src/vnet/ip/reass/ip4_full_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv4 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv4 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/fifo.h>
  27 #include <vppinfra/bihash_16_8.h>
  28 #include <vnet/ip/reass/ip4_full_reass.h>
  29 #include <stddef.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_REASS_TIMEOUT_DEFAULT_MS              100
  33 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  34 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT   3
  36 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 #define IP4_REASS_DEBUG_BUFFERS 0
  39 #if IP4_REASS_DEBUG_BUFFERS
  40 #define IP4_REASS_DEBUG_BUFFER(bi, what)             \
  41   do                                                 \
  42     {                                                \
  43       u32 _bi = bi;                                  \
  44       printf (#what "buffer %u", _bi);               \
  45       vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
  46       while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)   \
  47         {                                            \
  48           _bi = _b->next_buffer;                     \
  49           printf ("[%u]", _bi);                      \
  50           _b = vlib_get_buffer (vm, _bi);            \
  51         }                                            \
  52       printf ("\n");                                 \
  53       fflush (stdout);                               \
  54     }                                                \
  55   while (0)
  56 #else
  57 #define IP4_REASS_DEBUG_BUFFER(...)
  58 #endif
  59
  60 typedef enum
  61 {
  62   IP4_REASS_RC_OK,
  63   IP4_REASS_RC_TOO_MANY_FRAGMENTS,
  64   IP4_REASS_RC_INTERNAL_ERROR,
  65   IP4_REASS_RC_NO_BUF,
  66   IP4_REASS_RC_HANDOFF,
  67 } ip4_full_reass_rc_t;
  68
  69 typedef struct
  70 {
  71   union
  72   {
  73     struct
  74     {
  75       u32 xx_id;
  76       ip4_address_t src;
  77       ip4_address_t dst;
  78       u16 frag_id;
  79       u8 proto;
  80       u8 unused;
  81     };
  82     u64 as_u64[2];
  83   };
  84 } ip4_full_reass_key_t;
  85
  86 typedef union
  87 {
  88   struct
  89   {
  90     u32 reass_index;
  91     u32 memory_owner_thread_index;
  92   };
  93   u64 as_u64;
  94 } ip4_full_reass_val_t;
  95
  96 typedef union
  97 {
  98   struct
  99   {
 100     ip4_full_reass_key_t k;
 101     ip4_full_reass_val_t v;
 102   };
 103   clib_bihash_kv_16_8_t kv;
 104 } ip4_full_reass_kv_t;
 105
 106 always_inline u32
 107 ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
 108 {
 109   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 110   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
 111 }
 112
 113 always_inline u16
 114 ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
 115 {
 116   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 117   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 118     (vnb->ip.reass.fragment_first +
 119      ip4_full_reass_buffer_get_data_offset (b)) + 1;
 120 }
 121
 122 typedef struct
 123 {
 124   // hash table key
 125   ip4_full_reass_key_t key;
 126   // time when last packet was received
 127   f64 last_heard;
 128   // internal id of this reassembly
 129   u64 id;
 130   // buffer index of first buffer in this reassembly context
 131   u32 first_bi;
 132   // last octet of packet, ~0 until fragment without more_fragments arrives
 133   u32 last_packet_octet;
 134   // length of data collected so far
 135   u32 data_len;
 136   // trace operation counter
 137   u32 trace_op_counter;
 138   // next index - used by non-feature node
 139   u32 next_index;
 140   // error next index - used by custom apps (~0 if not used)
 141   u32 error_next_index;
 142   // minimum fragment length for this reassembly - used to estimate MTU
 143   u16 min_fragment_length;
 144   // number of fragments in this reassembly
 145   u32 fragments_n;
 146   // thread owning memory for this context (whose pool contains this ctx)
 147   u32 memory_owner_thread_index;
 148   // thread which received fragment with offset 0 and which sends out the
 149   // completed reassembly
 150   u32 sendout_thread_index;
 151 } ip4_full_reass_t;
 152
 153 typedef struct
 154 {
 155   ip4_full_reass_t *pool;
 156   u32 reass_n;
 157   u32 id_counter;
 158   clib_spinlock_t lock;
 159 } ip4_full_reass_per_thread_t;
 160
 161 typedef struct
 162 {
 163   // IPv4 config
 164   u32 timeout_ms;
 165   f64 timeout;
 166   u32 expire_walk_interval_ms;
 167   // maximum number of fragments in one reassembly
 168   u32 max_reass_len;
 169   // maximum number of reassemblies
 170   u32 max_reass_n;
 171
 172   // IPv4 runtime
 173   clib_bihash_16_8_t hash;
 174   // per-thread data
 175   ip4_full_reass_per_thread_t *per_thread_data;
 176
 177   // convenience
 178   vlib_main_t *vlib_main;
 179
 180   u32 ip4_full_reass_expire_node_idx;
 181
 182   /** Worker handoff */
 183   u32 fq_index;
 184   u32 fq_local_index;
 185   u32 fq_feature_index;
 186   u32 fq_custom_index;
 187
 188   // reference count for enabling/disabling feature - per interface
 189   u32 *feature_use_refcount_per_intf;
 190
 191   // whether local fragmented packets are reassembled or not
 192   int is_local_reass_enabled;
 193 } ip4_full_reass_main_t;
 194
 195 extern ip4_full_reass_main_t ip4_full_reass_main;
 196
 197 #ifndef CLIB_MARCH_VARIANT
 198 ip4_full_reass_main_t ip4_full_reass_main;
 199 #endif /* CLIB_MARCH_VARIANT */
 200
 201 typedef enum
 202 {
 203   IP4_FULL_REASS_NEXT_INPUT,
 204   IP4_FULL_REASS_NEXT_DROP,
 205   IP4_FULL_REASS_NEXT_HANDOFF,
 206   IP4_FULL_REASS_N_NEXT,
 207 } ip4_full_reass_next_t;
 208
 209 typedef enum
 210 {
 211   NORMAL,
 212   FEATURE,
 213   CUSTOM
 214 } ip4_full_reass_node_type_t;
 215
 216 typedef enum
 217 {
 218   RANGE_NEW,
 219   RANGE_SHRINK,
 220   RANGE_DISCARD,
 221   RANGE_OVERLAP,
 222   FINALIZE,
 223   HANDOFF,
 224   PASSTHROUGH,
 225 } ip4_full_reass_trace_operation_e;
 226
 227 typedef struct
 228 {
 229   u16 range_first;
 230   u16 range_last;
 231   u32 range_bi;
 232   i32 data_offset;
 233   u32 data_len;
 234   u32 first_bi;
 235 } ip4_full_reass_range_trace_t;
 236
 237 typedef struct
 238 {
 239   ip4_full_reass_trace_operation_e action;
 240   u32 reass_id;
 241   ip4_full_reass_range_trace_t trace_range;
 242   u32 size_diff;
 243   u32 op_id;
 244   u32 thread_id;
 245   u32 thread_id_to;
 246   u32 fragment_first;
 247   u32 fragment_last;
 248   u32 total_data_len;
 249   bool is_after_handoff;
 250   ip4_header_t ip4_header;
 251 } ip4_full_reass_trace_t;
 252
 253 extern vlib_node_registration_t ip4_full_reass_node;
 254 extern vlib_node_registration_t ip4_full_reass_node_feature;
 255 extern vlib_node_registration_t ip4_full_reass_node_custom;
 256
 257 static void
 258 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 259                               ip4_full_reass_range_trace_t * trace)
 260 {
 261   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 262   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 263   trace->range_first = vnb->ip.reass.range_first;
 264   trace->range_last = vnb->ip.reass.range_last;
 265   trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
 266   trace->data_len = ip4_full_reass_buffer_get_data_len (b);
 267   trace->range_bi = bi;
 268 }
 269
 270 static u8 *
 271 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
 272 {
 273   ip4_full_reass_range_trace_t *trace =
 274     va_arg (*args, ip4_full_reass_range_trace_t *);
 275   s =
 276     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 277             trace->range_last, trace->data_offset, trace->data_len,
 278             trace->range_bi);
 279   return s;
 280 }
 281
 282 static u8 *
 283 format_ip4_full_reass_trace (u8 * s, va_list * args)
 284 {
 285   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 286   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 287   ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
 288   u32 indent = 0;
 289   if (~0 != t->reass_id)
 290     {
 291       if (t->is_after_handoff)
 292         {
 293           s =
 294             format (s, "%U\n", format_ip4_header, &t->ip4_header,
 295                     sizeof (t->ip4_header));
 296           indent = 2;
 297         }
 298       s =
 299         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 300                 t->reass_id, t->op_id);
 301       indent = format_get_indent (s);
 302       s =
 303         format (s,
 304                 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 305                 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 306                 t->fragment_last);
