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
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000    // 10 seconds default
  32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  35
  36 typedef enum
  37 {
  38   IP6_FULL_REASS_RC_OK,
  39   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  40   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_FULL_REASS_RC_NO_BUF,
  42   IP6_FULL_REASS_RC_HANDOFF,
  43 } ip6_full_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 xx_id;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_full_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 memory_owner_thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_full_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_full_reass_key_t k;
  77     ip6_full_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_full_reass_kv_t;
  81
  82
  83 always_inline u32
  84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  85 {
  86   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  87   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  88 }
  89
  90 always_inline u16
  91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  92 {
  93   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  94   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  95     (vnb->ip.reass.fragment_first +
  96      ip6_full_reass_buffer_get_data_offset (b)) + 1;
  97 }
  98
  99 typedef struct
 100 {
 101   // hash table key
 102   ip6_full_reass_key_t key;
 103   // time when last packet was received
 104   f64 last_heard;
 105   // internal id of this reassembly
 106   u64 id;
 107   // buffer index of first buffer in this reassembly context
 108   u32 first_bi;
 109   // last octet of packet, ~0 until fragment without more_fragments arrives
 110   u32 last_packet_octet;
 111   // length of data collected so far
 112   u32 data_len;
 113   // trace operation counter
 114   u32 trace_op_counter;
 115   // next index - used by custom apps (~0 if not set)
 116   u32 next_index;
 117   // error next index - used by custom apps (~0 if not set)
 118   u32 error_next_index;
 119   // minimum fragment length for this reassembly - used to estimate MTU
 120   u16 min_fragment_length;
 121   // number of fragments for this reassembly
 122   u32 fragments_n;
 123   // thread owning memory for this context (whose pool contains this ctx)
 124   u32 memory_owner_thread_index;
 125   // thread which received fragment with offset 0 and which sends out the
 126   // completed reassembly
 127   u32 sendout_thread_index;
 128 } ip6_full_reass_t;
 129
 130 typedef struct
 131 {
 132   ip6_full_reass_t *pool;
 133   u32 reass_n;
 134   u32 id_counter;
 135   clib_spinlock_t lock;
 136 } ip6_full_reass_per_thread_t;
 137
 138 typedef struct
 139 {
 140   // IPv6 config
 141   u32 timeout_ms;
 142   f64 timeout;
 143   u32 expire_walk_interval_ms;
 144   // maximum number of fragments in one reassembly
 145   u32 max_reass_len;
 146   // maximum number of reassemblies
 147   u32 max_reass_n;
 148
 149   // IPv6 runtime
 150   clib_bihash_48_8_t hash;
 151
 152   // per-thread data
 153   ip6_full_reass_per_thread_t *per_thread_data;
 154
 155   // convenience
 156   vlib_main_t *vlib_main;
 157
 158   // node index of ip6-drop node
 159   u32 ip6_drop_idx;
 160   u32 ip6_icmp_error_idx;
 161   u32 ip6_full_reass_expire_node_idx;
 162
 163   /** Worker handoff */
 164   u32 fq_index;
 165   u32 fq_feature_index;
 166
 167   // reference count for enabling/disabling feature - per interface
 168   u32 *feature_use_refcount_per_intf;
 169 } ip6_full_reass_main_t;
 170
 171 extern ip6_full_reass_main_t ip6_full_reass_main;
 172
 173 #ifndef CLIB_MARCH_VARIANT
 174 ip6_full_reass_main_t ip6_full_reass_main;
 175 #endif /* CLIB_MARCH_VARIANT */
 176
 177 typedef enum
 178 {
 179   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 180   IP6_FULL_REASSEMBLY_NEXT_DROP,
 181   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 182   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 183   IP6_FULL_REASSEMBLY_N_NEXT,
 184 } ip6_full_reass_next_t;
 185
 186 typedef enum
 187 {
 188   RANGE_NEW,
 189   RANGE_OVERLAP,
 190   ICMP_ERROR_RT_EXCEEDED,
 191   ICMP_ERROR_FL_TOO_BIG,
 192   ICMP_ERROR_FL_NOT_MULT_8,
 193   FINALIZE,
 194   HANDOFF,
 195 } ip6_full_reass_trace_operation_e;
 196
 197 typedef struct
 198 {
 199   u16 range_first;
 200   u16 range_last;
 201   u32 range_bi;
 202   i32 data_offset;
 203   u32 data_len;
 204   u32 first_bi;
 205 } ip6_full_reass_range_trace_t;
 206
 207 typedef struct
 208 {
 209   ip6_full_reass_trace_operation_e action;
 210   u32 reass_id;
 211   ip6_full_reass_range_trace_t trace_range;
 212   u32 op_id;
 213   u32 fragment_first;
 214   u32 fragment_last;
 215   u32 total_data_len;
 216   u32 thread_id;
 217   u32 thread_id_to;
 218   bool is_after_handoff;
 219   ip6_header_t ip6_header;
 220   ip6_frag_hdr_t ip6_frag_header;
 221 } ip6_full_reass_trace_t;
 222
 223 static void
 224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 225                               ip6_full_reass_range_trace_t * trace)
 226 {
 227   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 228   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 229   trace->range_first = vnb->ip.reass.range_first;
 230   trace->range_last = vnb->ip.reass.range_last;
 231   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 232   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 233   trace->range_bi = bi;
 234 }
 235
 236 static u8 *
 237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 238 {
 239   ip6_full_reass_range_trace_t *trace =
 240     va_arg (*args, ip6_full_reass_range_trace_t *);
 241   s =
 242     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 243             trace->range_last, trace->data_offset, trace->data_len,
 244             trace->range_bi);
 245   return s;
 246 }
 247
 248 static u8 *
 249 format_ip6_full_reass_trace (u8 * s, va_list * args)
 250 {
 251   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 252   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 253   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 254   u32 indent = 0;
 255   if (~0 != t->reass_id)
 256     {
 257       if (t->is_after_handoff)
 258         {
 259           s =
 260             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 261                     sizeof (t->ip6_header));
 262           s =
 263             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 264                     sizeof (t->ip6_frag_header));
 265           indent = 2;
 266         }
 267       s =
 268         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 269                 t->reass_id, t->op_id);
 270       indent = format_get_indent (s);
 271       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 272                   t->trace_range.first_bi, t->total_data_len,
 273                   t->fragment_first, t->fragment_last);
 274     }
 275   switch (t->action)
 276     {
 277     case RANGE_NEW:
 278       s = format (s, "\n%Unew %U", format_white_space, indent,
 279                   format_ip6_full_reass_range_trace, &t->trace_range);
 280       break;
 281     case RANGE_OVERLAP:
 282       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 283                   format_ip6_full_reass_range_trace, &t->trace_range);
 284       break;
 285     case ICMP_ERROR_FL_TOO_BIG:
 286       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 287                   format_white_space, indent,
 288                   format_ip6_full_reass_range_trace, &t->trace_range);
 289       break;
 290     case ICMP_ERROR_FL_NOT_MULT_8:
 291       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 292                   format_white_space, indent,
 293                   format_ip6_full_reass_range_trace, &t->trace_range);
 294       break;
 295     case ICMP_ERROR_RT_EXCEEDED:
 296       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 297                   format_white_space, indent);
 298       break;
 299     case FINALIZE:
 300       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 301       break;
 302     case HANDOFF:
 303       s =
 304         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 305                 t->thread_id_to);
 306       break;
 307     }
 308   return s;
 309 }
 310
