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   if (pool_is_free_index
 346       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 347     {
 348       // this buffer's trace is gone
 349       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 350       return;
 351     }
 352   bool is_after_handoff = false;
 353   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 354     {
 355       is_after_handoff = true;
 356     }
 357   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 358   t->is_after_handoff = is_after_handoff;
 359   if (t->is_after_handoff)
 360     {
 361       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 362                    clib_min (sizeof (t->ip4_header), b->current_length));
 363     }
 364   if (reass)
 365     {
 366       t->reass_id = reass->id;
 367       t->op_id = reass->trace_op_counter;
 368       t->trace_range.first_bi = reass->first_bi;
 369       t->total_data_len = reass->data_len;
 370       ++reass->trace_op_counter;
 371     }
 372   else
 373     {
 374       t->reass_id = ~0;
 375       t->op_id = 0;
 376       t->trace_range.first_bi = 0;
 377       t->total_data_len = 0;
 378     }
 379   t->action = action;
 380   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 381   t->size_diff = size_diff;
 382   t->thread_id = vm->thread_index;
 383   t->thread_id_to = thread_id_to;
 384   t->fragment_first = vnb->ip.reass.fragment_first;
 385   t->fragment_last = vnb->ip.reass.fragment_last;
 386 #if 0
 387   static u8 *s = NULL;
 388   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 389   printf ("%.*s\n", vec_len (s), s);
 390   fflush (stdout);
 391   vec_reset_length (s);
 392 #endif
 393 }
 394
 395 always_inline void
 396 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 397                          ip4_full_reass_t * reass)
 398 {
 399   pool_put (rt->pool, reass);
 400   --rt->reass_n;
 401 }
 402
 403 always_inline void
 404 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 405                      ip4_full_reass_per_thread_t * rt,
 406                      ip4_full_reass_t * reass)
 407 {
 408   clib_bihash_kv_16_8_t kv;
 409   kv.key[0] = reass->key.as_u64[0];
 410   kv.key[1] = reass->key.as_u64[1];
 411   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 412   return ip4_full_reass_free_ctx (rt, reass);
 413 }
 414
 415 always_inline void
 416 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 417                          ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
 418 {
 419   u32 range_bi = reass->first_bi;
 420   vlib_buffer_t *range_b;
 421   vnet_buffer_opaque_t *range_vnb;
 422   u32 *to_free = NULL;
 423   while (~0 != range_bi)
 424     {
 425       range_b = vlib_get_buffer (vm, range_bi);
 426       range_vnb = vnet_buffer (range_b);
 427       u32 bi = range_bi;
 428       while (~0 != bi)
 429         {
 430           vec_add1 (to_free, bi);
 431           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 432           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 433             {
 434               bi = b->next_buffer;
 435               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 436             }
 437           else
 438             {
 439               bi = ~0;
 440             }
 441         }
 442       range_bi = range_vnb->ip.reass.next_range_bi;
 443     }
 444   /* send to next_error_index */
 445   if (~0 != reass->error_next_index)
 446     {
 447       u32 n_left_to_next, *to_next, next_index;
 448
 449       next_index = reass->error_next_index;
 450       u32 bi = ~0;
 451
 452       while (vec_len (to_free) > 0)
 453         {
 454           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 455
 456           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 457             {
 458               bi = vec_pop (to_free);
 459
 460               if (~0 != bi)
 461                 {
 462                   to_next[0] = bi;
 463                   to_next += 1;
 464                   n_left_to_next -= 1;
 465                 }
 466             }
 467           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 468         }
 469     }
 470   else
 471     {
 472       vlib_buffer_free (vm, to_free, vec_len (to_free));
 473     }
 474   vec_free (to_free);
 475 }
 476
 477 always_inline void
 478 ip4_full_reass_init (ip4_full_reass_t * reass)
 479 {
 480   reass->first_bi = ~0;
 481   reass->last_packet_octet = ~0;
 482   reass->data_len = 0;
 483   reass->next_index = ~0;
 484   reass->error_next_index = ~0;
 485 }
 486
 487 always_inline ip4_full_reass_t *
 488 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 489                                ip4_full_reass_main_t * rm,
 490                                ip4_full_reass_per_thread_t * rt,
 491                                ip4_full_reass_kv_t * kv, u8 * do_handoff)
 492 {
 493   ip4_full_reass_t *reass;
 494   f64 now;
 495
 496 again:
 497
 498   reass = NULL;
 499   now = vlib_time_now (vm);
 500   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 501     {
 502       if (vm->thread_index != kv->v.memory_owner_thread_index)
 503         {
 504           *do_handoff = 1;
 505           return NULL;
 506         }
 507       reass =
 508         pool_elt_at_index (rm->per_thread_data
 509                            [kv->v.memory_owner_thread_index].pool,
 510                            kv->v.reass_index);
 511
 512       if (now > reass->last_heard + rm->timeout)
 513         {
 514           ip4_full_reass_drop_all (vm, node, rm, reass);
 515           ip4_full_reass_free (rm, rt, reass);
 516           reass = NULL;
 517         }
 518     }
 519
 520   if (reass)
 521     {
 522       reass->last_heard = now;
 523       return reass;
 524     }
 525
 526   if (rt->reass_n >= rm->max_reass_n)
 527     {
 528       reass = NULL;
 529       return reass;
 530     }
 531   else
 532     {
 533       pool_get (rt->pool, reass);
 534       clib_memset (reass, 0, sizeof (*reass));
 535       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 536       reass->memory_owner_thread_index = vm->thread_index;
 537       ++rt->id_counter;
 538       ip4_full_reass_init (reass);
 539       ++rt->reass_n;
 540     }
 541
 542   reass->key.as_u64[0] = kv->kv.key[0];
 543   reass->key.as_u64[1] = kv->kv.key[1];
 544   kv->v.reass_index = (reass - rt->pool);
 545   kv->v.memory_owner_thread_index = vm->thread_index;
 546   reass->last_heard = now;
 547
 548   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 549   if (rv)
 550     {
 551       ip4_full_reass_free_ctx (rt, reass);
 552       reass = NULL;