 307     }
 308   switch (t->action)
 309     {
 310     case RANGE_SHRINK:
 311       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 312                   format_ip4_full_reass_range_trace, &t->trace_range,
 313                   t->size_diff);
 314       break;
 315     case RANGE_DISCARD:
 316       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 317                   format_ip4_full_reass_range_trace, &t->trace_range);
 318       break;
 319     case RANGE_NEW:
 320       s = format (s, "\n%Unew %U", format_white_space, indent,
 321                   format_ip4_full_reass_range_trace, &t->trace_range);
 322       break;
 323     case RANGE_OVERLAP:
 324       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 325                   format_ip4_full_reass_range_trace, &t->trace_range);
 326       break;
 327     case FINALIZE:
 328       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 329       break;
 330     case HANDOFF:
 331       s =
 332         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 333                 t->thread_id_to);
 334       break;
 335     case PASSTHROUGH:
 336       s = format (s, "passthrough - not a fragment");
 337       break;
 338     }
 339   return s;
 340 }
 341
 342 static void
 343 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 344                           ip4_full_reass_t * reass, u32 bi,
 345                           ip4_full_reass_trace_operation_e action,
 346                           u32 size_diff, u32 thread_id_to)
 347 {
 348   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 349   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 350   if (pool_is_free_index
 351       (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
 352     {
 353       // this buffer's trace is gone
 354       b->flags &= ~VLIB_BUFFER_IS_TRACED;
 355       return;
 356     }
 357   bool is_after_handoff = false;
 358   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 359     {
 360       is_after_handoff = true;
 361     }
 362   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 363   t->is_after_handoff = is_after_handoff;
 364   if (t->is_after_handoff)
 365     {
 366       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 367                    clib_min (sizeof (t->ip4_header), b->current_length));
 368     }
 369   if (reass)
 370     {
 371       t->reass_id = reass->id;
 372       t->op_id = reass->trace_op_counter;
 373       t->trace_range.first_bi = reass->first_bi;
 374       t->total_data_len = reass->data_len;
 375       ++reass->trace_op_counter;
 376     }
 377   else
 378     {
 379       t->reass_id = ~0;
 380       t->op_id = 0;
 381       t->trace_range.first_bi = 0;
 382       t->total_data_len = 0;
 383     }
 384   t->action = action;
 385   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 386   t->size_diff = size_diff;
 387   t->thread_id = vm->thread_index;
 388   t->thread_id_to = thread_id_to;
 389   t->fragment_first = vnb->ip.reass.fragment_first;
 390   t->fragment_last = vnb->ip.reass.fragment_last;
 391 #if 0
 392   static u8 *s = NULL;
 393   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 394   printf ("%.*s\n", vec_len (s), s);
 395   fflush (stdout);
 396   vec_reset_length (s);
 397 #endif
 398 }
 399
 400 always_inline void
 401 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 402                          ip4_full_reass_t * reass)
 403 {
 404   pool_put (rt->pool, reass);
 405   --rt->reass_n;
 406 }
 407
 408 always_inline void
 409 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 410                      ip4_full_reass_per_thread_t * rt,
 411                      ip4_full_reass_t * reass)
 412 {
 413   clib_bihash_kv_16_8_t kv;
 414   kv.key[0] = reass->key.as_u64[0];
 415   kv.key[1] = reass->key.as_u64[1];
 416   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 417   return ip4_full_reass_free_ctx (rt, reass);
 418 }
 419
 420 /* n_left_to_next, and to_next are taken as input params, as this function
 421  * could be called from a graphnode, where its managing local copy of these
 422  * variables, and ignoring those and still trying to enqueue the buffers
 423  * with local variables would cause either buffer leak or corruption */
 424 always_inline void
 425 ip4_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
 426                          ip4_full_reass_t *reass, u32 *n_left_to_next,
 427                          u32 **to_next)
 428 {
 429   u32 range_bi = reass->first_bi;
 430   vlib_buffer_t *range_b;
 431   vnet_buffer_opaque_t *range_vnb;
 432   u32 *to_free = NULL;
 433
 434   while (~0 != range_bi)
 435     {
 436       range_b = vlib_get_buffer (vm, range_bi);
 437       range_vnb = vnet_buffer (range_b);
 438
 439       if (~0 != range_bi)
 440         {
 441           vec_add1 (to_free, range_bi);
 442         }
 443
 444       range_bi = range_vnb->ip.reass.next_range_bi;
 445     }
 446
 447   /* send to next_error_index */
 448   if (~0 != reass->error_next_index &&
 449       reass->error_next_index < node->n_next_nodes)
 450     {
 451       u32 next_index;
 452
 453       next_index = reass->error_next_index;
 454       u32 bi = ~0;
 455
 456       while (vec_len (to_free) > 0)
 457         {
 458           vlib_get_next_frame (vm, node, next_index, *to_next,
 459                                (*n_left_to_next));
 460
 461           while (vec_len (to_free) > 0 && (*n_left_to_next) > 0)
 462             {
 463               bi = vec_pop (to_free);
 464
 465               if (~0 != bi)
 466                 {
 467                   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 468                   if ((b->flags & VLIB_BUFFER_IS_TRACED))
 469                     {
 470                       ip4_full_reass_add_trace (vm, node, reass, bi,
 471                                                 RANGE_DISCARD, 0, ~0);
 472                     }
 473                   *to_next[0] = bi;
 474                   (*to_next) += 1;
 475                   (*n_left_to_next) -= 1;
 476                 }
 477             }
 478           vlib_put_next_frame (vm, node, next_index, (*n_left_to_next));
 479         }
 480     }
 481   else
 482     {
 483       vlib_buffer_free (vm, to_free, vec_len (to_free));
 484     }
 485   vec_free (to_free);
 486 }
 487
 488 always_inline void
 489 sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip4_full_reass_t *reass,
 490                                     u32 *bi0)
 491 {
 492   u32 range_bi = reass->first_bi;
 493   vlib_buffer_t *range_b;
 494   vnet_buffer_opaque_t *range_vnb;
 495
 496   while (~0 != range_bi)
 497     {
 498       range_b = vlib_get_buffer (vm, range_bi);
 499       range_vnb = vnet_buffer (range_b);
 500       u32 bi = range_bi;
 501       if (~0 != bi)
 502         {
 503           if (bi == *bi0)
 504             *bi0 = ~0;
 505           if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 506             {
 507               u32 _bi = bi;
 508               vlib_buffer_t *_b = vlib_get_buffer (vm, _bi);
 509               while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 510                 {
 511                   if (_b->next_buffer != range_vnb->ip.reass.next_range_bi)
 512                     {
 513                       _bi = _b->next_buffer;
 514                       _b = vlib_get_buffer (vm, _bi);
 515                     }
 516                   else
 517                     {
 518                       _b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 519                       break;
 520                     }
 521                 }
 522             }
 523           range_bi = range_vnb->ip.reass.next_range_bi;
 524         }
 525     }
 526   if (*bi0 != ~0)
 527     {
 528       vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 529       vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 530       if (~0 != reass->first_bi)
 531         {
 532           fvnb->ip.reass.next_range_bi = reass->first_bi;
 533           reass->first_bi = *bi0;
 534         }
 535       else
 536         {
 537           reass->first_bi = *bi0;
 538           fvnb->ip.reass.next_range_bi = ~0;
 539         }
 540       *bi0 = ~0;
 541     }
 542 }
 543
 544 always_inline void
 545 ip4_full_reass_init (ip4_full_reass_t * reass)
 546 {
 547   reass->first_bi = ~0;
 548   reass->last_packet_octet = ~0;
 549   reass->data_len = 0;
 550   reass->next_index = ~0;
 551   reass->error_next_index = ~0;
 552 }
 553
 554 always_inline ip4_full_reass_t *
 555 ip4_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
