src/vnet/ip/reass/ip6_full_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv6 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv6 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/bihash_48_8.h>
  27 #include <vnet/ip/reass/ip6_full_reass.h>
  28
  29 #define MSEC_PER_SEC 1000
  30 #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100
  31 #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000    // 10 seconds default
  32 #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  33 #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  34 #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
  35
  36 typedef enum
  37 {
  38   IP6_FULL_REASS_RC_OK,
  39   IP6_FULL_REASS_RC_INTERNAL_ERROR,
  40   IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
  41   IP6_FULL_REASS_RC_NO_BUF,
  42   IP6_FULL_REASS_RC_HANDOFF,
  43 } ip6_full_reass_rc_t;
  44
  45 typedef struct
  46 {
  47   union
  48   {
  49     struct
  50     {
  51       ip6_address_t src;
  52       ip6_address_t dst;
  53       u32 xx_id;
  54       u32 frag_id;
  55       u8 unused[7];
  56       u8 proto;
  57     };
  58     u64 as_u64[6];
  59   };
  60 } ip6_full_reass_key_t;
  61
  62 typedef union
  63 {
  64   struct
  65   {
  66     u32 reass_index;
  67     u32 memory_owner_thread_index;
  68   };
  69   u64 as_u64;
  70 } ip6_full_reass_val_t;
  71
  72 typedef union
  73 {
  74   struct
  75   {
  76     ip6_full_reass_key_t k;
  77     ip6_full_reass_val_t v;
  78   };
  79   clib_bihash_kv_48_8_t kv;
  80 } ip6_full_reass_kv_t;
  81
  82
  83 always_inline u32
  84 ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
  85 {
  86   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  87   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
  88 }
  89
  90 always_inline u16
  91 ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b)
  92 {
  93   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
  94   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
  95     (vnb->ip.reass.fragment_first +
  96      ip6_full_reass_buffer_get_data_offset (b)) + 1;
  97 }
  98
  99 typedef struct
 100 {
 101   // hash table key
 102   ip6_full_reass_key_t key;
 103   // time when last packet was received
 104   f64 last_heard;
 105   // internal id of this reassembly
 106   u64 id;
 107   // buffer index of first buffer in this reassembly context
 108   u32 first_bi;
 109   // last octet of packet, ~0 until fragment without more_fragments arrives
 110   u32 last_packet_octet;
 111   // length of data collected so far
 112   u32 data_len;
 113   // trace operation counter
 114   u32 trace_op_counter;
 115   // next index - used by custom apps (~0 if not set)
 116   u32 next_index;
 117   // error next index - used by custom apps (~0 if not set)
 118   u32 error_next_index;
 119   // minimum fragment length for this reassembly - used to estimate MTU
 120   u16 min_fragment_length;
 121   // number of fragments for this reassembly
 122   u32 fragments_n;
 123   // thread owning memory for this context (whose pool contains this ctx)
 124   u32 memory_owner_thread_index;
 125   // thread which received fragment with offset 0 and which sends out the
 126   // completed reassembly
 127   u32 sendout_thread_index;
 128 } ip6_full_reass_t;
 129
 130 typedef struct
 131 {
 132   ip6_full_reass_t *pool;
 133   u32 reass_n;
 134   u32 id_counter;
 135   clib_spinlock_t lock;
 136 } ip6_full_reass_per_thread_t;
 137
 138 typedef struct
 139 {
 140   // IPv6 config
 141   u32 timeout_ms;
 142   f64 timeout;
 143   u32 expire_walk_interval_ms;
 144   // maximum number of fragments in one reassembly
 145   u32 max_reass_len;
 146   // maximum number of reassemblies
 147   u32 max_reass_n;
 148
 149   // IPv6 runtime
 150   clib_bihash_48_8_t hash;
 151
 152   // per-thread data
 153   ip6_full_reass_per_thread_t *per_thread_data;
 154
 155   // convenience
 156   vlib_main_t *vlib_main;
 157
 158   // node index of ip6-drop node
 159   u32 ip6_drop_idx;
 160   u32 ip6_icmp_error_idx;
 161   u32 ip6_full_reass_expire_node_idx;
 162
 163   /** Worker handoff */
 164   u32 fq_index;
 165   u32 fq_feature_index;
 166
 167   // reference count for enabling/disabling feature - per interface
 168   u32 *feature_use_refcount_per_intf;
 169 } ip6_full_reass_main_t;
 170
 171 extern ip6_full_reass_main_t ip6_full_reass_main;
 172
 173 #ifndef CLIB_MARCH_VARIANT
 174 ip6_full_reass_main_t ip6_full_reass_main;
 175 #endif /* CLIB_MARCH_VARIANT */
 176
 177 typedef enum
 178 {
 179   IP6_FULL_REASSEMBLY_NEXT_INPUT,
 180   IP6_FULL_REASSEMBLY_NEXT_DROP,
 181   IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
 182   IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
 183   IP6_FULL_REASSEMBLY_N_NEXT,
 184 } ip6_full_reass_next_t;
 185
 186 typedef enum
 187 {
 188   RANGE_NEW,
 189   RANGE_OVERLAP,
 190   ICMP_ERROR_RT_EXCEEDED,
 191   ICMP_ERROR_FL_TOO_BIG,
 192   ICMP_ERROR_FL_NOT_MULT_8,
 193   FINALIZE,
 194   HANDOFF,
 195 } ip6_full_reass_trace_operation_e;
 196
 197 typedef struct
 198 {
 199   u16 range_first;
 200   u16 range_last;
 201   u32 range_bi;
 202   i32 data_offset;
 203   u32 data_len;
 204   u32 first_bi;
 205 } ip6_full_reass_range_trace_t;
 206
 207 typedef struct
 208 {
 209   ip6_full_reass_trace_operation_e action;
 210   u32 reass_id;
 211   ip6_full_reass_range_trace_t trace_range;
 212   u32 op_id;
 213   u32 fragment_first;
 214   u32 fragment_last;
 215   u32 total_data_len;
 216   u32 thread_id;
 217   u32 thread_id_to;
 218   bool is_after_handoff;
 219   ip6_header_t ip6_header;
 220   ip6_frag_hdr_t ip6_frag_header;
 221 } ip6_full_reass_trace_t;
 222
 223 static void
 224 ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 225                               ip6_full_reass_range_trace_t * trace)
 226 {
 227   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 228   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 229   trace->range_first = vnb->ip.reass.range_first;
 230   trace->range_last = vnb->ip.reass.range_last;
 231   trace->data_offset = ip6_full_reass_buffer_get_data_offset (b);
 232   trace->data_len = ip6_full_reass_buffer_get_data_len (b);
 233   trace->range_bi = bi;
 234 }
 235
 236 static u8 *
 237 format_ip6_full_reass_range_trace (u8 * s, va_list * args)
 238 {
 239   ip6_full_reass_range_trace_t *trace =
 240     va_arg (*args, ip6_full_reass_range_trace_t *);
 241   s =
 242     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 243             trace->range_last, trace->data_offset, trace->data_len,
 244             trace->range_bi);
 245   return s;
 246 }
 247
 248 static u8 *
 249 format_ip6_full_reass_trace (u8 * s, va_list * args)
 250 {
 251   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 252   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 253   ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
 254   u32 indent = 0;
 255   if (~0 != t->reass_id)
 256     {
 257       if (t->is_after_handoff)
 258         {
 259           s =
 260             format (s, "%U\n", format_ip6_header, &t->ip6_header,
 261                     sizeof (t->ip6_header));
 262           s =
 263             format (s, "  %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
 264                     sizeof (t->ip6_frag_header));
 265           indent = 2;
 266         }
 267       s =
 268         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 269                 t->reass_id, t->op_id);
 270       indent = format_get_indent (s);
 271       s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 272                   t->trace_range.first_bi, t->total_data_len,
 273                   t->fragment_first, t->fragment_last);
 274     }
 275   switch (t->action)
 276     {
 277     case RANGE_NEW:
 278       s = format (s, "\n%Unew %U", format_white_space, indent,
 279                   format_ip6_full_reass_range_trace, &t->trace_range);
 280       break;
 281     case RANGE_OVERLAP:
 282       s = format (s, "\n%Uoverlap %U", format_white_space, indent,
 283                   format_ip6_full_reass_range_trace, &t->trace_range);
 284       break;
 285     case ICMP_ERROR_FL_TOO_BIG:
 286       s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
 287                   format_white_space, indent,
 288                   format_ip6_full_reass_range_trace, &t->trace_range);
 289       break;
 290     case ICMP_ERROR_FL_NOT_MULT_8:
 291       s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
 292                   format_white_space, indent,
 293                   format_ip6_full_reass_range_trace, &t->trace_range);
