ip6_sv_reass.c revision 407f593d
1/*
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:
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
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.
14 */
15
16/**
17 * @file
18 * @brief IPv6 Shallow Virtual Reassembly.
19 *
20 * This file contains the source code for IPv6 Shallow Virtual reassembly.
21 */
22
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
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)
36
37typedef enum
38{
39  IP6_SV_REASS_RC_OK,
40  IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
41  IP6_SV_REASS_RC_INTERNAL_ERROR,
42  IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
43} ip6_sv_reass_rc_t;
44
45typedef struct
46{
47  union
48  {
49    struct
50    {
51      ip6_address_t src;
52      ip6_address_t dst;
53      u32 xx_id;
54      u32 frag_id;
55      u8 unused[7];
56      u8 proto;
57    };
58    u64 as_u64[6];
59  };
60} ip6_sv_reass_key_t;
61
62typedef union
63{
64  struct
65  {
66    u32 reass_index;
67    u32 thread_index;
68  };
69  u64 as_u64;
70} ip6_sv_reass_val_t;
71
72typedef union
73{
74  struct
75  {
76    ip6_sv_reass_key_t k;
77    ip6_sv_reass_val_t v;
78  };
79  clib_bihash_kv_48_8_t kv;
80} ip6_sv_reass_kv_t;
81
82typedef struct
83{
84  // hash table key
85  ip6_sv_reass_key_t key;
86  // time when last packet was received
87  f64 last_heard;
88  // internal id of this reassembly
89  u64 id;
90  // trace operation counter
91  u32 trace_op_counter;
92  // buffer indexes of buffers in this reassembly in chronological order -
93  // including overlaps and duplicate fragments
94  u32 *cached_buffers;
95  // set to true when this reassembly is completed
96  bool is_complete;
97  // ip protocol
98  u8 ip_proto;
99  // l4 src port
100  u16 l4_src_port;
101  // l4 dst port
102  u16 l4_dst_port;
103  // lru indexes
104  u32 lru_prev;
105  u32 lru_next;
106} ip6_sv_reass_t;
107
108typedef struct
109{
110  ip6_sv_reass_t *pool;
111  u32 reass_n;
112  u32 id_counter;
113  clib_spinlock_t lock;
114  // lru indexes
115  u32 lru_first;
116  u32 lru_last;
117} ip6_sv_reass_per_thread_t;
118
119typedef struct
120{
121  // IPv6 config
122  u32 timeout_ms;
123  f64 timeout;
124  u32 expire_walk_interval_ms;
125  // maximum number of fragments in one reassembly
126  u32 max_reass_len;
127  // maximum number of reassemblies
128  u32 max_reass_n;
129
130  // IPv6 runtime
131  clib_bihash_48_8_t hash;
132
133  // per-thread data
134  ip6_sv_reass_per_thread_t *per_thread_data;
135
136  // convenience
137  vlib_main_t *vlib_main;
138  vnet_main_t *vnet_main;
139
140  // node index of ip6-drop node
141  u32 ip6_drop_idx;
142  u32 ip6_icmp_error_idx;
143  u32 ip6_sv_reass_expire_node_idx;
144
145  /** Worker handoff */
146  u32 fq_index;
147  u32 fq_feature_index;
148
149  // reference count for enabling/disabling feature - per interface
150  u32 *feature_use_refcount_per_intf;
151} ip6_sv_reass_main_t;
152
153extern ip6_sv_reass_main_t ip6_sv_reass_main;
154
155#ifndef CLIB_MARCH_VARIANT
156ip6_sv_reass_main_t ip6_sv_reass_main;
157#endif /* CLIB_MARCH_VARIANT */
158
159typedef enum
160{
161  IP6_SV_REASSEMBLY_NEXT_INPUT,
162  IP6_SV_REASSEMBLY_NEXT_DROP,
163  IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
164  IP6_SV_REASSEMBLY_NEXT_HANDOFF,
165  IP6_SV_REASSEMBLY_N_NEXT,
166} ip6_sv_reass_next_t;
167
168typedef enum
169{
170  REASS_FRAGMENT_CACHE,
171  REASS_FINISH,
172  REASS_FRAGMENT_FORWARD,
173} ip6_sv_reass_trace_operation_e;
174
175typedef struct
176{
177  ip6_sv_reass_trace_operation_e action;
178  u32 reass_id;
179  u32 op_id;
180  u8 ip_proto;
181  u16 l4_src_port;
182  u16 l4_dst_port;
183} ip6_sv_reass_trace_t;
184
185static u8 *
186format_ip6_sv_reass_trace (u8 * s, va_list * args)
187{
188  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
189  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
190  ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
191  s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
192  switch (t->action)
193    {
194    case REASS_FRAGMENT_CACHE:
195      s = format (s, "[cached]");
196      break;
197    case REASS_FINISH:
198      s =
199	format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
200		t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
201		clib_net_to_host_u16 (t->l4_dst_port));
202      break;
203    case REASS_FRAGMENT_FORWARD:
204      s =
205	format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
206		t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
207		clib_net_to_host_u16 (t->l4_dst_port));
208      break;
209    }
210  return s;
211}
212
213static void
214ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
215			ip6_sv_reass_main_t * rm,
216			ip6_sv_reass_t * reass, u32 bi,
217			ip6_sv_reass_trace_operation_e action,
218			u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
219{
220  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