 311 static void
 312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 313                           ip6_full_reass_main_t * rm,
 314                           ip6_full_reass_t * reass, u32 bi,
 315                           ip6_frag_hdr_t * ip6_frag_header,
 316                           ip6_full_reass_trace_operation_e action,
 317                           u32 thread_id_to)
 318 {
 319   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 320   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 321   bool is_after_handoff = false;
 322   if (pool_is_free_index
 323       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 324     {
 325       // this buffer's trace is gone
 326       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 327       return;
 328     }
 329   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 330     {
 331       is_after_handoff = true;
 332     }
 333   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 334   t->is_after_handoff = is_after_handoff;
 335   if (t->is_after_handoff)
 336     {
 337       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 338                    clib_min (sizeof (t->ip6_header), b->current_length));
 339       if (ip6_frag_header)
 340         {
 341           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 342                        sizeof (t->ip6_frag_header));
 343         }
 344       else
 345         {
 346           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 347         }
 348     }
 349   if (reass)
 350     {
 351       t->reass_id = reass->id;
 352       t->op_id = reass->trace_op_counter;
 353       t->trace_range.first_bi = reass->first_bi;
 354       t->total_data_len = reass->data_len;
 355       ++reass->trace_op_counter;
 356     }
 357   else
 358     {
 359       t->reass_id = ~0;
 360     }
 361   t->action = action;
 362   t->thread_id = vm->thread_index;
 363   t->thread_id_to = thread_id_to;
 364   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 365   t->fragment_first = vnb->ip.reass.fragment_first;
 366   t->fragment_last = vnb->ip.reass.fragment_last;
 367 #if 0
 368   static u8 *s = NULL;
 369   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 370   printf ("%.*s\n", vec_len (s), s);
 371   fflush (stdout);
 372   vec_reset_length (s);
 373 #endif
 374 }
 375
 376 always_inline void
 377 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 378                          ip6_full_reass_t * reass)
 379 {
 380   pool_put (rt->pool, reass);
 381   --rt->reass_n;
 382 }
 383
 384 always_inline void
 385 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 386                      ip6_full_reass_per_thread_t * rt,
 387                      ip6_full_reass_t * reass)
 388 {
 389   clib_bihash_kv_48_8_t kv;
 390   kv.key[0] = reass->key.as_u64[0];
 391   kv.key[1] = reass->key.as_u64[1];
 392   kv.key[2] = reass->key.as_u64[2];
 393   kv.key[3] = reass->key.as_u64[3];
 394   kv.key[4] = reass->key.as_u64[4];
 395   kv.key[5] = reass->key.as_u64[5];
 396   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 397   ip6_full_reass_free_ctx (rt, reass);
 398 }
 399
 400 always_inline void
 401 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 402                          ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
 403 {
 404   u32 range_bi = reass->first_bi;
 405   vlib_buffer_t *range_b;
 406   vnet_buffer_opaque_t *range_vnb;
 407   u32 *to_free = NULL;
 408   while (~0 != range_bi)
 409     {
 410       range_b = vlib_get_buffer (vm, range_bi);
 411       range_vnb = vnet_buffer (range_b);
 412       u32 bi = range_bi;
 413       while (~0 != bi)
 414         {
 415           vec_add1 (to_free, bi);
 416           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 417           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 418             {
 419               bi = b->next_buffer;
 420               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 421             }
 422           else
 423             {
 424               bi = ~0;
 425             }
 426         }
 427       range_bi = range_vnb->ip.reass.next_range_bi;
 428     }
 429   /* send to next_error_index */
 430   if (~0 != reass->error_next_index)
 431     {
 432       u32 n_left_to_next, *to_next, next_index;
 433
 434       next_index = reass->error_next_index;
 435       u32 bi = ~0;
 436
 437       while (vec_len (to_free) > 0)
 438         {
 439           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 440
 441           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 442             {
 443               bi = vec_pop (to_free);
 444
 445               if (~0 != bi)
 446                 {
 447                   to_next[0] = bi;
 448                   to_next += 1;
 449                   n_left_to_next -= 1;
 450                 }
 451             }
 452           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 453         }
 454     }
 455   else
 456     {
 457       vlib_buffer_free (vm, to_free, vec_len (to_free));
 458     }
 459   vec_free (to_free);
 460 }
 461
 462 always_inline void
 463 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 464                            ip6_full_reass_main_t * rm,
 465                            ip6_full_reass_t * reass, u32 * icmp_bi)
 466 {
 467   if (~0 == reass->first_bi)
 468     {
 469       return;
 470     }
 471   if (~0 == reass->next_index)  // custom apps don't want icmp
 472     {
 473       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 474       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 475         {
 476           *icmp_bi = reass->first_bi;
 477           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 478             {
 479               ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 480                                         NULL, ICMP_ERROR_RT_EXCEEDED, ~0);
 481             }
 482           // fragment with offset zero received - send icmp message back
 483           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 484             {
 485               // separate first buffer from chain and steer it towards icmp node
 486               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 487               reass->first_bi = b->next_buffer;
 488             }
 489           else
 490             {
 491               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 492             }
 493           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 494                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 495                                        0);
 496         }
 497     }
 498   ip6_full_reass_drop_all (vm, node, rm, reass);
 499 }
 500
 501 always_inline ip6_full_reass_t *
 502 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 503                                ip6_full_reass_main_t * rm,
 504                                ip6_full_reass_per_thread_t * rt,
 505                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 506                                u8 * do_handoff)
 507 {
 508   ip6_full_reass_t *reass;
 509   f64 now;
 510
 511 again:
 512
 513   reass = NULL;
 514   now = vlib_time_now (vm);
 515
 516   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 517     {
 518       if (vm->thread_index != kv->v.memory_owner_thread_index)
 519         {
 520           *do_handoff = 1;
 521           return NULL;
 522         }
 523
 524       reass =
 525         pool_elt_at_index (rm->per_thread_data
 526                            [kv->v.memory_owner_thread_index].pool,
 527                            kv->v.reass_index);
 528
 529       if (now > reass->last_heard + rm->timeout)
 530         {
 531           ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 532           ip6_full_reass_free (rm, rt, reass);
 533           reass = NULL;
 534         }
 535     }
 536
 537   if (reass)
 538     {
 539       reass->last_heard = now;
 540       return reass;
 541     }
 542
 543   if (rt->reass_n >= rm->max_reass_n)
 544     {
 545       reass = NULL;
 546       return reass;
 547     }
 548   else
 549     {
 550       pool_get (rt->pool, reass);
 551       clib_memset (reass, 0, sizeof (*reass));
 552       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 553       ++rt->id_counter;
 554       reass->first_bi = ~0;
