src/vnet/ip/reass/ip6_full_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 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv6 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/bihash_48_8.h>
  27 #include <vnet/ip/reass/ip6_full_reass.h>
  28 #include <vnet/ip/ip6_inlines.h>
  29
  30 #define MSEC_PER_SEC 1000
  31 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 200
  32 /* As there are only 1024 reass context per thread, either the DDOS attacks
  33  * or fractions of real timeouts, would consume these contexts quickly and
  34  * running out context space and unable to perform reassembly */
  35 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 50 // 50 ms default
  36 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  37 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  38 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  39
  40 typedef enum
  41 {
  42   IP6_FULL_REASS_RC_OK,
  43   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  44   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  45   IP6_FULL_REASS_RC_NO_BUF,
  46   IP6_FULL_REASS_RC_HANDOFF,
  47   IP6_FULL_REASS_RC_INVALID_FRAG_LEN,
  48   IP6_FULL_REASS_RC_OVERLAP,
  49 } ip6_full_reass_rc_t;
  50
  51 typedef struct
  52 {
  53   union
  54   {
  55     struct
  56     {
  57       ip6_address_t src;
  58       ip6_address_t dst;
  59       u32 xx_id;
  60       u32 frag_id;
  61       u8 unused[7];
  62       u8 proto;
  63     };
  64     u64 as_u64[6];
  65   };
  66 } ip6_full_reass_key_t;
  67
  68 typedef union
  69 {
  70   struct
  71   {
  72     u32 reass_index;
  73     u32 memory_owner_thread_index;
  74   };
  75   u64 as_u64;
  76 } ip6_full_reass_val_t;
  77
  78 typedef union
  79 {
  80   struct
  81   {
  82     ip6_full_reass_key_t k;
  83     ip6_full_reass_val_t v;
  84   };
  85   clib_bihash_kv_48_8_t kv;
  86 } ip6_full_reass_kv_t;
  87
  88
  89 always_inline u32
  90 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  91 {
  92   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  93   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  94 }
  95
  96 always_inline u16
  97 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  98 {
  99   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 100   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 101     (vnb->ip.reass.fragment_first +
 102      ip6_full_reass_buffer_get_data_offset (b)) + 1;
 103 }
 104
 105 typedef struct
 106 {
 107   // hash table key
 108   ip6_full_reass_key_t key;
 109   // time when last packet was received
 110   f64 last_heard;
 111   // internal id of this reassembly
 112   u64 id;
 113   // buffer index of first buffer in this reassembly context
 114   u32 first_bi;
 115   // last octet of packet, ~0 until fragment without more_fragments arrives
 116   u32 last_packet_octet;
 117   // length of data collected so far
 118   u32 data_len;
 119   // trace operation counter
 120   u32 trace_op_counter;
 121   // next index - used by custom apps (~0 if not set)
 122   u32 next_index;
 123   // error next index - used by custom apps (~0 if not set)
 124   u32 error_next_index;
 125   // minimum fragment length for this reassembly - used to estimate MTU
 126   u16 min_fragment_length;
 127   // number of fragments for this reassembly
 128   u32 fragments_n;
 129   // thread owning memory for this context (whose pool contains this ctx)
 130   u32 memory_owner_thread_index;
 131   // thread which received fragment with offset 0 and which sends out the
 132   // completed reassembly
 133   u32 sendout_thread_index;
 134 } ip6_full_reass_t;
 135
 136 typedef struct
 137 {
 138   ip6_full_reass_t *pool;
 139   u32 reass_n;
 140   u32 id_counter;
 141   // for pacing the main thread timeouts
 142   u32 last_id;
 143   clib_spinlock_t lock;
 144 } ip6_full_reass_per_thread_t;
 145
 146 typedef struct
 147 {
 148   // IPv6 config
 149   u32 timeout_ms;
 150   f64 timeout;
 151   u32 expire_walk_interval_ms;
 152   // maximum number of fragments in one reassembly
 153   u32 max_reass_len;
 154   // maximum number of reassemblies
 155   u32 max_reass_n;
 156
 157   // IPv6 runtime
 158   clib_bihash_48_8_t hash;
 159
 160   // per-thread data
 161   ip6_full_reass_per_thread_t *per_thread_data;
 162
 163   // convenience
 164   vlib_main_t *vlib_main;
 165
 166   u32 ip6_icmp_error_idx;
 167   u32 ip6_full_reass_expire_node_idx;
 168
 169   /** Worker handoff */
 170   u32 fq_index;
 171   u32 fq_local_index;
 172   u32 fq_feature_index;
 173   u32 fq_custom_index;
 174
 175   // reference count for enabling/disabling feature - per interface
 176   u32 *feature_use_refcount_per_intf;
 177
 178   // whether local fragmented packets are reassembled or not
 179   int is_local_reass_enabled;
 180 } ip6_full_reass_main_t;
 181
 182 extern ip6_full_reass_main_t ip6_full_reass_main;
 183
 184 #ifndef CLIB_MARCH_VARIANT
 185 ip6_full_reass_main_t ip6_full_reass_main;
 186 #endif /* CLIB_MARCH_VARIANT */
 187
 188 typedef enum
 189 {
 190   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 191   IP6_FULL_REASSEMBLY_NEXT_DROP,
 192   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 193   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 194   IP6_FULL_REASSEMBLY_N_NEXT,
 195 } ip6_full_reass_next_t;
 196
 197 typedef enum
 198 {
 199   NORMAL,
 200   FEATURE,
 201   CUSTOM
 202 } ip6_full_reass_node_type_t;
 203
 204 typedef enum
 205 {
 206   RANGE_NEW,
 207   RANGE_OVERLAP,
 208   ICMP_ERROR_RT_EXCEEDED,
 209   ICMP_ERROR_FL_TOO_BIG,
 210   ICMP_ERROR_FL_NOT_MULT_8,
 211   FINALIZE,
 212   HANDOFF,
 213   PASSTHROUGH,
 214 } ip6_full_reass_trace_operation_e;
 215
 216 typedef struct
 217 {
 218   u16 range_first;
 219   u16 range_last;
 220   u32 range_bi;
 221   i32 data_offset;
 222   u32 data_len;
 223   u32 first_bi;
 224 } ip6_full_reass_range_trace_t;
 225
 226 typedef struct
 227 {
 228   ip6_full_reass_trace_operation_e action;
 229   u32 reass_id;
 230   ip6_full_reass_range_trace_t trace_range;
 231   u32 op_id;
 232   u32 fragment_first;
 233   u32 fragment_last;
 234   u32 total_data_len;
 235   u32 thread_id;
 236   u32 thread_id_to;
 237   bool is_after_handoff;
 238   ip6_header_t ip6_header;
 239   ip6_frag_hdr_t ip6_frag_header;
 240 } ip6_full_reass_trace_t;
 241
 242 static void
 243 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 244                               ip6_full_reass_range_trace_t * trace)
 245 {
 246   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 247   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 248   trace->range_first = vnb->ip.reass.range_first;
 249   trace->range_last = vnb->ip.reass.range_last;
 250   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 251   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 252   trace->range_bi = bi;
 253 }
 254
 255 static u8 *
 256 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 257 {
 258   ip6_full_reass_range_trace_t *trace =
 259     va_arg (*args, ip6_full_reass_range_trace_t *);
 260   s =
 261     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 262             trace->range_last, trace->data_offset, trace->data_len,
 263             trace->range_bi);
 264   return s;
 265 }
 266
 267 static u8 *
 268 format_ip6_full_reass_trace (u8 * s, va_list * args)
 269 {
 270   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 271   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 272   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 273   u32 indent = 0;
 274   if (~0 != t->reass_id)
 275     {
 276       if (t->is_after_handoff)
 277         {
 278           s =
 279             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 280                     sizeof (t->ip6_header));
 281           s =
 282             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 283                     sizeof (t->ip6_frag_header));
 284           indent = 2;
 285         }
 286       s =
 287         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 288                 t->reass_id, t->op_id);
 289       indent = format_get_indent (s);
 290       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 291                   t->trace_range.first_bi, t->total_data_len,
 292                   t->fragment_first, t->fragment_last);
 293     }
 294   switch (t->action)
 295     {
 296     case RANGE_NEW:
 297       s = format (s, "\n%Unew %U", format_white_space, indent,
 298                   format_ip6_full_reass_range_trace, &t->trace_range);
 299       break;
 300     case RANGE_OVERLAP:
 301       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 302                   format_ip6_full_reass_range_trace, &t->trace_range);
 303       break;
 304     case ICMP_ERROR_FL_TOO_BIG:
 305       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 306                   format_white_space, indent,
 307                   format_ip6_full_reass_range_trace, &t->trace_range);
 308       break;
 309     case ICMP_ERROR_FL_NOT_MULT_8:
 310       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 311                   format_white_space, indent,
