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                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 392                                                    to_next, n_left_to_next,
 393                                                    bi, next_index);
 394                 }
 395             }
 396           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 397         }
 398     }
 399   else
 400     {
 401       vlib_buffer_free (vm, to_free, vec_len (to_free));
 402     }
 403   vec_free (to_free);
 404 }
 405
 406 always_inline void
 407 ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 408                       ip6_reass_main_t * rm, ip6_reass_t * reass,
 409                       u32 * icmp_bi)
 410 {
 411   if (~0 == reass->first_bi)
 412     {
 413       return;
 414     }
 415   if (~0 == reass->next_index)  // custom apps don't want icmp
 416     {
 417       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 418       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 419         {
 420           *icmp_bi = reass->first_bi;
 421           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 422             {
 423               ip6_reass_add_trace (vm, node, rm, reass->id,
 424                                    reass->trace_op_counter, reass->first_bi,
 425                                    reass->first_bi, reass->data_len,
 426                                    ICMP_ERROR_RT_EXCEEDED, ~0);
 427               ++reass->trace_op_counter;
 428             }
 429           // fragment with offset zero received - send icmp message back
 430           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 431             {
 432               // separate first buffer from chain and steer it towards icmp node
 433               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 434               reass->first_bi = b->next_buffer;
 435             }
 436           else
 437             {
 438               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 439             }
 440           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 441                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 442                                        0);
 443         }
 444     }
 445   ip6_reass_drop_all (vm, node, rm, reass);
 446 }
 447
 448 always_inline ip6_reass_t *
 449 ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 450                           ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 451                           ip6_reass_kv_t * kv, u32 * icmp_bi, u8 * do_handoff)
 452 {
 453   ip6_reass_t *reass;
 454   f64 now;
 455
 456 again:
 457
 458   reass = NULL;
 459   now = vlib_time_now (vm);
 460
 461   if (!clib_bihash_search_48_8
 462       (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
 463     {
 464       reass =
 465         pool_elt_at_index (rm->per_thread_data
 466                            [kv->v.memory_owner_thread_index].pool,
 467                            kv->v.reass_index);
 468       if (vm->thread_index != kv->v.memory_owner_thread_index)
 469         {
 470           *do_handoff = 1;
 471           return reass;
 472         }
 473
 474       if (now > reass->last_heard + rm->timeout)
 475         {
 476           ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi);
 477           ip6_reass_free (rm, rt, reass);
 478           reass = NULL;
 479         }
 480     }
 481
 482   if (reass)
 483     {
 484       reass->last_heard = now;
 485       return reass;
 486     }
 487
 488   if (rt->reass_n >= rm->max_reass_n)
 489     {
 490       reass = NULL;
 491       return reass;
 492     }
 493   else
 494     {
 495       pool_get (rt->pool, reass);
 496       clib_memset (reass, 0, sizeof (*reass));
 497       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 498       ++rt->id_counter;
 499       reass->first_bi = ~0;
 500       reass->last_packet_octet = ~0;
 501       reass->data_len = 0;
 502       reass->next_index = ~0;
 503       reass->error_next_index = ~0;
 504       ++rt->reass_n;
 505     }
 506
 507   reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
 508   reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
 509   reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
 510   reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
 511   reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
 512   reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
 513   kv->v.reass_index = (reass - rt->pool);
 514   kv->v.memory_owner_thread_index = vm->thread_index;
 515   reass->last_heard = now;
 516
 517   int rv =
 518     clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
 519   if (rv)
 520     {
 521       ip6_reass_free_ctx (rt, reass);
 522       reass = NULL;
 523       // if other worker created a context already work with the other copy
 524       if (-2 == rv)
 525         goto again;
 526     }
 527
 528   return reass;
 529 }
 530
 531 always_inline ip6_reass_rc_t
 532 ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 533                     ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 534                     ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
 535                     bool is_custom_app)
 536 {
 537   *bi0 = reass->first_bi;
 538   *error0 = IP6_ERROR_NONE;
 539   ip6_frag_hdr_t *frag_hdr;
 540   vlib_buffer_t *last_b = NULL;
 541   u32 sub_chain_bi = reass->first_bi;
 542   u32 total_length = 0;
 543   u32 buf_cnt = 0;
 544   u32 dropped_cnt = 0;
 545   u32 *vec_drop_compress = NULL;
 546   ip6_reass_rc_t rv = IP6_REASS_RC_OK;
 547   do
 548     {
 549       u32 tmp_bi = sub_chain_bi;
 550       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 551       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 552       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 553           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 554         {
 555           rv = IP6_REASS_RC_INTERNAL_ERROR;
 556           goto free_buffers_and_return;
 557         }
 558
 559       u32 data_len = ip6_reass_buffer_get_data_len (tmp);