 294       break;
 295     case ICMP_ERROR_RT_EXCEEDED:
 296       s = format (s, "\n%Uicmp-error - reassembly time exceeded",
 297                   format_white_space, indent);
 298       break;
 299     case FINALIZE:
 300       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 301       break;
 302     case HANDOFF:
 303       s =
 304         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 305                 t->thread_id_to);
 306       break;
 307     }
 308   return s;
 309 }
 310
 311 static void
 312 ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 313                           ip6_full_reass_t * reass, u32 bi,
 314                           ip6_frag_hdr_t * ip6_frag_header,
 315                           ip6_full_reass_trace_operation_e action,
 316                           u32 thread_id_to)
 317 {
 318   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 319   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 320   bool is_after_handoff = false;
 321   if (pool_is_free_index
 322       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 323     {
 324       // this buffer's trace is gone
 325       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 326       return;
 327     }
 328   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 329     {
 330       is_after_handoff = true;
 331     }
 332   ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 333   t->is_after_handoff = is_after_handoff;
 334   if (t->is_after_handoff)
 335     {
 336       clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b),
 337                    clib_min (sizeof (t->ip6_header), b->current_length));
 338       if (ip6_frag_header)
 339         {
 340           clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
 341                        sizeof (t->ip6_frag_header));
 342         }
 343       else
 344         {
 345           clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
 346         }
 347     }
 348   if (reass)
 349     {
 350       t->reass_id = reass->id;
 351       t->op_id = reass->trace_op_counter;
 352       t->trace_range.first_bi = reass->first_bi;
 353       t->total_data_len = reass->data_len;
 354       ++reass->trace_op_counter;
 355     }
 356   else
 357     {
 358       t->reass_id = ~0;
 359     }
 360   t->action = action;
 361   t->thread_id = vm->thread_index;
 362   t->thread_id_to = thread_id_to;
 363   ip6_full_reass_trace_details (vm, bi, &t->trace_range);
 364   t->fragment_first = vnb->ip.reass.fragment_first;
 365   t->fragment_last = vnb->ip.reass.fragment_last;
 366 #if 0
 367   static u8 *s = NULL;
 368   s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t);
 369   printf ("%.*s\n", vec_len (s), s);
 370   fflush (stdout);
 371   vec_reset_length (s);
 372 #endif
 373 }
 374
 375 always_inline void
 376 ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
 377                          ip6_full_reass_t * reass)
 378 {
 379   pool_put (rt->pool, reass);
 380   --rt->reass_n;
 381 }
 382
 383 always_inline void
 384 ip6_full_reass_free (ip6_full_reass_main_t * rm,
 385                      ip6_full_reass_per_thread_t * rt,
 386                      ip6_full_reass_t * reass)
 387 {
 388   clib_bihash_kv_48_8_t kv;
 389   kv.key[0] = reass->key.as_u64[0];
 390   kv.key[1] = reass->key.as_u64[1];
 391   kv.key[2] = reass->key.as_u64[2];
 392   kv.key[3] = reass->key.as_u64[3];
 393   kv.key[4] = reass->key.as_u64[4];
 394   kv.key[5] = reass->key.as_u64[5];
 395   clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
 396   ip6_full_reass_free_ctx (rt, reass);
 397 }
 398
 399 always_inline void
 400 ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 401                          ip6_full_reass_t *reass)
 402 {
 403   u32 range_bi = reass->first_bi;
 404   vlib_buffer_t *range_b;
 405   vnet_buffer_opaque_t *range_vnb;
 406   u32 *to_free = NULL;
 407   while (~0 != range_bi)
 408     {
 409       range_b = vlib_get_buffer (vm, range_bi);
 410       range_vnb = vnet_buffer (range_b);
 411       u32 bi = range_bi;
 412       while (~0 != bi)
 413         {
 414           vec_add1 (to_free, bi);
 415           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 416           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 417             {
 418               bi = b->next_buffer;
 419               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 420             }
 421           else
 422             {
 423               bi = ~0;
 424             }
 425         }
 426       range_bi = range_vnb->ip.reass.next_range_bi;
 427     }
 428   /* send to next_error_index */
 429   if (~0 != reass->error_next_index)
 430     {
 431       u32 n_left_to_next, *to_next, next_index;
 432
 433       next_index = reass->error_next_index;
 434       u32 bi = ~0;
 435
 436       while (vec_len (to_free) > 0)
 437         {
 438           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 439
 440           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 441             {
 442               bi = vec_pop (to_free);
 443
 444               if (~0 != bi)
 445                 {
 446                   to_next[0] = bi;
 447                   to_next += 1;
 448                   n_left_to_next -= 1;
 449                 }
 450             }
 451           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 452         }
 453     }
 454   else
 455     {
 456       vlib_buffer_free (vm, to_free, vec_len (to_free));
 457     }
 458   vec_free (to_free);
 459 }
 460
 461 always_inline void
 462 ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
 463                            ip6_full_reass_t * reass, u32 * icmp_bi)
 464 {
 465   if (~0 == reass->first_bi)
 466     {
 467       return;
 468     }
 469   if (~0 == reass->next_index)  // custom apps don't want icmp
 470     {
 471       vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
 472       if (0 == vnet_buffer (b)->ip.reass.fragment_first)
 473         {
 474           *icmp_bi = reass->first_bi;
 475           if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 476             {
 477               ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 478                                         ICMP_ERROR_RT_EXCEEDED, ~0);
 479             }
 480           // fragment with offset zero received - send icmp message back
 481           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 482             {
 483               // separate first buffer from chain and steer it towards icmp node
 484               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 485               reass->first_bi = b->next_buffer;
 486             }
 487           else
 488             {
 489               reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
 490             }
 491           icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
 492                                        ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
 493                                        0);
 494         }
 495     }
 496   ip6_full_reass_drop_all (vm, node, reass);
 497 }
 498
 499 always_inline ip6_full_reass_t *
 500 ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 501                                ip6_full_reass_main_t * rm,
 502                                ip6_full_reass_per_thread_t * rt,
 503                                ip6_full_reass_kv_t * kv, u32 * icmp_bi,
 504                                u8 * do_handoff)
 505 {
 506   ip6_full_reass_t *reass;
 507   f64 now;
 508
 509 again:
 510
 511   reass = NULL;
 512   now = vlib_time_now (vm);
 513
 514   if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
 515     {
 516       if (vm->thread_index != kv->v.memory_owner_thread_index)
 517         {
 518           *do_handoff = 1;
 519           return NULL;
 520         }
 521
 522       reass =
 523         pool_elt_at_index (rm->per_thread_data
 524                            [kv->v.memory_owner_thread_index].pool,
 525                            kv->v.reass_index);
 526
 527       if (now > reass->last_heard + rm->timeout)
 528         {
 529           ip6_full_reass_on_timeout (vm, node, reass, icmp_bi);
 530           ip6_full_reass_free (rm, rt, reass);
 531           reass = NULL;
 532         }
 533     }
 534
 535   if (reass)
 536     {
 537       reass->last_heard = now;
 538       return reass;
 539     }
 540
 541   if (rt->reass_n >= rm->max_reass_n)
 542     {
 543       reass = NULL;
 544       return reass;
 545     }
 546   else
 547     {
 548       pool_get (rt->pool, reass);