 553       // if other worker created a context already work with the other copy
 554       if (-2 == rv)
 555         goto again;
 556     }
 557
 558   return reass;
 559 }
 560
 561 always_inline ip4_full_reass_rc_t
 562 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 563                          ip4_full_reass_main_t * rm,
 564                          ip4_full_reass_per_thread_t * rt,
 565                          ip4_full_reass_t * reass, u32 * bi0,
 566                          u32 * next0, u32 * error0, bool is_custom)
 567 {
 568   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 569   vlib_buffer_t *last_b = NULL;
 570   u32 sub_chain_bi = reass->first_bi;
 571   u32 total_length = 0;
 572   u32 buf_cnt = 0;
 573   do
 574     {
 575       u32 tmp_bi = sub_chain_bi;
 576       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 577       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 578       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 579       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 580           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 581         {
 582           return IP4_REASS_RC_INTERNAL_ERROR;
 583         }
 584
 585       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 586       u32 trim_front =
 587         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 588       u32 trim_end =
 589         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 590       if (tmp_bi == reass->first_bi)
 591         {
 592           /* first buffer - keep ip4 header */
 593           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 594             {
 595               return IP4_REASS_RC_INTERNAL_ERROR;
 596             }
 597           trim_front = 0;
 598           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 599             ip4_header_bytes (ip);
 600           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 601             {
 602               return IP4_REASS_RC_INTERNAL_ERROR;
 603             }
 604         }
 605       u32 keep_data =
 606         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 607       while (1)
 608         {
 609           ++buf_cnt;
 610           if (trim_front)
 611             {
 612               if (trim_front > tmp->current_length)
 613                 {
 614                   /* drop whole buffer */
 615                   u32 to_be_freed_bi = tmp_bi;
 616                   trim_front -= tmp->current_length;
 617                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 618                     {
 619                       return IP4_REASS_RC_INTERNAL_ERROR;
 620                     }
 621                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 622                   tmp_bi = tmp->next_buffer;
 623                   tmp->next_buffer = 0;
 624                   tmp = vlib_get_buffer (vm, tmp_bi);
 625                   vlib_buffer_free_one (vm, to_be_freed_bi);
 626                   continue;
 627                 }
 628               else
 629                 {
 630                   vlib_buffer_advance (tmp, trim_front);
 631                   trim_front = 0;
 632                 }
 633             }
 634           if (keep_data)
 635             {
 636               if (last_b)
 637                 {
 638                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 639                   last_b->next_buffer = tmp_bi;
 640                 }
 641               last_b = tmp;
 642               if (keep_data <= tmp->current_length)
 643                 {
 644                   tmp->current_length = keep_data;
 645                   keep_data = 0;
 646                 }
 647               else
 648                 {
 649                   keep_data -= tmp->current_length;
 650                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 651                     {
 652                       return IP4_REASS_RC_INTERNAL_ERROR;
 653                     }
 654                 }
 655               total_length += tmp->current_length;
 656               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 657                 {
 658                   tmp_bi = tmp->next_buffer;
 659                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 660                 }
 661               else
 662                 {
 663                   break;
 664                 }
 665             }
 666           else
 667             {
 668               u32 to_be_freed_bi = tmp_bi;
 669               if (reass->first_bi == tmp_bi)
 670                 {
 671                   return IP4_REASS_RC_INTERNAL_ERROR;
 672                 }
 673               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 674                 {
 675                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 676                   tmp_bi = tmp->next_buffer;
 677                   tmp->next_buffer = 0;
 678                   tmp = vlib_get_buffer (vm, tmp_bi);
 679                   vlib_buffer_free_one (vm, to_be_freed_bi);
 680                 }
 681               else
 682                 {
 683                   tmp->next_buffer = 0;
 684                   vlib_buffer_free_one (vm, to_be_freed_bi);
 685                   break;
 686                 }
 687             }
 688         }
 689       sub_chain_bi =
 690         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 691         reass.next_range_bi;
 692     }
 693   while (~0 != sub_chain_bi);
 694
 695   if (!last_b)
 696     {
 697       return IP4_REASS_RC_INTERNAL_ERROR;
 698     }
 699   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 700
 701   if (total_length < first_b->current_length)
 702     {
 703       return IP4_REASS_RC_INTERNAL_ERROR;
 704     }
 705   total_length -= first_b->current_length;
 706   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 707   first_b->total_length_not_including_first_buffer = total_length;
 708   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 709   ip->flags_and_fragment_offset = 0;
 710   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 711   ip->checksum = ip4_header_checksum (ip);
 712   if (!vlib_buffer_chain_linearize (vm, first_b))
 713     {
 714       return IP4_REASS_RC_NO_BUF;
 715     }
 716   // reset to reconstruct the mbuf linking
 717   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 718   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 719     {
 720       ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 721                                 FINALIZE, 0, ~0);
 722 #if 0
 723       // following code does a hexdump of packet fragments to stdout ...
