src/vnet/ip/ip6_reassembly.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 Reassembly.
  19  *
  20  * This file contains the source code for IPv6 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/ip6_reassembly.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  32 #define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  33 #define IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  34 #define IP6_REASS_HT_LOAD_FACTOR (0.75)
  35
  36 typedef enum
  37 {
  38   IP6_REASS_RC_OK,
  39   IP6_REASS_RC_INTERNAL_ERROR,
  40   IP6_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_REASS_RC_NO_BUF,
  42   IP6_REASS_RC_HANDOFF,
  43 } ip6_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_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_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_reass_key_t k;
  77     ip6_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_reass_kv_t;
  81
  82
  83 always_inline u32
  84 ip6_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_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 + ip6_reass_buffer_get_data_offset (b)) + 1;
  96 }
  97
  98 typedef struct
  99 {
 100   // hash table key
 101   ip6_reass_key_t key;
 102   // time when last packet was received
 103   f64 last_heard;
 104   // internal id of this reassembly
 105   u64 id;
 106   // buffer index of first buffer in this reassembly context
 107   u32 first_bi;
 108   // last octet of packet, ~0 until fragment without more_fragments arrives
 109   u32 last_packet_octet;
 110   // length of data collected so far
 111   u32 data_len;
 112   // trace operation counter
 113   u32 trace_op_counter;
 114   // next index - used by custom apps (~0 if not set)
 115   u32 next_index;
 116   // error next index - used by custom apps (~0 if not set)
 117   u32 error_next_index;
 118   // minimum fragment length for this reassembly - used to estimate MTU
 119   u16 min_fragment_length;
 120   // number of fragments for this reassembly
 121   u32 fragments_n;
 122   // thread owning memory for this context (whose pool contains this ctx)
 123   u32 memory_owner_thread_index;
 124   // thread which received fragment with offset 0 and which sends out the
 125   // completed reassembly
 126   u32 sendout_thread_index;
 127 } ip6_reass_t;
 128
 129 typedef struct
 130 {
 131   ip6_reass_t *pool;
 132   u32 reass_n;
 133   u32 id_counter;
 134   clib_spinlock_t lock;
 135 } ip6_reass_per_thread_t;
 136
 137 typedef struct
 138 {
 139   // IPv6 config
 140   u32 timeout_ms;
 141   f64 timeout;
 142   u32 expire_walk_interval_ms;
 143   // maximum number of fragments in one reassembly
 144   u32 max_reass_len;
 145   // maximum number of reassemblies
 146   u32 max_reass_n;
 147
 148   // IPv6 runtime
 149   clib_bihash_48_8_t hash;
 150
 151   // per-thread data
 152   ip6_reass_per_thread_t *per_thread_data;
 153
 154   // convenience
 155   vlib_main_t *vlib_main;
 156
 157   // node index of ip6-drop node
 158   u32 ip6_drop_idx;
 159   u32 ip6_icmp_error_idx;
 160   u32 ip6_reass_expire_node_idx;
 161
 162   /** Worker handoff */
 163   u32 fq_index;
 164   u32 fq_feature_index;
 165
 166 } ip6_reass_main_t;
 167
 168 extern ip6_reass_main_t ip6_reass_main;
 169
 170 #ifndef CLIB_MARCH_VARIANT
 171 ip6_reass_main_t ip6_reass_main;
 172 #endif /* CLIB_MARCH_VARIANT */
 173
 174 typedef enum
 175 {
 176   IP6_REASSEMBLY_NEXT_INPUT,
 177   IP6_REASSEMBLY_NEXT_DROP,
 178   IP6_REASSEMBLY_NEXT_ICMP_ERROR,
 179   IP6_REASSEMBLY_NEXT_HANDOFF,
 180   IP6_REASSEMBLY_N_NEXT,
 181 } ip6_reass_next_t;
 182
 183 typedef enum
 184 {
 185   RANGE_NEW,
 186   RANGE_OVERLAP,
 187   ICMP_ERROR_RT_EXCEEDED,
 188   ICMP_ERROR_FL_TOO_BIG,
 189   ICMP_ERROR_FL_NOT_MULT_8,
 190   FINALIZE,
 191   HANDOFF,
 192 } ip6_reass_trace_operation_e;
 193
 194 typedef struct
 195 {
 196   u16 range_first;
 197   u16 range_last;
 198   u32 range_bi;
 199   i32 data_offset;
 200   u32 data_len;
 201   u32 first_bi;
 202 } ip6_reass_range_trace_t;
 203
 204 typedef struct
 205 {
 206   ip6_reass_trace_operation_e action;
 207   u32 reass_id;
 208   ip6_reass_range_trace_t trace_range;
 209   u32 op_id;
 210   u32 fragment_first;
 211   u32 fragment_last;
 212   u32 total_data_len;
 213   u32 thread_id;
 214   u32 thread_id_to;
 215 } ip6_reass_trace_t;
 216
 217 static void
 218 ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
 219                          ip6_reass_range_trace_t * trace)
 220 {
 221   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 222   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 223   trace->range_first = vnb->ip.reass.range_first;
 224   trace->range_last = vnb->ip.reass.range_last;
 225   trace->data_offset = ip6_reass_buffer_get_data_offset (b);
 226   trace->data_len = ip6_reass_buffer_get_data_len (b);
 227   trace->range_bi = bi;
 228 }
 229
 230 static u8 *
 231 format_ip6_reass_range_trace (u8 * s, va_list * args)
 232 {
 233   ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
 234   s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 235               trace->range_last, trace->data_offset, trace->data_len,
 236               trace->range_bi);
 237   return s;
 238 }
 239
 240 static u8 *
 241 format_ip6_reass_trace (u8 * s, va_list * args)
 242 {
 243   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 244   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 245   ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
 246   u32 indent = 0;
 247   if (~0 != t->reass_id)
 248     {
 249       s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
 250       indent = format_get_indent (s);
 251       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 252                   t->trace_range.first_bi, t->total_data_len,
 253                   t->fragment_first, t->fragment_last);
 254     }
 255   switch (t->action)
 256     {
 257     case RANGE_NEW:
 258       s = format (s, "\n%Unew %U", format_white_space, indent,
 259                   format_ip6_reass_range_trace, &t->trace_range);
 260       break;
 261     case RANGE_OVERLAP:
 262       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 263                   format_ip6_reass_range_trace, &t->trace_range);
 264       break;
 265     case ICMP_ERROR_FL_TOO_BIG:
 266       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 267                   format_white_space, indent, format_ip6_reass_range_trace,
 268                   &t->trace_range);
 269       break;
 270     case ICMP_ERROR_FL_NOT_MULT_8:
 271       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 272                   format_white_space, indent, format_ip6_reass_range_trace,
 273                   &t->trace_range);
 274       break;
 275     case ICMP_ERROR_RT_EXCEEDED:
 276       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 277                   format_white_space, indent);
 278       break;
 279     case FINALIZE:
 280       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 281       break;
 282     case HANDOFF:
 283       s =
 284         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 285                 t->thread_id_to);
 286       break;
 287     }
 288   return s;
 289 }
 290
 291 static void
 292 ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 293                      ip6_reass_main_t * rm, u32 reass_id, u32 op_id,
 294                      u32 bi, u32 first_bi, u32 data_len,
 295                      ip6_reass_trace_operation_e action, u32 thread_id_to)
 296 {
