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 <vppinfra/fifo.h>
  27 #include <vppinfra/bihash_16_8.h>
  28 #include <vnet/ip/reass/ip4_full_reass.h>
  29 #include <stddef.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  34 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 #define IP4_REASS_DEBUG_BUFFERS 0
  39 #if IP4_REASS_DEBUG_BUFFERS
  40 #define IP4_REASS_DEBUG_BUFFER(bi, what)             \
  41   do                                                 \
  42     {                                                \
  43       u32 _bi = bi;                                  \
  44       printf (#what "buffer %u", _bi);               \
  45       vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
  46       while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)   \
  47         {                                            \
  48           _bi = _b->next_buffer;                     \
  49           printf ("[%u]", _bi);                      \
  50           _b = vlib_get_buffer (vm, _bi);            \
  51         }                                            \
  52       printf ("\n");                                 \
  53       fflush (stdout);                               \
  54     }                                                \
  55   while (0)
  56 #else
  57 #define IP4_REASS_DEBUG_BUFFER(...)
  58 #endif
  59
  60 typedef enum
  61 {
  62   IP4_REASS_RC_OK,
  63   IP4_REASS_RC_TOO_MANY_FRAGMENTS,
  64   IP4_REASS_RC_INTERNAL_ERROR,
  65   IP4_REASS_RC_NO_BUF,
  66   IP4_REASS_RC_HANDOFF,
  67 } ip4_full_reass_rc_t;
  68
  69 typedef struct
  70 {
  71   union
  72   {
  73     struct
  74     {
  75       u32 xx_id;
  76       ip4_address_t src;
  77       ip4_address_t dst;
  78       u16 frag_id;
  79       u8 proto;
  80       u8 unused;
  81     };
  82     u64 as_u64[2];
  83   };
  84 } ip4_full_reass_key_t;
  85
  86 typedef union
  87 {
  88   struct
  89   {
  90     u32 reass_index;
  91     u32 memory_owner_thread_index;
  92   };
  93   u64 as_u64;
  94 } ip4_full_reass_val_t;
  95
  96 typedef union
  97 {
  98   struct
  99   {
 100     ip4_full_reass_key_t k;
 101     ip4_full_reass_val_t v;
 102   };
 103   clib_bihash_kv_16_8_t kv;
 104 } ip4_full_reass_kv_t;
 105
 106 always_inline u32
 107 ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
 108 {
 109   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 110   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
 111 }
 112
 113 always_inline u16
 114 ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
 115 {
 116   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 117   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 118     (vnb->ip.reass.fragment_first +
 119      ip4_full_reass_buffer_get_data_offset (b)) + 1;
 120 }
 121
 122 typedef struct
 123 {
 124   // hash table key
 125   ip4_full_reass_key_t key;
 126   // time when last packet was received
 127   f64 last_heard;
 128   // internal id of this reassembly
 129   u64 id;
 130   // buffer index of first buffer in this reassembly context
 131   u32 first_bi;
 132   // last octet of packet, ~0 until fragment without more_fragments arrives
 133   u32 last_packet_octet;
 134   // length of data collected so far
 135   u32 data_len;
 136   // trace operation counter
 137   u32 trace_op_counter;
 138   // next index - used by non-feature node
 139   u32 next_index;
 140   // error next index - used by custom apps (~0 if not used)
 141   u32 error_next_index;
 142   // minimum fragment length for this reassembly - used to estimate MTU
 143   u16 min_fragment_length;
 144   // number of fragments in this reassembly
 145   u32 fragments_n;
 146   // thread owning memory for this context (whose pool contains this ctx)
 147   u32 memory_owner_thread_index;
 148   // thread which received fragment with offset 0 and which sends out the
 149   // completed reassembly
 150   u32 sendout_thread_index;
 151 } ip4_full_reass_t;
 152
 153 typedef struct
 154 {
 155   ip4_full_reass_t *pool;
 156   u32 reass_n;
 157   u32 id_counter;
 158   clib_spinlock_t lock;
 159 } ip4_full_reass_per_thread_t;
 160
 161 typedef struct
 162 {
 163   // IPv4 config
 164   u32 timeout_ms;
 165   f64 timeout;
 166   u32 expire_walk_interval_ms;
 167   // maximum number of fragments in one reassembly
 168   u32 max_reass_len;
 169   // maximum number of reassemblies
 170   u32 max_reass_n;
 171
 172   // IPv4 runtime
 173   clib_bihash_16_8_t hash;
 174   // per-thread data
 175   ip4_full_reass_per_thread_t *per_thread_data;
 176
 177   // convenience
 178   vlib_main_t *vlib_main;
 179
 180   u32 ip4_full_reass_expire_node_idx;
 181
 182   /** Worker handoff */
 183   u32 fq_index;
 184   u32 fq_local_index;
 185   u32 fq_feature_index;
 186   u32 fq_custom_index;
 187
 188   // reference count for enabling/disabling feature - per interface
 189   u32 *feature_use_refcount_per_intf;
 190
 191   // whether local fragmented packets are reassembled or not
 192   int is_local_reass_enabled;
 193 } ip4_full_reass_main_t;
 194
 195 extern ip4_full_reass_main_t ip4_full_reass_main;
 196
 197 #ifndef CLIB_MARCH_VARIANT
 198 ip4_full_reass_main_t ip4_full_reass_main;
 199 #endif /* CLIB_MARCH_VARIANT */
 200
 201 typedef enum
 202 {
 203   IP4_FULL_REASS_NEXT_INPUT,
 204   IP4_FULL_REASS_NEXT_DROP,
 205   IP4_FULL_REASS_NEXT_HANDOFF,
 206   IP4_FULL_REASS_N_NEXT,
 207 } ip4_full_reass_next_t;
 208
 209 typedef enum
 210 {
 211   NORMAL,
 212   FEATURE,
 213   CUSTOM
 214 } ip4_full_reass_node_type_t;
 215
 216 typedef enum
 217 {
 218   RANGE_NEW,
 219   RANGE_SHRINK,
 220   RANGE_DISCARD,
 221   RANGE_OVERLAP,
 222   FINALIZE,
 223   HANDOFF,
 224   PASSTHROUGH,
 225 } ip4_full_reass_trace_operation_e;
 226
 227 typedef struct
 228 {
 229   u16 range_first;
 230   u16 range_last;
 231   u32 range_bi;
 232   i32 data_offset;
 233   u32 data_len;
 234   u32 first_bi;
 235 } ip4_full_reass_range_trace_t;
 236
 237 typedef struct
 238 {
 239   ip4_full_reass_trace_operation_e action;
 240   u32 reass_id;
 241   ip4_full_reass_range_trace_t trace_range;
 242   u32 size_diff;
 243   u32 op_id;
 244   u32 thread_id;
 245   u32 thread_id_to;
 246   u32 fragment_first;
 247   u32 fragment_last;
 248   u32 total_data_len;
 249   bool is_after_handoff;
 250   ip4_header_t ip4_header;
 251 } ip4_full_reass_trace_t;
 252
 253 extern vlib_node_registration_t ip4_full_reass_node;
 254 extern vlib_node_registration_t ip4_full_reass_node_feature;
 255 extern vlib_node_registration_t ip4_full_reass_node_custom;
 256
 257 static void
 258 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 259                               ip4_full_reass_range_trace_t * trace)
 260 {
 261   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 262   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 263   trace->range_first = vnb->ip.reass.range_first;
 264   trace->range_last = vnb->ip.reass.range_last;
 265   trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
 266   trace->data_len = ip4_full_reass_buffer_get_data_len (b);
 267   trace->range_bi = bi;
 268 }
 269
 270 static u8 *
 271 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
 272 {
 273   ip4_full_reass_range_trace_t *trace =
 274     va_arg (*args, ip4_full_reass_range_trace_t *);
 275   s =
 276     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 277             trace->range_last, trace->data_offset, trace->data_len,
 278             trace->range_bi);
 279   return s;
 280 }
 281
 282 static u8 *
 283 format_ip4_full_reass_trace (u8 * s, va_list * args)
 284 {
 285   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 286   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 287   ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
 288   u32 indent = 0;
 289   if (~0 != t->reass_id)
 290     {
 291       if (t->is_after_handoff)