 724       do
 725         {
 726           u32 bi = reass->first_bi;
 727           u8 *s = NULL;
 728           while (~0 != bi)
 729             {
 730               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 731               s = format (s, "%u: %U\n", bi, format_hexdump,
 732                           vlib_buffer_get_current (b), b->current_length);
 733               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 734                 {
 735                   bi = b->next_buffer;
 736                 }
 737               else
 738                 {
 739                   break;
 740                 }
 741             }
 742           printf ("%.*s\n", vec_len (s), s);
 743           fflush (stdout);
 744           vec_free (s);
 745         }
 746       while (0);
 747 #endif
 748     }
 749   *bi0 = reass->first_bi;
 750   if (!is_custom)
 751     {
 752       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 753     }
 754   else
 755     {
 756       *next0 = reass->next_index;
 757     }
 758   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 759   *error0 = IP4_ERROR_NONE;
 760   ip4_full_reass_free (rm, rt, reass);
 761   reass = NULL;
 762   return IP4_REASS_RC_OK;
 763 }
 764
 765 always_inline ip4_full_reass_rc_t
 766 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 767                                       ip4_full_reass_main_t * rm,
 768                                       ip4_full_reass_per_thread_t * rt,
 769                                       ip4_full_reass_t * reass,
 770                                       u32 prev_range_bi, u32 new_next_bi)
 771 {
 772   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 773   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 774   if (~0 != prev_range_bi)
 775     {
 776       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 777       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 778       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 779       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 780     }
 781   else
 782     {
 783       if (~0 != reass->first_bi)
 784         {
 785           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 786         }
 787       reass->first_bi = new_next_bi;
 788     }
 789   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 790   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 791       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 792     {
 793       return IP4_REASS_RC_INTERNAL_ERROR;
 794     }
 795   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 796   return IP4_REASS_RC_OK;
 797 }
 798
 799 always_inline ip4_full_reass_rc_t
 800 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 801                                         vlib_node_runtime_t * node,
 802                                         ip4_full_reass_main_t * rm,
 803                                         ip4_full_reass_t * reass,
 804                                         u32 prev_range_bi, u32 discard_bi)
 805 {
 806   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 807   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 808   if (~0 != prev_range_bi)
 809     {
 810       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 811       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 812       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 813         {
 814           return IP4_REASS_RC_INTERNAL_ERROR;
 815         }
 816       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 817     }
 818   else
 819     {
 820       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 821     }
 822   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 823   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 824       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 825     {
 826       return IP4_REASS_RC_INTERNAL_ERROR;
 827     }
 828   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 829   while (1)
 830     {
 831       u32 to_be_freed_bi = discard_bi;
 832       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 833         {
 834           ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
 835                                     RANGE_DISCARD, 0, ~0);
 836         }
 837       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 838         {
 839           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 840           discard_bi = discard_b->next_buffer;
 841           discard_b->next_buffer = 0;
 842           discard_b = vlib_get_buffer (vm, discard_bi);
 843           vlib_buffer_free_one (vm, to_be_freed_bi);
 844         }
 845       else
 846         {
 847           discard_b->next_buffer = 0;
 848           vlib_buffer_free_one (vm, to_be_freed_bi);
 849           break;
 850         }
 851     }
 852   return IP4_REASS_RC_OK;
 853 }
 854
 855 always_inline ip4_full_reass_rc_t
 856 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 857                        ip4_full_reass_main_t * rm,
 858                        ip4_full_reass_per_thread_t * rt,
 859                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 860                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 861 {
 862   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 863   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 864   if (is_custom)
 865     {
 866       // store (error_)next_index before it's overwritten
 867       reass->next_index = fvnb->ip.reass.next_index;
 868       reass->error_next_index = fvnb->ip.reass.error_next_index;
 869     }
 870   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 871   int consumed = 0;
 872   ip4_header_t *fip = vlib_buffer_get_current (fb);
 873   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 874   const u32 fragment_length =
 875     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 876   const u32 fragment_last = fragment_first + fragment_length - 1;
 877   fvnb->ip.reass.fragment_first = fragment_first;
 878   fvnb->ip.reass.fragment_last = fragment_last;
 879   int more_fragments = ip4_get_fragment_more (fip);
 880   u32 candidate_range_bi = reass->first_bi;
 881   u32 prev_range_bi = ~0;
 882   fvnb->ip.reass.range_first = fragment_first;
 883   fvnb->ip.reass.range_last = fragment_last;
 884   fvnb->ip.reass.next_range_bi = ~0;
 885   if (!more_fragments)
 886     {
 887       reass->last_packet_octet = fragment_last;
 888     }
 889   if (~0 == reass->first_bi)
 890     {
 891       // starting a new reassembly
 892       rc =
 893         ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 894                                               prev_range_bi, *bi0);
 895       if (IP4_REASS_RC_OK != rc)
 896         {
 897           return rc;
 898         }
 899       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 900         {
 901           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
 902                                     ~0);
 903         }
 904       *bi0 = ~0;
 905       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 906       reass->fragments_n = 1;
 907       return IP4_REASS_RC_OK;
 908     }
 909   reass->min_fragment_length =
 910     clib_min (clib_net_to_host_u16 (fip->length),
 911               fvnb->ip.reass.estimated_mtu);
 912   while (~0 != candidate_range_bi)
 913     {
 914       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 915       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 916       if (fragment_first > candidate_vnb->ip.reass.range_last)
 917         {
 918           // this fragments starts after candidate range
 919           prev_range_bi = candidate_range_bi;
 920           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 921           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 922               ~0 == candidate_range_bi)
 923             {
 924               // special case - this fragment falls beyond all known ranges
 925               rc =
 926                 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 927                                                       prev_range_bi, *bi0);
 928               if (IP4_REASS_RC_OK != rc)
 929                 {
 930                   return rc;
 931                 }
 932               consumed = 1;
 933               break;
 934             }
 935           continue;
 936         }
 937       if (fragment_last < candidate_vnb->ip.reass.range_first)
 938         {
 939           // this fragment ends before candidate range without any overlap
 940           rc =
 941             ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 942                                                   prev_range_bi, *bi0);
 943           if (IP4_REASS_RC_OK != rc)
 944             {
 945               return rc;
 946             }
 947           consumed = 1;
 948         }
 949       else
 950         {
