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   do
 651     {
 652       u32 tmp_bi = sub_chain_bi;
 653       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 654       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 655       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 656       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 657           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 658         {
 659           return IP4_REASS_RC_INTERNAL_ERROR;
 660         }
 661
 662       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 663       u32 trim_front =
 664         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 665       u32 trim_end =
 666         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 667       if (tmp_bi == reass->first_bi)
 668         {
 669           /* first buffer - keep ip4 header */
 670           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 671             {
 672               return IP4_REASS_RC_INTERNAL_ERROR;
 673             }
 674           trim_front = 0;
 675           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 676             ip4_header_bytes (ip);
 677           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 678             {
 679               return IP4_REASS_RC_INTERNAL_ERROR;
 680             }
 681         }
 682       u32 keep_data =
 683         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 684       while (1)
 685         {
 686           if (trim_front)
 687             {
 688               if (trim_front > tmp->current_length)
 689                 {
 690                   /* drop whole buffer */
 691                   u32 to_be_freed_bi = tmp_bi;
 692                   trim_front -= tmp->current_length;
 693                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 694                     {
 695                       return IP4_REASS_RC_INTERNAL_ERROR;
 696                     }
 697                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 698                   tmp_bi = tmp->next_buffer;
 699                   tmp->next_buffer = 0;
 700                   tmp = vlib_get_buffer (vm, tmp_bi);
 701                   vlib_buffer_free_one (vm, to_be_freed_bi);
 702                   continue;
 703                 }
 704               else
 705                 {
 706                   vlib_buffer_advance (tmp, trim_front);
 707                   trim_front = 0;
 708                 }
 709             }
 710           if (keep_data)
 711             {
 712               if (last_b)
 713                 {
 714                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 715                   last_b->next_buffer = tmp_bi;
 716                 }
 717               last_b = tmp;
 718               if (keep_data <= tmp->current_length)
 719                 {
 720                   tmp->current_length = keep_data;
 721                   keep_data = 0;
 722                 }
 723               else
 724                 {
 725                   keep_data -= tmp->current_length;
 726                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 727                     {
 728                       return IP4_REASS_RC_INTERNAL_ERROR;
 729                     }
 730                 }
 731               total_length += tmp->current_length;
 732               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 733                 {
 734                   tmp_bi = tmp->next_buffer;
 735                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 736                 }
 737               else
 738                 {
 739                   break;
 740                 }
 741             }
 742           else
 743             {
 744               u32 to_be_freed_bi = tmp_bi;
 745               if (reass->first_bi == tmp_bi)
 746                 {
 747                   return IP4_REASS_RC_INTERNAL_ERROR;
 748                 }
 749               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 750                 {
 751                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 752                   tmp_bi = tmp->next_buffer;
 753                   tmp->next_buffer = 0;
 754                   tmp = vlib_get_buffer (vm, tmp_bi);
 755                   vlib_buffer_free_one (vm, to_be_freed_bi);
 756                 }
 757               else
 758                 {
 759                   tmp->next_buffer = 0;
 760                   vlib_buffer_free_one (vm, to_be_freed_bi);
 761                   break;
 762                 }
 763             }
 764         }
 765       sub_chain_bi =
 766         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 767         reass.next_range_bi;
 768     }
 769   while (~0 != sub_chain_bi);
 770
 771   if (!last_b)
 772     {
 773       return IP4_REASS_RC_INTERNAL_ERROR;
 774     }
 775   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 776
 777   if (total_length < first_b->current_length)
 778     {
 779       return IP4_REASS_RC_INTERNAL_ERROR;
 780     }
 781   total_length -= first_b->current_length;
 782   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 783   first_b->total_length_not_including_first_buffer = total_length;
 784   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 785   ip->flags_and_fragment_offset = 0;
 786   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 787   ip->checksum = ip4_header_checksum (ip);
 788   if (!vlib_buffer_chain_linearize (vm, first_b))
 789     {
 790       return IP4_REASS_RC_NO_BUF;
 791     }
 792   // reset to reconstruct the mbuf linking
 793   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 794   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 795     {
 796       ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
 797                                 ~0);
 798 #if 0
 799       // following code does a hexdump of packet fragments to stdout ...
