ip: reassembly - custom context of ipv6
[vpp.git] / src / vnet / ip / reass / ip6_sv_reass.c
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 #include <vnet/ip/ip6_inlines.h>
30
31 #define MSEC_PER_SEC 1000
32 #define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
33 #define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
34 #define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
35 #define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
36 #define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
37
38 typedef enum
39 {
40   IP6_SV_REASS_RC_OK,
41   IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
42   IP6_SV_REASS_RC_INTERNAL_ERROR,
43   IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
44   IP6_SV_REASS_RC_INVALID_FRAG_LEN,
45 } ip6_sv_reass_rc_t;
46
47 typedef struct
48 {
49   union
50   {
51     struct
52     {
53       ip6_address_t src;
54       ip6_address_t dst;
55       u32 fib_index;
56       u32 frag_id;
57       u8 unused[7];
58       u8 proto;
59     };
60     u64 as_u64[6];
61   };
62 } ip6_sv_reass_key_t;
63
64 typedef union
65 {
66   struct
67   {
68     u32 reass_index;
69     u32 thread_index;
70   };
71   u64 as_u64;
72 } ip6_sv_reass_val_t;
73
74 typedef union
75 {
76   struct
77   {
78     ip6_sv_reass_key_t k;
79     ip6_sv_reass_val_t v;
80   };
81   clib_bihash_kv_48_8_t kv;
82 } ip6_sv_reass_kv_t;
83
84 typedef struct
85 {
86   // hash table key
87   ip6_sv_reass_key_t key;
88   // time when last packet was received
89   f64 last_heard;
90   // internal id of this reassembly
91   u64 id;
92   // trace operation counter
93   u32 trace_op_counter;
94   // buffer indexes of buffers in this reassembly in chronological order -
95   // including overlaps and duplicate fragments
96   u32 *cached_buffers;
97   // set to true when this reassembly is completed
98   bool is_complete;
99   // ip protocol
100   u8 ip_proto;
101   u8 icmp_type_or_tcp_flags;
102   u32 tcp_ack_number;
103   u32 tcp_seq_number;
104   // l4 src port
105   u16 l4_src_port;
106   // l4 dst port
107   u16 l4_dst_port;
108   // lru indexes
109   u32 lru_prev;
110   u32 lru_next;
111 } ip6_sv_reass_t;
112
113 typedef struct
114 {
115   ip6_sv_reass_t *pool;
116   u32 reass_n;
117   u32 id_counter;
118   clib_spinlock_t lock;
119   // lru indexes
120   u32 lru_first;
121   u32 lru_last;
122 } ip6_sv_reass_per_thread_t;
123
124 typedef struct
125 {
126   // IPv6 config
127   u32 timeout_ms;
128   f64 timeout;
129   u32 expire_walk_interval_ms;
130   // maximum number of fragments in one reassembly
131   u32 max_reass_len;
132   // maximum number of reassemblies
133   u32 max_reass_n;
134
135   // IPv6 runtime
136   clib_bihash_48_8_t hash;
137
138   // per-thread data
139   ip6_sv_reass_per_thread_t *per_thread_data;
140
141   // convenience
142   vlib_main_t *vlib_main;
143   vnet_main_t *vnet_main;
144
145   // node index of ip6-drop node
146   u32 ip6_drop_idx;
147   u32 ip6_icmp_error_idx;
148   u32 ip6_sv_reass_expire_node_idx;
149
150   /** Worker handoff */
151   u32 fq_index;
152   u32 fq_feature_index;
153   u32 fq_custom_context_index;
154
155   // reference count for enabling/disabling feature - per interface
156   u32 *feature_use_refcount_per_intf;
157 } ip6_sv_reass_main_t;
158
159 extern ip6_sv_reass_main_t ip6_sv_reass_main;
160
161 #ifndef CLIB_MARCH_VARIANT
162 ip6_sv_reass_main_t ip6_sv_reass_main;
163 #endif /* CLIB_MARCH_VARIANT */
164
165 typedef enum
166 {
167   IP6_SV_REASSEMBLY_NEXT_INPUT,
168   IP6_SV_REASSEMBLY_NEXT_DROP,
169   IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
170   IP6_SV_REASSEMBLY_NEXT_HANDOFF,
171   IP6_SV_REASSEMBLY_N_NEXT,
172 } ip6_sv_reass_next_t;
173
174 typedef enum
175 {
176   REASS_FRAGMENT_CACHE,
177   REASS_FINISH,
178   REASS_FRAGMENT_FORWARD,
179   REASS_PASSTHROUGH,
180 } ip6_sv_reass_trace_operation_e;
181
182 typedef struct
183 {
184   ip6_sv_reass_trace_operation_e action;
185   u32 reass_id;
186   u32 op_id;
187   u8 ip_proto;
188   u16 l4_src_port;
189   u16 l4_dst_port;
190 } ip6_sv_reass_trace_t;
191
192 static u8 *
193 format_ip6_sv_reass_trace (u8 * s, va_list * args)
194 {
195   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
196   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
197   ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
198   if (REASS_PASSTHROUGH != t->action)
199     {
200       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
201     }
202   switch (t->action)
203     {
204     case REASS_FRAGMENT_CACHE:
205       s = format (s, "[cached]");
206       break;
207     case REASS_FINISH:
208       s =
209         format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
210                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
211                 clib_net_to_host_u16 (t->l4_dst_port));
212       break;
213     case REASS_FRAGMENT_FORWARD:
214       s =
215         format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
216                 t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
217                 clib_net_to_host_u16 (t->l4_dst_port));
218       break;
219     case REASS_PASSTHROUGH:
220       s = format (s, "[not fragmented or atomic fragment]");
221       break;
222     }
223   return s;
224 }
225
226 static void
227 ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
228                         ip6_sv_reass_t * reass, u32 bi,
229                         ip6_sv_reass_trace_operation_e action,
230                         u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
231 {
232   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
233   if (pool_is_free_index
234       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
235     {
236       // this buffer's trace is gone
237       b->flags &= ~VLIB_BUFFER_IS_TRACED;
238       return;
239     }
240   ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
241   if (reass)
242     {
243       t->reass_id = reass->id;
244       t->op_id = reass->trace_op_counter;
245       ++reass->trace_op_counter;
246     }
247   t->action = action;
248   t->ip_proto = ip_proto;
249   t->l4_src_port = l4_src_port;
250   t->l4_dst_port = l4_dst_port;
251 #if 0
252   static u8 *s = NULL;
253   s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
254   printf ("%.*s\n", vec_len (s), s);
255   fflush (stdout);
256   vec_reset_length (s);
257 #endif
258 }
259
260 always_inline void
261 ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
262                    ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
263 {
264   clib_bihash_kv_48_8_t kv;