 312                   format_ip6_full_reass_range_trace, &t->trace_range);
 313       break;
 314     case ICMP_ERROR_RT_EXCEEDED:
 315       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 316                   format_white_space, indent);
 317       break;
 318     case FINALIZE:
 319       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 320       break;
 321     case HANDOFF:
 322       s =
 323         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 324                 t->thread_id_to);
 325       break;
 326     case PASSTHROUGH:
 327       s = format (s, "passthrough - not a fragment");
 328       break;
 329     }
 330   return s;
 331 }
 332
 333 static void
 334 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 335                           ip6_full_reass_t * reass, u32 bi,
 336                           ip6_frag_hdr_t * ip6_frag_header,
 337                           ip6_full_reass_trace_operation_e action,
 338                           u32 thread_id_to)
 339 {
 340   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 341   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 342   bool is_after_handoff = false;
 343   if (pool_is_free_index
 344       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 345     {
 346       // this buffer's trace is gone
 347       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 348       return;
 349     }
 350   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 351     {
 352       is_after_handoff = true;
 353     }
 354   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 355   t->is_after_handoff = is_after_handoff;
 356   if (t->is_after_handoff)
 357     {
 358       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 359                    clib_min (sizeof (t->ip6_header), b->current_length));
 360       if (ip6_frag_header)
 361         {
 362           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 363                        sizeof (t->ip6_frag_header));
 364         }
 365       else
 366         {
 367           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 368         }
 369     }
 370   if (reass)
 371     {
 372       t->reass_id = reass->id;
 373       t->op_id = reass->trace_op_counter;
 374       t->trace_range.first_bi = reass->first_bi;
 375       t->total_data_len = reass->data_len;
 376       ++reass->trace_op_counter;
 377     }
 378   else
 379     {
 380       t->reass_id = ~0;
 381     }
 382   t->action = action;
 383   t->thread_id = vm->thread_index;
 384   t->thread_id_to = thread_id_to;
 385   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 386   t->fragment_first = vnb->ip.reass.fragment_first;
 387   t->fragment_last = vnb->ip.reass.fragment_last;
 388 #if 0
 389   static u8 *s = NULL;
 390   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 391   printf ("%.*s\n", vec_len (s), s);
 392   fflush (stdout);
 393   vec_reset_length (s);
 394 #endif
 395 }
 396
 397 always_inline void
 398 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 399                          ip6_full_reass_t * reass)
 400 {
 401   pool_put (rt->pool, reass);
 402   --rt->reass_n;
 403 }
 404
 405 always_inline void
 406 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 407                      ip6_full_reass_per_thread_t * rt,
 408                      ip6_full_reass_t * reass)
 409 {
 410   clib_bihash_kv_48_8_t kv;
 411   kv.key[0] = reass->key.as_u64[0];
 412   kv.key[1] = reass->key.as_u64[1];
 413   kv.key[2] = reass->key.as_u64[2];
 414   kv.key[3] = reass->key.as_u64[3];
 415   kv.key[4] = reass->key.as_u64[4];
 416   kv.key[5] = reass->key.as_u64[5];
 417   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 418   ip6_full_reass_free_ctx (rt, reass);
 419 }
 420
 421 always_inline void
 422 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 423                          ip6_full_reass_t *reass, u32 offending_bi)
 424 {
 425   u32 range_bi = reass->first_bi;
 426   vlib_buffer_t *range_b;
 427   vnet_buffer_opaque_t *range_vnb;
 428   u32 *to_free = NULL;
 429   while (~0 != range_bi)
 430     {
 431       range_b = vlib_get_buffer (vm, range_bi);
 432       range_vnb = vnet_buffer (range_b);
 433       u32 bi = range_bi;
 434       while (~0 != bi)
 435         {
 436           vec_add1 (to_free, bi);
 437           if (bi == offending_bi)
 438             {
 439               offending_bi = ~0;
 440             }
 441           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 442           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 443             {
 444               bi = b->next_buffer;
 445               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 446             }
 447           else
 448             {
 449               bi = ~0;
 450             }
 451         }
 452       range_bi = range_vnb->ip.reass.next_range_bi;
 453     }
 454   if (~0 != offending_bi)
 455     {
 456       vec_add1 (to_free, offending_bi);
 457     }
 458   /* send to next_error_index */
 459   if (~0 != reass->error_next_index)
 460     {
 461       u32 n_left_to_next, *to_next, next_index;
 462
 463       next_index = reass->error_next_index;
 464       u32 bi = ~0;
 465
 466       while (vec_len (to_free) > 0)
 467         {
 468           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 469
 470           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 471             {
 472               bi = vec_pop (to_free);
 473
 474               if (~0 != bi)
 475                 {
 476                   to_next[0] = bi;
 477                   to_next += 1;
 478                   n_left_to_next -= 1;
 479                 }
 480             }
 481           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 482         }
 483     }
 484   else
 485     {
 486       vlib_buffer_free (vm, to_free, vec_len (to_free));
 487     }
 488   vec_free (to_free);
 489 }
 490
 491 always_inline void
 492 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 493                            ip6_full_reass_t * reass, u32 * icmp_bi)
 494 {
 495   if (~0 == reass->first_bi)
 496     {
 497       return;
 498     }
 499   if (~0 == reass->next_index)  // custom apps don't want icmp
 500     {
 501       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 502       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 503         {
 504           *icmp_bi = reass->first_bi;
 505           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 506             {
 507               ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 508                                         ICMP_ERROR_RT_EXCEEDED, ~0);
 509             }
 510           // fragment with offset zero received - send icmp message back
 511           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 512             {
 513               // separate first buffer from chain and steer it towards icmp node
 514               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 515               reass->first_bi = b->next_buffer;
 516             }
 517           else
 518             {
 519               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 520             }
 521           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 522                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 523                                        0);
 524         }
 525     }
 526   ip6_full_reass_drop_all (vm, node, reass, ~0);
 527 }
 528
 529 always_inline ip6_full_reass_t *
 530 ip6_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
 531                                ip6_full_reass_main_t *rm,
 532                                ip6_full_reass_per_thread_t *rt,
 533                                ip6_full_reass_kv_t *kv, u32 *icmp_bi,
 534                                u8 *do_handoff, int skip_bihash)
 535 {
 536   ip6_full_reass_t *reass;
 537   f64 now;
 538
 539 again:
 540
 541   reass = NULL;
 542   now = vlib_time_now (vm);
 543
 544   if (!skip_bihash && !clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 545     {
 546       if (vm->thread_index != kv->v.memory_owner_thread_index)
 547         {
 548           *do_handoff = 1;
 549           return NULL;
 550         }
 551
 552       reass =
 553         pool_elt_at_index (rm->per_thread_data
 554                            [kv->v.memory_owner_thread_index].pool,
 555                            kv->v.reass_index);
 556
 557       if (now > reass->last_heard + rm->timeout)
 558         {
 559           ip6_full_reass_on_timeout (vm, node, reass, icmp_bi);
 560           ip6_full_reass_free (rm, rt, reass);
 561           reass = NULL;
 562         }
 563     }
 564
 565   if (reass)
 566     {
 567       reass->last_heard = now;
 568       return reass;
 569     }
 570
 571   if (rt->reass_n >= rm->max_reass_n)
 572     {
 573       reass = NULL;
 574       return reass;
 575     }
 576   else
 577     {
 578       pool_get (rt->pool, reass);
 579       clib_memset (reass, 0, sizeof (*reass));
 580       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 581       ++rt->id_counter;
 582       reass->first_bi = ~0;
 583       reass->last_packet_octet = ~0;
