src/vnet/ip/reass/ip4_full_reass.c

   1 /*
   2  * Copyright (c) 2017 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 /**
  17  * @file
  18  * @brief IPv4 Full Reassembly.
  19  *
  20  * This file contains the source code for IPv4 full reassembly.
  21  */
  22
  23 #include <vppinfra/vec.h>
  24 #include <vnet/vnet.h>
  25 #include <vnet/ip/ip.h>
  26 #include <vppinfra/fifo.h>
  27 #include <vppinfra/bihash_16_8.h>
  28 #include <vnet/ip/reass/ip4_full_reass.h>
  29 #include <stddef.h>
  30
  31 #define MSEC_PER_SEC 1000
  32 #define IP4_REASS_TIMEOUT_DEFAULT_MS 100
  33 #define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
  34 #define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
  35 #define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
  36 #define IP4_REASS_HT_LOAD_FACTOR (0.75)
  37
  38 #define IP4_REASS_DEBUG_BUFFERS 0
  39 #if IP4_REASS_DEBUG_BUFFERS
  40 #define IP4_REASS_DEBUG_BUFFER(bi, what)             \
  41   do                                                 \
  42     {                                                \
  43       u32 _bi = bi;                                  \
  44       printf (#what "buffer %u", _bi);               \
  45       vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
  46       while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)   \
  47         {                                            \
  48           _bi = _b->next_buffer;                     \
  49           printf ("[%u]", _bi);                      \
  50           _b = vlib_get_buffer (vm, _bi);            \
  51         }                                            \
  52       printf ("\n");                                 \
  53       fflush (stdout);                               \
  54     }                                                \
  55   while (0)
  56 #else
  57 #define IP4_REASS_DEBUG_BUFFER(...)
  58 #endif
  59
  60 typedef enum
  61 {
  62   IP4_REASS_RC_OK,
  63   IP4_REASS_RC_TOO_MANY_FRAGMENTS,
  64   IP4_REASS_RC_INTERNAL_ERROR,
  65   IP4_REASS_RC_NO_BUF,
  66   IP4_REASS_RC_HANDOFF,
  67 } ip4_full_reass_rc_t;
  68
  69 typedef struct
  70 {
  71   union
  72   {
  73     struct
  74     {
  75       u32 xx_id;
  76       ip4_address_t src;
  77       ip4_address_t dst;
  78       u16 frag_id;
  79       u8 proto;
  80       u8 unused;
  81     };
  82     u64 as_u64[2];
  83   };
  84 } ip4_full_reass_key_t;
  85
  86 typedef union
  87 {
  88   struct
  89   {
  90     u32 reass_index;
  91     u32 memory_owner_thread_index;
  92   };
  93   u64 as_u64;
  94 } ip4_full_reass_val_t;
  95
  96 typedef union
  97 {
  98   struct
  99   {
 100     ip4_full_reass_key_t k;
 101     ip4_full_reass_val_t v;
 102   };
 103   clib_bihash_kv_16_8_t kv;
 104 } ip4_full_reass_kv_t;
 105
 106 always_inline u32
 107 ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
 108 {
 109   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 110   return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
 111 }
 112
 113 always_inline u16
 114 ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
 115 {
 116   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 117   return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
 118     (vnb->ip.reass.fragment_first +
 119      ip4_full_reass_buffer_get_data_offset (b)) + 1;
 120 }
 121
 122 typedef struct
 123 {
 124   // hash table key
 125   ip4_full_reass_key_t key;
 126   // time when last packet was received
 127   f64 last_heard;
 128   // internal id of this reassembly
 129   u64 id;
 130   // buffer index of first buffer in this reassembly context
 131   u32 first_bi;
 132   // last octet of packet, ~0 until fragment without more_fragments arrives
 133   u32 last_packet_octet;
 134   // length of data collected so far
 135   u32 data_len;
 136   // trace operation counter
 137   u32 trace_op_counter;
 138   // next index - used by non-feature node
 139   u32 next_index;
 140   // error next index - used by custom apps (~0 if not used)
 141   u32 error_next_index;
 142   // minimum fragment length for this reassembly - used to estimate MTU
 143   u16 min_fragment_length;
 144   // number of fragments in this reassembly
 145   u32 fragments_n;
 146   // thread owning memory for this context (whose pool contains this ctx)
 147   u32 memory_owner_thread_index;
 148   // thread which received fragment with offset 0 and which sends out the
 149   // completed reassembly
 150   u32 sendout_thread_index;
 151 } ip4_full_reass_t;
 152
 153 typedef struct
 154 {
 155   ip4_full_reass_t *pool;
 156   u32 reass_n;
 157   u32 id_counter;
 158   clib_spinlock_t lock;
 159 } ip4_full_reass_per_thread_t;
 160
 161 typedef struct
 162 {
 163   // IPv4 config
 164   u32 timeout_ms;
 165   f64 timeout;
 166   u32 expire_walk_interval_ms;
 167   // maximum number of fragments in one reassembly
 168   u32 max_reass_len;
 169   // maximum number of reassemblies
 170   u32 max_reass_n;
 171
 172   // IPv4 runtime
 173   clib_bihash_16_8_t hash;
 174   // per-thread data
 175   ip4_full_reass_per_thread_t *per_thread_data;
 176
 177   // convenience
 178   vlib_main_t *vlib_main;
 179
 180   // node index of ip4-drop node
 181   u32 ip4_drop_idx;
 182   u32 ip4_full_reass_expire_node_idx;
 183
 184   /** Worker handoff */
 185   u32 fq_index;
 186   u32 fq_feature_index;
 187   u32 fq_custom_index;
 188
 189   // reference count for enabling/disabling feature - per interface
 190   u32 *feature_use_refcount_per_intf;
 191 } ip4_full_reass_main_t;
 192
 193 extern ip4_full_reass_main_t ip4_full_reass_main;
 194
 195 #ifndef CLIB_MARCH_VARIANT
 196 ip4_full_reass_main_t ip4_full_reass_main;
 197 #endif /* CLIB_MARCH_VARIANT */
 198
 199 typedef enum
 200 {
 201   IP4_FULL_REASS_NEXT_INPUT,
 202   IP4_FULL_REASS_NEXT_DROP,
 203   IP4_FULL_REASS_NEXT_HANDOFF,
 204   IP4_FULL_REASS_N_NEXT,