265   kv.key[0] = reass->key.as_u64[0];
266   kv.key[1] = reass->key.as_u64[1];
267   kv.key[2] = reass->key.as_u64[2];
268   kv.key[3] = reass->key.as_u64[3];
269   kv.key[4] = reass->key.as_u64[4];
270   kv.key[5] = reass->key.as_u64[5];
271   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
272   vlib_buffer_free (vm, reass->cached_buffers,
273                     vec_len (reass->cached_buffers));
274   vec_free (reass->cached_buffers);
275   reass->cached_buffers = NULL;
276   if (~0 != reass->lru_prev)
277     {
278       ip6_sv_reass_t *lru_prev =
279         pool_elt_at_index (rt->pool, reass->lru_prev);
280       lru_prev->lru_next = reass->lru_next;
281     }
282   if (~0 != reass->lru_next)
283     {
284       ip6_sv_reass_t *lru_next =
285         pool_elt_at_index (rt->pool, reass->lru_next);
286       lru_next->lru_prev = reass->lru_prev;
287     }
288   if (rt->lru_first == reass - rt->pool)
289     {
290       rt->lru_first = reass->lru_next;
291     }
292   if (rt->lru_last == reass - rt->pool)
293     {
294       rt->lru_last = reass->lru_prev;
295     }
296   pool_put (rt->pool, reass);
297   --rt->reass_n;
298 }
299
300 always_inline void
301 ip6_sv_reass_init (ip6_sv_reass_t * reass)
302 {
303   reass->cached_buffers = NULL;
304   reass->is_complete = false;
305 }
306
307 always_inline ip6_sv_reass_t *
308 ip6_sv_reass_find_or_create (vlib_main_t *vm, ip6_sv_reass_main_t *rm,
309                              ip6_sv_reass_per_thread_t *rt,
310                              ip6_sv_reass_kv_t *kv, u8 *do_handoff)
311 {
312   ip6_sv_reass_t *reass = NULL;
313   f64 now = vlib_time_now (vm);
314
315 again:
316
317   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
318     {
319       if (vm->thread_index != kv->v.thread_index)
320         {
321           *do_handoff = 1;
322           return NULL;
323         }
324       reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
325
326       if (now > reass->last_heard + rm->timeout)
327         {
328           ip6_sv_reass_free (vm, rm, rt, reass);
329           reass = NULL;
330         }
331     }
332
333   if (reass)
334     {
335       reass->last_heard = now;
336       return reass;
337     }
338
339   if (rt->reass_n >= rm->max_reass_n)
340     {
341       reass = pool_elt_at_index (rt->pool, rt->lru_first);
342       ip6_sv_reass_free (vm, rm, rt, reass);
343     }
344
345   pool_get (rt->pool, reass);
346   clib_memset (reass, 0, sizeof (*reass));
347   reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
348   ++rt->id_counter;
349   ip6_sv_reass_init (reass);
350   ++rt->reass_n;
351
352   reass->lru_prev = reass->lru_next = ~0;
353
354   if (~0 != rt->lru_last)
355     {
356       ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
357       reass->lru_prev = rt->lru_last;
358       lru_last->lru_next = rt->lru_last = reass - rt->pool;
359     }
360
361   if (~0 == rt->lru_first)
362     {
363       rt->lru_first = rt->lru_last = reass - rt->pool;
364     }
365
366   reass->key.as_u64[0] = kv->kv.key[0];
367   reass->key.as_u64[1] = kv->kv.key[1];
368   reass->key.as_u64[2] = kv->kv.key[2];
369   reass->key.as_u64[3] = kv->kv.key[3];
370   reass->key.as_u64[4] = kv->kv.key[4];
371   reass->key.as_u64[5] = kv->kv.key[5];
372   kv->v.reass_index = (reass - rt->pool);
373   kv->v.thread_index = vm->thread_index;
374   reass->last_heard = now;
375
376   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
377   if (rv)
378     {
379       ip6_sv_reass_free (vm, rm, rt, reass);
380       reass = NULL;
381       // if other worker created a context already work with the other copy
382       if (-2 == rv)
383         goto again;
384     }
385
386   return reass;
387 }
388
389 always_inline ip6_sv_reass_rc_t
390 ip6_sv_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
391                      ip6_sv_reass_main_t *rm, ip6_sv_reass_t *reass, u32 bi0,
392                      ip6_frag_hdr_t *frag_hdr)
393 {
394   vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
395   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
396   fvnb->ip.reass.ip6_frag_hdr_offset =
397     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
398   ip6_header_t *fip = vlib_buffer_get_current (fb);
399   if (fb->current_length < sizeof (*fip) ||
400       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
401       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
402     {
403       return IP6_SV_REASS_RC_INTERNAL_ERROR;
404     }
405
406   u32 fragment_first = fvnb->ip.reass.fragment_first =
407     ip6_frag_hdr_offset_bytes (frag_hdr);
408   u32 fragment_length =
409     vlib_buffer_length_in_chain (vm, fb) -
410     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
411   if (0 == fragment_length)
412     {
413       return IP6_SV_REASS_RC_INVALID_FRAG_LEN;
414     }
415   u32 fragment_last = fvnb->ip.reass.fragment_last =
416     fragment_first + fragment_length - 1;
417   fvnb->ip.reass.range_first = fragment_first;
418   fvnb->ip.reass.range_last = fragment_last;
419   fvnb->ip.reass.next_range_bi = ~0;
420   if (0 == fragment_first)
421     {
422       if (!ip6_get_port
423           (vm, fb, fip, fb->current_length, &reass->ip_proto,
424            &reass->l4_src_port, &reass->l4_dst_port,
425            &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
426            &reass->tcp_seq_number))
427         return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
428
429       reass->is_complete = true;
430       vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
431       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
432         {
433           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FINISH,
434                                   reass->ip_proto, reass->l4_src_port,
435                                   reass->l4_dst_port);
436         }
437     }
438   vec_add1 (reass->cached_buffers, bi0);
439   if (!reass->is_complete)
440     {
441       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
442         {
443           ip6_sv_reass_add_trace (vm, node, reass, bi0, REASS_FRAGMENT_CACHE,
444                                   reass->ip_proto, reass->l4_src_port,
445                                   reass->l4_dst_port);
446         }
447       if (vec_len (reass->cached_buffers) > rm->max_reass_len)
448         {
449           return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
450         }
451     }
452   return IP6_SV_REASS_RC_OK;
453 }
454
455 always_inline bool
456 ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
457                                          vlib_buffer_t *b,