221  ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
222  t->reass_id = reass->id;
223  t->action = action;
224  t->op_id = reass->trace_op_counter;
225  t->ip_proto = ip_proto;
226  t->l4_src_port = l4_src_port;
227  t->l4_dst_port = l4_dst_port;
228  ++reass->trace_op_counter;
229#if 0
230  static u8 *s = NULL;
231  s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
232  printf ("%.*s\n", vec_len (s), s);
233  fflush (stdout);
234  vec_reset_length (s);
235#endif
236}
237
238always_inline void
239ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
240		   ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
241{
242  clib_bihash_kv_48_8_t kv;
243  kv.key[0] = reass->key.as_u64[0];
244  kv.key[1] = reass->key.as_u64[1];
245  kv.key[2] = reass->key.as_u64[2];
246  kv.key[3] = reass->key.as_u64[3];
247  kv.key[4] = reass->key.as_u64[4];
248  kv.key[5] = reass->key.as_u64[5];
249  clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
250  vlib_buffer_free (vm, reass->cached_buffers,
251		    vec_len (reass->cached_buffers));
252  vec_free (reass->cached_buffers);
253  reass->cached_buffers = NULL;
254  if (~0 != reass->lru_prev)
255    {
256      ip6_sv_reass_t *lru_prev =
257	pool_elt_at_index (rt->pool, reass->lru_prev);
258      lru_prev->lru_next = reass->lru_next;
259    }
260  if (~0 != reass->lru_next)
261    {
262      ip6_sv_reass_t *lru_next =
263	pool_elt_at_index (rt->pool, reass->lru_next);
264      lru_next->lru_prev = reass->lru_prev;
265    }
266  if (rt->lru_first == reass - rt->pool)
267    {
268      rt->lru_first = reass->lru_next;
269    }
270  if (rt->lru_last == reass - rt->pool)
271    {
272      rt->lru_last = reass->lru_prev;
273    }
274  pool_put (rt->pool, reass);
275  --rt->reass_n;
276}
277
278always_inline void
279ip6_sv_reass_init (ip6_sv_reass_t * reass)
280{
281  reass->cached_buffers = NULL;
282  reass->is_complete = false;
283}
284
285always_inline ip6_sv_reass_t *
286ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
287			     ip6_sv_reass_main_t * rm,
288			     ip6_sv_reass_per_thread_t * rt,
289			     ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
290			     u8 * do_handoff)
291{
292  ip6_sv_reass_t *reass = NULL;
293  f64 now = vlib_time_now (rm->vlib_main);
294
295  if (!clib_bihash_search_48_8
296      (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
297    {
298      if (vm->thread_index != kv->v.thread_index)
299	{
300	  *do_handoff = 1;
301	  return NULL;
302	}
303      reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
304
305      if (now > reass->last_heard + rm->timeout)
306	{
307	  ip6_sv_reass_free (vm, rm, rt, reass);
308	  reass = NULL;
309	}
310    }
311
312  if (reass)
313    {
314      reass->last_heard = now;
315      return reass;
316    }
317
318  if (rt->reass_n >= rm->max_reass_n)
319    {
320      reass = pool_elt_at_index (rt->pool, rt->lru_last);
321      ip6_sv_reass_free (vm, rm, rt, reass);
322    }
323
324  pool_get (rt->pool, reass);
325  clib_memset (reass, 0, sizeof (*reass));
326  reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
327  ++rt->id_counter;
328  ip6_sv_reass_init (reass);
329  ++rt->reass_n;
330
331  reass->lru_prev = reass->lru_next = ~0;
332
333  if (~0 != rt->lru_last)
334    {
335      ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
336      reass->lru_prev = rt->lru_last;
337      lru_last->lru_next = rt->lru_last = reass - rt->pool;
338    }
339
340  if (~0 == rt->lru_first)
341    {
342      rt->lru_first = rt->lru_last = reass - rt->pool;
343    }
344
345  reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
346  reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
347  reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
348  reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
349  reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
350  reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
351  kv->v.reass_index = (reass - rt->pool);
352  kv->v.thread_index = vm->thread_index;
353  reass->last_heard = now;
354
355  if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 1))
356    {
357      ip6_sv_reass_free (vm, rm, rt, reass);
358      reass = NULL;
359    }
360
361  return reass;
362}
363
364always_inline ip6_sv_reass_rc_t
365ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
366		     ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
367		     ip6_sv_reass_t * reass, u32 bi0,
368		     ip6_frag_hdr_t * frag_hdr)
369{
370  vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
371  vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
372  fvnb->ip.reass.ip6_frag_hdr_offset =
373    (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
374  ip6_header_t *fip = vlib_buffer_get_current (fb);
375  if (fb->current_length < sizeof (*fip) ||
376      fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
377      fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
378    {
379      return IP6_SV_REASS_RC_INTERNAL_ERROR;
