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   // node index of ip4-drop node
 181   u32 ip4_drop_idx;
 182   u32 ip4_full_reass_expire_node_idx;
 183
 184   /** Worker handoff */
 185   u32 fq_index;
 186   u32 fq_feature_index;
 187   u32 fq_custom_index;
 188
 189   // reference count for enabling/disabling feature - per interface
 190   u32 *feature_use_refcount_per_intf;
 191 } ip4_full_reass_main_t;
 192
 193 extern ip4_full_reass_main_t ip4_full_reass_main;
 194
 195 #ifndef CLIB_MARCH_VARIANT
 196 ip4_full_reass_main_t ip4_full_reass_main;
 197 #endif /* CLIB_MARCH_VARIANT */
 198
 199 typedef enum
 200 {
 201   IP4_FULL_REASS_NEXT_INPUT,
 202   IP4_FULL_REASS_NEXT_DROP,
 203   IP4_FULL_REASS_NEXT_HANDOFF,
 204   IP4_FULL_REASS_N_NEXT,
 205 } ip4_full_reass_next_t;
 206
 207 typedef enum
 208 {
 209   NORMAL,
 210   FEATURE,
 211   CUSTOM
 212 } ip4_full_reass_node_type_t;
 213
 214 typedef enum
 215 {
 216   RANGE_NEW,
 217   RANGE_SHRINK,
 218   RANGE_DISCARD,
 219   RANGE_OVERLAP,
 220   FINALIZE,
 221   HANDOFF,
 222 } ip4_full_reass_trace_operation_e;
 223
 224 typedef struct
 225 {
 226   u16 range_first;
 227   u16 range_last;
 228   u32 range_bi;
 229   i32 data_offset;
 230   u32 data_len;
 231   u32 first_bi;
 232 } ip4_full_reass_range_trace_t;
 233
 234 typedef struct
 235 {
 236   ip4_full_reass_trace_operation_e action;
 237   u32 reass_id;
 238   ip4_full_reass_range_trace_t trace_range;
 239   u32 size_diff;
 240   u32 op_id;
 241   u32 thread_id;
 242   u32 thread_id_to;
 243   u32 fragment_first;
 244   u32 fragment_last;
 245   u32 total_data_len;
 246   bool is_after_handoff;
 247   ip4_header_t ip4_header;
 248 } ip4_full_reass_trace_t;
 249
 250 extern vlib_node_registration_t ip4_full_reass_node;
 251 extern vlib_node_registration_t ip4_full_reass_node_feature;
 252 extern vlib_node_registration_t ip4_full_reass_node_custom;
 253
 254 static void
 255 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 256                               ip4_full_reass_range_trace_t * trace)
 257 {
 258   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 259   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 260   trace->range_first = vnb->ip.reass.range_first;
 261   trace->range_last = vnb->ip.reass.range_last;
 262   trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
 263   trace->data_len = ip4_full_reass_buffer_get_data_len (b);
 264   trace->range_bi = bi;
 265 }
 266
 267 static u8 *
 268 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
 269 {
 270   ip4_full_reass_range_trace_t *trace =
 271     va_arg (*args, ip4_full_reass_range_trace_t *);
 272   s =
 273     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 274             trace->range_last, trace->data_offset, trace->data_len,
 275             trace->range_bi);
 276   return s;
 277 }
 278
 279 static u8 *
 280 format_ip4_full_reass_trace (u8 * s, va_list * args)
 281 {
 282   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 283   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 284   ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
 285   u32 indent = 0;
 286   if (~0 != t->reass_id)
 287     {
 288       if (t->is_after_handoff)
 289         {
 290           s =
 291             format (s, "%U\n", format_ip4_header, &t->ip4_header,
 292                     sizeof (t->ip4_header));
 293           indent = 2;
 294         }
 295       s =
 296         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 297                 t->reass_id, t->op_id);
 298       indent = format_get_indent (s);
 299       s =
 300         format (s,
 301                 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 302                 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 303                 t->fragment_last);
 304     }
 305   switch (t->action)
 306     {
 307     case RANGE_SHRINK:
 308       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 309                   format_ip4_full_reass_range_trace, &t->trace_range,
 310                   t->size_diff);
 311       break;
 312     case RANGE_DISCARD:
 313       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 314                   format_ip4_full_reass_range_trace, &t->trace_range);
 315       break;
 316     case RANGE_NEW:
 317       s = format (s, "\n%Unew %U", format_white_space, indent,
 318                   format_ip4_full_reass_range_trace, &t->trace_range);
 319       break;
 320     case RANGE_OVERLAP:
 321       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 322                   format_ip4_full_reass_range_trace, &t->trace_range);
 323       break;
 324     case FINALIZE:
 325       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 326       break;
 327     case HANDOFF:
 328       s =
 329         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 330                 t->thread_id_to);
 331       break;
 332     }
 333   return s;
 334 }
 335
 336 static void
 337 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 338                           ip4_full_reass_main_t * rm,
 339                           ip4_full_reass_t * reass, u32 bi,
 340                           ip4_full_reass_trace_operation_e action,
 341                           u32 size_diff, u32 thread_id_to)
 342 {
 343   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 344   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 345   bool is_after_handoff = false;
 346   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 347     {
 348       is_after_handoff = true;
 349     }
 350   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 351   t->is_after_handoff = is_after_handoff;
 352   if (t->is_after_handoff)
 353     {
 354       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 355                    clib_min (sizeof (t->ip4_header), b->current_length));
 356     }
 357   if (reass)
 358     {
 359       t->reass_id = reass->id;
 360       t->op_id = reass->trace_op_counter;
 361       t->trace_range.first_bi = reass->first_bi;
 362       t->total_data_len = reass->data_len;
 363       ++reass->trace_op_counter;
 364     }
 365   else
 366     {
 367       t->reass_id = ~0;
 368       t->op_id = 0;
 369       t->trace_range.first_bi = 0;
 370       t->total_data_len = 0;
 371     }
 372   t->action = action;
 373   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 374   t->size_diff = size_diff;
 375   t->thread_id = vm->thread_index;
 376   t->thread_id_to = thread_id_to;
 377   t->fragment_first = vnb->ip.reass.fragment_first;
 378   t->fragment_last = vnb->ip.reass.fragment_last;
 379 #if 0
 380   static u8 *s = NULL;
 381   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 382   printf ("%.*s\n", vec_len (s), s);
 383   fflush (stdout);
 384   vec_reset_length (s);
 385 #endif
 386 }
 387
 388 always_inline void
 389 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 390                          ip4_full_reass_t * reass)
 391 {
 392   pool_put (rt->pool, reass);
 393   --rt->reass_n;
 394 }
 395
 396 always_inline void
 397 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 398                      ip4_full_reass_per_thread_t * rt,
 399                      ip4_full_reass_t * reass)
 400 {
 401   clib_bihash_kv_16_8_t kv;
 402   kv.key[0] = reass->key.as_u64[0];
 403   kv.key[1] = reass->key.as_u64[1];
 404   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 405   return ip4_full_reass_free_ctx (rt, reass);
 406 }
 407
 408 always_inline void
 409 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 410                          ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
 411 {
 412   u32 range_bi = reass->first_bi;
 413   vlib_buffer_t *range_b;
 414   vnet_buffer_opaque_t *range_vnb;
 415   u32 *to_free = NULL;
 416   while (~0 != range_bi)
 417     {
 418       range_b = vlib_get_buffer (vm, range_bi);
 419       range_vnb = vnet_buffer (range_b);
 420       u32 bi = range_bi;
 421       while (~0 != bi)
 422         {
 423           vec_add1 (to_free, bi);
