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       /* record number of packets sent to custom app */
 457       vlib_node_increment_counter (vm, node->node_index,
 458                                    IP4_ERROR_REASS_TO_CUSTOM_APP,
 459                                    vec_len (to_free));
 460
 461       while (vec_len (to_free) > 0)
 462         {
 463           vlib_get_next_frame (vm, node, next_index, *to_next,
 464                                (*n_left_to_next));
 465
 466           while (vec_len (to_free) > 0 && (*n_left_to_next) > 0)
 467             {
 468               bi = vec_pop (to_free);
 469
 470               if (~0 != bi)
 471                 {
 472                   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 473                   if ((b->flags & VLIB_BUFFER_IS_TRACED))
 474                     {
 475                       ip4_full_reass_add_trace (vm, node, reass, bi,
 476                                                 RANGE_DISCARD, 0, ~0);
 477                     }
 478                   *to_next[0] = bi;
 479                   (*to_next) += 1;
 480                   (*n_left_to_next) -= 1;
 481                 }
 482             }
 483           vlib_put_next_frame (vm, node, next_index, (*n_left_to_next));
 484         }
 485     }
 486   else
 487     {
 488       vlib_buffer_free (vm, to_free, vec_len (to_free));
 489     }
 490   vec_free (to_free);
 491 }
 492
 493 always_inline void
 494 sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip4_full_reass_t *reass,
 495                                     u32 *bi0)
 496 {
 497   u32 range_bi = reass->first_bi;
 498   vlib_buffer_t *range_b;
 499   vnet_buffer_opaque_t *range_vnb;
 500
 501   while (~0 != range_bi)
 502     {
 503       range_b = vlib_get_buffer (vm, range_bi);
 504       range_vnb = vnet_buffer (range_b);
 505       u32 bi = range_bi;
 506       if (~0 != bi)
 507         {
 508           if (bi == *bi0)
 509             *bi0 = ~0;
 510           if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 511             {
 512               u32 _bi = bi;
 513               vlib_buffer_t *_b = vlib_get_buffer (vm, _bi);
 514               while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 515                 {
 516                   if (_b->next_buffer != range_vnb->ip.reass.next_range_bi)
 517                     {
 518                       _bi = _b->next_buffer;
 519                       _b = vlib_get_buffer (vm, _bi);
 520                     }
 521                   else
 522                     {
 523                       _b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 524                       break;
 525                     }
 526                 }
 527             }
 528           range_bi = range_vnb->ip.reass.next_range_bi;
 529         }
 530     }
 531   if (*bi0 != ~0)
 532     {
 533       vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 534       vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 535       if (~0 != reass->first_bi)
 536         {
 537           fvnb->ip.reass.next_range_bi = reass->first_bi;
 538           reass->first_bi = *bi0;
 539         }
 540       else
 541         {
 542           reass->first_bi = *bi0;
 543           fvnb->ip.reass.next_range_bi = ~0;
 544         }
 545       *bi0 = ~0;
 546     }
 547 }
 548
 549 always_inline void
 550 ip4_full_reass_init (ip4_full_reass_t * reass)
 551 {
 552   reass->first_bi = ~0;
 553   reass->last_packet_octet = ~0;
 554   reass->data_len = 0;
 555   reass->next_index = ~0;
 556   reass->error_next_index = ~0;
 557 }
 558
 559 always_inline ip4_full_reass_t *
 560 ip4_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
 561                                ip4_full_reass_main_t *rm,
 562                                ip4_full_reass_per_thread_t *rt,
 563                                ip4_full_reass_kv_t *kv, u8 *do_handoff,
 564                                u32 *n_left_to_next, u32 **to_next)
 565 {
 566   ip4_full_reass_t *reass;
 567   f64 now;
 568
 569 again:
 570
 571   reass = NULL;
 572   now = vlib_time_now (vm);
 573   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 574     {
 575       if (vm->thread_index != kv->v.memory_owner_thread_index)
 576         {
 577           *do_handoff = 1;
 578           return NULL;
 579         }
 580       reass =
 581         pool_elt_at_index (rm->per_thread_data
 582                            [kv->v.memory_owner_thread_index].pool,
 583                            kv->v.reass_index);
 584
 585       if (now > reass->last_heard + rm->timeout)
 586         {
 587           vlib_node_increment_counter (vm, node->node_index,
 588                                        IP4_ERROR_REASS_TIMEOUT, 1);
 589           ip4_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next);
 590           ip4_full_reass_free (rm, rt, reass);
 591           reass = NULL;
 592         }
 593     }
 594
 595   if (reass)
 596     {
 597       reass->last_heard = now;
 598       return reass;
 599     }
 600
 601   if (rt->reass_n >= rm->max_reass_n)
 602     {
 603       reass = NULL;
 604       return reass;
 605     }
 606   else
 607     {
 608       pool_get (rt->pool, reass);
 609       clib_memset (reass, 0, sizeof (*reass));
 610       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 611       reass->memory_owner_thread_index = vm->thread_index;
 612       ++rt->id_counter;
 613       ip4_full_reass_init (reass);
 614       ++rt->reass_n;
 615     }
 616
 617   reass->key.as_u64[0] = kv->kv.key[0];
 618   reass->key.as_u64[1] = kv->kv.key[1];
 619   kv->v.reass_index = (reass - rt->pool);
 620   kv->v.memory_owner_thread_index = vm->thread_index;
 621   reass->last_heard = now;
 622
 623   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 624   if (rv)
 625     {
 626       ip4_full_reass_free_ctx (rt, reass);
 627       reass = NULL;
 628       // if other worker created a context already work with the other copy
 629       if (-2 == rv)
 630         goto again;
 631     }
 632
 633   return reass;
 634 }
 635
 636 always_inline ip4_full_reass_rc_t
 637 ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
 638                          ip4_full_reass_main_t * rm,
 639                          ip4_full_reass_per_thread_t * rt,