380    }
381
382  u32 fragment_first = fvnb->ip.reass.fragment_first =
383    ip6_frag_hdr_offset_bytes (frag_hdr);
384  u32 fragment_length =
385    vlib_buffer_length_in_chain (vm, fb) -
386    (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
387  u32 fragment_last = fvnb->ip.reass.fragment_last =
388    fragment_first + fragment_length - 1;
389  fvnb->ip.reass.range_first = fragment_first;
390  fvnb->ip.reass.range_last = fragment_last;
391  fvnb->ip.reass.next_range_bi = ~0;
392  if (0 == fragment_first)
393    {
394      ip6_ext_header_t *ext_hdr = (void *) frag_hdr;
395      while (ip6_ext_hdr (ext_hdr->next_hdr)
396	     && vlib_object_within_buffer_data (vm, fb, ext_hdr,
397						ext_hdr->n_data_u64s * 8))
398	{
399	  ext_hdr = ip6_ext_next_header (ext_hdr);
400	}
401      reass->ip_proto = ext_hdr->next_hdr;
402      reass->l4_src_port = ip6_get_port (fip, 1, fb->current_length);
403      reass->l4_dst_port = ip6_get_port (fip, 0, fb->current_length);
404      if (!reass->l4_src_port || !reass->l4_dst_port)
405	return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
406      reass->is_complete = true;
407      vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
408      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
409	{
410	  ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
411				  reass->ip_proto, reass->l4_src_port,
412				  reass->l4_dst_port);
413	}
414    }
415  vec_add1 (reass->cached_buffers, bi0);
416  if (!reass->is_complete)
417    {
418      if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
419	{
420	  ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
421				  REASS_FRAGMENT_CACHE, reass->ip_proto,
422				  reass->l4_src_port, reass->l4_dst_port);
423	}
424      if (vec_len (reass->cached_buffers) > rm->max_reass_len)
425	{
426	  return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
427	}
428    }
429  return IP6_SV_REASS_RC_OK;
430}
431
432always_inline bool
433ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
434					 vlib_buffer_t * b,
435					 ip6_frag_hdr_t * frag_hdr)
436{
437  ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
438  while (ip6_ext_hdr (tmp->next_hdr))
439    {
440      tmp = ip6_ext_next_header (tmp);
441    }
442  if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
443    {
444      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
445				   ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
446				   0);
447      b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
448
449      return false;
450    }
451  return true;
452}
453
454always_inline bool
455ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
456					 vlib_node_runtime_t * node,
457					 vlib_buffer_t * b,
458					 ip6_frag_hdr_t * frag_hdr)
459{
460  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
461  ip6_header_t *ip = vlib_buffer_get_current (b);
462  int more_fragments = ip6_frag_hdr_more (frag_hdr);
463  u32 fragment_length =
464    vlib_buffer_length_in_chain (vm, b) -
465    (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
466  if (more_fragments && 0 != fragment_length % 8)
467    {
468      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
469				   ICMP6_parameter_problem_erroneous_header_field,
470				   (u8 *) & ip->payload_length - (u8 *) ip);
471      return false;
472    }
473  return true;
474}
475
476always_inline bool
477ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
478					vlib_node_runtime_t * node,
479					vlib_buffer_t * b,
480					ip6_frag_hdr_t * frag_hdr)
481{
482  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
483  u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
484  u32 fragment_length =
485    vlib_buffer_length_in_chain (vm, b) -
486    (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
487  if (fragment_first + fragment_length > 65535)
488    {
489      ip6_header_t *ip0 = vlib_buffer_get_current (b);
490      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
491				   ICMP6_parameter_problem_erroneous_header_field,
492				   (u8 *) & frag_hdr->fragment_offset_and_more
493				   - (u8 *) ip0);
494      return false;
495    }
496  return true;
497}
498
499always_inline uword
500ip6_sv_reassembly_inline (vlib_main_t * vm,
501			  vlib_node_runtime_t * node,
502			  vlib_frame_t * frame, bool is_feature)
503{
504  u32 *from = vlib_frame_vector_args (frame);
505  u32 n_left_from, n_left_to_next, *to_next, next_index;
506  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
507  ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
508  clib_spinlock_lock (&rt->lock);
509
510  n_left_from = frame->n_vectors;
511  next_index = node->cached_next_index;
512
513  while (n_left_from > 0)
514    {
515      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
516
517      while (n_left_from > 0 && n_left_to_next > 0)
518	{
519	  u32 bi0;
520	  vlib_buffer_t *b0;
521	  u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
