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 } ip6_full_reass_main_t;
 168
 169 extern ip6_full_reass_main_t ip6_full_reass_main;
 170
 171 #ifndef CLIB_MARCH_VARIANT
 172 ip6_full_reass_main_t ip6_full_reass_main;
 173 #endif /* CLIB_MARCH_VARIANT */
 174
 175 typedef enum
 176 {
 177   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 178   IP6_FULL_REASSEMBLY_NEXT_DROP,
 179   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 180   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 181   IP6_FULL_REASSEMBLY_N_NEXT,
 182 } ip6_full_reass_next_t;
 183
 184 typedef enum
 185 {
 186   RANGE_NEW,
 187   RANGE_OVERLAP,
 188   ICMP_ERROR_RT_EXCEEDED,
 189   ICMP_ERROR_FL_TOO_BIG,
 190   ICMP_ERROR_FL_NOT_MULT_8,
 191   FINALIZE,
 192   HANDOFF,
 193 } ip6_full_reass_trace_operation_e;
 194
 195 typedef struct
 196 {
 197   u16 range_first;
 198   u16 range_last;
 199   u32 range_bi;
 200   i32 data_offset;
 201   u32 data_len;
 202   u32 first_bi;
 203 } ip6_full_reass_range_trace_t;
 204
 205 typedef struct
 206 {
 207   ip6_full_reass_trace_operation_e action;
 208   u32 reass_id;
 209   ip6_full_reass_range_trace_t trace_range;
 210   u32 op_id;
 211   u32 fragment_first;
 212   u32 fragment_last;
 213   u32 total_data_len;
 214   u32 thread_id;
 215   u32 thread_id_to;
 216 } ip6_full_reass_trace_t;
 217
 218 static void
 219 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 220                               ip6_full_reass_range_trace_t * trace)
 221 {
 222   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 223   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 224   trace->range_first = vnb->ip.reass.range_first;
 225   trace->range_last = vnb->ip.reass.range_last;
 226   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 227   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 228   trace->range_bi = bi;
 229 }
 230
 231 static u8 *
 232 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 233 {
 234   ip6_full_reass_range_trace_t *trace =
 235     va_arg (*args, ip6_full_reass_range_trace_t *);
 236   s =
 237     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 238             trace->range_last, trace->data_offset, trace->data_len,
 239             trace->range_bi);
 240   return s;
 241 }
 242
 243 static u8 *
 244 format_ip6_full_reass_trace (u8 * s, va_list * args)
 245 {
 246   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 247   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 248   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 249   u32 indent = 0;
 250   if (~0 != t->reass_id)
 251     {
 252       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 253       indent = format_get_indent (s);
 254       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 255                   t->trace_range.first_bi, t->total_data_len,
 256                   t->fragment_first, t->fragment_last);
 257     }
 258   switch (t->action)
 259     {
 260     case RANGE_NEW:
 261       s = format (s, "\n%Unew %U", format_white_space, indent,
 262                   format_ip6_full_reass_range_trace, &t->trace_range);
 263       break;
 264     case RANGE_OVERLAP:
 265       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 266                   format_ip6_full_reass_range_trace, &t->trace_range);
 267       break;
 268     case ICMP_ERROR_FL_TOO_BIG:
 269       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 270                   format_white_space, indent,
 271                   format_ip6_full_reass_range_trace, &t->trace_range);
 272       break;
 273     case ICMP_ERROR_FL_NOT_MULT_8:
 274       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 275                   format_white_space, indent,
 276                   format_ip6_full_reass_range_trace, &t->trace_range);
 277       break;
 278     case ICMP_ERROR_RT_EXCEEDED:
 279       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 280                   format_white_space, indent);
 281       break;
 282     case FINALIZE:
 283       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 284       break;
 285     case HANDOFF:
 286       s =
 287         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 288                 t->thread_id_to);
 289       break;
 290     }
 291   return s;
 292 }
 293
 294 static void
 295 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 296                           ip6_full_reass_main_t * rm,
 297                           ip6_full_reass_t * reass, u32 bi,
 298                           ip6_full_reass_trace_operation_e action,
 299                           u32 thread_id_to)
 300 {
 301   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 302   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 303   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 304   if (reass)
 305     {
 306       t->reass_id = reass->id;
 307       t->op_id = reass->trace_op_counter;
 308       t->trace_range.first_bi = reass->first_bi;
 309       t->total_data_len = reass->data_len;
 310       ++reass->trace_op_counter;
 311     }
 312   else
 313     {
 314       t->reass_id = ~0;
 315     }
 316   t->action = action;
 317   t->thread_id = vm->thread_index;
 318   t->thread_id_to = thread_id_to;
 319   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 320   t->fragment_first = vnb->ip.reass.fragment_first;
 321   t->fragment_last = vnb->ip.reass.fragment_last;
 322 #if 0
 323   static u8 *s = NULL;
 324   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 325   printf ("%.*s\n", vec_len (s), s);
 326   fflush (stdout);
 327   vec_reset_length (s);
 328 #endif
 329 }
 330
 331 always_inline void
 332 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 333                          ip6_full_reass_t * reass)
 334 {
 335   pool_put (rt->pool, reass);
 336   --rt->reass_n;
 337 }
 338
 339 always_inline void
 340 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 341                      ip6_full_reass_per_thread_t * rt,
 342                      ip6_full_reass_t * reass)
 343 {
 344   clib_bihash_kv_48_8_t kv;
 345   kv.key[0] = reass->key.as_u64[0];
 346   kv.key[1] = reass->key.as_u64[1];
 347   kv.key[2] = reass->key.as_u64[2];
 348   kv.key[3] = reass->key.as_u64[3];
 349   kv.key[4] = reass->key.as_u64[4];
 350   kv.key[5] = reass->key.as_u64[5];
 351   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 352   ip6_full_reass_free_ctx (rt, reass);
 353 }
 354
 355 always_inline void
 356 ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 357                          ip6_full_reass_main_t * rm, ip6_full_reass_t * reass)
 358 {
 359   u32 range_bi = reass->first_bi;
 360   vlib_buffer_t *range_b;
 361   vnet_buffer_opaque_t *range_vnb;
 362   u32 *to_free = NULL;
 363   while (~0 != range_bi)
 364     {
 365       range_b = vlib_get_buffer (vm, range_bi);
 366       range_vnb = vnet_buffer (range_b);
 367       u32 bi = range_bi;
 368       while (~0 != bi)
 369         {
 370           vec_add1 (to_free, bi);
 371           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 372           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 373             {
 374               bi = b->next_buffer;
 375               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 376             }
 377           else
 378             {
 379               bi = ~0;
 380             }
 381         }
 382       range_bi = range_vnb->ip.reass.next_range_bi;
 383     }
 384   /* send to next_error_index */
 385   if (~0 != reass->error_next_index)
 386     {
 387       u32 n_left_to_next, *to_next, next_index;
 388
 389       next_index = reass->error_next_index;
 390       u32 bi = ~0;
 391
 392       while (vec_len (to_free) > 0)
 393         {
 394           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 395
 396           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 397             {