 205 } ip4_full_reass_next_t;
 206
 207 typedef enum
 208 {
 209   NORMAL,
 210   FEATURE,
 211   CUSTOM
 212 } ip4_full_reass_node_type_t;
 213
 214 typedef enum
 215 {
 216   RANGE_NEW,
 217   RANGE_SHRINK,
 218   RANGE_DISCARD,
 219   RANGE_OVERLAP,
 220   FINALIZE,
 221   HANDOFF,
 222 } ip4_full_reass_trace_operation_e;
 223
 224 typedef struct
 225 {
 226   u16 range_first;
 227   u16 range_last;
 228   u32 range_bi;
 229   i32 data_offset;
 230   u32 data_len;
 231   u32 first_bi;
 232 } ip4_full_reass_range_trace_t;
 233
 234 typedef struct
 235 {
 236   ip4_full_reass_trace_operation_e action;
 237   u32 reass_id;
 238   ip4_full_reass_range_trace_t trace_range;
 239   u32 size_diff;
 240   u32 op_id;
 241   u32 thread_id;
 242   u32 thread_id_to;
 243   u32 fragment_first;
 244   u32 fragment_last;
 245   u32 total_data_len;
 246   bool is_after_handoff;
 247   ip4_header_t ip4_header;
 248 } ip4_full_reass_trace_t;
 249
 250 extern vlib_node_registration_t ip4_full_reass_node;
 251 extern vlib_node_registration_t ip4_full_reass_node_feature;
 252 extern vlib_node_registration_t ip4_full_reass_node_custom;
 253
 254 static void
 255 ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
 256                               ip4_full_reass_range_trace_t * trace)
 257 {
 258   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 259   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 260   trace->range_first = vnb->ip.reass.range_first;
 261   trace->range_last = vnb->ip.reass.range_last;
 262   trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
 263   trace->data_len = ip4_full_reass_buffer_get_data_len (b);
 264   trace->range_bi = bi;
 265 }
 266
 267 static u8 *
 268 format_ip4_full_reass_range_trace (u8 * s, va_list * args)
 269 {
 270   ip4_full_reass_range_trace_t *trace =
 271     va_arg (*args, ip4_full_reass_range_trace_t *);
 272   s =
 273     format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
 274             trace->range_last, trace->data_offset, trace->data_len,
 275             trace->range_bi);
 276   return s;
 277 }
 278
 279 static u8 *
 280 format_ip4_full_reass_trace (u8 * s, va_list * args)
 281 {
 282   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
 283   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
 284   ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
 285   u32 indent = 0;
 286   if (~0 != t->reass_id)
 287     {
 288       if (t->is_after_handoff)
 289         {
 290           s =
 291             format (s, "%U\n", format_ip4_header, &t->ip4_header,
 292                     sizeof (t->ip4_header));
 293           indent = 2;
 294         }
 295       s =
 296         format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
 297                 t->reass_id, t->op_id);
 298       indent = format_get_indent (s);
 299       s =
 300         format (s,
 301                 "first bi: %u, data len: %u, ip/fragment[%u, %u]",
 302                 t->trace_range.first_bi, t->total_data_len, t->fragment_first,
 303                 t->fragment_last);
 304     }
 305   switch (t->action)
 306     {
 307     case RANGE_SHRINK:
 308       s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
 309                   format_ip4_full_reass_range_trace, &t->trace_range,
 310                   t->size_diff);
 311       break;
 312     case RANGE_DISCARD:
 313       s = format (s, "\n%Udiscard %U", format_white_space, indent,
 314                   format_ip4_full_reass_range_trace, &t->trace_range);
 315       break;
 316     case RANGE_NEW:
 317       s = format (s, "\n%Unew %U", format_white_space, indent,
 318                   format_ip4_full_reass_range_trace, &t->trace_range);
 319       break;
 320     case RANGE_OVERLAP:
 321       s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
 322                   format_ip4_full_reass_range_trace, &t->trace_range);
 323       break;
 324     case FINALIZE:
 325       s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
 326       break;
 327     case HANDOFF:
 328       s =
 329         format (s, "handoff from thread #%u to thread #%u", t->thread_id,
 330                 t->thread_id_to);
 331       break;
 332     }
 333   return s;
 334 }
 335
 336 static void
 337 ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
 338                           ip4_full_reass_main_t * rm,
 339                           ip4_full_reass_t * reass, u32 bi,
 340                           ip4_full_reass_trace_operation_e action,
 341                           u32 size_diff, u32 thread_id_to)
 342 {
 343   vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 344   vnet_buffer_opaque_t *vnb = vnet_buffer (b);
 345   bool is_after_handoff = false;
 346   if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
 347     {
 348       is_after_handoff = true;
 349     }
 350   ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
 351   t->is_after_handoff = is_after_handoff;
 352   if (t->is_after_handoff)
 353     {
 354       clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
 355                    clib_min (sizeof (t->ip4_header), b->current_length));
 356     }
 357   if (reass)
 358     {
 359       t->reass_id = reass->id;
 360       t->op_id = reass->trace_op_counter;
 361       t->trace_range.first_bi = reass->first_bi;
 362       t->total_data_len = reass->data_len;
 363       ++reass->trace_op_counter;
 364     }
 365   else
 366     {
 367       t->reass_id = ~0;
 368       t->op_id = 0;
 369       t->trace_range.first_bi = 0;
 370       t->total_data_len = 0;
 371     }
 372   t->action = action;
 373   ip4_full_reass_trace_details (vm, bi, &t->trace_range);
 374   t->size_diff = size_diff;
 375   t->thread_id = vm->thread_index;
 376   t->thread_id_to = thread_id_to;
 377   t->fragment_first = vnb->ip.reass.fragment_first;
 378   t->fragment_last = vnb->ip.reass.fragment_last;