 584       reass->data_len = 0;
 585       reass->next_index = ~0;
 586       reass->error_next_index = ~0;
 587       reass->memory_owner_thread_index = vm->thread_index;
 588       ++rt->reass_n;
 589     }
 590
 591   kv->v.reass_index = (reass - rt->pool);
 592   kv->v.memory_owner_thread_index = vm->thread_index;
 593   reass->last_heard = now;
 594
 595   if (!skip_bihash)
 596     {
 597       reass->key.as_u64[0] = kv->kv.key[0];
 598       reass->key.as_u64[1] = kv->kv.key[1];
 599       reass->key.as_u64[2] = kv->kv.key[2];
 600       reass->key.as_u64[3] = kv->kv.key[3];
 601       reass->key.as_u64[4] = kv->kv.key[4];
 602       reass->key.as_u64[5] = kv->kv.key[5];
 603
 604       int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 605       if (rv)
 606         {
 607           ip6_full_reass_free (rm, rt, reass);
 608           reass = NULL;
 609           // if other worker created a context already work with the other copy
 610           if (-2 == rv)
 611             goto again;
 612         }
 613     }
 614   else
 615     {
 616       reass->key.as_u64[0] = ~0;
 617       reass->key.as_u64[1] = ~0;
 618       reass->key.as_u64[2] = ~0;
 619       reass->key.as_u64[3] = ~0;
 620       reass->key.as_u64[4] = ~0;
 621       reass->key.as_u64[5] = ~0;
 622     }
 623
 624   return reass;
 625 }
 626
 627 always_inline ip6_full_reass_rc_t
 628 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 629                          ip6_full_reass_main_t * rm,
 630                          ip6_full_reass_per_thread_t * rt,
 631                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 632                          u32 * error0, bool is_custom_app)
 633 {
 634   *bi0 = reass->first_bi;
 635   *error0 = IP6_ERROR_NONE;
 636   ip6_frag_hdr_t *frag_hdr;
 637   vlib_buffer_t *last_b = NULL;
 638   u32 sub_chain_bi = reass->first_bi;
 639   u32 total_length = 0;
 640   u32 buf_cnt = 0;
 641   u32 dropped_cnt = 0;
 642   u32 *vec_drop_compress = NULL;
 643   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 644   do
 645     {
 646       u32 tmp_bi = sub_chain_bi;
 647       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 648       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 649       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 650           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 651         {
 652           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 653           goto free_buffers_and_return;
 654         }
 655
 656       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 657       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 658         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 659       u32 trim_end =
 660         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 661       if (tmp_bi == reass->first_bi)
 662         {
 663           /* first buffer - keep ip6 header */
 664           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 665             {
 666               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 667               goto free_buffers_and_return;
 668             }
 669           trim_front = 0;
 670           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 671             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 672              sizeof (*frag_hdr));
 673           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 674             {
 675               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 676               goto free_buffers_and_return;
 677             }
 678         }
 679       u32 keep_data =
 680         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 681       while (1)
 682         {
 683           ++buf_cnt;
 684           if (trim_front)
 685             {
 686               if (trim_front > tmp->current_length)
 687                 {
 688                   /* drop whole buffer */
 689                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 690                     {
 691                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 692                       goto free_buffers_and_return;
 693                     }
 694                   trim_front -= tmp->current_length;
 695                   vec_add1 (vec_drop_compress, tmp_bi);
 696                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 697                   tmp_bi = tmp->next_buffer;
 698                   tmp = vlib_get_buffer (vm, tmp_bi);
 699                   continue;
 700                 }
 701               else
 702                 {
 703                   vlib_buffer_advance (tmp, trim_front);
 704                   trim_front = 0;
 705                 }
 706             }
 707           if (keep_data)
 708             {
 709               if (last_b)
 710                 {
 711                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 712                   last_b->next_buffer = tmp_bi;
 713                 }
 714               last_b = tmp;
 715               if (keep_data <= tmp->current_length)
 716                 {
 717                   tmp->current_length = keep_data;
 718                   keep_data = 0;
 719                 }
 720               else
 721                 {
 722                   keep_data -= tmp->current_length;
 723                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 724                     {
 725                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 726                       goto free_buffers_and_return;
 727                     }
 728                 }
 729               total_length += tmp->current_length;
 730             }
 731           else
 732             {
 733               if (reass->first_bi == tmp_bi)
 734                 {
 735                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 736                   goto free_buffers_and_return;
 737                 }
 738               vec_add1 (vec_drop_compress, tmp_bi);
 739               ++dropped_cnt;
 740             }
 741           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 742             {
 743               tmp_bi = tmp->next_buffer;
 744               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 745             }
 746           else
 747             {
 748               break;
 749             }
 750         }
 751       sub_chain_bi =
 752         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 753         reass.next_range_bi;
 754     }
 755   while (~0 != sub_chain_bi);
 756
 757   if (!last_b)
 758     {
 759       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 760       goto free_buffers_and_return;
 761     }
 762   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 763   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 764   if (total_length < first_b->current_length)
 765     {
 766       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 767       goto free_buffers_and_return;
 768     }
 769   total_length -= first_b->current_length;
 770   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 771   first_b->total_length_not_including_first_buffer = total_length;
 772   // drop fragment header
 773   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 774   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 775   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 776   ip6_ext_hdr_chain_t hdr_chain;
 777   ip6_ext_header_t *prev_hdr = 0;
 778   int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 779                                  &hdr_chain);
 780   if (res < 0 ||
 781       (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
 782     {
 783       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 784       goto free_buffers_and_return;
 785     }
 786   frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
 787   if (res > 0)
 788     {
 789       prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
 790       prev_hdr->next_hdr = frag_hdr->next_hdr;
 791     }
 792   else
 793     {
 794       ip->protocol = frag_hdr->next_hdr;
 795     }
 796   if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
 797     {
 798       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 799       goto free_buffers_and_return;
 800     }
 801   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 802            first_b->current_length - ip6_frag_hdr_offset -
 803            sizeof (ip6_frag_hdr_t));
 804   first_b->current_length -= sizeof (*frag_hdr);
 805   ip->payload_length =
 806     clib_host_to_net_u16 (total_length + first_b->current_length -
 807                           sizeof (*ip));
 808   if (!vlib_buffer_chain_linearize (vm, first_b))
 809     {
 810       rv = IP6_FULL_REASS_RC_NO_BUF;
 811       goto free_buffers_and_return;
 812     }
 813   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 814   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 815     {
 816       ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 817                                 FINALIZE, ~0);
 818 #if 0
 819       // following code does a hexdump of packet fragments to stdout ...