 555       reass->last_packet_octet = ~0;
 556       reass->data_len = 0;
 557       reass->next_index = ~0;
 558       reass->error_next_index = ~0;
 559       ++rt->reass_n;
 560     }
 561
 562   reass->key.as_u64[0] = kv->kv.key[0];
 563   reass->key.as_u64[1] = kv->kv.key[1];
 564   reass->key.as_u64[2] = kv->kv.key[2];
 565   reass->key.as_u64[3] = kv->kv.key[3];
 566   reass->key.as_u64[4] = kv->kv.key[4];
 567   reass->key.as_u64[5] = kv->kv.key[5];
 568   kv->v.reass_index = (reass - rt->pool);
 569   kv->v.memory_owner_thread_index = vm->thread_index;
 570   reass->last_heard = now;
 571
 572   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 573   if (rv)
 574     {
 575       ip6_full_reass_free (rm, rt, reass);
 576       reass = NULL;
 577       // if other worker created a context already work with the other copy
 578       if (-2 == rv)
 579         goto again;
 580     }
 581
 582   return reass;
 583 }
 584
 585 always_inline ip6_full_reass_rc_t
 586 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 587                          ip6_full_reass_main_t * rm,
 588                          ip6_full_reass_per_thread_t * rt,
 589                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 590                          u32 * error0, bool is_custom_app)
 591 {
 592   *bi0 = reass->first_bi;
 593   *error0 = IP6_ERROR_NONE;
 594   ip6_frag_hdr_t *frag_hdr;
 595   vlib_buffer_t *last_b = NULL;
 596   u32 sub_chain_bi = reass->first_bi;
 597   u32 total_length = 0;
 598   u32 buf_cnt = 0;
 599   u32 dropped_cnt = 0;
 600   u32 *vec_drop_compress = NULL;
 601   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 602   do
 603     {
 604       u32 tmp_bi = sub_chain_bi;
 605       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 606       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 607       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 608           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 609         {
 610           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 611           goto free_buffers_and_return;
 612         }
 613
 614       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 615       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 616         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 617       u32 trim_end =
 618         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 619       if (tmp_bi == reass->first_bi)
 620         {
 621           /* first buffer - keep ip6 header */
 622           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 623             {
 624               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 625               goto free_buffers_and_return;
 626             }
 627           trim_front = 0;
 628           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 629             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 630              sizeof (*frag_hdr));
 631           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 632             {
 633               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 634               goto free_buffers_and_return;
 635             }
 636         }
 637       u32 keep_data =
 638         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 639       while (1)
 640         {
 641           ++buf_cnt;
 642           if (trim_front)
 643             {
 644               if (trim_front > tmp->current_length)
 645                 {
 646                   /* drop whole buffer */
 647                   vec_add1 (vec_drop_compress, tmp_bi);
 648                   trim_front -= tmp->current_length;
 649                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 650                     {
 651                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 652                       goto free_buffers_and_return;
 653                     }
 654                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 655                   tmp_bi = tmp->next_buffer;
 656                   tmp = vlib_get_buffer (vm, tmp_bi);
 657                   continue;
 658                 }
 659               else
 660                 {
 661                   vlib_buffer_advance (tmp, trim_front);
 662                   trim_front = 0;
 663                 }
 664             }
 665           if (keep_data)
 666             {
 667               if (last_b)
 668                 {
 669                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 670                   last_b->next_buffer = tmp_bi;
 671                 }
 672               last_b = tmp;
 673               if (keep_data <= tmp->current_length)
 674                 {
 675                   tmp->current_length = keep_data;
 676                   keep_data = 0;
 677                 }
 678               else
 679                 {
 680                   keep_data -= tmp->current_length;
 681                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 682                     {
 683                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 684                       goto free_buffers_and_return;
 685                     }
 686                 }
 687               total_length += tmp->current_length;
 688             }
 689           else
 690             {
 691               vec_add1 (vec_drop_compress, tmp_bi);
 692               if (reass->first_bi == tmp_bi)
 693                 {
 694                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 695                   goto free_buffers_and_return;
 696                 }
 697               ++dropped_cnt;
 698             }
 699           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 700             {
 701               tmp_bi = tmp->next_buffer;
 702               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 703             }
 704           else
 705             {
 706               break;
 707             }
 708         }
 709       sub_chain_bi =
 710         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 711         reass.next_range_bi;
 712     }
 713   while (~0 != sub_chain_bi);
 714
 715   if (!last_b)
 716     {
 717       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 718       goto free_buffers_and_return;
 719     }
 720   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 721   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 722   if (total_length < first_b->current_length)
 723     {
 724       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 725       goto free_buffers_and_return;
 726     }
 727   total_length -= first_b->current_length;
 728   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 729   first_b->total_length_not_including_first_buffer = total_length;
 730   // drop fragment header
 731   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 732   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 733   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 734   ip6_ext_header_t *prev_hdr;
 735   frag_hdr =
 736     ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 737                          &prev_hdr);
 738   if (prev_hdr)
 739     {
 740       prev_hdr->next_hdr = frag_hdr->next_hdr;
 741     }
 742   else
 743     {
 744       ip->protocol = frag_hdr->next_hdr;
 745     }
 746   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 747     {
 748       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 749       goto free_buffers_and_return;
 750     }
 751   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 752            first_b->current_length - ip6_frag_hdr_offset -
 753            sizeof (ip6_frag_hdr_t));
 754   first_b->current_length -= sizeof (*frag_hdr);
 755   ip->payload_length =
 756     clib_host_to_net_u16 (total_length + first_b->current_length -
 757                           sizeof (*ip));
 758   if (!vlib_buffer_chain_linearize (vm, first_b))
 759     {
 760       rv = IP6_FULL_REASS_RC_NO_BUF;
 761       goto free_buffers_and_return;
 762     }
 763   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 764   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 765     {
 766       ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, NULL,
 767                                 FINALIZE, ~0);
 768 #if 0
 769       // following code does a hexdump of packet fragments to stdout ...
