src/vnet/ip/reass/ip4_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 IPv4 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv4 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vnet/ip/ip.api_enum.h>
  27 #include <vppinfra/fifo.h>
  28 #include <vppinfra/bihash_16_8.h>
  29 #include <vnet/ip/reass/ip4_full_reass.h>
  30 #include <stddef.h>
  31
  32 #define MSEC_PER_SEC 1000
  33 #define IP4_REASS_TIMEOUT_DEFAULT_MS 200
  34
  35 /* As there are only 1024 reass context per thread, either the DDOS attacks
  36  * or fractions of real timeouts, would consume these contexts quickly and
  37  * running out context space and unable to perform reassembly */
  38 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 50 // 50 ms default
  39 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  40 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT   3
  41 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
  42
  43 #define IP4_REASS_DEBUG_BUFFERS 0
  44 #if IP4_REASS_DEBUG_BUFFERS
  45 #define IP4_REASS_DEBUG_BUFFER(bi, what)             \
  46   do                                                 \
  47     {                                                \
  48       u32 _bi = bi;                                  \
  49       printf (#what "buffer %u", _bi);               \
  50       vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
  51       while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)   \
  52         {                                            \
  53           _bi = _b->next_buffer;                     \
  54           printf ("[%u]", _bi);                      \
  55           _b = vlib_get_buffer (vm, _bi);            \
  56         }                                            \
  57       printf ("\n");                                 \
  58       fflush (stdout);                               \
  59     }                                                \
  60   while (0)
  61 #else
  62 #define IP4_REASS_DEBUG_BUFFER(...)
  63 #endif
  64
  65 typedef enum
  66 {
  67   IP4_REASS_RC_OK,
  68   IP4_REASS_RC_TOO_MANY_FRAGMENTS,
  69   IP4_REASS_RC_INTERNAL_ERROR,
  70   IP4_REASS_RC_NO_BUF,
  71   IP4_REASS_RC_HANDOFF,
  72 } ip4_full_reass_rc_t;
  73
  74 typedef struct
  75 {
  76   struct
  77   {
  78     u16 frag_id;
  79     u8 proto;
  80     u8 unused;
  81     u32 fib_index;
  82     ip4_address_t src;
  83     ip4_address_t dst;
  84   };
  85 } ip4_full_reass_key_t;
  86
  87 STATIC_ASSERT_SIZEOF (ip4_full_reass_key_t, 16);
  88
  89 typedef union
  90 {
  91   struct
  92   {
  93     u32 reass_index;
  94     u32 memory_owner_thread_index;
  95   };
  96   u64 as_u64;
  97 } ip4_full_reass_val_t;
  98
  99 typedef union
 100 {
 101   struct
 102   {
 103     ip4_full_reass_key_t k;
 104     ip4_full_reass_val_t v;
 105   };
 106   clib_bihash_kv_16_8_t kv;
 107 } ip4_full_reass_kv_t;
 108
 109 always_inline u32
 110 ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
 111 {
 112   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 113   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
 114 }
 115
 116 always_inline u16
 117 ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
 118 {
 119   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 120   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 121     (vnb->ip.reass.fragment_first +
 122      ip4_full_reass_buffer_get_data_offset (b)) + 1;
 123 }
 124
 125 typedef struct
 126 {
 127   // hash table key
 128   ip4_full_reass_key_t key;
 129   // time when last packet was received
 130   f64 last_heard;
 131   // internal id of this reassembly
 132   u64 id;
 133   // buffer index of first buffer in this reassembly context
 134   u32 first_bi;
 135   // last octet of packet, ~0 until fragment without more_fragments arrives
 136   u32 last_packet_octet;
 137   // length of data collected so far
 138   u32 data_len;
 139   // trace operation counter
 140   u32 trace_op_counter;
 141   // next index - used by non-feature node
 142   u32 next_index;
 143   // error next index - used by custom apps (~0 if not used)
 144   u32 error_next_index;
 145   // minimum fragment length for this reassembly - used to estimate MTU
 146   u16 min_fragment_length;
 147   // number of fragments in this reassembly
 148   u32 fragments_n;
 149   // thread owning memory for this context (whose pool contains this ctx)
 150   u32 memory_owner_thread_index;
 151   // thread which received fragment with offset 0 and which sends out the
 152   // completed reassembly
 153   u32 sendout_thread_index;
 154 } ip4_full_reass_t;
 155
 156 typedef struct
 157 {
 158   ip4_full_reass_t *pool;
 159   u32 reass_n;
 160   u32 id_counter;
 161   // for pacing the main thread timeouts
 162   u32 last_id;
 163   clib_spinlock_t lock;
 164 } ip4_full_reass_per_thread_t;
 165
 166 typedef struct
 167 {
 168   // IPv4 config
 169   u32 timeout_ms;
 170   f64 timeout;
 171   u32 expire_walk_interval_ms;
 172   // maximum number of fragments in one reassembly
 173   u32 max_reass_len;
 174   // maximum number of reassemblies
 175   u32 max_reass_n;
 176
 177   // IPv4 runtime
 178   clib_bihash_16_8_t hash;
 179   // per-thread data
 180   ip4_full_reass_per_thread_t *per_thread_data;
 181
 182   // convenience
 183   vlib_main_t *vlib_main;
 184
 185   u32 ip4_full_reass_expire_node_idx;
 186
 187   /** Worker handoff */
 188   u32 fq_index;
 189   u32 fq_local_index;
 190   u32 fq_feature_index;
 191   u32 fq_custom_index;
 192
 193   // reference count for enabling/disabling feature - per interface
 194   u32 *feature_use_refcount_per_intf;
 195
 196   // whether local fragmented packets are reassembled or not
 197   int is_local_reass_enabled;
 198 } ip4_full_reass_main_t;
 199
 200 extern ip4_full_reass_main_t ip4_full_reass_main;
 201
 202 #ifndef CLIB_MARCH_VARIANT
 203 ip4_full_reass_main_t ip4_full_reass_main;
 204 #endif /* CLIB_MARCH_VARIANT */
 205
 206 typedef enum
 207 {
 208   IP4_FULL_REASS_NEXT_INPUT,
 209   IP4_FULL_REASS_NEXT_DROP,
 210   IP4_FULL_REASS_NEXT_HANDOFF,
 211   IP4_FULL_REASS_N_NEXT,
 212 } ip4_full_reass_next_t;
 213
 214 typedef enum
 215 {
 216   NORMAL,
 217   FEATURE,
 218   CUSTOM
 219 } ip4_full_reass_node_type_t;
 220
 221 typedef enum
 222 {
 223   RANGE_NEW,
 224   RANGE_SHRINK,
 225   RANGE_DISCARD,
 226   RANGE_OVERLAP,
 227   FINALIZE,
 228   HANDOFF,
 229   PASSTHROUGH,
 230 } ip4_full_reass_trace_operation_e;
 231
 232 typedef struct
 233 {
 234   u16 range_first;
 235   u16 range_last;
 236   u32 range_bi;
 237   i32 data_offset;
 238   u32 data_len;
 239   u32 first_bi;
 240 } ip4_full_reass_range_trace_t;
 241
 242 typedef struct
 243 {
 244   ip4_full_reass_trace_operation_e action;
 245   u32 reass_id;
 246   ip4_full_reass_range_trace_t trace_range;
 247   u32 size_diff;
 248   u32 op_id;
 249   u32 thread_id;
 250   u32 thread_id_to;
 251   u32 fragment_first;
 252   u32 fragment_last;
 253   u32 total_data_len;
 254   bool is_after_handoff;
 255   ip4_header_t ip4_header;
 256 } ip4_full_reass_trace_t;
 257
 258 extern vlib_node_registration_t ip4_full_reass_node;
 259 extern vlib_node_registration_t ip4_full_reass_node_feature;
 260 extern vlib_node_registration_t ip4_full_reass_node_custom;
 261
 262 static void
 263 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 264                               ip4_full_reass_range_trace_t * trace)
 265 {
 266   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 267   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 268   trace->range_first = vnb->ip.reass.range_first;
 269   trace->range_last = vnb->ip.reass.range_last;
 270   trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
 271   trace->data_len = ip4_full_reass_buffer_get_data_len (b);
 272   trace->range_bi = bi;
 273 }
 274
 275 static u8 *
 276 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
 277 {
 278   ip4_full_reass_range_trace_t *trace =
 279     va_arg (*args, ip4_full_reass_range_trace_t *);
 280   s =
 281     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 282             trace->range_last, trace->data_offset, trace->data_len,
 283             trace->range_bi);
 284   return s;
 285 }
 286
 287 static u8 *
 288 format_ip4_full_reass_trace (u8 * s, va_list * args)
 289 {
 290   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 291   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 292   ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
 293   u32 indent = 0;
 294   if (~0 != t->reass_id)
 295     {
 296       if (t->is_after_handoff)
 297         {
 298           s =
 299             format (s, "%U\n", format_ip4_header, &t->ip4_header,
 300                     sizeof (t->ip4_header));
 301           indent = 2;
 302         }
 303       s =
 304         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 305                 t->reass_id, t->op_id);
 306       indent = format_get_indent (s);
 307       s =