 424           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 425           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 426             {
 427               bi = b->next_buffer;
 428               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 429             }
 430           else
 431             {
 432               bi = ~0;
 433             }
 434         }
 435       range_bi = range_vnb->ip.reass.next_range_bi;
 436     }
 437   /* send to next_error_index */
 438   if (~0 != reass->error_next_index)
 439     {
 440       u32 n_left_to_next, *to_next, next_index;
 441
 442       next_index = reass->error_next_index;
 443       u32 bi = ~0;
 444
 445       while (vec_len (to_free) > 0)
 446         {
 447           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 448
 449           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 450             {
 451               bi = vec_pop (to_free);
 452
 453               if (~0 != bi)
 454                 {
 455                   to_next[0] = bi;
 456                   to_next += 1;
 457                   n_left_to_next -= 1;
 458                 }
 459             }
 460           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 461         }
 462     }
 463   else
 464     {
 465       vlib_buffer_free (vm, to_free, vec_len (to_free));
 466     }
 467 }
 468
 469 always_inline void
 470 ip4_full_reass_init (ip4_full_reass_t * reass)
 471 {
 472   reass->first_bi = ~0;
 473   reass->last_packet_octet = ~0;
 474   reass->data_len = 0;
 475   reass->next_index = ~0;
 476   reass->error_next_index = ~0;
 477 }
 478
 479 always_inline ip4_full_reass_t *
 480 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 481                                ip4_full_reass_main_t * rm,
 482                                ip4_full_reass_per_thread_t * rt,
 483                                ip4_full_reass_kv_t * kv, u8 * do_handoff)
 484 {
 485   ip4_full_reass_t *reass;
 486   f64 now;
 487
 488 again:
 489
 490   reass = NULL;
 491   now = vlib_time_now (vm);
 492   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 493     {
 494       if (vm->thread_index != kv->v.memory_owner_thread_index)
 495         {
 496           *do_handoff = 1;
 497           return NULL;
 498         }
 499       reass =
 500         pool_elt_at_index (rm->per_thread_data
 501                            [kv->v.memory_owner_thread_index].pool,
 502                            kv->v.reass_index);
 503
 504       if (now > reass->last_heard + rm->timeout)
 505         {
 506           ip4_full_reass_drop_all (vm, node, rm, reass);
 507           ip4_full_reass_free (rm, rt, reass);
 508           reass = NULL;
 509         }
 510     }
 511
 512   if (reass)
 513     {
 514       reass->last_heard = now;
 515       return reass;
 516     }
 517
 518   if (rt->reass_n >= rm->max_reass_n)
 519     {
 520       reass = NULL;
 521       return reass;
 522     }
 523   else
 524     {
 525       pool_get (rt->pool, reass);
 526       clib_memset (reass, 0, sizeof (*reass));
 527       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 528       reass->memory_owner_thread_index = vm->thread_index;
 529       ++rt->id_counter;
 530       ip4_full_reass_init (reass);
 531       ++rt->reass_n;
 532     }
 533
 534   reass->key.as_u64[0] = kv->kv.key[0];
 535   reass->key.as_u64[1] = kv->kv.key[1];
 536   kv->v.reass_index = (reass - rt->pool);
 537   kv->v.memory_owner_thread_index = vm->thread_index;
 538   reass->last_heard = now;
 539
 540   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 541   if (rv)
 542     {
 543       ip4_full_reass_free_ctx (rt, reass);
 544       reass = NULL;
 545       // if other worker created a context already work with the other copy
 546       if (-2 == rv)
 547         goto again;
 548     }
 549
 550   return reass;
 551 }
 552
 553 always_inline ip4_full_reass_rc_t
 554 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 555                          ip4_full_reass_main_t * rm,
 556                          ip4_full_reass_per_thread_t * rt,
 557                          ip4_full_reass_t * reass, u32 * bi0,
 558                          u32 * next0, u32 * error0, bool is_custom)
 559 {
 560   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 561   vlib_buffer_t *last_b = NULL;
 562   u32 sub_chain_bi = reass->first_bi;
 563   u32 total_length = 0;
 564   u32 buf_cnt = 0;
 565   do
 566     {
 567       u32 tmp_bi = sub_chain_bi;
 568       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 569       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 570       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 571       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 572           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 573         {
 574           return IP4_REASS_RC_INTERNAL_ERROR;
 575         }
 576
 577       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 578       u32 trim_front =
 579         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 580       u32 trim_end =
 581         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 582       if (tmp_bi == reass->first_bi)
 583         {
 584           /* first buffer - keep ip4 header */
 585           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 586             {
 587               return IP4_REASS_RC_INTERNAL_ERROR;
 588             }
 589           trim_front = 0;
 590           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 591             ip4_header_bytes (ip);
 592           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 593             {
 594               return IP4_REASS_RC_INTERNAL_ERROR;
 595             }
 596         }
 597       u32 keep_data =
 598         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 599       while (1)
 600         {
 601           ++buf_cnt;
 602           if (trim_front)
 603             {
 604               if (trim_front > tmp->current_length)
 605                 {
 606                   /* drop whole buffer */
 607                   u32 to_be_freed_bi = tmp_bi;
 608                   trim_front -= tmp->current_length;
 609                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 610                     {
 611                       return IP4_REASS_RC_INTERNAL_ERROR;
 612                     }
 613                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 614                   tmp_bi = tmp->next_buffer;
 615                   tmp->next_buffer = 0;
 616                   tmp = vlib_get_buffer (vm, tmp_bi);
 617                   vlib_buffer_free_one (vm, to_be_freed_bi);
 618                   continue;
 619                 }
 620               else
 621                 {
 622                   vlib_buffer_advance (tmp, trim_front);
 623                   trim_front = 0;
 624                 }
 625             }
 626           if (keep_data)
 627             {
 628               if (last_b)
 629                 {
 630                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 631                   last_b->next_buffer = tmp_bi;
 632                 }
 633               last_b = tmp;
 634               if (keep_data <= tmp->current_length)
 635                 {
 636                   tmp->current_length = keep_data;
 637                   keep_data = 0;
 638                 }
 639               else
 640                 {
 641                   keep_data -= tmp->current_length;
 642                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 643                     {
 644                       return IP4_REASS_RC_INTERNAL_ERROR;
 645                     }
 646                 }
 647               total_length += tmp->current_length;
 648               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 649                 {
 650                   tmp_bi = tmp->next_buffer;
 651                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 652                 }
 653               else
 654                 {
 655                   break;
 656                 }