 549       clib_memset (reass, 0, sizeof (*reass));
 550       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 551       ++rt->id_counter;
 552       reass->first_bi = ~0;
 553       reass->last_packet_octet = ~0;
 554       reass->data_len = 0;
 555       reass->next_index = ~0;
 556       reass->error_next_index = ~0;
 557       ++rt->reass_n;
 558     }
 559
 560   reass->key.as_u64[0] = kv->kv.key[0];
 561   reass->key.as_u64[1] = kv->kv.key[1];
 562   reass->key.as_u64[2] = kv->kv.key[2];
 563   reass->key.as_u64[3] = kv->kv.key[3];
 564   reass->key.as_u64[4] = kv->kv.key[4];
 565   reass->key.as_u64[5] = kv->kv.key[5];
 566   kv->v.reass_index = (reass - rt->pool);
 567   kv->v.memory_owner_thread_index = vm->thread_index;
 568   reass->last_heard = now;
 569
 570   int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
 571   if (rv)
 572     {
 573       ip6_full_reass_free (rm, rt, reass);
 574       reass = NULL;
 575       // if other worker created a context already work with the other copy
 576       if (-2 == rv)
 577         goto again;
 578     }
 579
 580   return reass;
 581 }
 582
 583 always_inline ip6_full_reass_rc_t
 584 ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 585                          ip6_full_reass_main_t * rm,
 586                          ip6_full_reass_per_thread_t * rt,
 587                          ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 588                          u32 * error0, bool is_custom_app)
 589 {
 590   *bi0 = reass->first_bi;
 591   *error0 = IP6_ERROR_NONE;
 592   ip6_frag_hdr_t *frag_hdr;
 593   vlib_buffer_t *last_b = NULL;
 594   u32 sub_chain_bi = reass->first_bi;
 595   u32 total_length = 0;
 596   u32 buf_cnt = 0;
 597   u32 dropped_cnt = 0;
 598   u32 *vec_drop_compress = NULL;
 599   ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
 600   do
 601     {
 602       u32 tmp_bi = sub_chain_bi;
 603       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 604       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 605       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 606           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 607         {
 608           rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 609           goto free_buffers_and_return;
 610         }
 611
 612       u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
 613       u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 614         sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp);
 615       u32 trim_end =
 616         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 617       if (tmp_bi == reass->first_bi)
 618         {
 619           /* first buffer - keep ip6 header */
 620           if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
 621             {
 622               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 623               goto free_buffers_and_return;
 624             }
 625           trim_front = 0;
 626           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 627             (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
 628              sizeof (*frag_hdr));
 629           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 630             {
 631               rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 632               goto free_buffers_and_return;
 633             }
 634         }
 635       u32 keep_data =
 636         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 637       while (1)
 638         {
 639           ++buf_cnt;
 640           if (trim_front)
 641             {
 642               if (trim_front > tmp->current_length)
 643                 {
 644                   /* drop whole buffer */
 645                   vec_add1 (vec_drop_compress, tmp_bi);
 646                   trim_front -= tmp->current_length;
 647                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 648                     {
 649                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 650                       goto free_buffers_and_return;
 651                     }
 652                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 653                   tmp_bi = tmp->next_buffer;
 654                   tmp = vlib_get_buffer (vm, tmp_bi);
 655                   continue;
 656                 }
 657               else
 658                 {
 659                   vlib_buffer_advance (tmp, trim_front);
 660                   trim_front = 0;
 661                 }
 662             }
 663           if (keep_data)
 664             {
 665               if (last_b)
 666                 {
 667                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 668                   last_b->next_buffer = tmp_bi;
 669                 }
 670               last_b = tmp;
 671               if (keep_data <= tmp->current_length)
 672                 {
 673                   tmp->current_length = keep_data;
 674                   keep_data = 0;
 675                 }
 676               else
 677                 {
 678                   keep_data -= tmp->current_length;
 679                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 680                     {
 681                       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 682                       goto free_buffers_and_return;
 683                     }
 684                 }
 685               total_length += tmp->current_length;
 686             }
 687           else
 688             {
 689               vec_add1 (vec_drop_compress, tmp_bi);
 690               if (reass->first_bi == tmp_bi)
 691                 {
 692                   rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 693                   goto free_buffers_and_return;
 694                 }
 695               ++dropped_cnt;
 696             }
 697           if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 698             {
 699               tmp_bi = tmp->next_buffer;
 700               tmp = vlib_get_buffer (vm, tmp->next_buffer);
 701             }
 702           else
 703             {
 704               break;
 705             }
 706         }
 707       sub_chain_bi =
 708         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 709         reass.next_range_bi;
 710     }
 711   while (~0 != sub_chain_bi);
 712
 713   if (!last_b)
 714     {
 715       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 716       goto free_buffers_and_return;
 717     }
 718   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 719   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 720   if (total_length < first_b->current_length)
 721     {
 722       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 723       goto free_buffers_and_return;
 724     }
 725   total_length -= first_b->current_length;
 726   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 727   first_b->total_length_not_including_first_buffer = total_length;
 728   // drop fragment header
 729   vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
 730   ip6_header_t *ip = vlib_buffer_get_current (first_b);
 731   u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
 732   ip6_ext_header_t *prev_hdr;
 733   frag_hdr =
 734     ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
 735                          &prev_hdr);
 736   if (prev_hdr)
 737     {
 738       prev_hdr->next_hdr = frag_hdr->next_hdr;
 739     }
 740   else
 741     {
 742       ip->protocol = frag_hdr->next_hdr;
 743     }
 744   if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
 745     {
 746       rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
 747       goto free_buffers_and_return;
 748     }
 749   memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
 750            first_b->current_length - ip6_frag_hdr_offset -
 751            sizeof (ip6_frag_hdr_t));
 752   first_b->current_length -= sizeof (*frag_hdr);
 753   ip->payload_length =
 754     clib_host_to_net_u16 (total_length + first_b->current_length -
 755                           sizeof (*ip));
 756   if (!vlib_buffer_chain_linearize (vm, first_b))
 757     {
 758       rv = IP6_FULL_REASS_RC_NO_BUF;
 759       goto free_buffers_and_return;
 760     }
 761   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 762   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 763     {
 764       ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
 765                                 FINALIZE, ~0);
 766 #if 0
 767       // following code does a hexdump of packet fragments to stdout ...