 560       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 561         sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
 562       u32 trim_end =
 563         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 564       if (tmp_bi == reass->first_bi)
 565         {
 566           /* first buffer - keep ip6 header */
 567           if (0 != ip6_reass_buffer_get_data_offset (tmp))
 568             {
 569               rv = IP6_REASS_RC_INTERNAL_ERROR;
 570               goto free_buffers_and_return;
 571             }
 572           trim_front = 0;
 573           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 574             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 575              sizeof (*frag_hdr));
 576           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 577             {
 578               rv = IP6_REASS_RC_INTERNAL_ERROR;
 579               goto free_buffers_and_return;
 580             }
 581         }
 582       u32 keep_data =
 583         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 584       while (1)
 585         {
 586           ++buf_cnt;
 587           if (trim_front)
 588             {
 589               if (trim_front > tmp->current_length)
 590                 {
 591                   /* drop whole buffer */
 592                   vec_add1 (vec_drop_compress, tmp_bi);
 593                   trim_front -= tmp->current_length;
 594                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 595                     {
 596                       rv = IP6_REASS_RC_INTERNAL_ERROR;
 597                       goto free_buffers_and_return;
 598                     }
 599                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 600                   tmp_bi = tmp->next_buffer;
 601                   tmp = vlib_get_buffer (vm, tmp_bi);
 602                   continue;
 603                 }
 604               else
 605                 {
 606                   vlib_buffer_advance (tmp, trim_front);
 607                   trim_front = 0;
 608                 }
 609             }
 610           if (keep_data)
 611             {
 612               if (last_b)
 613                 {
 614                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 615                   last_b->next_buffer = tmp_bi;
 616                 }
 617               last_b = tmp;
 618               if (keep_data <= tmp->current_length)
 619                 {
 620                   tmp->current_length = keep_data;
 621                   keep_data = 0;
 622                 }
 623               else
 624                 {
 625                   keep_data -= tmp->current_length;
 626                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 627                     {
 628                       rv = IP6_REASS_RC_INTERNAL_ERROR;
 629                       goto free_buffers_and_return;
 630                     }
 631                 }
 632               total_length += tmp->current_length;
 633             }
 634           else
 635             {
 636               vec_add1 (vec_drop_compress, tmp_bi);
 637               if (reass->first_bi == tmp_bi)
 638                 {
 639                   rv = IP6_REASS_RC_INTERNAL_ERROR;
 640                   goto free_buffers_and_return;
 641                 }
 642               ++dropped_cnt;
 643             }
 644           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 645             {
 646               tmp_bi = tmp->next_buffer;
 647               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 648             }
 649           else
 650             {
 651               break;
 652             }
 653         }
 654       sub_chain_bi =
 655         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 656         reass.next_range_bi;
 657     }
 658   while (~0 != sub_chain_bi);
 659
 660   if (!last_b)
 661     {
 662       rv = IP6_REASS_RC_INTERNAL_ERROR;
 663       goto free_buffers_and_return;
 664     }
 665   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 666   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 667   if (total_length < first_b->current_length)
 668     {
 669       rv = IP6_REASS_RC_INTERNAL_ERROR;
 670       goto free_buffers_and_return;
 671     }
 672   total_length -= first_b->current_length;
 673   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 674   first_b->total_length_not_including_first_buffer = total_length;
 675   // drop fragment header
 676   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 677   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 678   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 679   ip6_ext_header_t *prev_hdr;
 680   ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
 681                          IP_PROTOCOL_IPV6_FRAGMENTATION);
 682   if (prev_hdr)
 683     {
 684       prev_hdr->next_hdr = frag_hdr->next_hdr;
 685     }
 686   else
 687     {
 688       ip->protocol = frag_hdr->next_hdr;
 689     }
 690   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 691     {
 692       rv = IP6_REASS_RC_INTERNAL_ERROR;
 693       goto free_buffers_and_return;
 694     }
 695   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 696            first_b->current_length - ip6_frag_hdr_offset -
 697            sizeof (ip6_frag_hdr_t));
 698   first_b->current_length -= sizeof (*frag_hdr);
 699   ip->payload_length =
 700     clib_host_to_net_u16 (total_length + first_b->current_length -
 701                           sizeof (*ip));
 702   if (!vlib_buffer_chain_linearize (vm, first_b))
 703     {
 704       rv = IP6_REASS_RC_NO_BUF;
 705       goto free_buffers_and_return;
 706     }
 707   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 708   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 709     {
 710       ip6_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter,
 711                            reass->first_bi, reass->first_bi, reass->data_len,
 712                            FINALIZE, ~0);
 713       ++reass->trace_op_counter;
 714 #if 0
 715       // following code does a hexdump of packet fragments to stdout ...