 657             }
 658           else
 659             {
 660               u32 to_be_freed_bi = tmp_bi;
 661               if (reass->first_bi == tmp_bi)
 662                 {
 663                   return IP4_REASS_RC_INTERNAL_ERROR;
 664                 }
 665               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 666                 {
 667                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 668                   tmp_bi = tmp->next_buffer;
 669                   tmp->next_buffer = 0;
 670                   tmp = vlib_get_buffer (vm, tmp_bi);
 671                   vlib_buffer_free_one (vm, to_be_freed_bi);
 672                 }
 673               else
 674                 {
 675                   tmp->next_buffer = 0;
 676                   vlib_buffer_free_one (vm, to_be_freed_bi);
 677                   break;
 678                 }
 679             }
 680         }
 681       sub_chain_bi =
 682         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 683         reass.next_range_bi;
 684     }
 685   while (~0 != sub_chain_bi);
 686
 687   if (!last_b)
 688     {
 689       return IP4_REASS_RC_INTERNAL_ERROR;
 690     }
 691   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 692
 693   if (total_length < first_b->current_length)
 694     {
 695       return IP4_REASS_RC_INTERNAL_ERROR;
 696     }
 697   total_length -= first_b->current_length;
 698   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 699   first_b->total_length_not_including_first_buffer = total_length;
 700   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 701   ip->flags_and_fragment_offset = 0;
 702   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 703   ip->checksum = ip4_header_checksum (ip);
 704   if (!vlib_buffer_chain_linearize (vm, first_b))
 705     {
 706       return IP4_REASS_RC_NO_BUF;
 707     }
 708   // reset to reconstruct the mbuf linking
 709   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 710   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 711     {
 712       ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 713                                 FINALIZE, 0, ~0);
 714 #if 0
 715       // following code does a hexdump of packet fragments to stdout ...
 716       do
 717         {
 718           u32 bi = reass->first_bi;
 719           u8 *s = NULL;
 720           while (~0 != bi)
 721             {
 722               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 723               s = format (s, "%u: %U\n", bi, format_hexdump,
 724                           vlib_buffer_get_current (b), b->current_length);
 725               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 726                 {
 727                   bi = b->next_buffer;
 728                 }
 729               else
 730                 {
 731                   break;
 732                 }
 733             }
 734           printf ("%.*s\n", vec_len (s), s);
 735           fflush (stdout);
 736           vec_free (s);
 737         }
 738       while (0);
 739 #endif
 740     }
 741   *bi0 = reass->first_bi;
 742   if (!is_custom)
 743     {
 744       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 745     }
 746   else
 747     {
 748       *next0 = reass->next_index;
 749     }
 750   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 751   *error0 = IP4_ERROR_NONE;
 752   ip4_full_reass_free (rm, rt, reass);
 753   reass = NULL;
 754   return IP4_REASS_RC_OK;
 755 }
 756
 757 always_inline ip4_full_reass_rc_t
 758 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 759                                       ip4_full_reass_main_t * rm,
 760                                       ip4_full_reass_per_thread_t * rt,
 761                                       ip4_full_reass_t * reass,
 762                                       u32 prev_range_bi, u32 new_next_bi)
 763 {
 764   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 765   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 766   if (~0 != prev_range_bi)
 767     {
 768       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 769       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 770       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 771       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 772     }
 773   else
 774     {
 775       if (~0 != reass->first_bi)
 776         {
 777           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 778         }
 779       reass->first_bi = new_next_bi;
 780     }
 781   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 782   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 783       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 784     {
 785       return IP4_REASS_RC_INTERNAL_ERROR;
 786     }
 787   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 788   return IP4_REASS_RC_OK;
 789 }
 790
 791 always_inline ip4_full_reass_rc_t
 792 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 793                                         vlib_node_runtime_t * node,
 794                                         ip4_full_reass_main_t * rm,
 795                                         ip4_full_reass_t * reass,
 796                                         u32 prev_range_bi, u32 discard_bi)
 797 {
 798   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 799   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 800   if (~0 != prev_range_bi)
 801     {
 802       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 803       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 804       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 805         {
 806           return IP4_REASS_RC_INTERNAL_ERROR;
 807         }
 808       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 809     }
 810   else
 811     {
 812       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 813     }
 814   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 815   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 816       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 817     {
 818       return IP4_REASS_RC_INTERNAL_ERROR;
 819     }
 820   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 821   while (1)
 822     {
 823       u32 to_be_freed_bi = discard_bi;
 824       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 825         {
 826           ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
 827                                     RANGE_DISCARD, 0, ~0);
 828         }
 829       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 830         {
 831           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 832           discard_bi = discard_b->next_buffer;
 833           discard_b->next_buffer = 0;
 834           discard_b = vlib_get_buffer (vm, discard_bi);
 835           vlib_buffer_free_one (vm, to_be_freed_bi);
 836         }
 837       else
 838         {
 839           discard_b->next_buffer = 0;
 840           vlib_buffer_free_one (vm, to_be_freed_bi);
 841           break;
 842         }
 843     }
 844   return IP4_REASS_RC_OK;
 845 }
 846
 847 always_inline ip4_full_reass_rc_t
 848 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 849                        ip4_full_reass_main_t * rm,
 850                        ip4_full_reass_per_thread_t * rt,
 851                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 852                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 853 {
 854   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 855   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 856   if (is_custom)
 857     {
 858       // store (error_)next_index before it's overwritten
 859       reass->next_index = fvnb->ip.reass.next_index;
 860       reass->error_next_index = fvnb->ip.reass.error_next_index;
 861     }
 862   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 863   int consumed = 0;
 864   ip4_header_t *fip = vlib_buffer_get_current (fb);
 865   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 866   const u32 fragment_length =