 292         {
 293           s =
 294             format (s, "%U\n", format_ip4_header, &t->ip4_header,
 295                     sizeof (t->ip4_header));
 296           indent = 2;
 297         }
 298       s =
 299         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 300                 t->reass_id, t->op_id);
 301       indent = format_get_indent (s);
 302       s =
 303         format (s,
 304                 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 305                 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 306                 t->fragment_last);
 307     }
 308   switch (t->action)
 309     {
 310     case RANGE_SHRINK:
 311       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 312                   format_ip4_full_reass_range_trace, &t->trace_range,
 313                   t->size_diff);
 314       break;
 315     case RANGE_DISCARD:
 316       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 317                   format_ip4_full_reass_range_trace, &t->trace_range);
 318       break;
 319     case RANGE_NEW:
 320       s = format (s, "\n%Unew %U", format_white_space, indent,
 321                   format_ip4_full_reass_range_trace, &t->trace_range);
 322       break;
 323     case RANGE_OVERLAP:
 324       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 325                   format_ip4_full_reass_range_trace, &t->trace_range);
 326       break;
 327     case FINALIZE:
 328       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 329       break;
 330     case HANDOFF:
 331       s =
 332         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 333                 t->thread_id_to);
 334       break;
 335     case PASSTHROUGH:
 336       s = format (s, "passthrough - not a fragment");
 337       break;
 338     }
 339   return s;
 340 }
 341
 342 static void
 343 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 344                           ip4_full_reass_t * reass, u32 bi,
 345                           ip4_full_reass_trace_operation_e action,
 346                           u32 size_diff, u32 thread_id_to)
 347 {
 348   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 349   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 350   if (pool_is_free_index
 351       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 352     {
 353       // this buffer's trace is gone
 354       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 355       return;
 356     }
 357   bool is_after_handoff = false;
 358   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 359     {
 360       is_after_handoff = true;
 361     }
 362   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 363   t->is_after_handoff = is_after_handoff;
 364   if (t->is_after_handoff)
 365     {
 366       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 367                    clib_min (sizeof (t->ip4_header), b->current_length));
 368     }
 369   if (reass)
 370     {
 371       t->reass_id = reass->id;
 372       t->op_id = reass->trace_op_counter;
 373       t->trace_range.first_bi = reass->first_bi;
 374       t->total_data_len = reass->data_len;
 375       ++reass->trace_op_counter;
 376     }
 377   else
 378     {
 379       t->reass_id = ~0;
 380       t->op_id = 0;
 381       t->trace_range.first_bi = 0;
 382       t->total_data_len = 0;
 383     }
 384   t->action = action;
 385   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 386   t->size_diff = size_diff;
 387   t->thread_id = vm->thread_index;
 388   t->thread_id_to = thread_id_to;
 389   t->fragment_first = vnb->ip.reass.fragment_first;
 390   t->fragment_last = vnb->ip.reass.fragment_last;
 391 #if 0
 392   static u8 *s = NULL;
 393   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 394   printf ("%.*s\n", vec_len (s), s);
 395   fflush (stdout);
 396   vec_reset_length (s);
 397 #endif
 398 }
 399
 400 always_inline void
 401 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 402                          ip4_full_reass_t * reass)
 403 {
 404   pool_put (rt->pool, reass);
 405   --rt->reass_n;
 406 }
 407
 408 always_inline void
 409 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 410                      ip4_full_reass_per_thread_t * rt,
 411                      ip4_full_reass_t * reass)
 412 {
 413   clib_bihash_kv_16_8_t kv;
 414   kv.key[0] = reass->key.as_u64[0];
 415   kv.key[1] = reass->key.as_u64[1];
 416   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 417   return ip4_full_reass_free_ctx (rt, reass);
 418 }
 419
 420 always_inline void
 421 ip4_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 422                          ip4_full_reass_t *reass, u32 offending_bi)
 423 {
 424   u32 range_bi = reass->first_bi;
 425   vlib_buffer_t *range_b;
 426   vnet_buffer_opaque_t *range_vnb;
 427   u32 *to_free = NULL;
 428   while (~0 != range_bi)
 429     {
 430       range_b = vlib_get_buffer (vm, range_bi);
 431       range_vnb = vnet_buffer (range_b);
 432       u32 bi = range_bi;
 433       while (~0 != bi)
 434         {
 435           vec_add1 (to_free, bi);
 436           if (offending_bi == bi)
 437             {
 438               offending_bi = ~0;
 439             }
 440           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 441           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 442             {
 443               bi = b->next_buffer;
 444               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 445             }
 446           else
 447             {
 448               bi = ~0;
 449             }
 450         }
 451       range_bi = range_vnb->ip.reass.next_range_bi;
 452     }
 453   if (~0 != offending_bi)
 454     {
 455       vec_add1 (to_free, offending_bi);
 456     }
 457   /* send to next_error_index */
 458   if (~0 != reass->error_next_index)
 459     {
 460       u32 n_left_to_next, *to_next, next_index;
 461
 462       next_index = reass->error_next_index;
 463       u32 bi = ~0;
 464
 465       while (vec_len (to_free) > 0)
 466         {
 467           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 468
 469           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 470             {
 471               bi = vec_pop (to_free);
 472
 473               if (~0 != bi)
 474                 {
 475                   to_next[0] = bi;
 476                   to_next += 1;
 477                   n_left_to_next -= 1;
 478                 }
 479             }
 480           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 481         }
 482     }
 483   else
 484     {
 485       vlib_buffer_free (vm, to_free, vec_len (to_free));
 486     }
 487   vec_free (to_free);
 488 }
 489
 490 always_inline void
 491 ip4_full_reass_init (ip4_full_reass_t * reass)
 492 {
 493   reass->first_bi = ~0;
 494   reass->last_packet_octet = ~0;
 495   reass->data_len = 0;
 496   reass->next_index = ~0;
 497   reass->error_next_index = ~0;
 498 }
 499
 500 always_inline ip4_full_reass_t *
 501 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 502                                ip4_full_reass_main_t * rm,
 503                                ip4_full_reass_per_thread_t * rt,
 504                                ip4_full_reass_kv_t * kv, u8 * do_handoff)
 505 {
 506   ip4_full_reass_t *reass;
 507   f64 now;
 508
 509 again:
 510
 511   reass = NULL;
 512   now = vlib_time_now (vm);
 513   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 514     {
 515       if (vm->thread_index != kv->v.memory_owner_thread_index)
 516         {
 517           *do_handoff = 1;
 518           return NULL;
 519         }
 520       reass =
 521         pool_elt_at_index (rm->per_thread_data
 522                            [kv->v.memory_owner_thread_index].pool,
 523                            kv->v.reass_index);
 524