 716       do
 717         {
 718           u32 bi = reass->first_bi;
 719           u8 *s = NULL;
 720           while (~0 != bi)
 721             {
 722               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 723               s = format (s, "%u: %U\n", bi, format_hexdump,
 724                           vlib_buffer_get_current (b), b->current_length);
 725               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 726                 {
 727                   bi = b->next_buffer;
 728                 }
 729               else
 730                 {
 731                   break;
 732                 }
 733             }
 734           printf ("%.*s\n", vec_len (s), s);
 735           fflush (stdout);
 736           vec_free (s);
 737         }
 738       while (0);
 739 #endif
 740     }
 741   if (!is_custom_app)
 742     {
 743       *next0 = IP6_REASSEMBLY_NEXT_INPUT;
 744     }
 745   else
 746     {
 747       *next0 = reass->next_index;
 748     }
 749   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 750   ip6_reass_free (rm, rt, reass);
 751   reass = NULL;
 752 free_buffers_and_return:
 753   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 754   vec_free (vec_drop_compress);
 755   return rv;
 756 }
 757
 758 always_inline void
 759 ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
 760                                  ip6_reass_per_thread_t * rt,
 761                                  ip6_reass_t * reass, u32 prev_range_bi,
 762                                  u32 new_next_bi)
 763 {
 764
 765   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 766   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 767   if (~0 != prev_range_bi)
 768     {
 769       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 770       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 771       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 772       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 773     }
 774   else
 775     {
 776       if (~0 != reass->first_bi)
 777         {
 778           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 779         }
 780       reass->first_bi = new_next_bi;
 781     }
 782   reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
 783 }
 784
 785 always_inline ip6_reass_rc_t
 786 ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 787                   ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
 788                   ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
 789                   ip6_frag_hdr_t * frag_hdr, bool is_custom_app,
 790                   u32 * handoff_thread_idx)
 791 {
 792   int consumed = 0;
 793   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 794   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 795   if (is_custom_app)
 796     {
 797       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 798       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 799     }
 800
 801   fvnb->ip.reass.ip6_frag_hdr_offset =
 802     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 803   ip6_header_t *fip = vlib_buffer_get_current (fb);
 804   if (fb->current_length < sizeof (*fip) ||
 805       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 806       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 807     {
 808       return IP6_REASS_RC_INTERNAL_ERROR;
 809     }
 810
 811   u32 fragment_first = fvnb->ip.reass.fragment_first =
 812     ip6_frag_hdr_offset_bytes (frag_hdr);
 813   u32 fragment_length =
 814     vlib_buffer_length_in_chain (vm, fb) -
 815     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 816   u32 fragment_last = fvnb->ip.reass.fragment_last =
 817     fragment_first + fragment_length - 1;
 818   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 819   u32 candidate_range_bi = reass->first_bi;
 820   u32 prev_range_bi = ~0;
 821   fvnb->ip.reass.range_first = fragment_first;
 822   fvnb->ip.reass.range_last = fragment_last;
 823   fvnb->ip.reass.next_range_bi = ~0;
 824   if (!more_fragments)
 825     {
 826       reass->last_packet_octet = fragment_last;
 827     }
 828   if (~0 == reass->first_bi)
 829     {
 830       // starting a new reassembly
 831       ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 832                                        *bi0);
 833       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 834       consumed = 1;
 835       reass->fragments_n = 1;
 836       goto check_if_done_maybe;
 837     }
 838   reass->min_fragment_length =
 839     clib_min (clib_net_to_host_u16 (fip->payload_length),
 840               fvnb->ip.reass.estimated_mtu);
 841   while (~0 != candidate_range_bi)
 842     {
 843       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 844       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 845       if (fragment_first > candidate_vnb->ip.reass.range_last)
 846         {
 847           // this fragments starts after candidate range
 848           prev_range_bi = candidate_range_bi;
 849           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 850           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 851               ~0 == candidate_range_bi)
 852             {
 853               // special case - this fragment falls beyond all known ranges
 854               ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
 855                                                prev_range_bi, *bi0);
 856               consumed = 1;
 857               break;
 858             }
 859           continue;
 860         }
 861       if (fragment_last < candidate_vnb->ip.reass.range_first)
 862         {
 863           // this fragment ends before candidate range without any overlap
 864           ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
 865                                            *bi0);
 866           consumed = 1;
 867         }
 868       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 869                fragment_last == candidate_vnb->ip.reass.range_last)
 870         {
 871           // duplicate fragment - ignore
 872         }
 873       else
 874         {
 875           // overlapping fragment - not allowed by RFC 8200
 876           ip6_reass_drop_all (vm, node, rm, reass);
 877           ip6_reass_free (rm, rt, reass);
 878           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 879             {
 880               ip6_reass_add_trace (vm, node, rm, reass->id,
 881                                    reass->trace_op_counter, *bi0,
 882                                    reass->first_bi, reass->data_len,
 883                                    RANGE_OVERLAP, ~0);
 884               ++reass->trace_op_counter;
 885             }
 886           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 887           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 888           return IP6_REASS_RC_OK;