 556                                ip4_full_reass_main_t *rm,
 557                                ip4_full_reass_per_thread_t *rt,
 558                                ip4_full_reass_kv_t *kv, u8 *do_handoff,
 559                                u32 *n_left_to_next, u32 **to_next)
 560 {
 561   ip4_full_reass_t *reass;
 562   f64 now;
 563
 564 again:
 565
 566   reass = NULL;
 567   now = vlib_time_now (vm);
 568   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 569     {
 570       if (vm->thread_index != kv->v.memory_owner_thread_index)
 571         {
 572           *do_handoff = 1;
 573           return NULL;
 574         }
 575       reass =
 576         pool_elt_at_index (rm->per_thread_data
 577                            [kv->v.memory_owner_thread_index].pool,
 578                            kv->v.reass_index);
 579
 580       if (now > reass->last_heard + rm->timeout)
 581         {
 582           ip4_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next);
 583           ip4_full_reass_free (rm, rt, reass);
 584           reass = NULL;
 585         }
 586     }
 587
 588   if (reass)
 589     {
 590       reass->last_heard = now;
 591       return reass;
 592     }
 593
 594   if (rt->reass_n >= rm->max_reass_n)
 595     {
 596       reass = NULL;
 597       return reass;
 598     }
 599   else
 600     {
 601       pool_get (rt->pool, reass);
 602       clib_memset (reass, 0, sizeof (*reass));
 603       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 604       reass->memory_owner_thread_index = vm->thread_index;
 605       ++rt->id_counter;
 606       ip4_full_reass_init (reass);
 607       ++rt->reass_n;
 608     }
 609
 610   reass->key.as_u64[0] = kv->kv.key[0];
 611   reass->key.as_u64[1] = kv->kv.key[1];
 612   kv->v.reass_index = (reass - rt->pool);
 613   kv->v.memory_owner_thread_index = vm->thread_index;
 614   reass->last_heard = now;
 615
 616   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 617   if (rv)
 618     {
 619       ip4_full_reass_free_ctx (rt, reass);
 620       reass = NULL;
 621       // if other worker created a context already work with the other copy
 622       if (-2 == rv)
 623         goto again;
 624     }
 625
 626   return reass;
 627 }
 628
 629 always_inline ip4_full_reass_rc_t
 630 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 631                          ip4_full_reass_main_t * rm,
 632                          ip4_full_reass_per_thread_t * rt,
 633                          ip4_full_reass_t * reass, u32 * bi0,
 634                          u32 * next0, u32 * error0, bool is_custom)
 635 {
 636   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 637   vlib_buffer_t *last_b = NULL;
 638   u32 sub_chain_bi = reass->first_bi;
 639   u32 total_length = 0;
 640   u32 buf_cnt = 0;
 641   do
 642     {
 643       u32 tmp_bi = sub_chain_bi;
 644       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 645       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 646       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 647       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 648           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 649         {
 650           return IP4_REASS_RC_INTERNAL_ERROR;
 651         }
 652
 653       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 654       u32 trim_front =
 655         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 656       u32 trim_end =
 657         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 658       if (tmp_bi == reass->first_bi)
 659         {
 660           /* first buffer - keep ip4 header */
 661           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 662             {
 663               return IP4_REASS_RC_INTERNAL_ERROR;
 664             }
 665           trim_front = 0;
 666           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 667             ip4_header_bytes (ip);
 668           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 669             {
 670               return IP4_REASS_RC_INTERNAL_ERROR;
 671             }
 672         }
 673       u32 keep_data =
 674         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 675       while (1)
 676         {
 677           ++buf_cnt;
 678           if (trim_front)
 679             {
 680               if (trim_front > tmp->current_length)
 681                 {
 682                   /* drop whole buffer */
 683                   u32 to_be_freed_bi = tmp_bi;
 684                   trim_front -= tmp->current_length;
 685                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 686                     {
 687                       return IP4_REASS_RC_INTERNAL_ERROR;
 688                     }
 689                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 690                   tmp_bi = tmp->next_buffer;
 691                   tmp->next_buffer = 0;
 692                   tmp = vlib_get_buffer (vm, tmp_bi);
 693                   vlib_buffer_free_one (vm, to_be_freed_bi);
 694                   continue;
 695                 }
 696               else
 697                 {
 698                   vlib_buffer_advance (tmp, trim_front);
 699                   trim_front = 0;
 700                 }
 701             }
 702           if (keep_data)
 703             {
 704               if (last_b)
 705                 {
 706                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 707                   last_b->next_buffer = tmp_bi;
 708                 }
 709               last_b = tmp;
 710               if (keep_data <= tmp->current_length)
 711                 {
 712                   tmp->current_length = keep_data;
 713                   keep_data = 0;
 714                 }
 715               else
 716                 {
 717                   keep_data -= tmp->current_length;
 718                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 719                     {
 720                       return IP4_REASS_RC_INTERNAL_ERROR;
 721                     }
 722                 }
 723               total_length += tmp->current_length;
 724               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 725                 {
 726                   tmp_bi = tmp->next_buffer;
 727                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 728                 }
 729               else
 730                 {
 731                   break;
 732                 }
 733             }
 734           else
 735             {
 736               u32 to_be_freed_bi = tmp_bi;
 737               if (reass->first_bi == tmp_bi)
 738                 {
 739                   return IP4_REASS_RC_INTERNAL_ERROR;
 740                 }
 741               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 742                 {
 743                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 744                   tmp_bi = tmp->next_buffer;
 745                   tmp->next_buffer = 0;
 746                   tmp = vlib_get_buffer (vm, tmp_bi);
 747                   vlib_buffer_free_one (vm, to_be_freed_bi);
 748                 }
 749               else
 750                 {
 751                   tmp->next_buffer = 0;
 752                   vlib_buffer_free_one (vm, to_be_freed_bi);
 753                   break;
 754                 }
 755             }
 756         }
 757       sub_chain_bi =
 758         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 759         reass.next_range_bi;
 760     }
 761   while (~0 != sub_chain_bi);
 762
 763   if (!last_b)
 764     {
 765       return IP4_REASS_RC_INTERNAL_ERROR;
 766     }
 767   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 768
 769   if (total_length < first_b->current_length)
 770     {
 771       return IP4_REASS_RC_INTERNAL_ERROR;
 772     }
 773   total_length -= first_b->current_length;
 774   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 775   first_b->total_length_not_including_first_buffer = total_length;
 776   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 777   ip->flags_and_fragment_offset = 0;
 778   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 779   ip->checksum = ip4_header_checksum (ip);
 780   if (!vlib_buffer_chain_linearize (vm, first_b))
 781     {
 782       return IP4_REASS_RC_NO_BUF;
 783     }
 784   // reset to reconstruct the mbuf linking
 785   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 786   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 787     {
 788       ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
 789                                 ~0);
 790 #if 0
 791       // following code does a hexdump of packet fragments to stdout ...