 800       do
 801         {
 802           u32 bi = reass->first_bi;
 803           u8 *s = NULL;
 804           while (~0 != bi)
 805             {
 806               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 807               s = format (s, "%u: %U\n", bi, format_hexdump,
 808                           vlib_buffer_get_current (b), b->current_length);
 809               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 810                 {
 811                   bi = b->next_buffer;
 812                 }
 813               else
 814                 {
 815                   break;
 816                 }
 817             }
 818           printf ("%.*s\n", vec_len (s), s);
 819           fflush (stdout);
 820           vec_free (s);
 821         }
 822       while (0);
 823 #endif
 824     }
 825   *bi0 = reass->first_bi;
 826   if (!is_custom)
 827     {
 828       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 829     }
 830   else
 831     {
 832       *next0 = reass->next_index;
 833     }
 834   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 835
 836   /* Keep track of number of successfully reassembled packets and number of
 837    * fragments reassembled */
 838   vlib_node_increment_counter (vm, node->node_index, IP4_ERROR_REASS_SUCCESS,
 839                                1);
 840
 841   vlib_node_increment_counter (vm, node->node_index,
 842                                IP4_ERROR_REASS_FRAGMENTS_REASSEMBLED,
 843                                reass->fragments_n);
 844
 845   *error0 = IP4_ERROR_NONE;
 846   ip4_full_reass_free (rm, rt, reass);
 847   reass = NULL;
 848   return IP4_REASS_RC_OK;
 849 }
 850
 851 always_inline ip4_full_reass_rc_t
 852 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 853                                       ip4_full_reass_t * reass,
 854                                       u32 prev_range_bi, u32 new_next_bi)
 855 {
 856   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 857   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 858   if (~0 != prev_range_bi)
 859     {
 860       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 861       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 862       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 863       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 864     }
 865   else
 866     {
 867       if (~0 != reass->first_bi)
 868         {
 869           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 870         }
 871       reass->first_bi = new_next_bi;
 872     }
 873   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 874   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 875       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 876     {
 877       return IP4_REASS_RC_INTERNAL_ERROR;
 878     }
 879   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 880   return IP4_REASS_RC_OK;
 881 }
 882
 883 always_inline ip4_full_reass_rc_t
 884 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 885                                         vlib_node_runtime_t * node,
 886                                         ip4_full_reass_t * reass,
 887                                         u32 prev_range_bi, u32 discard_bi)
 888 {
 889   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 890   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 891   if (~0 != prev_range_bi)
 892     {
 893       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 894       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 895       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 896         {
 897           return IP4_REASS_RC_INTERNAL_ERROR;
 898         }
 899       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 900     }
 901   else
 902     {
 903       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 904     }
 905   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 906   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 907       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 908     {
 909       return IP4_REASS_RC_INTERNAL_ERROR;
 910     }
 911   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 912   while (1)
 913     {
 914       u32 to_be_freed_bi = discard_bi;
 915       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 916         {
 917           ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
 918                                     0, ~0);
 919         }
 920       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 921         {
 922           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 923           discard_bi = discard_b->next_buffer;
 924           discard_b->next_buffer = 0;
 925           discard_b = vlib_get_buffer (vm, discard_bi);
 926           vlib_buffer_free_one (vm, to_be_freed_bi);
 927         }
 928       else
 929         {
 930           discard_b->next_buffer = 0;
 931           vlib_buffer_free_one (vm, to_be_freed_bi);
 932           break;
 933         }
 934     }
 935   return IP4_REASS_RC_OK;
 936 }
 937
 938 always_inline ip4_full_reass_rc_t
 939 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 940                        ip4_full_reass_main_t * rm,
 941                        ip4_full_reass_per_thread_t * rt,
 942                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 943                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 944 {
 945   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 946   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 947   if (is_custom)
 948     {
 949       // store (error_)next_index before it's overwritten
 950       reass->next_index = fvnb->ip.reass.next_index;
 951       reass->error_next_index = fvnb->ip.reass.error_next_index;
 952     }
 953   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 954   int consumed = 0;
 955   ip4_header_t *fip = vlib_buffer_get_current (fb);
 956   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 957   const u32 fragment_length =
 958     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 959   const u32 fragment_last = fragment_first + fragment_length - 1;
 960   fvnb->ip.reass.fragment_first = fragment_first;
 961   fvnb->ip.reass.fragment_last = fragment_last;
 962   int more_fragments = ip4_get_fragment_more (fip);
 963   u32 candidate_range_bi = reass->first_bi;
 964   u32 prev_range_bi = ~0;
 965   fvnb->ip.reass.range_first = fragment_first;
 966   fvnb->ip.reass.range_last = fragment_last;
 967   fvnb->ip.reass.next_range_bi = ~0;
 968   if (!more_fragments)
 969     {
 970       reass->last_packet_octet = fragment_last;
 971     }
 972   if (~0 == reass->first_bi)
 973     {
 974       // starting a new reassembly
 975       rc =
 976         ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 977       if (IP4_REASS_RC_OK != rc)
 978         {
 979           return rc;
 980         }
 981       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 982         {
 983           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
 984         }
 985       *bi0 = ~0;