 297   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 298   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 299   ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 300   t->reass_id = reass_id;
 301   t->action = action;
 302   ip6_reass_trace_details (vm, bi, &t->trace_range);
 303   t->op_id = op_id;
 304   t->thread_id = vm->thread_index;
 305   t->thread_id_to = thread_id_to;
 306   t->fragment_first = vnb->ip.reass.fragment_first;
 307   t->fragment_last = vnb->ip.reass.fragment_last;
 308   t->trace_range.first_bi = first_bi;
 309   t->total_data_len = data_len;
 310 #if 0
 311   static u8 *s = NULL;
 312   s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
 313   printf ("%.*s\n", vec_len (s), s);
 314   fflush (stdout);
 315   vec_reset_length (s);
 316 #endif
 317 }
 318
 319 always_inline void
 320 ip6_reass_free_ctx (ip6_reass_per_thread_t * rt, ip6_reass_t * reass)
 321 {
 322   pool_put (rt->pool, reass);
 323   --rt->reass_n;
 324 }
 325
 326 always_inline void
 327 ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 328                 ip6_reass_t * reass)
 329 {
 330   clib_bihash_kv_48_8_t kv;
 331   kv.key[0] = reass->key.as_u64[0];
 332   kv.key[1] = reass->key.as_u64[1];
 333   kv.key[2] = reass->key.as_u64[2];
 334   kv.key[3] = reass->key.as_u64[3];
 335   kv.key[4] = reass->key.as_u64[4];
 336   kv.key[5] = reass->key.as_u64[5];
 337   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 338   ip6_reass_free_ctx (rt, reass);
 339 }
 340
 341 always_inline void
 342 ip6_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 343                     ip6_reass_main_t * rm, ip6_reass_t * reass)
 344 {
 345   u32 range_bi = reass->first_bi;
 346   vlib_buffer_t *range_b;
 347   vnet_buffer_opaque_t *range_vnb;
 348   u32 *to_free = NULL;
 349   while (~0 != range_bi)
 350     {
 351       range_b = vlib_get_buffer (vm, range_bi);
 352       range_vnb = vnet_buffer (range_b);
 353       u32 bi = range_bi;
 354       while (~0 != bi)
 355         {
 356           vec_add1 (to_free, bi);
 357           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 358           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 359             {
 360               bi = b->next_buffer;
 361               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 362             }
 363           else
 364             {
 365               bi = ~0;
 366             }
 367         }
 368       range_bi = range_vnb->ip.reass.next_range_bi;
 369     }
 370   /* send to next_error_index */
 371   if (~0 != reass->error_next_index)
 372     {
 373       u32 n_left_to_next, *to_next, next_index;
 374
 375       next_index = reass->error_next_index;
 376       u32 bi = ~0;
 377
 378       while (vec_len (to_free) > 0)
 379         {
 380           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 381
 382           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 383             {
 384               bi = vec_pop (to_free);
 385
 386               if (~0 != bi)
 387                 {
 388                   to_next[0] = bi;
 389                   to_next += 1;
 390                   n_left_to_next -= 1;
 391                 }
 392             }
 393           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 394         }
 395     }
 396   else
 397     {
 398       vlib_buffer_free (vm, to_free, vec_len (to_free));
 399     }
 400   vec_free (to_free);
 401 }
 402
 403 always_inline void
 404 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 405                       ip6_reass_main_t * rm, ip6_reass_t * reass,
 406                       u32 * icmp_bi)
 407 {
 408   if (~0 == reass->first_bi)
 409     {
 410       return;
 411     }
 412   if (~0 == reass->next_index)  // custom apps don't want icmp
 413     {
 414       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 415       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 416         {
 417           *icmp_bi = reass->first_bi;
 418           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 419             {
 420               ip6_reass_add_trace (vm, node, rm, reass->id,
 421                                    reass->trace_op_counter, reass->first_bi,
 422                                    reass->first_bi, reass->data_len,
 423                                    ICMP_ERROR_RT_EXCEEDED, ~0);
 424               ++reass->trace_op_counter;
 425             }
 426           // fragment with offset zero received - send icmp message back
 427           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 428             {
 429               // separate first buffer from chain and steer it towards icmp node
 430               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 431               reass->first_bi = b->next_buffer;
 432             }
 433           else
 434             {
 435               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 436             }
 437           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 438                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 439                                        0);
 440         }
 441     }
 442   ip6_reass_drop_all (vm, node, rm, reass);
 443 }
 444
 445 always_inline ip6_reass_t *
 446 ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 447                           ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 448                           ip6_reass_kv_t * kv, u32 * icmp_bi, u8 * do_handoff)
 449 {
 450   ip6_reass_t *reass;
 451   f64 now;
 452
 453 again:
 454
 455   reass = NULL;
 456   now = vlib_time_now (vm);
 457
 458   if (!clib_bihash_search_48_8
 459       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 460     {
 461       reass =
 462         pool_elt_at_index (rm->per_thread_data
 463                            [kv->v.memory_owner_thread_index].pool,
 464                            kv->v.reass_index);
 465       if (vm->thread_index != kv->v.memory_owner_thread_index)
 466         {
 467           *do_handoff = 1;
 468           return reass;
 469         }
 470
 471       if (now > reass->last_heard + rm->timeout)
 472         {
 473           ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 474           ip6_reass_free (rm, rt, reass);
 475           reass = NULL;
 476         }
 477     }
 478
 479   if (reass)
 480     {
 481       reass->last_heard = now;
 482       return reass;
 483     }
 484
 485   if (rt->reass_n >= rm->max_reass_n)
 486     {
 487       reass = NULL;
 488       return reass;
 489     }
 490   else
 491     {
 492       pool_get (rt->pool, reass);
 493       clib_memset (reass, 0, sizeof (*reass));
 494       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 495       ++rt->id_counter;
 496       reass->first_bi = ~0;
 497       reass->last_packet_octet = ~0;
 498       reass->data_len = 0;
 499       reass->next_index = ~0;
 500       reass->error_next_index = ~0;
 501       ++rt->reass_n;
 502     }
 503
 504   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 505   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 506   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 507   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 508   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 509   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 510   kv->v.reass_index = (reass - rt->pool);
 511   kv->v.memory_owner_thread_index = vm->thread_index;
 512   reass->last_heard = now;
 513
 514   int rv =
 515     clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
 516   if (rv)
 517     {