 889         }
 890       break;
 891     }
 892   ++reass->fragments_n;
 893 check_if_done_maybe:
 894   if (consumed)
 895     {
 896       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 897         {
 898           ip6_reass_add_trace (vm, node, rm, reass->id,
 899                                reass->trace_op_counter, *bi0, reass->first_bi,
 900                                reass->data_len, RANGE_NEW, ~0);
 901           ++reass->trace_op_counter;
 902         }
 903     }
 904   if (~0 != reass->last_packet_octet &&
 905       reass->data_len == reass->last_packet_octet + 1)
 906     {
 907       *handoff_thread_idx = reass->sendout_thread_index;
 908       ip6_reass_rc_t rc =
 909         ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 910                             is_custom_app);
 911       if (IP6_REASS_RC_OK == rc
 912           && reass->memory_owner_thread_index != reass->sendout_thread_index)
 913         {
 914           return IP6_REASS_RC_HANDOFF;
 915         }
 916       return rc;
 917     }
 918   else
 919     {
 920       if (consumed)
 921         {
 922           *bi0 = ~0;
 923           if (reass->fragments_n > rm->max_reass_len)
 924             {
 925               return IP6_REASS_RC_TOO_MANY_FRAGMENTS;
 926             }
 927         }
 928       else
 929         {
 930           *next0 = IP6_REASSEMBLY_NEXT_DROP;
 931           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 932         }
 933     }
 934   return IP6_REASS_RC_OK;
 935 }
 936
 937 always_inline bool
 938 ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 939                                       vlib_buffer_t * b,
 940                                       ip6_frag_hdr_t * frag_hdr)
 941 {
 942   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 943   while (ip6_ext_hdr (tmp->next_hdr))
 944     {
 945       tmp = ip6_ext_next_header (tmp);
 946     }
 947   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 948     {
 949       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 950                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 951                                    0);
 952       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
 953
 954       return false;
 955     }
 956   return true;
 957 }
 958
 959 always_inline bool
 960 ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
 961                                       vlib_node_runtime_t * node,
 962                                       vlib_buffer_t * b,
 963                                       ip6_frag_hdr_t * frag_hdr)
 964 {
 965   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 966   ip6_header_t *ip = vlib_buffer_get_current (b);
 967   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 968   u32 fragment_length =
 969     vlib_buffer_length_in_chain (vm, b) -
 970     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 971   if (more_fragments && 0 != fragment_length % 8)
 972     {
 973       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 974                                    ICMP6_parameter_problem_erroneous_header_field,
 975                                    (u8 *) & ip->payload_length - (u8 *) ip);
 976       return false;
 977     }
 978   return true;
 979 }
 980
 981 always_inline bool
 982 ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
 983                                      vlib_node_runtime_t * node,
 984                                      vlib_buffer_t * b,
 985                                      ip6_frag_hdr_t * frag_hdr)
 986 {
 987   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 988   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
 989   u32 fragment_length =
 990     vlib_buffer_length_in_chain (vm, b) -
 991     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 992   if (fragment_first + fragment_length > 65535)
 993     {
 994       ip6_header_t *ip0 = vlib_buffer_get_current (b);
 995       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 996                                    ICMP6_parameter_problem_erroneous_header_field,
 997                                    (u8 *) & frag_hdr->fragment_offset_and_more
 998                                    - (u8 *) ip0);
 999       return false;
1000     }
1001   return true;
1002 }
1003
1004 always_inline uword
1005 ip6_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1006                        vlib_frame_t * frame, bool is_feature,
1007                        bool is_custom_app)
1008 {
1009   u32 *from = vlib_frame_vector_args (frame);
1010   u32 n_left_from, n_left_to_next, *to_next, next_index;
1011   ip6_reass_main_t *rm = &ip6_reass_main;
1012   ip6_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1013   clib_spinlock_lock (&rt->lock);
1014
1015   n_left_from = frame->n_vectors;
1016   next_index = node->cached_next_index;
1017   while (n_left_from > 0)
1018     {
1019       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1020
1021       while (n_left_from > 0 && n_left_to_next > 0)
1022         {
1023           u32 bi0;
1024           vlib_buffer_t *b0;
1025           u32 next0 = IP6_REASSEMBLY_NEXT_DROP;
1026           u32 error0 = IP6_ERROR_NONE;
1027           u32 icmp_bi = ~0;
1028
1029           bi0 = from[0];
1030           b0 = vlib_get_buffer (vm, bi0);
1031
1032           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1033           ip6_frag_hdr_t *frag_hdr = NULL;
1034           ip6_ext_header_t *prev_hdr;
1035           if (ip6_ext_hdr (ip0->protocol))
1036             {
1037               ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
1038                                      IP_PROTOCOL_IPV6_FRAGMENTATION);
1039             }
1040           if (!frag_hdr)
1041             {
1042               // this is a regular packet - no fragmentation
1043               next0 = IP6_REASSEMBLY_NEXT_INPUT;
1044               goto skip_reass;
1045             }
1046           if (0 == ip6_frag_hdr_offset (frag_hdr))
1047             {
1048               // first fragment - verify upper-layer is present
1049               if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
1050                 {
1051                   next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1052                   goto skip_reass;
1053                 }
1054             }
1055           if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
1056               || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
1057                                                        frag_hdr))
1058             {
1059               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1060               goto skip_reass;
1061             }
1062           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1063             (u8 *) frag_hdr - (u8 *) ip0;