 525       if (now > reass->last_heard + rm->timeout)
 526         {
 527           ip4_full_reass_drop_all (vm, node, reass, ~0);
 528           ip4_full_reass_free (rm, rt, reass);
 529           reass = NULL;
 530         }
 531     }
 532
 533   if (reass)
 534     {
 535       reass->last_heard = now;
 536       return reass;
 537     }
 538
 539   if (rt->reass_n >= rm->max_reass_n)
 540     {
 541       reass = NULL;
 542       return reass;
 543     }
 544   else
 545     {
 546       pool_get (rt->pool, reass);
 547       clib_memset (reass, 0, sizeof (*reass));
 548       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 549       reass->memory_owner_thread_index = vm->thread_index;
 550       ++rt->id_counter;
 551       ip4_full_reass_init (reass);
 552       ++rt->reass_n;
 553     }
 554
 555   reass->key.as_u64[0] = kv->kv.key[0];
 556   reass->key.as_u64[1] = kv->kv.key[1];
 557   kv->v.reass_index = (reass - rt->pool);
 558   kv->v.memory_owner_thread_index = vm->thread_index;
 559   reass->last_heard = now;
 560
 561   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 562   if (rv)
 563     {
 564       ip4_full_reass_free_ctx (rt, reass);
 565       reass = NULL;
 566       // if other worker created a context already work with the other copy
 567       if (-2 == rv)
 568         goto again;
 569     }
 570
 571   return reass;
 572 }
 573
 574 always_inline ip4_full_reass_rc_t
 575 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 576                          ip4_full_reass_main_t * rm,
 577                          ip4_full_reass_per_thread_t * rt,
 578                          ip4_full_reass_t * reass, u32 * bi0,
 579                          u32 * next0, u32 * error0, bool is_custom)
 580 {
 581   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 582   vlib_buffer_t *last_b = NULL;
 583   u32 sub_chain_bi = reass->first_bi;
 584   u32 total_length = 0;
 585   u32 buf_cnt = 0;
 586   do
 587     {
 588       u32 tmp_bi = sub_chain_bi;
 589       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 590       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 591       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 592       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 593           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 594         {
 595           return IP4_REASS_RC_INTERNAL_ERROR;
 596         }
 597
 598       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 599       u32 trim_front =
 600         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 601       u32 trim_end =
 602         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 603       if (tmp_bi == reass->first_bi)
 604         {
 605           /* first buffer - keep ip4 header */
 606           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 607             {
 608               return IP4_REASS_RC_INTERNAL_ERROR;
 609             }
 610           trim_front = 0;
 611           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 612             ip4_header_bytes (ip);
 613           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 614             {
 615               return IP4_REASS_RC_INTERNAL_ERROR;
 616             }
 617         }
 618       u32 keep_data =
 619         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 620       while (1)
 621         {
 622           ++buf_cnt;
 623           if (trim_front)
 624             {
 625               if (trim_front > tmp->current_length)
 626                 {
 627                   /* drop whole buffer */
 628                   u32 to_be_freed_bi = tmp_bi;
 629                   trim_front -= tmp->current_length;
 630                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 631                     {
 632                       return IP4_REASS_RC_INTERNAL_ERROR;
 633                     }
 634                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 635                   tmp_bi = tmp->next_buffer;
 636                   tmp->next_buffer = 0;
 637                   tmp = vlib_get_buffer (vm, tmp_bi);
 638                   vlib_buffer_free_one (vm, to_be_freed_bi);
 639                   continue;
 640                 }
 641               else
 642                 {
 643                   vlib_buffer_advance (tmp, trim_front);
 644                   trim_front = 0;
 645                 }
 646             }
 647           if (keep_data)
 648             {
 649               if (last_b)
 650                 {
 651                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 652                   last_b->next_buffer = tmp_bi;
 653                 }
 654               last_b = tmp;
 655               if (keep_data <= tmp->current_length)
 656                 {
 657                   tmp->current_length = keep_data;
 658                   keep_data = 0;
 659                 }
 660               else
 661                 {
 662                   keep_data -= tmp->current_length;
 663                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 664                     {
 665                       return IP4_REASS_RC_INTERNAL_ERROR;
 666                     }
 667                 }
 668               total_length += tmp->current_length;
 669               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 670                 {
 671                   tmp_bi = tmp->next_buffer;
 672                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 673                 }
 674               else
 675                 {
 676                   break;
 677                 }
 678             }
 679           else
 680             {
 681               u32 to_be_freed_bi = tmp_bi;
 682               if (reass->first_bi == tmp_bi)
 683                 {
 684                   return IP4_REASS_RC_INTERNAL_ERROR;
 685                 }
 686               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 687                 {
 688                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 689                   tmp_bi = tmp->next_buffer;
 690                   tmp->next_buffer = 0;
 691                   tmp = vlib_get_buffer (vm, tmp_bi);
 692                   vlib_buffer_free_one (vm, to_be_freed_bi);
 693                 }
 694               else
 695                 {
 696                   tmp->next_buffer = 0;
 697                   vlib_buffer_free_one (vm, to_be_freed_bi);
 698                   break;
 699                 }
 700             }
 701         }
 702       sub_chain_bi =
 703         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 704         reass.next_range_bi;
 705     }
 706   while (~0 != sub_chain_bi);
 707
 708   if (!last_b)
 709     {
 710       return IP4_REASS_RC_INTERNAL_ERROR;
 711     }
 712   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 713
 714   if (total_length < first_b->current_length)
 715     {
 716       return IP4_REASS_RC_INTERNAL_ERROR;
 717     }
 718   total_length -= first_b->current_length;
 719   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 720   first_b->total_length_not_including_first_buffer = total_length;
 721   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 722   ip->flags_and_fragment_offset = 0;
 723   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 724   ip->checksum = ip4_header_checksum (ip);
 725   if (!vlib_buffer_chain_linearize (vm, first_b))
 726     {
 727       return IP4_REASS_RC_NO_BUF;
 728     }
 729   // reset to reconstruct the mbuf linking
 730   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 731   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 732     {
 733       ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
 734                                 ~0);
 735 #if 0
 736       // following code does a hexdump of packet fragments to stdout ...