 640                          ip4_full_reass_t * reass, u32 * bi0,
 641                          u32 * next0, u32 * error0, bool is_custom)
 642 {
 643   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 644   vlib_buffer_t *last_b = NULL;
 645   u32 sub_chain_bi = reass->first_bi;
 646   u32 total_length = 0;
 647   u32 buf_cnt = 0;
 648   do
 649     {
 650       u32 tmp_bi = sub_chain_bi;
 651       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 652       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 653       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 654       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 655           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 656         {
 657           return IP4_REASS_RC_INTERNAL_ERROR;
 658         }
 659
 660       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 661       u32 trim_front =
 662         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 663       u32 trim_end =
 664         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 665       if (tmp_bi == reass->first_bi)
 666         {
 667           /* first buffer - keep ip4 header */
 668           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 669             {
 670               return IP4_REASS_RC_INTERNAL_ERROR;
 671             }
 672           trim_front = 0;
 673           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 674             ip4_header_bytes (ip);
 675           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 676             {
 677               return IP4_REASS_RC_INTERNAL_ERROR;
 678             }
 679         }
 680       u32 keep_data =
 681         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 682       while (1)
 683         {
 684           ++buf_cnt;
 685           if (trim_front)
 686             {
 687               if (trim_front > tmp->current_length)
 688                 {
 689                   /* drop whole buffer */
 690                   u32 to_be_freed_bi = tmp_bi;
 691                   trim_front -= tmp->current_length;
 692                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 693                     {
 694                       return IP4_REASS_RC_INTERNAL_ERROR;
 695                     }
 696                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 697                   tmp_bi = tmp->next_buffer;
 698                   tmp->next_buffer = 0;
 699                   tmp = vlib_get_buffer (vm, tmp_bi);
 700                   vlib_buffer_free_one (vm, to_be_freed_bi);
 701                   continue;
 702                 }
 703               else
 704                 {
 705                   vlib_buffer_advance (tmp, trim_front);
 706                   trim_front = 0;
 707                 }
 708             }
 709           if (keep_data)
 710             {
 711               if (last_b)
 712                 {
 713                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 714                   last_b->next_buffer = tmp_bi;
 715                 }
 716               last_b = tmp;
 717               if (keep_data <= tmp->current_length)
 718                 {
 719                   tmp->current_length = keep_data;
 720                   keep_data = 0;
 721                 }
 722               else
 723                 {
 724                   keep_data -= tmp->current_length;
 725                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 726                     {
 727                       return IP4_REASS_RC_INTERNAL_ERROR;
 728                     }
 729                 }
 730               total_length += tmp->current_length;
 731               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 732                 {
 733                   tmp_bi = tmp->next_buffer;
 734                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 735                 }
 736               else
 737                 {
 738                   break;
 739                 }
 740             }
 741           else
 742             {
 743               u32 to_be_freed_bi = tmp_bi;
 744               if (reass->first_bi == tmp_bi)
 745                 {
 746                   return IP4_REASS_RC_INTERNAL_ERROR;
 747                 }
 748               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 749                 {
 750                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 751                   tmp_bi = tmp->next_buffer;
 752                   tmp->next_buffer = 0;
 753                   tmp = vlib_get_buffer (vm, tmp_bi);
 754                   vlib_buffer_free_one (vm, to_be_freed_bi);
 755                 }
 756               else
 757                 {
 758                   tmp->next_buffer = 0;
 759                   vlib_buffer_free_one (vm, to_be_freed_bi);
 760                   break;
 761                 }
 762             }
 763         }
 764       sub_chain_bi =
 765         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 766         reass.next_range_bi;
 767     }
 768   while (~0 != sub_chain_bi);
 769
 770   if (!last_b)
 771     {
 772       return IP4_REASS_RC_INTERNAL_ERROR;
 773     }
 774   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 775
 776   if (total_length < first_b->current_length)
 777     {
 778       return IP4_REASS_RC_INTERNAL_ERROR;
 779     }
 780   total_length -= first_b->current_length;
 781   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 782   first_b->total_length_not_including_first_buffer = total_length;
 783   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 784   ip->flags_and_fragment_offset = 0;
 785   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 786   ip->checksum = ip4_header_checksum (ip);
 787   if (!vlib_buffer_chain_linearize (vm, first_b))
 788     {
 789       return IP4_REASS_RC_NO_BUF;
 790     }
 791   // reset to reconstruct the mbuf linking
 792   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 793   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 794     {
 795       ip4_full_reass_add_trace (vm, node, reass, reass->first_bi, FINALIZE, 0,
 796                                 ~0);
 797 #if 0
 798       // following code does a hexdump of packet fragments to stdout ...