 951           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
 952               fragment_last <= candidate_vnb->ip.reass.range_last)
 953             {
 954               // this fragment is a (sub)part of existing range, ignore it
 955               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 956                 {
 957                   ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
 958                                             RANGE_OVERLAP, 0, ~0);
 959                 }
 960               break;
 961             }
 962           int discard_candidate = 0;
 963           if (fragment_first < candidate_vnb->ip.reass.range_first)
 964             {
 965               u32 overlap =
 966                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
 967               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 968                 {
 969                   candidate_vnb->ip.reass.range_first += overlap;
 970                   if (reass->data_len < overlap)
 971                     {
 972                       return IP4_REASS_RC_INTERNAL_ERROR;
 973                     }
 974                   reass->data_len -= overlap;
 975                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 976                     {
 977                       ip4_full_reass_add_trace (vm, node, rm, reass,
 978                                                 candidate_range_bi,
 979                                                 RANGE_SHRINK, 0, ~0);
 980                     }
 981                   rc =
 982                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 983                                                           prev_range_bi,
 984                                                           *bi0);
 985                   if (IP4_REASS_RC_OK != rc)
 986                     {
 987                       return rc;
 988                     }
 989                   consumed = 1;
 990                 }
 991               else
 992                 {
 993                   discard_candidate = 1;
 994                 }
 995             }
 996           else if (fragment_last > candidate_vnb->ip.reass.range_last)
 997             {
 998               u32 overlap =
 999                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1000               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1001                 {
1002                   fvnb->ip.reass.range_first += overlap;
1003                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1004                     {
1005                       prev_range_bi = candidate_range_bi;
1006                       candidate_range_bi =
1007                         candidate_vnb->ip.reass.next_range_bi;
1008                       continue;
1009                     }
1010                   else
1011                     {
1012                       // special case - last range discarded
1013                       rc =
1014                         ip4_full_reass_insert_range_in_chain (vm, rm, rt,
1015                                                               reass,
1016                                                               candidate_range_bi,
1017                                                               *bi0);
1018                       if (IP4_REASS_RC_OK != rc)
1019                         {
1020                           return rc;
1021                         }
1022                       consumed = 1;
1023                     }
1024                 }
1025               else
1026                 {
1027                   discard_candidate = 1;
1028                 }
1029             }
1030           else
1031             {
1032               discard_candidate = 1;
1033             }
1034           if (discard_candidate)
1035             {
1036               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1037               // discard candidate range, probe next range
1038               rc =
1039                 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1040                                                         prev_range_bi,
1041                                                         candidate_range_bi);
1042               if (IP4_REASS_RC_OK != rc)
1043                 {
1044                   return rc;
1045                 }
1046               if (~0 != next_range_bi)
1047                 {
1048                   candidate_range_bi = next_range_bi;
1049                   continue;
1050                 }
1051               else
1052                 {
1053                   // special case - last range discarded
1054                   rc =
1055                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1056                                                           prev_range_bi,
1057                                                           *bi0);
1058                   if (IP4_REASS_RC_OK != rc)
1059                     {
1060                       return rc;
1061                     }
1062                   consumed = 1;
1063                 }
1064             }
1065         }
1066       break;
1067     }
1068   ++reass->fragments_n;
1069   if (consumed)
1070     {
1071       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1072         {
1073           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1074                                     ~0);
1075         }
1076     }
1077   if (~0 != reass->last_packet_octet &&
1078       reass->data_len == reass->last_packet_octet + 1)
1079     {
1080       *handoff_thread_idx = reass->sendout_thread_index;
1081       int handoff =
1082         reass->memory_owner_thread_index != reass->sendout_thread_index;
1083       rc =
1084         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1085                                  is_custom);
1086       if (IP4_REASS_RC_OK == rc && handoff)
1087         {
1088           rc = IP4_REASS_RC_HANDOFF;
1089         }
1090     }
1091   else
1092     {
1093       if (consumed)
1094         {
1095           *bi0 = ~0;
1096           if (reass->fragments_n > rm->max_reass_len)
1097             {
1098               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1099             }
1100         }
1101       else
1102         {
1103           *next0 = IP4_FULL_REASS_NEXT_DROP;
1104           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1105         }
1106     }
1107   return rc;
1108 }
1109
1110 always_inline uword
1111 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1112                        vlib_frame_t * frame, ip4_full_reass_node_type_t type)
1113 {
1114   u32 *from = vlib_frame_vector_args (frame);
1115   u32 n_left_from, n_left_to_next, *to_next, next_index;
1116   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1117   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1118   clib_spinlock_lock (&rt->lock);
1119
1120   n_left_from = frame->n_vectors;
1121   next_index = node->cached_next_index;
1122   while (n_left_from > 0)
1123     {
1124       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1125
1126       while (n_left_from > 0 && n_left_to_next > 0)
1127         {
1128           u32 bi0;
1129           vlib_buffer_t *b0;
1130           u32 next0;
1131           u32 error0 = IP4_ERROR_NONE;
1132
1133           bi0 = from[0];
1134           b0 = vlib_get_buffer (vm, bi0);
1135
1136           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1137           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1138             {
1139               // this is a whole packet - no fragmentation
1140               if (CUSTOM != type)
1141                 {
1142                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1143                 }
1144               else
1145                 {
1146                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1147                 }
1148               goto packet_enqueue;
1149             }
1150           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1151           const u32 fragment_length =
1152             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1153           const u32 fragment_last = fragment_first + fragment_length - 1;
1154           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
1155             {
1156               next0 = IP4_FULL_REASS_NEXT_DROP;
1157               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1158               goto packet_enqueue;
1159             }
1160           ip4_full_reass_kv_t kv;
1161           u8 do_handoff = 0;
1162
1163           kv.k.as_u64[0] =
1164             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1165                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1166             (u64) ip0->src_address.as_u32 << 32;
1167           kv.k.as_u64[1] =
1168             (u64) ip0->dst_address.