 308         format (s,
 309                 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 310                 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 311                 t->fragment_last);
 312     }
 313   switch (t->action)
 314     {
 315     case RANGE_SHRINK:
 316       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 317                   format_ip4_full_reass_range_trace, &t->trace_range,
 318                   t->size_diff);
 319       break;
 320     case RANGE_DISCARD:
 321       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 322                   format_ip4_full_reass_range_trace, &t->trace_range);
 323       break;
 324     case RANGE_NEW:
 325       s = format (s, "\n%Unew %U", format_white_space, indent,
 326                   format_ip4_full_reass_range_trace, &t->trace_range);
 327       break;
 328     case RANGE_OVERLAP:
 329       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 330                   format_ip4_full_reass_range_trace, &t->trace_range);
 331       break;
 332     case FINALIZE:
 333       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 334       break;
 335     case HANDOFF:
 336       s =
 337         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 338                 t->thread_id_to);
 339       break;
 340     case PASSTHROUGH:
 341       s = format (s, "passthrough - not a fragment");
 342       break;
 343     }
 344   return s;
 345 }
 346
 347 static void
 348 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 349                           ip4_full_reass_t * reass, u32 bi,
 350                           ip4_full_reass_trace_operation_e action,
 351                           u32 size_diff, u32 thread_id_to)
 352 {
 353   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 354   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 355   if (pool_is_free_index
 356       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 357     {
 358       // this buffer's trace is gone
 359       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 360       return;
 361     }
 362   bool is_after_handoff = false;
 363   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 364     {
 365       is_after_handoff = true;
 366     }
 367   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 368   t->is_after_handoff = is_after_handoff;
 369   if (t->is_after_handoff)
 370     {
 371       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 372                    clib_min (sizeof (t->ip4_header), b->current_length));
 373     }
 374   if (reass)
 375     {
 376       t->reass_id = reass->id;
 377       t->op_id = reass->trace_op_counter;
 378       t->trace_range.first_bi = reass->first_bi;
 379       t->total_data_len = reass->data_len;
 380       ++reass->trace_op_counter;
 381     }
 382   else
 383     {
 384       t->reass_id = ~0;
 385       t->op_id = 0;
 386       t->trace_range.first_bi = 0;
 387       t->total_data_len = 0;
 388     }
 389   t->action = action;
 390   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 391   t->size_diff = size_diff;
 392   t->thread_id = vm->thread_index;
 393   t->thread_id_to = thread_id_to;
 394   t->fragment_first = vnb->ip.reass.fragment_first;
 395   t->fragment_last = vnb->ip.reass.fragment_last;
 396 #if 0
 397   static u8 *s = NULL;
 398   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 399   printf ("%.*s\n", vec_len (s), s);
 400   fflush (stdout);
 401   vec_reset_length (s);
 402 #endif
 403 }
 404
 405 always_inline void
 406 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 407                          ip4_full_reass_t * reass)
 408 {
 409   pool_put (rt->pool, reass);
 410   --rt->reass_n;
 411 }
 412
 413 always_inline void
 414 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 415                      ip4_full_reass_per_thread_t * rt,
 416                      ip4_full_reass_t * reass)
 417 {
 418   clib_bihash_kv_16_8_t kv = {};
 419   clib_memcpy_fast (&kv, &reass->key, sizeof (kv.key));
 420   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 421   return ip4_full_reass_free_ctx (rt, reass);
 422 }
 423
 424 /* n_left_to_next, and to_next are taken as input params, as this function
 425  * could be called from a graphnode, where its managing local copy of these
 426  * variables, and ignoring those and still trying to enqueue the buffers
 427  * with local variables would cause either buffer leak or corruption */
 428 always_inline void
 429 ip4_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 430                          ip4_full_reass_t *reass, u32 *n_left_to_next,
 431                          u32 **to_next)
 432 {
 433   u32 range_bi = reass->first_bi;
 434   vlib_buffer_t *range_b;
 435   vnet_buffer_opaque_t *range_vnb;
 436   u32 *to_free = NULL;
 437
 438   while (~0 != range_bi)
 439     {
 440       range_b = vlib_get_buffer (vm, range_bi);
 441       range_vnb = vnet_buffer (range_b);
 442
 443       if (~0 != range_bi)
 444         {
 445           vec_add1 (to_free, range_bi);
 446         }
 447
 448       range_bi = range_vnb->ip.reass.next_range_bi;
 449     }
 450
 451   /* send to next_error_index */
 452   if (~0 != reass->error_next_index &&
 453       reass->error_next_index < node->n_next_nodes)
 454     {
 455       u32 next_index;
 456
 457       next_index = reass->error_next_index;
 458       u32 bi = ~0;
 459
 460       /* record number of packets sent to custom app */
 461       vlib_node_increment_counter (vm, node->node_index,
 462                                    IP4_ERROR_REASS_TO_CUSTOM_APP,
 463                                    vec_len (to_free));
 464
 465       while (vec_len (to_free) > 0)
 466         {
 467           vlib_get_next_frame (vm, node, next_index, *to_next,
 468                                (*n_left_to_next));
 469
 470           while (vec_len (to_free) > 0 && (*n_left_to_next) > 0)
 471             {
 472               bi = vec_pop (to_free);
 473
 474               if (~0 != bi)
 475                 {
 476                   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 477                   if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
 478                     {
 479                       ip4_full_reass_add_trace (vm, node, reass, bi,
 480                                                 RANGE_DISCARD, 0, ~0);
 481                     }
 482                   *to_next[0] = bi;
 483                   (*to_next) += 1;
 484                   (*n_left_to_next) -= 1;
 485                 }
 486             }
 487           vlib_put_next_frame (vm, node, next_index, (*n_left_to_next));
 488         }
 489     }
 490   else
 491     {
 492       vlib_buffer_free (vm, to_free, vec_len (to_free));
 493     }
 494   vec_free (to_free);
 495 }
 496
 497 always_inline void
 498 sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip4_full_reass_t *reass,
 499                                     u32 *bi0)
 500 {
 501   u32 range_bi = reass->first_bi;
 502   vlib_buffer_t *range_b;
 503   vnet_buffer_opaque_t *range_vnb;
 504
 505   while (~0 != range_bi)
 506     {
 507       range_b = vlib_get_buffer (vm, range_bi);
 508       range_vnb = vnet_buffer (range_b);
 509       u32 bi = range_bi;
 510       if (~0 != bi)
 511         {
 512           if (bi == *bi0)
 513             *bi0 = ~0;
 514           if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 515             {
 516               u32 _bi = bi;
 517               vlib_buffer_t *_b = vlib_get_buffer (vm, _bi);
 518               while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 519                 {
 520                   if (_b->next_buffer != range_vnb->ip.reass.next_range_bi)
 521                     {
 522                       _bi = _b->next_buffer;
 523                       _b = vlib_get_buffer (vm, _bi);
 524                     }
 525                   else
 526                     {
 527                       _b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 528                       break;
 529                     }
 530                 }
 531             }
 532           range_bi = range_vnb->ip.reass.next_range_bi;
 533         }
 534     }
 535   if (*bi0 != ~0)
 536     {
 537       vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 538       vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 539       if (~0 != reass->first_bi)
 540         {
 541           fvnb->ip.reass.next_range_bi = reass->first_bi;
 542           reass->first_bi = *bi0;
 543         }
 544       else
 545         {
 546           reass->first_bi = *bi0;
 547           fvnb->ip.reass.next_range_bi = ~0;
 548         }
 549       *bi0 = ~0;
 550     }
 551 }
 552
 553 always_inline void
 554 ip4_full_reass_init (ip4_full_reass_t * reass)
 555 {
 556   reass->first_bi = ~0;
 557   reass->last_packet_octet = ~0;
 558   reass->data_len = 0;
 559   reass->next_index = ~0;
 560   reass->error_next_index = ~0;