 986       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 987       reass->fragments_n = 1;
 988       return IP4_REASS_RC_OK;
 989     }
 990   reass->min_fragment_length =
 991     clib_min (clib_net_to_host_u16 (fip->length),
 992               fvnb->ip.reass.estimated_mtu);
 993   while (~0 != candidate_range_bi)
 994     {
 995       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 996       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 997       if (fragment_first > candidate_vnb->ip.reass.range_last)
 998         {
 999           // this fragments starts after candidate range
1000           prev_range_bi = candidate_range_bi;
1001           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
1002           if (candidate_vnb->ip.reass.range_last < fragment_last &&
1003               ~0 == candidate_range_bi)
1004             {
1005               // special case - this fragment falls beyond all known ranges
1006               rc = ip4_full_reass_insert_range_in_chain (vm, reass,
1007                                                          prev_range_bi, *bi0);
1008               if (IP4_REASS_RC_OK != rc)
1009                 {
1010                   return rc;
1011                 }
1012               consumed = 1;
1013               break;
1014             }
1015           continue;
1016         }
1017       if (fragment_last < candidate_vnb->ip.reass.range_first)
1018         {
1019           // this fragment ends before candidate range without any overlap
1020           rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1021                                                      *bi0);
1022           if (IP4_REASS_RC_OK != rc)
1023             {
1024               return rc;
1025             }
1026           consumed = 1;
1027         }
1028       else
1029         {
1030           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
1031               fragment_last <= candidate_vnb->ip.reass.range_last)
1032             {
1033               // this fragment is a (sub)part of existing range, ignore it
1034               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1035                 {
1036                   ip4_full_reass_add_trace (vm, node, reass, *bi0,
1037                                             RANGE_OVERLAP, 0, ~0);
1038                 }
1039               break;
1040             }
1041           int discard_candidate = 0;
1042           if (fragment_first < candidate_vnb->ip.reass.range_first)
1043             {
1044               u32 overlap =
1045                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
1046               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1047                 {
1048                   candidate_vnb->ip.reass.range_first += overlap;
1049                   if (reass->data_len < overlap)
1050                     {
1051                       return IP4_REASS_RC_INTERNAL_ERROR;
1052                     }
1053                   reass->data_len -= overlap;
1054                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1055                     {
1056                       ip4_full_reass_add_trace (vm, node, reass,
1057                                                 candidate_range_bi,
1058                                                 RANGE_SHRINK, 0, ~0);
1059                     }
1060                   rc = ip4_full_reass_insert_range_in_chain (
1061                     vm, reass, prev_range_bi, *bi0);
1062                   if (IP4_REASS_RC_OK != rc)
1063                     {
1064                       return rc;
1065                     }
1066                   consumed = 1;
1067                 }
1068               else
1069                 {
1070                   discard_candidate = 1;
1071                 }
1072             }
1073           else if (fragment_last > candidate_vnb->ip.reass.range_last)
1074             {
1075               u32 overlap =
1076                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1077               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1078                 {
1079                   fvnb->ip.reass.range_first += overlap;
1080                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1081                     {
1082                       prev_range_bi = candidate_range_bi;
1083                       candidate_range_bi =
1084                         candidate_vnb->ip.reass.next_range_bi;
1085                       continue;
1086                     }
1087                   else
1088                     {
1089                       // special case - last range discarded
1090                       rc = ip4_full_reass_insert_range_in_chain (
1091                         vm, reass, candidate_range_bi, *bi0);
1092                       if (IP4_REASS_RC_OK != rc)
1093                         {
1094                           return rc;
1095                         }
1096                       consumed = 1;
1097                     }
1098                 }
1099               else
1100                 {
1101                   discard_candidate = 1;
1102                 }
1103             }
1104           else
1105             {
1106               discard_candidate = 1;
1107             }
1108           if (discard_candidate)
1109             {
1110               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1111               // discard candidate range, probe next range
1112               rc = ip4_full_reass_remove_range_from_chain (
1113                 vm, node, reass, prev_range_bi, candidate_range_bi);
1114               if (IP4_REASS_RC_OK != rc)
1115                 {
1116                   return rc;
1117                 }
1118               if (~0 != next_range_bi)
1119                 {
1120                   candidate_range_bi = next_range_bi;
1121                   continue;
1122                 }
1123               else
1124                 {
1125                   // special case - last range discarded
1126                   rc = ip4_full_reass_insert_range_in_chain (
1127                     vm, reass, prev_range_bi, *bi0);
1128                   if (IP4_REASS_RC_OK != rc)
1129                     {
1130                       return rc;
1131                     }
1132                   consumed = 1;
1133                 }
1134             }
1135         }
1136       break;
1137     }
1138   ++reass->fragments_n;
1139   if (consumed)
1140     {
1141       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1142         {
1143           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1144         }
1145     }
1146   if (~0 != reass->last_packet_octet &&
1147       reass->data_len == reass->last_packet_octet + 1)
1148     {
1149       *handoff_thread_idx = reass->sendout_thread_index;
1150       int handoff =
1151         reass->memory_owner_thread_index != reass->sendout_thread_index;
1152       rc =
1153         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1154                                  is_custom);
1155       if (IP4_REASS_RC_OK == rc && handoff)
1156         {
1157           rc = IP4_REASS_RC_HANDOFF;