1169             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1170
1171           ip4_full_reass_t *reass =
1172             ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1173                                            &do_handoff);
1174
1175           if (reass)
1176             {
1177               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1178               if (0 == fragment_first)
1179                 {
1180                   reass->sendout_thread_index = vm->thread_index;
1181                 }
1182             }
1183
1184           if (PREDICT_FALSE (do_handoff))
1185             {
1186               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1187               vnet_buffer (b0)->ip.reass.owner_thread_index =
1188                 kv.v.memory_owner_thread_index;
1189             }
1190           else if (reass)
1191             {
1192               u32 handoff_thread_idx;
1193               switch (ip4_full_reass_update
1194                       (vm, node, rm, rt, reass, &bi0, &next0,
1195                        &error0, CUSTOM == type, &handoff_thread_idx))
1196                 {
1197                 case IP4_REASS_RC_OK:
1198                   /* nothing to do here */
1199                   break;
1200                 case IP4_REASS_RC_HANDOFF:
1201                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1202                   b0 = vlib_get_buffer (vm, bi0);
1203                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1204                     handoff_thread_idx;
1205                   break;
1206                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1207                   vlib_node_increment_counter (vm, node->node_index,
1208                                                IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1209                                                1);
1210                   ip4_full_reass_drop_all (vm, node, rm, reass);
1211                   ip4_full_reass_free (rm, rt, reass);
1212                   goto next_packet;
1213                   break;
1214                 case IP4_REASS_RC_NO_BUF:
1215                   vlib_node_increment_counter (vm, node->node_index,
1216                                                IP4_ERROR_REASS_NO_BUF, 1);
1217                   ip4_full_reass_drop_all (vm, node, rm, reass);
1218                   ip4_full_reass_free (rm, rt, reass);
1219                   goto next_packet;
1220                   break;
1221                 case IP4_REASS_RC_INTERNAL_ERROR:
1222                   /* drop everything and start with a clean slate */
1223                   vlib_node_increment_counter (vm, node->node_index,
1224                                                IP4_ERROR_REASS_INTERNAL_ERROR,
1225                                                1);
1226                   ip4_full_reass_drop_all (vm, node, rm, reass);
1227                   ip4_full_reass_free (rm, rt, reass);
1228                   goto next_packet;
1229                   break;
1230                 }
1231             }
1232           else
1233             {
1234               next0 = IP4_FULL_REASS_NEXT_DROP;
1235               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1236             }
1237
1238
1239         packet_enqueue:
1240
1241           if (bi0 != ~0)
1242             {
1243               to_next[0] = bi0;
1244               to_next += 1;
1245               n_left_to_next -= 1;
1246
1247               /* bi0 might have been updated by reass_finalize, reload */
1248               b0 = vlib_get_buffer (vm, bi0);
1249               if (IP4_ERROR_NONE != error0)
1250                 {
1251                   b0->error = node->errors[error0];
1252                 }
1253
1254               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1255                 {
1256                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1257                     {
1258                       ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1259                                                 HANDOFF, 0,
1260                                                 vnet_buffer (b0)->ip.
1261                                                 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);
1297 }
1298
1299 /* *INDENT-OFF* */
1300 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1301     .name = "ip4-full-reassembly",
1302     .vector_size = sizeof (u32),
1303     .format_trace = format_ip4_full_reass_trace,
1304     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1305     .error_strings = ip4_full_reass_error_strings,
1306     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1307     .next_nodes =
1308         {
1309                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1310                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1311                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1312
1313         },
1314 };
1315 /* *INDENT-ON* */
1316
1317 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1318                                             vlib_node_runtime_t * node,
1319                                             vlib_frame_t * frame)
1320 {
1321   return ip4_full_reass_inline (vm, node, frame, FEATURE);
1322 }
1323
1324 /* *INDENT-OFF* */
1325 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1326     .name = "ip4-full-reassembly-feature",
1327     .vector_size = sizeof (u32),
1328     .format_trace = format_ip4_full_reass_trace,
1329     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1330     .error_strings = ip4_full_reass_error_strings,
1331     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1332     .next_nodes =
1333         {
1334                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1335                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1336                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1337         },
1338 };
1339 /* *INDENT-ON* */
1340
1341 /* *INDENT-OFF* */
1342 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1343     .arc_name = "ip4-unicast",
1344     .node_name = "ip4-full-reassembly-feature",
1345     .runs_before = VNET_FEATURES ("ip4-lookup",
1346                                   "ipsec4-input-feature"),
1347     .runs_after = 0,
1348 };
1349 /* *INDENT-ON* */
1350
1351 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1352                                            vlib_node_runtime_t * node,
1353                                            vlib_frame_t * frame)
1354 {
1355   return ip4_full_reass_inline (vm, node, frame, CUSTOM);
1356 }
1357
1358 /* *INDENT-OFF* */
1359 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1360     .name = "ip4-full-reassembly-custom",
1361     .vector_size = sizeof (u32),
1362     .format_trace = format_ip4_full_reass_trace,
1363     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1364     .error_strings = ip4_full_reass_error_strings,