 737       do
 738         {
 739           u32 bi = reass->first_bi;
 740           u8 *s = NULL;
 741           while (~0 != bi)
 742             {
 743               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 744               s = format (s, "%u: %U\n", bi, format_hexdump,
 745                           vlib_buffer_get_current (b), b->current_length);
 746               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 747                 {
 748                   bi = b->next_buffer;
 749                 }
 750               else
 751                 {
 752                   break;
 753                 }
 754             }
 755           printf ("%.*s\n", vec_len (s), s);
 756           fflush (stdout);
 757           vec_free (s);
 758         }
 759       while (0);
 760 #endif
 761     }
 762   *bi0 = reass->first_bi;
 763   if (!is_custom)
 764     {
 765       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 766     }
 767   else
 768     {
 769       *next0 = reass->next_index;
 770     }
 771   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 772   *error0 = IP4_ERROR_NONE;
 773   ip4_full_reass_free (rm, rt, reass);
 774   reass = NULL;
 775   return IP4_REASS_RC_OK;
 776 }
 777
 778 always_inline ip4_full_reass_rc_t
 779 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 780                                       ip4_full_reass_t * reass,
 781                                       u32 prev_range_bi, u32 new_next_bi)
 782 {
 783   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 784   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 785   if (~0 != prev_range_bi)
 786     {
 787       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 788       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 789       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 790       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 791     }
 792   else
 793     {
 794       if (~0 != reass->first_bi)
 795         {
 796           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 797         }
 798       reass->first_bi = new_next_bi;
 799     }
 800   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 801   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 802       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 803     {
 804       return IP4_REASS_RC_INTERNAL_ERROR;
 805     }
 806   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 807   return IP4_REASS_RC_OK;
 808 }
 809
 810 always_inline ip4_full_reass_rc_t
 811 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 812                                         vlib_node_runtime_t * node,
 813                                         ip4_full_reass_t * reass,
 814                                         u32 prev_range_bi, u32 discard_bi)
 815 {
 816   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 817   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 818   if (~0 != prev_range_bi)
 819     {
 820       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 821       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 822       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 823         {
 824           return IP4_REASS_RC_INTERNAL_ERROR;
 825         }
 826       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 827     }
 828   else
 829     {
 830       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 831     }
 832   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 833   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 834       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 835     {
 836       return IP4_REASS_RC_INTERNAL_ERROR;
 837     }
 838   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 839   while (1)
 840     {
 841       u32 to_be_freed_bi = discard_bi;
 842       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 843         {
 844           ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
 845                                     0, ~0);
 846         }
 847       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 848         {
 849           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 850           discard_bi = discard_b->next_buffer;
 851           discard_b->next_buffer = 0;
 852           discard_b = vlib_get_buffer (vm, discard_bi);
 853           vlib_buffer_free_one (vm, to_be_freed_bi);
 854         }
 855       else
 856         {
 857           discard_b->next_buffer = 0;
 858           vlib_buffer_free_one (vm, to_be_freed_bi);
 859           break;
 860         }
 861     }
 862   return IP4_REASS_RC_OK;
 863 }
 864
 865 always_inline ip4_full_reass_rc_t
 866 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 867                        ip4_full_reass_main_t * rm,
 868                        ip4_full_reass_per_thread_t * rt,
 869                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 870                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 871 {
 872   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 873   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 874   if (is_custom)
 875     {
 876       // store (error_)next_index before it's overwritten
 877       reass->next_index = fvnb->ip.reass.next_index;
 878       reass->error_next_index = fvnb->ip.reass.error_next_index;
 879     }
 880   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 881   int consumed = 0;
 882   ip4_header_t *fip = vlib_buffer_get_current (fb);
 883   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 884   const u32 fragment_length =
 885     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 886   const u32 fragment_last = fragment_first + fragment_length - 1;
 887   fvnb->ip.reass.fragment_first = fragment_first;
 888   fvnb->ip.reass.fragment_last = fragment_last;
 889   int more_fragments = ip4_get_fragment_more (fip);
 890   u32 candidate_range_bi = reass->first_bi;
 891   u32 prev_range_bi = ~0;
 892   fvnb->ip.reass.range_first = fragment_first;
 893   fvnb->ip.reass.range_last = fragment_last;
 894   fvnb->ip.reass.next_range_bi = ~0;
 895   if (!more_fragments)
 896     {
 897       reass->last_packet_octet = fragment_last;
 898     }
 899   if (~0 == reass->first_bi)
 900     {
 901       // starting a new reassembly
 902       rc =
 903         ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 904       if (IP4_REASS_RC_OK != rc)
 905         {
 906           return rc;
 907         }
 908       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 909         {
 910           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
 911         }
 912       *bi0 = ~0;
 913       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 914       reass->fragments_n = 1;
 915       return IP4_REASS_RC_OK;
 916     }
 917   reass->min_fragment_length =
 918     clib_min (clib_net_to_host_u16 (fip->length),
 919               fvnb->ip.reass.estimated_mtu);
 920   while (~0 != candidate_range_bi)
 921     {
 922       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 923       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 924       if (fragment_first > candidate_vnb->ip.reass.range_last)
 925         {
 926           // this fragments starts after candidate range
 927           prev_range_bi = candidate_range_bi;
 928           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 929           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 930               ~0 == candidate_range_bi)
 931             {
 932               // special case - this fragment falls beyond all known ranges
 933               rc = ip4_full_reass_insert_range_in_chain (vm, reass,
 934                                                          prev_range_bi, *bi0);
 935               if (IP4_REASS_RC_OK != rc)
 936                 {
 937                   return rc;
 938                 }
 939               consumed = 1;
 940               break;
 941             }
 942           continue;
 943         }
 944       if (fragment_last < candidate_vnb->ip.reass.range_first)
 945         {
 946           // this fragment ends before candidate range without any overlap
 947           rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
 948                                                      *bi0);
 949           if (IP4_REASS_RC_OK != rc)
 950             {
 951               return rc;
 952             }
 953           consumed = 1;
 954         }
 955       else
 956         {
 957           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