 398               bi = vec_pop (to_free);
 399
 400               if (~0 != bi)
 401                 {
 402                   to_next[0] = bi;
 403                   to_next += 1;
 404                   n_left_to_next -= 1;
 405                 }
 406             }
 407           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 408         }
 409     }
 410   else
 411     {
 412       vlib_buffer_free (vm, to_free, vec_len (to_free));
 413     }
 414   vec_free (to_free);
 415 }
 416
 417 always_inline void
 418 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 419                            ip6_full_reass_main_t * rm,
 420                            ip6_full_reass_t * reass, u32 * icmp_bi)
 421 {
 422   if (~0 == reass->first_bi)
 423     {
 424       return;
 425     }
 426   if (~0 == reass->next_index)  // custom apps don't want icmp
 427     {
 428       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 429       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 430         {
 431           *icmp_bi = reass->first_bi;
 432           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 433             {
 434               ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 435                                         ICMP_ERROR_RT_EXCEEDED, ~0);
 436             }
 437           // fragment with offset zero received - send icmp message back
 438           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 439             {
 440               // separate first buffer from chain and steer it towards icmp node
 441               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 442               reass->first_bi = b->next_buffer;
 443             }
 444           else
 445             {
 446               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 447             }
 448           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 449                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 450                                        0);
 451         }
 452     }
 453   ip6_full_reass_drop_all (vm, node, rm, reass);
 454 }
 455
 456 always_inline ip6_full_reass_t *
 457 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 458                                ip6_full_reass_main_t * rm,
 459                                ip6_full_reass_per_thread_t * rt,
 460                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 461                                u8 * do_handoff)
 462 {
 463   ip6_full_reass_t *reass;
 464   f64 now;
 465
 466 again:
 467
 468   reass = NULL;
 469   now = vlib_time_now (vm);
 470
 471   if (!clib_bihash_search_48_8
 472       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 473     {
 474       reass =
 475         pool_elt_at_index (rm->per_thread_data
 476                            [kv->v.memory_owner_thread_index].pool,
 477                            kv->v.reass_index);
 478       if (vm->thread_index != kv->v.memory_owner_thread_index)
 479         {
 480           *do_handoff = 1;
 481           return reass;
 482         }
 483
 484       if (now > reass->last_heard + rm->timeout)
 485         {
 486           ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 487           ip6_full_reass_free (rm, rt, reass);
 488           reass = NULL;
 489         }
 490     }
 491
 492   if (reass)
 493     {
 494       reass->last_heard = now;
 495       return reass;
 496     }
 497
 498   if (rt->reass_n >= rm->max_reass_n)
 499     {
 500       reass = NULL;
 501       return reass;
 502     }
 503   else
 504     {
 505       pool_get (rt->pool, reass);
 506       clib_memset (reass, 0, sizeof (*reass));
 507       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 508       ++rt->id_counter;
 509       reass->first_bi = ~0;
 510       reass->last_packet_octet = ~0;
 511       reass->data_len = 0;
 512       reass->next_index = ~0;
 513       reass->error_next_index = ~0;
 514       ++rt->reass_n;
 515     }
 516
 517   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 518   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 519   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 520   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 521   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 522   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 523   kv->v.reass_index = (reass - rt->pool);
 524   kv->v.memory_owner_thread_index = vm->thread_index;
 525   reass->last_heard = now;
 526
 527   int rv =
 528     clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
 529   if (rv)
 530     {
 531       ip6_full_reass_free (rm, rt, reass);
 532       reass = NULL;
 533       // if other worker created a context already work with the other copy
 534       if (-2 == rv)
 535         goto again;
 536     }
 537
 538   return reass;
 539 }
 540
 541 always_inline ip6_full_reass_rc_t
 542 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 543                          ip6_full_reass_main_t * rm,
 544                          ip6_full_reass_per_thread_t * rt,
 545                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 546                          u32 * error0, bool is_custom_app)
 547 {
 548   *bi0 = reass->first_bi;
 549   *error0 = IP6_ERROR_NONE;
 550   ip6_frag_hdr_t *frag_hdr;
 551   vlib_buffer_t *last_b = NULL;
 552   u32 sub_chain_bi = reass->first_bi;
 553   u32 total_length = 0;
 554   u32 buf_cnt = 0;
 555   u32 dropped_cnt = 0;
 556   u32 *vec_drop_compress = NULL;
 557   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 558   do
 559     {
 560       u32 tmp_bi = sub_chain_bi;
 561       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 562       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 563       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 564           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 565         {
 566           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 567           goto free_buffers_and_return;
 568         }
 569
 570       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 571       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 572         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 573       u32 trim_end =
 574         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 575       if (tmp_bi == reass->first_bi)
 576         {
 577           /* first buffer - keep ip6 header */
 578           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 579             {
 580               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 581               goto free_buffers_and_return;
 582             }
 583           trim_front = 0;
 584           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 585             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 586              sizeof (*frag_hdr));
 587           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 588             {
 589               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 590               goto free_buffers_and_return;
 591             }
 592         }
 593       u32 keep_data =
 594         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 595       while (1)
 596         {
 597           ++buf_cnt;
 598           if (trim_front)
 599             {
 600               if (trim_front > tmp->current_length)
 601                 {
 602                   /* drop whole buffer */
 603                   vec_add1 (vec_drop_compress, tmp_bi);
 604                   trim_front -= tmp->current_length;
 605                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 606                     {
 607                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 608                       goto free_buffers_and_return;
 609                     }
 610                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 611                   tmp_bi = tmp->next_buffer;