 792       do
 793         {
 794           u32 bi = reass->first_bi;
 795           u8 *s = NULL;
 796           while (~0 != bi)
 797             {
 798               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 799               s = format (s, "%u: %U\n", bi, format_hexdump,
 800                           vlib_buffer_get_current (b), b->current_length);
 801               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 802                 {
 803                   bi = b->next_buffer;
 804                 }
 805               else
 806                 {
 807                   break;
 808                 }
 809             }
 810           printf ("%.*s\n", vec_len (s), s);
 811           fflush (stdout);
 812           vec_free (s);
 813         }
 814       while (0);
 815 #endif
 816     }
 817   *bi0 = reass->first_bi;
 818   if (!is_custom)
 819     {
 820       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 821     }
 822   else
 823     {
 824       *next0 = reass->next_index;
 825     }
 826   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 827
 828   *error0 = IP4_ERROR_NONE;
 829   ip4_full_reass_free (rm, rt, reass);
 830   reass = NULL;
 831   return IP4_REASS_RC_OK;
 832 }
 833
 834 always_inline ip4_full_reass_rc_t
 835 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 836                                       ip4_full_reass_t * reass,
 837                                       u32 prev_range_bi, u32 new_next_bi)
 838 {
 839   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 840   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 841   if (~0 != prev_range_bi)
 842     {
 843       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 844       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 845       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 846       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 847     }
 848   else
 849     {
 850       if (~0 != reass->first_bi)
 851         {
 852           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 853         }
 854       reass->first_bi = new_next_bi;
 855     }
 856   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 857   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 858       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 859     {
 860       return IP4_REASS_RC_INTERNAL_ERROR;
 861     }
 862   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 863   return IP4_REASS_RC_OK;
 864 }
 865
 866 always_inline ip4_full_reass_rc_t
 867 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 868                                         vlib_node_runtime_t * node,
 869                                         ip4_full_reass_t * reass,
 870                                         u32 prev_range_bi, u32 discard_bi)
 871 {
 872   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 873   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 874   if (~0 != prev_range_bi)
 875     {
 876       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 877       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 878       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 879         {
 880           return IP4_REASS_RC_INTERNAL_ERROR;
 881         }
 882       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 883     }
 884   else
 885     {
 886       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 887     }
 888   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 889   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 890       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 891     {
 892       return IP4_REASS_RC_INTERNAL_ERROR;
 893     }
 894   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 895   while (1)
 896     {
 897       u32 to_be_freed_bi = discard_bi;
 898       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 899         {
 900           ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
 901                                     0, ~0);
 902         }
 903       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 904         {
 905           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 906           discard_bi = discard_b->next_buffer;
 907           discard_b->next_buffer = 0;
 908           discard_b = vlib_get_buffer (vm, discard_bi);
 909           vlib_buffer_free_one (vm, to_be_freed_bi);
 910         }
 911       else
 912         {
 913           discard_b->next_buffer = 0;
 914           vlib_buffer_free_one (vm, to_be_freed_bi);
 915           break;
 916         }
 917     }
 918   return IP4_REASS_RC_OK;
 919 }
 920
 921 always_inline ip4_full_reass_rc_t
 922 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 923                        ip4_full_reass_main_t * rm,
 924                        ip4_full_reass_per_thread_t * rt,
 925                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 926                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 927 {
 928   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 929   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 930   if (is_custom)
 931     {
 932       // store (error_)next_index before it's overwritten
 933       reass->next_index = fvnb->ip.reass.next_index;
 934       reass->error_next_index = fvnb->ip.reass.error_next_index;
 935     }
 936   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 937   int consumed = 0;
 938   ip4_header_t *fip = vlib_buffer_get_current (fb);
 939   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 940   const u32 fragment_length =
 941     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 942   const u32 fragment_last = fragment_first + fragment_length - 1;
 943   fvnb->ip.reass.fragment_first = fragment_first;
 944   fvnb->ip.reass.fragment_last = fragment_last;
 945   int more_fragments = ip4_get_fragment_more (fip);
 946   u32 candidate_range_bi = reass->first_bi;
 947   u32 prev_range_bi = ~0;
 948   fvnb->ip.reass.range_first = fragment_first;
 949   fvnb->ip.reass.range_last = fragment_last;
 950   fvnb->ip.reass.next_range_bi = ~0;
 951   if (!more_fragments)
 952     {
 953       reass->last_packet_octet = fragment_last;
 954     }
 955   if (~0 == reass->first_bi)
 956     {
 957       // starting a new reassembly
 958       rc =
 959         ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 960       if (IP4_REASS_RC_OK != rc)
 961         {
 962           return rc;
 963         }
 964       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 965         {
 966           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
 967         }
 968       *bi0 = ~0;
 969       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 970       reass->fragments_n = 1;
 971       return IP4_REASS_RC_OK;
 972     }
 973   reass->min_fragment_length =
 974     clib_min (clib_net_to_host_u16 (fip->length),
 975               fvnb->ip.reass.estimated_mtu);
 976   while (~0 != candidate_range_bi)
 977     {
 978       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 979       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 980       if (fragment_first > candidate_vnb->ip.reass.range_last)
 981         {
 982           // this fragments starts after candidate range
 983           prev_range_bi = candidate_range_bi;
 984           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 985           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 986               ~0 == candidate_range_bi)
 987             {
 988               // special case - this fragment falls beyond all known ranges
 989               rc = ip4_full_reass_insert_range_in_chain (vm, reass,
 990                                                          prev_range_bi, *bi0);
 991               if (IP4_REASS_RC_OK != rc)
 992                 {
 993                   return rc;
 994                 }
 995               consumed = 1;
 996               break;
 997             }
 998           continue;
 999         }
1000       if (fragment_last < candidate_vnb->ip.reass.range_first)
1001         {
1002           // this fragment ends before candidate range without any overlap
1003           rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1004                                                      *bi0);
1005           if (IP4_REASS_RC_OK != rc)
1006             {
1007               return rc;
1008             }
1009           consumed = 1;
1010         }
1011       else
1012         {
1013           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
1014               fragment_last <= candidate_vnb->ip.reass.range_last)
1015             {
1016               // this fragment is a (sub)part of existing range, ignore it
1017               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1018                 {
1019                   ip4_full_reass_add_trace (vm, node, reass, *bi0,
1020                                             RANGE_OVERLAP, 0, ~0);
1021                 }
1022               break;
1023             }
1024           int discard_candidate = 0;
1025           if (fragment_first < candidate_vnb->ip.reass.range_first)
1026             {
1027               u32 overlap =
1028                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
1029               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1030                 {
1031                   candidate_vnb->ip.reass.range_first += overlap;
1032                   if (reass->data_len < overlap)
1033                     {
1034                       return IP4_REASS_RC_INTERNAL_ERROR;
1035                     }
1036                   reass->data_len -= overlap;
1037                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1038                     {
1039                       ip4_full_reass_add_trace (vm, node, reass,