 518       ip6_reass_free_ctx (rt, reass);
 519       reass = NULL;
 520       // if other worker created a context already work with the other copy
 521       if (-2 == rv)
 522         goto again;
 523     }
 524
 525   return reass;
 526 }
 527
 528 always_inline ip6_reass_rc_t
 529 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 530                     ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 531                     ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
 532                     bool is_custom_app)
 533 {
 534   *bi0 = reass->first_bi;
 535   *error0 = IP6_ERROR_NONE;
 536   ip6_frag_hdr_t *frag_hdr;
 537   vlib_buffer_t *last_b = NULL;
 538   u32 sub_chain_bi = reass->first_bi;
 539   u32 total_length = 0;
 540   u32 buf_cnt = 0;
 541   u32 dropped_cnt = 0;
 542   u32 *vec_drop_compress = NULL;
 543   ip6_reass_rc_t rv = IP6_REASS_RC_OK;
 544   do
 545     {
 546       u32 tmp_bi = sub_chain_bi;
 547       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 548       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 549       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 550           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 551         {
 552           rv = IP6_REASS_RC_INTERNAL_ERROR;
 553           goto free_buffers_and_return;
 554         }
 555
 556       u32 data_len = ip6_reass_buffer_get_data_len (tmp);
 557       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 558         sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
 559       u32 trim_end =
 560         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 561       if (tmp_bi == reass->first_bi)
 562         {
 563           /* first buffer - keep ip6 header */
 564           if (0 != ip6_reass_buffer_get_data_offset (tmp))
 565             {
 566               rv = IP6_REASS_RC_INTERNAL_ERROR;
 567               goto free_buffers_and_return;
 568             }
 569           trim_front = 0;
 570           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 571             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 572              sizeof (*frag_hdr));
 573           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 574             {
 575               rv = IP6_REASS_RC_INTERNAL_ERROR;
 576               goto free_buffers_and_return;
 577             }
 578         }
 579       u32 keep_data =
 580         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 581       while (1)
 582         {
 583           ++buf_cnt;
 584           if (trim_front)
 585             {
 586               if (trim_front > tmp->current_length)
 587                 {
 588                   /* drop whole buffer */
 589                   vec_add1 (vec_drop_compress, tmp_bi);
 590                   trim_front -= tmp->current_length;
 591                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 592                     {
 593                       rv = IP6_REASS_RC_INTERNAL_ERROR;
 594                       goto free_buffers_and_return;
 595                     }
 596                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 597                   tmp_bi = tmp->next_buffer;
 598                   tmp = vlib_get_buffer (vm, tmp_bi);
 599                   continue;
 600                 }
 601               else
 602                 {
 603                   vlib_buffer_advance (tmp, trim_front);
 604                   trim_front = 0;
 605                 }
 606             }
 607           if (keep_data)
 608             {
 609               if (last_b)
 610                 {
 611                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 612                   last_b->next_buffer = tmp_bi;
 613                 }
 614               last_b = tmp;
 615               if (keep_data <= tmp->current_length)
 616                 {
 617                   tmp->current_length = keep_data;
 618                   keep_data = 0;
 619                 }
 620               else
 621                 {
 622                   keep_data -= tmp->current_length;
 623                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 624                     {
 625                       rv = IP6_REASS_RC_INTERNAL_ERROR;
 626                       goto free_buffers_and_return;
 627                     }
 628                 }
 629               total_length += tmp->current_length;
 630             }
 631           else
 632             {
 633               vec_add1 (vec_drop_compress, tmp_bi);
 634               if (reass->first_bi == tmp_bi)
 635                 {
 636                   rv = IP6_REASS_RC_INTERNAL_ERROR;
 637                   goto free_buffers_and_return;
 638                 }
 639               ++dropped_cnt;
 640             }
 641           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 642             {
 643               tmp_bi = tmp->next_buffer;
 644               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 645             }
 646           else
 647             {
 648               break;
 649             }
 650         }
 651       sub_chain_bi =
 652         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 653         reass.next_range_bi;
 654     }
 655   while (~0 != sub_chain_bi);
 656
 657   if (!last_b)
 658     {
 659       rv = IP6_REASS_RC_INTERNAL_ERROR;
 660       goto free_buffers_and_return;
 661     }
 662   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 663   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 664   if (total_length < first_b->current_length)
 665     {
 666       rv = IP6_REASS_RC_INTERNAL_ERROR;
 667       goto free_buffers_and_return;
 668     }
 669   total_length -= first_b->current_length;
 670   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 671   first_b->total_length_not_including_first_buffer = total_length;
 672   // drop fragment header
 673   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 674   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 675   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 676   ip6_ext_header_t *prev_hdr;
 677   ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
 678                          IP_PROTOCOL_IPV6_FRAGMENTATION);
 679   if (prev_hdr)
 680     {
 681       prev_hdr->next_hdr = frag_hdr->next_hdr;
 682     }
 683   else
 684     {
 685       ip->protocol = frag_hdr->next_hdr;
 686     }
 687   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 688     {
 689       rv = IP6_REASS_RC_INTERNAL_ERROR;
 690       goto free_buffers_and_return;
 691     }
 692   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 693            first_b->current_length - ip6_frag_hdr_offset -
 694            sizeof (ip6_frag_hdr_t));
 695   first_b->current_length -= sizeof (*frag_hdr);
 696   ip->payload_length =
 697     clib_host_to_net_u16 (total_length + first_b->current_length -
 698                           sizeof (*ip));
 699   if (!vlib_buffer_chain_linearize (vm, first_b))
 700     {
 701       rv = IP6_REASS_RC_NO_BUF;
 702       goto free_buffers_and_return;
 703     }
 704   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 705   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 706     {
 707       ip6_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter,
 708                            reass->first_bi, reass->first_bi, reass->data_len,
 709                            FINALIZE, ~0);
 710       ++reass->trace_op_counter;
 711 #if 0
 712       // following code does a hexdump of packet fragments to stdout ...