 561 }
 562
 563 always_inline ip4_full_reass_t *
 564 ip4_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
 565                                ip4_full_reass_main_t *rm,
 566                                ip4_full_reass_per_thread_t *rt,
 567                                ip4_full_reass_kv_t *kv, u8 *do_handoff,
 568                                u32 *n_left_to_next, u32 **to_next)
 569 {
 570   ip4_full_reass_t *reass;
 571   f64 now;
 572
 573 again:
 574
 575   reass = NULL;
 576   now = vlib_time_now (vm);
 577   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 578     {
 579       if (vm->thread_index != kv->v.memory_owner_thread_index)
 580         {
 581           *do_handoff = 1;
 582           return NULL;
 583         }
 584       reass =
 585         pool_elt_at_index (rm->per_thread_data
 586                            [kv->v.memory_owner_thread_index].pool,
 587                            kv->v.reass_index);
 588
 589       if (now > reass->last_heard + rm->timeout)
 590         {
 591           vlib_node_increment_counter (vm, node->node_index,
 592                                        IP4_ERROR_REASS_TIMEOUT, 1);
 593           ip4_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next);
 594           ip4_full_reass_free (rm, rt, reass);
 595           reass = NULL;
 596         }
 597     }
 598
 599   if (reass)
 600     {
 601       reass->last_heard = now;
 602       return reass;
 603     }
 604
 605   if (rt->reass_n >= rm->max_reass_n)
 606     {
 607       reass = NULL;
 608       return reass;
 609     }
 610   else
 611     {
 612       pool_get (rt->pool, reass);
 613       clib_memset (reass, 0, sizeof (*reass));
 614       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 615       reass->memory_owner_thread_index = vm->thread_index;
 616       ++rt->id_counter;
 617       ip4_full_reass_init (reass);
 618       ++rt->reass_n;
 619     }
 620
 621   clib_memcpy_fast (&reass->key, &kv->kv.key, sizeof (reass->key));
 622   kv->v.reass_index = (reass - rt->pool);
 623   kv->v.memory_owner_thread_index = vm->thread_index;
 624   reass->last_heard = now;
 625
 626   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 627   if (rv)
 628     {
 629       ip4_full_reass_free_ctx (rt, reass);
 630       reass = NULL;
 631       // if other worker created a context already work with the other copy
 632       if (-2 == rv)
 633         goto again;
 634     }
 635
 636   return reass;
 637 }
 638
 639 always_inline ip4_full_reass_rc_t
 640 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 641                          ip4_full_reass_main_t * rm,
 642                          ip4_full_reass_per_thread_t * rt,
 643                          ip4_full_reass_t * reass, u32 * bi0,
 644                          u32 * next0, u32 * error0, bool is_custom)
 645 {
 646   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 647   vlib_buffer_t *last_b = NULL;
 648   u32 sub_chain_bi = reass->first_bi;
 649   u32 total_length = 0;
 650   u32 buf_cnt = 0;
 651   do
 652     {
 653       u32 tmp_bi = sub_chain_bi;
 654       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 655       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 656       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 657       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 658           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 659         {
 660           return IP4_REASS_RC_INTERNAL_ERROR;
 661         }
 662
 663       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 664       u32 trim_front =
 665         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 666       u32 trim_end =
 667         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 668       if (tmp_bi == reass->first_bi)
 669         {
 670           /* first buffer - keep ip4 header */
 671           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 672             {
 673               return IP4_REASS_RC_INTERNAL_ERROR;
 674             }
 675           trim_front = 0;
 676           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 677             ip4_header_bytes (ip);
 678           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 679             {
 680               return IP4_REASS_RC_INTERNAL_ERROR;
 681             }
 682         }
 683       u32 keep_data =
 684         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 685       while (1)
 686         {
 687           ++buf_cnt;
 688           if (trim_front)
 689             {
 690               if (trim_front > tmp->current_length)
 691                 {
 692                   /* drop whole buffer */
 693                   u32 to_be_freed_bi = tmp_bi;
 694                   trim_front -= tmp->current_length;
 695                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 696                     {
 697                       return IP4_REASS_RC_INTERNAL_ERROR;
 698                     }
 699                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 700                   tmp_bi = tmp->next_buffer;
 701                   tmp->next_buffer = 0;
 702                   tmp = vlib_get_buffer (vm, tmp_bi);
 703                   vlib_buffer_free_one (vm, to_be_freed_bi);
 704                   continue;
 705                 }
 706               else
 707                 {
 708                   vlib_buffer_advance (tmp, trim_front);
 709                   trim_front = 0;
 710                 }
 711             }
 712           if (keep_data)
 713             {
 714               if (last_b)
 715                 {
 716                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 717                   last_b->next_buffer = tmp_bi;
 718                 }
 719               last_b = tmp;
 720               if (keep_data <= tmp->current_length)
 721                 {
 722                   tmp->current_length = keep_data;
 723                   keep_data = 0;
 724                 }
 725               else
 726                 {
 727                   keep_data -= tmp->current_length;
 728                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 729                     {
 730                       return IP4_REASS_RC_INTERNAL_ERROR;
 731                     }
 732                 }
 733               total_length += tmp->current_length;
 734               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 735                 {
 736                   tmp_bi = tmp->next_buffer;
 737                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 738                 }
 739               else
 740                 {
 741                   break;
 742                 }
 743             }
 744           else
 745             {
 746               u32 to_be_freed_bi = tmp_bi;
 747               if (reass->first_bi == tmp_bi)
 748                 {
 749                   return IP4_REASS_RC_INTERNAL_ERROR;
 750                 }
 751               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 752                 {
 753                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 754                   tmp_bi = tmp->next_buffer;
 755                   tmp->next_buffer = 0;
 756                   tmp = vlib_get_buffer (vm, tmp_bi);
 757                   vlib_buffer_free_one (vm, to_be_freed_bi);
 758                 }
 759               else
 760                 {
 761                   tmp->next_buffer = 0;
 762                   vlib_buffer_free_one (vm, to_be_freed_bi);
 763                   break;
 764                 }
 765             }
 766         }
 767       sub_chain_bi =
 768         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 769         reass.next_range_bi;
 770     }
 771   while (~0 != sub_chain_bi);
 772
 773   if (!last_b)
 774     {
 775       return IP4_REASS_RC_INTERNAL_ERROR;
 776     }
 777   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 778
 779   if (total_length < first_b->current_length)
 780     {
 781       return IP4_REASS_RC_INTERNAL_ERROR;
 782     }
 783   total_length -= first_b->current_length;
 784   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 785   first_b->total_length_not_including_first_buffer = total_length;
 786   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 787   ip->flags_and_fragment_offset = 0;
 788   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 789   ip->checksum = ip4_header_checksum (ip);
 790   if (!vlib_buffer_chain_linearize (vm, first_b))
 791     {
 792       return IP4_REASS_RC_NO_BUF;
 793     }
 794   // reset to reconstruct the mbuf linking
 795   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 796   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 797     {
 798       ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
 799                                 ~0);
 800 #if 0
 801       // following code does a hexdump of packet fragments to stdout ...