 379 #if 0
 380   static u8 *s = NULL;
 381   s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
 382   printf ("%.*s\n", vec_len (s), s);
 383   fflush (stdout);
 384   vec_reset_length (s);
 385 #endif
 386 }
 387
 388 always_inline void
 389 ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
 390                          ip4_full_reass_t * reass)
 391 {
 392   pool_put (rt->pool, reass);
 393   --rt->reass_n;
 394 }
 395
 396 always_inline void
 397 ip4_full_reass_free (ip4_full_reass_main_t * rm,
 398                      ip4_full_reass_per_thread_t * rt,
 399                      ip4_full_reass_t * reass)
 400 {
 401   clib_bihash_kv_16_8_t kv;
 402   kv.key[0] = reass->key.as_u64[0];
 403   kv.key[1] = reass->key.as_u64[1];
 404   clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
 405   return ip4_full_reass_free_ctx (rt, reass);
 406 }
 407
 408 always_inline void
 409 ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
 410                          ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
 411 {
 412   u32 range_bi = reass->first_bi;
 413   vlib_buffer_t *range_b;
 414   vnet_buffer_opaque_t *range_vnb;
 415   u32 *to_free = NULL;
 416   while (~0 != range_bi)
 417     {
 418       range_b = vlib_get_buffer (vm, range_bi);
 419       range_vnb = vnet_buffer (range_b);
 420       u32 bi = range_bi;
 421       while (~0 != bi)
 422         {
 423           vec_add1 (to_free, bi);
 424           vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 425           if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 426             {
 427               bi = b->next_buffer;
 428               b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 429             }
 430           else
 431             {
 432               bi = ~0;
 433             }
 434         }
 435       range_bi = range_vnb->ip.reass.next_range_bi;
 436     }
 437   /* send to next_error_index */
 438   if (~0 != reass->error_next_index)
 439     {
 440       u32 n_left_to_next, *to_next, next_index;
 441
 442       next_index = reass->error_next_index;
 443       u32 bi = ~0;
 444
 445       while (vec_len (to_free) > 0)
 446         {
 447           vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 448
 449           while (vec_len (to_free) > 0 && n_left_to_next > 0)
 450             {
 451               bi = vec_pop (to_free);
 452
 453               if (~0 != bi)
 454                 {
 455                   to_next[0] = bi;
 456                   to_next += 1;
 457                   n_left_to_next -= 1;
 458                 }
 459             }
 460           vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 461         }
 462     }
 463   else
 464     {
 465       vlib_buffer_free (vm, to_free, vec_len (to_free));
 466     }
 467   vec_free (to_free);
 468 }
 469
 470 always_inline void
 471 ip4_full_reass_init (ip4_full_reass_t * reass)
 472 {
 473   reass->first_bi = ~0;
 474   reass->last_packet_octet = ~0;
 475   reass->data_len = 0;
 476   reass->next_index = ~0;
 477   reass->error_next_index = ~0;
 478 }
 479
 480 always_inline ip4_full_reass_t *
 481 ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
 482                                ip4_full_reass_main_t * rm,
 483                                ip4_full_reass_per_thread_t * rt,
 484                                ip4_full_reass_kv_t * kv, u8 * do_handoff)
 485 {
 486   ip4_full_reass_t *reass;
 487   f64 now;
 488
 489 again:
 490
 491   reass = NULL;
 492   now = vlib_time_now (vm);
 493   if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
 494     {
 495       if (vm->thread_index != kv->v.memory_owner_thread_index)
 496         {
 497           *do_handoff = 1;
 498           return NULL;
 499         }
 500       reass =
 501         pool_elt_at_index (rm->per_thread_data
 502                            [kv->v.memory_owner_thread_index].pool,
 503                            kv->v.reass_index);
 504
 505       if (now > reass->last_heard + rm->timeout)
 506         {
 507           ip4_full_reass_drop_all (vm, node, rm, reass);
 508           ip4_full_reass_free (rm, rt, reass);
 509           reass = NULL;
 510         }
 511     }
 512
 513   if (reass)
 514     {
 515       reass->last_heard = now;
 516       return reass;
 517     }
 518
 519   if (rt->reass_n >= rm->max_reass_n)
 520     {
 521       reass = NULL;
 522       return reass;
 523     }
 524   else
 525     {
 526       pool_get (rt->pool, reass);
 527       clib_memset (reass, 0, sizeof (*reass));
 528       reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
 529       reass->memory_owner_thread_index = vm->thread_index;
 530       ++rt->id_counter;
 531       ip4_full_reass_init (reass);
 532       ++rt->reass_n;
 533     }
 534
 535   reass->key.as_u64[0] = kv->kv.key[0];
 536   reass->key.as_u64[1] = kv->kv.key[1];
 537   kv->v.reass_index = (reass - rt->pool);
 538   kv->v.memory_owner_thread_index = vm->thread_index;
 539   reass->last_heard = now;
 540
 541   int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
 542   if (rv)
 543     {
 544       ip4_full_reass_free_ctx (rt, reass);
 545       reass = NULL;
 546       // if other worker created a context already work with the other copy
 547       if (-2 == rv)
 548         goto again;
 549     }
 550
 551   return reass;
 552 }
 553
 554 always_inline ip4_full_reass_rc_t
 555 ip4_full_reass_finalize (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_t * reass, u32 * bi0,
 559                          u32 * next0, u32 * error0, bool is_custom)
 560 {
 561   vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
 562   vlib_buffer_t *last_b = NULL;
 563   u32 sub_chain_bi = reass->first_bi;
 564   u32 total_length = 0;
 565   u32 buf_cnt = 0;
 566   do
 567     {
 568       u32 tmp_bi = sub_chain_bi;
 569       vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