 713       do
 714         {
 715           u32 bi = reass->first_bi;
 716           u8 *s = NULL;
 717           while (~0 != bi)
 718             {
 719               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 720               s = format (s, "%u: %U\n", bi, format_hexdump,
 721                           vlib_buffer_get_current (b), b->current_length);
 722               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 723                 {
 724                   bi = b->next_buffer;
 725                 }
 726               else
 727                 {
 728                   break;
 729                 }
 730             }
 731           printf ("%.*s\n", vec_len (s), s);
 732           fflush (stdout);
 733           vec_free (s);
 734         }
 735       while (0);
 736 #endif
 737     }
 738   if (!is_custom_app)
 739     {
 740       *next0 = IP6_REASSEMBLY_NEXT_INPUT;
 741     }
 742   else
 743     {
 744       *next0 = reass->next_index;
 745     }
 746   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 747   ip6_reass_free (rm, rt, reass);
 748   reass = NULL;
 749 free_buffers_and_return:
 750   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 751   vec_free (vec_drop_compress);
 752   return rv;
 753 }
 754
 755 always_inline void
 756 ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
 757                                  ip6_reass_per_thread_t * rt,
 758                                  ip6_reass_t * reass, u32 prev_range_bi,
 759                                  u32 new_next_bi)
 760 {
 761
 762   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 763   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 764   if (~0 != prev_range_bi)
 765     {
 766       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 767       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 768       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 769       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 770     }
 771   else
 772     {
 773       if (~0 != reass->first_bi)
 774         {
 775           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 776         }
 777       reass->first_bi = new_next_bi;
 778     }
 779   reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
 780 }
 781
 782 always_inline ip6_reass_rc_t
 783 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 784                   ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 785                   ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
 786                   ip6_frag_hdr_t * frag_hdr, bool is_custom_app,
 787                   u32 * handoff_thread_idx)
 788 {
 789   int consumed = 0;
 790   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 791   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 792   if (is_custom_app)
 793     {
 794       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 795       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 796     }
 797
 798   fvnb->ip.reass.ip6_frag_hdr_offset =
 799     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 800   ip6_header_t *fip = vlib_buffer_get_current (fb);
 801   if (fb->current_length < sizeof (*fip) ||
 802       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 803       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 804     {
 805       return IP6_REASS_RC_INTERNAL_ERROR;
 806     }
 807
 808   u32 fragment_first = fvnb->ip.reass.fragment_first =
 809     ip6_frag_hdr_offset_bytes (frag_hdr);
 810   u32 fragment_length =
 811     vlib_buffer_length_in_chain (vm, fb) -
 812     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 813   u32 fragment_last = fvnb->ip.reass.fragment_last =
 814     fragment_first + fragment_length - 1;
 815   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 816   u32 candidate_range_bi = reass->first_bi;
 817   u32 prev_range_bi = ~0;
 818   fvnb->ip.reass.range_first = fragment_first;
 819   fvnb->ip.reass.range_last = fragment_last;
 820   fvnb->ip.reass.next_range_bi = ~0;
 821   if (!more_fragments)
 822     {
 823       reass->last_packet_octet = fragment_last;
 824     }
 825   if (~0 == reass->first_bi)
 826     {
 827       // starting a new reassembly
 828       ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 829                                        *bi0);
 830       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 831       consumed = 1;
 832       reass->fragments_n = 1;
 833       goto check_if_done_maybe;
 834     }
 835   reass->min_fragment_length =
 836     clib_min (clib_net_to_host_u16 (fip->payload_length),
 837               fvnb->ip.reass.estimated_mtu);
 838   while (~0 != candidate_range_bi)
 839     {
 840       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 841       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 842       if (fragment_first > candidate_vnb->ip.reass.range_last)
 843         {
 844           // this fragments starts after candidate range
 845           prev_range_bi = candidate_range_bi;
 846           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 847           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 848               ~0 == candidate_range_bi)
 849             {
 850               // special case - this fragment falls beyond all known ranges
 851               ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
 852                                                prev_range_bi, *bi0);
 853               consumed = 1;
 854               break;
 855             }
 856           continue;
 857         }
 858       if (fragment_last < candidate_vnb->ip.reass.range_first)
 859         {
 860           // this fragment ends before candidate range without any overlap
 861           ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 862                                            *bi0);
 863           consumed = 1;
 864         }
 865       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 866                fragment_last == candidate_vnb->ip.reass.range_last)
 867         {
 868           // duplicate fragment - ignore
 869         }
 870       else
 871         {
 872           // overlapping fragment - not allowed by RFC 8200
 873           ip6_reass_drop_all (vm, node, rm, reass);
 874           ip6_reass_free (rm, rt, reass);
 875           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 876             {
 877               ip6_reass_add_trace (vm, node, rm, reass->id,
 878                                    reass->trace_op_counter, *bi0,
 879                                    reass->first_bi, reass->data_len,
 880                                    RANGE_OVERLAP, ~0);
 881               ++reass->trace_op_counter;
 882             }
 883           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 884           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 885           return IP6_REASS_RC_OK;
 886         }
 887       break;
 888     }
 889   ++reass->fragments_n;
 890 check_if_done_maybe:
 891   if (consumed)
 892     {
 893       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 894         {
 895           ip6_reass_add_trace (vm, node, rm, reass->id,
 896                                reass->trace_op_counter, *bi0, reass->first_bi,
 897                                reass->data_len, RANGE_NEW, ~0);
 898           ++reass->trace_op_counter;
 899         }
 900     }
 901   if (~0 != reass->last_packet_octet &&
 902       reass->data_len == reass->last_packet_octet + 1)
 903     {
 904       *handoff_thread_idx = reass->sendout_thread_index;
 905       ip6_reass_rc_t rc =
 906         ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 907                             is_custom_app);
 908       if (IP6_REASS_RC_OK == rc
 909           && reass->memory_owner_thread_index != reass->sendout_thread_index)
 910         {
 911           return IP6_REASS_RC_HANDOFF;
 912         }
 913       return rc;
 914     }
 915   else
 916     {
 917       if (consumed)
 918         {
 919           *bi0 = ~0;
 920           if (reass->fragments_n > rm->max_reass_len)
 921             {
 922               return IP6_REASS_RC_TOO_MANY_FRAGMENTS;
 923             }
 924         }
 925       else
 926         {
 927           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 928           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 929         }
 930     }
 931   return IP6_REASS_RC_OK;
 932 }
 933
 934 always_inline bool
 935 ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 936                                       vlib_buffer_t * b,
 937                                       ip6_frag_hdr_t * frag_hdr)
 938 {
 939   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 940   while (ip6_ext_hdr (tmp->next_hdr))
 941     {
 942       tmp = ip6_ext_next_header (tmp);
 943     }
 944   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 945     {
 946       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 947                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 948                                    0);
 949       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 950
 951       return false;
 952     }
 953   return true;
 954 }
 955
 956 always_inline bool
 957 ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 958                                       vlib_node_runtime_t * node,
 959                                       vlib_buffer_t * b,