522	  u32 error0 = IP6_ERROR_NONE;
523	  u32 icmp_bi = ~0;
524
525	  bi0 = from[0];
526	  b0 = vlib_get_buffer (vm, bi0);
527
528	  ip6_header_t *ip0 = vlib_buffer_get_current (b0);
529	  ip6_frag_hdr_t *frag_hdr = NULL;
530	  ip6_ext_header_t *prev_hdr;
531	  if (ip6_ext_hdr (ip0->protocol))
532	    {
533	      frag_hdr =
534		ip6_ext_header_find (vm, b0, ip0,
535				     IP_PROTOCOL_IPV6_FRAGMENTATION,
536				     &prev_hdr);
537	    }
538	  if (!frag_hdr)
539	    {
540	      // this is a regular packet - no fragmentation
541	      vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
542	      vnet_buffer (b0)->ip.reass.l4_src_port =
543		ip6_get_port (ip0, 1, b0->current_length);
544	      vnet_buffer (b0)->ip.reass.l4_dst_port =
545		ip6_get_port (ip0, 0, b0->current_length);
546	      next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
547	      goto packet_enqueue;
548	    }
549	  vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
550	    (u8 *) frag_hdr - (u8 *) ip0;
551	  if (0 == ip6_frag_hdr_offset (frag_hdr))
552	    {
553	      // first fragment - verify upper-layer is present
554	      if (!ip6_sv_reass_verify_upper_layer_present
555		  (node, b0, frag_hdr))
556		{
557		  next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
558		  goto packet_enqueue;
559		}
560	    }
561	  if (!ip6_sv_reass_verify_fragment_multiple_8
562	      (vm, node, b0, frag_hdr)
563	      || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
564							  frag_hdr))
565	    {
566	      next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
567	      goto packet_enqueue;
568	    }
569
570	  ip6_sv_reass_kv_t kv;
571	  u8 do_handoff = 0;
572
573	  kv.k.as_u64[0] = ip0->src_address.as_u64[0];
574	  kv.k.as_u64[1] = ip0->src_address.as_u64[1];
575	  kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
576	  kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
577	  kv.k.as_u64[4] =
578	    ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
579			    vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
580	    (u64) frag_hdr->identification;
581	  kv.k.as_u64[5] = ip0->protocol;
582
583	  ip6_sv_reass_t *reass =
584	    ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
585					 &do_handoff);
586
587	  if (PREDICT_FALSE (do_handoff))
588	    {
589	      next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
590	      vnet_buffer (b0)->ip.reass.owner_thread_index =
591		kv.v.thread_index;
592	      goto packet_enqueue;
593	    }
594
595	  if (!reass)
596	    {
597	      next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
598	      error0 = IP6_ERROR_REASS_LIMIT_REACHED;
599	      goto packet_enqueue;
600	    }
601
602	  if (reass->is_complete)
603	    {
604	      vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
605	      vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
606	      vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
607	      next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
608	      error0 = IP6_ERROR_NONE;
609	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
610		{
611		  ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
612					  REASS_FRAGMENT_FORWARD,
613					  reass->ip_proto,
614					  reass->l4_src_port,
615					  reass->l4_dst_port);
616		}
617	      goto packet_enqueue;
618	    }
619
620	  switch (ip6_sv_reass_update
621		  (vm, node, rm, rt, reass, bi0, frag_hdr))
622	    {
623	    case IP6_SV_REASS_RC_OK:
624	      /* nothing to do here */
625	      break;
626	    case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
627	      vlib_node_increment_counter (vm, node->node_index,
628					   IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
629					   1);
630	      ip6_sv_reass_free (vm, rm, rt, reass);
631	      goto next_packet;
632	      break;
633	    case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
634	      vlib_node_increment_counter (vm, node->node_index,
635					   IP6_ERROR_REASS_UNSUPP_IP_PROTO,
636					   1);
637	      ip6_sv_reass_free (vm, rm, rt, reass);
638	      goto next_packet;
639	      break;
640	    case IP6_SV_REASS_RC_INTERNAL_ERROR:
641	      vlib_node_increment_counter (vm, node->node_index,
642					   IP6_ERROR_REASS_INTERNAL_ERROR, 1);
643	      ip6_sv_reass_free (vm, rm, rt, reass);
644	      goto next_packet;
645	      break;
646	    }
647
648	  b0->error = node->errors[error0];
649
650	  if (reass->is_complete)
651	    {
652	      u32 idx;
653	      vec_foreach_index (idx, reass->cached_buffers)
654	      {
655		u32 bi0 = vec_elt (reass->cached_buffers, idx);
656		if (0 == n_left_to_next)
657		  {
658		    vlib_put_next_frame (vm, node, next_index,
659					 n_left_to_next);
660		    vlib_get_next_frame (vm, node, next_index, to_next,
661					 n_left_to_next);
662		  }
663		to_next[0] = bi0;
664		to_next += 1;
665		n_left_to_next -= 1;
666		b0 = vlib_get_buffer (vm, bi0);
667		if (is_feature)
668		  {
669		    vnet_feature_next (&next0, b0);