1158         }
1159     }
1160   else
1161     {
1162       if (consumed)
1163         {
1164           *bi0 = ~0;
1165           if (reass->fragments_n > rm->max_reass_len)
1166             {
1167               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1168             }
1169         }
1170       else
1171         {
1172           *next0 = IP4_FULL_REASS_NEXT_DROP;
1173           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1174         }
1175     }
1176   return rc;
1177 }
1178
1179 always_inline uword
1180 ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1181                        vlib_frame_t *frame, ip4_full_reass_node_type_t type,
1182                        bool is_local)
1183 {
1184   u32 *from = vlib_frame_vector_args (frame);
1185   u32 n_left_from, n_left_to_next, *to_next, next_index;
1186   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1187   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1188   clib_spinlock_lock (&rt->lock);
1189
1190   n_left_from = frame->n_vectors;
1191   next_index = node->cached_next_index;
1192   while (n_left_from > 0)
1193     {
1194       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1195
1196       while (n_left_from > 0 && n_left_to_next > 0)
1197         {
1198           u32 bi0;
1199           vlib_buffer_t *b0;
1200           u32 next0;
1201           u32 error0 = IP4_ERROR_NONE;
1202
1203           bi0 = from[0];
1204           b0 = vlib_get_buffer (vm, bi0);
1205
1206           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1207           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1208             {
1209               // this is a whole packet - no fragmentation
1210               if (CUSTOM != type)
1211                 {
1212                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1213                 }
1214               else
1215                 {
1216                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1217                 }
1218               ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
1219                                         ~0);
1220               goto packet_enqueue;
1221             }
1222
1223           if (is_local && !rm->is_local_reass_enabled)
1224             {
1225               next0 = IP4_FULL_REASS_NEXT_DROP;
1226               goto packet_enqueue;
1227             }
1228
1229           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1230           const u32 fragment_length =
1231             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1232           const u32 fragment_last = fragment_first + fragment_length - 1;
1233
1234           /* Keep track of received fragments */
1235           vlib_node_increment_counter (vm, node->node_index,
1236                                        IP4_ERROR_REASS_FRAGMENTS_RCVD, 1);
1237
1238           if (fragment_first > fragment_last ||
1239               fragment_first + fragment_length > UINT16_MAX - 20 ||
1240               (fragment_length < 8 && // 8 is minimum frag length per RFC 791
1241                ip4_get_fragment_more (ip0)))
1242             {
1243               next0 = IP4_FULL_REASS_NEXT_DROP;
1244               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1245               goto packet_enqueue;
1246             }
1247
1248           u32 fib_index = vec_elt (ip4_main.fib_index_by_sw_if_index,
1249                                    vnet_buffer (b0)->sw_if_index[VLIB_RX]);
1250
1251           ip4_full_reass_kv_t kv = { .k.fib_index = fib_index,
1252                                      .k.src.as_u32 = ip0->src_address.as_u32,
1253                                      .k.dst.as_u32 = ip0->dst_address.as_u32,
1254                                      .k.frag_id = ip0->fragment_id,
1255                                      .k.proto = ip0->protocol
1256
1257           };
1258           u8 do_handoff = 0;
1259
1260           ip4_full_reass_t *reass = ip4_full_reass_find_or_create (
1261             vm, node, rm, rt, &kv, &do_handoff, &n_left_to_next, &to_next);
1262
1263           if (reass)
1264             {
1265               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1266               if (0 == fragment_first)
1267                 {
1268                   reass->sendout_thread_index = vm->thread_index;
1269                 }
1270             }
1271
1272           if (PREDICT_FALSE (do_handoff))
1273             {
1274               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1275               vnet_buffer (b0)->ip.reass.owner_thread_index =
1276                 kv.v.memory_owner_thread_index;
1277             }
1278           else if (reass)
1279             {
1280               u32 handoff_thread_idx;
1281               u32 counter = ~0;
1282               switch (ip4_full_reass_update
1283                       (vm, node, rm, rt, reass, &bi0, &next0,
1284                        &error0, CUSTOM == type, &handoff_thread_idx))
1285                 {
1286                 case IP4_REASS_RC_OK:
1287                   /* nothing to do here */
1288                   break;
1289                 case IP4_REASS_RC_HANDOFF:
1290                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1291                   b0 = vlib_get_buffer (vm, bi0);
1292                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1293                     handoff_thread_idx;
1294                   break;
1295                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1296                   counter = IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1297                   break;
1298                 case IP4_REASS_RC_NO_BUF:
1299                   counter = IP4_ERROR_REASS_NO_BUF;
1300                   break;
1301                 case IP4_REASS_RC_INTERNAL_ERROR:
1302                   counter = IP4_ERROR_REASS_INTERNAL_ERROR;
1303                   /* Sanitization is needed in internal error cases only, as
1304                    * the incoming packet is already dropped in other cases,
1305                    * also adding bi0 back to the reassembly list, fixes the
1306                    * leaking of buffers during internal errors.
1307                    *
1308                    * Also it doesnt make sense to send these buffers custom
1309                    * app, these fragments are with internal errors */
1310                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1311                   reass->error_next_index = ~0;
1312                   break;
1313                 }
1314
1315               if (~0 != counter)
1316                 {
1317                   vlib_node_increment_counter (vm, node->node_index, counter,
1318                                                1);
1319                   ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1320                                            &to_next);
1321                   ip4_full_reass_free (rm, rt, reass);
1322                   goto next_packet;
1323                 }
1324             }
1325           else
1326             {
1327               next0 = IP4_FULL_REASS_NEXT_DROP;