 820       do
 821         {
 822           u32 bi = reass->first_bi;
 823           u8 *s = NULL;
 824           while (~0 != bi)
 825             {
 826               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 827               s = format (s, "%u: %U\n", bi, format_hexdump,
 828                           vlib_buffer_get_current (b), b->current_length);
 829               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 830                 {
 831                   bi = b->next_buffer;
 832                 }
 833               else
 834                 {
 835                   break;
 836                 }
 837             }
 838           printf ("%.*s\n", vec_len (s), s);
 839           fflush (stdout);
 840           vec_free (s);
 841         }
 842       while (0);
 843 #endif
 844     }
 845   if (!is_custom_app)
 846     {
 847       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 848     }
 849   else
 850     {
 851       *next0 = reass->next_index;
 852     }
 853   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 854   ip6_full_reass_free (rm, rt, reass);
 855   reass = NULL;
 856 free_buffers_and_return:
 857   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 858   vec_free (vec_drop_compress);
 859   return rv;
 860 }
 861
 862 always_inline void
 863 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 864                                       ip6_full_reass_t * reass,
 865                                       u32 prev_range_bi, u32 new_next_bi)
 866 {
 867
 868   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 869   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 870   if (~0 != prev_range_bi)
 871     {
 872       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 873       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 874       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 875       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 876     }
 877   else
 878     {
 879       if (~0 != reass->first_bi)
 880         {
 881           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 882         }
 883       reass->first_bi = new_next_bi;
 884     }
 885   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 886 }
 887
 888 always_inline ip6_full_reass_rc_t
 889 ip6_full_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
 890                        ip6_full_reass_main_t *rm,
 891                        ip6_full_reass_per_thread_t *rt,
 892                        ip6_full_reass_t *reass, u32 *bi0, u32 *next0,
 893                        u32 *error0, ip6_frag_hdr_t *frag_hdr,
 894                        bool is_custom_app, u32 *handoff_thread_idx,
 895                        int skip_bihash)
 896 {
 897   int consumed = 0;
 898   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 899   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 900   if (is_custom_app)
 901     {
 902       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 903       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 904     }
 905
 906   fvnb->ip.reass.ip6_frag_hdr_offset =
 907     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 908   ip6_header_t *fip = vlib_buffer_get_current (fb);
 909   if (fb->current_length < sizeof (*fip) ||
 910       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 911       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 912     {
 913       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 914     }
 915
 916   u32 fragment_first = fvnb->ip.reass.fragment_first =
 917     ip6_frag_hdr_offset_bytes (frag_hdr);
 918   u32 fragment_length =
 919     vlib_buffer_length_in_chain (vm, fb) -
 920     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 921   if (0 == fragment_length)
 922     {
 923       return IP6_FULL_REASS_RC_INVALID_FRAG_LEN;
 924     }
 925   u32 fragment_last = fvnb->ip.reass.fragment_last =
 926     fragment_first + fragment_length - 1;
 927   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 928   u32 candidate_range_bi = reass->first_bi;
 929   u32 prev_range_bi = ~0;
 930   fvnb->ip.reass.range_first = fragment_first;
 931   fvnb->ip.reass.range_last = fragment_last;
 932   fvnb->ip.reass.next_range_bi = ~0;
 933   if (!more_fragments)
 934     {
 935       reass->last_packet_octet = fragment_last;
 936     }
 937   if (~0 == reass->first_bi)
 938     {
 939       // starting a new reassembly
 940       ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 941       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 942       consumed = 1;
 943       reass->fragments_n = 1;
 944       goto check_if_done_maybe;
 945     }
 946   reass->min_fragment_length =
 947     clib_min (clib_net_to_host_u16 (fip->payload_length),
 948               fvnb->ip.reass.estimated_mtu);
 949   while (~0 != candidate_range_bi)
 950     {
 951       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 952       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 953       if (fragment_first > candidate_vnb->ip.reass.range_last)
 954         {
 955           // this fragments starts after candidate range
 956           prev_range_bi = candidate_range_bi;
 957           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 958           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 959               ~0 == candidate_range_bi)
 960             {
 961               // special case - this fragment falls beyond all known ranges
 962               ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 963                                                     *bi0);
 964               consumed = 1;
 965               break;
 966             }
 967           continue;
 968         }
 969       if (fragment_last < candidate_vnb->ip.reass.range_first)
 970         {
 971           // this fragment ends before candidate range without any overlap
 972           ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 973                                                 *bi0);
 974           consumed = 1;
 975         }
 976       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 977                fragment_last == candidate_vnb->ip.reass.range_last)
 978         {
 979           // duplicate fragment - ignore
 980         }
 981       else
 982         {
 983           // overlapping fragment - not allowed by RFC 8200
 984           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 985             {
 986               ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
 987                                         RANGE_OVERLAP, ~0);
 988             }
 989           return IP6_FULL_REASS_RC_OVERLAP;
 990         }
 991       break;
 992     }
 993   ++reass->fragments_n;
 994 check_if_done_maybe:
 995   if (consumed)
 996     {
 997       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 998         {
 999           ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
1000                                     ~0);
1001         }
1002     }
1003   else if (skip_bihash)
1004     {
1005       // if this reassembly is not in bihash, then the packet must have been
1006       // consumed
1007       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1008     }
1009   if (~0 != reass->last_packet_octet &&
1010       reass->data_len == reass->last_packet_octet + 1)
1011     {
1012       *handoff_thread_idx = reass->sendout_thread_index;
1013       int handoff =
1014         reass->memory_owner_thread_index != reass->sendout_thread_index;
1015       ip6_full_reass_rc_t rc =
1016         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1017                                  is_custom_app);
1018       if (IP6_FULL_REASS_RC_OK == rc && handoff)
1019         {
1020           return IP6_FULL_REASS_RC_HANDOFF;
1021         }
1022       return rc;
1023     }
1024   else
1025     {
1026       if (skip_bihash)
1027         {
1028           // if this reassembly is not in bihash, it should've been an atomic
1029           // fragment and thus finalized
1030           return IP6_FULL_REASS_RC_INTERNAL_ERROR;
1031         }
1032       if (consumed)
1033         {
1034           *bi0 = ~0;
1035           if (reass->fragments_n > rm->max_reass_len)
1036             {
1037               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
1038             }
1039         }
1040       else
1041         {
1042           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1043           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
1044         }
1045     }
1046   return IP6_FULL_REASS_RC_OK;
1047 }
1048
1049 always_inline bool
1050 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
1051                                            vlib_buffer_t *b,
1052                                            ip6_ext_hdr_chain_t *hc)
1053 {
1054   int nh = hc->eh[hc->length - 1].protocol;
1055   /* Checking to see if it's a terminating header */
1056   if (ip6_ext_hdr (nh))
1057     {
1058       icmp6_error_set_vnet_buffer (
1059         b, ICMP6_parameter_problem,
1060         ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, 0);
1061       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1062       return false;
1063     }
1064   return true;
1065 }
1066
1067 always_inline bool
1068 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1069                                            vlib_buffer_t * b,
1070                                            ip6_frag_hdr_t * frag_hdr)
1071 {
1072   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1073   ip6_header_t *ip = vlib_buffer_get_current (b);
1074   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1075   u32 fragment_length =
1076     vlib_buffer_length_in_chain (vm, b) -
1077     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1078   if (more_fragments && 0 != fragment_length % 8)