 958               fragment_last <= candidate_vnb->ip.reass.range_last)
 959             {
 960               // this fragment is a (sub)part of existing range, ignore it
 961               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 962                 {
 963                   ip4_full_reass_add_trace (vm, node, reass, *bi0,
 964                                             RANGE_OVERLAP, 0, ~0);
 965                 }
 966               break;
 967             }
 968           int discard_candidate = 0;
 969           if (fragment_first < candidate_vnb->ip.reass.range_first)
 970             {
 971               u32 overlap =
 972                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
 973               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 974                 {
 975                   candidate_vnb->ip.reass.range_first += overlap;
 976                   if (reass->data_len < overlap)
 977                     {
 978                       return IP4_REASS_RC_INTERNAL_ERROR;
 979                     }
 980                   reass->data_len -= overlap;
 981                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 982                     {
 983                       ip4_full_reass_add_trace (vm, node, reass,
 984                                                 candidate_range_bi,
 985                                                 RANGE_SHRINK, 0, ~0);
 986                     }
 987                   rc = ip4_full_reass_insert_range_in_chain (
 988                     vm, reass, prev_range_bi, *bi0);
 989                   if (IP4_REASS_RC_OK != rc)
 990                     {
 991                       return rc;
 992                     }
 993                   consumed = 1;
 994                 }
 995               else
 996                 {
 997                   discard_candidate = 1;
 998                 }
 999             }
1000           else if (fragment_last > candidate_vnb->ip.reass.range_last)
1001             {
1002               u32 overlap =
1003                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1004               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1005                 {
1006                   fvnb->ip.reass.range_first += overlap;
1007                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1008                     {
1009                       prev_range_bi = candidate_range_bi;
1010                       candidate_range_bi =
1011                         candidate_vnb->ip.reass.next_range_bi;
1012                       continue;
1013                     }
1014                   else
1015                     {
1016                       // special case - last range discarded
1017                       rc = ip4_full_reass_insert_range_in_chain (
1018                         vm, reass, candidate_range_bi, *bi0);
1019                       if (IP4_REASS_RC_OK != rc)
1020                         {
1021                           return rc;
1022                         }
1023                       consumed = 1;
1024                     }
1025                 }
1026               else
1027                 {
1028                   discard_candidate = 1;
1029                 }
1030             }
1031           else
1032             {
1033               discard_candidate = 1;
1034             }
1035           if (discard_candidate)
1036             {
1037               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1038               // discard candidate range, probe next range
1039               rc = ip4_full_reass_remove_range_from_chain (
1040                 vm, node, reass, prev_range_bi, candidate_range_bi);
1041               if (IP4_REASS_RC_OK != rc)
1042                 {
1043                   return rc;
1044                 }
1045               if (~0 != next_range_bi)
1046                 {
1047                   candidate_range_bi = next_range_bi;
1048                   continue;
1049                 }
1050               else
1051                 {
1052                   // special case - last range discarded
1053                   rc = ip4_full_reass_insert_range_in_chain (
1054                     vm, reass, prev_range_bi, *bi0);
1055                   if (IP4_REASS_RC_OK != rc)
1056                     {
1057                       return rc;
1058                     }
1059                   consumed = 1;
1060                 }
1061             }
1062         }
1063       break;
1064     }
1065   ++reass->fragments_n;
1066   if (consumed)
1067     {
1068       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1069         {
1070           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1071         }
1072     }
1073   if (~0 != reass->last_packet_octet &&
1074       reass->data_len == reass->last_packet_octet + 1)
1075     {
1076       *handoff_thread_idx = reass->sendout_thread_index;
1077       int handoff =
1078         reass->memory_owner_thread_index != reass->sendout_thread_index;
1079       rc =
1080         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1081                                  is_custom);
1082       if (IP4_REASS_RC_OK == rc && handoff)
1083         {
1084           rc = IP4_REASS_RC_HANDOFF;
1085         }
1086     }
1087   else
1088     {
1089       if (consumed)
1090         {
1091           *bi0 = ~0;
1092           if (reass->fragments_n > rm->max_reass_len)
1093             {
1094               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1095             }
1096         }
1097       else
1098         {
1099           *next0 = IP4_FULL_REASS_NEXT_DROP;
1100           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1101         }
1102     }
1103   return rc;
1104 }
1105
1106 always_inline uword
1107 ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1108                        vlib_frame_t *frame, ip4_full_reass_node_type_t type,
1109                        bool is_local)
1110 {
1111   u32 *from = vlib_frame_vector_args (frame);
1112   u32 n_left_from, n_left_to_next, *to_next, next_index;
1113   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1114   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1115   clib_spinlock_lock (&rt->lock);
1116
1117   n_left_from = frame->n_vectors;
1118   next_index = node->cached_next_index;
1119   while (n_left_from > 0)
1120     {
1121       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1122
1123       while (n_left_from > 0 && n_left_to_next > 0)
1124         {
1125           u32 bi0;
1126           vlib_buffer_t *b0;
1127           u32 next0;
1128           u32 error0 = IP4_ERROR_NONE;
1129
1130           bi0 = from[0];
1131           b0 = vlib_get_buffer (vm, bi0);
1132
1133           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1134           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1135             {
1136               // this is a whole packet - no fragmentation
1137               if (CUSTOM != type)
1138                 {
1139                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1140                 }
1141               else
1142                 {
1143                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1144                 }
1145               ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
1146                                         ~0);
1147               goto packet_enqueue;
1148             }
1149
1150           if (is_local && !rm->is_local_reass_enabled)
1151             {
1152               next0 = IP4_FULL_REASS_NEXT_DROP;
1153               goto packet_enqueue;
1154             }
1155
1156           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1157           const u32 fragment_length =
1158             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1159           const u32 fragment_last = fragment_first + fragment_length - 1;
1160           if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0)))     // 8 is minimum frag length per RFC 791
1161             {
1162               next0 = IP4_FULL_REASS_NEXT_DROP;
1163               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1164               goto packet_enqueue;
1165             }
1166           ip4_full_reass_kv_t kv;
1167           u8 do_handoff = 0;
1168
1169           kv.k.as_u64[0] =
1170             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1171                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1172             (u64) ip0->src_address.as_u32 << 32;
1173           kv.k.as_u64[1] =
1174             (u64) ip0->dst_address.