458                                          ip6_ext_hdr_chain_t *hc)
459 {
460   int nh = hc->eh[hc->length - 1].protocol;
461   /* Checking to see if it's a terminating header */
462   if (ip6_ext_hdr (nh))
463     {
464       icmp6_error_set_vnet_buffer (
465         b, ICMP6_parameter_problem,
466         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
467       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
468       return false;
469     }
470   return true;
471 }
472
473 always_inline bool
474 ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
475                                          vlib_buffer_t * b,
476                                          ip6_frag_hdr_t * frag_hdr)
477 {
478   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
479   ip6_header_t *ip = vlib_buffer_get_current (b);
480   int more_fragments = ip6_frag_hdr_more (frag_hdr);
481   u32 fragment_length =
482     vlib_buffer_length_in_chain (vm, b) -
483     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
484   if (more_fragments && 0 != fragment_length % 8)
485     {
486       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
487                                    ICMP6_parameter_problem_erroneous_header_field,
488                                    (u8 *) & ip->payload_length - (u8 *) ip);
489       return false;
490     }
491   return true;
492 }
493
494 always_inline bool
495 ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
496                                         vlib_buffer_t * b,
497                                         ip6_frag_hdr_t * frag_hdr)
498 {
499   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
500   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
501   u32 fragment_length =
502     vlib_buffer_length_in_chain (vm, b) -
503     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
504   if (fragment_first + fragment_length > 65535)
505     {
506       ip6_header_t *ip0 = vlib_buffer_get_current (b);
507       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
508                                    ICMP6_parameter_problem_erroneous_header_field,
509                                    (u8 *) & frag_hdr->fragment_offset_and_more
510                                    - (u8 *) ip0);
511       return false;
512     }
513   return true;
514 }
515
516 always_inline uword
517 ip6_sv_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
518                           vlib_frame_t *frame, bool is_feature,
519                           bool custom_next, bool custom_context)
520 {
521   u32 *from = vlib_frame_vector_args (frame);
522   u32 n_left_from, n_left_to_next, *to_next, *to_next_aux, next_index;
523   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
524   ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
525   u32 *context;
526   if (custom_context)
527     context = vlib_frame_aux_args (frame);
528
529   clib_spinlock_lock (&rt->lock);
530
531   n_left_from = frame->n_vectors;
532   next_index = node->cached_next_index;
533
534   while (n_left_from > 0)
535     {
536       if (custom_context)
537         vlib_get_next_frame_with_aux_safe (vm, node, next_index, to_next,
538                                            to_next_aux, n_left_to_next);
539       else
540         vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
541
542       while (n_left_from > 0 && n_left_to_next > 0)
543         {
544           u32 bi0;
545           vlib_buffer_t *b0;
546           u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
547           u32 error0 = IP6_ERROR_NONE;
548           u8 forward_context = 0;
549           bi0 = from[0];
550           b0 = vlib_get_buffer (vm, bi0);
551
552           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
553           ip6_frag_hdr_t *frag_hdr;
554           ip6_ext_hdr_chain_t hdr_chain;
555           bool is_atomic_fragment = false;
556
557           int res = ip6_ext_header_walk (
558             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
559           if (res >= 0 &&
560               hdr_chain.eh[res].protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
561             {
562               frag_hdr =
563                 ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
564               is_atomic_fragment = (0 == ip6_frag_hdr_offset (frag_hdr) &&
565                                     !ip6_frag_hdr_more (frag_hdr));
566             }
567
568           if (res < 0 ||
569               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION ||
570               is_atomic_fragment)
571             {
572               // this is a regular unfragmented packet or an atomic fragment
573               if (!ip6_get_port
574                   (vm, b0, ip0, b0->current_length,
575                    &(vnet_buffer (b0)->ip.reass.ip_proto),
576                    &(vnet_buffer (b0)->ip.reass.l4_src_port),
577                    &(vnet_buffer (b0)->ip.reass.l4_dst_port),
578                    &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
579                    &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
580                    &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
581                 {
582                   error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
583                   b0->error = node->errors[error0];
584                   next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
585                   goto packet_enqueue;
586                 }
587               vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
588               next0 = custom_next ? vnet_buffer (b0)->ip.reass.next_index :
589                                           IP6_SV_REASSEMBLY_NEXT_INPUT;
590               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
591                 {
592                   ip6_sv_reass_add_trace (
593                     vm, node, NULL, bi0, REASS_PASSTHROUGH,
594                     vnet_buffer (b0)->ip.reass.ip_proto,
595                     vnet_buffer (b0)->ip.reass.l4_src_port,
596                     vnet_buffer (b0)->ip.reass.l4_dst_port);
597                 }
598               goto packet_enqueue;
599             }
600
601           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
602             hdr_chain.eh[res].offset;
603
604           if (0 == ip6_frag_hdr_offset (frag_hdr))
605             {
606               // first fragment - verify upper-layer is present
607               if (!ip6_sv_reass_verify_upper_layer_present (node, b0,
608                                                             &hdr_chain))