 770       do
 771         {
 772           u32 bi = reass->first_bi;
 773           u8 *s = NULL;
 774           while (~0 != bi)
 775             {
 776               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 777               s = format (s, "%u: %U\n", bi, format_hexdump,
 778                           vlib_buffer_get_current (b), b->current_length);
 779               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 780                 {
 781                   bi = b->next_buffer;
 782                 }
 783               else
 784                 {
 785                   break;
 786                 }
 787             }
 788           printf ("%.*s\n", vec_len (s), s);
 789           fflush (stdout);
 790           vec_free (s);
 791         }
 792       while (0);
 793 #endif
 794     }
 795   if (!is_custom_app)
 796     {
 797       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 798     }
 799   else
 800     {
 801       *next0 = reass->next_index;
 802     }
 803   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 804   ip6_full_reass_free (rm, rt, reass);
 805   reass = NULL;
 806 free_buffers_and_return:
 807   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 808   vec_free (vec_drop_compress);
 809   return rv;
 810 }
 811
 812 always_inline void
 813 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 814                                       ip6_full_reass_main_t * rm,
 815                                       ip6_full_reass_per_thread_t * rt,
 816                                       ip6_full_reass_t * reass,
 817                                       u32 prev_range_bi, u32 new_next_bi)
 818 {
 819
 820   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 821   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 822   if (~0 != prev_range_bi)
 823     {
 824       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 825       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 826       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 827       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 828     }
 829   else
 830     {
 831       if (~0 != reass->first_bi)
 832         {
 833           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 834         }
 835       reass->first_bi = new_next_bi;
 836     }
 837   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 838 }
 839
 840 always_inline ip6_full_reass_rc_t
 841 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 842                        ip6_full_reass_main_t * rm,
 843                        ip6_full_reass_per_thread_t * rt,
 844                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 845                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 846                        bool is_custom_app, u32 * handoff_thread_idx)
 847 {
 848   int consumed = 0;
 849   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 850   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 851   if (is_custom_app)
 852     {
 853       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 854       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 855     }
 856
 857   fvnb->ip.reass.ip6_frag_hdr_offset =
 858     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 859   ip6_header_t *fip = vlib_buffer_get_current (fb);
 860   if (fb->current_length < sizeof (*fip) ||
 861       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 862       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 863     {
 864       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 865     }
 866
 867   u32 fragment_first = fvnb->ip.reass.fragment_first =
 868     ip6_frag_hdr_offset_bytes (frag_hdr);
 869   u32 fragment_length =
 870     vlib_buffer_length_in_chain (vm, fb) -
 871     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 872   u32 fragment_last = fvnb->ip.reass.fragment_last =
 873     fragment_first + fragment_length - 1;
 874   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 875   u32 candidate_range_bi = reass->first_bi;
 876   u32 prev_range_bi = ~0;
 877   fvnb->ip.reass.range_first = fragment_first;
 878   fvnb->ip.reass.range_last = fragment_last;
 879   fvnb->ip.reass.next_range_bi = ~0;
 880   if (!more_fragments)
 881     {
 882       reass->last_packet_octet = fragment_last;
 883     }
 884   if (~0 == reass->first_bi)
 885     {
 886       // starting a new reassembly
 887       ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 888                                             *bi0);
 889       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 890       consumed = 1;
 891       reass->fragments_n = 1;
 892       goto check_if_done_maybe;
 893     }
 894   reass->min_fragment_length =
 895     clib_min (clib_net_to_host_u16 (fip->payload_length),
 896               fvnb->ip.reass.estimated_mtu);
 897   while (~0 != candidate_range_bi)
 898     {
 899       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 900       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 901       if (fragment_first > candidate_vnb->ip.reass.range_last)
 902         {
 903           // this fragments starts after candidate range
 904           prev_range_bi = candidate_range_bi;
 905           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 906           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 907               ~0 == candidate_range_bi)
 908             {
 909               // special case - this fragment falls beyond all known ranges
 910               ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 911                                                     prev_range_bi, *bi0);
 912               consumed = 1;
 913               break;
 914             }
 915           continue;
 916         }
 917       if (fragment_last < candidate_vnb->ip.reass.range_first)
 918         {
 919           // this fragment ends before candidate range without any overlap
 920           ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 921                                                 prev_range_bi, *bi0);
 922           consumed = 1;
 923         }
 924       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 925                fragment_last == candidate_vnb->ip.reass.range_last)
 926         {
 927           // duplicate fragment - ignore
 928         }
 929       else
 930         {
 931           // overlapping fragment - not allowed by RFC 8200
 932           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 933             {
 934               ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 935                                         RANGE_OVERLAP, ~0);
 936             }
 937           ip6_full_reass_drop_all (vm, node, rm, reass);
 938           ip6_full_reass_free (rm, rt, reass);
 939           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 940           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 941           return IP6_FULL_REASS_RC_OK;
 942         }
 943       break;
 944     }
 945   ++reass->fragments_n;
 946 check_if_done_maybe:
 947   if (consumed)
 948     {
 949       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 950         {
 951           ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, frag_hdr,
 952                                     RANGE_NEW, ~0);
 953         }
 954     }
 955   if (~0 != reass->last_packet_octet &&
 956       reass->data_len == reass->last_packet_octet + 1)
 957     {
 958       *handoff_thread_idx = reass->sendout_thread_index;
 959       int handoff =
 960         reass->memory_owner_thread_index != reass->sendout_thread_index;
 961       ip6_full_reass_rc_t rc =
 962         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 963                                  is_custom_app);
 964       if (IP6_FULL_REASS_RC_OK == rc && handoff)
 965         {
 966           return IP6_FULL_REASS_RC_HANDOFF;
 967         }
 968       return rc;
 969     }
 970   else
 971     {
 972       if (consumed)
 973         {
 974           *bi0 = ~0;
 975           if (reass->fragments_n > rm->max_reass_len)
 976             {
 977               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 978             }
 979         }
 980       else
 981         {
 982           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 983           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 984         }
 985     }
 986   return IP6_FULL_REASS_RC_OK;
 987 }
 988
 989 always_inline bool
 990 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 991                                            vlib_buffer_t * b,
 992                                            ip6_frag_hdr_t * frag_hdr)
 993 {
 994   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 995   while (ip6_ext_hdr (tmp->next_hdr))
 996     {
 997       tmp = ip6_ext_next_header (tmp);
 998     }
 999   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
1000     {
1001       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1002                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
1003                                    0);
1004       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1005
1006       return false;
1007     }
1008   return true;
1009 }
1010
1011 always_inline bool
1012 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1013                                            vlib_node_runtime_t * node,
1014                                            vlib_buffer_t * b,