1175             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1176
1177           ip4_full_reass_t *reass =
1178             ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1179                                            &do_handoff);
1180
1181           if (reass)
1182             {
1183               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1184               if (0 == fragment_first)
1185                 {
1186                   reass->sendout_thread_index = vm->thread_index;
1187                 }
1188             }
1189
1190           if (PREDICT_FALSE (do_handoff))
1191             {
1192               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1193               vnet_buffer (b0)->ip.reass.owner_thread_index =
1194                 kv.v.memory_owner_thread_index;
1195             }
1196           else if (reass)
1197             {
1198               u32 handoff_thread_idx;
1199               u32 counter = ~0;
1200               switch (ip4_full_reass_update
1201                       (vm, node, rm, rt, reass, &bi0, &next0,
1202                        &error0, CUSTOM == type, &handoff_thread_idx))
1203                 {
1204                 case IP4_REASS_RC_OK:
1205                   /* nothing to do here */
1206                   break;
1207                 case IP4_REASS_RC_HANDOFF:
1208                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1209                   b0 = vlib_get_buffer (vm, bi0);
1210                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1211                     handoff_thread_idx;
1212                   break;
1213                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1214                   counter = IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1215                   break;
1216                 case IP4_REASS_RC_NO_BUF:
1217                   counter = IP4_ERROR_REASS_NO_BUF;
1218                   break;
1219                 case IP4_REASS_RC_INTERNAL_ERROR:
1220                   counter = IP4_ERROR_REASS_INTERNAL_ERROR;
1221                   break;
1222                 }
1223
1224               if (~0 != counter)
1225                 {
1226                   vlib_node_increment_counter (vm, node->node_index, counter,
1227                                                1);
1228                   ip4_full_reass_drop_all (vm, node, reass, bi0);
1229                   ip4_full_reass_free (rm, rt, reass);
1230                   goto next_packet;
1231                 }
1232             }
1233           else
1234             {
1235               next0 = IP4_FULL_REASS_NEXT_DROP;
1236               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1237             }
1238
1239
1240         packet_enqueue:
1241
1242           if (bi0 != ~0)
1243             {
1244               to_next[0] = bi0;
1245               to_next += 1;
1246               n_left_to_next -= 1;
1247
1248               /* bi0 might have been updated by reass_finalize, reload */
1249               b0 = vlib_get_buffer (vm, bi0);
1250               if (IP4_ERROR_NONE != error0)
1251                 {
1252                   b0->error = node->errors[error0];
1253                 }
1254
1255               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1256                 {
1257                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1258                     {
1259                       ip4_full_reass_add_trace (
1260                         vm, node, NULL, bi0, HANDOFF, 0,
1261                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1262                     }
1263                 }
1264               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1265                 {
1266                   vnet_feature_next (&next0, b0);
1267                 }
1268               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1269                                                to_next, n_left_to_next,
1270                                                bi0, next0);
1271               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1272             }
1273
1274         next_packet:
1275           from += 1;
1276           n_left_from -= 1;
1277         }
1278
1279       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1280     }
1281
1282   clib_spinlock_unlock (&rt->lock);
1283   return frame->n_vectors;
1284 }
1285
1286 static char *ip4_full_reass_error_strings[] = {
1287 #define _(sym, string) string,
1288   foreach_ip4_error
1289 #undef _
1290 };
1291
1292 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1293                                     vlib_node_runtime_t * node,
1294                                     vlib_frame_t * frame)
1295 {
1296   return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
1297 }
1298
1299 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1300     .name = "ip4-full-reassembly",
1301     .vector_size = sizeof (u32),
1302     .format_trace = format_ip4_full_reass_trace,
1303     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1304     .error_strings = ip4_full_reass_error_strings,
1305     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1306     .next_nodes =
1307         {
1308                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1309                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1310                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1311
1312         },
1313 };
1314
1315 VLIB_NODE_FN (ip4_local_full_reass_node)
1316 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1317 {
1318   return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
1319 }
1320
1321 VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
1322     .name = "ip4-local-full-reassembly",
1323     .vector_size = sizeof (u32),
1324     .format_trace = format_ip4_full_reass_trace,
1325     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1326     .error_strings = ip4_full_reass_error_strings,
1327     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1328     .next_nodes =
1329         {
1330                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1331                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1332                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
1333
1334         },
1335 };
1336
1337 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1338                                             vlib_node_runtime_t * node,
1339                                             vlib_frame_t * frame)
1340 {
1341   return ip4_full_reass_inline (vm, node, frame, FEATURE,
1342                                 false /* is_local */);
1343 }
1344
1345 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1346     .name = "ip4-full-reassembly-feature",
1347     .vector_size = sizeof (u32),
1348     .format_trace = format_ip4_full_reass_trace,
1349     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1350     .error_strings = ip4_full_reass_error_strings,
1351     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1352     .next_nodes =
1353         {
1354                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1355                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1356                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1357         },
1358 };
1359
1360 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1361     .arc_name = "ip4-unicast",
1362     .node_name = "ip4-full-reassembly-feature",
1363     .runs_before = VNET_FEATURES ("ip4-lookup",
1364                                   "ipsec4-input-feature"),
1365     .runs_after = 0,
1366 };
1367
1368 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1369                                            vlib_node_runtime_t * node,
1370                                            vlib_frame_t * frame)
1371 {
1372   return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
1373 }
1374
1375 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1376     .name = "ip4-full-reassembly-custom",
1377     .vector_size = sizeof (u32),
1378     .format_trace = format_ip4_full_reass_trace,
1379     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1380     .error_strings = ip4_full_reass_error_strings,
1381     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1382     .next_nodes =
1383         {
1384                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1385                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1386                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1387         },
1388 };
1389
1390 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1391     .arc_name = "ip4-unicast",
1392     .node_name = "ip4-full-reassembly-feature",
1393     .runs_before = VNET_FEATURES ("ip4-lookup",
1394                                   "ipsec4-input-feature"),
1395     .runs_after = 0,
1396 };
1397
1398
1399 #ifndef CLIB_MARCH_VARIANT
1400 uword
1401 ip4_full_reass_custom_register_next_node (uword node_index)
1402 {
1403   return vlib_node_add_next (vlib_get_main (),
1404                              ip4_full_reass_node_custom.index, node_index);
1405 }
1406
1407 always_inline u32
1408 ip4_full_reass_get_nbuckets ()
1409 {
1410   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1411   u32 nbuckets;
1412   u8 i;
1413
1414   nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1415
1416   for (i = 0; i < 31; i++)
1417     if ((1 << i) >= nbuckets)
1418       break;
1419   nbuckets = 1 << i;
1420
1421   return nbuckets;
1422 }
1423 #endif /* CLIB_MARCH_VARIANT */
1424
1425 typedef enum
1426 {
1427   IP4_EVENT_CONFIG_CHANGED = 1,
1428 } ip4_full_reass_event_t;
1429
1430 typedef struct
1431 {
1432   int failure;
1433   clib_bihash_16_8_t *new_hash;
1434 } ip4_rehash_cb_ctx;
1435
1436 #ifndef CLIB_MARCH_VARIANT
1437 static int
1438 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1439 {
1440   ip4_rehash_cb_ctx *ctx = _ctx;