 570       ip4_header_t *ip = vlib_buffer_get_current (tmp);
 571       vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
 572       if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 573           !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 574         {
 575           return IP4_REASS_RC_INTERNAL_ERROR;
 576         }
 577
 578       u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
 579       u32 trim_front =
 580         ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
 581       u32 trim_end =
 582         vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
 583       if (tmp_bi == reass->first_bi)
 584         {
 585           /* first buffer - keep ip4 header */
 586           if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
 587             {
 588               return IP4_REASS_RC_INTERNAL_ERROR;
 589             }
 590           trim_front = 0;
 591           trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
 592             ip4_header_bytes (ip);
 593           if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
 594             {
 595               return IP4_REASS_RC_INTERNAL_ERROR;
 596             }
 597         }
 598       u32 keep_data =
 599         vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
 600       while (1)
 601         {
 602           ++buf_cnt;
 603           if (trim_front)
 604             {
 605               if (trim_front > tmp->current_length)
 606                 {
 607                   /* drop whole buffer */
 608                   u32 to_be_freed_bi = tmp_bi;
 609                   trim_front -= tmp->current_length;
 610                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 611                     {
 612                       return IP4_REASS_RC_INTERNAL_ERROR;
 613                     }
 614                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 615                   tmp_bi = tmp->next_buffer;
 616                   tmp->next_buffer = 0;
 617                   tmp = vlib_get_buffer (vm, tmp_bi);
 618                   vlib_buffer_free_one (vm, to_be_freed_bi);
 619                   continue;
 620                 }
 621               else
 622                 {
 623                   vlib_buffer_advance (tmp, trim_front);
 624                   trim_front = 0;
 625                 }
 626             }
 627           if (keep_data)
 628             {
 629               if (last_b)
 630                 {
 631                   last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
 632                   last_b->next_buffer = tmp_bi;
 633                 }
 634               last_b = tmp;
 635               if (keep_data <= tmp->current_length)
 636                 {
 637                   tmp->current_length = keep_data;
 638                   keep_data = 0;
 639                 }
 640               else
 641                 {
 642                   keep_data -= tmp->current_length;
 643                   if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
 644                     {
 645                       return IP4_REASS_RC_INTERNAL_ERROR;
 646                     }
 647                 }
 648               total_length += tmp->current_length;
 649               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 650                 {
 651                   tmp_bi = tmp->next_buffer;
 652                   tmp = vlib_get_buffer (vm, tmp->next_buffer);
 653                 }
 654               else
 655                 {
 656                   break;
 657                 }
 658             }
 659           else
 660             {
 661               u32 to_be_freed_bi = tmp_bi;
 662               if (reass->first_bi == tmp_bi)
 663                 {
 664                   return IP4_REASS_RC_INTERNAL_ERROR;
 665                 }
 666               if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
 667                 {
 668                   tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 669                   tmp_bi = tmp->next_buffer;
 670                   tmp->next_buffer = 0;
 671                   tmp = vlib_get_buffer (vm, tmp_bi);
 672                   vlib_buffer_free_one (vm, to_be_freed_bi);
 673                 }
 674               else
 675                 {
 676                   tmp->next_buffer = 0;
 677                   vlib_buffer_free_one (vm, to_be_freed_bi);
 678                   break;
 679                 }
 680             }
 681         }
 682       sub_chain_bi =
 683         vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
 684         reass.next_range_bi;
 685     }
 686   while (~0 != sub_chain_bi);
 687
 688   if (!last_b)
 689     {
 690       return IP4_REASS_RC_INTERNAL_ERROR;
 691     }
 692   last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 693
 694   if (total_length < first_b->current_length)
 695     {
 696       return IP4_REASS_RC_INTERNAL_ERROR;
 697     }
 698   total_length -= first_b->current_length;
 699   first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 700   first_b->total_length_not_including_first_buffer = total_length;
 701   ip4_header_t *ip = vlib_buffer_get_current (first_b);
 702   ip->flags_and_fragment_offset = 0;
 703   ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
 704   ip->checksum = ip4_header_checksum (ip);
 705   if (!vlib_buffer_chain_linearize (vm, first_b))
 706     {
 707       return IP4_REASS_RC_NO_BUF;
 708     }
 709   // reset to reconstruct the mbuf linking
 710   first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
 711   if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
 712     {
 713       ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
 714                                 FINALIZE, 0, ~0);
 715 #if 0
 716       // following code does a hexdump of packet fragments to stdout ...