 960                                       ip6_frag_hdr_t * frag_hdr)
 961 {
 962   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 963   ip6_header_t *ip = vlib_buffer_get_current (b);
 964   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 965   u32 fragment_length =
 966     vlib_buffer_length_in_chain (vm, b) -
 967     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 968   if (more_fragments && 0 != fragment_length % 8)
 969     {
 970       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 971                                    ICMP6_parameter_problem_erroneous_header_field,
 972                                    (u8 *) & ip->payload_length - (u8 *) ip);
 973       return false;
 974     }
 975   return true;
 976 }
 977
 978 always_inline bool
 979 ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 980                                      vlib_node_runtime_t * node,
 981                                      vlib_buffer_t * b,
 982                                      ip6_frag_hdr_t * frag_hdr)
 983 {
 984   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 985   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 986   u32 fragment_length =
 987     vlib_buffer_length_in_chain (vm, b) -
 988     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 989   if (fragment_first + fragment_length > 65535)
 990     {
 991       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 992       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 993                                    ICMP6_parameter_problem_erroneous_header_field,
 994                                    (u8 *) & frag_hdr->fragment_offset_and_more
 995                                    - (u8 *) ip0);
 996       return false;
 997     }
 998   return true;
 999 }
1000
1001 always_inline uword
1002 ip6_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1003                        vlib_frame_t * frame, bool is_feature,
1004                        bool is_custom_app)
1005 {
1006   u32 *from = vlib_frame_vector_args (frame);
1007   u32 n_left_from, n_left_to_next, *to_next, next_index;
1008   ip6_reass_main_t *rm = &ip6_reass_main;
1009   ip6_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1010   clib_spinlock_lock (&rt->lock);
1011
1012   n_left_from = frame->n_vectors;
1013   next_index = node->cached_next_index;
1014   while (n_left_from > 0)
1015     {
1016       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1017
1018       while (n_left_from > 0 && n_left_to_next > 0)
1019         {
1020           u32 bi0;
1021           vlib_buffer_t *b0;
1022           u32 next0 = IP6_REASSEMBLY_NEXT_DROP;
1023           u32 error0 = IP6_ERROR_NONE;
1024           u32 icmp_bi = ~0;
1025
1026           bi0 = from[0];
1027           b0 = vlib_get_buffer (vm, bi0);
1028
1029           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1030           ip6_frag_hdr_t *frag_hdr = NULL;
1031           ip6_ext_header_t *prev_hdr;
1032           if (ip6_ext_hdr (ip0->protocol))
1033             {
1034               ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
1035                                      IP_PROTOCOL_IPV6_FRAGMENTATION);
1036             }
1037           if (!frag_hdr)
1038             {
1039               // this is a regular packet - no fragmentation
1040               next0 = IP6_REASSEMBLY_NEXT_INPUT;
1041               goto skip_reass;
1042             }
1043           if (0 == ip6_frag_hdr_offset (frag_hdr))
1044             {
1045               // first fragment - verify upper-layer is present
1046               if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
1047                 {
1048                   next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1049                   goto skip_reass;
1050                 }
1051             }
1052           if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
1053               || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
1054                                                        frag_hdr))
1055             {
1056               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1057               goto skip_reass;
1058             }
1059           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1060             (u8 *) frag_hdr - (u8 *) ip0;
1061
1062           ip6_reass_kv_t kv;
1063           u8 do_handoff = 0;
1064
1065           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1066           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1067           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1068           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1069           kv.k.as_u64[4] =
1070             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1071                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1072             (u64) frag_hdr->identification;
1073           kv.k.as_u64[5] = ip0->protocol;
1074
1075           ip6_reass_t *reass =
1076             ip6_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1077                                       &do_handoff);
1078
1079           if (reass)
1080             {
1081               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1082               if (0 == fragment_first)
1083                 {
1084                   reass->sendout_thread_index = vm->thread_index;
1085                 }
1086             }
1087           if (PREDICT_FALSE (do_handoff))
1088             {
1089               next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
1090               if (is_feature)
1091                 vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1092                   kv.v.memory_owner_thread_index;
1093               else
1094                 vnet_buffer (b0)->ip.reass.owner_thread_index =
1095                   kv.v.memory_owner_thread_index;
1096             }
1097           else if (reass)
1098             {
1099               u32 handoff_thread_idx;
1100               switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
1101                                         &error0, frag_hdr, is_custom_app,
1102                                         &handoff_thread_idx))
1103                 {
1104                 case IP6_REASS_RC_OK:
1105                   /* nothing to do here */
1106                   break;
1107                 case IP6_REASS_RC_HANDOFF:
1108                   next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
1109                   b0 = vlib_get_buffer (vm, bi0);
1110                   if (is_feature)
1111                     vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1112                       handoff_thread_idx;
1113                   else
1114                     vnet_buffer (b0)->ip.reass.owner_thread_index =
1115                       handoff_thread_idx;
1116                   break;
1117                 case IP6_REASS_RC_TOO_MANY_FRAGMENTS:
1118                   vlib_node_increment_counter (vm, node->node_index,
1119                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1120                                                1);
1121                   ip6_reass_drop_all (vm, node, rm, reass);
1122                   ip6_reass_free (rm, rt, reass);
1123                   goto next_packet;
1124                   break;
1125                 case IP6_REASS_RC_NO_BUF:
1126                   vlib_node_increment_counter (vm, node->node_index,
1127                                                IP6_ERROR_REASS_NO_BUF, 1);
1128                   ip6_reass_drop_all (vm, node, rm, reass);
1129                   ip6_reass_free (rm, rt, reass);
1130                   goto next_packet;
1131                   break;
1132                 case IP6_REASS_RC_INTERNAL_ERROR:
1133                   /* drop everything and start with a clean slate */
1134                   vlib_node_increment_counter (vm, node->node_index,
1135                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1136                                                1);
1137                   ip6_reass_drop_all (vm, node, rm, reass);
1138                   ip6_reass_free (rm, rt, reass);
1139                   goto next_packet;
1140                   break;
1141                 }
1142             }
1143           else
1144             {
1145               if (is_feature)
1146                 {
1147                   next0 = IP6_REASSEMBLY_NEXT_DROP;
1148                 }
1149               else
1150                 {
1151                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1152                   next0 = fvnb->ip.reass.error_next_index;
1153                 }
1154               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1155             }
1156
1157           b0->error = node->errors[error0];
1158
1159           if (~0 != bi0)
1160             {
1161             skip_reass:
1162               to_next[0] = bi0;
1163               to_next += 1;
1164               n_left_to_next -= 1;
1165               if (next0 == IP6_REASSEMBLY_NEXT_HANDOFF)
1166                 {
1167                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1168                     {
1169                       if (is_feature)
1170                         ip6_reass_add_trace (vm, node, rm, ~0,
1171                                              ~0,
1172                                              bi0, ~0, ~0, HANDOFF,
1173                                              vnet_buffer (b0)->ip.