 768       do
 769         {
 770           u32 bi = reass->first_bi;
 771           u8 *s = NULL;
 772           while (~0 != bi)
 773             {
 774               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 775               s = format (s, "%u: %U\n", bi, format_hexdump,
 776                           vlib_buffer_get_current (b), b->current_length);
 777               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 778                 {
 779                   bi = b->next_buffer;
 780                 }
 781               else
 782                 {
 783                   break;
 784                 }
 785             }
 786           printf ("%.*s\n", vec_len (s), s);
 787           fflush (stdout);
 788           vec_free (s);
 789         }
 790       while (0);
 791 #endif
 792     }
 793   if (!is_custom_app)
 794     {
 795       *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
 796     }
 797   else
 798     {
 799       *next0 = reass->next_index;
 800     }
 801   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 802   ip6_full_reass_free (rm, rt, reass);
 803   reass = NULL;
 804 free_buffers_and_return:
 805   vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
 806   vec_free (vec_drop_compress);
 807   return rv;
 808 }
 809
 810 always_inline void
 811 ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
 812                                       ip6_full_reass_t * reass,
 813                                       u32 prev_range_bi, u32 new_next_bi)
 814 {
 815
 816   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 817   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 818   if (~0 != prev_range_bi)
 819     {
 820       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 821       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 822       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 823       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 824     }
 825   else
 826     {
 827       if (~0 != reass->first_bi)
 828         {
 829           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 830         }
 831       reass->first_bi = new_next_bi;
 832     }
 833   reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
 834 }
 835
 836 always_inline ip6_full_reass_rc_t
 837 ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 838                        ip6_full_reass_main_t * rm,
 839                        ip6_full_reass_per_thread_t * rt,
 840                        ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
 841                        u32 * error0, ip6_frag_hdr_t * frag_hdr,
 842                        bool is_custom_app, u32 * handoff_thread_idx)
 843 {
 844   int consumed = 0;
 845   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 846   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 847   if (is_custom_app)
 848     {
 849       reass->next_index = fvnb->ip.reass.next_index;    // store next_index before it's overwritten
 850       reass->error_next_index = fvnb->ip.reass.error_next_index;        // store error_next_index before it is overwritten
 851     }
 852
 853   fvnb->ip.reass.ip6_frag_hdr_offset =
 854     (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
 855   ip6_header_t *fip = vlib_buffer_get_current (fb);
 856   if (fb->current_length < sizeof (*fip) ||
 857       fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
 858       fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
 859     {
 860       return IP6_FULL_REASS_RC_INTERNAL_ERROR;
 861     }
 862
 863   u32 fragment_first = fvnb->ip.reass.fragment_first =
 864     ip6_frag_hdr_offset_bytes (frag_hdr);
 865   u32 fragment_length =
 866     vlib_buffer_length_in_chain (vm, fb) -
 867     (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
 868   u32 fragment_last = fvnb->ip.reass.fragment_last =
 869     fragment_first + fragment_length - 1;
 870   int more_fragments = ip6_frag_hdr_more (frag_hdr);
 871   u32 candidate_range_bi = reass->first_bi;
 872   u32 prev_range_bi = ~0;
 873   fvnb->ip.reass.range_first = fragment_first;
 874   fvnb->ip.reass.range_last = fragment_last;
 875   fvnb->ip.reass.next_range_bi = ~0;
 876   if (!more_fragments)
 877     {
 878       reass->last_packet_octet = fragment_last;
 879     }
 880   if (~0 == reass->first_bi)
 881     {
 882       // starting a new reassembly
 883       ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 884       reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
 885       consumed = 1;
 886       reass->fragments_n = 1;
 887       goto check_if_done_maybe;
 888     }
 889   reass->min_fragment_length =
 890     clib_min (clib_net_to_host_u16 (fip->payload_length),
 891               fvnb->ip.reass.estimated_mtu);
 892   while (~0 != candidate_range_bi)
 893     {
 894       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 895       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 896       if (fragment_first > candidate_vnb->ip.reass.range_last)
 897         {
 898           // this fragments starts after candidate range
 899           prev_range_bi = candidate_range_bi;
 900           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 901           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 902               ~0 == candidate_range_bi)
 903             {
 904               // special case - this fragment falls beyond all known ranges
 905               ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 906                                                     *bi0);
 907               consumed = 1;
 908               break;
 909             }
 910           continue;
 911         }
 912       if (fragment_last < candidate_vnb->ip.reass.range_first)
 913         {
 914           // this fragment ends before candidate range without any overlap
 915           ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 916                                                 *bi0);
 917           consumed = 1;
 918         }
 919       else if (fragment_first == candidate_vnb->ip.reass.range_first &&
 920                fragment_last == candidate_vnb->ip.reass.range_last)
 921         {
 922           // duplicate fragment - ignore
 923         }
 924       else
 925         {
 926           // overlapping fragment - not allowed by RFC 8200
 927           if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 928             {
 929               ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
 930                                         RANGE_OVERLAP, ~0);
 931             }
 932           ip6_full_reass_drop_all (vm, node, reass);
 933           ip6_full_reass_free (rm, rt, reass);
 934           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 935           *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
 936           return IP6_FULL_REASS_RC_OK;
 937         }
 938       break;
 939     }
 940   ++reass->fragments_n;
 941 check_if_done_maybe:
 942   if (consumed)
 943     {
 944       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 945         {
 946           ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
 947                                     ~0);
 948         }
 949     }
 950   if (~0 != reass->last_packet_octet &&
 951       reass->data_len == reass->last_packet_octet + 1)
 952     {
 953       *handoff_thread_idx = reass->sendout_thread_index;
 954       int handoff =
 955         reass->memory_owner_thread_index != reass->sendout_thread_index;
 956       ip6_full_reass_rc_t rc =
 957         ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
 958                                  is_custom_app);
 959       if (IP6_FULL_REASS_RC_OK == rc && handoff)
 960         {
 961           return IP6_FULL_REASS_RC_HANDOFF;
 962         }
 963       return rc;
 964     }
 965   else
 966     {
 967       if (consumed)
 968         {
 969           *bi0 = ~0;
 970           if (reass->fragments_n > rm->max_reass_len)
 971             {
 972               return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
 973             }
 974         }
 975       else
 976         {
 977           *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
 978           *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
 979         }
 980     }
 981   return IP6_FULL_REASS_RC_OK;
 982 }
 983
 984 always_inline bool
 985 ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