 717       do
 718         {
 719           u32 bi = reass->first_bi;
 720           u8 *s = NULL;
 721           while (~0 != bi)
 722             {
 723               vlib_buffer_t *b = vlib_get_buffer (vm, bi);
 724               s = format (s, "%u: %U\n", bi, format_hexdump,
 725                           vlib_buffer_get_current (b), b->current_length);
 726               if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
 727                 {
 728                   bi = b->next_buffer;
 729                 }
 730               else
 731                 {
 732                   break;
 733                 }
 734             }
 735           printf ("%.*s\n", vec_len (s), s);
 736           fflush (stdout);
 737           vec_free (s);
 738         }
 739       while (0);
 740 #endif
 741     }
 742   *bi0 = reass->first_bi;
 743   if (!is_custom)
 744     {
 745       *next0 = IP4_FULL_REASS_NEXT_INPUT;
 746     }
 747   else
 748     {
 749       *next0 = reass->next_index;
 750     }
 751   vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
 752   *error0 = IP4_ERROR_NONE;
 753   ip4_full_reass_free (rm, rt, reass);
 754   reass = NULL;
 755   return IP4_REASS_RC_OK;
 756 }
 757
 758 always_inline ip4_full_reass_rc_t
 759 ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
 760                                       ip4_full_reass_main_t * rm,
 761                                       ip4_full_reass_per_thread_t * rt,
 762                                       ip4_full_reass_t * reass,
 763                                       u32 prev_range_bi, u32 new_next_bi)
 764 {
 765   vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
 766   vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
 767   if (~0 != prev_range_bi)
 768     {
 769       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 770       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 771       new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
 772       prev_vnb->ip.reass.next_range_bi = new_next_bi;
 773     }
 774   else
 775     {
 776       if (~0 != reass->first_bi)
 777         {
 778           new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
 779         }
 780       reass->first_bi = new_next_bi;
 781     }
 782   vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
 783   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 784       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 785     {
 786       return IP4_REASS_RC_INTERNAL_ERROR;
 787     }
 788   reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
 789   return IP4_REASS_RC_OK;
 790 }
 791
 792 always_inline ip4_full_reass_rc_t
 793 ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
 794                                         vlib_node_runtime_t * node,
 795                                         ip4_full_reass_main_t * rm,
 796                                         ip4_full_reass_t * reass,
 797                                         u32 prev_range_bi, u32 discard_bi)
 798 {
 799   vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
 800   vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
 801   if (~0 != prev_range_bi)
 802     {
 803       vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
 804       vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
 805       if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
 806         {
 807           return IP4_REASS_RC_INTERNAL_ERROR;
 808         }
 809       prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
 810     }
 811   else
 812     {
 813       reass->first_bi = discard_vnb->ip.reass.next_range_bi;
 814     }
 815   vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
 816   if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
 817       !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
 818     {
 819       return IP4_REASS_RC_INTERNAL_ERROR;
 820     }
 821   reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
 822   while (1)
 823     {
 824       u32 to_be_freed_bi = discard_bi;
 825       if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
 826         {
 827           ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
 828                                     RANGE_DISCARD, 0, ~0);
 829         }
 830       if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
 831         {
 832           discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
 833           discard_bi = discard_b->next_buffer;
 834           discard_b->next_buffer = 0;
 835           discard_b = vlib_get_buffer (vm, discard_bi);
 836           vlib_buffer_free_one (vm, to_be_freed_bi);
 837         }
 838       else
 839         {
 840           discard_b->next_buffer = 0;
 841           vlib_buffer_free_one (vm, to_be_freed_bi);
 842           break;
 843         }
 844     }
 845   return IP4_REASS_RC_OK;
 846 }
 847
 848 always_inline ip4_full_reass_rc_t
 849 ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
 850                        ip4_full_reass_main_t * rm,
 851                        ip4_full_reass_per_thread_t * rt,
 852                        ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
 853                        u32 * error0, bool is_custom, u32 * handoff_thread_idx)
 854 {
 855   vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
 856   vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
 857   if (is_custom)
 858     {
 859       // store (error_)next_index before it's overwritten
 860       reass->next_index = fvnb->ip.reass.next_index;
 861       reass->error_next_index = fvnb->ip.reass.error_next_index;
 862     }
 863   ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
 864   int consumed = 0;
 865   ip4_header_t *fip = vlib_buffer_get_current (fb);
 866   const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
 867   const u32 fragment_length =
 868     clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
 869   const u32 fragment_last = fragment_first + fragment_length - 1;