1040                                                 candidate_range_bi,
1041                                                 RANGE_SHRINK, 0, ~0);
1042                     }
1043                   rc = ip4_full_reass_insert_range_in_chain (
1044                     vm, reass, prev_range_bi, *bi0);
1045                   if (IP4_REASS_RC_OK != rc)
1046                     {
1047                       return rc;
1048                     }
1049                   consumed = 1;
1050                 }
1051               else
1052                 {
1053                   discard_candidate = 1;
1054                 }
1055             }
1056           else if (fragment_last > candidate_vnb->ip.reass.range_last)
1057             {
1058               u32 overlap =
1059                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1060               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1061                 {
1062                   fvnb->ip.reass.range_first += overlap;
1063                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1064                     {
1065                       prev_range_bi = candidate_range_bi;
1066                       candidate_range_bi =
1067                         candidate_vnb->ip.reass.next_range_bi;
1068                       continue;
1069                     }
1070                   else
1071                     {
1072                       // special case - last range discarded
1073                       rc = ip4_full_reass_insert_range_in_chain (
1074                         vm, reass, candidate_range_bi, *bi0);
1075                       if (IP4_REASS_RC_OK != rc)
1076                         {
1077                           return rc;
1078                         }
1079                       consumed = 1;
1080                     }
1081                 }
1082               else
1083                 {
1084                   discard_candidate = 1;
1085                 }
1086             }
1087           else
1088             {
1089               discard_candidate = 1;
1090             }
1091           if (discard_candidate)
1092             {
1093               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1094               // discard candidate range, probe next range
1095               rc = ip4_full_reass_remove_range_from_chain (
1096                 vm, node, reass, prev_range_bi, candidate_range_bi);
1097               if (IP4_REASS_RC_OK != rc)
1098                 {
1099                   return rc;
1100                 }
1101               if (~0 != next_range_bi)
1102                 {
1103                   candidate_range_bi = next_range_bi;
1104                   continue;
1105                 }
1106               else
1107                 {
1108                   // special case - last range discarded
1109                   rc = ip4_full_reass_insert_range_in_chain (
1110                     vm, reass, prev_range_bi, *bi0);
1111                   if (IP4_REASS_RC_OK != rc)
1112                     {
1113                       return rc;
1114                     }
1115                   consumed = 1;
1116                 }
1117             }
1118         }
1119       break;
1120     }
1121   ++reass->fragments_n;
1122   if (consumed)
1123     {
1124       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1125         {
1126           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1127         }
1128     }
1129   if (~0 != reass->last_packet_octet &&
1130       reass->data_len == reass->last_packet_octet + 1)
1131     {
1132       *handoff_thread_idx = reass->sendout_thread_index;
1133       int handoff =
1134         reass->memory_owner_thread_index != reass->sendout_thread_index;
1135       rc =
1136         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1137                                  is_custom);
1138       if (IP4_REASS_RC_OK == rc && handoff)
1139         {
1140           rc = IP4_REASS_RC_HANDOFF;
1141         }
1142     }
1143   else
1144     {
1145       if (consumed)
1146         {
1147           *bi0 = ~0;
1148           if (reass->fragments_n > rm->max_reass_len)
1149             {
1150               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1151             }
1152         }
1153       else
1154         {
1155           *next0 = IP4_FULL_REASS_NEXT_DROP;
1156           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1157         }
1158     }
1159   return rc;
1160 }
1161
1162 always_inline uword
1163 ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1164                        vlib_frame_t *frame, ip4_full_reass_node_type_t type,
1165                        bool is_local)
1166 {
1167   u32 *from = vlib_frame_vector_args (frame);
1168   u32 n_left_from, n_left_to_next, *to_next, next_index;
1169   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1170   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1171   clib_spinlock_lock (&rt->lock);
1172
1173   n_left_from = frame->n_vectors;
1174   next_index = node->cached_next_index;
1175   while (n_left_from > 0)
1176     {
1177       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1178
1179       while (n_left_from > 0 && n_left_to_next > 0)
1180         {
1181           u32 bi0;
1182           vlib_buffer_t *b0;
1183           u32 next0;
1184           u32 error0 = IP4_ERROR_NONE;
1185
1186           bi0 = from[0];
1187           b0 = vlib_get_buffer (vm, bi0);
1188
1189           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1190           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1191             {
1192               // this is a whole packet - no fragmentation
1193               if (CUSTOM != type)
1194                 {
1195                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1196                 }
1197               else
1198                 {
1199                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1200                 }
1201               ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
1202                                         ~0);
1203               goto packet_enqueue;
1204             }
1205
1206           if (is_local && !rm->is_local_reass_enabled)
1207             {
1208               next0 = IP4_FULL_REASS_NEXT_DROP;
1209               goto packet_enqueue;
1210             }
1211
1212           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1213           const u32 fragment_length =
1214             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1215           const u32 fragment_last = fragment_first + fragment_length - 1;
1216
1217           if (fragment_first > fragment_last ||
1218               fragment_first + fragment_length > UINT16_MAX - 20 ||
1219               (fragment_length < 8 && // 8 is minimum frag length per RFC 791
1220                ip4_get_fragment_more (ip0)))
1221             {
1222               next0 = IP4_FULL_REASS_NEXT_DROP;
1223               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1224               goto packet_enqueue;
1225             }
1226           ip4_full_reass_kv_t kv;
1227           u8 do_handoff = 0;
1228
1229           kv.k.as_u64[0] =
1230             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1231                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1232             (u64) ip0->src_address.as_u32 << 32;
1233           kv.k.as_u64[1] =
1234             (u64) ip0->dst_address.
1235             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1236
1237           ip4_full_reass_t *reass = ip4_full_reass_find_or_create (
1238             vm, node, rm, rt, &kv, &do_handoff, &n_left_to_next, &to_next);
1239
1240           if (reass)
1241             {
1242               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1243               if (0 == fragment_first)
1244                 {
1245                   reass->sendout_thread_index = vm->thread_index;
1246                 }
1247             }
1248
1249           if (PREDICT_FALSE (do_handoff))
1250             {
1251               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1252               vnet_buffer (b0)->ip.reass.owner_thread_index =
1253                 kv.v.memory_owner_thread_index;
1254             }
1255           else if (reass)
1256             {
1257               u32 handoff_thread_idx;
1258               u32 counter = ~0;
1259               switch (ip4_full_reass_update
1260                       (vm, node, rm, rt, reass, &bi0, &next0,
1261                        &error0, CUSTOM == type, &handoff_thread_idx))
1262                 {
1263                 case IP4_REASS_RC_OK:
1264                   /* nothing to do here */
1265                   break;
1266                 case IP4_REASS_RC_HANDOFF:
1267                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1268                   b0 = vlib_get_buffer (vm, bi0);
1269                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1270                     handoff_thread_idx;
1271                   break;
1272                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1273                   counter = IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1274                   break;
1275                 case IP4_REASS_RC_NO_BUF:
1276                   counter = IP4_ERROR_REASS_NO_BUF;
1277                   break;
1278                 case IP4_REASS_RC_INTERNAL_ERROR:
1279                   counter = IP4_ERROR_REASS_INTERNAL_ERROR;
1280                   /* Sanitization is needed in internal error cases only, as
1281                    * the incoming packet is already dropped in other cases,
1282                    * also adding bi0 back to the reassembly list, fixes the
1283                    * leaking of buffers during internal errors.