 799       do
 800         {
 801           u32 bi = reass->first_bi;
 802           u8 *s = NULL;
 803           while (~0 != bi)
 804             {
 805               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 806               s = format (s, "%u: %U\n", bi, format_hexdump,
 807                           vlib_buffer_get_current (b), b->current_length);
 808               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 809                 {
 810                   bi = b->next_buffer;
 811                 }
 812               else
 813                 {
 814                   break;
 815                 }
 816             }
 817           printf ("%.*s\n", vec_len (s), s);
 818           fflush (stdout);
 819           vec_free (s);
 820         }
 821       while (0);
 822 #endif
 823     }
 824   *bi0 = reass->first_bi;
 825   if (!is_custom)
 826     {
 827       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 828     }
 829   else
 830     {
 831       *next0 = reass->next_index;
 832     }
 833   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 834
 835   /* Keep track of number of successfully reassembled packets and number of
 836    * fragments reassembled */
 837   vlib_node_increment_counter (vm, node->node_index, IP4_ERROR_REASS_SUCCESS,
 838                                1);
 839
 840   vlib_node_increment_counter (vm, node->node_index,
 841                                IP4_ERROR_REASS_FRAGMENTS_REASSEMBLED,
 842                                reass->fragments_n);
 843
 844   *error0 = IP4_ERROR_NONE;
 845   ip4_full_reass_free (rm, rt, reass);
 846   reass = NULL;
 847   return IP4_REASS_RC_OK;
 848 }
 849
 850 always_inline ip4_full_reass_rc_t
 851 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 852                                       ip4_full_reass_t * reass,
 853                                       u32 prev_range_bi, u32 new_next_bi)
 854 {
 855   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 856   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 857   if (~0 != prev_range_bi)
 858     {
 859       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 860       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 861       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 862       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 863     }
 864   else
 865     {
 866       if (~0 != reass->first_bi)
 867         {
 868           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 869         }
 870       reass->first_bi = new_next_bi;
 871     }
 872   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 873   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 874       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 875     {
 876       return IP4_REASS_RC_INTERNAL_ERROR;
 877     }
 878   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 879   return IP4_REASS_RC_OK;
 880 }
 881
 882 always_inline ip4_full_reass_rc_t
 883 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 884                                         vlib_node_runtime_t * node,
 885                                         ip4_full_reass_t * reass,
 886                                         u32 prev_range_bi, u32 discard_bi)
 887 {
 888   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 889   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 890   if (~0 != prev_range_bi)
 891     {
 892       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 893       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 894       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 895         {
 896           return IP4_REASS_RC_INTERNAL_ERROR;
 897         }
 898       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 899     }
 900   else
 901     {
 902       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 903     }
 904   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 905   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 906       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 907     {
 908       return IP4_REASS_RC_INTERNAL_ERROR;
 909     }
 910   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 911   while (1)
 912     {
 913       u32 to_be_freed_bi = discard_bi;
 914       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 915         {
 916           ip4_full_reass_add_trace (vm, node, reass, discard_bi, RANGE_DISCARD,
 917                                     0, ~0);
 918         }
 919       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 920         {
 921           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 922           discard_bi = discard_b->next_buffer;
 923           discard_b->next_buffer = 0;
 924           discard_b = vlib_get_buffer (vm, discard_bi);
 925           vlib_buffer_free_one (vm, to_be_freed_bi);
 926         }
 927       else
 928         {
 929           discard_b->next_buffer = 0;
 930           vlib_buffer_free_one (vm, to_be_freed_bi);
 931           break;
 932         }
 933     }
 934   return IP4_REASS_RC_OK;
 935 }
 936
 937 always_inline ip4_full_reass_rc_t
 938 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 939                        ip4_full_reass_main_t * rm,
 940                        ip4_full_reass_per_thread_t * rt,
 941                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 942                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 943 {
 944   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 945   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 946   if (is_custom)
 947     {
 948       // store (error_)next_index before it's overwritten
 949       reass->next_index = fvnb->ip.reass.next_index;
 950       reass->error_next_index = fvnb->ip.reass.error_next_index;
 951     }
 952   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 953   int consumed = 0;
 954   ip4_header_t *fip = vlib_buffer_get_current (fb);
 955   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 956   const u32 fragment_length =
 957     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 958   const u32 fragment_last = fragment_first + fragment_length - 1;
 959   fvnb->ip.reass.fragment_first = fragment_first;
 960   fvnb->ip.reass.fragment_last = fragment_last;
 961   int more_fragments = ip4_get_fragment_more (fip);
 962   u32 candidate_range_bi = reass->first_bi;
 963   u32 prev_range_bi = ~0;
 964   fvnb->ip.reass.range_first = fragment_first;
 965   fvnb->ip.reass.range_last = fragment_last;
 966   fvnb->ip.reass.next_range_bi = ~0;
 967   if (!more_fragments)
 968     {
 969       reass->last_packet_octet = fragment_last;
 970     }
 971   if (~0 == reass->first_bi)
 972     {
 973       // starting a new reassembly
 974       rc =
 975         ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
 976       if (IP4_REASS_RC_OK != rc)
 977         {
 978           return rc;
 979         }
 980       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 981         {
 982           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
 983         }
 984       *bi0 = ~0;
 985       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 986       reass->fragments_n = 1;
 987       return IP4_REASS_RC_OK;
 988     }
 989   reass->min_fragment_length =
 990     clib_min (clib_net_to_host_u16 (fip->length),
 991               fvnb->ip.reass.estimated_mtu);
 992   while (~0 != candidate_range_bi)
 993     {
 994       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 995       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 996       if (fragment_first > candidate_vnb->ip.reass.range_last)
 997         {
 998           // this fragments starts after candidate range
 999           prev_range_bi = candidate_range_bi;
1000           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
1001           if (candidate_vnb->ip.reass.range_last < fragment_last &&
1002               ~0 == candidate_range_bi)
1003             {
1004               // special case - this fragment falls beyond all known ranges
1005               rc = ip4_full_reass_insert_range_in_chain (vm, reass,
1006                                                          prev_range_bi, *bi0);
1007               if (IP4_REASS_RC_OK != rc)
1008                 {
1009                   return rc;
1010                 }
1011               consumed = 1;
1012               break;
1013             }
1014           continue;
1015         }
1016       if (fragment_last < candidate_vnb->ip.reass.range_first)
1017         {
1018           // this fragment ends before candidate range without any overlap
1019           rc = ip4_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
1020                                                      *bi0);
1021           if (IP4_REASS_RC_OK != rc)
1022             {
1023               return rc;
1024             }
1025           consumed = 1;
1026         }
1027       else
1028         {
1029           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