 867     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 868   const u32 fragment_last = fragment_first + fragment_length - 1;
 869   fvnb->ip.reass.fragment_first = fragment_first;
 870   fvnb->ip.reass.fragment_last = fragment_last;
 871   int more_fragments = ip4_get_fragment_more (fip);
 872   u32 candidate_range_bi = reass->first_bi;
 873   u32 prev_range_bi = ~0;
 874   fvnb->ip.reass.range_first = fragment_first;
 875   fvnb->ip.reass.range_last = fragment_last;
 876   fvnb->ip.reass.next_range_bi = ~0;
 877   if (!more_fragments)
 878     {
 879       reass->last_packet_octet = fragment_last;
 880     }
 881   if (~0 == reass->first_bi)
 882     {
 883       // starting a new reassembly
 884       rc =
 885         ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 886                                               prev_range_bi, *bi0);
 887       if (IP4_REASS_RC_OK != rc)
 888         {
 889           return rc;
 890         }
 891       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 892         {
 893           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
 894                                     ~0);
 895         }
 896       *bi0 = ~0;
 897       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 898       reass->fragments_n = 1;
 899       return IP4_REASS_RC_OK;
 900     }
 901   reass->min_fragment_length =
 902     clib_min (clib_net_to_host_u16 (fip->length),
 903               fvnb->ip.reass.estimated_mtu);
 904   while (~0 != candidate_range_bi)
 905     {
 906       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 907       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 908       if (fragment_first > candidate_vnb->ip.reass.range_last)
 909         {
 910           // this fragments starts after candidate range
 911           prev_range_bi = candidate_range_bi;
 912           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 913           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 914               ~0 == candidate_range_bi)
 915             {
 916               // special case - this fragment falls beyond all known ranges
 917               rc =
 918                 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 919                                                       prev_range_bi, *bi0);
 920               if (IP4_REASS_RC_OK != rc)
 921                 {
 922                   return rc;
 923                 }
 924               consumed = 1;
 925               break;
 926             }
 927           continue;
 928         }
 929       if (fragment_last < candidate_vnb->ip.reass.range_first)
 930         {
 931           // this fragment ends before candidate range without any overlap
 932           rc =
 933             ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 934                                                   prev_range_bi, *bi0);
 935           if (IP4_REASS_RC_OK != rc)
 936             {
 937               return rc;
 938             }
 939           consumed = 1;
 940         }
 941       else
 942         {
 943           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
 944               fragment_last <= candidate_vnb->ip.reass.range_last)
 945             {
 946               // this fragment is a (sub)part of existing range, ignore it
 947               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 948                 {
 949                   ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
 950                                             RANGE_OVERLAP, 0, ~0);
 951                 }
 952               break;
 953             }
 954           int discard_candidate = 0;
 955           if (fragment_first < candidate_vnb->ip.reass.range_first)
 956             {
 957               u32 overlap =
 958                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
 959               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 960                 {
 961                   candidate_vnb->ip.reass.range_first += overlap;
 962                   if (reass->data_len < overlap)
 963                     {
 964                       return IP4_REASS_RC_INTERNAL_ERROR;
 965                     }
 966                   reass->data_len -= overlap;
 967                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 968                     {
 969                       ip4_full_reass_add_trace (vm, node, rm, reass,
 970                                                 candidate_range_bi,
 971                                                 RANGE_SHRINK, 0, ~0);
 972                     }
 973                   rc =
 974                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 975                                                           prev_range_bi,
 976                                                           *bi0);
 977                   if (IP4_REASS_RC_OK != rc)
 978                     {
 979                       return rc;
 980                     }
 981                   consumed = 1;
 982                 }
 983               else
 984                 {
 985                   discard_candidate = 1;
 986                 }
 987             }
 988           else if (fragment_last > candidate_vnb->ip.reass.range_last)
 989             {
 990               u32 overlap =
 991                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
 992               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 993                 {
 994                   fvnb->ip.reass.range_first += overlap;
 995                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
 996                     {
 997                       prev_range_bi = candidate_range_bi;
 998                       candidate_range_bi =
 999                         candidate_vnb->ip.reass.next_range_bi;
1000                       continue;
1001                     }
1002                   else
1003                     {
1004                       // special case - last range discarded
1005                       rc =
1006                         ip4_full_reass_insert_range_in_chain (vm, rm, rt,
1007                                                               reass,
1008                                                               candidate_range_bi,
1009                                                               *bi0);
1010                       if (IP4_REASS_RC_OK != rc)
1011                         {
1012                           return rc;
1013                         }
1014                       consumed = 1;
1015                     }
1016                 }
1017               else
1018                 {
1019                   discard_candidate = 1;
1020                 }
1021             }
1022           else
1023             {
1024               discard_candidate = 1;
1025             }
1026           if (discard_candidate)
1027             {
1028               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1029               // discard candidate range, probe next range
1030               rc =
1031                 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1032                                                         prev_range_bi,
1033                                                         candidate_range_bi);
1034               if (IP4_REASS_RC_OK != rc)
1035                 {
1036                   return rc;
1037                 }
1038               if (~0 != next_range_bi)
1039                 {
1040                   candidate_range_bi = next_range_bi;
1041                   continue;
1042                 }
1043               else
1044                 {
1045                   // special case - last range discarded
1046                   rc =
1047                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1048                                                           prev_range_bi,
1049                                                           *bi0);
1050                   if (IP4_REASS_RC_OK != rc)
1051                     {
1052                       return rc;