 802       do
 803         {
 804           u32 bi = reass->first_bi;
 805           u8 *s = NULL;
 806           while (~0 != bi)
 807             {
 808               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 809               s = format (s, "%u: %U\n", bi, format_hexdump,
 810                           vlib_buffer_get_current (b), b->current_length);
 811               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 812                 {
 813                   bi = b->next_buffer;
 814                 }
 815               else
 816                 {
 817                   break;
 818                 }
 819             }
 820           printf ("%.*s\n", vec_len (s), s);
 821           fflush (stdout);
 822           vec_free (s);
 823         }
 824       while (0);
 825 #endif
 826     }
 827   *bi0 = reass->first_bi;
 828   if (!is_custom)
 829     {
 830       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 831     }
 832   else
 833     {
 834       *next0 = reass->next_index;
 835     }
 836   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 837
 838   /* Keep track of number of successfully reassembled packets and number of
 839    * fragments reassembled */
 840   vlib_node_increment_counter (vm, node->node_index, IP4_ERROR_REASS_SUCCESS,
 841                                1);
 842
 843   vlib_node_increment_counter (vm, node->node_index,
 844                                IP4_ERROR_REASS_FRAGMENTS_REASSEMBLED,
 845                                reass->fragments_n);
 846
 847   *error0 = IP4_ERROR_NONE;
 848   ip4_full_reass_free (rm, rt, reass);
 849   reass = NULL;
 850   return IP4_REASS_RC_OK;
 851 }
 852
 853 always_inline ip4_full_reass_rc_t
 854 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 855                                       ip4_full_reass_t * reass,
 856                                       u32 prev_range_bi, u32 new_next_bi)
 857 {
 858   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 859   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 860   if (~0 != prev_range_bi)
 861     {
 862       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 863       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 864       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 865       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 866     }
 867   else
 868     {
 869       if (~0 != reass->first_bi)
 870         {
 871           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 872         }
 873       reass->first_bi = new_next_bi;
 874     }
 875   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 876   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 877       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 878     {
 879       return IP4_REASS_RC_INTERNAL_ERROR;
 880     }
 881   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 882   return IP4_REASS_RC_OK;
 883 }
 884
 885 always_inline ip4_full_reass_rc_t
 886 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 887                                         vlib_node_runtime_t * node,
 888                                         ip4_full_reass_t * reass,
 889                                         u32 prev_range_bi, u32 discard_bi)
 890 {
 891   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 892   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 893   if (~0 != prev_range_bi)
 894     {
 895       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 896       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 897       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 898         {
 899           return IP4_REASS_RC_INTERNAL_ERROR;
 900         }
 901       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 902     }
 903   else
 904     {
 905       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 906     }
 907   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 908   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 909       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 910     {
 911       return IP4_REASS_RC_INTERNAL_ERROR;
 912     }
 913   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 914   while (1)
 915     {
 916       u32 to_be_freed_bi = discard_bi;
 917       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 918         {
 919           ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
 920                                     0, ~0);
 921         }
 922       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 923         {
 924           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 925           discard_bi = discard_b->next_buffer;
 926           discard_b->next_buffer = 0;
 927           discard_b = vlib_get_buffer (vm, discard_bi);
 928           vlib_buffer_free_one (vm, to_be_freed_bi);
 929         }
 930       else
 931         {
 932           discard_b->next_buffer = 0;
 933           vlib_buffer_free_one (vm, to_be_freed_bi);
 934           break;
 935         }
 936     }
 937   return IP4_REASS_RC_OK;
 938 }
 939
 940 always_inline ip4_full_reass_rc_t
 941 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 942                        ip4_full_reass_main_t * rm,
 943                        ip4_full_reass_per_thread_t * rt,
 944                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 945                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 946 {
 947   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 948   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 949   if (is_custom)
 950     {
 951       // store (error_)next_index before it's overwritten
 952       reass->next_index = fvnb->ip.reass.next_index;
 953       reass->error_next_index = fvnb->ip.reass.error_next_index;
 954     }
 955   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 956   int consumed = 0;
 957   ip4_header_t *fip = vlib_buffer_get_current (fb);
 958   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 959   const u32 fragment_length =
 960     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 961   const u32 fragment_last = fragment_first + fragment_length - 1;
 962   fvnb->ip.reass.fragment_first = fragment_first;
 963   fvnb->ip.reass.fragment_last = fragment_last;
 964   int more_fragments = ip4_get_fragment_more (fip);
 965   u32 candidate_range_bi = reass->first_bi;
 966   u32 prev_range_bi = ~0;
 967   fvnb->ip.reass.range_first = fragment_first;
 968   fvnb->ip.reass.range_last = fragment_last;
 969   fvnb->ip.reass.next_range_bi = ~0;
 970   if (!more_fragments)
 971     {
 972       reass->last_packet_octet = fragment_last;
 973     }
 974   if (~0 == reass->first_bi)
 975     {
 976       // starting a new reassembly
 977       rc =
 978         ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 979       if (IP4_REASS_RC_OK != rc)
 980         {
 981           return rc;
 982         }
 983       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 984         {
 985           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
 986         }
 987       *bi0 = ~0;
 988       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 989       reass->fragments_n = 1;
 990       return IP4_REASS_RC_OK;
 991     }
 992   reass->min_fragment_length =
 993     clib_min (clib_net_to_host_u16 (fip->length),
 994               fvnb->ip.reass.estimated_mtu);
 995   while (~0 != candidate_range_bi)
 996     {
 997       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 998       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 999       if (fragment_first > candidate_vnb->ip.reass.range_last)
1000         {
1001           // this fragments starts after candidate range
1002           prev_range_bi = candidate_range_bi;
1003           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
1004           if (candidate_vnb->ip.reass.range_last < fragment_last &&
1005               ~0 == candidate_range_bi)
1006             {
1007               // special case - this fragment falls beyond all known ranges
1008               rc = ip4_full_reass_insert_range_in_chain (vm, reass,
1009                                                          prev_range_bi, *bi0);
1010               if (IP4_REASS_RC_OK != rc)
1011                 {
1012                   return rc;
1013                 }
1014               consumed = 1;
1015               break;
1016             }
1017           continue;
1018         }
1019       if (fragment_last < candidate_vnb->ip.reass.range_first)
1020         {
1021           // this fragment ends before candidate range without any overlap
1022           rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1023                                                      *bi0);
1024           if (IP4_REASS_RC_OK != rc)
1025             {
1026               return rc;
1027             }
1028           consumed = 1;
1029         }
1030       else
1031         {
1032           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
1033               fragment_last <= candidate_vnb->ip.reass.range_last)
1034             {
1035               // this fragment is a (sub)part of existing range, ignore it
1036               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1037                 {
1038                   ip4_full_reass_add_trace (vm, node, reass, *bi0,
1039                                             RANGE_OVERLAP, 0, ~0);
1040                 }
1041               break;
1042             }
1043           int discard_candidate = 0;
1044           if (fragment_first < candidate_vnb->ip.reass.range_first)
1045             {
1046               u32 overlap =
1047                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
1048               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1049                 {
1050                   candidate_vnb->ip.reass.range_first += overlap;
1051                   if (reass->data_len < overlap)
1052                     {
1053                       return IP4_REASS_RC_INTERNAL_ERROR;
1054                     }
1055                   reass->data_len -= overlap;
1056                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1057                     {