 870   fvnb->ip.reass.fragment_first = fragment_first;
 871   fvnb->ip.reass.fragment_last = fragment_last;
 872   int more_fragments = ip4_get_fragment_more (fip);
 873   u32 candidate_range_bi = reass->first_bi;
 874   u32 prev_range_bi = ~0;
 875   fvnb->ip.reass.range_first = fragment_first;
 876   fvnb->ip.reass.range_last = fragment_last;
 877   fvnb->ip.reass.next_range_bi = ~0;
 878   if (!more_fragments)
 879     {
 880       reass->last_packet_octet = fragment_last;
 881     }
 882   if (~0 == reass->first_bi)
 883     {
 884       // starting a new reassembly
 885       rc =
 886         ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 887                                               prev_range_bi, *bi0);
 888       if (IP4_REASS_RC_OK != rc)
 889         {
 890           return rc;
 891         }
 892       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 893         {
 894           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
 895                                     ~0);
 896         }
 897       *bi0 = ~0;
 898       reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
 899       reass->fragments_n = 1;
 900       return IP4_REASS_RC_OK;
 901     }
 902   reass->min_fragment_length =
 903     clib_min (clib_net_to_host_u16 (fip->length),
 904               fvnb->ip.reass.estimated_mtu);
 905   while (~0 != candidate_range_bi)
 906     {
 907       vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
 908       vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
 909       if (fragment_first > candidate_vnb->ip.reass.range_last)
 910         {
 911           // this fragments starts after candidate range
 912           prev_range_bi = candidate_range_bi;
 913           candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
 914           if (candidate_vnb->ip.reass.range_last < fragment_last &&
 915               ~0 == candidate_range_bi)
 916             {
 917               // special case - this fragment falls beyond all known ranges
 918               rc =
 919                 ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 920                                                       prev_range_bi, *bi0);
 921               if (IP4_REASS_RC_OK != rc)
 922                 {
 923                   return rc;
 924                 }
 925               consumed = 1;
 926               break;
 927             }
 928           continue;
 929         }
 930       if (fragment_last < candidate_vnb->ip.reass.range_first)
 931         {
 932           // this fragment ends before candidate range without any overlap
 933           rc =
 934             ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 935                                                   prev_range_bi, *bi0);
 936           if (IP4_REASS_RC_OK != rc)
 937             {
 938               return rc;
 939             }
 940           consumed = 1;
 941         }
 942       else
 943         {
 944           if (fragment_first >= candidate_vnb->ip.reass.range_first &&
 945               fragment_last <= candidate_vnb->ip.reass.range_last)
 946             {
 947               // this fragment is a (sub)part of existing range, ignore it
 948               if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 949                 {
 950                   ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
 951                                             RANGE_OVERLAP, 0, ~0);
 952                 }
 953               break;
 954             }
 955           int discard_candidate = 0;
 956           if (fragment_first < candidate_vnb->ip.reass.range_first)
 957             {
 958               u32 overlap =
 959                 fragment_last - candidate_vnb->ip.reass.range_first + 1;
 960               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 961                 {
 962                   candidate_vnb->ip.reass.range_first += overlap;
 963                   if (reass->data_len < overlap)
 964                     {
 965                       return IP4_REASS_RC_INTERNAL_ERROR;
 966                     }
 967                   reass->data_len -= overlap;
 968                   if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
 969                     {
 970                       ip4_full_reass_add_trace (vm, node, rm, reass,
 971                                                 candidate_range_bi,
 972                                                 RANGE_SHRINK, 0, ~0);
 973                     }
 974                   rc =
 975                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
 976                                                           prev_range_bi,
 977                                                           *bi0);
 978                   if (IP4_REASS_RC_OK != rc)
 979                     {
 980                       return rc;
 981                     }
 982                   consumed = 1;
 983                 }
 984               else
 985                 {
 986                   discard_candidate = 1;
 987                 }
 988             }
 989           else if (fragment_last > candidate_vnb->ip.reass.range_last)
 990             {
 991               u32 overlap =
 992                 candidate_vnb->ip.reass.range_last - fragment_first + 1;
 993               if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
 994                 {
 995                   fvnb->ip.reass.range_first += overlap;
 996                   if (~0 != candidate_vnb->ip.reass.next_range_bi)
 997                     {
 998                       prev_range_bi = candidate_range_bi;
 999                       candidate_range_bi =
1000                         candidate_vnb->ip.reass.next_range_bi;
1001                       continue;
1002                     }
1003                   else
1004                     {
1005                       // special case - last range discarded
1006                       rc =