1174                                              reass.owner_feature_thread_index);
1175                       else
1176                         ip6_reass_add_trace (vm, node, rm, ~0, ~0, bi0,
1177                                              ~0, ~0, HANDOFF,
1178                                              vnet_buffer (b0)->ip.
1179                                              reass.owner_thread_index);
1180                     }
1181                 }
1182               else if (is_feature && IP6_ERROR_NONE == error0)
1183                 {
1184                   b0 = vlib_get_buffer (vm, bi0);
1185                   vnet_feature_next (&next0, b0);
1186                 }
1187               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1188                                                n_left_to_next, bi0, next0);
1189             }
1190
1191           if (~0 != icmp_bi)
1192             {
1193               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1194               to_next[0] = icmp_bi;
1195               to_next += 1;
1196               n_left_to_next -= 1;
1197               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1198                                                n_left_to_next, icmp_bi,
1199                                                next0);
1200             }
1201         next_packet:
1202           from += 1;
1203           n_left_from -= 1;
1204         }
1205
1206       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1207     }
1208
1209   clib_spinlock_unlock (&rt->lock);
1210   return frame->n_vectors;
1211 }
1212
1213 static char *ip6_reassembly_error_strings[] = {
1214 #define _(sym, string) string,
1215   foreach_ip6_error
1216 #undef _
1217 };
1218
1219 VLIB_NODE_FN (ip6_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1220                                vlib_frame_t * frame)
1221 {
1222   return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1223                                 false /* is_custom_app */ );
1224 }
1225
1226 /* *INDENT-OFF* */
1227 VLIB_REGISTER_NODE (ip6_reass_node) = {
1228     .name = "ip6-reassembly",
1229     .vector_size = sizeof (u32),
1230     .format_trace = format_ip6_reass_trace,
1231     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1232     .error_strings = ip6_reassembly_error_strings,
1233     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1234     .next_nodes =
1235         {
1236                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1237                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1238                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1239                 [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reassembly-handoff",
1240         },
1241 };
1242 /* *INDENT-ON* */
1243
1244 VLIB_NODE_FN (ip6_reass_node_feature) (vlib_main_t * vm,
1245                                        vlib_node_runtime_t * node,
1246                                        vlib_frame_t * frame)
1247 {
1248   return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1249                                 false /* is_custom_app */ );
1250 }
1251
1252 /* *INDENT-OFF* */
1253 VLIB_REGISTER_NODE (ip6_reass_node_feature) = {
1254     .name = "ip6-reassembly-feature",
1255     .vector_size = sizeof (u32),
1256     .format_trace = format_ip6_reass_trace,
1257     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1258     .error_strings = ip6_reassembly_error_strings,
1259     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1260     .next_nodes =
1261         {
1262                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1263                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1264                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1265                 [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reass-feature-hoff",
1266         },
1267 };
1268 /* *INDENT-ON* */
1269
1270 /* *INDENT-OFF* */
1271 VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
1272     .arc_name = "ip6-unicast",
1273     .node_name = "ip6-reassembly-feature",
1274     .runs_before = VNET_FEATURES ("ip6-lookup",
1275                                   "ipsec6-input-feature"),
1276     .runs_after = 0,
1277 };
1278 /* *INDENT-ON* */
1279
1280 #ifndef CLIB_MARCH_VARIANT
1281 static u32
1282 ip6_reass_get_nbuckets ()
1283 {
1284   ip6_reass_main_t *rm = &ip6_reass_main;
1285   u32 nbuckets;
1286   u8 i;
1287
1288   nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
1289
1290   for (i = 0; i < 31; i++)
1291     if ((1 << i) >= nbuckets)
1292       break;
1293   nbuckets = 1 << i;
1294
1295   return nbuckets;
1296 }
1297 #endif /* CLIB_MARCH_VARIANT */
1298
1299 typedef enum
1300 {
1301   IP6_EVENT_CONFIG_CHANGED = 1,
1302 } ip6_reass_event_t;
1303
1304 #ifndef CLIB_MARCH_VARIANT
1305 typedef struct
1306 {
1307   int failure;
1308   clib_bihash_48_8_t *new_hash;
1309 } ip6_rehash_cb_ctx;
1310
1311 static void
1312 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1313 {
1314   ip6_rehash_cb_ctx *ctx = _ctx;
1315   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1316     {
1317       ctx->failure = 1;
1318     }
1319 }
1320
1321 static void
1322 ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1323                       u32 max_reassembly_length, u32 expire_walk_interval_ms)
1324 {
1325   ip6_reass_main.timeout_ms = timeout_ms;
1326   ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1327   ip6_reass_main.max_reass_n = max_reassemblies;
1328   ip6_reass_main.max_reass_len = max_reassembly_length;
1329   ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1330 }
1331
1332 vnet_api_error_t
1333 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1334                u32 max_reassembly_length, u32 expire_walk_interval_ms)
1335 {
1336   u32 old_nbuckets = ip6_reass_get_nbuckets ();
1337   ip6_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
1338                         expire_walk_interval_ms);
1339   vlib_process_signal_event (ip6_reass_main.vlib_main,
1340                              ip6_reass_main.ip6_reass_expire_node_idx,
1341                              IP6_EVENT_CONFIG_CHANGED, 0);
1342   u32 new_nbuckets = ip6_reass_get_nbuckets ();
1343   if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1344     {
1345       clib_bihash_48_8_t new_hash;
1346       clib_memset (&new_hash, 0, sizeof (new_hash));
1347       ip6_rehash_cb_ctx ctx;
1348       ctx.failure = 0;
1349       ctx.new_hash = &new_hash;
1350       clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1351                              new_nbuckets * 1024);
1352       clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1353                                                ip6_rehash_cb, &ctx);
1354       if (ctx.failure)
1355         {
1356           clib_bihash_free_48_8 (&new_hash);
1357           return -1;
1358         }
1359       else
1360         {
1361           clib_bihash_free_48_8 (&ip6_reass_main.hash);
1362           clib_memcpy_fast (&ip6_reass_main.hash, &new_hash,
1363                             sizeof (ip6_reass_main.hash));
1364           clib_bihash_copied (&ip6_reass_main.hash, &new_hash);
1365         }
1366     }
1367   return 0;
1368 }
1369
1370 vnet_api_error_t
1371 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1372                u32 * expire_walk_interval_ms)