1328               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1329             }
1330
1331
1332         packet_enqueue:
1333
1334           if (bi0 != ~0)
1335             {
1336               to_next[0] = bi0;
1337               to_next += 1;
1338               n_left_to_next -= 1;
1339
1340               /* bi0 might have been updated by reass_finalize, reload */
1341               b0 = vlib_get_buffer (vm, bi0);
1342               if (IP4_ERROR_NONE != error0)
1343                 {
1344                   b0->error = node->errors[error0];
1345                 }
1346
1347               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1348                 {
1349                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1350                     {
1351                       ip4_full_reass_add_trace (
1352                         vm, node, NULL, bi0, HANDOFF, 0,
1353                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1354                     }
1355                 }
1356               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1357                 {
1358                   vnet_feature_next (&next0, b0);
1359                 }
1360
1361               /* Increment the counter to-custom-app also as this fragment is
1362                * also going to application */
1363               if (CUSTOM == type)
1364                 {
1365                   vlib_node_increment_counter (
1366                     vm, node->node_index, IP4_ERROR_REASS_TO_CUSTOM_APP, 1);
1367                 }
1368
1369               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1370                                                to_next, n_left_to_next,
1371                                                bi0, next0);
1372               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1373             }
1374
1375         next_packet:
1376           from += 1;
1377           n_left_from -= 1;
1378         }
1379
1380       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1381     }
1382
1383   clib_spinlock_unlock (&rt->lock);
1384   return frame->n_vectors;
1385 }
1386
1387 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1388                                     vlib_node_runtime_t * node,
1389                                     vlib_frame_t * frame)
1390 {
1391   return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
1392 }
1393
1394 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1395     .name = "ip4-full-reassembly",
1396     .vector_size = sizeof (u32),
1397     .format_trace = format_ip4_full_reass_trace,
1398     .n_errors = IP4_N_ERROR,
1399     .error_counters = ip4_error_counters,
1400     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1401     .next_nodes =
1402         {
1403                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1404                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1405                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1406
1407         },
1408 };
1409
1410 VLIB_NODE_FN (ip4_local_full_reass_node)
1411 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1412 {
1413   return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
1414 }
1415
1416 VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
1417     .name = "ip4-local-full-reassembly",
1418     .vector_size = sizeof (u32),
1419     .format_trace = format_ip4_full_reass_trace,
1420     .n_errors = IP4_N_ERROR,
1421     .error_counters = ip4_error_counters,
1422     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1423     .next_nodes =
1424         {
1425                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1426                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1427                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
1428
1429         },
1430 };
1431
1432 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1433                                             vlib_node_runtime_t * node,
1434                                             vlib_frame_t * frame)
1435 {
1436   return ip4_full_reass_inline (vm, node, frame, FEATURE,
1437                                 false /* is_local */);
1438 }
1439
1440 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1441     .name = "ip4-full-reassembly-feature",
1442     .vector_size = sizeof (u32),
1443     .format_trace = format_ip4_full_reass_trace,
1444     .n_errors = IP4_N_ERROR,
1445     .error_counters = ip4_error_counters,
1446     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1447     .next_nodes =
1448         {
1449                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1450                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1451                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1452         },
1453 };
1454
1455 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1456     .arc_name = "ip4-unicast",
1457     .node_name = "ip4-full-reassembly-feature",
1458     .runs_before = VNET_FEATURES ("ip4-lookup",
1459                                   "ipsec4-input-feature"),
1460     .runs_after = 0,
1461 };
1462
1463 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1464                                            vlib_node_runtime_t * node,
1465                                            vlib_frame_t * frame)
1466 {
1467   return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
1468 }
1469
1470 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1471     .name = "ip4-full-reassembly-custom",
1472     .vector_size = sizeof (u32),
1473     .format_trace = format_ip4_full_reass_trace,
1474     .n_errors = IP4_N_ERROR,
1475     .error_counters = ip4_error_counters,
1476     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1477     .next_nodes =
1478         {
1479                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1480                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1481                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1482         },
1483 };
1484
1485 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1486     .arc_name = "ip4-unicast",
1487     .node_name = "ip4-full-reassembly-feature",
1488     .runs_before = VNET_FEATURES ("ip4-lookup",
1489                                   "ipsec4-input-feature"),
1490     .runs_after = 0,
1491 };
1492
1493
1494 #ifndef CLIB_MARCH_VARIANT
1495 uword
1496 ip4_full_reass_custom_register_next_node (uword node_index)
1497 {
1498   return vlib_node_add_next (vlib_get_main (),
1499                              ip4_full_reass_node_custom.index, node_index);
1500 }
1501
1502 always_inline u32
1503 ip4_full_reass_get_nbuckets ()
1504 {
1505   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1506   u32 nbuckets;
1507   u8 i;
1508
1509   /* need more mem with more workers */
1510   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1511                     IP4_REASS_HT_LOAD_FACTOR);
1512
1513   for (i = 0; i < 31; i++)
1514     if ((1 << i) >= nbuckets)
1515       break;
1516   nbuckets = 1 << i;
1517
1518   return nbuckets;
1519 }