1284                    *
1285                    * Also it doesnt make sense to send these buffers custom
1286                    * app, these fragments are with internal errors */
1287                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1288                   reass->error_next_index = ~0;
1289                   break;
1290                 }
1291
1292               if (~0 != counter)
1293                 {
1294                   vlib_node_increment_counter (vm, node->node_index, counter,
1295                                                1);
1296                   ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1297                                            &to_next);
1298                   ip4_full_reass_free (rm, rt, reass);
1299                   goto next_packet;
1300                 }
1301             }
1302           else
1303             {
1304               next0 = IP4_FULL_REASS_NEXT_DROP;
1305               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1306             }
1307
1308
1309         packet_enqueue:
1310
1311           if (bi0 != ~0)
1312             {
1313               to_next[0] = bi0;
1314               to_next += 1;
1315               n_left_to_next -= 1;
1316
1317               /* bi0 might have been updated by reass_finalize, reload */
1318               b0 = vlib_get_buffer (vm, bi0);
1319               if (IP4_ERROR_NONE != error0)
1320                 {
1321                   b0->error = node->errors[error0];
1322                 }
1323
1324               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1325                 {
1326                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1327                     {
1328                       ip4_full_reass_add_trace (
1329                         vm, node, NULL, bi0, HANDOFF, 0,
1330                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1331                     }
1332                 }
1333               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1334                 {
1335                   vnet_feature_next (&next0, b0);
1336                 }
1337
1338               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1339                                                to_next, n_left_to_next,
1340                                                bi0, next0);
1341               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1342             }
1343
1344         next_packet:
1345           from += 1;
1346           n_left_from -= 1;
1347         }
1348
1349       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1350     }
1351
1352   clib_spinlock_unlock (&rt->lock);
1353   return frame->n_vectors;
1354 }
1355
1356 static char *ip4_full_reass_error_strings[] = {
1357 #define _(sym, string) string,
1358   foreach_ip4_error
1359 #undef _
1360 };
1361
1362 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1363                                     vlib_node_runtime_t * node,
1364                                     vlib_frame_t * frame)
1365 {
1366   return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
1367 }
1368
1369 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1370     .name = "ip4-full-reassembly",
1371     .vector_size = sizeof (u32),
1372     .format_trace = format_ip4_full_reass_trace,
1373     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1374     .error_strings = ip4_full_reass_error_strings,
1375     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1376     .next_nodes =
1377         {
1378                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1379                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1380                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1381
1382         },
1383 };
1384
1385 VLIB_NODE_FN (ip4_local_full_reass_node)
1386 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1387 {
1388   return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
1389 }
1390
1391 VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
1392     .name = "ip4-local-full-reassembly",
1393     .vector_size = sizeof (u32),
1394     .format_trace = format_ip4_full_reass_trace,
1395     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1396     .error_strings = ip4_full_reass_error_strings,
1397     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1398     .next_nodes =
1399         {
1400                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1401                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1402                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
1403
1404         },
1405 };
1406
1407 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1408                                             vlib_node_runtime_t * node,
1409                                             vlib_frame_t * frame)
1410 {
1411   return ip4_full_reass_inline (vm, node, frame, FEATURE,
1412                                 false /* is_local */);
1413 }
1414
1415 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1416     .name = "ip4-full-reassembly-feature",
1417     .vector_size = sizeof (u32),
1418     .format_trace = format_ip4_full_reass_trace,
1419     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1420     .error_strings = ip4_full_reass_error_strings,
1421     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1422     .next_nodes =
1423         {
1424                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1425                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1426                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1427         },
1428 };
1429
1430 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1431     .arc_name = "ip4-unicast",
1432     .node_name = "ip4-full-reassembly-feature",
1433     .runs_before = VNET_FEATURES ("ip4-lookup",
1434                                   "ipsec4-input-feature"),
1435     .runs_after = 0,
1436 };
1437
1438 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1439                                            vlib_node_runtime_t * node,
1440                                            vlib_frame_t * frame)
1441 {
1442   return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
1443 }
1444
1445 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1446     .name = "ip4-full-reassembly-custom",
1447     .vector_size = sizeof (u32),
1448     .format_trace = format_ip4_full_reass_trace,
1449     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1450     .error_strings = ip4_full_reass_error_strings,
1451     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1452     .next_nodes =
1453         {
1454                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1455                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1456                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1457         },
1458 };
1459
1460 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1461     .arc_name = "ip4-unicast",
1462     .node_name = "ip4-full-reassembly-feature",
1463     .runs_before = VNET_FEATURES ("ip4-lookup",
1464                                   "ipsec4-input-feature"),
1465     .runs_after = 0,
1466 };
1467
1468
1469 #ifndef CLIB_MARCH_VARIANT
1470 uword
1471 ip4_full_reass_custom_register_next_node (uword node_index)
1472 {
1473   return vlib_node_add_next (vlib_get_main (),
1474                              ip4_full_reass_node_custom.index, node_index);
1475 }
1476
1477 always_inline u32
1478 ip4_full_reass_get_nbuckets ()
1479 {
1480   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1481   u32 nbuckets;
1482   u8 i;
1483
1484   /* need more mem with more workers */
1485   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1486                     IP4_REASS_HT_LOAD_FACTOR);
1487
1488   for (i = 0; i < 31; i++)
1489     if ((1 << i) >= nbuckets)
1490       break;
1491   nbuckets = 1 << i;
1492
1493   return nbuckets;
1494 }
1495 #endif /* CLIB_MARCH_VARIANT */
1496
1497 typedef enum
1498 {
1499   IP4_EVENT_CONFIG_CHANGED = 1,
1500 } ip4_full_reass_event_t;
1501
1502 typedef struct
1503 {
1504   int failure;
1505   clib_bihash_16_8_t *new_hash;
1506 } ip4_rehash_cb_ctx;
1507
1508 #ifndef CLIB_MARCH_VARIANT
1509 static int
1510 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1511 {
1512   ip4_rehash_cb_ctx *ctx = _ctx;
1513   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1514     {
1515       ctx->failure = 1;
1516     }
1517   return (BIHASH_WALK_CONTINUE);
1518 }
1519
1520 static void
1521 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1522                            u32 max_reassembly_length,
1523                            u32 expire_walk_interval_ms)
1524 {
1525   ip4_full_reass_main.timeout_ms = timeout_ms;
1526   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1527   ip4_full_reass_main.max_reass_n = max_reassemblies;
1528   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1529   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1530 }
1531
1532 vnet_api_error_t
1533 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1534                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1535 {
1536   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1537   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1538                              max_reassembly_length, expire_walk_interval_ms);