1030               fragment_last <= candidate_vnb->ip.reass.range_last)
1031             {
1032               // this fragment is a (sub)part of existing range, ignore it
1033               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1034                 {
1035                   ip4_full_reass_add_trace (vm, node, reass, *bi0,
1036                                             RANGE_OVERLAP, 0, ~0);
1037                 }
1038               break;
1039             }
1040           int discard_candidate = 0;
1041           if (fragment_first < candidate_vnb->ip.reass.range_first)
1042             {
1043               u32 overlap =
1044                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
1045               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1046                 {
1047                   candidate_vnb->ip.reass.range_first += overlap;
1048                   if (reass->data_len < overlap)
1049                     {
1050                       return IP4_REASS_RC_INTERNAL_ERROR;
1051                     }
1052                   reass->data_len -= overlap;
1053                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1054                     {
1055                       ip4_full_reass_add_trace (vm, node, reass,
1056                                                 candidate_range_bi,
1057                                                 RANGE_SHRINK, 0, ~0);
1058                     }
1059                   rc = ip4_full_reass_insert_range_in_chain (
1060                     vm, reass, prev_range_bi, *bi0);
1061                   if (IP4_REASS_RC_OK != rc)
1062                     {
1063                       return rc;
1064                     }
1065                   consumed = 1;
1066                 }
1067               else
1068                 {
1069                   discard_candidate = 1;
1070                 }
1071             }
1072           else if (fragment_last > candidate_vnb->ip.reass.range_last)
1073             {
1074               u32 overlap =
1075                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
1076               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
1077                 {
1078                   fvnb->ip.reass.range_first += overlap;
1079                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
1080                     {
1081                       prev_range_bi = candidate_range_bi;
1082                       candidate_range_bi =
1083                         candidate_vnb->ip.reass.next_range_bi;
1084                       continue;
1085                     }
1086                   else
1087                     {
1088                       // special case - last range discarded
1089                       rc = ip4_full_reass_insert_range_in_chain (
1090                         vm, reass, candidate_range_bi, *bi0);
1091                       if (IP4_REASS_RC_OK != rc)
1092                         {
1093                           return rc;
1094                         }
1095                       consumed = 1;
1096                     }
1097                 }
1098               else
1099                 {
1100                   discard_candidate = 1;
1101                 }
1102             }
1103           else
1104             {
1105               discard_candidate = 1;
1106             }
1107           if (discard_candidate)
1108             {
1109               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1110               // discard candidate range, probe next range
1111               rc = ip4_full_reass_remove_range_from_chain (
1112                 vm, node, reass, prev_range_bi, candidate_range_bi);
1113               if (IP4_REASS_RC_OK != rc)
1114                 {
1115                   return rc;
1116                 }
1117               if (~0 != next_range_bi)
1118                 {
1119                   candidate_range_bi = next_range_bi;
1120                   continue;
1121                 }
1122               else
1123                 {
1124                   // special case - last range discarded
1125                   rc = ip4_full_reass_insert_range_in_chain (
1126                     vm, reass, prev_range_bi, *bi0);
1127                   if (IP4_REASS_RC_OK != rc)
1128                     {
1129                       return rc;
1130                     }
1131                   consumed = 1;
1132                 }
1133             }
1134         }
1135       break;
1136     }
1137   ++reass->fragments_n;
1138   if (consumed)
1139     {
1140       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1141         {
1142           ip4_full_reass_add_trace (vm, node, reass, *bi0, RANGE_NEW, 0, ~0);
1143         }
1144     }
1145   if (~0 != reass->last_packet_octet &&
1146       reass->data_len == reass->last_packet_octet + 1)
1147     {
1148       *handoff_thread_idx = reass->sendout_thread_index;
1149       int handoff =
1150         reass->memory_owner_thread_index != reass->sendout_thread_index;
1151       rc =
1152         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1153                                  is_custom);
1154       if (IP4_REASS_RC_OK == rc && handoff)
1155         {
1156           rc = IP4_REASS_RC_HANDOFF;
1157         }
1158     }
1159   else
1160     {
1161       if (consumed)
1162         {
1163           *bi0 = ~0;
1164           if (reass->fragments_n > rm->max_reass_len)
1165             {
1166               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1167             }
1168         }
1169       else
1170         {
1171           *next0 = IP4_FULL_REASS_NEXT_DROP;
1172           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1173         }
1174     }
1175   return rc;
1176 }
1177
1178 always_inline uword
1179 ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1180                        vlib_frame_t *frame, ip4_full_reass_node_type_t type,
1181                        bool is_local)
1182 {
1183   u32 *from = vlib_frame_vector_args (frame);
1184   u32 n_left_from, n_left_to_next, *to_next, next_index;
1185   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1186   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1187   clib_spinlock_lock (&rt->lock);
1188
1189   n_left_from = frame->n_vectors;
1190   next_index = node->cached_next_index;
1191   while (n_left_from > 0)
1192     {
1193       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1194
1195       while (n_left_from > 0 && n_left_to_next > 0)
1196         {
1197           u32 bi0;
1198           vlib_buffer_t *b0;
1199           u32 next0;
1200           u32 error0 = IP4_ERROR_NONE;
1201
1202           bi0 = from[0];
1203           b0 = vlib_get_buffer (vm, bi0);
1204
1205           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1206           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1207             {
1208               // this is a whole packet - no fragmentation
1209               if (CUSTOM != type)
1210                 {
1211                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1212                 }
1213               else
1214                 {
1215                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1216                 }
1217               ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
1218                                         ~0);
1219               goto packet_enqueue;
1220             }
1221
1222           if (is_local && !rm->is_local_reass_enabled)
1223             {
1224               next0 = IP4_FULL_REASS_NEXT_DROP;
1225               goto packet_enqueue;
1226             }
1227
1228           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1229           const u32 fragment_length =
1230             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1231           const u32 fragment_last = fragment_first + fragment_length - 1;
1232
1233           /* Keep track of received fragments */
1234           vlib_node_increment_counter (vm, node->node_index,
1235                                        IP4_ERROR_REASS_FRAGMENTS_RCVD, 1);
1236
1237           if (fragment_first > fragment_last ||
1238               fragment_first + fragment_length > UINT16_MAX - 20 ||
1239               (fragment_length < 8 && // 8 is minimum frag length per RFC 791
1240                ip4_get_fragment_more (ip0)))
1241             {
1242               next0 = IP4_FULL_REASS_NEXT_DROP;
1243               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1244               goto packet_enqueue;
1245             }
1246           ip4_full_reass_kv_t kv;
1247           u8 do_handoff = 0;
1248
1249           kv.k.as_u64[0] =
1250             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1251                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1252             (u64) ip0->src_address.as_u32 << 32;
1253           kv.k.as_u64[1] =
1254             (u64) ip0->dst_address.