1007                         ip4_full_reass_insert_range_in_chain (vm, rm, rt,
1008                                                               reass,
1009                                                               candidate_range_bi,
1010                                                               *bi0);
1011                       if (IP4_REASS_RC_OK != rc)
1012                         {
1013                           return rc;
1014                         }
1015                       consumed = 1;
1016                     }
1017                 }
1018               else
1019                 {
1020                   discard_candidate = 1;
1021                 }
1022             }
1023           else
1024             {
1025               discard_candidate = 1;
1026             }
1027           if (discard_candidate)
1028             {
1029               u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
1030               // discard candidate range, probe next range
1031               rc =
1032                 ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
1033                                                         prev_range_bi,
1034                                                         candidate_range_bi);
1035               if (IP4_REASS_RC_OK != rc)
1036                 {
1037                   return rc;
1038                 }
1039               if (~0 != next_range_bi)
1040                 {
1041                   candidate_range_bi = next_range_bi;
1042                   continue;
1043                 }
1044               else
1045                 {
1046                   // special case - last range discarded
1047                   rc =
1048                     ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
1049                                                           prev_range_bi,
1050                                                           *bi0);
1051                   if (IP4_REASS_RC_OK != rc)
1052                     {
1053                       return rc;
1054                     }
1055                   consumed = 1;
1056                 }
1057             }
1058         }
1059       break;
1060     }
1061   ++reass->fragments_n;
1062   if (consumed)
1063     {
1064       if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
1065         {
1066           ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
1067                                     ~0);
1068         }
1069     }
1070   if (~0 != reass->last_packet_octet &&
1071       reass->data_len == reass->last_packet_octet + 1)
1072     {
1073       *handoff_thread_idx = reass->sendout_thread_index;
1074       int handoff =
1075         reass->memory_owner_thread_index != reass->sendout_thread_index;
1076       rc =
1077         ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
1078                                  is_custom);
1079       if (IP4_REASS_RC_OK == rc && handoff)
1080         {
1081           rc = IP4_REASS_RC_HANDOFF;
1082         }
1083     }
1084   else
1085     {
1086       if (consumed)
1087         {
1088           *bi0 = ~0;
1089           if (reass->fragments_n > rm->max_reass_len)
1090             {
1091               rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
1092             }
1093         }
1094       else
1095         {
1096           *next0 = IP4_FULL_REASS_NEXT_DROP;
1097           *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
1098         }
1099     }
1100   return rc;
1101 }
1102
1103 always_inline uword
1104 ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
1105                        vlib_frame_t * frame, ip4_full_reass_node_type_t type)
1106 {
1107   u32 *from = vlib_frame_vector_args (frame);
1108   u32 n_left_from, n_left_to_next, *to_next, next_index;
1109   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1110   ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
1111   clib_spinlock_lock (&rt->lock);
1112
1113   n_left_from = frame->n_vectors;
1114   next_index = node->cached_next_index;
1115   while (n_left_from > 0)
1116     {
1117       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
1118
1119       while (n_left_from > 0 && n_left_to_next > 0)
1120         {
1121           u32 bi0;
1122           vlib_buffer_t *b0;
1123           u32 next0;
1124           u32 error0 = IP4_ERROR_NONE;
1125
1126           bi0 = from[0];
1127           b0 = vlib_get_buffer (vm, bi0);
1128
1129           ip4_header_t *ip0 = vlib_buffer_get_current (b0);
1130           if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
1131             {
1132               // this is a whole packet - no fragmentation
1133               if (CUSTOM != type)
1134                 {
1135                   next0 = IP4_FULL_REASS_NEXT_INPUT;
1136                 }
1137               else
1138                 {
1139                   next0 = vnet_buffer (b0)->ip.reass.next_index;
1140                 }
1141               goto packet_enqueue;
1142             }
1143           const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1144           const u32 fragment_length =
1145             clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
1146           const u32 fragment_last = fragment_first + fragment_length - 1;
1147           if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0)))     // 8 is minimum frag length per RFC 791
1148             {
1149               next0 = IP4_FULL_REASS_NEXT_DROP;
1150               error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
1151               goto packet_enqueue;
1152             }
1153           ip4_full_reass_kv_t kv;
1154           u8 do_handoff = 0;
1155
1156           kv.k.as_u64[0] =
1157             (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
1158                            vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
1159             (u64) ip0->src_address.as_u32 << 32;
1160           kv.k.as_u64[1] =
1161             (u64) ip0->dst_address.