609                 {
610                   next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
611                   goto packet_enqueue;
612                 }
613             }
614           if (!ip6_sv_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
615               !ip6_sv_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
616             {
617               next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
618               goto packet_enqueue;
619             }
620
621           ip6_sv_reass_kv_t kv;
622           u8 do_handoff = 0;
623
624           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
625           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
626           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
627           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
628           if (custom_context)
629             kv.k.as_u64[4] =
630               (u64) *context << 32 | (u64) frag_hdr->identification;
631           else
632             kv.k.as_u64[4] =
633               ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
634                               vnet_buffer (b0)->sw_if_index[VLIB_RX]))
635                 << 32 |
636               (u64) frag_hdr->identification;
637           kv.k.as_u64[5] = ip0->protocol;
638
639           ip6_sv_reass_t *reass =
640             ip6_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
641
642           if (PREDICT_FALSE (do_handoff))
643             {
644               next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
645               vnet_buffer (b0)->ip.reass.owner_thread_index =
646                 kv.v.thread_index;
647               if (custom_context)
648                 forward_context = 1;
649               goto packet_enqueue;
650             }
651
652           if (!reass)
653             {
654               next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
655               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
656               b0->error = node->errors[error0];
657               goto packet_enqueue;
658             }
659
660           if (reass->is_complete)
661             {
662               vnet_buffer (b0)->ip.reass.is_non_first_fragment =
663                 ! !ip6_frag_hdr_offset (frag_hdr);
664               vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
665               vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
666                 reass->icmp_type_or_tcp_flags;
667               vnet_buffer (b0)->ip.reass.tcp_ack_number =
668                 reass->tcp_ack_number;
669               vnet_buffer (b0)->ip.reass.tcp_seq_number =
670                 reass->tcp_seq_number;
671               vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
672               vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
673               next0 = custom_next ? vnet_buffer (b0)->ip.reass.next_index :
674                                           IP6_SV_REASSEMBLY_NEXT_INPUT;
675               if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
676                 {
677                   ip6_sv_reass_add_trace (
678                     vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
679                     reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
680                 }
681               goto packet_enqueue;
682             }
683
684           u32 counter = ~0;
685           switch (ip6_sv_reass_update (vm, node, rm, reass, bi0, frag_hdr))
686             {
687             case IP6_SV_REASS_RC_OK:
688               /* nothing to do here */
689               break;
690             case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
691               counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
692               break;
693             case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
694               counter = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
695               break;
696             case IP6_SV_REASS_RC_INTERNAL_ERROR:
697               counter = IP6_ERROR_REASS_INTERNAL_ERROR;
698               break;
699             case IP6_SV_REASS_RC_INVALID_FRAG_LEN:
700               counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
701               break;
702             }
703           if (~0 != counter)
704             {
705               vlib_node_increment_counter (vm, node->node_index, counter, 1);
706               ip6_sv_reass_free (vm, rm, rt, reass);
707               goto next_packet;
708             }
709
710           if (reass->is_complete)
711             {
712               u32 idx;
713               vec_foreach_index (idx, reass->cached_buffers)
714               {
715                 u32 bi0 = vec_elt (reass->cached_buffers, idx);
716                 if (0 == n_left_to_next)
717                   {
718                     vlib_put_next_frame (vm, node, next_index,
719                                          n_left_to_next);
720                     vlib_get_next_frame (vm, node, next_index, to_next,
721                                          n_left_to_next);
722                   }
723                 to_next[0] = bi0;
724                 to_next += 1;
725                 n_left_to_next -= 1;
726                 b0 = vlib_get_buffer (vm, bi0);
727                 if (is_feature)
728                   {
729                     vnet_feature_next (&next0, b0);
730                   }
731                 frag_hdr =
732                   vlib_buffer_get_current (b0) +
733                   vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
734                 vnet_buffer (b0)->ip.reass.is_non_first_fragment =
735                   ! !ip6_frag_hdr_offset (frag_hdr);
736                 vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
737                 vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
738                   reass->icmp_type_or_tcp_flags;
739                 vnet_buffer (b0)->ip.reass.tcp_ack_number =
740                   reass->tcp_ack_number;
741                 vnet_buffer (b0)->ip.reass.tcp_seq_number =
742                   reass->tcp_seq_number;
743                 vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
744                 vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
745                 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
746                   {
747                     ip6_sv_reass_add_trace (
748                       vm, node, reass, bi0, REASS_FRAGMENT_FORWARD,
749                       reass->ip_proto, reass->l4_src_port, reass->l4_dst_port);