 986                                            vlib_buffer_t * b,
 987                                            ip6_frag_hdr_t * frag_hdr)
 988 {
 989   ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
 990   while (ip6_ext_hdr (tmp->next_hdr))
 991     {
 992       tmp = ip6_ext_next_header (tmp);
 993     }
 994   if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
 995     {
 996       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
 997                                    ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
 998                                    0);
 999       b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
1000
1001       return false;
1002     }
1003   return true;
1004 }
1005
1006 always_inline bool
1007 ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
1008                                            vlib_buffer_t * b,
1009                                            ip6_frag_hdr_t * frag_hdr)
1010 {
1011   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1012   ip6_header_t *ip = vlib_buffer_get_current (b);
1013   int more_fragments = ip6_frag_hdr_more (frag_hdr);
1014   u32 fragment_length =
1015     vlib_buffer_length_in_chain (vm, b) -
1016     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1017   if (more_fragments && 0 != fragment_length % 8)
1018     {
1019       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1020                                    ICMP6_parameter_problem_erroneous_header_field,
1021                                    (u8 *) & ip->payload_length - (u8 *) ip);
1022       return false;
1023     }
1024   return true;
1025 }
1026
1027 always_inline bool
1028 ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
1029                                           vlib_buffer_t * b,
1030                                           ip6_frag_hdr_t * frag_hdr)
1031 {
1032   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1033   u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
1034   u32 fragment_length =
1035     vlib_buffer_length_in_chain (vm, b) -
1036     (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
1037   if (fragment_first + fragment_length > 65535)
1038     {
1039       ip6_header_t *ip0 = vlib_buffer_get_current (b);
1040       icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
1041                                    ICMP6_parameter_problem_erroneous_header_field,
1042                                    (u8 *) & frag_hdr->fragment_offset_and_more
1043                                    - (u8 *) ip0);
1044       return false;
1045     }
1046   return true;
1047 }
1048
1049 always_inline uword
1050 ip6_full_reassembly_inline (vlib_main_t * vm,
1051                             vlib_node_runtime_t * node,
1052                             vlib_frame_t * frame, bool is_feature,
1053                             bool is_custom_app)
1054 {
1055   u32 *from = vlib_frame_vector_args (frame);
1056   u32 n_left_from, n_left_to_next, *to_next, next_index;
1057   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1058   ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1059   clib_spinlock_lock (&rt->lock);
1060
1061   n_left_from = frame->n_vectors;
1062   next_index = node->cached_next_index;
1063   while (n_left_from > 0)
1064     {
1065       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1066
1067       while (n_left_from > 0 && n_left_to_next > 0)
1068         {
1069           u32 bi0;
1070           vlib_buffer_t *b0;
1071           u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1072           u32 error0 = IP6_ERROR_NONE;
1073           u32 icmp_bi = ~0;
1074
1075           bi0 = from[0];
1076           b0 = vlib_get_buffer (vm, bi0);
1077
1078           ip6_header_t *ip0 = vlib_buffer_get_current (b0);
1079           ip6_frag_hdr_t *frag_hdr = NULL;
1080           ip6_ext_header_t *prev_hdr;
1081           if (ip6_ext_hdr (ip0->protocol))
1082             {
1083               frag_hdr =
1084                 ip6_ext_header_find (vm, b0, ip0,
1085                                      IP_PROTOCOL_IPV6_FRAGMENTATION,
1086                                      &prev_hdr);
1087             }
1088           if (!frag_hdr)
1089             {
1090               // this is a regular packet - no fragmentation
1091               next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
1092               goto skip_reass;
1093             }
1094           vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
1095             (u8 *) frag_hdr - (u8 *) ip0;
1096
1097           if (0 == ip6_frag_hdr_offset (frag_hdr))
1098             {
1099               // first fragment - verify upper-layer is present
1100               if (!ip6_full_reass_verify_upper_layer_present
1101                   (node, b0, frag_hdr))
1102                 {
1103                   next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1104                   goto skip_reass;
1105                 }
1106             }
1107           if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) ||
1108               !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr))
1109             {
1110               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1111               goto skip_reass;
1112             }
1113           ip6_full_reass_kv_t kv;
1114           u8 do_handoff = 0;
1115
1116           kv.k.as_u64[0] = ip0->src_address.as_u64[0];
1117           kv.k.as_u64[1] = ip0->src_address.as_u64[1];
1118           kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
1119           kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
1120           kv.k.as_u64[4] =
1121             ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
1122                             vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
1123             (u64) frag_hdr->identification;
1124           kv.k.as_u64[5] = ip0->protocol;
1125
1126           ip6_full_reass_t *reass =
1127             ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
1128                                            &do_handoff);
1129
1130           if (reass)
1131             {
1132               const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
1133               if (0 == fragment_first)
1134                 {
1135                   reass->sendout_thread_index = vm->thread_index;
1136                 }
1137             }
1138           if (PREDICT_FALSE (do_handoff))
1139             {
1140               next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1141               vnet_buffer (b0)->ip.reass.owner_thread_index =
1142                 kv.v.memory_owner_thread_index;
1143             }
1144           else if (reass)
1145             {
1146               u32 handoff_thread_idx;
1147               u32 counter = ~0;
1148               switch (ip6_full_reass_update
1149                       (vm, node, rm, rt, reass, &bi0, &next0, &error0,
1150                        frag_hdr, is_custom_app, &handoff_thread_idx))
1151                 {
1152                 case IP6_FULL_REASS_RC_OK:
1153                   /* nothing to do here */
1154                   break;
1155                 case IP6_FULL_REASS_RC_HANDOFF:
1156                   next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
1157                   b0 = vlib_get_buffer (vm, bi0);
1158                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1159                     handoff_thread_idx;
1160                   break;
1161                 case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
1162                   counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1163                   break;
1164                 case IP6_FULL_REASS_RC_NO_BUF:
1165                   counter = IP6_ERROR_REASS_NO_BUF;
1166                   break;
1167                 case IP6_FULL_REASS_RC_INTERNAL_ERROR:
1168                   counter = IP6_ERROR_REASS_INTERNAL_ERROR;
1169                   break;
1170                 }
1171               if (~0 != counter)
1172                 {
1173                   vlib_node_increment_counter (vm, node->node_index, counter,
1174                                                1);
1175                   ip6_full_reass_drop_all (vm, node, reass);
1176                   ip6_full_reass_free (rm, rt, reass);
1177                   goto next_packet;
1178                 }