1520 #endif /* CLIB_MARCH_VARIANT */
1521
1522 typedef enum
1523 {
1524   IP4_EVENT_CONFIG_CHANGED = 1,
1525 } ip4_full_reass_event_t;
1526
1527 typedef struct
1528 {
1529   int failure;
1530   clib_bihash_16_8_t *new_hash;
1531 } ip4_rehash_cb_ctx;
1532
1533 #ifndef CLIB_MARCH_VARIANT
1534 static int
1535 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1536 {
1537   ip4_rehash_cb_ctx *ctx = _ctx;
1538   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1539     {
1540       ctx->failure = 1;
1541     }
1542   return (BIHASH_WALK_CONTINUE);
1543 }
1544
1545 static void
1546 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1547                            u32 max_reassembly_length,
1548                            u32 expire_walk_interval_ms)
1549 {
1550   ip4_full_reass_main.timeout_ms = timeout_ms;
1551   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1552   ip4_full_reass_main.max_reass_n = max_reassemblies;
1553   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1554   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1555 }
1556
1557 vnet_api_error_t
1558 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1559                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1560 {
1561   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1562   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1563                              max_reassembly_length, expire_walk_interval_ms);
1564   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1565                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1566                              IP4_EVENT_CONFIG_CHANGED, 0);
1567   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1568   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1569     {
1570       clib_bihash_16_8_t new_hash;
1571       clib_memset (&new_hash, 0, sizeof (new_hash));
1572       ip4_rehash_cb_ctx ctx;
1573       ctx.failure = 0;
1574       ctx.new_hash = &new_hash;
1575       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1576                              new_nbuckets * 1024);
1577       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1578                                                ip4_rehash_cb, &ctx);
1579       if (ctx.failure)
1580         {
1581           clib_bihash_free_16_8 (&new_hash);
1582           return -1;
1583         }
1584       else
1585         {
1586           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1587           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1588                             sizeof (ip4_full_reass_main.hash));
1589           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1590         }
1591     }
1592   return 0;
1593 }
1594
1595 vnet_api_error_t
1596 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1597                     u32 * max_reassembly_length,
1598                     u32 * expire_walk_interval_ms)
1599 {
1600   *timeout_ms = ip4_full_reass_main.timeout_ms;
1601   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1602   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1603   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1604   return 0;
1605 }
1606
1607 static clib_error_t *
1608 ip4_full_reass_init_function (vlib_main_t * vm)
1609 {
1610   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1611   clib_error_t *error = 0;
1612   u32 nbuckets;
1613   vlib_node_t *node;
1614
1615   rm->vlib_main = vm;
1616
1617   vec_validate (rm->per_thread_data, vlib_num_workers ());
1618   ip4_full_reass_per_thread_t *rt;
1619   vec_foreach (rt, rm->per_thread_data)
1620   {
1621     clib_spinlock_init (&rt->lock);
1622     pool_alloc (rt->pool, rm->max_reass_n);
1623   }
1624
1625   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1626   ASSERT (node);
1627   rm->ip4_full_reass_expire_node_idx = node->index;
1628
1629   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1630                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1631                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1632                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1633
1634   nbuckets = ip4_full_reass_get_nbuckets ();
1635   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1636
1637   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1638   rm->fq_local_index =
1639     vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
1640   rm->fq_feature_index =
1641     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1642   rm->fq_custom_index =
1643     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1644
1645   rm->feature_use_refcount_per_intf = NULL;
1646   rm->is_local_reass_enabled = 1;
1647
1648   return error;
1649 }
1650
1651 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1652 #endif /* CLIB_MARCH_VARIANT */
1653
1654 static uword
1655 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1656                              CLIB_UNUSED (vlib_frame_t *f))
1657 {
1658   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1659   uword event_type, *event_data = 0;
1660
1661   while (true)
1662     {
1663       vlib_process_wait_for_event_or_clock (vm,
1664                                             (f64)
1665                                             rm->expire_walk_interval_ms /
1666                                             (f64) MSEC_PER_SEC);
1667       event_type = vlib_process_get_events (vm, &event_data);
1668
1669       switch (event_type)
1670         {
1671         case ~0:
1672           /* no events => timeout */
1673           /* fallthrough */
1674         case IP4_EVENT_CONFIG_CHANGED:
1675           /* nothing to do here */
1676           break;
1677         default:
1678           clib_warning ("BUG: event type 0x%wx", event_type);
1679           break;
1680         }
1681       f64 now = vlib_time_now (vm);
1682
1683       ip4_full_reass_t *reass;
1684       int *pool_indexes_to_free = NULL;
1685
1686       uword thread_index = 0;
1687       int index;
1688       const uword nthreads = vlib_num_workers () + 1;
1689       u32 n_left_to_next, *to_next;
1690
1691       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1692         {
1693           ip4_full_reass_per_thread_t *rt =
1694             &rm->per_thread_data[thread_index];
1695           clib_spinlock_lock (&rt->lock);
1696
1697           vec_reset_length (pool_indexes_to_free);
1698
1699           /* Pace the number of timeouts handled per thread,to avoid barrier
1700            * sync issues in real world scenarios */
1701
1702           u32 beg = rt->last_id;
1703           /* to ensure we walk at least once per sec per context */
1704           u32 end =
1705             beg + (IP4_REASS_MAX_REASSEMBLIES_DEFAULT *
1706                      IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS / MSEC_PER_SEC +
1707                    1);
1708           if (end > vec_len (rt->pool))
1709             {
1710               end = vec_len (rt->pool);
1711               rt->last_id = 0;
1712             }
1713           else
1714             {
1715               rt->last_id = end;
1716             }
1717