1053                     }
1054                   consumed = 1;
1055                 }
1056             }
1057         }
1058       break;
1059     }
1060   ++reass->fragments_n;
1061   if (consumed)
1062     {
1063       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1064         {
1065           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1066                                     ~0);
1067         }
1068     }
1069   if (~0 != reass->last_packet_octet &&
1070       reass->data_len == reass->last_packet_octet + 1)
1071     {
1072       *handoff_thread_idx = reass->sendout_thread_index;
1073       int handoff =
1074         reass->memory_owner_thread_index != reass->sendout_thread_index;
1075       rc =
1076         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1077                                  is_custom);
1078       if (IP4_REASS_RC_OK == rc && handoff)
1079         {
1080           rc = IP4_REASS_RC_HANDOFF;
1081         }
1082     }
1083   else
1084     {
1085       if (consumed)
1086         {
1087           *bi0 = ~0;
1088           if (reass->fragments_n > rm->max_reass_len)
1089             {
1090               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1091             }
1092         }
1093       else
1094         {
1095           *next0 = IP4_FULL_REASS_NEXT_DROP;
1096           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1097         }
1098     }
1099   return rc;
1100 }
1101
1102 always_inline uword
1103 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1104                        vlib_frame_t * frame, ip4_full_reass_node_type_t type)
1105 {
1106   u32 *from = vlib_frame_vector_args (frame);
1107   u32 n_left_from, n_left_to_next, *to_next, next_index;
1108   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1109   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1110   clib_spinlock_lock (&rt->lock);
1111
1112   n_left_from = frame->n_vectors;
1113   next_index = node->cached_next_index;
1114   while (n_left_from > 0)
1115     {
1116       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1117
1118       while (n_left_from > 0 && n_left_to_next > 0)
1119         {
1120           u32 bi0;
1121           vlib_buffer_t *b0;
1122           u32 next0;
1123           u32 error0 = IP4_ERROR_NONE;
1124
1125           bi0 = from[0];
1126           b0 = vlib_get_buffer (vm, bi0);
1127
1128           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1129           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1130             {
1131               // this is a whole packet - no fragmentation
1132               if (CUSTOM != type)
1133                 {
1134                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1135                 }
1136               else
1137                 {
1138                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1139                 }
1140               goto packet_enqueue;
1141             }
1142           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1143           const u32 fragment_length =
1144             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1145           const u32 fragment_last = fragment_first + fragment_length - 1;
1146           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
1147             {
1148               next0 = IP4_FULL_REASS_NEXT_DROP;
1149               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1150               goto packet_enqueue;
1151             }
1152           ip4_full_reass_kv_t kv;
1153           u8 do_handoff = 0;
1154
1155           kv.k.as_u64[0] =
1156             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1157                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1158             (u64) ip0->src_address.as_u32 << 32;
1159           kv.k.as_u64[1] =
1160             (u64) ip0->dst_address.
1161             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1162
1163           ip4_full_reass_t *reass =
1164             ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1165                                            &do_handoff);
1166
1167           if (reass)
1168             {
1169               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1170               if (0 == fragment_first)
1171                 {
1172                   reass->sendout_thread_index = vm->thread_index;
1173                 }
1174             }
1175
1176           if (PREDICT_FALSE (do_handoff))
1177             {
1178               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1179               vnet_buffer (b0)->ip.reass.owner_thread_index =
1180                 kv.v.memory_owner_thread_index;
1181             }
1182           else if (reass)
1183             {
1184               u32 handoff_thread_idx;
1185               switch (ip4_full_reass_update
1186                       (vm, node, rm, rt, reass, &bi0, &next0,
1187                        &error0, CUSTOM == type, &handoff_thread_idx))
1188                 {
1189                 case IP4_REASS_RC_OK:
1190                   /* nothing to do here */
1191                   break;
1192                 case IP4_REASS_RC_HANDOFF:
1193                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1194                   b0 = vlib_get_buffer (vm, bi0);
1195                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1196                     handoff_thread_idx;
1197                   break;
1198                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1199                   vlib_node_increment_counter (vm, node->node_index,
1200                                                IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1201                                                1);
1202                   ip4_full_reass_drop_all (vm, node, rm, reass);
1203                   ip4_full_reass_free (rm, rt, reass);
1204                   goto next_packet;
1205                   break;
1206                 case IP4_REASS_RC_NO_BUF:
1207                   vlib_node_increment_counter (vm, node->node_index,
1208                                                IP4_ERROR_REASS_NO_BUF, 1);
1209                   ip4_full_reass_drop_all (vm, node, rm, reass);
1210                   ip4_full_reass_free (rm, rt, reass);
1211                   goto next_packet;
1212                   break;
1213                 case IP4_REASS_RC_INTERNAL_ERROR:
1214                   /* drop everything and start with a clean slate */
1215                   vlib_node_increment_counter (vm, node->node_index,
1216                                                IP4_ERROR_REASS_INTERNAL_ERROR,
1217                                                1);
1218                   ip4_full_reass_drop_all (vm, node, rm, reass);
1219                   ip4_full_reass_free (rm, rt, reass);
1220                   goto next_packet;
1221                   break;
1222                 }
1223             }
1224           else
1225             {
1226               next0 = IP4_FULL_REASS_NEXT_DROP;
1227               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1228             }
1229
1230
1231         packet_enqueue:
1232
1233           if (bi0 != ~0)
1234             {
1235               to_next[0] = bi0;
1236               to_next += 1;
1237               n_left_to_next -= 1;
1238
1239               /* bi0 might have been updated by reass_finalize, reload */
1240               b0 = vlib_get_buffer (vm, bi0);
1241               if (IP4_ERROR_NONE != error0)
1242                 {
1243                   b0->error = node->errors[error0];
1244                 }
1245
1246               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1247                 {
1248                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1249                     {
1250                       ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1251                                                 HANDOFF, 0,
1252                                                 vnet_buffer (b0)->ip.