1079     {
1080       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1081                                    ICMP6_parameter_problem_erroneous_header_field,
1082                                    (u8 *) & ip->payload_length - (u8 *) ip);
1083       return false;
1084     }
1085   return true;
1086 }
1087
1088 always_inline bool
1089 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1090                                           vlib_buffer_t * b,
1091                                           ip6_frag_hdr_t * frag_hdr)
1092 {
1093   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1094   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1095   u32 fragment_length =
1096     vlib_buffer_length_in_chain (vm, b) -
1097     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1098   if (fragment_first + fragment_length > 65535)
1099     {
1100       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1101       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1102                                    ICMP6_parameter_problem_erroneous_header_field,
1103                                    (u8 *) & frag_hdr->fragment_offset_and_more
1104                                    - (u8 *) ip0);
1105       return false;
1106     }
1107   return true;
1108 }
1109
1110 always_inline uword
1111 ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1112                             vlib_frame_t *frame, bool is_feature,
1113                             bool is_custom_app, bool is_local)
1114 {
1115   u32 *from = vlib_frame_vector_args (frame);
1116   u32 n_left_from, n_left_to_next, *to_next, next_index;
1117   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1118   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1119   clib_spinlock_lock (&rt->lock);
1120
1121   n_left_from = frame->n_vectors;
1122   next_index = node->cached_next_index;
1123   while (n_left_from > 0)
1124     {
1125       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1126
1127       while (n_left_from > 0 && n_left_to_next > 0)
1128         {
1129           u32 bi0;
1130           vlib_buffer_t *b0;
1131           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1132           u32 error0 = IP6_ERROR_NONE;
1133           u32 icmp_bi = ~0;
1134
1135           bi0 = from[0];
1136           b0 = vlib_get_buffer (vm, bi0);
1137
1138           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1139           ip6_frag_hdr_t *frag_hdr;
1140           ip6_ext_hdr_chain_t hdr_chain;
1141           int res = ip6_ext_header_walk (
1142             b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
1143           if (res < 0 ||
1144               hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
1145             {
1146               // this is a mangled packet - no fragmentation
1147               next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1148               ip6_full_reass_add_trace (vm, node, NULL, bi0, NULL, PASSTHROUGH,
1149                                         ~0);
1150               goto skip_reass;
1151             }
1152           if (is_local && !rm->is_local_reass_enabled)
1153             {
1154               next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1155               goto skip_reass;
1156             }
1157           frag_hdr =
1158             ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
1159           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1160             hdr_chain.eh[res].offset;
1161
1162           if (0 == ip6_frag_hdr_offset (frag_hdr))
1163             {
1164               // first fragment - verify upper-layer is present
1165               if (!ip6_full_reass_verify_upper_layer_present (node, b0,
1166                                                               &hdr_chain))
1167                 {
1168                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1169                   goto skip_reass;
1170                 }
1171             }
1172           if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1173               !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
1174             {
1175               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1176               goto skip_reass;
1177             }
1178
1179           int skip_bihash = 0;
1180           ip6_full_reass_kv_t kv;
1181           u8 do_handoff = 0;
1182
1183           if (0 == ip6_frag_hdr_offset (frag_hdr) &&
1184               !ip6_frag_hdr_more (frag_hdr))
1185             {
1186               // this is atomic fragment and needs to be processed separately
1187               skip_bihash = 1;
1188             }
1189           else
1190             {
1191               kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1192               kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1193               kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1194               kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1195               kv.k.as_u64[4] =
1196                 ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1197                                 vnet_buffer (b0)->sw_if_index[VLIB_RX]))
1198                   << 32 |
1199                 (u64) frag_hdr->identification;
1200               kv.k.as_u64[5] = ip0->protocol;
1201             }
1202
1203           ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
1204             vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash);
1205
1206           if (reass)
1207             {
1208               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1209               if (0 == fragment_first)
1210                 {
1211                   reass->sendout_thread_index = vm->thread_index;
1212                 }
1213             }
1214           if (PREDICT_FALSE (do_handoff))
1215             {
1216               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1217               vnet_buffer (b0)->ip.reass.owner_thread_index =
1218                 kv.v.memory_owner_thread_index;
1219             }
1220           else if (reass)
1221             {
1222               u32 handoff_thread_idx;
1223               u32 counter = ~0;
1224               switch (ip6_full_reass_update (
1225                 vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
1226                 is_custom_app, &handoff_thread_idx, skip_bihash))
1227                 {
1228                 case IP6_FULL_REASS_RC_OK:
1229                   /* nothing to do here */
1230                   break;
1231                 case IP6_FULL_REASS_RC_HANDOFF:
1232                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1233                   b0 = vlib_get_buffer (vm, bi0);
1234                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1235                     handoff_thread_idx;
1236                   break;
1237                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1238                   counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1239                   break;
1240                 case IP6_FULL_REASS_RC_NO_BUF:
1241                   counter = IP6_ERROR_REASS_NO_BUF;
1242                   break;
1243                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1244                   counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1245                   break;
1246                 case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
1247                   counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
1248                   break;
1249                 case IP6_FULL_REASS_RC_OVERLAP:
1250                   counter = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
1251                   break;
1252                 }
1253               if (~0 != counter)
1254                 {
1255                   vlib_node_increment_counter (vm, node->node_index, counter,
1256                                                1);
1257                   ip6_full_reass_drop_all (vm, node, reass, bi0);
1258                   ip6_full_reass_free (rm, rt, reass);
1259                   goto next_packet;
1260                   break;
1261                 }
1262             }
1263           else
1264             {
1265               if (is_feature)
1266                 {
1267                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1268                 }
1269               else
1270                 {
1271                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1272                   next0 = fvnb->ip.reass.error_next_index;
1273                 }
1274               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1275             }
1276
1277           if (~0 != bi0)
1278             {
1279             skip_reass:
1280               to_next[0] = bi0;
1281               to_next += 1;
1282               n_left_to_next -= 1;
1283
1284               /* bi0 might have been updated by reass_finalize, reload */
1285               b0 = vlib_get_buffer (vm, bi0);
1286               if (IP6_ERROR_NONE != error0)
1287                 {
1288                   b0->error = node->errors[error0];
1289                 }
1290
1291               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1292                 {
1293                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1294                     {
1295                       ip6_full_reass_add_trace (
1296                         vm, node, NULL, bi0, frag_hdr, HANDOFF,
1297                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1298                     }
1299                 }
1300               else if (is_feature && IP6_ERROR_NONE == error0)
1301                 {
1302                   vnet_feature_next (&next0, b0);