1373 {
1374   *timeout_ms = ip6_reass_main.timeout_ms;
1375   *max_reassemblies = ip6_reass_main.max_reass_n;
1376   *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1377   return 0;
1378 }
1379
1380 static clib_error_t *
1381 ip6_reass_init_function (vlib_main_t * vm)
1382 {
1383   ip6_reass_main_t *rm = &ip6_reass_main;
1384   clib_error_t *error = 0;
1385   u32 nbuckets;
1386   vlib_node_t *node;
1387
1388   rm->vlib_main = vm;
1389
1390   vec_validate (rm->per_thread_data, vlib_num_workers ());
1391   ip6_reass_per_thread_t *rt;
1392   vec_foreach (rt, rm->per_thread_data)
1393   {
1394     clib_spinlock_init (&rt->lock);
1395     pool_alloc (rt->pool, rm->max_reass_n);
1396   }
1397
1398   node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1399   ASSERT (node);
1400   rm->ip6_reass_expire_node_idx = node->index;
1401
1402   ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
1403                         IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
1404                         IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1405                         IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1406
1407   nbuckets = ip6_reass_get_nbuckets ();
1408   clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1409
1410   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1411   ASSERT (node);
1412   rm->ip6_drop_idx = node->index;
1413   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1414   ASSERT (node);
1415   rm->ip6_icmp_error_idx = node->index;
1416
1417   if ((error = vlib_call_init_function (vm, ip_main_init)))
1418     return error;
1419   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1420                          ip6_reass_node.index);
1421
1422   rm->fq_index = vlib_frame_queue_main_init (ip6_reass_node.index, 0);
1423   rm->fq_feature_index =
1424     vlib_frame_queue_main_init (ip6_reass_node_feature.index, 0);
1425
1426   return error;
1427 }
1428
1429 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1430 #endif /* CLIB_MARCH_VARIANT */
1431
1432 static uword
1433 ip6_reass_walk_expired (vlib_main_t * vm,
1434                         vlib_node_runtime_t * node, vlib_frame_t * f)
1435 {
1436   ip6_reass_main_t *rm = &ip6_reass_main;
1437   uword event_type, *event_data = 0;
1438
1439   while (true)
1440     {
1441       vlib_process_wait_for_event_or_clock (vm,
1442                                             (f64) rm->expire_walk_interval_ms
1443                                             / (f64) MSEC_PER_SEC);
1444       event_type = vlib_process_get_events (vm, &event_data);
1445
1446       switch (event_type)
1447         {
1448         case ~0:                /* no events => timeout */
1449           /* nothing to do here */
1450           break;
1451         case IP6_EVENT_CONFIG_CHANGED:
1452           break;
1453         default:
1454           clib_warning ("BUG: event type 0x%wx", event_type);
1455           break;
1456         }
1457       f64 now = vlib_time_now (vm);
1458
1459       ip6_reass_t *reass;
1460       int *pool_indexes_to_free = NULL;
1461
1462       uword thread_index = 0;
1463       int index;
1464       const uword nthreads = vlib_num_workers () + 1;
1465       u32 *vec_icmp_bi = NULL;
1466       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1467         {
1468           ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1469           clib_spinlock_lock (&rt->lock);
1470
1471           vec_reset_length (pool_indexes_to_free);
1472           /* *INDENT-OFF* */
1473           pool_foreach_index (index, rt->pool, ({
1474                                 reass = pool_elt_at_index (rt->pool, index);
1475                                 if (now > reass->last_heard + rm->timeout)
1476                                   {
1477                                     vec_add1 (pool_indexes_to_free, index);
1478                                   }
1479                               }));
1480           /* *INDENT-ON* */
1481           int *i;
1482           /* *INDENT-OFF* */
1483           vec_foreach (i, pool_indexes_to_free)
1484           {
1485             ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1486             u32 icmp_bi = ~0;
1487             ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1488             if (~0 != icmp_bi)
1489               vec_add1 (vec_icmp_bi, icmp_bi);
1490
1491             ip6_reass_free (rm, rt, reass);
1492           }
1493           /* *INDENT-ON* */
1494
1495           clib_spinlock_unlock (&rt->lock);
1496         }
1497
1498       while (vec_len (vec_icmp_bi) > 0)
1499         {
1500           vlib_frame_t *f =
1501             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1502           u32 *to_next = vlib_frame_vector_args (f);
1503           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1504           int trace_frame = 0;
1505           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1506             {
1507               u32 bi = vec_pop (vec_icmp_bi);
1508               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1509               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1510                 trace_frame = 1;
1511               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1512               to_next[0] = bi;
1513               ++f->n_vectors;
1514               to_next += 1;
1515               n_left_to_next -= 1;
1516             }
1517           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1518           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1519         }
1520
1521       vec_free (pool_indexes_to_free);
1522       vec_free (vec_icmp_bi);
1523       if (event_data)
1524         {
1525           _vec_len (event_data) = 0;
1526         }
1527     }
1528
1529   return 0;
1530 }
1531
1532 /* *INDENT-OFF* */
1533 VLIB_REGISTER_NODE (ip6_reass_expire_node) = {
1534     .function = ip6_reass_walk_expired,
1535     .format_trace = format_ip6_reass_trace,
1536     .type = VLIB_NODE_TYPE_PROCESS,
1537     .name = "ip6-reassembly-expire-walk",
1538
1539     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1540     .error_strings = ip6_reassembly_error_strings,
1541
1542 };
1543 /* *INDENT-ON* */
1544
1545 static u8 *
1546 format_ip6_reass_key (u8 * s, va_list * args)
1547 {
1548   ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1549   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1550               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1551               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1552   return s;
1553 }
1554
1555 static u8 *
1556 format_ip6_reass (u8 * s, va_list * args)
1557 {
1558   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1559   ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1560
1561   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1562               "last_packet_octet: %u, trace_op_counter: %u\n",
1563               reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1564               reass->data_len, reass->last_packet_octet,
1565               reass->trace_op_counter);
1566   u32 bi = reass->first_bi;
1567   u32 counter = 0;
1568   while (~0 != bi)
1569     {
1570       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1571       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1572       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1573                   "fragment[%u, %u]\n",