1058                       ip4_full_reass_add_trace (vm, node, reass,
1059                                                 candidate_range_bi,
1060                                                 RANGE_SHRINK, 0, ~0);
1061                     }
1062                   rc = ip4_full_reass_insert_range_in_chain (
1063                     vm, reass, prev_range_bi, *bi0);
1064                   if (IP4_REASS_RC_OK != rc)
1065                     {
1066                       return rc;
1067                     }
1068                   consumed = 1;
1069                 }
1070               else
1071                 {
1072                   discard_candidate = 1;
1073                 }
1074             }
1075           else if (fragment_last > candidate_vnb->ip.reass.range_last)
1076             {
1077               u32 overlap =
1078                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1079               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1080                 {
1081                   fvnb->ip.reass.range_first += overlap;
1082                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1083                     {
1084                       prev_range_bi = candidate_range_bi;
1085                       candidate_range_bi =
1086                         candidate_vnb->ip.reass.next_range_bi;
1087                       continue;
1088                     }
1089                   else
1090                     {
1091                       // special case - last range discarded
1092                       rc = ip4_full_reass_insert_range_in_chain (
1093                         vm, reass, candidate_range_bi, *bi0);
1094                       if (IP4_REASS_RC_OK != rc)
1095                         {
1096                           return rc;
1097                         }
1098                       consumed = 1;
1099                     }
1100                 }
1101               else
1102                 {
1103                   discard_candidate = 1;
1104                 }
1105             }
1106           else
1107             {
1108               discard_candidate = 1;
1109             }
1110           if (discard_candidate)
1111             {
1112               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1113               // discard candidate range, probe next range
1114               rc = ip4_full_reass_remove_range_from_chain (
1115                 vm, node, reass, prev_range_bi, candidate_range_bi);
1116               if (IP4_REASS_RC_OK != rc)
1117                 {
1118                   return rc;
1119                 }
1120               if (~0 != next_range_bi)
1121                 {
1122                   candidate_range_bi = next_range_bi;
1123                   continue;
1124                 }
1125               else
1126                 {
1127                   // special case - last range discarded
1128                   rc = ip4_full_reass_insert_range_in_chain (
1129                     vm, reass, prev_range_bi, *bi0);
1130                   if (IP4_REASS_RC_OK != rc)
1131                     {
1132                       return rc;
1133                     }
1134                   consumed = 1;
1135                 }
1136             }
1137         }
1138       break;
1139     }
1140   ++reass->fragments_n;
1141   if (consumed)
1142     {
1143       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1144         {
1145           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1146         }
1147     }
1148   if (~0 != reass->last_packet_octet &&
1149       reass->data_len == reass->last_packet_octet + 1)
1150     {
1151       *handoff_thread_idx = reass->sendout_thread_index;
1152       int handoff =
1153         reass->memory_owner_thread_index != reass->sendout_thread_index;
1154       rc =
1155         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1156                                  is_custom);
1157       if (IP4_REASS_RC_OK == rc && handoff)
1158         {
1159           rc = IP4_REASS_RC_HANDOFF;
1160         }
1161     }
1162   else
1163     {
1164       if (consumed)
1165         {
1166           *bi0 = ~0;
1167           if (reass->fragments_n > rm->max_reass_len)
1168             {
1169               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1170             }
1171         }
1172       else
1173         {
1174           *next0 = IP4_FULL_REASS_NEXT_DROP;
1175           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1176         }
1177     }
1178   return rc;
1179 }
1180
1181 always_inline uword
1182 ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1183                        vlib_frame_t *frame, ip4_full_reass_node_type_t type,
1184                        bool is_local)
1185 {
1186   u32 *from = vlib_frame_vector_args (frame);
1187   u32 n_left_from, n_left_to_next, *to_next, next_index;
1188   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1189   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1190   clib_spinlock_lock (&rt->lock);
1191
1192   n_left_from = frame->n_vectors;
1193   next_index = node->cached_next_index;
1194   while (n_left_from > 0)
1195     {
1196       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1197
1198       while (n_left_from > 0 && n_left_to_next > 0)
1199         {
1200           u32 bi0;
1201           vlib_buffer_t *b0;
1202           u32 next0;
1203           u32 error0 = IP4_ERROR_NONE;
1204
1205           bi0 = from[0];
1206           b0 = vlib_get_buffer (vm, bi0);
1207
1208           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1209           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1210             {
1211               // this is a whole packet - no fragmentation
1212               if (CUSTOM != type)
1213                 {
1214                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1215                 }
1216               else
1217                 {
1218                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1219                 }
1220               ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
1221                                         ~0);
1222               goto packet_enqueue;
1223             }
1224
1225           if (is_local && !rm->is_local_reass_enabled)
1226             {
1227               next0 = IP4_FULL_REASS_NEXT_DROP;
1228               goto packet_enqueue;
1229             }
1230
1231           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1232           const u32 fragment_length =
1233             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1234           const u32 fragment_last = fragment_first + fragment_length - 1;
1235
1236           /* Keep track of received fragments */
1237           vlib_node_increment_counter (vm, node->node_index,
1238                                        IP4_ERROR_REASS_FRAGMENTS_RCVD, 1);
1239
1240           if (fragment_first > fragment_last ||
1241               fragment_first + fragment_length > UINT16_MAX - 20 ||
1242               (fragment_length < 8 && // 8 is minimum frag length per RFC 791
1243                ip4_get_fragment_more (ip0)))
1244             {
1245               next0 = IP4_FULL_REASS_NEXT_DROP;
1246               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1247               goto packet_enqueue;
1248             }
1249
1250           u32 fib_index = vec_elt (ip4_main.fib_index_by_sw_if_index,
1251                                    vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1252
1253           ip4_full_reass_kv_t kv = { .k.fib_index = fib_index,
1254                                      .k.src.as_u32 = ip0->src_address.as_u32,
1255                                      .k.dst.as_u32 = ip0->dst_address.as_u32,
1256                                      .k.frag_id = ip0->fragment_id,
1257                                      .k.proto = ip0->protocol
1258
1259           };
1260           u8 do_handoff = 0;
1261
1262           ip4_full_reass_t *reass = ip4_full_reass_find_or_create (
1263             vm, node, rm, rt, &kv, &do_handoff, &n_left_to_next, &to_next);
1264
1265           if (reass)
1266             {
1267               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1268               if (0 == fragment_first)
1269                 {
1270                   reass->sendout_thread_index = vm->thread_index;
1271                 }
1272             }
1273
1274           if (PREDICT_FALSE (do_handoff))
1275             {
1276               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1277               vnet_buffer (b0)->ip.reass.owner_thread_index =
1278                 kv.v.memory_owner_thread_index;
1279             }
1280           else if (reass)
1281             {
1282               u32 handoff_thread_idx;
1283               u32 counter = ~0;
1284               switch (ip4_full_reass_update
1285                       (vm, node, rm, rt, reass, &bi0, &next0,
1286                        &error0, CUSTOM == type, &handoff_thread_idx))
1287                 {
1288                 case IP4_REASS_RC_OK:
1289                   /* nothing to do here */
1290                   break;
1291                 case IP4_REASS_RC_HANDOFF:
1292                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1293                   b0 = vlib_get_buffer (vm, bi0);
1294                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1295                     handoff_thread_idx;
1296                   break;
1297                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1298                   counter = IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1299                   break;
1300                 case IP4_REASS_RC_NO_BUF:
1301                   counter = IP4_ERROR_REASS_NO_BUF;
1302                   break;
1303                 case IP4_REASS_RC_INTERNAL_ERROR:
1304                   counter = IP4_ERROR_REASS_INTERNAL_ERROR;
1305                   /* Sanitization is needed in internal error cases only, as
1306                    * the incoming packet is already dropped in other cases,
1307                    * also adding bi0 back to the reassembly list, fixes the
1308                    * leaking of buffers during internal errors.