1303                 }
1304               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1305                                                n_left_to_next, bi0, next0);
1306             }
1307
1308           if (~0 != icmp_bi)
1309             {
1310               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1311               to_next[0] = icmp_bi;
1312               to_next += 1;
1313               n_left_to_next -= 1;
1314               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1315                                                n_left_to_next, icmp_bi,
1316                                                next0);
1317             }
1318         next_packet:
1319           from += 1;
1320           n_left_from -= 1;
1321         }
1322
1323       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1324     }
1325
1326   clib_spinlock_unlock (&rt->lock);
1327   return frame->n_vectors;
1328 }
1329
1330 static char *ip6_full_reassembly_error_strings[] = {
1331 #define _(sym, string) string,
1332   foreach_ip6_error
1333 #undef _
1334 };
1335
1336 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1337                                     vlib_node_runtime_t * node,
1338                                     vlib_frame_t * frame)
1339 {
1340   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1341                                      false /* is_custom_app */,
1342                                      false /* is_local */);
1343 }
1344
1345 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1346     .name = "ip6-full-reassembly",
1347     .vector_size = sizeof (u32),
1348     .format_trace = format_ip6_full_reass_trace,
1349     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1350     .error_strings = ip6_full_reassembly_error_strings,
1351     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1352     .next_nodes =
1353         {
1354                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1355                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1356                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1357                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1358         },
1359 };
1360
1361 VLIB_NODE_FN (ip6_local_full_reass_node)
1362 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1363 {
1364   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1365                                      false /* is_custom_app */,
1366                                      true /* is_local */);
1367 }
1368
1369 VLIB_REGISTER_NODE (ip6_local_full_reass_node) = {
1370     .name = "ip6-local-full-reassembly",
1371     .vector_size = sizeof (u32),
1372     .format_trace = format_ip6_full_reass_trace,
1373     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1374     .error_strings = ip6_full_reassembly_error_strings,
1375     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1376     .next_nodes =
1377         {
1378                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1379                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1380                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1381                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-local-full-reassembly-handoff",
1382         },
1383 };
1384
1385 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1386                                             vlib_node_runtime_t * node,
1387                                             vlib_frame_t * frame)
1388 {
1389   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */,
1390                                      false /* is_custom_app */,
1391                                      false /* is_local */);
1392 }
1393
1394 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1395     .name = "ip6-full-reassembly-feature",
1396     .vector_size = sizeof (u32),
1397     .format_trace = format_ip6_full_reass_trace,
1398     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1399     .error_strings = ip6_full_reassembly_error_strings,
1400     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1401     .next_nodes =
1402         {
1403                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1404                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1405                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1406                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1407         },
1408 };
1409
1410 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1411     .arc_name = "ip6-unicast",
1412     .node_name = "ip6-full-reassembly-feature",
1413     .runs_before = VNET_FEATURES ("ip6-lookup",
1414                                   "ipsec6-input-feature"),
1415     .runs_after = 0,
1416 };
1417
1418 VLIB_NODE_FN (ip6_full_reass_node_custom)
1419 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1420 {
1421   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
1422                                      true /* is_custom_app */,
1423                                      false /* is_local */);
1424 }
1425
1426 VLIB_REGISTER_NODE (ip6_full_reass_node_custom) = {
1427     .name = "ip6-full-reassembly-custom",
1428     .vector_size = sizeof (u32),
1429     .format_trace = format_ip6_full_reass_trace,
1430     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1431     .error_strings = ip6_full_reassembly_error_strings,
1432     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1433     .next_nodes =
1434         {
1435                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1436                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1437                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1438                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-custom-hoff",
1439         },
1440 };
1441
1442 #ifndef CLIB_MARCH_VARIANT
1443 static u32
1444 ip6_full_reass_get_nbuckets ()
1445 {
1446   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1447   u32 nbuckets;
1448   u8 i;
1449
1450   /* need more mem with more workers */
1451   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1452                     IP6_FULL_REASS_HT_LOAD_FACTOR);
1453
1454   for (i = 0; i < 31; i++)
1455     if ((1 << i) >= nbuckets)
1456       break;
1457   nbuckets = 1 << i;
1458
1459   return nbuckets;
1460 }
1461 #endif /* CLIB_MARCH_VARIANT */
1462
1463 typedef enum
1464 {
1465   IP6_EVENT_CONFIG_CHANGED = 1,
1466 } ip6_full_reass_event_t;
1467
1468 #ifndef CLIB_MARCH_VARIANT
1469 typedef struct
1470 {
1471   int failure;
1472   clib_bihash_48_8_t *new_hash;
1473 } ip6_rehash_cb_ctx;
1474
1475 static int
1476 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1477 {
1478   ip6_rehash_cb_ctx *ctx = _ctx;
1479   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1480     {
1481       ctx->failure = 1;
1482     }
1483   return (BIHASH_WALK_CONTINUE);
1484 }
1485
1486 static void
1487 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1488                            u32 max_reassembly_length,
1489                            u32 expire_walk_interval_ms)
1490 {
1491   ip6_full_reass_main.timeout_ms = timeout_ms;
1492   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1493   ip6_full_reass_main.max_reass_n = max_reassemblies;
1494   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1495   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1496 }
1497
1498 vnet_api_error_t
1499 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1500                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1501 {
1502   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1503   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1504                              max_reassembly_length, expire_walk_interval_ms);
1505   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1506                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1507                              IP6_EVENT_CONFIG_CHANGED, 0);
1508   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1509   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1510     {
1511       clib_bihash_48_8_t new_hash;
1512       clib_memset (&new_hash, 0, sizeof (new_hash));
1513       ip6_rehash_cb_ctx ctx;
1514       ctx.failure = 0;
1515       ctx.new_hash = &new_hash;
1516       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1517                              new_nbuckets * 1024);
1518       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1519                                                ip6_rehash_cb, &ctx);
1520       if (ctx.failure)
1521         {
1522           clib_bihash_free_48_8 (&new_hash);
1523           return -1;
1524         }
1525       else
1526         {
1527           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1528           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1529                             sizeof (ip6_full_reass_main.hash));
1530           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1531         }
1532     }
1533   return 0;
1534 }
1535
1536 vnet_api_error_t
1537 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1538                     u32 * max_reassembly_length,
1539                     u32 * expire_walk_interval_ms)
1540 {
1541   *timeout_ms = ip6_full_reass_main.timeout_ms;
1542   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1543   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1544   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1545   return 0;
1546 }
1547
1548 static clib_error_t *
1549 ip6_full_reass_init_function (vlib_main_t * vm)
1550 {
1551   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1552   clib_error_t *error = 0;
1553   u32 nbuckets;
1554   vlib_node_t *node;
1555
1556   rm->vlib_main = vm;
1557