1718           pool_foreach_stepping_index (index, beg, end, rt->pool)
1719           {
1720             reass = pool_elt_at_index (rt->pool, index);
1721             if (now > reass->last_heard + rm->timeout)
1722               {
1723                 vec_add1 (pool_indexes_to_free, index);
1724               }
1725           }
1726
1727           if (vec_len (pool_indexes_to_free))
1728             vlib_node_increment_counter (vm, node->node_index,
1729                                          IP4_ERROR_REASS_TIMEOUT,
1730                                          vec_len (pool_indexes_to_free));
1731           int *i;
1732           vec_foreach (i, pool_indexes_to_free)
1733           {
1734             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1735             ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1736                                      &to_next);
1737             ip4_full_reass_free (rm, rt, reass);
1738           }
1739
1740           clib_spinlock_unlock (&rt->lock);
1741         }
1742
1743       vec_free (pool_indexes_to_free);
1744       if (event_data)
1745         {
1746           vec_set_len (event_data, 0);
1747         }
1748     }
1749
1750   return 0;
1751 }
1752
1753 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1754   .function = ip4_full_reass_walk_expired,
1755   .type = VLIB_NODE_TYPE_PROCESS,
1756   .name = "ip4-full-reassembly-expire-walk",
1757   .format_trace = format_ip4_full_reass_trace,
1758   .n_errors = IP4_N_ERROR,
1759   .error_counters = ip4_error_counters,
1760 };
1761
1762 static u8 *
1763 format_ip4_full_reass_key (u8 * s, va_list * args)
1764 {
1765   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1766   s =
1767     format (s, "fib_index: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1768             key->fib_index, format_ip4_address, &key->src, format_ip4_address,
1769             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1770   return s;
1771 }
1772
1773 static u8 *
1774 format_ip4_reass (u8 * s, va_list * args)
1775 {
1776   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1777   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1778
1779   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1780               "last_packet_octet: %u, trace_op_counter: %u\n",
1781               reass->id, format_ip4_full_reass_key, &reass->key,
1782               reass->first_bi, reass->data_len,
1783               reass->last_packet_octet, reass->trace_op_counter);
1784
1785   u32 bi = reass->first_bi;
1786   u32 counter = 0;
1787   while (~0 != bi)
1788     {
1789       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1790       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1791       s =
1792         format (s,
1793                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1794                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1795                 vnb->ip.reass.range_last, bi,
1796                 ip4_full_reass_buffer_get_data_offset (b),
1797                 ip4_full_reass_buffer_get_data_len (b),
1798                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1799       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1800         {
1801           bi = b->next_buffer;
1802         }
1803       else
1804         {
1805           bi = ~0;
1806         }
1807     }
1808   return s;
1809 }
1810
1811 static clib_error_t *
1812 show_ip4_reass (vlib_main_t * vm,
1813                 unformat_input_t * input,
1814                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1815 {
1816   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1817
1818   vlib_cli_output (vm, "---------------------");
1819   vlib_cli_output (vm, "IP4 reassembly status");
1820   vlib_cli_output (vm, "---------------------");
1821   bool details = false;
1822   if (unformat (input, "details"))
1823     {
1824       details = true;
1825     }
1826
1827   u32 sum_reass_n = 0;
1828   ip4_full_reass_t *reass;
1829   uword thread_index;
1830   const uword nthreads = vlib_num_workers () + 1;
1831   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1832     {
1833       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1834       clib_spinlock_lock (&rt->lock);
1835       if (details)
1836         {
1837           pool_foreach (reass, rt->pool) {
1838             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1839           }
1840         }
1841       sum_reass_n += rt->reass_n;
1842       clib_spinlock_unlock (&rt->lock);
1843     }
1844   vlib_cli_output (vm, "---------------------");
1845   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1846                    (long unsigned) sum_reass_n);
1847   vlib_cli_output (vm,
1848                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1849                    (long unsigned) rm->max_reass_n);
1850   vlib_cli_output (vm,
1851                    "Maximum configured amount of fragments "
1852                    "per full IP4 reassembly: %lu\n",
1853                    (long unsigned) rm->max_reass_len);
1854   vlib_cli_output (vm,
1855                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1856                    (long unsigned) rm->timeout_ms);
1857   vlib_cli_output (vm,
1858                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1859                    (long unsigned) rm->expire_walk_interval_ms);
1860   return 0;
1861 }
1862
1863 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1864     .path = "show ip4-full-reassembly",
1865     .short_help = "show ip4-full-reassembly [details]",
1866     .function = show_ip4_reass,
1867 };
1868
1869 #ifndef CLIB_MARCH_VARIANT
1870 vnet_api_error_t
1871 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1872 {
1873   return vnet_feature_enable_disable ("ip4-unicast",
1874                                       "ip4-full-reassembly-feature",
1875                                       sw_if_index, enable_disable, 0, 0);
1876 }
1877 #endif /* CLIB_MARCH_VARIANT */
1878
1879
1880 #define foreach_ip4_full_reass_handoff_error                       \
1881 _(CONGESTION_DROP, "congestion drop")
1882
1883
1884 typedef enum
1885 {
1886 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1887   foreach_ip4_full_reass_handoff_error
1888 #undef _
1889     IP4_FULL_REASS_HANDOFF_N_ERROR,
1890 } ip4_full_reass_handoff_error_t;
1891
1892 static char *ip4_full_reass_handoff_error_strings[] = {
1893 #define _(sym,string) string,
1894   foreach_ip4_full_reass_handoff_error
1895 #undef _
1896 };
1897
1898 typedef struct
1899 {
1900   u32 next_worker_index;
1901 } ip4_full_reass_handoff_trace_t;
1902
1903 static u8 *
1904 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1905 {
1906   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1907   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1908   ip4_full_reass_handoff_trace_t *t =
1909     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1910
1911   s =
1912     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1913             t->next_worker_index);
1914
1915   return s;
1916 }
1917