1253                                                 reass.owner_thread_index);
1254                     }
1255                 }
1256               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1257                 {
1258                   vnet_feature_next (&next0, b0);
1259                 }
1260               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1261                                                to_next, n_left_to_next,
1262                                                bi0, next0);
1263               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1264             }
1265
1266         next_packet:
1267           from += 1;
1268           n_left_from -= 1;
1269         }
1270
1271       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1272     }
1273
1274   clib_spinlock_unlock (&rt->lock);
1275   return frame->n_vectors;
1276 }
1277
1278 static char *ip4_full_reass_error_strings[] = {
1279 #define _(sym, string) string,
1280   foreach_ip4_error
1281 #undef _
1282 };
1283
1284 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1285                                     vlib_node_runtime_t * node,
1286                                     vlib_frame_t * frame)
1287 {
1288   return ip4_full_reass_inline (vm, node, frame, NORMAL);
1289 }
1290
1291 /* *INDENT-OFF* */
1292 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1293     .name = "ip4-full-reassembly",
1294     .vector_size = sizeof (u32),
1295     .format_trace = format_ip4_full_reass_trace,
1296     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1297     .error_strings = ip4_full_reass_error_strings,
1298     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1299     .next_nodes =
1300         {
1301                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1302                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1303                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1304
1305         },
1306 };
1307 /* *INDENT-ON* */
1308
1309 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1310                                             vlib_node_runtime_t * node,
1311                                             vlib_frame_t * frame)
1312 {
1313   return ip4_full_reass_inline (vm, node, frame, FEATURE);
1314 }
1315
1316 /* *INDENT-OFF* */
1317 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1318     .name = "ip4-full-reassembly-feature",
1319     .vector_size = sizeof (u32),
1320     .format_trace = format_ip4_full_reass_trace,
1321     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1322     .error_strings = ip4_full_reass_error_strings,
1323     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1324     .next_nodes =
1325         {
1326                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1327                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1328                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1329         },
1330 };
1331 /* *INDENT-ON* */
1332
1333 /* *INDENT-OFF* */
1334 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1335     .arc_name = "ip4-unicast",
1336     .node_name = "ip4-full-reassembly-feature",
1337     .runs_before = VNET_FEATURES ("ip4-lookup",
1338                                   "ipsec4-input-feature"),
1339     .runs_after = 0,
1340 };
1341 /* *INDENT-ON* */
1342
1343 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1344                                            vlib_node_runtime_t * node,
1345                                            vlib_frame_t * frame)
1346 {
1347   return ip4_full_reass_inline (vm, node, frame, CUSTOM);
1348 }
1349
1350 /* *INDENT-OFF* */
1351 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1352     .name = "ip4-full-reassembly-custom",
1353     .vector_size = sizeof (u32),
1354     .format_trace = format_ip4_full_reass_trace,
1355     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1356     .error_strings = ip4_full_reass_error_strings,
1357     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1358     .next_nodes =
1359         {
1360                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1361                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1362                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1363         },
1364 };
1365 /* *INDENT-ON* */
1366
1367 /* *INDENT-OFF* */
1368 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1369     .arc_name = "ip4-unicast",
1370     .node_name = "ip4-full-reassembly-feature",
1371     .runs_before = VNET_FEATURES ("ip4-lookup",
1372                                   "ipsec4-input-feature"),
1373     .runs_after = 0,
1374 };
1375
1376 /* *INDENT-ON* */
1377
1378 #ifndef CLIB_MARCH_VARIANT
1379 uword
1380 ip4_full_reass_custom_register_next_node (uword node_index)
1381 {
1382   return vlib_node_add_next (vlib_get_main (),
1383                              ip4_full_reass_node_custom.index, node_index);
1384 }
1385
1386 always_inline u32
1387 ip4_full_reass_get_nbuckets ()
1388 {
1389   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1390   u32 nbuckets;
1391   u8 i;
1392
1393   nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1394
1395   for (i = 0; i < 31; i++)
1396     if ((1 << i) >= nbuckets)
1397       break;
1398   nbuckets = 1 << i;
1399
1400   return nbuckets;
1401 }
1402 #endif /* CLIB_MARCH_VARIANT */
1403
1404 typedef enum
1405 {
1406   IP4_EVENT_CONFIG_CHANGED = 1,
1407 } ip4_full_reass_event_t;
1408
1409 typedef struct
1410 {
1411   int failure;
1412   clib_bihash_16_8_t *new_hash;
1413 } ip4_rehash_cb_ctx;
1414
1415 #ifndef CLIB_MARCH_VARIANT
1416 static int
1417 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1418 {
1419   ip4_rehash_cb_ctx *ctx = _ctx;
1420   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1421     {
1422       ctx->failure = 1;
1423     }
1424   return (BIHASH_WALK_CONTINUE);
1425 }
1426
1427 static void
1428 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1429                            u32 max_reassembly_length,
1430                            u32 expire_walk_interval_ms)
1431 {
1432   ip4_full_reass_main.timeout_ms = timeout_ms;
1433   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1434   ip4_full_reass_main.max_reass_n = max_reassemblies;
1435   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1436   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1437 }
1438
1439 vnet_api_error_t
1440 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1441                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1442 {
1443   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1444   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1445                              max_reassembly_length, expire_walk_interval_ms);
1446   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1447                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1448                              IP4_EVENT_CONFIG_CHANGED, 0);
1449   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1450   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1451     {
1452       clib_bihash_16_8_t new_hash;
1453       clib_memset (&new_hash, 0, sizeof (new_hash));
1454       ip4_rehash_cb_ctx ctx;
1455       ctx.failure = 0;
1456       ctx.new_hash = &new_hash;
1457       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1458                              new_nbuckets * 1024);
1459       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1460                                                ip4_rehash_cb, &ctx);
1461       if (ctx.failure)
1462         {
1463           clib_bihash_free_16_8 (&new_hash);
1464           return -1;
1465         }
1466       else
1467         {
1468           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1469           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1470                             sizeof (ip4_full_reass_main.hash));
1471           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1472         }
1473     }
1474   return 0;
1475 }
1476
1477 vnet_api_error_t
1478 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1479                     u32 * max_reassembly_length,
