip6-lookup"),
841 #ifndef CLIB_MARCH_VARIANT
843 ip6_sv_reass_get_nbuckets ()
845 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
849 nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
851 for (i = 0; i < 31; i++)
852 if ((1 << i) >= nbuckets)
858 #endif /* CLIB_MARCH_VARIANT */
862 IP6_EVENT_CONFIG_CHANGED = 1,
863 } ip6_sv_reass_event_t;
865 #ifndef CLIB_MARCH_VARIANT
869 clib_bihash_48_8_t *new_hash;
873 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
875 ip6_rehash_cb_ctx *ctx = _ctx;
876 if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
880 return (BIHASH_WALK_CONTINUE);
884 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
885 u32 max_reassembly_length,
886 u32 expire_walk_interval_ms)
888 ip6_sv_reass_main.timeout_ms = timeout_ms;
889 ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
890 ip6_sv_reass_main.max_reass_n = max_reassemblies;
891 ip6_sv_reass_main.max_reass_len = max_reassembly_length;
892 ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
896 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
897 u32 max_reassembly_length, u32 expire_walk_interval_ms)
899 u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
900 ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
901 max_reassembly_length, expire_walk_interval_ms);
902 vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
903 ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
904 IP6_EVENT_CONFIG_CHANGED, 0);
905 u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
906 if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
908 clib_bihash_48_8_t new_hash;
909 clib_memset (&new_hash, 0, sizeof (new_hash));
910 ip6_rehash_cb_ctx ctx;
912 ctx.new_hash = &new_hash;
913 clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
914 new_nbuckets * 1024);
915 clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
916 ip6_rehash_cb, &ctx);
919 clib_bihash_free_48_8 (&new_hash);
924 clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
925 clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
926 sizeof (ip6_sv_reass_main.hash));
927 clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
934 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
935 u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
937 *timeout_ms = ip6_sv_reass_main.timeout_ms;
938 *max_reassemblies = ip6_sv_reass_main.max_reass_n;
939 *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
940 *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
944 static clib_error_t *
945 ip6_sv_reass_init_function (vlib_main_t * vm)
947 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
948 clib_error_t *error = 0;
953 rm->vnet_main = vnet_get_main ();
955 vec_validate (rm->per_thread_data, vlib_num_workers ());
956 ip6_sv_reass_per_thread_t *rt;
957 vec_foreach (rt, rm->per_thread_data)
959 clib_spinlock_init (&rt->lock);
960 pool_alloc (rt->pool, rm->max_reass_n);
961 rt->lru_first = rt->lru_last = ~0;
964 node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
966 rm->ip6_sv_reass_expire_node_idx = node->index;
968 ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
969 IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
970 IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
971 IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
973 nbuckets = ip6_sv_reass_get_nbuckets ();
974 clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
977 node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
979 rm->ip6_drop_idx = node->index;
980 node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
982 rm->ip6_icmp_error_idx = node->index;
984 if ((error = vlib_call_init_function (vm, ip_main_init)))
987 rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
988 rm->fq_feature_index =
989 vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
991 rm->feature_use_refcount_per_intf = NULL;
996 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
997 #endif /* CLIB_MARCH_VARIANT */
1000 ip6_sv_reass_walk_expired (vlib_main_t * vm,
1001 vlib_node_runtime_t * node, vlib_frame_t * f)
1003 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1004 uword event_type, *event_data = 0;
1008 vlib_process_wait_for_event_or_clock (vm,
1009 (f64) rm->expire_walk_interval_ms
1010 / (f64) MSEC_PER_SEC);
1011 event_type = vlib_process_get_events (vm, &event_data);
1015 case ~0: /* no events => timeout */
1016 /* nothing to do here */
1018 case IP6_EVENT_CONFIG_CHANGED:
1021 clib_warning ("BUG: event type 0x%wx", event_type);
1024 f64 now = vlib_time_now (vm);
1026 ip6_sv_reass_t *reass;
1027 int *pool_indexes_to_free = NULL;
1029 uword thread_index = 0;
1031 const uword nthreads = vlib_num_workers () + 1;
1032 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1034 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1035 clib_spinlock_lock (&rt->lock);
1037 vec_reset_length (pool_indexes_to_free);
1039 pool_foreach_index (index, rt->pool) {
1040 reass = pool_elt_at_index (rt->pool, index);
1041 if (now > reass->last_heard + rm->timeout)
1043 vec_add1 (pool_indexes_to_free, index);
1049 vec_foreach (i, pool_indexes_to_free)
1051 ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1052 ip6_sv_reass_free (vm, rm, rt, reass);
1056 clib_spinlock_unlock (&rt->lock);
1059 vec_free (pool_indexes_to_free);
1062 _vec_len (event_data) = 0;
1070 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1071 .function = ip6_sv_reass_walk_expired,
1072 .format_trace = format_ip6_sv_reass_trace,
1073 .type = VLIB_NODE_TYPE_PROCESS,
1074 .name = "ip6-sv-reassembly-expire-walk",
1076 .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1077 .error_strings = ip6_sv_reassembly_error_strings,
1083 format_ip6_sv_reass_key (u8 * s, va_list * args)
1085 ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1086 s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1087 key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1088 &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1093 format_ip6_sv_reass (u8 * s, va_list * args)
1095 vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1096 ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1098 s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1099 reass->id, format_ip6_sv_reass_key, &reass->key,