1015                                            ip6_frag_hdr_t * frag_hdr)
1016 {
1017   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1018   ip6_header_t *ip = vlib_buffer_get_current (b);
1019   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1020   u32 fragment_length =
1021     vlib_buffer_length_in_chain (vm, b) -
1022     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1023   if (more_fragments && 0 != fragment_length % 8)
1024     {
1025       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1026                                    ICMP6_parameter_problem_erroneous_header_field,
1027                                    (u8 *) & ip->payload_length - (u8 *) ip);
1028       return false;
1029     }
1030   return true;
1031 }
1032
1033 always_inline bool
1034 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1035                                           vlib_node_runtime_t * node,
1036                                           vlib_buffer_t * b,
1037                                           ip6_frag_hdr_t * frag_hdr)
1038 {
1039   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1040   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1041   u32 fragment_length =
1042     vlib_buffer_length_in_chain (vm, b) -
1043     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1044   if (fragment_first + fragment_length > 65535)
1045     {
1046       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1047       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1048                                    ICMP6_parameter_problem_erroneous_header_field,
1049                                    (u8 *) & frag_hdr->fragment_offset_and_more
1050                                    - (u8 *) ip0);
1051       return false;
1052     }
1053   return true;
1054 }
1055
1056 always_inline uword
1057 ip6_full_reassembly_inline (vlib_main_t * vm,
1058                             vlib_node_runtime_t * node,
1059                             vlib_frame_t * frame, bool is_feature,
1060                             bool is_custom_app)
1061 {
1062   u32 *from = vlib_frame_vector_args (frame);
1063   u32 n_left_from, n_left_to_next, *to_next, next_index;
1064   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1065   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1066   clib_spinlock_lock (&rt->lock);
1067
1068   n_left_from = frame->n_vectors;
1069   next_index = node->cached_next_index;
1070   while (n_left_from > 0)
1071     {
1072       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1073
1074       while (n_left_from > 0 && n_left_to_next > 0)
1075         {
1076           u32 bi0;
1077           vlib_buffer_t *b0;
1078           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1079           u32 error0 = IP6_ERROR_NONE;
1080           u32 icmp_bi = ~0;
1081
1082           bi0 = from[0];
1083           b0 = vlib_get_buffer (vm, bi0);
1084
1085           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1086           ip6_frag_hdr_t *frag_hdr = NULL;
1087           ip6_ext_header_t *prev_hdr;
1088           if (ip6_ext_hdr (ip0->protocol))
1089             {
1090               frag_hdr =
1091                 ip6_ext_header_find (vm, b0, ip0,
1092                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
1093                                      &prev_hdr);
1094             }
1095           if (!frag_hdr)
1096             {
1097               // this is a regular packet - no fragmentation
1098               next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1099               goto skip_reass;
1100             }
1101           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1102             (u8 *) frag_hdr - (u8 *) ip0;
1103
1104           if (0 == ip6_frag_hdr_offset (frag_hdr))
1105             {
1106               // first fragment - verify upper-layer is present
1107               if (!ip6_full_reass_verify_upper_layer_present
1108                   (node, b0, frag_hdr))
1109                 {
1110                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1111                   goto skip_reass;
1112                 }
1113             }
1114           if (!ip6_full_reass_verify_fragment_multiple_8
1115               (vm, node, b0, frag_hdr)
1116               || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1117                                                             frag_hdr))
1118             {
1119               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1120               goto skip_reass;
1121             }
1122           ip6_full_reass_kv_t kv;
1123           u8 do_handoff = 0;
1124
1125           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1126           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1127           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1128           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1129           kv.k.as_u64[4] =
1130             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1131                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1132             (u64) frag_hdr->identification;
1133           kv.k.as_u64[5] = ip0->protocol;
1134
1135           ip6_full_reass_t *reass =
1136             ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1137                                            &do_handoff);
1138
1139           if (reass)
1140             {
1141               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1142               if (0 == fragment_first)
1143                 {
1144                   reass->sendout_thread_index = vm->thread_index;
1145                 }
1146             }
1147           if (PREDICT_FALSE (do_handoff))
1148             {
1149               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1150               vnet_buffer (b0)->ip.reass.owner_thread_index =
1151                 kv.v.memory_owner_thread_index;
1152             }
1153           else if (reass)
1154             {
1155               u32 handoff_thread_idx;
1156               switch (ip6_full_reass_update
1157                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1158                        frag_hdr, is_custom_app, &handoff_thread_idx))
1159                 {
1160                 case IP6_FULL_REASS_RC_OK:
1161                   /* nothing to do here */
1162                   break;
1163                 case IP6_FULL_REASS_RC_HANDOFF:
1164                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1165                   b0 = vlib_get_buffer (vm, bi0);
1166                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1167                     handoff_thread_idx;
1168                   break;
1169                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1170                   vlib_node_increment_counter (vm, node->node_index,
1171                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1172                                                1);
1173                   ip6_full_reass_drop_all (vm, node, rm, reass);
1174                   ip6_full_reass_free (rm, rt, reass);
1175                   goto next_packet;
1176                   break;
1177                 case IP6_FULL_REASS_RC_NO_BUF:
1178                   vlib_node_increment_counter (vm, node->node_index,
1179                                                IP6_ERROR_REASS_NO_BUF, 1);
1180                   ip6_full_reass_drop_all (vm, node, rm, reass);
1181                   ip6_full_reass_free (rm, rt, reass);
1182                   goto next_packet;
1183                   break;
1184                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1185                   vlib_node_increment_counter (vm, node->node_index,
1186                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1187                                                1);
1188                   ip6_full_reass_drop_all (vm, node, rm, reass);
1189                   ip6_full_reass_free (rm, rt, reass);
1190                   goto next_packet;
1191                   break;
1192                 }
1193             }
1194           else
1195             {
1196               if (is_feature)
1197                 {
1198                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1199                 }
1200               else
1201                 {
1202                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1203                   next0 = fvnb->ip.reass.error_next_index;
1204                 }
1205               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1206             }
1207
1208           if (~0 != bi0)
1209             {
1210             skip_reass:
1211               to_next[0] = bi0;
1212               to_next += 1;
1213               n_left_to_next -= 1;
1214
1215               /* bi0 might have been updated by reass_finalize, reload */
1216               b0 = vlib_get_buffer (vm, bi0);
1217               if (IP6_ERROR_NONE != error0)
1218                 {
1219                   b0->error = node->errors[error0];
1220                 }
1221
1222               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1223                 {
1224                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1225                     {
1226                       ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1227                                                 frag_hdr, HANDOFF,
1228                                                 vnet_buffer (b0)->ip.