1480                     u32 * expire_walk_interval_ms)
1481 {
1482   *timeout_ms = ip4_full_reass_main.timeout_ms;
1483   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1484   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1485   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1486   return 0;
1487 }
1488
1489 static clib_error_t *
1490 ip4_full_reass_init_function (vlib_main_t * vm)
1491 {
1492   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1493   clib_error_t *error = 0;
1494   u32 nbuckets;
1495   vlib_node_t *node;
1496
1497   rm->vlib_main = vm;
1498
1499   vec_validate (rm->per_thread_data, vlib_num_workers ());
1500   ip4_full_reass_per_thread_t *rt;
1501   vec_foreach (rt, rm->per_thread_data)
1502   {
1503     clib_spinlock_init (&rt->lock);
1504     pool_alloc (rt->pool, rm->max_reass_n);
1505   }
1506
1507   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1508   ASSERT (node);
1509   rm->ip4_full_reass_expire_node_idx = node->index;
1510
1511   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1512                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1513                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1514                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1515
1516   nbuckets = ip4_full_reass_get_nbuckets ();
1517   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1518
1519   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1520   ASSERT (node);
1521   rm->ip4_drop_idx = node->index;
1522
1523   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1524   rm->fq_feature_index =
1525     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1526   rm->fq_custom_index =
1527     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1528
1529   rm->feature_use_refcount_per_intf = NULL;
1530   return error;
1531 }
1532
1533 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1534 #endif /* CLIB_MARCH_VARIANT */
1535
1536 static uword
1537 ip4_full_reass_walk_expired (vlib_main_t * vm,
1538                              vlib_node_runtime_t * node, vlib_frame_t * f)
1539 {
1540   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1541   uword event_type, *event_data = 0;
1542
1543   while (true)
1544     {
1545       vlib_process_wait_for_event_or_clock (vm,
1546                                             (f64)
1547                                             rm->expire_walk_interval_ms /
1548                                             (f64) MSEC_PER_SEC);
1549       event_type = vlib_process_get_events (vm, &event_data);
1550
1551       switch (event_type)
1552         {
1553         case ~0:                /* no events => timeout */
1554           /* nothing to do here */
1555           break;
1556         case IP4_EVENT_CONFIG_CHANGED:
1557           break;
1558         default:
1559           clib_warning ("BUG: event type 0x%wx", event_type);
1560           break;
1561         }
1562       f64 now = vlib_time_now (vm);
1563
1564       ip4_full_reass_t *reass;
1565       int *pool_indexes_to_free = NULL;
1566
1567       uword thread_index = 0;
1568       int index;
1569       const uword nthreads = vlib_num_workers () + 1;
1570       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1571         {
1572           ip4_full_reass_per_thread_t *rt =
1573             &rm->per_thread_data[thread_index];
1574           clib_spinlock_lock (&rt->lock);
1575
1576           vec_reset_length (pool_indexes_to_free);
1577           /* *INDENT-OFF* */
1578           pool_foreach_index (index, rt->pool, ({
1579                                 reass = pool_elt_at_index (rt->pool, index);
1580                                 if (now > reass->last_heard + rm->timeout)
1581                                   {
1582                                     vec_add1 (pool_indexes_to_free, index);
1583                                   }
1584                               }));
1585           /* *INDENT-ON* */
1586           int *i;
1587           /* *INDENT-OFF* */
1588           vec_foreach (i, pool_indexes_to_free)
1589           {
1590             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1591             ip4_full_reass_drop_all (vm, node, rm, reass);
1592             ip4_full_reass_free (rm, rt, reass);
1593           }
1594           /* *INDENT-ON* */
1595
1596           clib_spinlock_unlock (&rt->lock);
1597         }
1598
1599       vec_free (pool_indexes_to_free);
1600       if (event_data)
1601         {
1602           _vec_len (event_data) = 0;
1603         }
1604     }
1605
1606   return 0;
1607 }
1608
1609 /* *INDENT-OFF* */
1610 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1611     .function = ip4_full_reass_walk_expired,
1612     .type = VLIB_NODE_TYPE_PROCESS,
1613     .name = "ip4-full-reassembly-expire-walk",
1614     .format_trace = format_ip4_full_reass_trace,
1615     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1616     .error_strings = ip4_full_reass_error_strings,
1617
1618 };
1619 /* *INDENT-ON* */
1620
1621 static u8 *
1622 format_ip4_full_reass_key (u8 * s, va_list * args)
1623 {
1624   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1625   s =
1626     format (s,
1627             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1628             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1629             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1630   return s;
1631 }
1632
1633 static u8 *
1634 format_ip4_reass (u8 * s, va_list * args)
1635 {
1636   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1637   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1638
1639   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1640               "last_packet_octet: %u, trace_op_counter: %u\n",
1641               reass->id, format_ip4_full_reass_key, &reass->key,
1642               reass->first_bi, reass->data_len,
1643               reass->last_packet_octet, reass->trace_op_counter);
1644
1645   u32 bi = reass->first_bi;
1646   u32 counter = 0;
1647   while (~0 != bi)
1648     {
1649       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1650       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1651       s =
1652         format (s,
1653                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1654                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1655                 vnb->ip.reass.range_last, bi,
1656                 ip4_full_reass_buffer_get_data_offset (b),
1657                 ip4_full_reass_buffer_get_data_len (b),
1658                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1659       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1660         {
1661           bi = b->next_buffer;
1662         }
1663       else
1664         {
1665           bi = ~0;
1666         }
1667     }
1668   return s;
1669 }
1670
1671 static clib_error_t *
1672 show_ip4_reass (vlib_main_t * vm,
1673                 unformat_input_t * input,
1674                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1675 {
1676   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1677
1678   vlib_cli_output (vm, "---------------------");
1679   vlib_cli_output (vm, "IP4 reassembly status");
1680   vlib_cli_output (vm, "---------------------");
1681   bool details = false;
1682   if (unformat (input, "details"))
1683     {
1684       details = true;
1685     }
1686
1687   u32 sum_reass_n = 0;
1688   ip4_full_reass_t *reass;
1689   uword thread_index;
1690   const uword nthreads = vlib_num_workers () + 1;
1691   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1692     {
1693       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1694       clib_spinlock_lock (&rt->lock);
1695       if (details)
1696         {
1697           /* *INDENT-OFF* */
1698           pool_foreach (reass, rt->pool, {
1699             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1700           });
1701           /* *INDENT-ON* */
1702         }
1703       sum_reass_n += rt->reass_n;
1704       clib_spinlock_unlock (&rt->lock);
1705     }
1706   vlib_cli_output (vm, "---------------------");
1707   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1708                    (long unsigned) sum_reass_n);