1255             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1256
1257           ip4_full_reass_t *reass = ip4_full_reass_find_or_create (
1258             vm, node, rm, rt, &kv, &do_handoff, &n_left_to_next, &to_next);
1259
1260           if (reass)
1261             {
1262               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1263               if (0 == fragment_first)
1264                 {
1265                   reass->sendout_thread_index = vm->thread_index;
1266                 }
1267             }
1268
1269           if (PREDICT_FALSE (do_handoff))
1270             {
1271               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1272               vnet_buffer (b0)->ip.reass.owner_thread_index =
1273                 kv.v.memory_owner_thread_index;
1274             }
1275           else if (reass)
1276             {
1277               u32 handoff_thread_idx;
1278               u32 counter = ~0;
1279               switch (ip4_full_reass_update
1280                       (vm, node, rm, rt, reass, &bi0, &next0,
1281                        &error0, CUSTOM == type, &handoff_thread_idx))
1282                 {
1283                 case IP4_REASS_RC_OK:
1284                   /* nothing to do here */
1285                   break;
1286                 case IP4_REASS_RC_HANDOFF:
1287                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1288                   b0 = vlib_get_buffer (vm, bi0);
1289                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1290                     handoff_thread_idx;
1291                   break;
1292                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1293                   counter = IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
1294                   break;
1295                 case IP4_REASS_RC_NO_BUF:
1296                   counter = IP4_ERROR_REASS_NO_BUF;
1297                   break;
1298                 case IP4_REASS_RC_INTERNAL_ERROR:
1299                   counter = IP4_ERROR_REASS_INTERNAL_ERROR;
1300                   /* Sanitization is needed in internal error cases only, as
1301                    * the incoming packet is already dropped in other cases,
1302                    * also adding bi0 back to the reassembly list, fixes the
1303                    * leaking of buffers during internal errors.
1304                    *
1305                    * Also it doesnt make sense to send these buffers custom
1306                    * app, these fragments are with internal errors */
1307                   sanitize_reass_buffers_add_missing (vm, reass, &bi0);
1308                   reass->error_next_index = ~0;
1309                   break;
1310                 }
1311
1312               if (~0 != counter)
1313                 {
1314                   vlib_node_increment_counter (vm, node->node_index, counter,
1315                                                1);
1316                   ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1317                                            &to_next);
1318                   ip4_full_reass_free (rm, rt, reass);
1319                   goto next_packet;
1320                 }
1321             }
1322           else
1323             {
1324               next0 = IP4_FULL_REASS_NEXT_DROP;
1325               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1326             }
1327
1328
1329         packet_enqueue:
1330
1331           if (bi0 != ~0)
1332             {
1333               to_next[0] = bi0;
1334               to_next += 1;
1335               n_left_to_next -= 1;
1336
1337               /* bi0 might have been updated by reass_finalize, reload */
1338               b0 = vlib_get_buffer (vm, bi0);
1339               if (IP4_ERROR_NONE != error0)
1340                 {
1341                   b0->error = node->errors[error0];
1342                 }
1343
1344               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1345                 {
1346                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1347                     {
1348                       ip4_full_reass_add_trace (
1349                         vm, node, NULL, bi0, HANDOFF, 0,
1350                         vnet_buffer (b0)->ip.reass.owner_thread_index);
1351                     }
1352                 }
1353               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1354                 {
1355                   vnet_feature_next (&next0, b0);
1356                 }
1357
1358               /* Increment the counter to-custom-app also as this fragment is
1359                * also going to application */
1360               if (CUSTOM == type)
1361                 {
1362                   vlib_node_increment_counter (
1363                     vm, node->node_index, IP4_ERROR_REASS_TO_CUSTOM_APP, 1);
1364                 }
1365
1366               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1367                                                to_next, n_left_to_next,
1368                                                bi0, next0);
1369               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1370             }
1371
1372         next_packet:
1373           from += 1;
1374           n_left_from -= 1;
1375         }
1376
1377       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1378     }
1379
1380   clib_spinlock_unlock (&rt->lock);
1381   return frame->n_vectors;
1382 }
1383
1384 static char *ip4_full_reass_error_strings[] = {
1385 #define _(sym, string) string,
1386   foreach_ip4_error
1387 #undef _
1388 };
1389
1390 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1391                                     vlib_node_runtime_t * node,
1392                                     vlib_frame_t * frame)
1393 {
1394   return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
1395 }
1396
1397 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1398     .name = "ip4-full-reassembly",
1399     .vector_size = sizeof (u32),
1400     .format_trace = format_ip4_full_reass_trace,
1401     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1402     .error_strings = ip4_full_reass_error_strings,
1403     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1404     .next_nodes =
1405         {
1406                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1407                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1408                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1409
1410         },
1411 };
1412
1413 VLIB_NODE_FN (ip4_local_full_reass_node)
1414 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1415 {
1416   return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
1417 }
1418
1419 VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
1420     .name = "ip4-local-full-reassembly",
1421     .vector_size = sizeof (u32),
1422     .format_trace = format_ip4_full_reass_trace,
1423     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1424     .error_strings = ip4_full_reass_error_strings,
1425     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1426     .next_nodes =
1427         {
1428                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1429                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1430                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
1431
1432         },
1433 };
1434
1435 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1436                                             vlib_node_runtime_t * node,
1437                                             vlib_frame_t * frame)
1438 {
1439   return ip4_full_reass_inline (vm, node, frame, FEATURE,
1440                                 false /* is_local */);
1441 }
1442
1443 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1444     .name = "ip4-full-reassembly-feature",