1309                    *
1310                    * Also it doesnt make sense to send these buffers custom
1311                    * app, these fragments are with internal errors */
1312                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1313                   reass->error_next_index = ~0;
1314                   break;
1315                 }
1316
1317               if (~0 != counter)
1318                 {
1319                   vlib_node_increment_counter (vm, node->node_index, counter,
1320                                                1);
1321                   ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1322                                            &to_next);
1323                   ip4_full_reass_free (rm, rt, reass);
1324                   goto next_packet;
1325                 }
1326             }
1327           else
1328             {
1329               next0 = IP4_FULL_REASS_NEXT_DROP;
1330               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1331             }
1332
1333
1334         packet_enqueue:
1335
1336           if (bi0 != ~0)
1337             {
1338               to_next[0] = bi0;
1339               to_next += 1;
1340               n_left_to_next -= 1;
1341
1342               /* bi0 might have been updated by reass_finalize, reload */
1343               b0 = vlib_get_buffer (vm, bi0);
1344               if (IP4_ERROR_NONE != error0)
1345                 {
1346                   b0->error = node->errors[error0];
1347                 }
1348
1349               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1350                 {
1351                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1352                     {
1353                       ip4_full_reass_add_trace (
1354                         vm, node, NULL, bi0, HANDOFF, 0,
1355                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1356                     }
1357                 }
1358               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1359                 {
1360                   vnet_feature_next (&next0, b0);
1361                 }
1362
1363               /* Increment the counter to-custom-app also as this fragment is
1364                * also going to application */
1365               if (CUSTOM == type)
1366                 {
1367                   vlib_node_increment_counter (
1368                     vm, node->node_index, IP4_ERROR_REASS_TO_CUSTOM_APP, 1);
1369                 }
1370
1371               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1372                                                to_next, n_left_to_next,
1373                                                bi0, next0);
1374               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1375             }
1376
1377         next_packet:
1378           from += 1;
1379           n_left_from -= 1;
1380         }
1381
1382       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1383     }
1384
1385   clib_spinlock_unlock (&rt->lock);
1386   return frame->n_vectors;
1387 }
1388
1389 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1390                                     vlib_node_runtime_t * node,
1391                                     vlib_frame_t * frame)
1392 {
1393   return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
1394 }
1395
1396 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1397     .name = "ip4-full-reassembly",
1398     .vector_size = sizeof (u32),
1399     .format_trace = format_ip4_full_reass_trace,
1400     .n_errors = IP4_N_ERROR,
1401     .error_counters = ip4_error_counters,
1402     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1403     .next_nodes =
1404         {
1405                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1406                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1407                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1408
1409         },
1410 };
1411
1412 VLIB_NODE_FN (ip4_local_full_reass_node)
1413 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1414 {
1415   return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
1416 }
1417
1418 VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
1419     .name = "ip4-local-full-reassembly",
1420     .vector_size = sizeof (u32),
1421     .format_trace = format_ip4_full_reass_trace,
1422     .n_errors = IP4_N_ERROR,
1423     .error_counters = ip4_error_counters,
1424     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1425     .next_nodes =
1426         {
1427                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1428                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1429                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
1430
1431         },
1432 };
1433
1434 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1435                                             vlib_node_runtime_t * node,
1436                                             vlib_frame_t * frame)
1437 {
1438   return ip4_full_reass_inline (vm, node, frame, FEATURE,
1439                                 false /* is_local */);
1440 }
1441
1442 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1443     .name = "ip4-full-reassembly-feature",
1444     .vector_size = sizeof (u32),
1445     .format_trace = format_ip4_full_reass_trace,
1446     .n_errors = IP4_N_ERROR,
1447     .error_counters = ip4_error_counters,
1448     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1449     .next_nodes =
1450         {
1451                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1452                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1453                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1454         },
1455 };
1456
1457 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1458     .arc_name = "ip4-unicast",
1459     .node_name = "ip4-full-reassembly-feature",
1460     .runs_before = VNET_FEATURES ("ip4-lookup",
1461                                   "ipsec4-input-feature"),
1462     .runs_after = 0,
1463 };
1464
1465 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1466                                            vlib_node_runtime_t * node,
1467                                            vlib_frame_t * frame)
1468 {
1469   return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
1470 }
1471
1472 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1473     .name = "ip4-full-reassembly-custom",
1474     .vector_size = sizeof (u32),
1475     .format_trace = format_ip4_full_reass_trace,
1476     .n_errors = IP4_N_ERROR,
1477     .error_counters = ip4_error_counters,
1478     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1479     .next_nodes =
1480         {
1481                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1482                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1483                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1484         },
1485 };
1486
1487 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1488     .arc_name = "ip4-unicast",
1489     .node_name = "ip4-full-reassembly-feature",
1490     .runs_before = VNET_FEATURES ("ip4-lookup",
1491                                   "ipsec4-input-feature"),
1492     .runs_after = 0,
1493 };
1494
1495
1496 #ifndef CLIB_MARCH_VARIANT
1497 uword
1498 ip4_full_reass_custom_register_next_node (uword node_index)
1499 {
1500   return vlib_node_add_next (vlib_get_main (),
1501                              ip4_full_reass_node_custom.index, node_index);
1502 }
1503
1504 always_inline u32
1505 ip4_full_reass_get_nbuckets ()
1506 {
1507   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1508   u32 nbuckets;
1509   u8 i;
1510
1511   /* need more mem with more workers */
1512   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1513                     IP4_REASS_HT_LOAD_FACTOR);
1514
1515   for (i = 0; i < 31; i++)
1516     if ((1 << i) >= nbuckets)
1517       break;
1518   nbuckets = 1 << i;
1519
1520   return nbuckets;
1521 }
1522 #endif /* CLIB_MARCH_VARIANT */
1523
1524 typedef enum
1525 {
1526   IP4_EVENT_CONFIG_CHANGED = 1,
1527 } ip4_full_reass_event_t;
1528
1529 typedef struct
1530 {
1531   int failure;
1532   clib_bihash_16_8_t *new_hash;
1533 } ip4_rehash_cb_ctx;
1534
1535 #ifndef CLIB_MARCH_VARIANT
1536 static int
1537 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1538 {
1539   ip4_rehash_cb_ctx *ctx = _ctx;
1540   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1541     {
1542       ctx->failure = 1;
1543     }
1544   return (BIHASH_WALK_CONTINUE);
1545 }
1546
1547 static void
1548 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1549                            u32 max_reassembly_length,
1550                            u32 expire_walk_interval_ms)
1551 {
1552   ip4_full_reass_main.timeout_ms = timeout_ms;
1553   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1554   ip4_full_reass_main.max_reass_n = max_reassemblies;
1555   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1556   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1557 }
1558
1559 vnet_api_error_t
1560 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1561                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1562 {
1563   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1564   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1565                              max_reassembly_length, expire_walk_interval_ms);
1566   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1567                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1568                              IP4_EVENT_CONFIG_CHANGED, 0);
1569   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1570   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1571     {