1558   vec_validate (rm->per_thread_data, vlib_num_workers ());
1559   ip6_full_reass_per_thread_t *rt;
1560   vec_foreach (rt, rm->per_thread_data)
1561   {
1562     clib_spinlock_init (&rt->lock);
1563     pool_alloc (rt->pool, rm->max_reass_n);
1564   }
1565
1566   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1567   ASSERT (node);
1568   rm->ip6_full_reass_expire_node_idx = node->index;
1569
1570   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1571                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1572                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1573                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1574
1575   nbuckets = ip6_full_reass_get_nbuckets ();
1576   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1577                          nbuckets * 1024);
1578
1579   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1580   ASSERT (node);
1581   rm->ip6_icmp_error_idx = node->index;
1582
1583   if ((error = vlib_call_init_function (vm, ip_main_init)))
1584     return error;
1585   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1586                          ip6_local_full_reass_node.index);
1587   rm->is_local_reass_enabled = 1;
1588
1589   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1590   rm->fq_local_index =
1591     vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0);
1592   rm->fq_feature_index =
1593     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1594   rm->fq_custom_index =
1595     vlib_frame_queue_main_init (ip6_full_reass_node_custom.index, 0);
1596
1597   rm->feature_use_refcount_per_intf = NULL;
1598   return error;
1599 }
1600
1601 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1602 #endif /* CLIB_MARCH_VARIANT */
1603
1604 static uword
1605 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1606                              CLIB_UNUSED (vlib_frame_t *f))
1607 {
1608   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1609   uword event_type, *event_data = 0;
1610
1611   while (true)
1612     {
1613       vlib_process_wait_for_event_or_clock (vm,
1614                                             (f64) rm->expire_walk_interval_ms
1615                                             / (f64) MSEC_PER_SEC);
1616       event_type = vlib_process_get_events (vm, &event_data);
1617
1618       switch (event_type)
1619         {
1620         case ~0:
1621           /* no events => timeout */
1622           /* fallthrough */
1623         case IP6_EVENT_CONFIG_CHANGED:
1624           /* nothing to do here */
1625           break;
1626         default:
1627           clib_warning ("BUG: event type 0x%wx", event_type);
1628           break;
1629         }
1630       f64 now = vlib_time_now (vm);
1631
1632       ip6_full_reass_t *reass;
1633       int *pool_indexes_to_free = NULL;
1634
1635       uword thread_index = 0;
1636       int index;
1637       const uword nthreads = vlib_num_workers () + 1;
1638       u32 *vec_icmp_bi = NULL;
1639       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1640         {
1641           ip6_full_reass_per_thread_t *rt =
1642             &rm->per_thread_data[thread_index];
1643           clib_spinlock_lock (&rt->lock);
1644
1645           vec_reset_length (pool_indexes_to_free);
1646           /* Pace the number of timeouts handled per thread,to avoid barrier
1647            * sync issues in real world scenarios */
1648
1649           u32 beg = rt->last_id;
1650           /* to ensure we walk at least once per sec per context */
1651           u32 end = beg + (IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT *
1652                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS /
1653                              MSEC_PER_SEC +
1654                            1);
1655           if (end > vec_len (rt->pool))
1656             {
1657               end = vec_len (rt->pool);
1658               rt->last_id = 0;
1659             }
1660           else
1661             {
1662               rt->last_id = end;
1663             }
1664
1665           pool_foreach_stepping_index (index, beg, end, rt->pool)
1666           {
1667             reass = pool_elt_at_index (rt->pool, index);
1668             if (now > reass->last_heard + rm->timeout)
1669               {
1670                 vec_add1 (pool_indexes_to_free, index);
1671               }
1672           }
1673
1674           int *i;
1675           vec_foreach (i, pool_indexes_to_free)
1676           {
1677             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1678             u32 icmp_bi = ~0;
1679             ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1680             if (~0 != icmp_bi)
1681               vec_add1 (vec_icmp_bi, icmp_bi);
1682
1683             ip6_full_reass_free (rm, rt, reass);
1684           }
1685
1686           clib_spinlock_unlock (&rt->lock);
1687         }
1688
1689       while (vec_len (vec_icmp_bi) > 0)
1690         {
1691           vlib_frame_t *f =
1692             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1693           u32 *to_next = vlib_frame_vector_args (f);
1694           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1695           int trace_frame = 0;
1696           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1697             {
1698               u32 bi = vec_pop (vec_icmp_bi);
1699               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1700               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1701                 trace_frame = 1;
1702               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1703               to_next[0] = bi;
1704               ++f->n_vectors;
1705               to_next += 1;
1706               n_left_to_next -= 1;
1707             }
1708           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1709           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1710         }
1711
1712       vec_free (pool_indexes_to_free);
1713       vec_free (vec_icmp_bi);
1714       if (event_data)
1715         {
1716           vec_set_len (event_data, 0);
1717         }
1718     }
1719
1720   return 0;
1721 }
1722
1723 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1724     .function = ip6_full_reass_walk_expired,
1725     .format_trace = format_ip6_full_reass_trace,
1726     .type = VLIB_NODE_TYPE_PROCESS,
1727     .name = "ip6-full-reassembly-expire-walk",
1728
1729     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1730     .error_strings = ip6_full_reassembly_error_strings,
1731
1732 };
1733
1734 static u8 *
1735 format_ip6_full_reass_key (u8 * s, va_list * args)
1736 {
1737   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1738   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1739               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1740               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1741   return s;
1742 }
1743
1744 static u8 *
1745 format_ip6_full_reass (u8 * s, va_list * args)
1746 {
1747   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1748   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1749
1750   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1751               "last_packet_octet: %u, trace_op_counter: %u\n",
1752               reass->id, format_ip6_full_reass_key, &reass->key,
1753               reass->first_bi, reass->data_len, reass->last_packet_octet,
1754               reass->trace_op_counter);
1755   u32 bi = reass->first_bi;
1756   u32 counter = 0;
1757   while (~0 != bi)
1758     {
1759       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1760       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1761       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1762                   "fragment[%u, %u]\n",
1763                   counter, vnb->ip.reass.range_first,
1764                   vnb->ip.reass.range_last, bi,
1765                   ip6_full_reass_buffer_get_data_offset (b),
1766                   ip6_full_reass_buffer_get_data_len (b),
1767                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1768       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1769         {
1770           bi = b->next_buffer;
1771         }
1772       else
1773         {
1774           bi = ~0;
1775         }
1776     }
1777   return s;
1778 }
1779
1780 static clib_error_t *
1781 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1782                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1783 {
1784   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1785
1786   vlib_cli_output (vm, "---------------------");
1787   vlib_cli_output (vm, "IP6 reassembly status");
1788   vlib_cli_output (vm, "---------------------");
1789   bool details = false;
1790   if (unformat (input, "details"))
1791     {
1792       details = true;
1793     }
1794
1795   u32 sum_reass_n = 0;
1796   u64 sum_buffers_n = 0;
1797   ip6_full_reass_t *reass;
1798   uword thread_index;
1799   const uword nthreads = vlib_num_workers () + 1;
1800   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1801     {
1802       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1803       clib_spinlock_lock (&rt->lock);
1804       if (details)
1805         {
1806           pool_foreach (reass, rt->pool) {
1807             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1808           }
1809         }
1810       sum_reass_n += rt->reass_n;
1811       clib_spinlock_unlock (&rt->lock);
1812     }
1813   vlib_cli_output (vm, "---------------------");
1814   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1815                    (long unsigned) sum_reass_n);
1816   vlib_cli_output (vm,
1817                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1818                    (long unsigned) rm->max_reass_n);