1064
1065           ip6_reass_kv_t kv;
1066           u8 do_handoff = 0;
1067
1068           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1069           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1070           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1071           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1072           kv.k.as_u64[4] =
1073             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1074                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1075             (u64) frag_hdr->identification;
1076           kv.k.as_u64[5] = ip0->protocol;
1077
1078           ip6_reass_t *reass =
1079             ip6_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1080                                       &do_handoff);
1081
1082           if (reass)
1083             {
1084               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1085               if (0 == fragment_first)
1086                 {
1087                   reass->sendout_thread_index = vm->thread_index;
1088                 }
1089             }
1090           if (PREDICT_FALSE (do_handoff))
1091             {
1092               next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
1093               if (is_feature)
1094                 vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1095                   kv.v.memory_owner_thread_index;
1096               else
1097                 vnet_buffer (b0)->ip.reass.owner_thread_index =
1098                   kv.v.memory_owner_thread_index;
1099             }
1100           else if (reass)
1101             {
1102               u32 handoff_thread_idx;
1103               switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
1104                                         &error0, frag_hdr, is_custom_app,
1105                                         &handoff_thread_idx))
1106                 {
1107                 case IP6_REASS_RC_OK:
1108                   /* nothing to do here */
1109                   break;
1110                 case IP6_REASS_RC_HANDOFF:
1111                   next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
1112                   b0 = vlib_get_buffer (vm, bi0);
1113                   if (is_feature)
1114                     vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
1115                       handoff_thread_idx;
1116                   else
1117                     vnet_buffer (b0)->ip.reass.owner_thread_index =
1118                       handoff_thread_idx;
1119                   break;
1120                 case IP6_REASS_RC_TOO_MANY_FRAGMENTS:
1121                   vlib_node_increment_counter (vm, node->node_index,
1122                                                IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1123                                                1);
1124                   ip6_reass_drop_all (vm, node, rm, reass);
1125                   ip6_reass_free (rm, rt, reass);
1126                   goto next_packet;
1127                   break;
1128                 case IP6_REASS_RC_NO_BUF:
1129                   vlib_node_increment_counter (vm, node->node_index,
1130                                                IP6_ERROR_REASS_NO_BUF, 1);
1131                   ip6_reass_drop_all (vm, node, rm, reass);
1132                   ip6_reass_free (rm, rt, reass);
1133                   goto next_packet;
1134                   break;
1135                 case IP6_REASS_RC_INTERNAL_ERROR:
1136                   /* drop everything and start with a clean slate */
1137                   vlib_node_increment_counter (vm, node->node_index,
1138                                                IP6_ERROR_REASS_INTERNAL_ERROR,
1139                                                1);
1140                   ip6_reass_drop_all (vm, node, rm, reass);
1141                   ip6_reass_free (rm, rt, reass);
1142                   goto next_packet;
1143                   break;
1144                 }
1145             }
1146           else
1147             {
1148               if (is_feature)
1149                 {
1150                   next0 = IP6_REASSEMBLY_NEXT_DROP;
1151                 }
1152               else
1153                 {
1154                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1155                   next0 = fvnb->ip.reass.error_next_index;
1156                 }
1157               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1158             }
1159
1160           b0->error = node->errors[error0];
1161
1162           if (~0 != bi0)
1163             {
1164             skip_reass:
1165               to_next[0] = bi0;
1166               to_next += 1;
1167               n_left_to_next -= 1;
1168               if (next0 == IP6_REASSEMBLY_NEXT_HANDOFF)
1169                 {
1170                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1171                     {
1172                       if (is_feature)
1173                         ip6_reass_add_trace (vm, node, rm, ~0,
1174                                              ~0,
1175                                              bi0, ~0, ~0, HANDOFF,
1176                                              vnet_buffer (b0)->ip.
1177                                              reass.owner_feature_thread_index);
1178                       else
1179                         ip6_reass_add_trace (vm, node, rm, ~0, ~0, bi0,
1180                                              ~0, ~0, HANDOFF,
1181                                              vnet_buffer (b0)->ip.
1182                                              reass.owner_thread_index);
1183                     }
1184                 }
1185               else if (is_feature && IP6_ERROR_NONE == error0)
1186                 {
1187                   b0 = vlib_get_buffer (vm, bi0);
1188                   vnet_feature_next (&next0, b0);
1189                 }
1190               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1191                                                n_left_to_next, bi0, next0);
1192             }
1193
1194           if (~0 != icmp_bi)
1195             {
1196               next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
1197               to_next[0] = icmp_bi;
1198               to_next += 1;
1199               n_left_to_next -= 1;
1200               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1201                                                n_left_to_next, icmp_bi,
1202                                                next0);
1203             }
1204         next_packet:
1205           from += 1;
1206           n_left_from -= 1;
1207         }
1208
1209       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1210     }
1211
1212   clib_spinlock_unlock (&rt->lock);
1213   return frame->n_vectors;
1214 }
1215