1179             }
1180           else
1181             {
1182               if (is_feature)
1183                 {
1184                   next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
1185                 }
1186               else
1187                 {
1188                   vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
1189                   next0 = fvnb->ip.reass.error_next_index;
1190                 }
1191               error0 = IP6_ERROR_REASS_LIMIT_REACHED;
1192             }
1193
1194           if (~0 != bi0)
1195             {
1196             skip_reass:
1197               to_next[0] = bi0;
1198               to_next += 1;
1199               n_left_to_next -= 1;
1200
1201               /* bi0 might have been updated by reass_finalize, reload */
1202               b0 = vlib_get_buffer (vm, bi0);
1203               if (IP6_ERROR_NONE != error0)
1204                 {
1205                   b0->error = node->errors[error0];
1206                 }
1207
1208               if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
1209                 {
1210                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1211                     {
1212                       ip6_full_reass_add_trace (
1213                         vm, node, NULL, bi0, frag_hdr, HANDOFF,
1214                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1215                     }
1216                 }
1217               else if (is_feature && IP6_ERROR_NONE == error0)
1218                 {
1219                   vnet_feature_next (&next0, b0);
1220                 }
1221               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1222                                                n_left_to_next, bi0, next0);
1223             }
1224
1225           if (~0 != icmp_bi)
1226             {
1227               next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
1228               to_next[0] = icmp_bi;
1229               to_next += 1;
1230               n_left_to_next -= 1;
1231               vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
1232                                                n_left_to_next, icmp_bi,
1233                                                next0);
1234             }
1235         next_packet:
1236           from += 1;
1237           n_left_from -= 1;
1238         }
1239
1240       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1241     }
1242
1243   clib_spinlock_unlock (&rt->lock);
1244   return frame->n_vectors;
1245 }
1246
1247 static char *ip6_full_reassembly_error_strings[] = {
1248 #define _(sym, string) string,
1249   foreach_ip6_error
1250 #undef _
1251 };
1252
1253 VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
1254                                     vlib_node_runtime_t * node,
1255                                     vlib_frame_t * frame)
1256 {
1257   return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ ,
1258                                      false /* is_custom_app */ );
1259 }
1260
1261 VLIB_REGISTER_NODE (ip6_full_reass_node) = {
1262     .name = "ip6-full-reassembly",
1263     .vector_size = sizeof (u32),
1264     .format_trace = format_ip6_full_reass_trace,
1265     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1266     .error_strings = ip6_full_reassembly_error_strings,
1267     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1268     .next_nodes =
1269         {
1270                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1271                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1272                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1273                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
1274         },
1275 };
1276
1277 VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
1278                                             vlib_node_runtime_t * node,
1279                                             vlib_frame_t * frame)
1280 {
1281   return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ ,
1282                                      false /* is_custom_app */ );
1283 }
1284
1285 VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
1286     .name = "ip6-full-reassembly-feature",
1287     .vector_size = sizeof (u32),
1288     .format_trace = format_ip6_full_reass_trace,
1289     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1290     .error_strings = ip6_full_reassembly_error_strings,
1291     .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
1292     .next_nodes =
1293         {
1294                 [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
1295                 [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
1296                 [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
1297                 [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
1298         },
1299 };
1300
1301 VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
1302     .arc_name = "ip6-unicast",
1303     .node_name = "ip6-full-reassembly-feature",
1304     .runs_before = VNET_FEATURES ("ip6-lookup",
1305                                   "ipsec6-input-feature"),
1306     .runs_after = 0,
1307 };
1308
1309 #ifndef CLIB_MARCH_VARIANT
1310 static u32
1311 ip6_full_reass_get_nbuckets ()
1312 {
1313   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1314   u32 nbuckets;
1315   u8 i;
1316
1317   nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR);
1318
1319   for (i = 0; i < 31; i++)
1320     if ((1 << i) >= nbuckets)
1321       break;
1322   nbuckets = 1 << i;
1323
1324   return nbuckets;
1325 }
1326 #endif /* CLIB_MARCH_VARIANT */
1327
1328 typedef enum
1329 {
1330   IP6_EVENT_CONFIG_CHANGED = 1,
1331 } ip6_full_reass_event_t;
1332
1333 #ifndef CLIB_MARCH_VARIANT
1334 typedef struct
1335 {
1336   int failure;
1337   clib_bihash_48_8_t *new_hash;
1338 } ip6_rehash_cb_ctx;
1339
1340 static int
1341 ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
1342 {
1343   ip6_rehash_cb_ctx *ctx = _ctx;
1344   if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
1345     {
1346       ctx->failure = 1;
1347     }
1348   return (BIHASH_WALK_CONTINUE);
1349 }
1350
1351 static void
1352 ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1353                            u32 max_reassembly_length,
1354                            u32 expire_walk_interval_ms)
1355 {
1356   ip6_full_reass_main.timeout_ms = timeout_ms;
1357   ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1358   ip6_full_reass_main.max_reass_n = max_reassemblies;
1359   ip6_full_reass_main.max_reass_len = max_reassembly_length;
1360   ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1361 }
1362
1363 vnet_api_error_t
1364 ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1365                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1366 {
1367   u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
1368   ip6_full_reass_set_params (timeout_ms, max_reassemblies,
1369                              max_reassembly_length, expire_walk_interval_ms);
1370   vlib_process_signal_event (ip6_full_reass_main.vlib_main,
1371                              ip6_full_reass_main.ip6_full_reass_expire_node_idx,
1372                              IP6_EVENT_CONFIG_CHANGED, 0);
1373   u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
1374   if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1375     {
1376       clib_bihash_48_8_t new_hash;
1377       clib_memset (&new_hash, 0, sizeof (new_hash));
1378       ip6_rehash_cb_ctx ctx;
1379       ctx.failure = 0;
1380       ctx.new_hash = &new_hash;
1381       clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets,
1382                              new_nbuckets * 1024);
1383       clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash,
1384                                                ip6_rehash_cb, &ctx);
1385       if (ctx.failure)
1386         {
1387           clib_bihash_free_48_8 (&new_hash);
1388           return -1;
1389         }
1390       else
1391         {
1392           clib_bihash_free_48_8 (&ip6_full_reass_main.hash);
1393           clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
1394                             sizeof (ip6_full_reass_main.hash));
1395           clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
1396         }
1397     }
1398   return 0;
1399 }
1400
1401 vnet_api_error_t