1229                                                 reass.owner_thread_index);
1230                     }
1231                 }
1232               else if (is_feature && IP6_ERROR_NONE == error0)
1233                 {
1234                   vnet_feature_next (&next0, b0);
1235                 }
1236               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1237                                                n_left_to_next, bi0, next0);
1238             }
1239
1240           if (~0 != icmp_bi)
1241             {
1242               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1243               to_next[0] = icmp_bi;
1244               to_next += 1;
1245               n_left_to_next -= 1;
1246               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1247                                                n_left_to_next, icmp_bi,
1248                                                next0);
1249             }
1250         next_packet:
1251           from += 1;
1252           n_left_from -= 1;
1253         }
1254
1255       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1256     }
1257
1258   clib_spinlock_unlock (&rt->lock);
1259   return frame->n_vectors;
1260 }
1261
1262 static char *ip6_full_reassembly_error_strings[] = {
1263 #define _(sym, string) string,
1264   foreach_ip6_error
1265 #undef _
1266 };
1267
1268 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1269                                     vlib_node_runtime_t * node,
1270                                     vlib_frame_t * frame)
1271 {
1272   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1273                                      false /* is_custom_app */ );
1274 }
1275
1276 /* *INDENT-OFF* */
1277 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1278     .name = "ip6-full-reassembly",
1279     .vector_size = sizeof (u32),
1280     .format_trace = format_ip6_full_reass_trace,
1281     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1282     .error_strings = ip6_full_reassembly_error_strings,
1283     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1284     .next_nodes =
1285         {
1286                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1287                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1288                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1289                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1290         },
1291 };
1292 /* *INDENT-ON* */
1293
1294 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1295                                             vlib_node_runtime_t * node,
1296                                             vlib_frame_t * frame)
1297 {
1298   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1299                                      false /* is_custom_app */ );
1300 }
1301
1302 /* *INDENT-OFF* */
1303 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1304     .name = "ip6-full-reassembly-feature",
1305     .vector_size = sizeof (u32),
1306     .format_trace = format_ip6_full_reass_trace,
1307     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1308     .error_strings = ip6_full_reassembly_error_strings,
1309     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1310     .next_nodes =
1311         {
1312                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1313                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1314                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1315                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1316         },
1317 };
1318 /* *INDENT-ON* */
1319
1320 /* *INDENT-OFF* */
1321 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1322     .arc_name = "ip6-unicast",
1323     .node_name = "ip6-full-reassembly-feature",
1324     .runs_before = VNET_FEATURES ("ip6-lookup",
1325                                   "ipsec6-input-feature"),
1326     .runs_after = 0,
1327 };
1328 /* *INDENT-ON* */
1329
1330 #ifndef CLIB_MARCH_VARIANT
1331 static u32
1332 ip6_full_reass_get_nbuckets ()
1333 {
1334   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1335   u32 nbuckets;
1336   u8 i;
1337
1338   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1339
1340   for (i = 0; i < 31; i++)
1341     if ((1 << i) >= nbuckets)
1342       break;
1343   nbuckets = 1 << i;
1344
1345   return nbuckets;
1346 }
1347 #endif /* CLIB_MARCH_VARIANT */
1348
1349 typedef enum
1350 {
1351   IP6_EVENT_CONFIG_CHANGED = 1,
1352 } ip6_full_reass_event_t;
1353
1354 #ifndef CLIB_MARCH_VARIANT
1355 typedef struct
1356 {
1357   int failure;
1358   clib_bihash_48_8_t *new_hash;
1359 } ip6_rehash_cb_ctx;
1360
1361 static int
1362 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1363 {
1364   ip6_rehash_cb_ctx *ctx = _ctx;
1365   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1366     {
1367       ctx->failure = 1;
1368     }
1369   return (BIHASH_WALK_CONTINUE);
1370 }
1371
1372 static void
1373 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1374                            u32 max_reassembly_length,
1375                            u32 expire_walk_interval_ms)
1376 {
1377   ip6_full_reass_main.timeout_ms = timeout_ms;
1378   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1379   ip6_full_reass_main.max_reass_n = max_reassemblies;
1380   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1381   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1382 }
1383
1384 vnet_api_error_t
1385 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1386                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1387 {
1388   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1389   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1390                              max_reassembly_length, expire_walk_interval_ms);
1391   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1392                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1393                              IP6_EVENT_CONFIG_CHANGED, 0);
1394   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1395   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1396     {
1397       clib_bihash_48_8_t new_hash;
1398       clib_memset (&new_hash, 0, sizeof (new_hash));
1399       ip6_rehash_cb_ctx ctx;
1400       ctx.failure = 0;
1401       ctx.new_hash = &new_hash;
1402       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1403                              new_nbuckets * 1024);
1404       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1405                                                ip6_rehash_cb, &ctx);
1406       if (ctx.failure)
1407         {
1408           clib_bihash_free_48_8 (&new_hash);
1409           return -1;
1410         }
1411       else
1412         {
1413           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1414           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1415                             sizeof (ip6_full_reass_main.hash));
1416           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1417         }
1418     }
1419   return 0;
1420 }
1421
1422 vnet_api_error_t
1423 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1424                     u32 * max_reassembly_length,
1425                     u32 * expire_walk_interval_ms)
1426 {
1427   *timeout_ms = ip6_full_reass_main.timeout_ms;
1428   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1429   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1430   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1431   return 0;
1432 }
1433
1434 static clib_error_t *
1435 ip6_full_reass_init_function (vlib_main_t * vm)
1436 {
1437   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1438   clib_error_t *error = 0;
1439   u32 nbuckets;
1440   vlib_node_t *node;
1441
1442   rm->vlib_main = vm;
1443
1444   vec_validate (rm->per_thread_data, vlib_num_workers ());
1445   ip6_full_reass_per_thread_t *rt;
1446   vec_foreach (rt, rm->per_thread_data)
1447   {
1448     clib_spinlock_init (&rt->lock);