1216 static char *ip6_reassembly_error_strings[] = {
1217 #define _(sym, string) string,
1218   foreach_ip6_error
1219 #undef _
1220 };
1221
1222 VLIB_NODE_FN (ip6_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
1223                                vlib_frame_t * frame)
1224 {
1225   return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1226                                 false /* is_custom_app */ );
1227 }
1228
1229 /* *INDENT-OFF* */
1230 VLIB_REGISTER_NODE (ip6_reass_node) = {
1231     .name = "ip6-reassembly",
1232     .vector_size = sizeof (u32),
1233     .format_trace = format_ip6_reass_trace,
1234     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1235     .error_strings = ip6_reassembly_error_strings,
1236     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1237     .next_nodes =
1238         {
1239                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1240                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1241                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1242                 [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reassembly-handoff",
1243         },
1244 };
1245 /* *INDENT-ON* */
1246
1247 VLIB_NODE_FN (ip6_reass_node_feature) (vlib_main_t * vm,
1248                                        vlib_node_runtime_t * node,
1249                                        vlib_frame_t * frame)
1250 {
1251   return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1252                                 false /* is_custom_app */ );
1253 }
1254
1255 /* *INDENT-OFF* */
1256 VLIB_REGISTER_NODE (ip6_reass_node_feature) = {
1257     .name = "ip6-reassembly-feature",
1258     .vector_size = sizeof (u32),
1259     .format_trace = format_ip6_reass_trace,
1260     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1261     .error_strings = ip6_reassembly_error_strings,
1262     .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
1263     .next_nodes =
1264         {
1265                 [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1266                 [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1267                 [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1268                 [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reass-feature-hoff",
1269         },
1270 };
1271 /* *INDENT-ON* */
1272
1273 /* *INDENT-OFF* */
1274 VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
1275     .arc_name = "ip6-unicast",
1276     .node_name = "ip6-reassembly-feature",
1277     .runs_before = VNET_FEATURES ("ip6-lookup",
1278                                   "ipsec6-input-feature"),
1279     .runs_after = 0,
1280 };
1281 /* *INDENT-ON* */
1282
1283 #ifndef CLIB_MARCH_VARIANT
1284 static u32
1285 ip6_reass_get_nbuckets ()
1286 {
1287   ip6_reass_main_t *rm = &ip6_reass_main;
1288   u32 nbuckets;
1289   u8 i;
1290
1291   nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
1292
1293   for (i = 0; i < 31; i++)
1294     if ((1 << i) >= nbuckets)
1295       break;
1296   nbuckets = 1 << i;
1297
1298   return nbuckets;
1299 }
1300 #endif /* CLIB_MARCH_VARIANT */
1301
1302 typedef enum
1303 {
1304   IP6_EVENT_CONFIG_CHANGED = 1,
1305 } ip6_reass_event_t;
1306
1307 #ifndef CLIB_MARCH_VARIANT
1308 typedef struct
1309 {
1310   int failure;
1311   clib_bihash_48_8_t *new_hash;
1312 } ip6_rehash_cb_ctx;
1313
1314 static void
1315 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1316 {
1317   ip6_rehash_cb_ctx *ctx = _ctx;
1318   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1319     {
1320       ctx->failure = 1;
1321     }
1322 }
1323
1324 static void
1325 ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1326                       u32 max_reassembly_length, u32 expire_walk_interval_ms)
1327 {
1328   ip6_reass_main.timeout_ms = timeout_ms;
1329   ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1330   ip6_reass_main.max_reass_n = max_reassemblies;
1331   ip6_reass_main.max_reass_len = max_reassembly_length;
1332   ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1333 }
1334
1335 vnet_api_error_t
1336 ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
1337                u32 max_reassembly_length, u32 expire_walk_interval_ms)
1338 {
1339   u32 old_nbuckets = ip6_reass_get_nbuckets ();
1340   ip6_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
1341                         expire_walk_interval_ms);
1342   vlib_process_signal_event (ip6_reass_main.vlib_main,
1343                              ip6_reass_main.ip6_reass_expire_node_idx,
1344                              IP6_EVENT_CONFIG_CHANGED, 0);
1345   u32 new_nbuckets = ip6_reass_get_nbuckets ();
1346   if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1347     {
1348       clib_bihash_48_8_t new_hash;
1349       clib_memset (&new_hash, 0, sizeof (new_hash));
1350       ip6_rehash_cb_ctx ctx;
1351       ctx.failure = 0;
1352       ctx.new_hash = &new_hash;
1353       clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
1354                              new_nbuckets * 1024);
1355       clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
1356                                                ip6_rehash_cb, &ctx);
1357       if (ctx.failure)
1358         {
1359           clib_bihash_free_48_8 (&new_hash);
1360           return -1;
1361         }
1362       else
1363         {
1364           clib_bihash_free_48_8 (&ip6_reass_main.hash);
1365           clib_memcpy_fast (&ip6_reass_main.hash, &new_hash,
1366                             sizeof (ip6_reass_main.hash));
1367           clib_bihash_copied (&ip6_reass_main.hash, &new_hash);
1368         }
1369     }
1370   return 0;
1371 }
1372
1373 vnet_api_error_t
1374 ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1375                u32 * expire_walk_interval_ms)
1376 {
1377   *timeout_ms = ip6_reass_main.timeout_ms;
1378   *max_reassemblies = ip6_reass_main.max_reass_n;
1379   *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
1380   return 0;
1381 }
1382
1383 static clib_error_t *
1384 ip6_reass_init_function (vlib_main_t * vm)
1385 {
1386   ip6_reass_main_t *rm = &ip6_reass_main;
1387   clib_error_t *error = 0;
1388   u32 nbuckets;
1389   vlib_node_t *node;
1390
1391   rm->vlib_main = vm;
1392
1393   vec_validate (rm->per_thread_data, vlib_num_workers ());
1394   ip6_reass_per_thread_t *rt;
1395   vec_foreach (rt, rm->per_thread_data)
1396   {
1397     clib_spinlock_init (&rt->lock);
1398     pool_alloc (rt->pool, rm->max_reass_n);
1399   }
1400
1401   node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
1402   ASSERT (node);
1403   rm->ip6_reass_expire_node_idx = node->index;
1404
1405   ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
1406                         IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