1445     .vector_size = sizeof (u32),
1446     .format_trace = format_ip4_full_reass_trace,
1447     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1448     .error_strings = ip4_full_reass_error_strings,
1449     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1450     .next_nodes =
1451         {
1452                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1453                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1454                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1455         },
1456 };
1457
1458 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1459     .arc_name = "ip4-unicast",
1460     .node_name = "ip4-full-reassembly-feature",
1461     .runs_before = VNET_FEATURES ("ip4-lookup",
1462                                   "ipsec4-input-feature"),
1463     .runs_after = 0,
1464 };
1465
1466 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1467                                            vlib_node_runtime_t * node,
1468                                            vlib_frame_t * frame)
1469 {
1470   return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
1471 }
1472
1473 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1474     .name = "ip4-full-reassembly-custom",
1475     .vector_size = sizeof (u32),
1476     .format_trace = format_ip4_full_reass_trace,
1477     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1478     .error_strings = ip4_full_reass_error_strings,
1479     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1480     .next_nodes =
1481         {
1482                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1483                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1484                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1485         },
1486 };
1487
1488 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1489     .arc_name = "ip4-unicast",
1490     .node_name = "ip4-full-reassembly-feature",
1491     .runs_before = VNET_FEATURES ("ip4-lookup",
1492                                   "ipsec4-input-feature"),
1493     .runs_after = 0,
1494 };
1495
1496
1497 #ifndef CLIB_MARCH_VARIANT
1498 uword
1499 ip4_full_reass_custom_register_next_node (uword node_index)
1500 {
1501   return vlib_node_add_next (vlib_get_main (),
1502                              ip4_full_reass_node_custom.index, node_index);
1503 }
1504
1505 always_inline u32
1506 ip4_full_reass_get_nbuckets ()
1507 {
1508   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1509   u32 nbuckets;
1510   u8 i;
1511
1512   /* need more mem with more workers */
1513   nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
1514                     IP4_REASS_HT_LOAD_FACTOR);
1515
1516   for (i = 0; i < 31; i++)
1517     if ((1 << i) >= nbuckets)
1518       break;
1519   nbuckets = 1 << i;
1520
1521   return nbuckets;
1522 }
1523 #endif /* CLIB_MARCH_VARIANT */
1524
1525 typedef enum
1526 {
1527   IP4_EVENT_CONFIG_CHANGED = 1,
1528 } ip4_full_reass_event_t;
1529
1530 typedef struct
1531 {
1532   int failure;
1533   clib_bihash_16_8_t *new_hash;
1534 } ip4_rehash_cb_ctx;
1535
1536 #ifndef CLIB_MARCH_VARIANT
1537 static int
1538 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1539 {
1540   ip4_rehash_cb_ctx *ctx = _ctx;
1541   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1542     {
1543       ctx->failure = 1;
1544     }
1545   return (BIHASH_WALK_CONTINUE);
1546 }
1547
1548 static void
1549 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1550                            u32 max_reassembly_length,
1551                            u32 expire_walk_interval_ms)
1552 {
1553   ip4_full_reass_main.timeout_ms = timeout_ms;
1554   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1555   ip4_full_reass_main.max_reass_n = max_reassemblies;
1556   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1557   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1558 }
1559
1560 vnet_api_error_t
1561 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1562                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1563 {
1564   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1565   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1566                              max_reassembly_length, expire_walk_interval_ms);
1567   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1568                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1569                              IP4_EVENT_CONFIG_CHANGED, 0);
1570   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1571   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1572     {
1573       clib_bihash_16_8_t new_hash;
1574       clib_memset (&new_hash, 0, sizeof (new_hash));
1575       ip4_rehash_cb_ctx ctx;
1576       ctx.failure = 0;
1577       ctx.new_hash = &new_hash;
1578       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1579                              new_nbuckets * 1024);
1580       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1581                                                ip4_rehash_cb, &ctx);
1582       if (ctx.failure)
1583         {
1584           clib_bihash_free_16_8 (&new_hash);
1585           return -1;
1586         }
1587       else
1588         {
1589           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1590           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1591                             sizeof (ip4_full_reass_main.hash));
1592           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1593         }
1594     }
1595   return 0;
1596 }
1597
1598 vnet_api_error_t
1599 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1600                     u32 * max_reassembly_length,
1601                     u32 * expire_walk_interval_ms)
1602 {
1603   *timeout_ms = ip4_full_reass_main.timeout_ms;
1604   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1605   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1606   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1607   return 0;
1608 }
1609
1610 static clib_error_t *
1611 ip4_full_reass_init_function (vlib_main_t * vm)
1612 {
1613   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1614   clib_error_t *error = 0;
1615   u32 nbuckets;
1616   vlib_node_t *node;
1617
1618   rm->vlib_main = vm;
1619
1620   vec_validate (rm->per_thread_data, vlib_num_workers ());
1621   ip4_full_reass_per_thread_t *rt;
1622   vec_foreach (rt, rm->per_thread_data)
1623   {
1624     clib_spinlock_init (&rt->lock);
1625     pool_alloc (rt->pool, rm->max_reass_n);
1626   }
1627
1628   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1629   ASSERT (node);
1630   rm->ip4_full_reass_expire_node_idx = node->index;
1631
1632   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1633                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1634                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1635                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1636
1637   nbuckets = ip4_full_reass_get_nbuckets ();
1638   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1639
1640   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1641   rm->fq_local_index =
1642     vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
1643   rm->fq_feature_index =
1644     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1645   rm->fq_custom_index =
1646     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1647
1648   rm->feature_use_refcount_per_intf = NULL;
1649   rm->is_local_reass_enabled = 1;
1650
1651   return error;
1652 }
1653
1654 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1655 #endif /* CLIB_MARCH_VARIANT */
1656
1657 static uword
1658 ip4_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
1659                              CLIB_UNUSED (vlib_frame_t *f))
1660 {