1918 always_inline uword
1919 ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1920                                     vlib_frame_t *frame,
1921                                     ip4_full_reass_node_type_t type,
1922                                     bool is_local)
1923 {
1924   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1925
1926   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1927   u32 n_enq, n_left_from, *from;
1928   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1929   u32 fq_index;
1930
1931   from = vlib_frame_vector_args (frame);
1932   n_left_from = frame->n_vectors;
1933   vlib_get_buffers (vm, from, bufs, n_left_from);
1934
1935   b = bufs;
1936   ti = thread_indices;
1937
1938   switch (type)
1939     {
1940     case NORMAL:
1941       if (is_local)
1942         {
1943           fq_index = rm->fq_local_index;
1944         }
1945       else
1946         {
1947           fq_index = rm->fq_index;
1948         }
1949       break;
1950     case FEATURE:
1951       fq_index = rm->fq_feature_index;
1952       break;
1953     case CUSTOM:
1954       fq_index = rm->fq_custom_index;
1955       break;
1956     default:
1957       clib_warning ("Unexpected `type' (%d)!", type);
1958     }
1959
1960   while (n_left_from > 0)
1961     {
1962       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1963
1964       if (PREDICT_FALSE
1965           ((node->flags & VLIB_NODE_FLAG_TRACE)
1966            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1967         {
1968           ip4_full_reass_handoff_trace_t *t =
1969             vlib_add_trace (vm, node, b[0], sizeof (*t));
1970           t->next_worker_index = ti[0];
1971         }
1972
1973       n_left_from -= 1;
1974       ti += 1;
1975       b += 1;
1976     }
1977   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1978                                          thread_indices, frame->n_vectors, 1);
1979
1980   if (n_enq < frame->n_vectors)
1981     vlib_node_increment_counter (vm, node->node_index,
1982                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1983                                  frame->n_vectors - n_enq);
1984   return frame->n_vectors;
1985 }
1986
1987 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1988                                             vlib_node_runtime_t * node,
1989                                             vlib_frame_t * frame)
1990 {
1991   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1992                                              false /* is_local */);
1993 }
1994
1995
1996 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1997   .name = "ip4-full-reassembly-handoff",
1998   .vector_size = sizeof (u32),
1999   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2000   .error_strings = ip4_full_reass_handoff_error_strings,
2001   .format_trace = format_ip4_full_reass_handoff_trace,
2002
2003   .n_next_nodes = 1,
2004
2005   .next_nodes = {
2006     [0] = "error-drop",
2007   },
2008 };
2009
2010 VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
2011 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
2012 {
2013   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
2014                                              true /* is_local */);
2015 }
2016
2017 VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
2018   .name = "ip4-local-full-reassembly-handoff",
2019   .vector_size = sizeof (u32),
2020   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2021   .error_strings = ip4_full_reass_handoff_error_strings,
2022   .format_trace = format_ip4_full_reass_handoff_trace,
2023
2024   .n_next_nodes = 1,
2025
2026   .next_nodes = {
2027     [0] = "error-drop",
2028   },
2029 };
2030
2031 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
2032                                                     vlib_node_runtime_t *
2033                                                     node,
2034                                                     vlib_frame_t * frame)
2035 {
2036   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
2037                                              false /* is_local */);
2038 }
2039
2040 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
2041   .name = "ip4-full-reass-feature-hoff",
2042   .vector_size = sizeof (u32),
2043   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2044   .error_strings = ip4_full_reass_handoff_error_strings,
2045   .format_trace = format_ip4_full_reass_handoff_trace,
2046
2047   .n_next_nodes = 1,
2048
2049   .next_nodes = {
2050     [0] = "error-drop",
2051   },
2052 };
2053
2054 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
2055                                                     vlib_node_runtime_t *
2056                                                     node,
2057                                                     vlib_frame_t * frame)
2058 {
2059   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
2060                                              false /* is_local */);
2061 }
2062
2063 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
2064   .name = "ip4-full-reass-custom-hoff",
2065   .vector_size = sizeof (u32),
2066   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2067   .error_strings = ip4_full_reass_handoff_error_strings,
2068   .format_trace = format_ip4_full_reass_handoff_trace,
2069
2070   .n_next_nodes = 1,
2071
2072   .next_nodes = {
2073     [0] = "error-drop",
2074   },
2075 };
2076
2077 #ifndef CLIB_MARCH_VARIANT
2078 int
2079 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2080 {
2081   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
2082   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2083   if (is_enable)
2084     {
2085       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2086         {
2087           ++rm->feature_use_refcount_per_intf[sw_if_index];
2088           return vnet_feature_enable_disable ("ip4-unicast",
2089                                               "ip4-full-reassembly-feature",
2090                                               sw_if_index, 1, 0, 0);
2091         }
2092       ++rm->feature_use_refcount_per_intf[sw_if_index];
2093     }
2094   else
2095     {
2096       --rm->feature_use_refcount_per_intf[sw_if_index];
2097       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2098         return vnet_feature_enable_disable ("ip4-unicast",
2099                                             "ip4-full-reassembly-feature",
2100                                             sw_if_index, 0, 0, 0);
2101     }
2102   return -1;
2103 }
2104
2105 void
2106 ip4_local_full_reass_enable_disable (int enable)
2107 {
2108   if (enable)
2109     {
2110       ip4_full_reass_main.is_local_reass_enabled = 1;
2111     }
2112   else
2113     {
2114       ip4_full_reass_main.is_local_reass_enabled = 0;
2115     }
2116 }
2117
2118 int
2119 ip4_local_full_reass_enabled ()
2120 {
2121   return ip4_full_reass_main.is_local_reass_enabled;
2122 }
2123
2124 #endif
2125
2126 /*
2127  * fd.io coding-style-patch-verification: ON
2128  *
2129  * Local Variables:
2130  * eval: (c-set-style "gnu")
2131  * End:
2132  */