1574                   counter, vnb->ip.reass.range_first,
1575                   vnb->ip.reass.range_last, bi,
1576                   ip6_reass_buffer_get_data_offset (b),
1577                   ip6_reass_buffer_get_data_len (b),
1578                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1579       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1580         {
1581           bi = b->next_buffer;
1582         }
1583       else
1584         {
1585           bi = ~0;
1586         }
1587     }
1588   return s;
1589 }
1590
1591 static clib_error_t *
1592 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1593                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1594 {
1595   ip6_reass_main_t *rm = &ip6_reass_main;
1596
1597   vlib_cli_output (vm, "---------------------");
1598   vlib_cli_output (vm, "IP6 reassembly status");
1599   vlib_cli_output (vm, "---------------------");
1600   bool details = false;
1601   if (unformat (input, "details"))
1602     {
1603       details = true;
1604     }
1605
1606   u32 sum_reass_n = 0;
1607   u64 sum_buffers_n = 0;
1608   ip6_reass_t *reass;
1609   uword thread_index;
1610   const uword nthreads = vlib_num_workers () + 1;
1611   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1612     {
1613       ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1614       clib_spinlock_lock (&rt->lock);
1615       if (details)
1616         {
1617           /* *INDENT-OFF* */
1618           pool_foreach (reass, rt->pool, {
1619             vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1620           });
1621           /* *INDENT-ON* */
1622         }
1623       sum_reass_n += rt->reass_n;
1624       clib_spinlock_unlock (&rt->lock);
1625     }
1626   vlib_cli_output (vm, "---------------------");
1627   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1628                    (long unsigned) sum_reass_n);
1629   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1630                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1631   vlib_cli_output (vm, "Buffers in use: %lu\n",
1632                    (long unsigned) sum_buffers_n);
1633   return 0;
1634 }
1635
1636 /* *INDENT-OFF* */
1637 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1638     .path = "show ip6-reassembly",
1639     .short_help = "show ip6-reassembly [details]",
1640     .function = show_ip6_reass,
1641 };
1642 /* *INDENT-ON* */
1643
1644 #ifndef CLIB_MARCH_VARIANT
1645 vnet_api_error_t
1646 ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1647 {
1648   return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
1649                                       sw_if_index, enable_disable, 0, 0);
1650 }
1651 #endif /* CLIB_MARCH_VARIANT */
1652
1653 #define foreach_ip6_reassembly_handoff_error                       \
1654 _(CONGESTION_DROP, "congestion drop")
1655
1656
1657 typedef enum
1658 {
1659 #define _(sym,str) IP6_REASSEMBLY_HANDOFF_ERROR_##sym,
1660   foreach_ip6_reassembly_handoff_error
1661 #undef _
1662     IP6_REASSEMBLY_HANDOFF_N_ERROR,
1663 } ip6_reassembly_handoff_error_t;
1664
1665 static char *ip6_reassembly_handoff_error_strings[] = {
1666 #define _(sym,string) string,
1667   foreach_ip6_reassembly_handoff_error
1668 #undef _
1669 };
1670
1671 typedef struct
1672 {
1673   u32 next_worker_index;
1674 } ip6_reassembly_handoff_trace_t;
1675
1676 static u8 *
1677 format_ip6_reassembly_handoff_trace (u8 * s, va_list * args)
1678 {
1679   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1680   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1681   ip6_reassembly_handoff_trace_t *t =
1682     va_arg (*args, ip6_reassembly_handoff_trace_t *);
1683
1684   s =
1685     format (s, "ip6-reassembly-handoff: next-worker %d",
1686             t->next_worker_index);
1687
1688   return s;
1689 }
1690
1691 always_inline uword
1692 ip6_reassembly_handoff_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1693                                vlib_frame_t * frame, bool is_feature)
1694 {
1695   ip6_reass_main_t *rm = &ip6_reass_main;
1696
1697   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1698   u32 n_enq, n_left_from, *from;
1699   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1700   u32 fq_index;
1701
1702   from = vlib_frame_vector_args (frame);
1703   n_left_from = frame->n_vectors;
1704   vlib_get_buffers (vm, from, bufs, n_left_from);
1705
1706   b = bufs;
1707   ti = thread_indices;
1708
1709   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1710
1711   while (n_left_from > 0)
1712     {
1713       ti[0] =
1714         (is_feature) ? vnet_buffer (b[0])->ip.
1715         reass.owner_feature_thread_index : vnet_buffer (b[0])->ip.
1716         reass.owner_thread_index;
1717
1718       if (PREDICT_FALSE
1719           ((node->flags & VLIB_NODE_FLAG_TRACE)
1720            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1721         {
1722           ip6_reassembly_handoff_trace_t *t =
1723             vlib_add_trace (vm, node, b[0], sizeof (*t));
1724           t->next_worker_index = ti[0];
1725         }
1726
1727       n_left_from -= 1;
1728       ti += 1;
1729       b += 1;
1730     }
1731   n_enq =
1732     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1733                                    frame->n_vectors, 1);
1734
1735   if (n_enq < frame->n_vectors)
1736     vlib_node_increment_counter (vm, node->node_index,
1737                                  IP6_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1738                                  frame->n_vectors - n_enq);
1739   return frame->n_vectors;
1740 }
1741
1742 VLIB_NODE_FN (ip6_reassembly_handoff_node) (vlib_main_t * vm,
1743                                             vlib_node_runtime_t * node,
1744                                             vlib_frame_t * frame)
1745 {
1746   return ip6_reassembly_handoff_inline (vm, node, frame,
1747                                         false /* is_feature */ );
1748 }
1749
1750 /* *INDENT-OFF* */
1751 VLIB_REGISTER_NODE (ip6_reassembly_handoff_node) = {
1752   .name = "ip6-reassembly-handoff",
1753   .vector_size = sizeof (u32),
1754   .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
1755   .error_strings = ip6_reassembly_handoff_error_strings,
1756   .format_trace = format_ip6_reassembly_handoff_trace,
1757
1758   .n_next_nodes = 1,
1759
1760   .next_nodes = {
1761     [0] = "error-drop",
1762   },
1763 };
1764
1765
1766 VLIB_NODE_FN (ip6_reassembly_feature_handoff_node) (vlib_main_t * vm,
1767                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1768 {
1769   return ip6_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1770 }
1771
1772
1773 /* *INDENT-OFF* */
1774 VLIB_REGISTER_NODE (ip6_reassembly_feature_handoff_node) = {
1775   .name = "ip6-reass-feature-hoff",
1776   .vector_size = sizeof (u32),
1777   .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
1778   .error_strings = ip6_reassembly_handoff_error_strings,
1779   .format_trace = format_ip6_reassembly_handoff_trace,
1780
1781   .n_next_nodes = 1,
1782
1783   .next_nodes = {
1784     [0] = "error-drop",
1785   },
1786 };
1787 /* *INDENT-ON* */
1788
1789 /*
1790  * fd.io coding-style-patch-verification: ON
1791  *
1792  * Local Variables:
1793  * eval: (c-set-style "gnu")
1794  * End:
1795  */