 612                   tmp = vlib_get_buffer (vm, tmp_bi);
 613                   continue;
 614                 }
 615               else
 616                 {
 617                   vlib_buffer_advance (tmp, trim_front);
 618                   trim_front = 0;
 619                 }
 620             }
 621           if (keep_data)
 622             {
 623               if (last_b)
 624                 {
 625                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 626                   last_b->next_buffer = tmp_bi;
 627                 }
 628               last_b = tmp;
 629               if (keep_data <= tmp->current_length)
 630                 {
 631                   tmp->current_length = keep_data;
 632                   keep_data = 0;
 633                 }
 634               else
 635                 {
 636                   keep_data -= tmp->current_length;
 637                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 638                     {
 639                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 640                       goto free_buffers_and_return;
 641                     }
 642                 }
 643               total_length += tmp->current_length;
 644             }
 645           else
 646             {
 647               vec_add1 (vec_drop_compress, tmp_bi);
 648               if (reass->first_bi == tmp_bi)
 649                 {
 650                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 651                   goto free_buffers_and_return;
 652                 }
 653               ++dropped_cnt;
 654             }
 655           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 656             {
 657               tmp_bi = tmp->next_buffer;
 658               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 659             }
 660           else
 661             {
 662               break;
 663             }
 664         }
 665       sub_chain_bi =
 666         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 667         reass.next_range_bi;
 668     }
 669   while (~0 != sub_chain_bi);
 670
 671   if (!last_b)
 672     {
 673       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 674       goto free_buffers_and_return;
 675     }
 676   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 677   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 678   if (total_length < first_b->current_length)
 679     {
 680       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 681       goto free_buffers_and_return;
 682     }
 683   total_length -= first_b->current_length;
 684   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 685   first_b->total_length_not_including_first_buffer = total_length;
 686   // drop fragment header
 687   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 688   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 689   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 690   ip6_ext_header_t *prev_hdr;
 691   ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
 692                          IP_PROTOCOL_IPV6_FRAGMENTATION);
 693   if (prev_hdr)
 694     {
 695       prev_hdr->next_hdr = frag_hdr->next_hdr;
 696     }
 697   else
 698     {
 699       ip->protocol = frag_hdr->next_hdr;
 700     }
 701   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 702     {
 703       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 704       goto free_buffers_and_return;
 705     }
 706   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 707            first_b->current_length - ip6_frag_hdr_offset -
 708            sizeof (ip6_frag_hdr_t));
 709   first_b->current_length -= sizeof (*frag_hdr);
 710   ip->payload_length =
 711     clib_host_to_net_u16 (total_length + first_b->current_length -
 712                           sizeof (*ip));
 713   if (!vlib_buffer_chain_linearize (vm, first_b))
 714     {
 715       rv = IP6_FULL_REASS_RC_NO_BUF;
 716       goto free_buffers_and_return;
 717     }
 718   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 719   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 720     {
 721       ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 722                                 FINALIZE, ~0);
 723 #if 0
 724       // following code does a hexdump of packet fragments to stdout ...
 725       do
 726         {
 727           u32 bi = reass->first_bi;
 728           u8 *s = NULL;
 729           while (~0 != bi)
 730             {
 731               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 732               s = format (s, "%u: %U\n", bi, format_hexdump,
 733                           vlib_buffer_get_current (b), b->current_length);
 734               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 735                 {
 736                   bi = b->next_buffer;
 737                 }
 738               else
 739                 {
 740                   break;
 741                 }
 742             }
 743           printf ("%.*s\n", vec_len (s), s);
 744           fflush (stdout);
 745           vec_free (s);
 746         }
 747       while (0);
 748 #endif
 749     }
 750   if (!is_custom_app)
 751     {
 752       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 753     }
 754   else
 755     {
 756       *next0 = reass->next_index;
 757     }
 758   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 759   ip6_full_reass_free (rm, rt, reass);
 760   reass = NULL;
 761 free_buffers_and_return:
 762   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 763   vec_free (vec_drop_compress);
 764   return rv;
 765 }
 766
 767 always_inline void
 768 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 769                                       ip6_full_reass_main_t * rm,
 770                                       ip6_full_reass_per_thread_t * rt,
 771                                       ip6_full_reass_t * reass,
 772                                       u32 prev_range_bi, u32 new_next_bi)
 773 {
 774
 775   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 776   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 777   if (~0 != prev_range_bi)
 778     {
 779       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 780       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 781       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 782       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 783     }
 784   else
 785     {
 786       if (~0 != reass->first_bi)
 787         {
 788           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 789         }
 790       reass->first_bi = new_next_bi;
 791     }
 792   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 793 }
 794
 795 always_inline ip6_full_reass_rc_t
 796 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 797                        ip6_full_reass_main_t * rm,
 798                        ip6_full_reass_per_thread_t * rt,
 799                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 800                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 801                        bool is_custom_app, u32 * handoff_thread_idx)
 802 {
 803   int consumed = 0;
 804   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 805   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 806   if (is_custom_app)
 807     {
 808       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 809       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 810     }
 811
 812   fvnb->ip.reass.ip6_frag_hdr_offset =
 813     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 814   ip6_header_t *fip = vlib_buffer_get_current (fb);
 815   if (fb->current_length < sizeof (*fip) ||
 816       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 817       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 818     {
 819       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 820     }