1709   vlib_cli_output (vm,
1710                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1711                    (long unsigned) rm->max_reass_n);
1712   vlib_cli_output (vm,
1713                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1714                    (long unsigned) rm->timeout_ms);
1715   vlib_cli_output (vm,
1716                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1717                    (long unsigned) rm->expire_walk_interval_ms);
1718   return 0;
1719 }
1720
1721 /* *INDENT-OFF* */
1722 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1723     .path = "show ip4-full-reassembly",
1724     .short_help = "show ip4-full-reassembly [details]",
1725     .function = show_ip4_reass,
1726 };
1727 /* *INDENT-ON* */
1728
1729 #ifndef CLIB_MARCH_VARIANT
1730 vnet_api_error_t
1731 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1732 {
1733   return vnet_feature_enable_disable ("ip4-unicast",
1734                                       "ip4-full-reassembly-feature",
1735                                       sw_if_index, enable_disable, 0, 0);
1736 }
1737 #endif /* CLIB_MARCH_VARIANT */
1738
1739
1740 #define foreach_ip4_full_reass_handoff_error                       \
1741 _(CONGESTION_DROP, "congestion drop")
1742
1743
1744 typedef enum
1745 {
1746 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1747   foreach_ip4_full_reass_handoff_error
1748 #undef _
1749     IP4_FULL_REASS_HANDOFF_N_ERROR,
1750 } ip4_full_reass_handoff_error_t;
1751
1752 static char *ip4_full_reass_handoff_error_strings[] = {
1753 #define _(sym,string) string,
1754   foreach_ip4_full_reass_handoff_error
1755 #undef _
1756 };
1757
1758 typedef struct
1759 {
1760   u32 next_worker_index;
1761 } ip4_full_reass_handoff_trace_t;
1762
1763 static u8 *
1764 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1765 {
1766   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1767   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1768   ip4_full_reass_handoff_trace_t *t =
1769     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1770
1771   s =
1772     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1773             t->next_worker_index);
1774
1775   return s;
1776 }
1777
1778 always_inline uword
1779 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1780                                     vlib_node_runtime_t * node,
1781                                     vlib_frame_t * frame,
1782                                     ip4_full_reass_node_type_t type)
1783 {
1784   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1785
1786   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1787   u32 n_enq, n_left_from, *from;
1788   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1789   u32 fq_index;
1790
1791   from = vlib_frame_vector_args (frame);
1792   n_left_from = frame->n_vectors;
1793   vlib_get_buffers (vm, from, bufs, n_left_from);
1794
1795   b = bufs;
1796   ti = thread_indices;
1797
1798   switch (type)
1799     {
1800     case NORMAL:
1801       fq_index = rm->fq_index;
1802       break;
1803     case FEATURE:
1804       fq_index = rm->fq_feature_index;
1805       break;
1806     case CUSTOM:
1807       fq_index = rm->fq_custom_index;
1808       break;
1809     default:
1810       clib_warning ("Unexpected `type' (%d)!", type);
1811       ASSERT (0);
1812     }
1813
1814   while (n_left_from > 0)
1815     {
1816       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1817
1818       if (PREDICT_FALSE
1819           ((node->flags & VLIB_NODE_FLAG_TRACE)
1820            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1821         {
1822           ip4_full_reass_handoff_trace_t *t =
1823             vlib_add_trace (vm, node, b[0], sizeof (*t));
1824           t->next_worker_index = ti[0];
1825         }
1826
1827       n_left_from -= 1;
1828       ti += 1;
1829       b += 1;
1830     }
1831   n_enq =
1832     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1833                                    frame->n_vectors, 1);
1834
1835   if (n_enq < frame->n_vectors)
1836     vlib_node_increment_counter (vm, node->node_index,
1837                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1838                                  frame->n_vectors - n_enq);
1839   return frame->n_vectors;
1840 }
1841
1842 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1843                                             vlib_node_runtime_t * node,
1844                                             vlib_frame_t * frame)
1845 {
1846   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
1847 }
1848
1849
1850 /* *INDENT-OFF* */
1851 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1852   .name = "ip4-full-reassembly-handoff",
1853   .vector_size = sizeof (u32),
1854   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1855   .error_strings = ip4_full_reass_handoff_error_strings,
1856   .format_trace = format_ip4_full_reass_handoff_trace,
1857
1858   .n_next_nodes = 1,
1859
1860   .next_nodes = {
1861     [0] = "error-drop",
1862   },
1863 };
1864 /* *INDENT-ON* */
1865
1866
1867 /* *INDENT-OFF* */
1868 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1869                                                     vlib_node_runtime_t *
1870                                                     node,
1871                                                     vlib_frame_t * frame)
1872 {
1873   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
1874 }
1875 /* *INDENT-ON* */
1876
1877
1878 /* *INDENT-OFF* */
1879 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1880   .name = "ip4-full-reass-feature-hoff",
1881   .vector_size = sizeof (u32),
1882   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1883   .error_strings = ip4_full_reass_handoff_error_strings,
1884   .format_trace = format_ip4_full_reass_handoff_trace,
1885
1886   .n_next_nodes = 1,
1887
1888   .next_nodes = {
1889     [0] = "error-drop",
1890   },
1891 };
1892 /* *INDENT-ON* */
1893
1894 /* *INDENT-OFF* */
1895 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1896                                                     vlib_node_runtime_t *
1897                                                     node,
1898                                                     vlib_frame_t * frame)
1899 {
1900   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
1901 }
1902 /* *INDENT-ON* */
1903
1904
1905 /* *INDENT-OFF* */
1906 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1907   .name = "ip4-full-reass-custom-hoff",
1908   .vector_size = sizeof (u32),
1909   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1910   .error_strings = ip4_full_reass_handoff_error_strings,
1911   .format_trace = format_ip4_full_reass_handoff_trace,
1912
1913   .n_next_nodes = 1,
1914
1915   .next_nodes = {
1916     [0] = "error-drop",
1917   },
1918 };
1919 /* *INDENT-ON* */
1920
1921 #ifndef CLIB_MARCH_VARIANT
1922 int
1923 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1924 {
1925   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1926   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1927   if (is_enable)
1928     {
1929       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1930         {
1931           ++rm->feature_use_refcount_per_intf[sw_if_index];
1932           return vnet_feature_enable_disable ("ip4-unicast",
1933                                               "ip4-full-reassembly-feature",
1934                                               sw_if_index, 1, 0, 0);
1935         }
1936       ++rm->feature_use_refcount_per_intf[sw_if_index];
1937     }
1938   else
1939     {
1940       --rm->feature_use_refcount_per_intf[sw_if_index];
1941       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1942         return vnet_feature_enable_disable ("ip4-unicast",
1943                                             "ip4-full-reassembly-feature",
1944                                             sw_if_index, 0, 0, 0);
1945     }
1946   return -1;
1947 }
1948 #endif
1949
1950 /*
1951  * fd.io coding-style-patch-verification: ON
1952  *
1953  * Local Variables:
1954  * eval: (c-set-style "gnu")
1955  * End:
1956  */