1402 ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1403                     u32 * max_reassembly_length,
1404                     u32 * expire_walk_interval_ms)
1405 {
1406   *timeout_ms = ip6_full_reass_main.timeout_ms;
1407   *max_reassemblies = ip6_full_reass_main.max_reass_n;
1408   *max_reassembly_length = ip6_full_reass_main.max_reass_len;
1409   *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
1410   return 0;
1411 }
1412
1413 static clib_error_t *
1414 ip6_full_reass_init_function (vlib_main_t * vm)
1415 {
1416   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1417   clib_error_t *error = 0;
1418   u32 nbuckets;
1419   vlib_node_t *node;
1420
1421   rm->vlib_main = vm;
1422
1423   vec_validate (rm->per_thread_data, vlib_num_workers ());
1424   ip6_full_reass_per_thread_t *rt;
1425   vec_foreach (rt, rm->per_thread_data)
1426   {
1427     clib_spinlock_init (&rt->lock);
1428     pool_alloc (rt->pool, rm->max_reass_n);
1429   }
1430
1431   node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk");
1432   ASSERT (node);
1433   rm->ip6_full_reass_expire_node_idx = node->index;
1434
1435   ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
1436                              IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
1437                              IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1438                              IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1439
1440   nbuckets = ip6_full_reass_get_nbuckets ();
1441   clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
1442                          nbuckets * 1024);
1443
1444   node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
1445   ASSERT (node);
1446   rm->ip6_drop_idx = node->index;
1447   node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
1448   ASSERT (node);
1449   rm->ip6_icmp_error_idx = node->index;
1450
1451   if ((error = vlib_call_init_function (vm, ip_main_init)))
1452     return error;
1453   ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
1454                          ip6_full_reass_node.index);
1455
1456   rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
1457   rm->fq_feature_index =
1458     vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
1459
1460   rm->feature_use_refcount_per_intf = NULL;
1461   return error;
1462 }
1463
1464 VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
1465 #endif /* CLIB_MARCH_VARIANT */
1466
1467 static uword
1468 ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1469                              CLIB_UNUSED (vlib_frame_t *f))
1470 {
1471   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1472   uword event_type, *event_data = 0;
1473
1474   while (true)
1475     {
1476       vlib_process_wait_for_event_or_clock (vm,
1477                                             (f64) rm->expire_walk_interval_ms
1478                                             / (f64) MSEC_PER_SEC);
1479       event_type = vlib_process_get_events (vm, &event_data);
1480
1481       switch (event_type)
1482         {
1483         case ~0:
1484           /* no events => timeout */
1485           /* fallthrough */
1486         case IP6_EVENT_CONFIG_CHANGED:
1487           /* nothing to do here */
1488           break;
1489         default:
1490           clib_warning ("BUG: event type 0x%wx", event_type);
1491           break;
1492         }
1493       f64 now = vlib_time_now (vm);
1494
1495       ip6_full_reass_t *reass;
1496       int *pool_indexes_to_free = NULL;
1497
1498       uword thread_index = 0;
1499       int index;
1500       const uword nthreads = vlib_num_workers () + 1;
1501       u32 *vec_icmp_bi = NULL;
1502       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1503         {
1504           ip6_full_reass_per_thread_t *rt =
1505             &rm->per_thread_data[thread_index];
1506           clib_spinlock_lock (&rt->lock);
1507
1508           vec_reset_length (pool_indexes_to_free);
1509           pool_foreach_index (index, rt->pool)  {
1510                                 reass = pool_elt_at_index (rt->pool, index);
1511                                 if (now > reass->last_heard + rm->timeout)
1512                                   {
1513                                     vec_add1 (pool_indexes_to_free, index);
1514                                   }
1515                               }
1516           int *i;
1517           vec_foreach (i, pool_indexes_to_free)
1518           {
1519             ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1520             u32 icmp_bi = ~0;
1521             ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi);
1522             if (~0 != icmp_bi)
1523               vec_add1 (vec_icmp_bi, icmp_bi);
1524
1525             ip6_full_reass_free (rm, rt, reass);
1526           }
1527
1528           clib_spinlock_unlock (&rt->lock);
1529         }
1530
1531       while (vec_len (vec_icmp_bi) > 0)
1532         {
1533           vlib_frame_t *f =
1534             vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
1535           u32 *to_next = vlib_frame_vector_args (f);
1536           u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
1537           int trace_frame = 0;
1538           while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
1539             {
1540               u32 bi = vec_pop (vec_icmp_bi);
1541               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1542               if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
1543                 trace_frame = 1;
1544               b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
1545               to_next[0] = bi;
1546               ++f->n_vectors;
1547               to_next += 1;
1548               n_left_to_next -= 1;
1549             }
1550           f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
1551           vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
1552         }
1553
1554       vec_free (pool_indexes_to_free);
1555       vec_free (vec_icmp_bi);
1556       if (event_data)
1557         {
1558           _vec_len (event_data) = 0;
1559         }
1560     }
1561
1562   return 0;
1563 }
1564
1565 VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
1566     .function = ip6_full_reass_walk_expired,
1567     .format_trace = format_ip6_full_reass_trace,
1568     .type = VLIB_NODE_TYPE_PROCESS,
1569     .name = "ip6-full-reassembly-expire-walk",
1570
1571     .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings),
1572     .error_strings = ip6_full_reassembly_error_strings,
1573
1574 };
1575
1576 static u8 *
1577 format_ip6_full_reass_key (u8 * s, va_list * args)
1578 {
1579   ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *);
1580   s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1581               key->xx_id, format_ip6_address, &key->src, format_ip6_address,
1582               &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1583   return s;
1584 }
1585
1586 static u8 *
1587 format_ip6_full_reass (u8 * s, va_list * args)
1588 {
1589   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1590   ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *);
1591
1592   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1593               "last_packet_octet: %u, trace_op_counter: %u\n",
1594               reass->id, format_ip6_full_reass_key, &reass->key,
1595               reass->first_bi, reass->data_len, reass->last_packet_octet,
1596               reass->trace_op_counter);
1597   u32 bi = reass->first_bi;
1598   u32 counter = 0;
1599   while (~0 != bi)
1600     {
1601       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1602       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1603       s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1604                   "fragment[%u, %u]\n",
1605                   counter, vnb->ip.reass.range_first,
1606                   vnb->ip.reass.range_last, bi,
1607                   ip6_full_reass_buffer_get_data_offset (b),
1608                   ip6_full_reass_buffer_get_data_len (b),
1609                   vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1610       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1611         {
1612           bi = b->next_buffer;
1613         }
1614       else
1615         {
1616           bi = ~0;
1617         }
1618     }
1619   return s;
1620 }
1621
1622 static clib_error_t *
1623 show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