 821
 822   u32 fragment_first = fvnb->ip.reass.fragment_first =
 823     ip6_frag_hdr_offset_bytes (frag_hdr);
 824   u32 fragment_length =
 825     vlib_buffer_length_in_chain (vm, fb) -
 826     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 827   u32 fragment_last = fvnb->ip.reass.fragment_last =
 828     fragment_first + fragment_length - 1;
 829   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 830   u32 candidate_range_bi = reass->first_bi;
 831   u32 prev_range_bi = ~0;
 832   fvnb->ip.reass.range_first = fragment_first;
 833   fvnb->ip.reass.range_last = fragment_last;
 834   fvnb->ip.reass.next_range_bi = ~0;
 835   if (!more_fragments)
 836     {
 837       reass->last_packet_octet = fragment_last;
 838     }
 839   if (~0 == reass->first_bi)
 840     {
 841       // starting a new reassembly
 842       ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 843                                             *bi0);
 844       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 845       consumed = 1;
 846       reass->fragments_n = 1;
 847       goto check_if_done_maybe;
 848     }
 849   reass->min_fragment_length =
 850     clib_min (clib_net_to_host_u16 (fip->payload_length),
 851               fvnb->ip.reass.estimated_mtu);
 852   while (~0 != candidate_range_bi)
 853     {
 854       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 855       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 856       if (fragment_first > candidate_vnb->ip.reass.range_last)
 857         {
 858           // this fragments starts after candidate range
 859           prev_range_bi = candidate_range_bi;
 860           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 861           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 862               ~0 == candidate_range_bi)
 863             {
 864               // special case - this fragment falls beyond all known ranges
 865               ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 866                                                     prev_range_bi, *bi0);
 867               consumed = 1;
 868               break;
 869             }
 870           continue;
 871         }
 872       if (fragment_last < candidate_vnb->ip.reass.range_first)
 873         {
 874           // this fragment ends before candidate range without any overlap
 875           ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 876                                                 prev_range_bi, *bi0);
 877           consumed = 1;
 878         }
 879       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 880                fragment_last == candidate_vnb->ip.reass.range_last)
 881         {
 882           // duplicate fragment - ignore
 883         }
 884       else
 885         {
 886           // overlapping fragment - not allowed by RFC 8200
 887           ip6_full_reass_drop_all (vm, node, rm, reass);
 888           ip6_full_reass_free (rm, rt, reass);
 889           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 890             {
 891               ip6_full_reass_add_trace (vm, node, rm, reass, *bi0,
 892                                         RANGE_OVERLAP, ~0);
 893             }
 894           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 895           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 896           return IP6_FULL_REASS_RC_OK;
 897         }
 898       break;
 899     }
 900   ++reass->fragments_n;
 901 check_if_done_maybe:
 902   if (consumed)
 903     {
 904       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 905         {
 906           ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, ~0);
 907         }
 908     }
 909   if (~0 != reass->last_packet_octet &&
 910       reass->data_len == reass->last_packet_octet + 1)
 911     {
 912       *handoff_thread_idx = reass->sendout_thread_index;
 913       ip6_full_reass_rc_t rc =
 914         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 915                                  is_custom_app);
 916       if (IP6_FULL_REASS_RC_OK == rc
 917           && reass->memory_owner_thread_index != reass->sendout_thread_index)
 918         {
 919           return IP6_FULL_REASS_RC_HANDOFF;
 920         }
 921       return rc;
 922     }
 923   else
 924     {
 925       if (consumed)
 926         {
 927           *bi0 = ~0;
 928           if (reass->fragments_n > rm->max_reass_len)
 929             {
 930               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 931             }
 932         }
 933       else
 934         {
 935           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 936           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 937         }
 938     }
 939   return IP6_FULL_REASS_RC_OK;
 940 }
 941
 942 always_inline bool
 943 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 944                                            vlib_buffer_t * b,
 945                                            ip6_frag_hdr_t * frag_hdr)
 946 {
 947   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 948   while (ip6_ext_hdr (tmp->next_hdr))
 949     {
 950       tmp = ip6_ext_next_header (tmp);
 951     }
 952   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 953     {
 954       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 955                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 956                                    0);
 957       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 958
 959       return false;
 960     }
 961   return true;
 962 }
 963
 964 always_inline bool
 965 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 966                                            vlib_node_runtime_t * node,
 967                                            vlib_buffer_t * b,
 968                                            ip6_frag_hdr_t * frag_hdr)
 969 {
 970   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 971   ip6_header_t *ip = vlib_buffer_get_current (b);
 972   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 973   u32 fragment_length =
 974     vlib_buffer_length_in_chain (vm, b) -
 975     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 976   if (more_fragments && 0 != fragment_length % 8)
 977     {
 978       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 979                                    ICMP6_parameter_problem_erroneous_header_field,
 980                                    (u8 *) & ip->payload_length - (u8 *) ip);
 981       return false;
 982     }
 983   return true;
 984 }
 985
 986 always_inline bool
 987 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 988                                           vlib_node_runtime_t * node,
 989                                           vlib_buffer_t * b,
 990                                           ip6_frag_hdr_t * frag_hdr)
 991 {
 992   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 993   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 994   u32 fragment_length =
 995     vlib_buffer_length_in_chain (vm, b) -
 996     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 997   if (fragment_first + fragment_length > 65535)
 998     {
 999       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1000       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1001                                    ICMP6_parameter_problem_erroneous_header_field,
1002                                    (u8 *) & frag_hdr->fragment_offset_and_more
1003                                    - (u8 *) ip0);
1004       return false;
1005     }
1006   return true;
1007 }
1008
1009 always_inline uword
1010 ip6_full_reassembly_inline (vlib_main_t * vm,
1011                             vlib_node_runtime_t * node,
1012                             vlib_frame_t * frame, bool is_feature,
1013                             bool is_custom_app)
1014 {