1365     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1366     .next_nodes =
1367         {
1368                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1369                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1370                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1371         },
1372 };
1373 /* *INDENT-ON* */
1374
1375 /* *INDENT-OFF* */
1376 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1377     .arc_name = "ip4-unicast",
1378     .node_name = "ip4-full-reassembly-feature",
1379     .runs_before = VNET_FEATURES ("ip4-lookup",
1380                                   "ipsec4-input-feature"),
1381     .runs_after = 0,
1382 };
1383
1384 /* *INDENT-ON* */
1385
1386 #ifndef CLIB_MARCH_VARIANT
1387 uword
1388 ip4_full_reass_custom_register_next_node (uword node_index)
1389 {
1390   return vlib_node_add_next (vlib_get_main (),
1391                              ip4_full_reass_node_custom.index, node_index);
1392 }
1393
1394 always_inline u32
1395 ip4_full_reass_get_nbuckets ()
1396 {
1397   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1398   u32 nbuckets;
1399   u8 i;
1400
1401   nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1402
1403   for (i = 0; i < 31; i++)
1404     if ((1 << i) >= nbuckets)
1405       break;
1406   nbuckets = 1 << i;
1407
1408   return nbuckets;
1409 }
1410 #endif /* CLIB_MARCH_VARIANT */
1411
1412 typedef enum
1413 {
1414   IP4_EVENT_CONFIG_CHANGED = 1,
1415 } ip4_full_reass_event_t;
1416
1417 typedef struct
1418 {
1419   int failure;
1420   clib_bihash_16_8_t *new_hash;
1421 } ip4_rehash_cb_ctx;
1422
1423 #ifndef CLIB_MARCH_VARIANT
1424 static int
1425 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1426 {
1427   ip4_rehash_cb_ctx *ctx = _ctx;
1428   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1429     {
1430       ctx->failure = 1;
1431     }
1432   return (BIHASH_WALK_CONTINUE);
1433 }
1434
1435 static void
1436 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1437                            u32 max_reassembly_length,
1438                            u32 expire_walk_interval_ms)
1439 {
1440   ip4_full_reass_main.timeout_ms = timeout_ms;
1441   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1442   ip4_full_reass_main.max_reass_n = max_reassemblies;
1443   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1444   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1445 }
1446
1447 vnet_api_error_t
1448 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1449                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1450 {
1451   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1452   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1453                              max_reassembly_length, expire_walk_interval_ms);
1454   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1455                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1456                              IP4_EVENT_CONFIG_CHANGED, 0);
1457   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1458   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1459     {
1460       clib_bihash_16_8_t new_hash;
1461       clib_memset (&new_hash, 0, sizeof (new_hash));
1462       ip4_rehash_cb_ctx ctx;
1463       ctx.failure = 0;
1464       ctx.new_hash = &new_hash;
1465       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1466                              new_nbuckets * 1024);
1467       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1468                                                ip4_rehash_cb, &ctx);
1469       if (ctx.failure)
1470         {
1471           clib_bihash_free_16_8 (&new_hash);
1472           return -1;
1473         }
1474       else
1475         {
1476           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1477           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1478                             sizeof (ip4_full_reass_main.hash));
1479           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1480         }
1481     }
1482   return 0;
1483 }
1484
1485 vnet_api_error_t
1486 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1487                     u32 * max_reassembly_length,
1488                     u32 * expire_walk_interval_ms)
1489 {
1490   *timeout_ms = ip4_full_reass_main.timeout_ms;
1491   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1492   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1493   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1494   return 0;
1495 }
1496
1497 static clib_error_t *
1498 ip4_full_reass_init_function (vlib_main_t * vm)
1499 {
1500   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1501   clib_error_t *error = 0;
1502   u32 nbuckets;
1503   vlib_node_t *node;
1504
1505   rm->vlib_main = vm;
1506
1507   vec_validate (rm->per_thread_data, vlib_num_workers ());
1508   ip4_full_reass_per_thread_t *rt;
1509   vec_foreach (rt, rm->per_thread_data)
1510   {
1511     clib_spinlock_init (&rt->lock);
1512     pool_alloc (rt->pool, rm->max_reass_n);
1513   }
1514
1515   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1516   ASSERT (node);
1517   rm->ip4_full_reass_expire_node_idx = node->index;
1518
1519   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1520                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1521                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1522                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1523
1524   nbuckets = ip4_full_reass_get_nbuckets ();
1525   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1526
1527   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1528   ASSERT (node);
1529   rm->ip4_drop_idx = node->index;
1530
1531   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1532   rm->fq_feature_index =
1533     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1534   rm->fq_custom_index =
1535     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1536
1537   rm->feature_use_refcount_per_intf = NULL;
1538   return error;
1539 }
1540
1541 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1542 #endif /* CLIB_MARCH_VARIANT */
1543
1544 static uword
1545 ip4_full_reass_walk_expired (vlib_main_t * vm,
1546                              vlib_node_runtime_t * node, vlib_frame_t * f)
1547 {
1548   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1549   uword event_type, *event_data = 0;
1550
1551   while (true)
1552     {
1553       vlib_process_wait_for_event_or_clock (vm,
1554                                             (f64)
1555                                             rm->expire_walk_interval_ms /
1556                                             (f64) MSEC_PER_SEC);
1557       event_type = vlib_process_get_events (vm, &event_data);
1558
1559       switch (event_type)
1560         {
1561         case ~0:                /* no events => timeout */
1562           /* nothing to do here */