1100 reass->trace_op_counter);
1104 vec_foreach (bip, reass->cached_buffers)
1109 b = vlib_get_buffer (vm, bi);
1110 s = format (s, " #%03u: bi: %u\n", counter, bi);
1112 bi = b->next_buffer;
1114 while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1119 static clib_error_t *
1120 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1121 CLIB_UNUSED (vlib_cli_command_t * lmd))
1123 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1125 vlib_cli_output (vm, "---------------------");
1126 vlib_cli_output (vm, "IP6 reassembly status");
1127 vlib_cli_output (vm, "---------------------");
1128 bool details = false;
1129 if (unformat (input, "details"))
1134 u32 sum_reass_n = 0;
1135 u64 sum_buffers_n = 0;
1136 ip6_sv_reass_t *reass;
1138 const uword nthreads = vlib_num_workers () + 1;
1139 for (thread_index = 0; thread_index < nthreads; ++thread_index)
1141 ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1142 clib_spinlock_lock (&rt->lock);
1146 pool_foreach (reass, rt->pool) {
1147 vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1151 sum_reass_n += rt->reass_n;
1152 clib_spinlock_unlock (&rt->lock);
1154 vlib_cli_output (vm, "---------------------");
1155 vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1156 (long unsigned) sum_reass_n);
1157 vlib_cli_output (vm,
1158 "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1159 (long unsigned) rm->max_reass_n);
1160 vlib_cli_output (vm,
1161 "Maximum configured amount of fragments per shallow "
1162 "virtual IP6 reassembly: %lu\n",
1163 (long unsigned) rm->max_reass_len);
1164 vlib_cli_output (vm,
1165 "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1166 (long unsigned) rm->timeout_ms);
1167 vlib_cli_output (vm,
1168 "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1169 (long unsigned) rm->expire_walk_interval_ms);
1170 vlib_cli_output (vm, "Buffers in use: %lu\n",
1171 (long unsigned) sum_buffers_n);
1176 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1177 .path = "show ip6-sv-reassembly",
1178 .short_help = "show ip6-sv-reassembly [details]",
1179 .function = show_ip6_sv_reass,
1183 #ifndef CLIB_MARCH_VARIANT
1185 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1187 return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1190 #endif /* CLIB_MARCH_VARIANT */
1192 #define foreach_ip6_sv_reassembly_handoff_error \
1193 _(CONGESTION_DROP, "congestion drop")
1198 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1199 foreach_ip6_sv_reassembly_handoff_error
1201 IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1202 } ip6_sv_reassembly_handoff_error_t;
1204 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1205 #define _(sym,string) string,
1206 foreach_ip6_sv_reassembly_handoff_error
1212 u32 next_worker_index;
1213 } ip6_sv_reassembly_handoff_trace_t;
1216 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1218 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1219 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1220 ip6_sv_reassembly_handoff_trace_t *t =
1221 va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1224 format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1225 t->next_worker_index);
1231 ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1232 vlib_node_runtime_t * node,
1233 vlib_frame_t * frame, bool is_feature)
1235 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1237 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1238 u32 n_enq, n_left_from, *from;
1239 u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1242 from = vlib_frame_vector_args (frame);
1243 n_left_from = frame->n_vectors;
1244 vlib_get_buffers (vm, from, bufs, n_left_from);
1247 ti = thread_indices;
1249 fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1251 while (n_left_from > 0)
1253 ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1256 ((node->flags & VLIB_NODE_FLAG_TRACE)
1257 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1259 ip6_sv_reassembly_handoff_trace_t *t =
1260 vlib_add_trace (vm, node, b[0], sizeof (*t));
1261 t->next_worker_index = ti[0];
1268 n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1269 thread_indices, frame->n_vectors, 1);
1271 if (n_enq < frame->n_vectors)
1272 vlib_node_increment_counter (vm, node->node_index,
1273 IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1274 frame->n_vectors - n_enq);
1275 return frame->n_vectors;
1278 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1279 vlib_node_runtime_t * node,
1280 vlib_frame_t * frame)
1282 return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1283 false /* is_feature */ );
1287 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1288 .name = "ip6-sv-reassembly-handoff",
1289 .vector_size = sizeof (u32),
1290 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1291 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1292 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1302 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1303 vlib_node_runtime_t * node, vlib_frame_t * frame)
1305 return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1310 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1311 .name = "ip6-sv-reass-feature-hoff",
1312 .vector_size = sizeof (u32),
1313 .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1314 .error_strings = ip6_sv_reassembly_handoff_error_strings,
1315 .format_trace = format_ip6_sv_reassembly_handoff_trace,
1325 #ifndef CLIB_MARCH_VARIANT
1327 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1329 ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1330 vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1333 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1335 ++rm->feature_use_refcount_per_intf[sw_if_index];
1336 return vnet_feature_enable_disable ("ip6-unicast",
1337 "ip6-sv-reassembly-feature",
1338 sw_if_index, 1, 0, 0);
1340 ++rm->feature_use_refcount_per_intf[sw_if_index];
1344 --rm->feature_use_refcount_per_intf[sw_if_index];
1345 if (!rm->feature_use_refcount_per_intf[sw_if_index])
1346 return vnet_feature_enable_disable ("ip6-unicast",
1347 "ip6-sv-reassembly-feature",
1348 sw_if_index, 0, 0, 0);
1355 * fd.io coding-style-patch-verification: ON
1358 * eval: (c-set-style "gnu")