1015   u32 *from = vlib_frame_vector_args (frame);
1016   u32 n_left_from, n_left_to_next, *to_next, next_index;
1017   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1018   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1019   clib_spinlock_lock (&rt->lock);
1020
1021   n_left_from = frame->n_vectors;
1022   next_index = node->cached_next_index;
1023   while (n_left_from > 0)
1024     {
1025       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1026
1027       while (n_left_from > 0 && n_left_to_next > 0)
1028         {
1029           u32 bi0;
1030           vlib_buffer_t *b0;
1031           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1032           u32 error0 = IP6_ERROR_NONE;
1033           u32 icmp_bi = ~0;
1034
1035           bi0 = from[0];
1036           b0 = vlib_get_buffer (vm, bi0);
1037
1038           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1039           ip6_frag_hdr_t *frag_hdr = NULL;
1040           ip6_ext_header_t *prev_hdr;
1041           if (ip6_ext_hdr (ip0->protocol))
1042             {
1043               ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
1044                                      IP_PROTOCOL_IPV6_FRAGMENTATION);
1045             }
1046           if (!frag_hdr)
1047             {
1048               // this is a regular packet - no fragmentation
1049               next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1050               goto skip_reass;
1051             }
1052           if (0 == ip6_frag_hdr_offset (frag_hdr))
1053             {
1054               // first fragment - verify upper-layer is present
1055               if (!ip6_full_reass_verify_upper_layer_present
1056                   (node, b0, frag_hdr))
1057                 {
1058                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1059                   goto skip_reass;
1060                 }
1061             }
1062           if (!ip6_full_reass_verify_fragment_multiple_8
1063               (vm, node, b0, frag_hdr)
1064               || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
1065                                                             frag_hdr))
1066             {
1067               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1068               goto skip_reass;
1069             }
1070           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1071             (u8 *) frag_hdr - (u8 *) ip0;
1072
1073           ip6_full_reass_kv_t kv;
1074           u8 do_handoff = 0;
1075
1076           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1077           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1078           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1079           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1080           kv.k.as_u64[4] =
1081             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1082                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1083             (u64) frag_hdr->identification;
1084           kv.k.as_u64[5] = ip0->protocol;
1085
1086           ip6_full_reass_t *reass =
1087             ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1088                                            &do_handoff);
1089
1090           if (reass)
1091             {
1092               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1093               if (0 == fragment_first)
1094                 {
1095                   reass->sendout_thread_index = vm->thread_index;
1096                 }
1097             }
1098           if (PREDICT_FALSE (do_handoff))
1099             {
1100               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1101               if (is_feature)
1102                 vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1103                   kv.v.memory_owner_thread_index;
1104               else
1105                 vnet_buffer (b0)->ip.reass.owner_thread_index =
1106                   kv.v.memory_owner_thread_index;
1107             }
1108           else if (reass)
1109             {
1110               u32 handoff_thread_idx;
1111               switch (ip6_full_reass_update
1112                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1113                        frag_hdr, is_custom_app, &handoff_thread_idx))
1114                 {
1115                 case IP6_FULL_REASS_RC_OK:
1116                   /* nothing to do here */
1117                   break;
1118                 case IP6_FULL_REASS_RC_HANDOFF:
1119                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1120                   b0 = vlib_get_buffer (vm, bi0);
1121                   if (is_feature)
1122                     vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1123                       handoff_thread_idx;
1124                   else
1125                     vnet_buffer (b0)->ip.reass.owner_thread_index =
1126                       handoff_thread_idx;
1127                   break;
1128                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1129                   vlib_node_increment_counter (vm, node->node_index,
1130                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1131                                                1);
1132                   ip6_full_reass_drop_all (vm, node, rm, reass);
1133                   ip6_full_reass_free (rm, rt, reass);
1134                   goto next_packet;
1135                   break;
1136                 case IP6_FULL_REASS_RC_NO_BUF:
1137                   vlib_node_increment_counter (vm, node->node_index,
1138                                                IP6_ERROR_REASS_NO_BUF, 1);
1139                   ip6_full_reass_drop_all (vm, node, rm, reass);
1140                   ip6_full_reass_free (rm, rt, reass);
1141                   goto next_packet;
1142                   break;
1143                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1144                   vlib_node_increment_counter (vm, node->node_index,
1145                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1146                                                1);
1147                   ip6_full_reass_drop_all (vm, node, rm, reass);
1148                   ip6_full_reass_free (rm, rt, reass);
1149                   goto next_packet;
1150                   break;
1151                 }
1152             }
1153           else
1154             {
1155               if (is_feature)
1156                 {
1157                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1158                 }
1159               else
1160                 {
1161                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1162                   next0 = fvnb->ip.reass.error_next_index;
1163                 }
1164               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1165             }
1166
1167           b0->error = node->errors[error0];
1168
1169           if (~0 != bi0)
1170             {
1171             skip_reass:
1172               to_next[0] = bi0;
1173               to_next += 1;
1174               n_left_to_next -= 1;
1175               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1176                 {
1177                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1178                     {
1179                       if (is_feature)
1180                         ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1181                                                   HANDOFF,
1182                                                   vnet_buffer (b0)->ip.
1183                                                   reass.owner_feature_thread_index);
1184                       else
1185                         ip6_full_reass_add_trace (vm, node, rm, NULL, bi0,
1186                                                   HANDOFF,
1187                                                   vnet_buffer (b0)->ip.