1563           break;
1564         case IP4_EVENT_CONFIG_CHANGED:
1565           break;
1566         default:
1567           clib_warning ("BUG: event type 0x%wx", event_type);
1568           break;
1569         }
1570       f64 now = vlib_time_now (vm);
1571
1572       ip4_full_reass_t *reass;
1573       int *pool_indexes_to_free = NULL;
1574
1575       uword thread_index = 0;
1576       int index;
1577       const uword nthreads = vlib_num_workers () + 1;
1578       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1579         {
1580           ip4_full_reass_per_thread_t *rt =
1581             &rm->per_thread_data[thread_index];
1582           clib_spinlock_lock (&rt->lock);
1583
1584           vec_reset_length (pool_indexes_to_free);
1585           /* *INDENT-OFF* */
1586           pool_foreach_index (index, rt->pool)  {
1587                                 reass = pool_elt_at_index (rt->pool, index);
1588                                 if (now > reass->last_heard + rm->timeout)
1589                                   {
1590                                     vec_add1 (pool_indexes_to_free, index);
1591                                   }
1592                               }
1593           /* *INDENT-ON* */
1594           int *i;
1595           /* *INDENT-OFF* */
1596           vec_foreach (i, pool_indexes_to_free)
1597           {
1598             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1599             ip4_full_reass_drop_all (vm, node, rm, reass);
1600             ip4_full_reass_free (rm, rt, reass);
1601           }
1602           /* *INDENT-ON* */
1603
1604           clib_spinlock_unlock (&rt->lock);
1605         }
1606
1607       vec_free (pool_indexes_to_free);
1608       if (event_data)
1609         {
1610           _vec_len (event_data) = 0;
1611         }
1612     }
1613
1614   return 0;
1615 }
1616
1617 /* *INDENT-OFF* */
1618 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1619     .function = ip4_full_reass_walk_expired,
1620     .type = VLIB_NODE_TYPE_PROCESS,
1621     .name = "ip4-full-reassembly-expire-walk",
1622     .format_trace = format_ip4_full_reass_trace,
1623     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1624     .error_strings = ip4_full_reass_error_strings,
1625
1626 };
1627 /* *INDENT-ON* */
1628
1629 static u8 *
1630 format_ip4_full_reass_key (u8 * s, va_list * args)
1631 {
1632   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1633   s =
1634     format (s,
1635             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1636             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1637             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1638   return s;
1639 }
1640
1641 static u8 *
1642 format_ip4_reass (u8 * s, va_list * args)
1643 {
1644   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1645   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1646
1647   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1648               "last_packet_octet: %u, trace_op_counter: %u\n",
1649               reass->id, format_ip4_full_reass_key, &reass->key,
1650               reass->first_bi, reass->data_len,
1651               reass->last_packet_octet, reass->trace_op_counter);
1652
1653   u32 bi = reass->first_bi;
1654   u32 counter = 0;
1655   while (~0 != bi)
1656     {
1657       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1658       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1659       s =
1660         format (s,
1661                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1662                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1663                 vnb->ip.reass.range_last, bi,
1664                 ip4_full_reass_buffer_get_data_offset (b),
1665                 ip4_full_reass_buffer_get_data_len (b),
1666                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1667       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1668         {
1669           bi = b->next_buffer;
1670         }
1671       else
1672         {
1673           bi = ~0;
1674         }
1675     }
1676   return s;
1677 }
1678
1679 static clib_error_t *
1680 show_ip4_reass (vlib_main_t * vm,
1681                 unformat_input_t * input,
1682                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1683 {
1684   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1685
1686   vlib_cli_output (vm, "---------------------");
1687   vlib_cli_output (vm, "IP4 reassembly status");
1688   vlib_cli_output (vm, "---------------------");
1689   bool details = false;
1690   if (unformat (input, "details"))
1691     {
1692       details = true;
1693     }
1694
1695   u32 sum_reass_n = 0;
1696   ip4_full_reass_t *reass;
1697   uword thread_index;
1698   const uword nthreads = vlib_num_workers () + 1;
1699   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1700     {
1701       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1702       clib_spinlock_lock (&rt->lock);
1703       if (details)
1704         {
1705           /* *INDENT-OFF* */
1706           pool_foreach (reass, rt->pool) {
1707             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1708           }
1709           /* *INDENT-ON* */
1710         }
1711       sum_reass_n += rt->reass_n;
1712       clib_spinlock_unlock (&rt->lock);
1713     }
1714   vlib_cli_output (vm, "---------------------");
1715   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1716                    (long unsigned) sum_reass_n);
1717   vlib_cli_output (vm,
1718                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1719                    (long unsigned) rm->max_reass_n);
1720   vlib_cli_output (vm,
1721                    "Maximum configured amount of fragments "
1722                    "per full IP4 reassembly: %lu\n",
1723                    (long unsigned) rm->max_reass_len);
1724   vlib_cli_output (vm,
1725                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1726                    (long unsigned) rm->timeout_ms);
1727   vlib_cli_output (vm,
1728                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1729                    (long unsigned) rm->expire_walk_interval_ms);
1730   return 0;
1731 }
1732
1733 /* *INDENT-OFF* */
1734 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1735     .path = "show ip4-full-reassembly",
1736     .short_help = "show ip4-full-reassembly [details]",
1737     .function = show_ip4_reass,
1738 };
1739 /* *INDENT-ON* */
1740
1741 #ifndef CLIB_MARCH_VARIANT
1742 vnet_api_error_t
1743 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1744 {
1745   return vnet_feature_enable_disable ("ip4-unicast",
1746                                       "ip4-full-reassembly-feature",
1747                                       sw_if_index, enable_disable, 0, 0);
1748 }
1749 #endif /* CLIB_MARCH_VARIANT */
1750
1751
1752 #define foreach_ip4_full_reass_handoff_error                       \