1539   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1540                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1541                              IP4_EVENT_CONFIG_CHANGED, 0);
1542   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1543   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1544     {
1545       clib_bihash_16_8_t new_hash;
1546       clib_memset (&new_hash, 0, sizeof (new_hash));
1547       ip4_rehash_cb_ctx ctx;
1548       ctx.failure = 0;
1549       ctx.new_hash = &new_hash;
1550       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1551                              new_nbuckets * 1024);
1552       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1553                                                ip4_rehash_cb, &ctx);
1554       if (ctx.failure)
1555         {
1556           clib_bihash_free_16_8 (&new_hash);
1557           return -1;
1558         }
1559       else
1560         {
1561           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1562           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1563                             sizeof (ip4_full_reass_main.hash));
1564           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1565         }
1566     }
1567   return 0;
1568 }
1569
1570 vnet_api_error_t
1571 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1572                     u32 * max_reassembly_length,
1573                     u32 * expire_walk_interval_ms)
1574 {
1575   *timeout_ms = ip4_full_reass_main.timeout_ms;
1576   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1577   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1578   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1579   return 0;
1580 }
1581
1582 static clib_error_t *
1583 ip4_full_reass_init_function (vlib_main_t * vm)
1584 {
1585   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1586   clib_error_t *error = 0;
1587   u32 nbuckets;
1588   vlib_node_t *node;
1589
1590   rm->vlib_main = vm;
1591
1592   vec_validate (rm->per_thread_data, vlib_num_workers ());
1593   ip4_full_reass_per_thread_t *rt;
1594   vec_foreach (rt, rm->per_thread_data)
1595   {
1596     clib_spinlock_init (&rt->lock);
1597     pool_alloc (rt->pool, rm->max_reass_n);
1598   }
1599
1600   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1601   ASSERT (node);
1602   rm->ip4_full_reass_expire_node_idx = node->index;
1603
1604   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1605                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1606                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1607                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1608
1609   nbuckets = ip4_full_reass_get_nbuckets ();
1610   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1611
1612   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1613   rm->fq_local_index =
1614     vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
1615   rm->fq_feature_index =
1616     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1617   rm->fq_custom_index =
1618     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1619
1620   rm->feature_use_refcount_per_intf = NULL;
1621   rm->is_local_reass_enabled = 1;
1622
1623   return error;
1624 }
1625
1626 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1627 #endif /* CLIB_MARCH_VARIANT */
1628
1629 static uword
1630 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1631                              CLIB_UNUSED (vlib_frame_t *f))
1632 {
1633   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1634   uword event_type, *event_data = 0;
1635
1636   while (true)
1637     {
1638       vlib_process_wait_for_event_or_clock (vm,
1639                                             (f64)
1640                                             rm->expire_walk_interval_ms /
1641                                             (f64) MSEC_PER_SEC);
1642       event_type = vlib_process_get_events (vm, &event_data);
1643
1644       switch (event_type)
1645         {
1646         case ~0:
1647           /* no events => timeout */
1648           /* fallthrough */
1649         case IP4_EVENT_CONFIG_CHANGED:
1650           /* nothing to do here */
1651           break;
1652         default:
1653           clib_warning ("BUG: event type 0x%wx", event_type);
1654           break;
1655         }
1656       f64 now = vlib_time_now (vm);
1657
1658       ip4_full_reass_t *reass;
1659       int *pool_indexes_to_free = NULL;
1660
1661       uword thread_index = 0;
1662       int index;
1663       const uword nthreads = vlib_num_workers () + 1;
1664       u32 n_left_to_next, *to_next;
1665
1666       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1667         {
1668           ip4_full_reass_per_thread_t *rt =
1669             &rm->per_thread_data[thread_index];
1670           clib_spinlock_lock (&rt->lock);
1671
1672           vec_reset_length (pool_indexes_to_free);
1673
1674           pool_foreach_index (index, rt->pool)
1675             {
1676               reass = pool_elt_at_index (rt->pool, index);
1677               if (now > reass->last_heard + rm->timeout)
1678                 {
1679                   vec_add1 (pool_indexes_to_free, index);
1680                 }
1681             }
1682
1683           int *i;
1684           vec_foreach (i, pool_indexes_to_free)
1685           {
1686             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1687             ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1688                                      &to_next);
1689             ip4_full_reass_free (rm, rt, reass);
1690           }
1691
1692           clib_spinlock_unlock (&rt->lock);
1693         }
1694
1695       vec_free (pool_indexes_to_free);
1696       if (event_data)
1697         {
1698           vec_set_len (event_data, 0);
1699         }
1700     }
1701
1702   return 0;
1703 }
1704
1705 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1706     .function = ip4_full_reass_walk_expired,
1707     .type = VLIB_NODE_TYPE_PROCESS,
1708     .name = "ip4-full-reassembly-expire-walk",
1709     .format_trace = format_ip4_full_reass_trace,
1710     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1711     .error_strings = ip4_full_reass_error_strings,
1712
1713 };
1714
1715 static u8 *
1716 format_ip4_full_reass_key (u8 * s, va_list * args)
1717 {
1718   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1719   s =
1720     format (s,
1721             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1722             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1723             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1724   return s;
1725 }
1726
1727 static u8 *
1728 format_ip4_reass (u8 * s, va_list * args)
1729 {
1730   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1731   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1732
1733   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1734               "last_packet_octet: %u, trace_op_counter: %u\n",
1735               reass->id, format_ip4_full_reass_key, &reass->key,
1736               reass->first_bi, reass->data_len,
1737               reass->last_packet_octet, reass->trace_op_counter);
1738
1739   u32 bi = reass->first_bi;
1740   u32 counter = 0;
1741   while (~0 != bi)
1742     {
1743       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1744       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1745       s =
1746         format (s,
1747                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1748                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1749                 vnb->ip.reass.range_last, bi,
1750                 ip4_full_reass_buffer_get_data_offset (b),
1751                 ip4_full_reass_buffer_get_data_len (b),
1752                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1753       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1754         {
1755           bi = b->next_buffer;
1756         }
1757       else
1758         {
1759           bi = ~0;
1760         }
1761     }
1762   return s;
1763 }
1764
1765 static clib_error_t *
1766 show_ip4_reass (vlib_main_t * vm,
1767                 unformat_input_t * input,
1768                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1769 {
1770   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1771
1772   vlib_cli_output (vm, "---------------------");
1773   vlib_cli_output (vm, "IP4 reassembly status");
1774   vlib_cli_output (vm, "---------------------");
1775   bool details = false;
1776   if (unformat (input, "details"))
1777     {
1778       details = true;
1779     }
1780
1781   u32 sum_reass_n = 0;
1782   ip4_full_reass_t *reass;
1783   uword thread_index;
1784   const uword nthreads = vlib_num_workers () + 1;
1785   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1786     {
1787       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1788       clib_spinlock_lock (&rt->lock);
1789       if (details)
1790         {
1791           pool_foreach (reass, rt->pool) {
1792             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1793           }
1794         }
1795       sum_reass_n += rt->reass_n;
1796       clib_spinlock_unlock (&rt->lock);
1797     }
1798   vlib_cli_output (vm, "---------------------");
1799   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1800                    (long unsigned) sum_reass_n);
1801   vlib_cli_output (vm,