1188                                                   reass.owner_thread_index);
1189                     }
1190                 }
1191               else if (is_feature && IP6_ERROR_NONE == error0)
1192                 {
1193                   b0 = vlib_get_buffer (vm, bi0);
1194                   vnet_feature_next (&next0, b0);
1195                 }
1196               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1197                                                n_left_to_next, bi0, next0);
1198             }
1199
1200           if (~0 != icmp_bi)
1201             {
1202               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1203               to_next[0] = icmp_bi;
1204               to_next += 1;
1205               n_left_to_next -= 1;
1206               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1207                                                n_left_to_next, icmp_bi,
1208                                                next0);
1209             }
1210         next_packet:
1211           from += 1;
1212           n_left_from -= 1;
1213         }
1214
1215       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1216     }
1217
1218   clib_spinlock_unlock (&rt->lock);
1219   return frame->n_vectors;
1220 }
1221
1222 static char *ip6_full_reassembly_error_strings[] = {
1223 #define _(sym, string) string,
1224   foreach_ip6_error
1225 #undef _
1226 };
1227
1228 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1229                                     vlib_node_runtime_t * node,
1230                                     vlib_frame_t * frame)
1231 {
1232   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1233                                      false /* is_custom_app */ );
1234 }
1235
1236 /* *INDENT-OFF* */
1237 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1238     .name = "ip6-full-reassembly",
1239     .vector_size = sizeof (u32),
1240     .format_trace = format_ip6_full_reass_trace,
1241     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1242     .error_strings = ip6_full_reassembly_error_strings,
1243     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1244     .next_nodes =
1245         {
1246                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1247                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1248                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1249                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1250         },
1251 };
1252 /* *INDENT-ON* */
1253
1254 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1255                                             vlib_node_runtime_t * node,
1256                                             vlib_frame_t * frame)
1257 {
1258   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1259                                      false /* is_custom_app */ );
1260 }
1261
1262 /* *INDENT-OFF* */
1263 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1264     .name = "ip6-full-reassembly-feature",
1265     .vector_size = sizeof (u32),
1266     .format_trace = format_ip6_full_reass_trace,
1267     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1268     .error_strings = ip6_full_reassembly_error_strings,
1269     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1270     .next_nodes =
1271         {
1272                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1273                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1274                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1275                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1276         },
1277 };
1278 /* *INDENT-ON* */
1279
1280 /* *INDENT-OFF* */
1281 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1282     .arc_name = "ip6-unicast",
1283     .node_name = "ip6-full-reassembly-feature",
1284     .runs_before = VNET_FEATURES ("ip6-lookup",
1285                                   "ipsec6-input-feature"),
1286     .runs_after = 0,
1287 };
1288 /* *INDENT-ON* */
1289
1290 #ifndef CLIB_MARCH_VARIANT
1291 static u32
1292 ip6_full_reass_get_nbuckets ()
1293 {
1294   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1295   u32 nbuckets;
1296   u8 i;
1297
1298   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1299
1300   for (i = 0; i < 31; i++)
1301     if ((1 << i) >= nbuckets)
1302       break;
1303   nbuckets = 1 << i;
1304
1305   return nbuckets;
1306 }
1307 #endif /* CLIB_MARCH_VARIANT */
1308
1309 typedef enum
1310 {
1311   IP6_EVENT_CONFIG_CHANGED = 1,
1312 } ip6_full_reass_event_t;
1313
1314 #ifndef CLIB_MARCH_VARIANT
1315 typedef struct
1316 {
1317   int failure;
1318   clib_bihash_48_8_t *new_hash;
1319 } ip6_rehash_cb_ctx;
1320
1321 static void
1322 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1323 {
1324   ip6_rehash_cb_ctx *ctx = _ctx;
1325   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1326     {
1327       ctx->failure = 1;
1328     }
1329 }
1330
1331 static void
1332 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1333                            u32 max_reassembly_length,
1334                            u32 expire_walk_interval_ms)
1335 {
1336   ip6_full_reass_main.timeout_ms = timeout_ms;
1337   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1338   ip6_full_reass_main.max_reass_n = max_reassemblies;
1339   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1340   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1341 }
1342
1343 vnet_api_error_t
1344 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1345                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1346 {
1347   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1348   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1349                              max_reassembly_length, expire_walk_interval_ms);
1350   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1351                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1352                              IP6_EVENT_CONFIG_CHANGED, 0);
1353   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1354   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1355     {
1356       clib_bihash_48_8_t new_hash;
1357       clib_memset (&new_hash, 0, sizeof (new_hash));
1358       ip6_rehash_cb_ctx ctx;
1359       ctx.failure = 0;
1360       ctx.new_hash = &new_hash;
1361       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1362                              new_nbuckets * 1024);
1363       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1364                                                ip6_rehash_cb, &ctx);
1365       if (ctx.failure)
1366         {
1367           clib_bihash_free_48_8 (&new_hash);
1368           return -1;
1369         }
1370       else
1371         {
1372           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1373           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1374                             sizeof (ip6_full_reass_main.hash));
1375           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1376         }
1377     }
1378   return 0;
1379 }
1380
1381 vnet_api_error_t
1382 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1383                     u32 * max_reassembly_length,
1384                     u32 * expire_walk_interval_ms)
1385 {
1386   *timeout_ms = ip6_full_reass_main.timeout_ms;
1387   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1388   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1389   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1390   return 0;