1624                      CLIB_UNUSED (vlib_cli_command_t * lmd))
1625 {
1626   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1627
1628   vlib_cli_output (vm, "---------------------");
1629   vlib_cli_output (vm, "IP6 reassembly status");
1630   vlib_cli_output (vm, "---------------------");
1631   bool details = false;
1632   if (unformat (input, "details"))
1633     {
1634       details = true;
1635     }
1636
1637   u32 sum_reass_n = 0;
1638   u64 sum_buffers_n = 0;
1639   ip6_full_reass_t *reass;
1640   uword thread_index;
1641   const uword nthreads = vlib_num_workers () + 1;
1642   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1643     {
1644       ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1645       clib_spinlock_lock (&rt->lock);
1646       if (details)
1647         {
1648           pool_foreach (reass, rt->pool) {
1649             vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
1650           }
1651         }
1652       sum_reass_n += rt->reass_n;
1653       clib_spinlock_unlock (&rt->lock);
1654     }
1655   vlib_cli_output (vm, "---------------------");
1656   vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
1657                    (long unsigned) sum_reass_n);
1658   vlib_cli_output (vm,
1659                    "Maximum configured concurrent full IP6 reassemblies per worker-thread: %lu\n",
1660                    (long unsigned) rm->max_reass_n);
1661   vlib_cli_output (vm,
1662                    "Maximum configured amount of fragments "
1663                    "per full IP6 reassembly: %lu\n",
1664                    (long unsigned) rm->max_reass_len);
1665   vlib_cli_output (vm,
1666                    "Maximum configured full IP6 reassembly timeout: %lums\n",
1667                    (long unsigned) rm->timeout_ms);
1668   vlib_cli_output (vm,
1669                    "Maximum configured full IP6 reassembly expire walk interval: %lums\n",
1670                    (long unsigned) rm->expire_walk_interval_ms);
1671   vlib_cli_output (vm, "Buffers in use: %lu\n",
1672                    (long unsigned) sum_buffers_n);
1673   return 0;
1674 }
1675
1676 VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
1677     .path = "show ip6-full-reassembly",
1678     .short_help = "show ip6-full-reassembly [details]",
1679     .function = show_ip6_full_reass,
1680 };
1681
1682 #ifndef CLIB_MARCH_VARIANT
1683 vnet_api_error_t
1684 ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1685 {
1686   return vnet_feature_enable_disable ("ip6-unicast",
1687                                       "ip6-full-reassembly-feature",
1688                                       sw_if_index, enable_disable, 0, 0);
1689 }
1690 #endif /* CLIB_MARCH_VARIANT */
1691
1692 #define foreach_ip6_full_reassembly_handoff_error                       \
1693 _(CONGESTION_DROP, "congestion drop")
1694
1695
1696 typedef enum
1697 {
1698 #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
1699   foreach_ip6_full_reassembly_handoff_error
1700 #undef _
1701     IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
1702 } ip6_full_reassembly_handoff_error_t;
1703
1704 static char *ip6_full_reassembly_handoff_error_strings[] = {
1705 #define _(sym,string) string,
1706   foreach_ip6_full_reassembly_handoff_error
1707 #undef _
1708 };
1709
1710 typedef struct
1711 {
1712   u32 next_worker_index;
1713 } ip6_full_reassembly_handoff_trace_t;
1714
1715 static u8 *
1716 format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args)
1717 {
1718   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1719   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1720   ip6_full_reassembly_handoff_trace_t *t =
1721     va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
1722
1723   s =
1724     format (s, "ip6-full-reassembly-handoff: next-worker %d",
1725             t->next_worker_index);
1726
1727   return s;
1728 }
1729
1730 always_inline uword
1731 ip6_full_reassembly_handoff_inline (vlib_main_t * vm,
1732                                     vlib_node_runtime_t * node,
1733                                     vlib_frame_t * frame, bool is_feature)
1734 {
1735   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1736
1737   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1738   u32 n_enq, n_left_from, *from;
1739   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1740   u32 fq_index;
1741
1742   from = vlib_frame_vector_args (frame);
1743   n_left_from = frame->n_vectors;
1744   vlib_get_buffers (vm, from, bufs, n_left_from);
1745
1746   b = bufs;
1747   ti = thread_indices;
1748
1749   fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
1750
1751   while (n_left_from > 0)
1752     {
1753       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1754
1755       if (PREDICT_FALSE
1756           ((node->flags & VLIB_NODE_FLAG_TRACE)
1757            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1758         {
1759           ip6_full_reassembly_handoff_trace_t *t =
1760             vlib_add_trace (vm, node, b[0], sizeof (*t));
1761           t->next_worker_index = ti[0];
1762         }
1763
1764       n_left_from -= 1;
1765       ti += 1;
1766       b += 1;
1767     }
1768   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1769                                          thread_indices, frame->n_vectors, 1);
1770
1771   if (n_enq < frame->n_vectors)
1772     vlib_node_increment_counter (vm, node->node_index,
1773                                  IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
1774                                  frame->n_vectors - n_enq);
1775   return frame->n_vectors;
1776 }
1777
1778 VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
1779                                                  vlib_node_runtime_t * node,
1780                                                  vlib_frame_t * frame)
1781 {
1782   return ip6_full_reassembly_handoff_inline (vm, node, frame,
1783                                              false /* is_feature */ );
1784 }
1785
1786 VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
1787   .name = "ip6-full-reassembly-handoff",
1788   .vector_size = sizeof (u32),
1789   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1790   .error_strings = ip6_full_reassembly_handoff_error_strings,
1791   .format_trace = format_ip6_full_reassembly_handoff_trace,
1792
1793   .n_next_nodes = 1,
1794
1795   .next_nodes = {
1796     [0] = "error-drop",
1797   },
1798 };
1799
1800
1801 VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
1802                                vlib_node_runtime_t * node, vlib_frame_t * frame)
1803 {
1804   return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
1805 }
1806
1807
1808 VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
1809   .name = "ip6-full-reass-feature-hoff",
1810   .vector_size = sizeof (u32),
1811   .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
1812   .error_strings = ip6_full_reassembly_handoff_error_strings,
1813   .format_trace = format_ip6_full_reassembly_handoff_trace,
1814
1815   .n_next_nodes = 1,
1816
1817   .next_nodes = {
1818     [0] = "error-drop",
1819   },
1820 };
1821
1822 #ifndef CLIB_MARCH_VARIANT
1823 int
1824 ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1825 {
1826   ip6_full_reass_main_t *rm = &ip6_full_reass_main;
1827   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1828   if (is_enable)
1829     {
1830       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1831         {
1832           ++rm->feature_use_refcount_per_intf[sw_if_index];
1833           return vnet_feature_enable_disable ("ip6-unicast",
1834                                               "ip6-full-reassembly-feature",
1835                                               sw_if_index, 1, 0, 0);
1836         }
1837       ++rm->feature_use_refcount_per_intf[sw_if_index];
1838     }
1839   else
1840     {
1841       --rm->feature_use_refcount_per_intf[sw_if_index];
1842       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1843         return vnet_feature_enable_disable ("ip6-unicast",
1844                                             "ip6-full-reassembly-feature",
1845                                             sw_if_index, 0, 0, 0);
1846     }
1847   return -1;
1848 }
1849 #endif
1850
1851 /*
1852  * fd.io coding-style-patch-verification: ON
1853  *
1854  * Local Variables:
1855  * eval: (c-set-style "gnu")
1856  * End:
1857  */