1449     pool_alloc (rt->pool, rm->max_reass_n);
1450   }
1451
1452   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1453   ASSERT (node);
1454   rm->ip6_full_reass_expire_node_idx = node->index;
1455
1456   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1457                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1458                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1459                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1460
1461   nbuckets = ip6_full_reass_get_nbuckets ();
1462   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1463                          nbuckets * 1024);
1464
1465   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1466   ASSERT (node);
1467   rm->ip6_drop_idx = node->index;
1468   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1469   ASSERT (node);
1470   rm->ip6_icmp_error_idx = node->index;
1471
1472   if ((error = vlib_call_init_function (vm, ip_main_init)))
1473     return error;
1474   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1475                          ip6_full_reass_node.index);
1476
1477   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1478   rm->fq_feature_index =
1479     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1480
1481   rm->feature_use_refcount_per_intf = NULL;
1482   return error;
1483 }
1484
1485 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1486 #endif /* CLIB_MARCH_VARIANT */
1487
1488 static uword
1489 ip6_full_reass_walk_expired (vlib_main_t * vm,
1490                              vlib_node_runtime_t * node, vlib_frame_t * f)
1491 {
1492   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1493   uword event_type, *event_data = 0;
1494
1495   while (true)
1496     {
1497       vlib_process_wait_for_event_or_clock (vm,
1498                                             (f64) rm->expire_walk_interval_ms
1499                                             / (f64) MSEC_PER_SEC);
1500       event_type = vlib_process_get_events (vm, &event_data);
1501
1502       switch (event_type)
1503         {
1504         case ~0:                /* no events => timeout */
1505           /* nothing to do here */
1506           break;
1507         case IP6_EVENT_CONFIG_CHANGED:
1508           break;
1509         default:
1510           clib_warning ("BUG: event type 0x%wx", event_type);
1511           break;
1512         }
1513       f64 now = vlib_time_now (vm);
1514
1515       ip6_full_reass_t *reass;
1516       int *pool_indexes_to_free = NULL;
1517
1518       uword thread_index = 0;
1519       int index;
1520       const uword nthreads = vlib_num_workers () + 1;
1521       u32 *vec_icmp_bi = NULL;
1522       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1523         {
1524           ip6_full_reass_per_thread_t *rt =
1525             &rm->per_thread_data[thread_index];
1526           clib_spinlock_lock (&rt->lock);
1527
1528           vec_reset_length (pool_indexes_to_free);
1529           /* *INDENT-OFF* */
1530           pool_foreach_index (index, rt->pool)  {
1531                                 reass = pool_elt_at_index (rt->pool, index);
1532                                 if (now > reass->last_heard + rm->timeout)
1533                                   {
1534                                     vec_add1 (pool_indexes_to_free, index);
1535                                   }
1536                               }
1537           /* *INDENT-ON* */
1538           int *i;
1539           /* *INDENT-OFF* */
1540           vec_foreach (i, pool_indexes_to_free)
1541           {
1542             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1543             u32 icmp_bi = ~0;
1544             ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1545             if (~0 != icmp_bi)
1546               vec_add1 (vec_icmp_bi, icmp_bi);
1547
1548             ip6_full_reass_free (rm, rt, reass);
1549           }
1550           /* *INDENT-ON* */
1551
1552           clib_spinlock_unlock (&rt->lock);
1553         }
1554
1555       while (vec_len (vec_icmp_bi) > 0)
1556         {
1557           vlib_frame_t *f =
1558             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1559           u32 *to_next = vlib_frame_vector_args (f);
1560           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1561           int trace_frame = 0;
1562           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1563             {
1564               u32 bi = vec_pop (vec_icmp_bi);
1565               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1566               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1567                 trace_frame = 1;
1568               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1569               to_next[0] = bi;
1570               ++f->n_vectors;
1571               to_next += 1;
1572               n_left_to_next -= 1;
1573             }
1574           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1575           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1576         }
1577
1578       vec_free (pool_indexes_to_free);
1579       vec_free (vec_icmp_bi);
1580       if (event_data)
1581         {
1582           _vec_len (event_data) = 0;
1583         }
1584     }
1585
1586   return 0;
1587 }
1588
1589 /* *INDENT-OFF* */
1590 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1591     .function = ip6_full_reass_walk_expired,
1592     .format_trace = format_ip6_full_reass_trace,
1593     .type = VLIB_NODE_TYPE_PROCESS,
1594     .name = "ip6-full-reassembly-expire-walk",
1595
1596     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1597     .error_strings = ip6_full_reassembly_error_strings,
1598
1599 };
1600 /* *INDENT-ON* */
1601
1602 static u8 *
1603 format_ip6_full_reass_key (u8 * s, va_list * args)
1604 {
1605   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1606   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1607               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1608               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1609   return s;
1610 }
1611
1612 static u8 *
1613 format_ip6_full_reass (u8 * s, va_list * args)
1614 {
1615   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1616   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1617
1618   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1619               "last_packet_octet: %u, trace_op_counter: %u\n",
1620               reass->id, format_ip6_full_reass_key, &reass->key,
1621               reass->first_bi, reass->data_len, reass->last_packet_octet,
1622               reass->trace_op_counter);
1623   u32 bi = reass->first_bi;
1624   u32 counter = 0;
1625   while (~0 != bi)
1626     {
1627       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1628       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1629       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1630                   "fragment[%u, %u]\n",
1631                   counter, vnb->ip.reass.range_first,
1632                   vnb->ip.reass.range_last, bi,
1633                   ip6_full_reass_buffer_get_data_offset (b),
1634                   ip6_full_reass_buffer_get_data_len (b),
1635                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1636       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1637         {
1638           bi = b->next_buffer;
1639         }
1640       else
1641         {
1642           bi = ~0;
1643         }
1644     }
1645   return s;
1646 }
1647
1648 static clib_error_t *
1649 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1650                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1651 {
1652   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1653
1654   vlib_cli_output (vm, "---------------------");
1655   vlib_cli_output (vm, "IP6 reassembly status");
1656   vlib_cli_output (vm, "---------------------");
1657   bool details = false;
1658   if (unformat (input, "details"))
1659     {
1660       details = true;
1661     }
1662