1407                         IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1408                         IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1409
1410   nbuckets = ip6_reass_get_nbuckets ();
1411   clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
1412
1413   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1414   ASSERT (node);
1415   rm->ip6_drop_idx = node->index;
1416   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1417   ASSERT (node);
1418   rm->ip6_icmp_error_idx = node->index;
1419
1420   if ((error = vlib_call_init_function (vm, ip_main_init)))
1421     return error;
1422   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1423                          ip6_reass_node.index);
1424
1425   rm->fq_index = vlib_frame_queue_main_init (ip6_reass_node.index, 0);
1426   rm->fq_feature_index =
1427     vlib_frame_queue_main_init (ip6_reass_node_feature.index, 0);
1428
1429   return error;
1430 }
1431
1432 VLIB_INIT_FUNCTION (ip6_reass_init_function);
1433 #endif /* CLIB_MARCH_VARIANT */
1434
1435 static uword
1436 ip6_reass_walk_expired (vlib_main_t * vm,
1437                         vlib_node_runtime_t * node, vlib_frame_t * f)
1438 {
1439   ip6_reass_main_t *rm = &ip6_reass_main;
1440   uword event_type, *event_data = 0;
1441
1442   while (true)
1443     {
1444       vlib_process_wait_for_event_or_clock (vm,
1445                                             (f64) rm->expire_walk_interval_ms
1446                                             / (f64) MSEC_PER_SEC);
1447       event_type = vlib_process_get_events (vm, &event_data);
1448
1449       switch (event_type)
1450         {
1451         case ~0:                /* no events => timeout */
1452           /* nothing to do here */
1453           break;
1454         case IP6_EVENT_CONFIG_CHANGED:
1455           break;
1456         default:
1457           clib_warning ("BUG: event type 0x%wx", event_type);
1458           break;
1459         }
1460       f64 now = vlib_time_now (vm);
1461
1462       ip6_reass_t *reass;
1463       int *pool_indexes_to_free = NULL;
1464
1465       uword thread_index = 0;
1466       int index;
1467       const uword nthreads = vlib_num_workers () + 1;
1468       u32 *vec_icmp_bi = NULL;
1469       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1470         {
1471           ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1472           clib_spinlock_lock (&rt->lock);
1473
1474           vec_reset_length (pool_indexes_to_free);
1475           /* *INDENT-OFF* */
1476           pool_foreach_index (index, rt->pool, ({
1477                                 reass = pool_elt_at_index (rt->pool, index);
1478                                 if (now > reass->last_heard + rm->timeout)
1479                                   {
1480                                     vec_add1 (pool_indexes_to_free, index);
1481                                   }
1482                               }));
1483           /* *INDENT-ON* */
1484           int *i;
1485           /* *INDENT-OFF* */
1486           vec_foreach (i, pool_indexes_to_free)
1487           {
1488             ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1489             u32 icmp_bi = ~0;
1490             ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
1491             if (~0 != icmp_bi)
1492               vec_add1 (vec_icmp_bi, icmp_bi);
1493
1494             ip6_reass_free (rm, rt, reass);
1495           }
1496           /* *INDENT-ON* */
1497
1498           clib_spinlock_unlock (&rt->lock);
1499         }
1500
1501       while (vec_len (vec_icmp_bi) > 0)
1502         {
1503           vlib_frame_t *f =
1504             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1505           u32 *to_next = vlib_frame_vector_args (f);
1506           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1507           int trace_frame = 0;
1508           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1509             {
1510               u32 bi = vec_pop (vec_icmp_bi);
1511               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1512               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1513                 trace_frame = 1;
1514               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1515               to_next[0] = bi;
1516               ++f->n_vectors;
1517               to_next += 1;
1518               n_left_to_next -= 1;
1519             }
1520           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1521           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1522         }
1523
1524       vec_free (pool_indexes_to_free);
1525       vec_free (vec_icmp_bi);
1526       if (event_data)
1527         {
1528           _vec_len (event_data) = 0;
1529         }
1530     }
1531
1532   return 0;
1533 }
1534
1535 /* *INDENT-OFF* */
1536 VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
1537     .function = ip6_reass_walk_expired,
1538     .format_trace = format_ip6_reass_trace,
1539     .type = VLIB_NODE_TYPE_PROCESS,
1540     .name = "ip6-reassembly-expire-walk",
1541
1542     .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
1543     .error_strings = ip6_reassembly_error_strings,
1544
1545 };
1546 /* *INDENT-ON* */
1547
1548 static u8 *
1549 format_ip6_reass_key (u8 * s, va_list * args)
1550 {
1551   ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
1552   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1553               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1554               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1555   return s;
1556 }
1557
1558 static u8 *
1559 format_ip6_reass (u8 * s, va_list * args)
1560 {
1561   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1562   ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
1563
1564   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1565               "last_packet_octet: %u, trace_op_counter: %u\n",
1566               reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
1567               reass->data_len, reass->last_packet_octet,
1568               reass->trace_op_counter);
1569   u32 bi = reass->first_bi;
1570   u32 counter = 0;
1571   while (~0 != bi)
1572     {
1573       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1574       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1575       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1576                   "fragment[%u, %u]\n",
1577                   counter, vnb->ip.reass.range_first,
1578                   vnb->ip.reass.range_last, bi,
1579                   ip6_reass_buffer_get_data_offset (b),
1580                   ip6_reass_buffer_get_data_len (b),
1581                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1582       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1583         {
1584           bi = b->next_buffer;
1585         }
1586       else
1587         {