1441   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1442     {
1443       ctx->failure = 1;
1444     }
1445   return (BIHASH_WALK_CONTINUE);
1446 }
1447
1448 static void
1449 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1450                            u32 max_reassembly_length,
1451                            u32 expire_walk_interval_ms)
1452 {
1453   ip4_full_reass_main.timeout_ms = timeout_ms;
1454   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1455   ip4_full_reass_main.max_reass_n = max_reassemblies;
1456   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1457   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1458 }
1459
1460 vnet_api_error_t
1461 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1462                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1463 {
1464   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1465   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1466                              max_reassembly_length, expire_walk_interval_ms);
1467   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1468                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1469                              IP4_EVENT_CONFIG_CHANGED, 0);
1470   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1471   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1472     {
1473       clib_bihash_16_8_t new_hash;
1474       clib_memset (&new_hash, 0, sizeof (new_hash));
1475       ip4_rehash_cb_ctx ctx;
1476       ctx.failure = 0;
1477       ctx.new_hash = &new_hash;
1478       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1479                              new_nbuckets * 1024);
1480       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1481                                                ip4_rehash_cb, &ctx);
1482       if (ctx.failure)
1483         {
1484           clib_bihash_free_16_8 (&new_hash);
1485           return -1;
1486         }
1487       else
1488         {
1489           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1490           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1491                             sizeof (ip4_full_reass_main.hash));
1492           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1493         }
1494     }
1495   return 0;
1496 }
1497
1498 vnet_api_error_t
1499 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1500                     u32 * max_reassembly_length,
1501                     u32 * expire_walk_interval_ms)
1502 {
1503   *timeout_ms = ip4_full_reass_main.timeout_ms;
1504   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1505   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1506   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1507   return 0;
1508 }
1509
1510 static clib_error_t *
1511 ip4_full_reass_init_function (vlib_main_t * vm)
1512 {
1513   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1514   clib_error_t *error = 0;
1515   u32 nbuckets;
1516   vlib_node_t *node;
1517
1518   rm->vlib_main = vm;
1519
1520   vec_validate (rm->per_thread_data, vlib_num_workers ());
1521   ip4_full_reass_per_thread_t *rt;
1522   vec_foreach (rt, rm->per_thread_data)
1523   {
1524     clib_spinlock_init (&rt->lock);
1525     pool_alloc (rt->pool, rm->max_reass_n);
1526   }
1527
1528   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1529   ASSERT (node);
1530   rm->ip4_full_reass_expire_node_idx = node->index;
1531
1532   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1533                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1534                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1535                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1536
1537   nbuckets = ip4_full_reass_get_nbuckets ();
1538   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1539
1540   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1541   rm->fq_local_index =
1542     vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
1543   rm->fq_feature_index =
1544     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1545   rm->fq_custom_index =
1546     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1547
1548   rm->feature_use_refcount_per_intf = NULL;
1549   rm->is_local_reass_enabled = 1;
1550
1551   return error;
1552 }
1553
1554 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1555 #endif /* CLIB_MARCH_VARIANT */
1556
1557 static uword
1558 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1559                              CLIB_UNUSED (vlib_frame_t *f))
1560 {
1561   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1562   uword event_type, *event_data = 0;
1563
1564   while (true)
1565     {
1566       vlib_process_wait_for_event_or_clock (vm,
1567                                             (f64)
1568                                             rm->expire_walk_interval_ms /
1569                                             (f64) MSEC_PER_SEC);
1570       event_type = vlib_process_get_events (vm, &event_data);
1571
1572       switch (event_type)
1573         {
1574         case ~0:
1575           /* no events => timeout */
1576           /* fallthrough */
1577         case IP4_EVENT_CONFIG_CHANGED:
1578           /* nothing to do here */
1579           break;
1580         default:
1581           clib_warning ("BUG: event type 0x%wx", event_type);
1582           break;
1583         }
1584       f64 now = vlib_time_now (vm);
1585
1586       ip4_full_reass_t *reass;
1587       int *pool_indexes_to_free = NULL;
1588
1589       uword thread_index = 0;
1590       int index;
1591       const uword nthreads = vlib_num_workers () + 1;
1592       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1593         {
1594           ip4_full_reass_per_thread_t *rt =
1595             &rm->per_thread_data[thread_index];
1596           clib_spinlock_lock (&rt->lock);
1597
1598           vec_reset_length (pool_indexes_to_free);
1599           pool_foreach_index (index, rt->pool)  {
1600                                 reass = pool_elt_at_index (rt->pool, index);
1601                                 if (now > reass->last_heard + rm->timeout)
1602                                   {
1603                                     vec_add1 (pool_indexes_to_free, index);
1604                                   }
1605                               }
1606           int *i;
1607           vec_foreach (i, pool_indexes_to_free)
1608           {
1609             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1610             ip4_full_reass_drop_all (vm, node, reass, ~0);
1611             ip4_full_reass_free (rm, rt, reass);
1612           }
1613
1614           clib_spinlock_unlock (&rt->lock);
1615         }
1616
1617       vec_free (pool_indexes_to_free);
1618       if (event_data)
1619         {
1620           vec_set_len (event_data, 0);
1621         }
1622     }
1623
1624   return 0;
1625 }
1626
1627 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1628     .function = ip4_full_reass_walk_expired,
1629     .type = VLIB_NODE_TYPE_PROCESS,
1630     .name = "ip4-full-reassembly-expire-walk",
1631     .format_trace = format_ip4_full_reass_trace,
1632     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1633     .error_strings = ip4_full_reass_error_strings,
1634
1635 };
1636
1637 static u8 *
1638 format_ip4_full_reass_key (u8 * s, va_list * args)
1639 {
1640   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1641   s =
1642     format (s,
1643             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1644             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1645             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1646   return s;
1647 }
1648
1649 static u8 *
1650 format_ip4_reass (u8 * s, va_list * args)
1651 {
1652   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1653   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1654
1655   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1656               "last_packet_octet: %u, trace_op_counter: %u\n",
1657               reass->id, format_ip4_full_reass_key, &reass->key,
1658               reass->first_bi, reass->data_len,
1659               reass->last_packet_octet, reass->trace_op_counter);
1660
1661   u32 bi = reass->first_bi;
1662   u32 counter = 0;
1663   while (~0 != bi)
1664     {
1665       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1666       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1667       s =
1668         format (s,
1669                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1670                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1671                 vnb->ip.reass.range_last, bi,
1672                 ip4_full_reass_buffer_get_data_offset (b),
1673                 ip4_full_reass_buffer_get_data_len (b),
1674                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1675       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1676         {
1677           bi = b->next_buffer;
1678         }
1679       else
1680         {
1681           bi = ~0;
1682         }
1683     }
1684   return s;
1685 }
1686
1687 static clib_error_t *
1688 show_ip4_reass (vlib_main_t * vm,
1689                 unformat_input_t * input,
1690                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1691 {
1692   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1693
1694   vlib_cli_output (vm, "---------------------");
1695   vlib_cli_output (vm, "IP4 reassembly status");
1696   vlib_cli_output (vm, "---------------------");
1697   bool details = false;
1698   if (unformat (input, "details"))
1699     {
1700       details = true;
1701     }
1702
1703   u32 sum_reass_n = 0;
1704   ip4_full_reass_t *reass;
1705   uword thread_index;
1706   const uword nthreads = vlib_num_workers () + 1;
1707   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1708     {
1709       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1710       clib_spinlock_lock (&rt->lock);