670		  }
671		vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
672		vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
673		vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
674		if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
675		  {
676		    ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
677					    REASS_FRAGMENT_FORWARD,
678					    reass->ip_proto,
679					    reass->l4_src_port,
680					    reass->l4_dst_port);
681		  }
682		vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
683						 to_next, n_left_to_next, bi0,
684						 next0);
685	      }
686	      _vec_len (reass->cached_buffers) = 0;	// buffers are owned by frame now
687	    }
688	  goto next_packet;
689
690	packet_enqueue:
691	  to_next[0] = bi0;
692	  to_next += 1;
693	  n_left_to_next -= 1;
694	  if (is_feature && IP6_ERROR_NONE == error0)
695	    {
696	      b0 = vlib_get_buffer (vm, bi0);
697	      vnet_feature_next (&next0, b0);
698	    }
699	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
700					   n_left_to_next, bi0, next0);
701
702	  if (~0 != icmp_bi)
703	    {
704	      next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
705	      to_next[0] = icmp_bi;
706	      to_next += 1;
707	      n_left_to_next -= 1;
708	      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
709					       n_left_to_next, icmp_bi,
710					       next0);
711	    }
712
713	next_packet:
714	  from += 1;
715	  n_left_from -= 1;
716	}
717
718      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
719    }
720
721  clib_spinlock_unlock (&rt->lock);
722  return frame->n_vectors;
723}
724
725static char *ip6_sv_reassembly_error_strings[] = {
726#define _(sym, string) string,
727  foreach_ip6_error
728#undef _
729};
730
731VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
732				  vlib_node_runtime_t * node,
733				  vlib_frame_t * frame)
734{
735  return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
736}
737
738/* *INDENT-OFF* */
739VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
740    .name = "ip6-sv-reassembly",
741    .vector_size = sizeof (u32),
742    .format_trace = format_ip6_sv_reass_trace,
743    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
744    .error_strings = ip6_sv_reassembly_error_strings,
745    .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
746    .next_nodes =
747        {
748                [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
749                [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
750                [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
751                [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
752        },
753};
754/* *INDENT-ON* */
755
756VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
757					  vlib_node_runtime_t * node,
758					  vlib_frame_t * frame)
759{
760  return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
761}
762
763/* *INDENT-OFF* */
764VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
765    .name = "ip6-sv-reassembly-feature",
766    .vector_size = sizeof (u32),
767    .format_trace = format_ip6_sv_reass_trace,
768    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
769    .error_strings = ip6_sv_reassembly_error_strings,
770    .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
771    .next_nodes =
772        {
773                [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
774                [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
775                [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
776                [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
777        },
778};
779/* *INDENT-ON* */
780
781/* *INDENT-OFF* */
782VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
783    .arc_name = "ip6-unicast",
784    .node_name = "ip6-sv-reassembly-feature",
785    .runs_before = VNET_FEATURES ("ip6-lookup"),
786    .runs_after = 0,
787};
788/* *INDENT-ON* */
789
790#ifndef CLIB_MARCH_VARIANT
791static u32
792ip6_sv_reass_get_nbuckets ()
793{
794  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
795  u32 nbuckets;
796  u8 i;
797
798  nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
799
800  for (i = 0; i < 31; i++)
801    if ((1 << i) >= nbuckets)
802      break;
803  nbuckets = 1 << i;
804
805  return nbuckets;
806}
807#endif /* CLIB_MARCH_VARIANT */
808
809typedef enum
810{
811  IP6_EVENT_CONFIG_CHANGED = 1,
812} ip6_sv_reass_event_t;
813
814#ifndef CLIB_MARCH_VARIANT
815typedef struct
816{
817  int failure;
818  clib_bihash_48_8_t *new_hash;
819} ip6_rehash_cb_ctx;
820
821static void
822ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
823{
824  ip6_rehash_cb_ctx *ctx = _ctx;
825  if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
826    {
827      ctx->failure = 1;
828    }
829}
830
831static void
832ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
833			 u32 max_reassembly_length,
834			 u32 expire_walk_interval_ms)