1572       clib_bihash_16_8_t new_hash;
1573       clib_memset (&new_hash, 0, sizeof (new_hash));
1574       ip4_rehash_cb_ctx ctx;
1575       ctx.failure = 0;
1576       ctx.new_hash = &new_hash;
1577       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1578                              new_nbuckets * 1024);
1579       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1580                                                ip4_rehash_cb, &ctx);
1581       if (ctx.failure)
1582         {
1583           clib_bihash_free_16_8 (&new_hash);
1584           return -1;
1585         }
1586       else
1587         {
1588           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1589           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1590                             sizeof (ip4_full_reass_main.hash));
1591           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1592         }
1593     }
1594   return 0;
1595 }
1596
1597 vnet_api_error_t
1598 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1599                     u32 * max_reassembly_length,
1600                     u32 * expire_walk_interval_ms)
1601 {
1602   *timeout_ms = ip4_full_reass_main.timeout_ms;
1603   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1604   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1605   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1606   return 0;
1607 }
1608
1609 static clib_error_t *
1610 ip4_full_reass_init_function (vlib_main_t * vm)
1611 {
1612   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1613   clib_error_t *error = 0;
1614   u32 nbuckets;
1615   vlib_node_t *node;
1616
1617   rm->vlib_main = vm;
1618
1619   vec_validate (rm->per_thread_data, vlib_num_workers ());
1620   ip4_full_reass_per_thread_t *rt;
1621   vec_foreach (rt, rm->per_thread_data)
1622   {
1623     clib_spinlock_init (&rt->lock);
1624     pool_alloc (rt->pool, rm->max_reass_n);
1625   }
1626
1627   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1628   ASSERT (node);
1629   rm->ip4_full_reass_expire_node_idx = node->index;
1630
1631   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1632                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1633                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1634                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1635
1636   nbuckets = ip4_full_reass_get_nbuckets ();
1637   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1638
1639   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1640   rm->fq_local_index =
1641     vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
1642   rm->fq_feature_index =
1643     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1644   rm->fq_custom_index =
1645     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1646
1647   rm->feature_use_refcount_per_intf = NULL;
1648   rm->is_local_reass_enabled = 1;
1649
1650   return error;
1651 }
1652
1653 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1654 #endif /* CLIB_MARCH_VARIANT */
1655
1656 static uword
1657 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1658                              CLIB_UNUSED (vlib_frame_t *f))
1659 {
1660   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1661   uword event_type, *event_data = 0;
1662
1663   while (true)
1664     {
1665       vlib_process_wait_for_event_or_clock (vm,
1666                                             (f64)
1667                                             rm->expire_walk_interval_ms /
1668                                             (f64) MSEC_PER_SEC);
1669       event_type = vlib_process_get_events (vm, &event_data);
1670
1671       switch (event_type)
1672         {
1673         case ~0:
1674           /* no events => timeout */
1675           /* fallthrough */
1676         case IP4_EVENT_CONFIG_CHANGED:
1677           /* nothing to do here */
1678           break;
1679         default:
1680           clib_warning ("BUG: event type 0x%wx", event_type);
1681           break;
1682         }
1683       f64 now = vlib_time_now (vm);
1684
1685       ip4_full_reass_t *reass;
1686       int *pool_indexes_to_free = NULL;
1687
1688       uword thread_index = 0;
1689       int index;
1690       const uword nthreads = vlib_num_workers () + 1;
1691       u32 n_left_to_next, *to_next;
1692
1693       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1694         {
1695           ip4_full_reass_per_thread_t *rt =
1696             &rm->per_thread_data[thread_index];
1697           clib_spinlock_lock (&rt->lock);
1698
1699           vec_reset_length (pool_indexes_to_free);
1700
1701           /* Pace the number of timeouts handled per thread,to avoid barrier
1702            * sync issues in real world scenarios */
1703
1704           u32 beg = rt->last_id;
1705           /* to ensure we walk at least once per sec per context */
1706           u32 end =
1707             beg + (IP4_REASS_MAX_REASSEMBLIES_DEFAULT *
1708                      IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS / MSEC_PER_SEC +
1709                    1);
1710           if (end > vec_len (rt->pool))
1711             {
1712               end = vec_len (rt->pool);
1713               rt->last_id = 0;
1714             }
1715           else
1716             {
1717               rt->last_id = end;
1718             }
1719
1720           pool_foreach_stepping_index (index, beg, end, rt->pool)
1721           {
1722             reass = pool_elt_at_index (rt->pool, index);
1723             if (now > reass->last_heard + rm->timeout)
1724               {
1725                 vec_add1 (pool_indexes_to_free, index);
1726               }
1727           }
1728
1729           if (vec_len (pool_indexes_to_free))
1730             vlib_node_increment_counter (vm, node->node_index,
1731                                          IP4_ERROR_REASS_TIMEOUT,
1732                                          vec_len (pool_indexes_to_free));
1733           int *i;
1734           vec_foreach (i, pool_indexes_to_free)
1735           {
1736             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1737             ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1738                                      &to_next);
1739             ip4_full_reass_free (rm, rt, reass);
1740           }
1741
1742           clib_spinlock_unlock (&rt->lock);
1743         }
1744
1745       vec_free (pool_indexes_to_free);
1746       if (event_data)
1747         {
1748           vec_set_len (event_data, 0);
1749         }
1750     }
1751
1752   return 0;
1753 }
1754
1755 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1756   .function = ip4_full_reass_walk_expired,
1757   .type = VLIB_NODE_TYPE_PROCESS,
1758   .name = "ip4-full-reassembly-expire-walk",
1759   .format_trace = format_ip4_full_reass_trace,
1760   .n_errors = IP4_N_ERROR,
1761   .error_counters = ip4_error_counters,
1762 };
1763
1764 static u8 *
1765 format_ip4_full_reass_key (u8 * s, va_list * args)
1766 {
1767   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1768   s =
1769     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1770             key->fib_index, format_ip4_address, &key->src, format_ip4_address,
1771             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1772   return s;
1773 }
1774
1775 static u8 *
1776 format_ip4_reass (u8 * s, va_list * args)
1777 {
1778   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1779   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1780
1781   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1782               "last_packet_octet: %u, trace_op_counter: %u\n",
1783               reass->id, format_ip4_full_reass_key, &reass->key,
1784               reass->first_bi, reass->data_len,
1785               reass->last_packet_octet, reass->trace_op_counter);
1786
1787   u32 bi = reass->first_bi;
1788   u32 counter = 0;
1789   while (~0 != bi)
1790     {
1791       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1792       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1793       s =
1794         format (s,
1795                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1796                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1797                 vnb->ip.reass.range_last, bi,
1798                 ip4_full_reass_buffer_get_data_offset (b),
1799                 ip4_full_reass_buffer_get_data_len (b),
1800                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1801       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1802         {
1803           bi = b->next_buffer;
1804         }
1805       else
1806         {
1807           bi = ~0;
1808         }
1809     }
1810   return s;
1811 }
1812
1813 static clib_error_t *
1814 show_ip4_reass (vlib_main_t * vm,
1815                 unformat_input_t * input,
1816                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1817 {
1818   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1819
1820   vlib_cli_output (vm, "---------------------");
1821   vlib_cli_output (vm, "IP4 reassembly status");
1822   vlib_cli_output (vm, "---------------------");
1823   bool details = false;
1824   if (unformat (input, "details"))
1825     {
1826       details = true;
1827     }
1828
1829   u32 sum_reass_n = 0;
1830   ip4_full_reass_t *reass;
1831   uword thread_index;
1832   const uword nthreads = vlib_num_workers () + 1;
1833   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1834     {
1835       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1836       clib_spinlock_lock (&rt->lock);
1837       if (details)
1838         {
1839           pool_foreach (reass, rt->pool) {
1840             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1841           }
1842         }