1753 _(CONGESTION_DROP, "congestion drop")
1754
1755
1756 typedef enum
1757 {
1758 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1759   foreach_ip4_full_reass_handoff_error
1760 #undef _
1761     IP4_FULL_REASS_HANDOFF_N_ERROR,
1762 } ip4_full_reass_handoff_error_t;
1763
1764 static char *ip4_full_reass_handoff_error_strings[] = {
1765 #define _(sym,string) string,
1766   foreach_ip4_full_reass_handoff_error
1767 #undef _
1768 };
1769
1770 typedef struct
1771 {
1772   u32 next_worker_index;
1773 } ip4_full_reass_handoff_trace_t;
1774
1775 static u8 *
1776 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1777 {
1778   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1779   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1780   ip4_full_reass_handoff_trace_t *t =
1781     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1782
1783   s =
1784     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1785             t->next_worker_index);
1786
1787   return s;
1788 }
1789
1790 always_inline uword
1791 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1792                                     vlib_node_runtime_t * node,
1793                                     vlib_frame_t * frame,
1794                                     ip4_full_reass_node_type_t type)
1795 {
1796   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1797
1798   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1799   u32 n_enq, n_left_from, *from;
1800   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1801   u32 fq_index;
1802
1803   from = vlib_frame_vector_args (frame);
1804   n_left_from = frame->n_vectors;
1805   vlib_get_buffers (vm, from, bufs, n_left_from);
1806
1807   b = bufs;
1808   ti = thread_indices;
1809
1810   switch (type)
1811     {
1812     case NORMAL:
1813       fq_index = rm->fq_index;
1814       break;
1815     case FEATURE:
1816       fq_index = rm->fq_feature_index;
1817       break;
1818     case CUSTOM:
1819       fq_index = rm->fq_custom_index;
1820       break;
1821     default:
1822       clib_warning ("Unexpected `type' (%d)!", type);
1823       ASSERT (0);
1824     }
1825
1826   while (n_left_from > 0)
1827     {
1828       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1829
1830       if (PREDICT_FALSE
1831           ((node->flags & VLIB_NODE_FLAG_TRACE)
1832            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1833         {
1834           ip4_full_reass_handoff_trace_t *t =
1835             vlib_add_trace (vm, node, b[0], sizeof (*t));
1836           t->next_worker_index = ti[0];
1837         }
1838
1839       n_left_from -= 1;
1840       ti += 1;
1841       b += 1;
1842     }
1843   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1844                                          thread_indices, frame->n_vectors, 1);
1845
1846   if (n_enq < frame->n_vectors)
1847     vlib_node_increment_counter (vm, node->node_index,
1848                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1849                                  frame->n_vectors - n_enq);
1850   return frame->n_vectors;
1851 }
1852
1853 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1854                                             vlib_node_runtime_t * node,
1855                                             vlib_frame_t * frame)
1856 {
1857   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
1858 }
1859
1860
1861 /* *INDENT-OFF* */
1862 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1863   .name = "ip4-full-reassembly-handoff",
1864   .vector_size = sizeof (u32),
1865   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1866   .error_strings = ip4_full_reass_handoff_error_strings,
1867   .format_trace = format_ip4_full_reass_handoff_trace,
1868
1869   .n_next_nodes = 1,
1870
1871   .next_nodes = {
1872     [0] = "error-drop",
1873   },
1874 };
1875 /* *INDENT-ON* */
1876
1877
1878 /* *INDENT-OFF* */
1879 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1880                                                     vlib_node_runtime_t *
1881                                                     node,
1882                                                     vlib_frame_t * frame)
1883 {
1884   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
1885 }
1886 /* *INDENT-ON* */
1887
1888
1889 /* *INDENT-OFF* */
1890 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1891   .name = "ip4-full-reass-feature-hoff",
1892   .vector_size = sizeof (u32),
1893   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1894   .error_strings = ip4_full_reass_handoff_error_strings,
1895   .format_trace = format_ip4_full_reass_handoff_trace,
1896
1897   .n_next_nodes = 1,
1898
1899   .next_nodes = {
1900     [0] = "error-drop",
1901   },
1902 };
1903 /* *INDENT-ON* */
1904
1905 /* *INDENT-OFF* */
1906 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1907                                                     vlib_node_runtime_t *
1908                                                     node,
1909                                                     vlib_frame_t * frame)
1910 {
1911   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
1912 }
1913 /* *INDENT-ON* */
1914
1915
1916 /* *INDENT-OFF* */
1917 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1918   .name = "ip4-full-reass-custom-hoff",
1919   .vector_size = sizeof (u32),
1920   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1921   .error_strings = ip4_full_reass_handoff_error_strings,
1922   .format_trace = format_ip4_full_reass_handoff_trace,
1923
1924   .n_next_nodes = 1,
1925
1926   .next_nodes = {
1927     [0] = "error-drop",
1928   },
1929 };
1930 /* *INDENT-ON* */
1931
1932 #ifndef CLIB_MARCH_VARIANT
1933 int
1934 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1935 {
1936   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1937   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1938   if (is_enable)
1939     {
1940       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1941         {
1942           ++rm->feature_use_refcount_per_intf[sw_if_index];
1943           return vnet_feature_enable_disable ("ip4-unicast",
1944                                               "ip4-full-reassembly-feature",
1945                                               sw_if_index, 1, 0, 0);
1946         }
1947       ++rm->feature_use_refcount_per_intf[sw_if_index];
1948     }
1949   else
1950     {
1951       --rm->feature_use_refcount_per_intf[sw_if_index];
1952       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1953         return vnet_feature_enable_disable ("ip4-unicast",
1954                                             "ip4-full-reassembly-feature",
1955                                             sw_if_index, 0, 0, 0);
1956     }
1957   return -1;
1958 }
1959 #endif
1960
1961 /*
1962  * fd.io coding-style-patch-verification: ON
1963  *
1964  * Local Variables:
1965  * eval: (c-set-style "gnu")
1966  * End:
1967  */