1391 }
1392
1393 static clib_error_t *
1394 ip6_full_reass_init_function (vlib_main_t * vm)
1395 {
1396   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1397   clib_error_t *error = 0;
1398   u32 nbuckets;
1399   vlib_node_t *node;
1400
1401   rm->vlib_main = vm;
1402
1403   vec_validate (rm->per_thread_data, vlib_num_workers ());
1404   ip6_full_reass_per_thread_t *rt;
1405   vec_foreach (rt, rm->per_thread_data)
1406   {
1407     clib_spinlock_init (&rt->lock);
1408     pool_alloc (rt->pool, rm->max_reass_n);
1409   }
1410
1411   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1412   ASSERT (node);
1413   rm->ip6_full_reass_expire_node_idx = node->index;
1414
1415   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1416                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1417                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1418                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1419
1420   nbuckets = ip6_full_reass_get_nbuckets ();
1421   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1422                          nbuckets * 1024);
1423
1424   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1425   ASSERT (node);
1426   rm->ip6_drop_idx = node->index;
1427   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1428   ASSERT (node);
1429   rm->ip6_icmp_error_idx = node->index;
1430
1431   if ((error = vlib_call_init_function (vm, ip_main_init)))
1432     return error;
1433   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1434                          ip6_full_reass_node.index);
1435
1436   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1437   rm->fq_feature_index =
1438     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1439
1440   return error;
1441 }
1442
1443 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1444 #endif /* CLIB_MARCH_VARIANT */
1445
1446 static uword
1447 ip6_full_reass_walk_expired (vlib_main_t * vm,
1448                              vlib_node_runtime_t * node, vlib_frame_t * f)
1449 {
1450   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1451   uword event_type, *event_data = 0;
1452
1453   while (true)
1454     {
1455       vlib_process_wait_for_event_or_clock (vm,
1456                                             (f64) rm->expire_walk_interval_ms
1457                                             / (f64) MSEC_PER_SEC);
1458       event_type = vlib_process_get_events (vm, &event_data);
1459
1460       switch (event_type)
1461         {
1462         case ~0:                /* no events => timeout */
1463           /* nothing to do here */
1464           break;
1465         case IP6_EVENT_CONFIG_CHANGED:
1466           break;
1467         default:
1468           clib_warning ("BUG: event type 0x%wx", event_type);
1469           break;
1470         }
1471       f64 now = vlib_time_now (vm);
1472
1473       ip6_full_reass_t *reass;
1474       int *pool_indexes_to_free = NULL;
1475
1476       uword thread_index = 0;
1477       int index;
1478       const uword nthreads = vlib_num_workers () + 1;
1479       u32 *vec_icmp_bi = NULL;
1480       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1481         {
1482           ip6_full_reass_per_thread_t *rt =
1483             &rm->per_thread_data[thread_index];
1484           clib_spinlock_lock (&rt->lock);
1485
1486           vec_reset_length (pool_indexes_to_free);
1487           /* *INDENT-OFF* */
1488           pool_foreach_index (index, rt->pool, ({
1489                                 reass = pool_elt_at_index (rt->pool, index);
1490                                 if (now > reass->last_heard + rm->timeout)
1491                                   {
1492                                     vec_add1 (pool_indexes_to_free, index);
1493                                   }
1494                               }));
1495           /* *INDENT-ON* */
1496           int *i;
1497           /* *INDENT-OFF* */
1498           vec_foreach (i, pool_indexes_to_free)
1499           {
1500             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1501             u32 icmp_bi = ~0;
1502             ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1503             if (~0 != icmp_bi)
1504               vec_add1 (vec_icmp_bi, icmp_bi);
1505
1506             ip6_full_reass_free (rm, rt, reass);
1507           }
1508           /* *INDENT-ON* */
1509
1510           clib_spinlock_unlock (&rt->lock);
1511         }
1512
1513       while (vec_len (vec_icmp_bi) > 0)
1514         {
1515           vlib_frame_t *f =
1516             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1517           u32 *to_next = vlib_frame_vector_args (f);
1518           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1519           int trace_frame = 0;
1520           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1521             {
1522               u32 bi = vec_pop (vec_icmp_bi);
1523               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1524               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1525                 trace_frame = 1;
1526               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1527               to_next[0] = bi;
1528               ++f->n_vectors;
1529               to_next += 1;
1530               n_left_to_next -= 1;
1531             }
1532           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1533           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1534         }
1535
1536       vec_free (pool_indexes_to_free);
1537       vec_free (vec_icmp_bi);
1538       if (event_data)
1539         {
1540           _vec_len (event_data) = 0;
1541         }
1542     }
1543
1544   return 0;
1545 }
1546
1547 /* *INDENT-OFF* */
1548 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1549     .function = ip6_full_reass_walk_expired,
1550     .format_trace = format_ip6_full_reass_trace,
1551     .type = VLIB_NODE_TYPE_PROCESS,
1552     .name = "ip6-full-reassembly-expire-walk",
1553
1554     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1555     .error_strings = ip6_full_reassembly_error_strings,
1556
1557 };
1558 /* *INDENT-ON* */
1559
1560 static u8 *
1561 format_ip6_full_reass_key (u8 * s, va_list * args)
1562 {
1563   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1564   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1565               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1566               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1567   return s;
1568 }
1569
1570 static u8 *
1571 format_ip6_full_reass (u8 * s, va_list * args)
1572 {
1573   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1574   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1575
1576   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1577               "last_packet_octet: %u, trace_op_counter: %u\n",
1578               reass->id, format_ip6_full_reass_key, &reass->key,
1579               reass->first_bi, reass->data_len, reass->last_packet_octet,
1580               reass->trace_op_counter);
1581   u32 bi = reass->first_bi;
1582   u32 counter = 0;
1583   while (~0 != bi)
1584     {
1585       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1586       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1587       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1588                   "fragment[%u, %u]\n",
1589                   counter, vnb->ip.reass.range_first,