1802                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1803                    (long unsigned) rm->max_reass_n);
1804   vlib_cli_output (vm,
1805                    "Maximum configured amount of fragments "
1806                    "per full IP4 reassembly: %lu\n",
1807                    (long unsigned) rm->max_reass_len);
1808   vlib_cli_output (vm,
1809                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1810                    (long unsigned) rm->timeout_ms);
1811   vlib_cli_output (vm,
1812                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1813                    (long unsigned) rm->expire_walk_interval_ms);
1814   return 0;
1815 }
1816
1817 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1818     .path = "show ip4-full-reassembly",
1819     .short_help = "show ip4-full-reassembly [details]",
1820     .function = show_ip4_reass,
1821 };
1822
1823 #ifndef CLIB_MARCH_VARIANT
1824 vnet_api_error_t
1825 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1826 {
1827   return vnet_feature_enable_disable ("ip4-unicast",
1828                                       "ip4-full-reassembly-feature",
1829                                       sw_if_index, enable_disable, 0, 0);
1830 }
1831 #endif /* CLIB_MARCH_VARIANT */
1832
1833
1834 #define foreach_ip4_full_reass_handoff_error                       \
1835 _(CONGESTION_DROP, "congestion drop")
1836
1837
1838 typedef enum
1839 {
1840 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1841   foreach_ip4_full_reass_handoff_error
1842 #undef _
1843     IP4_FULL_REASS_HANDOFF_N_ERROR,
1844 } ip4_full_reass_handoff_error_t;
1845
1846 static char *ip4_full_reass_handoff_error_strings[] = {
1847 #define _(sym,string) string,
1848   foreach_ip4_full_reass_handoff_error
1849 #undef _
1850 };
1851
1852 typedef struct
1853 {
1854   u32 next_worker_index;
1855 } ip4_full_reass_handoff_trace_t;
1856
1857 static u8 *
1858 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1859 {
1860   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1861   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1862   ip4_full_reass_handoff_trace_t *t =
1863     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1864
1865   s =
1866     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1867             t->next_worker_index);
1868
1869   return s;
1870 }
1871
1872 always_inline uword
1873 ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1874                                     vlib_frame_t *frame,
1875                                     ip4_full_reass_node_type_t type,
1876                                     bool is_local)
1877 {
1878   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1879
1880   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1881   u32 n_enq, n_left_from, *from;
1882   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1883   u32 fq_index;
1884
1885   from = vlib_frame_vector_args (frame);
1886   n_left_from = frame->n_vectors;
1887   vlib_get_buffers (vm, from, bufs, n_left_from);
1888
1889   b = bufs;
1890   ti = thread_indices;
1891
1892   switch (type)
1893     {
1894     case NORMAL:
1895       if (is_local)
1896         {
1897           fq_index = rm->fq_local_index;
1898         }
1899       else
1900         {
1901           fq_index = rm->fq_index;
1902         }
1903       break;
1904     case FEATURE:
1905       fq_index = rm->fq_feature_index;
1906       break;
1907     case CUSTOM:
1908       fq_index = rm->fq_custom_index;
1909       break;
1910     default:
1911       clib_warning ("Unexpected `type' (%d)!", type);
1912     }
1913
1914   while (n_left_from > 0)
1915     {
1916       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1917
1918       if (PREDICT_FALSE
1919           ((node->flags & VLIB_NODE_FLAG_TRACE)
1920            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1921         {
1922           ip4_full_reass_handoff_trace_t *t =
1923             vlib_add_trace (vm, node, b[0], sizeof (*t));
1924           t->next_worker_index = ti[0];
1925         }
1926
1927       n_left_from -= 1;
1928       ti += 1;
1929       b += 1;
1930     }
1931   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1932                                          thread_indices, frame->n_vectors, 1);
1933
1934   if (n_enq < frame->n_vectors)
1935     vlib_node_increment_counter (vm, node->node_index,
1936                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1937                                  frame->n_vectors - n_enq);
1938   return frame->n_vectors;
1939 }
1940
1941 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1942                                             vlib_node_runtime_t * node,
1943                                             vlib_frame_t * frame)
1944 {
1945   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1946                                              false /* is_local */);
1947 }
1948
1949
1950 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1951   .name = "ip4-full-reassembly-handoff",
1952   .vector_size = sizeof (u32),
1953   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1954   .error_strings = ip4_full_reass_handoff_error_strings,
1955   .format_trace = format_ip4_full_reass_handoff_trace,
1956
1957   .n_next_nodes = 1,
1958
1959   .next_nodes = {
1960     [0] = "error-drop",
1961   },
1962 };
1963
1964 VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
1965 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1966 {
1967   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1968                                              true /* is_local */);
1969 }
1970
1971 VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
1972   .name = "ip4-local-full-reassembly-handoff",
1973   .vector_size = sizeof (u32),
1974   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1975   .error_strings = ip4_full_reass_handoff_error_strings,
1976   .format_trace = format_ip4_full_reass_handoff_trace,
1977
1978   .n_next_nodes = 1,
1979
1980   .next_nodes = {
1981     [0] = "error-drop",
1982   },
1983 };
1984
1985 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1986                                                     vlib_node_runtime_t *
1987                                                     node,
1988                                                     vlib_frame_t * frame)
1989 {
1990   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
1991                                              false /* is_local */);
1992 }
1993
1994 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1995   .name = "ip4-full-reass-feature-hoff",
1996   .vector_size = sizeof (u32),
1997   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1998   .error_strings = ip4_full_reass_handoff_error_strings,
1999   .format_trace = format_ip4_full_reass_handoff_trace,
2000
2001   .n_next_nodes = 1,
2002
2003   .next_nodes = {
2004     [0] = "error-drop",
2005   },
2006 };
2007
2008 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
2009                                                     vlib_node_runtime_t *
2010                                                     node,
2011                                                     vlib_frame_t * frame)
2012 {
2013   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
2014                                              false /* is_local */);
2015 }
2016
2017 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
2018   .name = "ip4-full-reass-custom-hoff",
2019   .vector_size = sizeof (u32),
2020   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2021   .error_strings = ip4_full_reass_handoff_error_strings,
2022   .format_trace = format_ip4_full_reass_handoff_trace,
2023
2024   .n_next_nodes = 1,
2025
2026   .next_nodes = {
2027     [0] = "error-drop",
2028   },
2029 };
2030
2031 #ifndef CLIB_MARCH_VARIANT
2032 int
2033 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2034 {
2035   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
2036   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2037   if (is_enable)
2038     {
2039       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2040         {
2041           ++rm->feature_use_refcount_per_intf[sw_if_index];
2042           return vnet_feature_enable_disable ("ip4-unicast",
2043                                               "ip4-full-reassembly-feature",
2044                                               sw_if_index, 1, 0, 0);
2045         }
2046       ++rm->feature_use_refcount_per_intf[sw_if_index];
2047     }
2048   else
2049     {
2050       --rm->feature_use_refcount_per_intf[sw_if_index];
2051       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2052         return vnet_feature_enable_disable ("ip4-unicast",
2053                                             "ip4-full-reassembly-feature",
2054                                             sw_if_index, 0, 0, 0);
2055     }
2056   return -1;
2057 }
2058
2059 void
2060 ip4_local_full_reass_enable_disable (int enable)
2061 {
2062   if (enable)
2063     {
2064       ip4_full_reass_main.is_local_reass_enabled = 1;
2065     }
2066   else
2067     {
2068       ip4_full_reass_main.is_local_reass_enabled = 0;
2069     }
2070 }
2071
2072 int
2073 ip4_local_full_reass_enabled ()
2074 {
2075   return ip4_full_reass_main.is_local_reass_enabled;
2076 }
2077
2078 #endif
2079
2080 /*
2081  * fd.io coding-style-patch-verification: ON
2082  *
2083  * Local Variables:
2084  * eval: (c-set-style "gnu")
2085  * End:
2086  */