750                   }
751                 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
752                                                  to_next, n_left_to_next, bi0,
753                                                  next0);
754               }
755               vec_set_len (reass->cached_buffers,
756                            0); // buffers are owned by frame now
757             }
758           goto next_packet;
759
760         packet_enqueue:
761           to_next[0] = bi0;
762           to_next += 1;
763           n_left_to_next -= 1;
764           if (is_feature && IP6_ERROR_NONE == error0)
765             {
766               b0 = vlib_get_buffer (vm, bi0);
767               vnet_feature_next (&next0, b0);
768             }
769           if (custom_context && forward_context)
770             {
771               if (to_next_aux)
772                 {
773                   to_next_aux[0] = *context;
774                   to_next_aux += 1;
775                 }
776               vlib_validate_buffer_enqueue_with_aux_x1 (
777                 vm, node, next_index, to_next, to_next_aux, n_left_to_next,
778                 bi0, *context, next0);
779             }
780           else
781             vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
782                                              n_left_to_next, bi0, next0);
783
784         next_packet:
785           from += 1;
786           if (custom_context)
787             context += 1;
788           n_left_from -= 1;
789         }
790
791       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
792     }
793
794   clib_spinlock_unlock (&rt->lock);
795   return frame->n_vectors;
796 }
797
798 VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
799                                   vlib_node_runtime_t * node,
800                                   vlib_frame_t * frame)
801 {
802   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */,
803                                    false /* custom next */,
804                                    false /* custom context */);
805 }
806
807 /* *INDENT-OFF* */
808 VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
809     .name = "ip6-sv-reassembly",
810     .vector_size = sizeof (u32),
811     .format_trace = format_ip6_sv_reass_trace,
812     .n_errors = IP6_N_ERROR,
813     .error_counters = ip6_error_counters,
814     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
815     .next_nodes =
816         {
817                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
818                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
819                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
820                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
821         },
822 };
823 /* *INDENT-ON* */
824
825 VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
826                                           vlib_node_runtime_t * node,
827                                           vlib_frame_t * frame)
828 {
829   return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */,
830                                    false /* custom next */,
831                                    false /* custom context */);
832 }
833
834 /* *INDENT-OFF* */
835 VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
836     .name = "ip6-sv-reassembly-feature",
837     .vector_size = sizeof (u32),
838     .format_trace = format_ip6_sv_reass_trace,
839     .n_errors = IP6_N_ERROR,
840     .error_counters = ip6_error_counters,
841     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
842     .next_nodes =
843         {
844                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
845                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
846                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
847                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
848         },
849 };
850 /* *INDENT-ON* */
851
852 /* *INDENT-OFF* */
853 VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
854     .arc_name = "ip6-unicast",
855     .node_name = "ip6-sv-reassembly-feature",
856     .runs_before = VNET_FEATURES ("ip6-lookup"),
857     .runs_after = 0,
858 };
859 /* *INDENT-ON* */
860
861 VLIB_NODE_FN (ip6_sv_reass_custom_context_node)
862 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
863 {
864   return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */,
865                                    true /* custom next */,
866                                    true /* custom context */);
867 }
868
869 VLIB_REGISTER_NODE (ip6_sv_reass_custom_context_node) = {
870     .name = "ip6-sv-reassembly-custom-context",
871     .vector_size = sizeof (u32),
872     .aux_size = sizeof (u32),
873     .format_trace = format_ip6_sv_reass_trace,
874     .n_errors = IP6_N_ERROR,
875     .error_counters = ip6_error_counters,
876     .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
877     .next_nodes =
878         {
879                 [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
880                 [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
881                 [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
882                 [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-custom-context-handoff",
883         },
884 };
885
886 #ifndef CLIB_MARCH_VARIANT
887 static u32
888 ip6_sv_reass_get_nbuckets ()
889 {
890   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
891   u32 nbuckets;
892   u8 i;
893
894   nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
895
896   for (i = 0; i < 31; i++)
897     if ((1 << i) >= nbuckets)
898       break;
899   nbuckets = 1 << i;
900
901   return nbuckets;
902 }
903 #endif /* CLIB_MARCH_VARIANT */
904
905 typedef enum
906 {
907   IP6_EVENT_CONFIG_CHANGED = 1,
908 } ip6_sv_reass_event_t;
909
910 #ifndef CLIB_MARCH_VARIANT
911 typedef struct
912 {
913   int failure;
914   clib_bihash_48_8_t *new_hash;
915 } ip6_rehash_cb_ctx;
916
917 static int
918 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
919 {
920   ip6_rehash_cb_ctx *ctx = _ctx;
921   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
922     {
923       ctx->failure = 1;
924     }
925   return (BIHASH_WALK_CONTINUE);
926 }
927
928 static void
929 ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
930                          u32 max_reassembly_length,
931                          u32 expire_walk_interval_ms)
932 {
933   ip6_sv_reass_main.timeout_ms = timeout_ms;
934   ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