1590                   vnb->ip.reass.range_last, bi,
1591                   ip6_full_reass_buffer_get_data_offset (b),
1592                   ip6_full_reass_buffer_get_data_len (b),
1593                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1594       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1595         {
1596           bi = b->next_buffer;
1597         }
1598       else
1599         {
1600           bi = ~0;
1601         }
1602     }
1603   return s;
1604 }
1605
1606 static clib_error_t *
1607 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1608                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1609 {
1610   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1611
1612   vlib_cli_output (vm, "---------------------");
1613   vlib_cli_output (vm, "IP6 reassembly status");
1614   vlib_cli_output (vm, "---------------------");
1615   bool details = false;
1616   if (unformat (input, "details"))
1617     {
1618       details = true;
1619     }
1620
1621   u32 sum_reass_n = 0;
1622   u64 sum_buffers_n = 0;
1623   ip6_full_reass_t *reass;
1624   uword thread_index;
1625   const uword nthreads = vlib_num_workers () + 1;
1626   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1627     {
1628       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1629       clib_spinlock_lock (&rt->lock);
1630       if (details)
1631         {
1632           /* *INDENT-OFF* */
1633           pool_foreach (reass, rt->pool, {
1634             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1635           });
1636           /* *INDENT-ON* */
1637         }
1638       sum_reass_n += rt->reass_n;
1639       clib_spinlock_unlock (&rt->lock);
1640     }
1641   vlib_cli_output (vm, "---------------------");
1642   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1643                    (long unsigned) sum_reass_n);
1644   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1645                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1646   vlib_cli_output (vm, "Buffers in use: %lu\n",
1647                    (long unsigned) sum_buffers_n);
1648   return 0;
1649 }
1650
1651 /* *INDENT-OFF* */
1652 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1653     .path = "show ip6-full-reassembly",
1654     .short_help = "show ip6-full-reassembly [details]",
1655     .function = show_ip6_full_reass,
1656 };
1657 /* *INDENT-ON* */
1658
1659 #ifndef CLIB_MARCH_VARIANT
1660 vnet_api_error_t
1661 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1662 {
1663   return vnet_feature_enable_disable ("ip6-unicast",
1664                                       "ip6-full-reassembly-feature",
1665                                       sw_if_index, enable_disable, 0, 0);
1666 }
1667 #endif /* CLIB_MARCH_VARIANT */
1668
1669 #define foreach_ip6_full_reassembly_handoff_error                       \
1670 _(CONGESTION_DROP, "congestion drop")
1671
1672
1673 typedef enum
1674 {
1675 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1676   foreach_ip6_full_reassembly_handoff_error
1677 #undef _
1678     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1679 } ip6_full_reassembly_handoff_error_t;
1680
1681 static char *ip6_full_reassembly_handoff_error_strings[] = {
1682 #define _(sym,string) string,
1683   foreach_ip6_full_reassembly_handoff_error
1684 #undef _
1685 };
1686
1687 typedef struct
1688 {
1689   u32 next_worker_index;
1690 } ip6_full_reassembly_handoff_trace_t;
1691
1692 static u8 *
1693 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1694 {
1695   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1696   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1697   ip6_full_reassembly_handoff_trace_t *t =
1698     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1699
1700   s =
1701     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1702             t->next_worker_index);
1703
1704   return s;
1705 }
1706
1707 always_inline uword
1708 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1709                                     vlib_node_runtime_t * node,
1710                                     vlib_frame_t * frame, bool is_feature)
1711 {
1712   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1713
1714   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1715   u32 n_enq, n_left_from, *from;
1716   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1717   u32 fq_index;
1718
1719   from = vlib_frame_vector_args (frame);
1720   n_left_from = frame->n_vectors;
1721   vlib_get_buffers (vm, from, bufs, n_left_from);
1722
1723   b = bufs;
1724   ti = thread_indices;
1725
1726   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1727
1728   while (n_left_from > 0)
1729     {
1730       ti[0] =
1731         (is_feature) ? vnet_buffer (b[0])->ip.
1732         reass.owner_feature_thread_index : vnet_buffer (b[0])->ip.
1733         reass.owner_thread_index;
1734
1735       if (PREDICT_FALSE
1736           ((node->flags & VLIB_NODE_FLAG_TRACE)
1737            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1738         {
1739           ip6_full_reassembly_handoff_trace_t *t =
1740             vlib_add_trace (vm, node, b[0], sizeof (*t));
1741           t->next_worker_index = ti[0];
1742         }
1743
1744       n_left_from -= 1;
1745       ti += 1;
1746       b += 1;
1747     }
1748   n_enq =
1749     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1750                                    frame->n_vectors, 1);
1751
1752   if (n_enq < frame->n_vectors)
1753     vlib_node_increment_counter (vm, node->node_index,
1754                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1755                                  frame->n_vectors - n_enq);
1756   return frame->n_vectors;
1757 }
1758
1759 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1760                                                  vlib_node_runtime_t * node,
1761                                                  vlib_frame_t * frame)
1762 {
1763   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1764                                              false /* is_feature */ );
1765 }
1766
1767 /* *INDENT-OFF* */
1768 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1769   .name = "ip6-full-reassembly-handoff",
1770   .vector_size = sizeof (u32),
1771   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1772   .error_strings = ip6_full_reassembly_handoff_error_strings,
1773   .format_trace = format_ip6_full_reassembly_handoff_trace,
1774
1775   .n_next_nodes = 1,
1776
1777   .next_nodes = {
1778     [0] = "error-drop",
1779   },
1780 };
1781
1782
1783 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1784                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1785 {
1786   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1787 }
1788
1789
1790 /* *INDENT-OFF* */
1791 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1792   .name = "ip6-full-reass-feature-hoff",
1793   .vector_size = sizeof (u32),
1794   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1795   .error_strings = ip6_full_reassembly_handoff_error_strings,
1796   .format_trace = format_ip6_full_reassembly_handoff_trace,
1797
1798   .n_next_nodes = 1,
1799
1800   .next_nodes = {
1801     [0] = "error-drop",
1802   },
1803 };
1804 /* *INDENT-ON* */
1805
1806 /*
1807  * fd.io coding-style-patch-verification: ON
1808  *
1809  * Local Variables:
1810  * eval: (c-set-style "gnu")
1811  * End:
1812  */