835{
836  ip6_sv_reass_main.timeout_ms = timeout_ms;
837  ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
838  ip6_sv_reass_main.max_reass_n = max_reassemblies;
839  ip6_sv_reass_main.max_reass_len = max_reassembly_length;
840  ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
841}
842
843vnet_api_error_t
844ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
845		  u32 max_reassembly_length, u32 expire_walk_interval_ms)
846{
847  u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
848  ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
849			   max_reassembly_length, expire_walk_interval_ms);
850  vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
851			     ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
852			     IP6_EVENT_CONFIG_CHANGED, 0);
853  u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
854  if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
855    {
856      clib_bihash_48_8_t new_hash;
857      clib_memset (&new_hash, 0, sizeof (new_hash));
858      ip6_rehash_cb_ctx ctx;
859      ctx.failure = 0;
860      ctx.new_hash = &new_hash;
861      clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
862			     new_nbuckets * 1024);
863      clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
864					       ip6_rehash_cb, &ctx);
865      if (ctx.failure)
866	{
867	  clib_bihash_free_48_8 (&new_hash);
868	  return -1;
869	}
870      else
871	{
872	  clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
873	  clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
874			    sizeof (ip6_sv_reass_main.hash));
875	  clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
876	}
877    }
878  return 0;
879}
880
881vnet_api_error_t
882ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
883		  u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
884{
885  *timeout_ms = ip6_sv_reass_main.timeout_ms;
886  *max_reassemblies = ip6_sv_reass_main.max_reass_n;
887  *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
888  *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
889  return 0;
890}
891
892static clib_error_t *
893ip6_sv_reass_init_function (vlib_main_t * vm)
894{
895  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
896  clib_error_t *error = 0;
897  u32 nbuckets;
898  vlib_node_t *node;
899
900  rm->vlib_main = vm;
901  rm->vnet_main = vnet_get_main ();
902
903  vec_validate (rm->per_thread_data, vlib_num_workers ());
904  ip6_sv_reass_per_thread_t *rt;
905  vec_foreach (rt, rm->per_thread_data)
906  {
907    clib_spinlock_init (&rt->lock);
908    pool_alloc (rt->pool, rm->max_reass_n);
909    rt->lru_first = rt->lru_last = ~0;
910  }
911
912  node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
913  ASSERT (node);
914  rm->ip6_sv_reass_expire_node_idx = node->index;
915
916  ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
917			   IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
918			   IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
919			   IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
920
921  nbuckets = ip6_sv_reass_get_nbuckets ();
922  clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
923			 nbuckets * 1024);
924
925  node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
926  ASSERT (node);
927  rm->ip6_drop_idx = node->index;
928  node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
929  ASSERT (node);
930  rm->ip6_icmp_error_idx = node->index;
931
932  if ((error = vlib_call_init_function (vm, ip_main_init)))
933    return error;
934  ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
935			 ip6_sv_reass_node.index);
936
937  rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
938  rm->fq_feature_index =
939    vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
940
941  rm->feature_use_refcount_per_intf = NULL;
942
943  return error;
944}
945
946VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
947#endif /* CLIB_MARCH_VARIANT */
948
949static uword
950ip6_sv_reass_walk_expired (vlib_main_t * vm,
951			   vlib_node_runtime_t * node, vlib_frame_t * f)
952{
953  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
954  uword event_type, *event_data = 0;
955
956  while (true)
957    {
958      vlib_process_wait_for_event_or_clock (vm,
959					    (f64) rm->expire_walk_interval_ms
960					    / (f64) MSEC_PER_SEC);
961      event_type = vlib_process_get_events (vm, &event_data);
962
963      switch (event_type)
964	{
965	case ~0:		/* no events => timeout */
966	  /* nothing to do here */
967	  break;
968	case IP6_EVENT_CONFIG_CHANGED:
969	  break;
970	default:
971	  clib_warning ("BUG: event type 0x%wx", event_type);
972	  break;
973	}
974      f64 now = vlib_time_now (vm);
975
976      ip6_sv_reass_t *reass;
977      int *pool_indexes_to_free = NULL;
978
979      uword thread_index = 0;
980      int index;
981      const uword nthreads = vlib_num_workers () + 1;
982      for (thread_index = 0; thread_index < nthreads; ++thread_index)