935   ip6_sv_reass_main.max_reass_n = max_reassemblies;
936   ip6_sv_reass_main.max_reass_len = max_reassembly_length;
937   ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
938 }
939
940 vnet_api_error_t
941 ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
942                   u32 max_reassembly_length, u32 expire_walk_interval_ms)
943 {
944   u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
945   ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
946                            max_reassembly_length, expire_walk_interval_ms);
947   vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
948                              ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
949                              IP6_EVENT_CONFIG_CHANGED, 0);
950   u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
951   if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
952     {
953       clib_bihash_48_8_t new_hash;
954       clib_memset (&new_hash, 0, sizeof (new_hash));
955       ip6_rehash_cb_ctx ctx;
956       ctx.failure = 0;
957       ctx.new_hash = &new_hash;
958       clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
959                              new_nbuckets * 1024);
960       clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
961                                                ip6_rehash_cb, &ctx);
962       if (ctx.failure)
963         {
964           clib_bihash_free_48_8 (&new_hash);
965           return -1;
966         }
967       else
968         {
969           clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
970           clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
971                             sizeof (ip6_sv_reass_main.hash));
972           clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
973         }
974     }
975   return 0;
976 }
977
978 vnet_api_error_t
979 ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
980                   u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
981 {
982   *timeout_ms = ip6_sv_reass_main.timeout_ms;
983   *max_reassemblies = ip6_sv_reass_main.max_reass_n;
984   *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
985   *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
986   return 0;
987 }
988
989 static clib_error_t *
990 ip6_sv_reass_init_function (vlib_main_t * vm)
991 {
992   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
993   clib_error_t *error = 0;
994   u32 nbuckets;
995   vlib_node_t *node;
996
997   rm->vlib_main = vm;
998   rm->vnet_main = vnet_get_main ();
999
1000   vec_validate (rm->per_thread_data, vlib_num_workers ());
1001   ip6_sv_reass_per_thread_t *rt;
1002   vec_foreach (rt, rm->per_thread_data)
1003   {
1004     clib_spinlock_init (&rt->lock);
1005     pool_alloc (rt->pool, rm->max_reass_n);
1006     rt->lru_first = rt->lru_last = ~0;
1007   }
1008
1009   node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
1010   ASSERT (node);
1011   rm->ip6_sv_reass_expire_node_idx = node->index;
1012
1013   ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
1014                            IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
1015                            IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1016                            IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1017
1018   nbuckets = ip6_sv_reass_get_nbuckets ();
1019   clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
1020                          nbuckets * 1024);
1021
1022   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1023   ASSERT (node);
1024   rm->ip6_drop_idx = node->index;
1025   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1026   ASSERT (node);
1027   rm->ip6_icmp_error_idx = node->index;
1028
1029   if ((error = vlib_call_init_function (vm, ip_main_init)))
1030     return error;
1031
1032   rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
1033   rm->fq_feature_index =
1034     vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
1035   rm->fq_custom_context_index =
1036     vlib_frame_queue_main_init (ip6_sv_reass_custom_context_node.index, 0);
1037
1038   rm->feature_use_refcount_per_intf = NULL;
1039
1040   return error;
1041 }
1042
1043 VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
1044 #endif /* CLIB_MARCH_VARIANT */
1045
1046 static uword
1047 ip6_sv_reass_walk_expired (vlib_main_t *vm,
1048                            CLIB_UNUSED (vlib_node_runtime_t *node),
1049                            CLIB_UNUSED (vlib_frame_t *f))
1050 {
1051   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1052   uword event_type, *event_data = 0;
1053
1054   while (true)
1055     {
1056       vlib_process_wait_for_event_or_clock (vm,
1057                                             (f64) rm->expire_walk_interval_ms
1058                                             / (f64) MSEC_PER_SEC);
1059       event_type = vlib_process_get_events (vm, &event_data);
1060
1061       switch (event_type)
1062         {
1063         case ~0:
1064           /* no events => timeout */
1065           /* fallthrough */
1066         case IP6_EVENT_CONFIG_CHANGED:
1067           /* nothing to do here */
1068           break;
1069         default:
1070           clib_warning ("BUG: event type 0x%wx", event_type);
1071           break;
1072         }
1073       f64 now = vlib_time_now (vm);
1074
1075       ip6_sv_reass_t *reass;
1076       int *pool_indexes_to_free = NULL;
1077
1078       uword thread_index = 0;
1079       int index;
1080       const uword nthreads = vlib_num_workers () + 1;
1081       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1082         {
1083           ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1084           clib_spinlock_lock (&rt->lock);
1085
1086           vec_reset_length (pool_indexes_to_free);
1087           /* *INDENT-OFF* */
1088           pool_foreach_index (index, rt->pool)  {
1089                                 reass = pool_elt_at_index (rt->pool, index);
1090                                 if (now > reass->last_heard + rm->timeout)
1091                                   {
1092                                     vec_add1 (pool_indexes_to_free, index);
1093                                   }
1094                               }
1095           /* *INDENT-ON* */
1096           int *i;
1097           /* *INDENT-OFF* */
1098           vec_foreach (i, pool_indexes_to_free)
1099           {
1100             ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1101             ip6_sv_reass_free (vm, rm, rt, reass);
1102           }
1103           /* *INDENT-ON* */
1104
1105           clib_spinlock_unlock (&rt->lock);