1588           bi = ~0;
1589         }
1590     }
1591   return s;
1592 }
1593
1594 static clib_error_t *
1595 show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
1596                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1597 {
1598   ip6_reass_main_t *rm = &ip6_reass_main;
1599
1600   vlib_cli_output (vm, "---------------------");
1601   vlib_cli_output (vm, "IP6 reassembly status");
1602   vlib_cli_output (vm, "---------------------");
1603   bool details = false;
1604   if (unformat (input, "details"))
1605     {
1606       details = true;
1607     }
1608
1609   u32 sum_reass_n = 0;
1610   u64 sum_buffers_n = 0;
1611   ip6_reass_t *reass;
1612   uword thread_index;
1613   const uword nthreads = vlib_num_workers () + 1;
1614   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1615     {
1616       ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1617       clib_spinlock_lock (&rt->lock);
1618       if (details)
1619         {
1620           /* *INDENT-OFF* */
1621           pool_foreach (reass, rt->pool, {
1622             vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
1623           });
1624           /* *INDENT-ON* */
1625         }
1626       sum_reass_n += rt->reass_n;
1627       clib_spinlock_unlock (&rt->lock);
1628     }
1629   vlib_cli_output (vm, "---------------------");
1630   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1631                    (long unsigned) sum_reass_n);
1632   vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
1633                    "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
1634   vlib_cli_output (vm, "Buffers in use: %lu\n",
1635                    (long unsigned) sum_buffers_n);
1636   return 0;
1637 }
1638
1639 /* *INDENT-OFF* */
1640 VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
1641     .path = "show ip6-reassembly",
1642     .short_help = "show ip6-reassembly [details]",
1643     .function = show_ip6_reass,
1644 };
1645 /* *INDENT-ON* */
1646
1647 #ifndef CLIB_MARCH_VARIANT
1648 vnet_api_error_t
1649 ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1650 {
1651   return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
1652                                       sw_if_index, enable_disable, 0, 0);
1653 }
1654 #endif /* CLIB_MARCH_VARIANT */
1655
1656 #define foreach_ip6_reassembly_handoff_error                       \
1657 _(CONGESTION_DROP, "congestion drop")
1658
1659
1660 typedef enum
1661 {
1662 #define _(sym,str) IP6_REASSEMBLY_HANDOFF_ERROR_##sym,
1663   foreach_ip6_reassembly_handoff_error
1664 #undef _
1665     IP6_REASSEMBLY_HANDOFF_N_ERROR,
1666 } ip6_reassembly_handoff_error_t;
1667
1668 static char *ip6_reassembly_handoff_error_strings[] = {
1669 #define _(sym,string) string,
1670   foreach_ip6_reassembly_handoff_error
1671 #undef _
1672 };
1673
1674 typedef struct
1675 {
1676   u32 next_worker_index;
1677 } ip6_reassembly_handoff_trace_t;
1678
1679 static u8 *
1680 format_ip6_reassembly_handoff_trace (u8 * s, va_list * args)
1681 {
1682   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1683   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1684   ip6_reassembly_handoff_trace_t *t =
1685     va_arg (*args, ip6_reassembly_handoff_trace_t *);
1686
1687   s =
1688     format (s, "ip6-reassembly-handoff: next-worker %d",
1689             t->next_worker_index);
1690
1691   return s;
1692 }
1693
1694 always_inline uword
1695 ip6_reassembly_handoff_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1696                                vlib_frame_t * frame, bool is_feature)
1697 {
1698   ip6_reass_main_t *rm = &ip6_reass_main;
1699
1700   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1701   u32 n_enq, n_left_from, *from;
1702   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1703   u32 fq_index;
1704
1705   from = vlib_frame_vector_args (frame);
1706   n_left_from = frame->n_vectors;
1707   vlib_get_buffers (vm, from, bufs, n_left_from);
1708
1709   b = bufs;
1710   ti = thread_indices;
1711
1712   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1713
1714   while (n_left_from > 0)
1715     {
1716       ti[0] =
1717         (is_feature) ? vnet_buffer (b[0])->ip.
1718         reass.owner_feature_thread_index : vnet_buffer (b[0])->ip.
1719         reass.owner_thread_index;
1720
1721       if (PREDICT_FALSE
1722           ((node->flags & VLIB_NODE_FLAG_TRACE)
1723            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1724         {
1725           ip6_reassembly_handoff_trace_t *t =
1726             vlib_add_trace (vm, node, b[0], sizeof (*t));
1727           t->next_worker_index = ti[0];
1728         }
1729
1730       n_left_from -= 1;
1731       ti += 1;
1732       b += 1;
1733     }
1734   n_enq =
1735     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1736                                    frame->n_vectors, 1);
1737
1738   if (n_enq < frame->n_vectors)
1739     vlib_node_increment_counter (vm, node->node_index,
1740                                  IP6_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1741                                  frame->n_vectors - n_enq);
1742   return frame->n_vectors;
1743 }
1744
1745 VLIB_NODE_FN (ip6_reassembly_handoff_node) (vlib_main_t * vm,
1746                                             vlib_node_runtime_t * node,
1747                                             vlib_frame_t * frame)
1748 {
1749   return ip6_reassembly_handoff_inline (vm, node, frame,
1750                                         false /* is_feature */ );
1751 }
1752
1753 /* *INDENT-OFF* */
1754 VLIB_REGISTER_NODE (ip6_reassembly_handoff_node) = {
1755   .name = "ip6-reassembly-handoff",
1756   .vector_size = sizeof (u32),
1757   .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
1758   .error_strings = ip6_reassembly_handoff_error_strings,
1759   .format_trace = format_ip6_reassembly_handoff_trace,
1760
1761   .n_next_nodes = 1,
1762
1763   .next_nodes = {
1764     [0] = "error-drop",
1765   },
1766 };
1767
1768
1769 VLIB_NODE_FN (ip6_reassembly_feature_handoff_node) (vlib_main_t * vm,
1770                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1771 {
1772   return ip6_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1773 }
1774
1775
1776 /* *INDENT-OFF* */
1777 VLIB_REGISTER_NODE (ip6_reassembly_feature_handoff_node) = {
1778   .name = "ip6-reass-feature-hoff",
1779   .vector_size = sizeof (u32),
1780   .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
1781   .error_strings = ip6_reassembly_handoff_error_strings,
1782   .format_trace = format_ip6_reassembly_handoff_trace,
1783
1784   .n_next_nodes = 1,
1785
1786   .next_nodes = {
1787     [0] = "error-drop",
1788   },
1789 };
1790 /* *INDENT-ON* */
1791
1792 /*
1793  * fd.io coding-style-patch-verification: ON
1794  *
1795  * Local Variables:
1796  * eval: (c-set-style "gnu")
1797  * End:
1798  */