1661   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1662   uword event_type, *event_data = 0;
1663
1664   while (true)
1665     {
1666       vlib_process_wait_for_event_or_clock (vm,
1667                                             (f64)
1668                                             rm->expire_walk_interval_ms /
1669                                             (f64) MSEC_PER_SEC);
1670       event_type = vlib_process_get_events (vm, &event_data);
1671
1672       switch (event_type)
1673         {
1674         case ~0:
1675           /* no events => timeout */
1676           /* fallthrough */
1677         case IP4_EVENT_CONFIG_CHANGED:
1678           /* nothing to do here */
1679           break;
1680         default:
1681           clib_warning ("BUG: event type 0x%wx", event_type);
1682           break;
1683         }
1684       f64 now = vlib_time_now (vm);
1685
1686       ip4_full_reass_t *reass;
1687       int *pool_indexes_to_free = NULL;
1688
1689       uword thread_index = 0;
1690       int index;
1691       const uword nthreads = vlib_num_workers () + 1;
1692       u32 n_left_to_next, *to_next;
1693
1694       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1695         {
1696           ip4_full_reass_per_thread_t *rt =
1697             &rm->per_thread_data[thread_index];
1698           clib_spinlock_lock (&rt->lock);
1699
1700           vec_reset_length (pool_indexes_to_free);
1701
1702           pool_foreach_index (index, rt->pool)
1703             {
1704               reass = pool_elt_at_index (rt->pool, index);
1705               if (now > reass->last_heard + rm->timeout)
1706                 {
1707                   vec_add1 (pool_indexes_to_free, index);
1708                 }
1709             }
1710
1711           if (vec_len (pool_indexes_to_free))
1712             vlib_node_increment_counter (vm, node->node_index,
1713                                          IP4_ERROR_REASS_TIMEOUT,
1714                                          vec_len (pool_indexes_to_free));
1715           int *i;
1716           vec_foreach (i, pool_indexes_to_free)
1717           {
1718             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1719             ip4_full_reass_drop_all (vm, node, reass, &n_left_to_next,
1720                                      &to_next);
1721             ip4_full_reass_free (rm, rt, reass);
1722           }
1723
1724           clib_spinlock_unlock (&rt->lock);
1725         }
1726
1727       vec_free (pool_indexes_to_free);
1728       if (event_data)
1729         {
1730           vec_set_len (event_data, 0);
1731         }
1732     }
1733
1734   return 0;
1735 }
1736
1737 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1738     .function = ip4_full_reass_walk_expired,
1739     .type = VLIB_NODE_TYPE_PROCESS,
1740     .name = "ip4-full-reassembly-expire-walk",
1741     .format_trace = format_ip4_full_reass_trace,
1742     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1743     .error_strings = ip4_full_reass_error_strings,
1744
1745 };
1746
1747 static u8 *
1748 format_ip4_full_reass_key (u8 * s, va_list * args)
1749 {
1750   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1751   s =
1752     format (s,
1753             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1754             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1755             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1756   return s;
1757 }
1758
1759 static u8 *
1760 format_ip4_reass (u8 * s, va_list * args)
1761 {
1762   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1763   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1764
1765   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1766               "last_packet_octet: %u, trace_op_counter: %u\n",
1767               reass->id, format_ip4_full_reass_key, &reass->key,
1768               reass->first_bi, reass->data_len,
1769               reass->last_packet_octet, reass->trace_op_counter);
1770
1771   u32 bi = reass->first_bi;
1772   u32 counter = 0;
1773   while (~0 != bi)
1774     {
1775       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1776       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1777       s =
1778         format (s,
1779                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1780                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1781                 vnb->ip.reass.range_last, bi,
1782                 ip4_full_reass_buffer_get_data_offset (b),
1783                 ip4_full_reass_buffer_get_data_len (b),
1784                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1785       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1786         {
1787           bi = b->next_buffer;
1788         }
1789       else
1790         {
1791           bi = ~0;
1792         }
1793     }
1794   return s;
1795 }
1796
1797 static clib_error_t *
1798 show_ip4_reass (vlib_main_t * vm,
1799                 unformat_input_t * input,
1800                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1801 {
1802   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1803
1804   vlib_cli_output (vm, "---------------------");
1805   vlib_cli_output (vm, "IP4 reassembly status");
1806   vlib_cli_output (vm, "---------------------");
1807   bool details = false;
1808   if (unformat (input, "details"))
1809     {
1810       details = true;
1811     }
1812
1813   u32 sum_reass_n = 0;
1814   ip4_full_reass_t *reass;
1815   uword thread_index;
1816   const uword nthreads = vlib_num_workers () + 1;
1817   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1818     {
1819       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1820       clib_spinlock_lock (&rt->lock);
1821       if (details)
1822         {
1823           pool_foreach (reass, rt->pool) {
1824             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1825           }
1826         }
1827       sum_reass_n += rt->reass_n;
1828       clib_spinlock_unlock (&rt->lock);
1829     }
1830   vlib_cli_output (vm, "---------------------");
1831   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1832                    (long unsigned) sum_reass_n);
1833   vlib_cli_output (vm,
1834                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1835                    (long unsigned) rm->max_reass_n);
1836   vlib_cli_output (vm,
1837                    "Maximum configured amount of fragments "
1838                    "per full IP4 reassembly: %lu\n",
1839                    (long unsigned) rm->max_reass_len);
1840   vlib_cli_output (vm,
1841                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1842                    (long unsigned) rm->timeout_ms);
1843   vlib_cli_output (vm,
1844                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1845                    (long unsigned) rm->expire_walk_interval_ms);
1846   return 0;
1847 }
1848
1849 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1850     .path = "show ip4-full-reassembly",
1851     .short_help = "show ip4-full-reassembly [details]",
1852     .function = show_ip4_reass,
1853 };
1854
1855 #ifndef CLIB_MARCH_VARIANT
1856 vnet_api_error_t
1857 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1858 {
1859   return vnet_feature_enable_disable ("ip4-unicast",
1860                                       "ip4-full-reassembly-feature",
1861                                       sw_if_index, enable_disable, 0, 0);
1862 }
1863 #endif /* CLIB_MARCH_VARIANT */
1864
1865
1866 #define foreach_ip4_full_reass_handoff_error                       \
1867 _(CONGESTION_DROP, "congestion drop")
1868
1869
1870 typedef enum
1871 {
1872 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1873   foreach_ip4_full_reass_handoff_error
1874 #undef _
1875     IP4_FULL_REASS_HANDOFF_N_ERROR,
1876 } ip4_full_reass_handoff_error_t;
1877