1843       sum_reass_n += rt->reass_n;
1844       clib_spinlock_unlock (&rt->lock);
1845     }
1846   vlib_cli_output (vm, "---------------------");
1847   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1848                    (long unsigned) sum_reass_n);
1849   vlib_cli_output (vm,
1850                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1851                    (long unsigned) rm->max_reass_n);
1852   vlib_cli_output (vm,
1853                    "Maximum configured amount of fragments "
1854                    "per full IP4 reassembly: %lu\n",
1855                    (long unsigned) rm->max_reass_len);
1856   vlib_cli_output (vm,
1857                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1858                    (long unsigned) rm->timeout_ms);
1859   vlib_cli_output (vm,
1860                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1861                    (long unsigned) rm->expire_walk_interval_ms);
1862   return 0;
1863 }
1864
1865 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1866     .path = "show ip4-full-reassembly",
1867     .short_help = "show ip4-full-reassembly [details]",
1868     .function = show_ip4_reass,
1869 };
1870
1871 #ifndef CLIB_MARCH_VARIANT
1872 vnet_api_error_t
1873 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1874 {
1875   return vnet_feature_enable_disable ("ip4-unicast",
1876                                       "ip4-full-reassembly-feature",
1877                                       sw_if_index, enable_disable, 0, 0);
1878 }
1879 #endif /* CLIB_MARCH_VARIANT */
1880
1881
1882 #define foreach_ip4_full_reass_handoff_error                       \
1883 _(CONGESTION_DROP, "congestion drop")
1884
1885
1886 typedef enum
1887 {
1888 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1889   foreach_ip4_full_reass_handoff_error
1890 #undef _
1891     IP4_FULL_REASS_HANDOFF_N_ERROR,
1892 } ip4_full_reass_handoff_error_t;
1893
1894 static char *ip4_full_reass_handoff_error_strings[] = {
1895 #define _(sym,string) string,
1896   foreach_ip4_full_reass_handoff_error
1897 #undef _
1898 };
1899
1900 typedef struct
1901 {
1902   u32 next_worker_index;
1903 } ip4_full_reass_handoff_trace_t;
1904
1905 static u8 *
1906 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1907 {
1908   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1909   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1910   ip4_full_reass_handoff_trace_t *t =
1911     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1912
1913   s =
1914     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1915             t->next_worker_index);
1916
1917   return s;
1918 }
1919
1920 always_inline uword
1921 ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1922                                     vlib_frame_t *frame,
1923                                     ip4_full_reass_node_type_t type,
1924                                     bool is_local)
1925 {
1926   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1927
1928   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1929   u32 n_enq, n_left_from, *from;
1930   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1931   u32 fq_index;
1932
1933   from = vlib_frame_vector_args (frame);
1934   n_left_from = frame->n_vectors;
1935   vlib_get_buffers (vm, from, bufs, n_left_from);
1936
1937   b = bufs;
1938   ti = thread_indices;
1939
1940   switch (type)
1941     {
1942     case NORMAL:
1943       if (is_local)
1944         {
1945           fq_index = rm->fq_local_index;
1946         }
1947       else
1948         {
1949           fq_index = rm->fq_index;
1950         }
1951       break;
1952     case FEATURE:
1953       fq_index = rm->fq_feature_index;
1954       break;
1955     case CUSTOM:
1956       fq_index = rm->fq_custom_index;
1957       break;
1958     default:
1959       clib_warning ("Unexpected `type' (%d)!", type);
1960     }
1961
1962   while (n_left_from > 0)
1963     {
1964       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1965
1966       if (PREDICT_FALSE
1967           ((node->flags & VLIB_NODE_FLAG_TRACE)
1968            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1969         {
1970           ip4_full_reass_handoff_trace_t *t =
1971             vlib_add_trace (vm, node, b[0], sizeof (*t));
1972           t->next_worker_index = ti[0];
1973         }
1974
1975       n_left_from -= 1;
1976       ti += 1;
1977       b += 1;
1978     }
1979   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1980                                          thread_indices, frame->n_vectors, 1);
1981
1982   if (n_enq < frame->n_vectors)
1983     vlib_node_increment_counter (vm, node->node_index,
1984                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1985                                  frame->n_vectors - n_enq);
1986   return frame->n_vectors;
1987 }
1988
1989 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1990                                             vlib_node_runtime_t * node,
1991                                             vlib_frame_t * frame)
1992 {
1993   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1994                                              false /* is_local */);
1995 }
1996
1997
1998 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1999   .name = "ip4-full-reassembly-handoff",
2000   .vector_size = sizeof (u32),
2001   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2002   .error_strings = ip4_full_reass_handoff_error_strings,
2003   .format_trace = format_ip4_full_reass_handoff_trace,
2004
2005   .n_next_nodes = 1,
2006
2007   .next_nodes = {
2008     [0] = "error-drop",
2009   },
2010 };
2011
2012 VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
2013 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2014 {
2015   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
2016                                              true /* is_local */);
2017 }
2018
2019 VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
2020   .name = "ip4-local-full-reassembly-handoff",
2021   .vector_size = sizeof (u32),
2022   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2023   .error_strings = ip4_full_reass_handoff_error_strings,
2024   .format_trace = format_ip4_full_reass_handoff_trace,
2025
2026   .n_next_nodes = 1,
2027
2028   .next_nodes = {
2029     [0] = "error-drop",
2030   },
2031 };
2032
2033 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
2034                                                     vlib_node_runtime_t *
2035                                                     node,
2036                                                     vlib_frame_t * frame)
2037 {
2038   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
2039                                              false /* is_local */);
2040 }
2041
2042 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
2043   .name = "ip4-full-reass-feature-hoff",
2044   .vector_size = sizeof (u32),
2045   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2046   .error_strings = ip4_full_reass_handoff_error_strings,
2047   .format_trace = format_ip4_full_reass_handoff_trace,
2048
2049   .n_next_nodes = 1,
2050
2051   .next_nodes = {
2052     [0] = "error-drop",
2053   },
2054 };
2055
2056 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
2057                                                     vlib_node_runtime_t *
2058                                                     node,
2059                                                     vlib_frame_t * frame)
2060 {
2061   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
2062                                              false /* is_local */);
2063 }
2064
2065 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
2066   .name = "ip4-full-reass-custom-hoff",
2067   .vector_size = sizeof (u32),
2068   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2069   .error_strings = ip4_full_reass_handoff_error_strings,
2070   .format_trace = format_ip4_full_reass_handoff_trace,
2071
2072   .n_next_nodes = 1,
2073
2074   .next_nodes = {
2075     [0] = "error-drop",
2076   },
2077 };
2078
2079 #ifndef CLIB_MARCH_VARIANT
2080 int
2081 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2082 {
2083   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
2084   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2085   if (is_enable)
2086     {
2087       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2088         {
2089           ++rm->feature_use_refcount_per_intf[sw_if_index];
2090           return vnet_feature_enable_disable ("ip4-unicast",
2091                                               "ip4-full-reassembly-feature",
2092                                               sw_if_index, 1, 0, 0);
2093         }
2094       ++rm->feature_use_refcount_per_intf[sw_if_index];
2095     }
2096   else
2097     {
2098       --rm->feature_use_refcount_per_intf[sw_if_index];
2099       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2100         return vnet_feature_enable_disable ("ip4-unicast",
2101                                             "ip4-full-reassembly-feature",
2102                                             sw_if_index, 0, 0, 0);
2103     }
2104   return -1;
2105 }
2106
2107 void
2108 ip4_local_full_reass_enable_disable (int enable)
2109 {
2110   if (enable)
2111     {
2112       ip4_full_reass_main.is_local_reass_enabled = 1;
2113     }
2114   else
2115     {
2116       ip4_full_reass_main.is_local_reass_enabled = 0;
2117     }
2118 }
2119
2120 int
2121 ip4_local_full_reass_enabled ()
2122 {
2123   return ip4_full_reass_main.is_local_reass_enabled;
2124 }
2125
2126 #endif
2127
2128 /*
2129  * fd.io coding-style-patch-verification: ON
2130  *
2131  * Local Variables:
2132  * eval: (c-set-style "gnu")
2133  * End:
2134  */