983	{
984	  ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
985	  clib_spinlock_lock (&rt->lock);
986
987	  vec_reset_length (pool_indexes_to_free);
988          /* *INDENT-OFF* */
989          pool_foreach_index (index, rt->pool, ({
990                                reass = pool_elt_at_index (rt->pool, index);
991                                if (now > reass->last_heard + rm->timeout)
992                                  {
993                                    vec_add1 (pool_indexes_to_free, index);
994                                  }
995                              }));
996          /* *INDENT-ON* */
997	  int *i;
998          /* *INDENT-OFF* */
999          vec_foreach (i, pool_indexes_to_free)
1000          {
1001            ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1002            ip6_sv_reass_free (vm, rm, rt, reass);
1003          }
1004          /* *INDENT-ON* */
1005
1006	  clib_spinlock_unlock (&rt->lock);
1007	}
1008
1009      vec_free (pool_indexes_to_free);
1010      if (event_data)
1011	{
1012	  _vec_len (event_data) = 0;
1013	}
1014    }
1015
1016  return 0;
1017}
1018
1019/* *INDENT-OFF* */
1020VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1021    .function = ip6_sv_reass_walk_expired,
1022    .format_trace = format_ip6_sv_reass_trace,
1023    .type = VLIB_NODE_TYPE_PROCESS,
1024    .name = "ip6-sv-reassembly-expire-walk",
1025
1026    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
1027    .error_strings = ip6_sv_reassembly_error_strings,
1028
1029};
1030/* *INDENT-ON* */
1031
1032static u8 *
1033format_ip6_sv_reass_key (u8 * s, va_list * args)
1034{
1035  ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1036  s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1037	      key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1038	      &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1039  return s;
1040}
1041
1042static u8 *
1043format_ip6_sv_reass (u8 * s, va_list * args)
1044{
1045  vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1046  ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1047
1048  s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1049	      reass->id, format_ip6_sv_reass_key, &reass->key,
1050	      reass->trace_op_counter);
1051  vlib_buffer_t *b;
1052  u32 *bip;
1053  u32 counter = 0;
1054  vec_foreach (bip, reass->cached_buffers)
1055  {
1056    u32 bi = *bip;
1057    do
1058      {
1059	b = vlib_get_buffer (vm, bi);
1060	s = format (s, "  #%03u: bi: %u\n", counter, bi);
1061	++counter;
1062	bi = b->next_buffer;
1063      }
1064    while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1065  }
1066  return s;
1067}
1068
1069static clib_error_t *
1070show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1071		   CLIB_UNUSED (vlib_cli_command_t * lmd))
1072{
1073  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1074
1075  vlib_cli_output (vm, "---------------------");
1076  vlib_cli_output (vm, "IP6 reassembly status");
1077  vlib_cli_output (vm, "---------------------");
1078  bool details = false;
1079  if (unformat (input, "details"))
1080    {
1081      details = true;
1082    }
1083
1084  u32 sum_reass_n = 0;
1085  u64 sum_buffers_n = 0;
1086  ip6_sv_reass_t *reass;
1087  uword thread_index;
1088  const uword nthreads = vlib_num_workers () + 1;
1089  for (thread_index = 0; thread_index < nthreads; ++thread_index)
1090    {
1091      ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1092      clib_spinlock_lock (&rt->lock);
1093      if (details)
1094	{
1095          /* *INDENT-OFF* */
1096          pool_foreach (reass, rt->pool, {
1097            vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1098          });
1099          /* *INDENT-ON* */
1100	}
1101      sum_reass_n += rt->reass_n;
1102      clib_spinlock_unlock (&rt->lock);
1103    }
1104  vlib_cli_output (vm, "---------------------");
1105  vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1106		   (long unsigned) sum_reass_n);
1107  vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1108		   "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1109  vlib_cli_output (vm, "Buffers in use: %lu\n",
1110		   (long unsigned) sum_buffers_n);
1111  return 0;
1112}
1113
1114/* *INDENT-OFF* */
1115VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1116    .path = "show ip6-sv-reassembly",
1117    .short_help = "show ip6-sv-reassembly [details]",
1118    .function = show_ip6_sv_reass,
1119};
1120/* *INDENT-ON* */
1121
1122#ifndef CLIB_MARCH_VARIANT
1123vnet_api_error_t
1124ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1125{
1126  return vnet_feature_enable_disable ("ip6-unicast",
1127				      "ip6-sv-reassembly-feature",
1128				      sw_if_index, enable_disable, 0, 0);
1129}
1130#endif /* CLIB_MARCH_VARIANT */
1131
1132#define foreach_ip6_sv_reassembly_handoff_error                       \
1133_(CONGESTION_DROP, "congestion drop")
1134
1135
1136typedef enum