1106         }
1107
1108       vec_free (pool_indexes_to_free);
1109       if (event_data)
1110         {
1111           vec_set_len (event_data, 0);
1112         }
1113     }
1114
1115   return 0;
1116 }
1117
1118 /* *INDENT-OFF* */
1119 VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
1120   .function = ip6_sv_reass_walk_expired,
1121   .format_trace = format_ip6_sv_reass_trace,
1122   .type = VLIB_NODE_TYPE_PROCESS,
1123   .name = "ip6-sv-reassembly-expire-walk",
1124
1125   .n_errors = IP6_N_ERROR,
1126   .error_counters = ip6_error_counters,
1127 };
1128 /* *INDENT-ON* */
1129
1130 static u8 *
1131 format_ip6_sv_reass_key (u8 * s, va_list * args)
1132 {
1133   ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
1134   s =
1135     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1136             key->fib_index, format_ip6_address, &key->src, format_ip6_address,
1137             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1138   return s;
1139 }
1140
1141 static u8 *
1142 format_ip6_sv_reass (u8 * s, va_list * args)
1143 {
1144   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1145   ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
1146
1147   s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
1148               reass->id, format_ip6_sv_reass_key, &reass->key,
1149               reass->trace_op_counter);
1150   vlib_buffer_t *b;
1151   u32 *bip;
1152   u32 counter = 0;
1153   vec_foreach (bip, reass->cached_buffers)
1154   {
1155     u32 bi = *bip;
1156     do
1157       {
1158         b = vlib_get_buffer (vm, bi);
1159         s = format (s, "  #%03u: bi: %u\n", counter, bi);
1160         ++counter;
1161         bi = b->next_buffer;
1162       }
1163     while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
1164   }
1165   return s;
1166 }
1167
1168 static clib_error_t *
1169 show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
1170                    CLIB_UNUSED (vlib_cli_command_t * lmd))
1171 {
1172   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1173
1174   vlib_cli_output (vm, "---------------------");
1175   vlib_cli_output (vm, "IP6 reassembly status");
1176   vlib_cli_output (vm, "---------------------");
1177   bool details = false;
1178   if (unformat (input, "details"))
1179     {
1180       details = true;
1181     }
1182
1183   u32 sum_reass_n = 0;
1184   u64 sum_buffers_n = 0;
1185   ip6_sv_reass_t *reass;
1186   uword thread_index;
1187   const uword nthreads = vlib_num_workers () + 1;
1188   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1189     {
1190       ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1191       clib_spinlock_lock (&rt->lock);
1192       if (details)
1193         {
1194           /* *INDENT-OFF* */
1195           pool_foreach (reass, rt->pool) {
1196             vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
1197           }
1198           /* *INDENT-ON* */
1199         }
1200       sum_reass_n += rt->reass_n;
1201       clib_spinlock_unlock (&rt->lock);
1202     }
1203   vlib_cli_output (vm, "---------------------");
1204   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1205                    (long unsigned) sum_reass_n);
1206   vlib_cli_output (vm,
1207                    "Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
1208                    (long unsigned) rm->max_reass_n);
1209   vlib_cli_output (vm,
1210                    "Maximum configured amount of fragments per shallow "
1211                    "virtual IP6 reassembly: %lu\n",
1212                    (long unsigned) rm->max_reass_len);
1213   vlib_cli_output (vm,
1214                    "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
1215                    (long unsigned) rm->timeout_ms);
1216   vlib_cli_output (vm,
1217                    "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
1218                    (long unsigned) rm->expire_walk_interval_ms);
1219   vlib_cli_output (vm, "Buffers in use: %lu\n",
1220                    (long unsigned) sum_buffers_n);
1221   return 0;
1222 }
1223
1224 /* *INDENT-OFF* */
1225 VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
1226     .path = "show ip6-sv-reassembly",
1227     .short_help = "show ip6-sv-reassembly [details]",
1228     .function = show_ip6_sv_reass,
1229 };
1230 /* *INDENT-ON* */
1231
1232 #ifndef CLIB_MARCH_VARIANT
1233 vnet_api_error_t
1234 ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1235 {
1236   return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
1237                                                   enable_disable);
1238 }
1239 #endif /* CLIB_MARCH_VARIANT */
1240
1241 #define foreach_ip6_sv_reassembly_handoff_error                       \
1242 _(CONGESTION_DROP, "congestion drop")
1243
1244
1245 typedef enum
1246 {
1247 #define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
1248   foreach_ip6_sv_reassembly_handoff_error
1249 #undef _
1250     IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
1251 } ip6_sv_reassembly_handoff_error_t;
1252
1253 static char *ip6_sv_reassembly_handoff_error_strings[] = {
1254 #define _(sym,string) string,
1255   foreach_ip6_sv_reassembly_handoff_error
1256 #undef _
1257 };
1258
1259 typedef struct
1260 {
1261   u32 next_worker_index;
1262 } ip6_sv_reassembly_handoff_trace_t;
1263
1264 static u8 *
1265 format_ip6_sv_reassembly_handoff_trace (u8 * s, va_list * args)
1266 {
1267   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1268   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1269   ip6_sv_reassembly_handoff_trace_t *t =
1270     va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
1271
1272   s =
1273     format (s, "ip6-sv-reassembly-handoff: next-worker %d",
1274             t->next_worker_index);
1275
1276   return s;
1277 }
1278
1279 always_inline uword
1280 ip6_sv_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1281                                   vlib_frame_t *frame, bool is_feature,
1282                                   bool custom_context)
1283 {
1284   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1285
1286   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1287   u32 n_enq, n_left_from, *from, *context;
1288   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1289   u32 fq_index;
1290
1291   from = vlib_frame_vector_args (frame);
1292   if (custom_context)
1293     context = vlib_frame_aux_args (frame);
1294   n_left_from = frame->n_vectors;
1295   vlib_get_buffers (vm, from, bufs, n_left_from);
1296
1297   b = bufs;
1298   ti = thread_indices;
1299
1300   fq_index = (is_feature) ?