1663   u32 sum_reass_n = 0;
1664   u64 sum_buffers_n = 0;
1665   ip6_full_reass_t *reass;
1666   uword thread_index;
1667   const uword nthreads = vlib_num_workers () + 1;
1668   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1669     {
1670       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1671       clib_spinlock_lock (&rt->lock);
1672       if (details)
1673         {
1674           /* *INDENT-OFF* */
1675           pool_foreach (reass, rt->pool) {
1676             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1677           }
1678           /* *INDENT-ON* */
1679         }
1680       sum_reass_n += rt->reass_n;
1681       clib_spinlock_unlock (&rt->lock);
1682     }
1683   vlib_cli_output (vm, "---------------------");
1684   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1685                    (long unsigned) sum_reass_n);
1686   vlib_cli_output (vm,
1687                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1688                    (long unsigned) rm->max_reass_n);
1689   vlib_cli_output (vm,
1690                    "Maximum configured amount of fragments "
1691                    "per full IP6 reassembly: %lu\n",
1692                    (long unsigned) rm->max_reass_len);
1693   vlib_cli_output (vm,
1694                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1695                    (long unsigned) rm->timeout_ms);
1696   vlib_cli_output (vm,
1697                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1698                    (long unsigned) rm->expire_walk_interval_ms);
1699   vlib_cli_output (vm, "Buffers in use: %lu\n",
1700                    (long unsigned) sum_buffers_n);
1701   return 0;
1702 }
1703
1704 /* *INDENT-OFF* */
1705 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1706     .path = "show ip6-full-reassembly",
1707     .short_help = "show ip6-full-reassembly [details]",
1708     .function = show_ip6_full_reass,
1709 };
1710 /* *INDENT-ON* */
1711
1712 #ifndef CLIB_MARCH_VARIANT
1713 vnet_api_error_t
1714 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1715 {
1716   return vnet_feature_enable_disable ("ip6-unicast",
1717                                       "ip6-full-reassembly-feature",
1718                                       sw_if_index, enable_disable, 0, 0);
1719 }
1720 #endif /* CLIB_MARCH_VARIANT */
1721
1722 #define foreach_ip6_full_reassembly_handoff_error                       \
1723 _(CONGESTION_DROP, "congestion drop")
1724
1725
1726 typedef enum
1727 {
1728 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1729   foreach_ip6_full_reassembly_handoff_error
1730 #undef _
1731     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1732 } ip6_full_reassembly_handoff_error_t;
1733
1734 static char *ip6_full_reassembly_handoff_error_strings[] = {
1735 #define _(sym,string) string,
1736   foreach_ip6_full_reassembly_handoff_error
1737 #undef _
1738 };
1739
1740 typedef struct
1741 {
1742   u32 next_worker_index;
1743 } ip6_full_reassembly_handoff_trace_t;
1744
1745 static u8 *
1746 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1747 {
1748   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1749   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1750   ip6_full_reassembly_handoff_trace_t *t =
1751     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1752
1753   s =
1754     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1755             t->next_worker_index);
1756
1757   return s;
1758 }
1759
1760 always_inline uword
1761 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1762                                     vlib_node_runtime_t * node,
1763                                     vlib_frame_t * frame, bool is_feature)
1764 {
1765   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1766
1767   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1768   u32 n_enq, n_left_from, *from;
1769   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1770   u32 fq_index;
1771
1772   from = vlib_frame_vector_args (frame);
1773   n_left_from = frame->n_vectors;
1774   vlib_get_buffers (vm, from, bufs, n_left_from);
1775
1776   b = bufs;
1777   ti = thread_indices;
1778
1779   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1780
1781   while (n_left_from > 0)
1782     {
1783       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1784
1785       if (PREDICT_FALSE
1786           ((node->flags & VLIB_NODE_FLAG_TRACE)
1787            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1788         {
1789           ip6_full_reassembly_handoff_trace_t *t =
1790             vlib_add_trace (vm, node, b[0], sizeof (*t));
1791           t->next_worker_index = ti[0];
1792         }
1793
1794       n_left_from -= 1;
1795       ti += 1;
1796       b += 1;
1797     }
1798   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1799                                          thread_indices, frame->n_vectors, 1);
1800
1801   if (n_enq < frame->n_vectors)
1802     vlib_node_increment_counter (vm, node->node_index,
1803                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1804                                  frame->n_vectors - n_enq);
1805   return frame->n_vectors;
1806 }
1807
1808 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1809                                                  vlib_node_runtime_t * node,
1810                                                  vlib_frame_t * frame)
1811 {
1812   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1813                                              false /* is_feature */ );
1814 }
1815
1816 /* *INDENT-OFF* */
1817 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1818   .name = "ip6-full-reassembly-handoff",
1819   .vector_size = sizeof (u32),
1820   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1821   .error_strings = ip6_full_reassembly_handoff_error_strings,
1822   .format_trace = format_ip6_full_reassembly_handoff_trace,
1823
1824   .n_next_nodes = 1,
1825
1826   .next_nodes = {
1827     [0] = "error-drop",
1828   },
1829 };
1830
1831
1832 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1833                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1834 {
1835   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1836 }
1837
1838
1839 /* *INDENT-OFF* */
1840 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1841   .name = "ip6-full-reass-feature-hoff",
1842   .vector_size = sizeof (u32),
1843   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1844   .error_strings = ip6_full_reassembly_handoff_error_strings,
1845   .format_trace = format_ip6_full_reassembly_handoff_trace,
1846
1847   .n_next_nodes = 1,
1848
1849   .next_nodes = {
1850     [0] = "error-drop",
1851   },
1852 };
1853 /* *INDENT-ON* */
1854
1855 #ifndef CLIB_MARCH_VARIANT
1856 int
1857 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1858 {
1859   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1860   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1861   if (is_enable)
1862     {
1863       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1864         {
1865           ++rm->feature_use_refcount_per_intf[sw_if_index];
1866           return vnet_feature_enable_disable ("ip6-unicast",
1867                                               "ip6-full-reassembly-feature",
1868                                               sw_if_index, 1, 0, 0);
1869         }
1870       ++rm->feature_use_refcount_per_intf[sw_if_index];
1871     }
1872   else
1873     {
1874       --rm->feature_use_refcount_per_intf[sw_if_index];
1875       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1876         return vnet_feature_enable_disable ("ip6-unicast",
1877                                             "ip6-full-reassembly-feature",
1878                                             sw_if_index, 0, 0, 0);
1879     }
1880   return -1;
1881 }
1882 #endif
1883
1884 /*
1885  * fd.io coding-style-patch-verification: ON
1886  *
1887  * Local Variables:
1888  * eval: (c-set-style "gnu")
1889  * End:
1890  */