1137{
1138#define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1139  foreach_ip6_sv_reassembly_handoff_error
1140#undef _
1141    IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1142} ip6_sv_reassembly_handoff_error_t;
1143
1144static char *ip6_sv_reassembly_handoff_error_strings[] = {
1145#define _(sym,string) string,
1146  foreach_ip6_sv_reassembly_handoff_error
1147#undef _
1148};
1149
1150typedef struct
1151{
1152  u32 next_worker_index;
1153} ip6_sv_reassembly_handoff_trace_t;
1154
1155static u8 *
1156format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1157{
1158  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1159  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1160  ip6_sv_reassembly_handoff_trace_t *t =
1161    va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1162
1163  s =
1164    format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1165	    t->next_worker_index);
1166
1167  return s;
1168}
1169
1170always_inline uword
1171ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
1172				  vlib_node_runtime_t * node,
1173				  vlib_frame_t * frame, bool is_feature)
1174{
1175  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1176
1177  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1178  u32 n_enq, n_left_from, *from;
1179  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1180  u32 fq_index;
1181
1182  from = vlib_frame_vector_args (frame);
1183  n_left_from = frame->n_vectors;
1184  vlib_get_buffers (vm, from, bufs, n_left_from);
1185
1186  b = bufs;
1187  ti = thread_indices;
1188
1189  fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1190
1191  while (n_left_from > 0)
1192    {
1193      ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1194
1195      if (PREDICT_FALSE
1196	  ((node->flags & VLIB_NODE_FLAG_TRACE)
1197	   && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1198	{
1199	  ip6_sv_reassembly_handoff_trace_t *t =
1200	    vlib_add_trace (vm, node, b[0], sizeof (*t));
1201	  t->next_worker_index = ti[0];
1202	}
1203
1204      n_left_from -= 1;
1205      ti += 1;
1206      b += 1;
1207    }
1208  n_enq =
1209    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1210				   frame->n_vectors, 1);
1211
1212  if (n_enq < frame->n_vectors)
1213    vlib_node_increment_counter (vm, node->node_index,
1214				 IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1215				 frame->n_vectors - n_enq);
1216  return frame->n_vectors;
1217}
1218
1219VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1220					       vlib_node_runtime_t * node,
1221					       vlib_frame_t * frame)
1222{
1223  return ip6_sv_reassembly_handoff_inline (vm, node, frame,
1224					   false /* is_feature */ );
1225}
1226
1227/* *INDENT-OFF* */
1228VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1229  .name = "ip6-sv-reassembly-handoff",
1230  .vector_size = sizeof (u32),
1231  .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1232  .error_strings = ip6_sv_reassembly_handoff_error_strings,
1233  .format_trace = format_ip6_sv_reassembly_handoff_trace,
1234
1235  .n_next_nodes = 1,
1236
1237  .next_nodes = {
1238    [0] = "error-drop",
1239  },
1240};
1241
1242
1243VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1244                               vlib_node_runtime_t * node, vlib_frame_t * frame)
1245{
1246  return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1247}
1248
1249
1250/* *INDENT-OFF* */
1251VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1252  .name = "ip6-sv-reass-feature-hoff",
1253  .vector_size = sizeof (u32),
1254  .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1255  .error_strings = ip6_sv_reassembly_handoff_error_strings,
1256  .format_trace = format_ip6_sv_reassembly_handoff_trace,
1257
1258  .n_next_nodes = 1,
1259
1260  .next_nodes = {
1261    [0] = "error-drop",
1262  },
1263};
1264/* *INDENT-ON* */
1265
1266#ifndef CLIB_MARCH_VARIANT
1267int
1268ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1269{
1270  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1271  vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1272  if (is_enable)
1273    {
1274      if (!rm->feature_use_refcount_per_intf[sw_if_index])
1275	{
1276	  ++rm->feature_use_refcount_per_intf[sw_if_index];
1277	  return vnet_feature_enable_disable ("ip6-unicast",
1278					      "ip6-sv-reassembly-feature",
1279					      sw_if_index, 1, 0, 0);
1280	}
1281      ++rm->feature_use_refcount_per_intf[sw_if_index];
1282    }
1283  else
1284    {
1285      --rm->feature_use_refcount_per_intf[sw_if_index];
1286      if (!rm->feature_use_refcount_per_intf[sw_if_index])
1287	return vnet_feature_enable_disable ("ip6-unicast",
1288					    "ip6-sv-reassembly-feature",
1289					    sw_if_index, 0, 0, 0);
1290    }
1291  return 0;
1292}
1293#endif
1294
1295/*
1296 * fd.io coding-style-patch-verification: ON
1297 *
1298 * Local Variables:
1299 * eval: (c-set-style "gnu")
1300 * End:
1301 */
1302