1878 static char *ip4_full_reass_handoff_error_strings[] = {
1879 #define _(sym,string) string,
1880   foreach_ip4_full_reass_handoff_error
1881 #undef _
1882 };
1883
1884 typedef struct
1885 {
1886   u32 next_worker_index;
1887 } ip4_full_reass_handoff_trace_t;
1888
1889 static u8 *
1890 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1891 {
1892   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1893   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1894   ip4_full_reass_handoff_trace_t *t =
1895     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1896
1897   s =
1898     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1899             t->next_worker_index);
1900
1901   return s;
1902 }
1903
1904 always_inline uword
1905 ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
1906                                     vlib_frame_t *frame,
1907                                     ip4_full_reass_node_type_t type,
1908                                     bool is_local)
1909 {
1910   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1911
1912   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1913   u32 n_enq, n_left_from, *from;
1914   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1915   u32 fq_index;
1916
1917   from = vlib_frame_vector_args (frame);
1918   n_left_from = frame->n_vectors;
1919   vlib_get_buffers (vm, from, bufs, n_left_from);
1920
1921   b = bufs;
1922   ti = thread_indices;
1923
1924   switch (type)
1925     {
1926     case NORMAL:
1927       if (is_local)
1928         {
1929           fq_index = rm->fq_local_index;
1930         }
1931       else
1932         {
1933           fq_index = rm->fq_index;
1934         }
1935       break;
1936     case FEATURE:
1937       fq_index = rm->fq_feature_index;
1938       break;
1939     case CUSTOM:
1940       fq_index = rm->fq_custom_index;
1941       break;
1942     default:
1943       clib_warning ("Unexpected `type' (%d)!", type);
1944     }
1945
1946   while (n_left_from > 0)
1947     {
1948       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1949
1950       if (PREDICT_FALSE
1951           ((node->flags & VLIB_NODE_FLAG_TRACE)
1952            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1953         {
1954           ip4_full_reass_handoff_trace_t *t =
1955             vlib_add_trace (vm, node, b[0], sizeof (*t));
1956           t->next_worker_index = ti[0];
1957         }
1958
1959       n_left_from -= 1;
1960       ti += 1;
1961       b += 1;
1962     }
1963   n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
1964                                          thread_indices, frame->n_vectors, 1);
1965
1966   if (n_enq < frame->n_vectors)
1967     vlib_node_increment_counter (vm, node->node_index,
1968                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1969                                  frame->n_vectors - n_enq);
1970   return frame->n_vectors;
1971 }
1972
1973 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1974                                             vlib_node_runtime_t * node,
1975                                             vlib_frame_t * frame)
1976 {
1977   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
1978                                              false /* is_local */);
1979 }
1980
1981
1982 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1983   .name = "ip4-full-reassembly-handoff",
1984   .vector_size = sizeof (u32),
1985   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1986   .error_strings = ip4_full_reass_handoff_error_strings,
1987   .format_trace = format_ip4_full_reass_handoff_trace,
1988
1989   .n_next_nodes = 1,
1990
1991   .next_nodes = {
1992     [0] = "error-drop",
1993   },
1994 };
1995
1996 VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
1997 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
1998 {
1999   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
2000                                              true /* is_local */);
2001 }
2002
2003 VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
2004   .name = "ip4-local-full-reassembly-handoff",
2005   .vector_size = sizeof (u32),
2006   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2007   .error_strings = ip4_full_reass_handoff_error_strings,
2008   .format_trace = format_ip4_full_reass_handoff_trace,
2009
2010   .n_next_nodes = 1,
2011
2012   .next_nodes = {
2013     [0] = "error-drop",
2014   },
2015 };
2016
2017 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
2018                                                     vlib_node_runtime_t *
2019                                                     node,
2020                                                     vlib_frame_t * frame)
2021 {
2022   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
2023                                              false /* is_local */);
2024 }
2025
2026 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
2027   .name = "ip4-full-reass-feature-hoff",
2028   .vector_size = sizeof (u32),
2029   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2030   .error_strings = ip4_full_reass_handoff_error_strings,
2031   .format_trace = format_ip4_full_reass_handoff_trace,
2032
2033   .n_next_nodes = 1,
2034
2035   .next_nodes = {
2036     [0] = "error-drop",
2037   },
2038 };
2039
2040 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
2041                                                     vlib_node_runtime_t *
2042                                                     node,
2043                                                     vlib_frame_t * frame)
2044 {
2045   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
2046                                              false /* is_local */);
2047 }
2048
2049 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
2050   .name = "ip4-full-reass-custom-hoff",
2051   .vector_size = sizeof (u32),
2052   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
2053   .error_strings = ip4_full_reass_handoff_error_strings,
2054   .format_trace = format_ip4_full_reass_handoff_trace,
2055
2056   .n_next_nodes = 1,
2057
2058   .next_nodes = {
2059     [0] = "error-drop",
2060   },
2061 };
2062
2063 #ifndef CLIB_MARCH_VARIANT
2064 int
2065 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
2066 {
2067   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
2068   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
2069   if (is_enable)
2070     {
2071       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2072         {
2073           ++rm->feature_use_refcount_per_intf[sw_if_index];
2074           return vnet_feature_enable_disable ("ip4-unicast",
2075                                               "ip4-full-reassembly-feature",
2076                                               sw_if_index, 1, 0, 0);
2077         }
2078       ++rm->feature_use_refcount_per_intf[sw_if_index];
2079     }
2080   else
2081     {
2082       --rm->feature_use_refcount_per_intf[sw_if_index];
2083       if (!rm->feature_use_refcount_per_intf[sw_if_index])
2084         return vnet_feature_enable_disable ("ip4-unicast",
2085                                             "ip4-full-reassembly-feature",
2086                                             sw_if_index, 0, 0, 0);
2087     }
2088   return -1;
2089 }
2090
2091 void
2092 ip4_local_full_reass_enable_disable (int enable)
2093 {
2094   if (enable)
2095     {
2096       ip4_full_reass_main.is_local_reass_enabled = 1;
2097     }
2098   else
2099     {
2100       ip4_full_reass_main.is_local_reass_enabled = 0;
2101     }
2102 }
2103
2104 int
2105 ip4_local_full_reass_enabled ()
2106 {
2107   return ip4_full_reass_main.is_local_reass_enabled;
2108 }
2109
2110 #endif
2111
2112 /*
2113  * fd.io coding-style-patch-verification: ON
2114  *
2115  * Local Variables:
2116  * eval: (c-set-style "gnu")
2117  * End:
2118  */