1301                      rm->fq_feature_index :
1302                      (custom_context ? rm->fq_custom_context_index : rm->fq_index);
1303
1304   while (n_left_from > 0)
1305     {
1306       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1307
1308       if (PREDICT_FALSE
1309           ((node->flags & VLIB_NODE_FLAG_TRACE)
1310            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1311         {
1312           ip6_sv_reassembly_handoff_trace_t *t =
1313             vlib_add_trace (vm, node, b[0], sizeof (*t));
1314           t->next_worker_index = ti[0];
1315         }
1316
1317       n_left_from -= 1;
1318       ti += 1;
1319       b += 1;
1320     }
1321   if (custom_context)
1322     n_enq = vlib_buffer_enqueue_to_thread_with_aux (
1323       vm, node, fq_index, from, context, thread_indices, frame->n_vectors, 1);
1324   else
1325     n_enq = vlib_buffer_enqueue_to_thread (
1326       vm, node, fq_index, from, thread_indices, frame->n_vectors, 1);
1327
1328   if (n_enq < frame->n_vectors)
1329     vlib_node_increment_counter (vm, node->node_index,
1330                                  IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1331                                  frame->n_vectors - n_enq);
1332   return frame->n_vectors;
1333 }
1334
1335 VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
1336                                                vlib_node_runtime_t * node,
1337                                                vlib_frame_t * frame)
1338 {
1339   return ip6_sv_reassembly_handoff_inline (
1340     vm, node, frame, false /* is_feature */, false /* custom_context */);
1341 }
1342
1343 /* *INDENT-OFF* */
1344 VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
1345   .name = "ip6-sv-reassembly-handoff",
1346   .vector_size = sizeof (u32),
1347   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1348   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1349   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1350
1351   .n_next_nodes = 1,
1352
1353   .next_nodes = {
1354     [0] = "error-drop",
1355   },
1356 };
1357
1358
1359 VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
1360                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1361 {
1362   return ip6_sv_reassembly_handoff_inline (
1363     vm, node, frame, true /* is_feature */, false /* custom_context */);
1364 }
1365
1366
1367 /* *INDENT-OFF* */
1368 VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
1369   .name = "ip6-sv-reass-feature-hoff",
1370   .vector_size = sizeof (u32),
1371   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1372   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1373   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1374
1375   .n_next_nodes = 1,
1376
1377   .next_nodes = {
1378     [0] = "error-drop",
1379   },
1380 };
1381 /* *INDENT-ON* */
1382
1383 VLIB_NODE_FN (ip6_sv_reassembly_custom_context_handoff_node)
1384 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1385 {
1386   return ip6_sv_reassembly_handoff_inline (
1387     vm, node, frame, false /* is_feature */, true /* custom_context */);
1388 }
1389
1390 VLIB_REGISTER_NODE (ip6_sv_reassembly_custom_context_handoff_node) = {
1391   .name = "ip6-sv-reassembly-custom-context-handoff",
1392   .vector_size = sizeof (u32),
1393   .aux_size = sizeof (u32),
1394   .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
1395   .error_strings = ip6_sv_reassembly_handoff_error_strings,
1396   .format_trace = format_ip6_sv_reassembly_handoff_trace,
1397
1398   .n_next_nodes = 1,
1399
1400   .next_nodes = {
1401     [0] = "error-drop",
1402   },
1403 };
1404
1405 #ifndef CLIB_MARCH_VARIANT
1406 int
1407 ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1408 {
1409   ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
1410   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1411   if (is_enable)
1412     {
1413       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1414         {
1415           ++rm->feature_use_refcount_per_intf[sw_if_index];
1416           return vnet_feature_enable_disable ("ip6-unicast",
1417                                               "ip6-sv-reassembly-feature",
1418                                               sw_if_index, 1, 0, 0);
1419         }
1420       ++rm->feature_use_refcount_per_intf[sw_if_index];
1421     }
1422   else
1423     {
1424       --rm->feature_use_refcount_per_intf[sw_if_index];
1425       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1426         return vnet_feature_enable_disable ("ip6-unicast",
1427                                             "ip6-sv-reassembly-feature",
1428                                             sw_if_index, 0, 0, 0);
1429     }
1430   return 0;
1431 }
1432
1433 uword
1434 ip6_sv_reass_custom_context_register_next_node (uword node_index)
1435 {
1436   return vlib_node_add_next (
1437     vlib_get_main (), ip6_sv_reassembly_custom_context_handoff_node.index,
1438     node_index);
1439 }
1440 #endif
1441
1442 /*
1443  * fd.io coding-style-patch-verification: ON
1444  *
1445  * Local Variables:
1446  * eval: (c-set-style "gnu")
1447  * End:
1448  */