1711       if (details)
1712         {
1713           pool_foreach (reass, rt->pool) {
1714             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1715           }
1716         }
1717       sum_reass_n += rt->reass_n;
1718       clib_spinlock_unlock (&rt->lock);
1719     }
1720   vlib_cli_output (vm, "---------------------");
1721   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1722                    (long unsigned) sum_reass_n);
1723   vlib_cli_output (vm,
1724                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1725                    (long unsigned) rm->max_reass_n);
1726   vlib_cli_output (vm,
1727                    "Maximum configured amount of fragments "
1728                    "per full IP4 reassembly: %lu\n",
1729                    (long unsigned) rm->max_reass_len);
1730   vlib_cli_output (vm,
1731                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1732                    (long unsigned) rm->timeout_ms);
1733   vlib_cli_output (vm,
1734                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1735                    (long unsigned) rm->expire_walk_interval_ms);
1736   return 0;
1737 }
1738
1739 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1740     .path = "show ip4-full-reassembly",
1741     .short_help = "show ip4-full-reassembly [details]",
1742     .function = show_ip4_reass,
1743 };
1744
1745 #ifndef CLIB_MARCH_VARIANT
1746 vnet_api_error_t
1747 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1748 {
1749   return vnet_feature_enable_disable ("ip4-unicast",
1750                                       "ip4-full-reassembly-feature",
1751                                       sw_if_index, enable_disable, 0, 0);
1752 }
1753 #endif /* CLIB_MARCH_VARIANT */
1754
1755
1756 #define foreach_ip4_full_reass_handoff_error                       \
1757 _(CONGESTION_DROP, "congestion drop")
1758
1759
1760 typedef enum
1761 {
1762 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1763   foreach_ip4_full_reass_handoff_error
1764 #undef _
1765     IP4_FULL_REASS_HANDOFF_N_ERROR,
1766 } ip4_full_reass_handoff_error_t;
1767
1768 static char *ip4_full_reass_handoff_error_strings[] = {
1769 #define _(sym,string) string,
1770   foreach_ip4_full_reass_handoff_error
1771 #undef _
1772 };
1773
1774 typedef struct
1775 {
1776   u32 next_worker_index;
1777 } ip4_full_reass_handoff_trace_t;
1778
1779 static u8 *
1780 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1781 {
1782   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1783   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1784   ip4_full_reass_handoff_trace_t *t =
1785     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1786
1787   s =
1788     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1789             t->next_worker_index);
1790
1791   return s;
1792 }
1793
1794 always_inline uword
1795 ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1796                                     vlib_frame_t *frame,
1797                                     ip4_full_reass_node_type_t type,
1798                                     bool is_local)
1799 {
1800   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1801
1802   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1803   u32 n_enq, n_left_from, *from;
1804   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1805   u32 fq_index;
1806
1807   from = vlib_frame_vector_args (frame);
1808   n_left_from = frame->n_vectors;
1809   vlib_get_buffers (vm, from, bufs, n_left_from);
1810
1811   b = bufs;
1812   ti = thread_indices;
1813
1814   switch (type)
1815     {
1816     case NORMAL:
1817       if (is_local)
1818         {
1819           fq_index = rm->fq_local_index;
1820         }
1821       else
1822         {
1823           fq_index = rm->fq_index;
1824         }
1825       break;
1826     case FEATURE:
1827       fq_index = rm->fq_feature_index;
1828       break;
1829     case CUSTOM:
1830       fq_index = rm->fq_custom_index;
1831       break;
1832     default:
1833       clib_warning ("Unexpected `type' (%d)!", type);
1834     }
1835
1836   while (n_left_from > 0)
1837     {
1838       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1839
1840       if (PREDICT_FALSE
1841           ((node->flags & VLIB_NODE_FLAG_TRACE)
1842            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1843         {
1844           ip4_full_reass_handoff_trace_t *t =
1845             vlib_add_trace (vm, node, b[0], sizeof (*t));
1846           t->next_worker_index = ti[0];
1847         }
1848
1849       n_left_from -= 1;
1850       ti += 1;
1851       b += 1;
1852     }
1853   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1854                                          thread_indices, frame->n_vectors, 1);
1855
1856   if (n_enq < frame->n_vectors)
1857     vlib_node_increment_counter (vm, node->node_index,
1858                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1859                                  frame->n_vectors - n_enq);
1860   return frame->n_vectors;
1861 }
1862
1863 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1864                                             vlib_node_runtime_t * node,
1865                                             vlib_frame_t * frame)
1866 {
1867   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1868                                              false /* is_local */);
1869 }
1870
1871
1872 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1873   .name = "ip4-full-reassembly-handoff",
1874   .vector_size = sizeof (u32),
1875   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1876   .error_strings = ip4_full_reass_handoff_error_strings,
1877   .format_trace = format_ip4_full_reass_handoff_trace,
1878
1879   .n_next_nodes = 1,
1880
1881   .next_nodes = {
1882     [0] = "error-drop",
1883   },
1884 };
1885
1886 VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
1887 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1888 {
1889   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1890                                              true /* is_local */);
1891 }
1892
1893 VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
1894   .name = "ip4-local-full-reassembly-handoff",
1895   .vector_size = sizeof (u32),
1896   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1897   .error_strings = ip4_full_reass_handoff_error_strings,
1898   .format_trace = format_ip4_full_reass_handoff_trace,
1899
1900   .n_next_nodes = 1,
1901
1902   .next_nodes = {
1903     [0] = "error-drop",
1904   },
1905 };
1906
1907 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1908                                                     vlib_node_runtime_t *
1909                                                     node,
1910                                                     vlib_frame_t * frame)
1911 {
1912   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
1913                                              false /* is_local */);
1914 }
1915
1916 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1917   .name = "ip4-full-reass-feature-hoff",
1918   .vector_size = sizeof (u32),
1919   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1920   .error_strings = ip4_full_reass_handoff_error_strings,
1921   .format_trace = format_ip4_full_reass_handoff_trace,
1922
1923   .n_next_nodes = 1,
1924
1925   .next_nodes = {
1926     [0] = "error-drop",
1927   },
1928 };
1929
1930 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1931                                                     vlib_node_runtime_t *
1932                                                     node,
1933                                                     vlib_frame_t * frame)
1934 {
1935   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
1936                                              false /* is_local */);
1937 }
1938
1939 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1940   .name = "ip4-full-reass-custom-hoff",
1941   .vector_size = sizeof (u32),
1942   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1943   .error_strings = ip4_full_reass_handoff_error_strings,
1944   .format_trace = format_ip4_full_reass_handoff_trace,
1945
1946   .n_next_nodes = 1,
1947
1948   .next_nodes = {
1949     [0] = "error-drop",
1950   },
1951 };
1952
1953 #ifndef CLIB_MARCH_VARIANT
1954 int
1955 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1956 {
1957   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1958   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1959   if (is_enable)
1960     {
1961       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1962         {
1963           ++rm->feature_use_refcount_per_intf[sw_if_index];
1964           return vnet_feature_enable_disable ("ip4-unicast",
1965                                               "ip4-full-reassembly-feature",
1966                                               sw_if_index, 1, 0, 0);
1967         }
1968       ++rm->feature_use_refcount_per_intf[sw_if_index];
1969     }
1970   else
1971     {
1972       --rm->feature_use_refcount_per_intf[sw_if_index];
1973       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1974         return vnet_feature_enable_disable ("ip4-unicast",
1975                                             "ip4-full-reassembly-feature",
1976                                             sw_if_index, 0, 0, 0);
1977     }
1978   return -1;
1979 }
1980
1981 void
1982 ip4_local_full_reass_enable_disable (int enable)
1983 {
1984   if (enable)
1985     {
1986       ip4_full_reass_main.is_local_reass_enabled = 1;
1987     }
1988   else
1989     {
1990       ip4_full_reass_main.is_local_reass_enabled = 0;
1991     }
1992 }
1993
1994 int
1995 ip4_local_full_reass_enabled ()
1996 {
1997   return ip4_full_reass_main.is_local_reass_enabled;
1998 }
1999
2000 #endif
2001
2002 /*
2003  * fd.io coding-style-patch-verification: ON
2004  *
2005  * Local Variables:
2006  * eval: (c-set-style "gnu")
2007  * End:
2008  */