1819   vlib_cli_output (vm,
1820                    "Maximum configured amount of fragments "
1821                    "per full IP6 reassembly: %lu\n",
1822                    (long unsigned) rm->max_reass_len);
1823   vlib_cli_output (vm,
1824                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1825                    (long unsigned) rm->timeout_ms);
1826   vlib_cli_output (vm,
1827                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1828                    (long unsigned) rm->expire_walk_interval_ms);
1829   vlib_cli_output (vm, "Buffers in use: %lu\n",
1830                    (long unsigned) sum_buffers_n);
1831   return 0;
1832 }
1833
1834 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1835     .path = "show ip6-full-reassembly",
1836     .short_help = "show ip6-full-reassembly [details]",
1837     .function = show_ip6_full_reass,
1838 };
1839
1840 #ifndef CLIB_MARCH_VARIANT
1841 vnet_api_error_t
1842 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1843 {
1844   return vnet_feature_enable_disable ("ip6-unicast",
1845                                       "ip6-full-reassembly-feature",
1846                                       sw_if_index, enable_disable, 0, 0);
1847 }
1848 #endif /* CLIB_MARCH_VARIANT */
1849
1850 #define foreach_ip6_full_reassembly_handoff_error                       \
1851 _(CONGESTION_DROP, "congestion drop")
1852
1853
1854 typedef enum
1855 {
1856 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1857   foreach_ip6_full_reassembly_handoff_error
1858 #undef _
1859     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1860 } ip6_full_reassembly_handoff_error_t;
1861
1862 static char *ip6_full_reassembly_handoff_error_strings[] = {
1863 #define _(sym,string) string,
1864   foreach_ip6_full_reassembly_handoff_error
1865 #undef _
1866 };
1867
1868 typedef struct
1869 {
1870   u32 next_worker_index;
1871 } ip6_full_reassembly_handoff_trace_t;
1872
1873 static u8 *
1874 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1875 {
1876   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1877   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1878   ip6_full_reassembly_handoff_trace_t *t =
1879     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1880
1881   s =
1882     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1883             t->next_worker_index);
1884
1885   return s;
1886 }
1887
1888 always_inline uword
1889 ip6_full_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1890                                     vlib_frame_t *frame,
1891                                     ip6_full_reass_node_type_t type,
1892                                     bool is_local)
1893 {
1894   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1895
1896   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1897   u32 n_enq, n_left_from, *from;
1898   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1899   u32 fq_index;
1900
1901   from = vlib_frame_vector_args (frame);
1902   n_left_from = frame->n_vectors;
1903   vlib_get_buffers (vm, from, bufs, n_left_from);
1904
1905   b = bufs;
1906   ti = thread_indices;
1907
1908   switch (type)
1909     {
1910     case NORMAL:
1911       if (is_local)
1912         {
1913           fq_index = rm->fq_local_index;
1914         }
1915       else
1916         {
1917           fq_index = rm->fq_index;
1918         }
1919       break;
1920     case FEATURE:
1921       fq_index = rm->fq_feature_index;
1922       break;
1923     case CUSTOM:
1924       fq_index = rm->fq_custom_index;
1925       break;
1926     default:
1927       clib_warning ("Unexpected `type' (%d)!", type);
1928       ASSERT (0);
1929     }
1930   while (n_left_from > 0)
1931     {
1932       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1933
1934       if (PREDICT_FALSE
1935           ((node->flags & VLIB_NODE_FLAG_TRACE)
1936            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1937         {
1938           ip6_full_reassembly_handoff_trace_t *t =
1939             vlib_add_trace (vm, node, b[0], sizeof (*t));
1940           t->next_worker_index = ti[0];
1941         }
1942
1943       n_left_from -= 1;
1944       ti += 1;
1945       b += 1;
1946     }
1947   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1948                                          thread_indices, frame->n_vectors, 1);
1949
1950   if (n_enq < frame->n_vectors)
1951     vlib_node_increment_counter (vm, node->node_index,
1952                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1953                                  frame->n_vectors - n_enq);
1954   return frame->n_vectors;
1955 }
1956
1957 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1958                                                  vlib_node_runtime_t * node,
1959                                                  vlib_frame_t * frame)
1960 {
1961   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
1962                                              false /* is_local */);
1963 }
1964
1965 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1966   .name = "ip6-full-reassembly-handoff",
1967   .vector_size = sizeof (u32),
1968   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1969   .error_strings = ip6_full_reassembly_handoff_error_strings,
1970   .format_trace = format_ip6_full_reassembly_handoff_trace,
1971
1972   .n_next_nodes = 1,
1973
1974   .next_nodes = {
1975     [0] = "error-drop",
1976   },
1977 };
1978
1979 VLIB_NODE_FN (ip6_local_full_reassembly_handoff_node)
1980 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1981 {
1982   return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
1983                                              true /* is_feature */);
1984 }
1985
1986 VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = {
1987   .name = "ip6-local-full-reassembly-handoff",
1988   .vector_size = sizeof (u32),
1989   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1990   .error_strings = ip6_full_reassembly_handoff_error_strings,
1991   .format_trace = format_ip6_full_reassembly_handoff_trace,
1992
1993   .n_next_nodes = 1,
1994
1995   .next_nodes = {
1996     [0] = "error-drop",
1997   },
1998 };
1999
2000 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
2001                                vlib_node_runtime_t * node, vlib_frame_t * frame)
2002 {
2003   return ip6_full_reassembly_handoff_inline (vm, node, frame, FEATURE,
2004                                              false /* is_local */);
2005 }
2006
2007 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
2008   .name = "ip6-full-reass-feature-hoff",
2009   .vector_size = sizeof (u32),
2010   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2011   .error_strings = ip6_full_reassembly_handoff_error_strings,
2012   .format_trace = format_ip6_full_reassembly_handoff_trace,
2013
2014   .n_next_nodes = 1,
2015
2016   .next_nodes = {
2017     [0] = "error-drop",
2018   },
2019 };
2020
2021 VLIB_NODE_FN (ip6_full_reassembly_custom_handoff_node)
2022 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2023 {
2024   return ip6_full_reassembly_handoff_inline (vm, node, frame, CUSTOM,
2025                                              false /* is_local */);
2026 }
2027
2028 VLIB_REGISTER_NODE (ip6_full_reassembly_custom_handoff_node) = {
2029   .name = "ip6-full-reass-custom-hoff",
2030   .vector_size = sizeof (u32),
2031   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
2032   .error_strings = ip6_full_reassembly_handoff_error_strings,
2033   .format_trace = format_ip6_full_reassembly_handoff_trace,
2034
2035   .n_next_nodes = 1,
2036
2037   .next_nodes = {
2038     [0] = "error-drop",
2039   },
2040 };
2041
2042 #ifndef CLIB_MARCH_VARIANT
2043 int
2044 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2045 {
2046   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
2047   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2048   if (is_enable)
2049     {
2050       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2051         {
2052           ++rm->feature_use_refcount_per_intf[sw_if_index];
2053           return vnet_feature_enable_disable ("ip6-unicast",
2054                                               "ip6-full-reassembly-feature",
2055                                               sw_if_index, 1, 0, 0);
2056         }
2057       ++rm->feature_use_refcount_per_intf[sw_if_index];
2058     }
2059   else
2060     {
2061       --rm->feature_use_refcount_per_intf[sw_if_index];
2062       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2063         return vnet_feature_enable_disable ("ip6-unicast",
2064                                             "ip6-full-reassembly-feature",
2065                                             sw_if_index, 0, 0, 0);
2066     }
2067   return -1;
2068 }
2069
2070 void
2071 ip6_local_full_reass_enable_disable (int enable)
2072 {
2073   if (enable)
2074     {
2075       if (!ip6_full_reass_main.is_local_reass_enabled)
2076         {
2077           ip6_full_reass_main.is_local_reass_enabled = 1;
2078           ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
2079                                  ip6_local_full_reass_node.index);
2080         }
2081     }
2082   else
2083     {
2084       if (ip6_full_reass_main.is_local_reass_enabled)
2085         {
2086           ip6_full_reass_main.is_local_reass_enabled = 0;
2087           ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION);
2088         }
2089     }
2090 }
2091
2092 int
2093 ip6_local_full_reass_enabled ()
2094 {
2095   return ip6_full_reass_main.is_local_reass_enabled;
2096 }
2097
2098 #endif
2099
2100 /*
2101  * fd.io coding-style-patch-verification: ON
2102  *
2103  * Local Variables:
2104  * eval: (c-set-style "gnu")
2105  * End:
2106  */