1162             as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
1163
1164           ip4_full_reass_t *reass =
1165             ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
1166                                            &do_handoff);
1167
1168           if (reass)
1169             {
1170               const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
1171               if (0 == fragment_first)
1172                 {
1173                   reass->sendout_thread_index = vm->thread_index;
1174                 }
1175             }
1176
1177           if (PREDICT_FALSE (do_handoff))
1178             {
1179               next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1180               vnet_buffer (b0)->ip.reass.owner_thread_index =
1181                 kv.v.memory_owner_thread_index;
1182             }
1183           else if (reass)
1184             {
1185               u32 handoff_thread_idx;
1186               switch (ip4_full_reass_update
1187                       (vm, node, rm, rt, reass, &bi0, &next0,
1188                        &error0, CUSTOM == type, &handoff_thread_idx))
1189                 {
1190                 case IP4_REASS_RC_OK:
1191                   /* nothing to do here */
1192                   break;
1193                 case IP4_REASS_RC_HANDOFF:
1194                   next0 = IP4_FULL_REASS_NEXT_HANDOFF;
1195                   b0 = vlib_get_buffer (vm, bi0);
1196                   vnet_buffer (b0)->ip.reass.owner_thread_index =
1197                     handoff_thread_idx;
1198                   break;
1199                 case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
1200                   vlib_node_increment_counter (vm, node->node_index,
1201                                                IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1202                                                1);
1203                   ip4_full_reass_drop_all (vm, node, rm, reass);
1204                   ip4_full_reass_free (rm, rt, reass);
1205                   goto next_packet;
1206                   break;
1207                 case IP4_REASS_RC_NO_BUF:
1208                   vlib_node_increment_counter (vm, node->node_index,
1209                                                IP4_ERROR_REASS_NO_BUF, 1);
1210                   ip4_full_reass_drop_all (vm, node, rm, reass);
1211                   ip4_full_reass_free (rm, rt, reass);
1212                   goto next_packet;
1213                   break;
1214                 case IP4_REASS_RC_INTERNAL_ERROR:
1215                   /* drop everything and start with a clean slate */
1216                   vlib_node_increment_counter (vm, node->node_index,
1217                                                IP4_ERROR_REASS_INTERNAL_ERROR,
1218                                                1);
1219                   ip4_full_reass_drop_all (vm, node, rm, reass);
1220                   ip4_full_reass_free (rm, rt, reass);
1221                   goto next_packet;
1222                   break;
1223                 }
1224             }
1225           else
1226             {
1227               next0 = IP4_FULL_REASS_NEXT_DROP;
1228               error0 = IP4_ERROR_REASS_LIMIT_REACHED;
1229             }
1230
1231
1232         packet_enqueue:
1233
1234           if (bi0 != ~0)
1235             {
1236               to_next[0] = bi0;
1237               to_next += 1;
1238               n_left_to_next -= 1;
1239
1240               /* bi0 might have been updated by reass_finalize, reload */
1241               b0 = vlib_get_buffer (vm, bi0);
1242               if (IP4_ERROR_NONE != error0)
1243                 {
1244                   b0->error = node->errors[error0];
1245                 }
1246
1247               if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
1248                 {
1249                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
1250                     {
1251                       ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
1252                                                 HANDOFF, 0,
1253                                                 vnet_buffer (b0)->ip.
1254                                                 reass.owner_thread_index);
1255                     }
1256                 }
1257               else if (FEATURE == type && IP4_ERROR_NONE == error0)
1258                 {
1259                   vnet_feature_next (&next0, b0);
1260                 }
1261               vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1262                                                to_next, n_left_to_next,
1263                                                bi0, next0);
1264               IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
1265             }
1266
1267         next_packet:
1268           from += 1;
1269           n_left_from -= 1;
1270         }
1271
1272       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1273     }
1274
1275   clib_spinlock_unlock (&rt->lock);
1276   return frame->n_vectors;
1277 }
1278
1279 static char *ip4_full_reass_error_strings[] = {
1280 #define _(sym, string) string,
1281   foreach_ip4_error
1282 #undef _
1283 };
1284
1285 VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
1286                                     vlib_node_runtime_t * node,
1287                                     vlib_frame_t * frame)
1288 {
1289   return ip4_full_reass_inline (vm, node, frame, NORMAL);
1290 }
1291
1292 /* *INDENT-OFF* */
1293 VLIB_REGISTER_NODE (ip4_full_reass_node) = {
1294     .name = "ip4-full-reassembly",
1295     .vector_size = sizeof (u32),
1296     .format_trace = format_ip4_full_reass_trace,
1297     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1298     .error_strings = ip4_full_reass_error_strings,
1299     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1300     .next_nodes =
1301         {
1302                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1303                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1304                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
1305
1306         },
1307 };
1308 /* *INDENT-ON* */
1309
1310 VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
1311                                             vlib_node_runtime_t * node,
1312                                             vlib_frame_t * frame)
1313 {
1314   return ip4_full_reass_inline (vm, node, frame, FEATURE);
1315 }
1316
1317 /* *INDENT-OFF* */
1318 VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
1319     .name = "ip4-full-reassembly-feature",
1320     .vector_size = sizeof (u32),
1321     .format_trace = format_ip4_full_reass_trace,
1322     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1323     .error_strings = ip4_full_reass_error_strings,
1324     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1325     .next_nodes =
1326         {
1327                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1328                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1329                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
1330         },
1331 };
1332 /* *INDENT-ON* */
1333
1334 /* *INDENT-OFF* */
1335 VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
1336     .arc_name = "ip4-unicast",
1337     .node_name = "ip4-full-reassembly-feature",
1338     .runs_before = VNET_FEATURES ("ip4-lookup",
1339                                   "ipsec4-input-feature"),
1340     .runs_after = 0,
1341 };
1342 /* *INDENT-ON* */
1343
1344 VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
1345                                            vlib_node_runtime_t * node,
1346                                            vlib_frame_t * frame)
1347 {
1348   return ip4_full_reass_inline (vm, node, frame, CUSTOM);
1349 }
1350
1351 /* *INDENT-OFF* */
1352 VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
1353     .name = "ip4-full-reassembly-custom",
1354     .vector_size = sizeof (u32),
1355     .format_trace = format_ip4_full_reass_trace,
1356     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1357     .error_strings = ip4_full_reass_error_strings,
1358     .n_next_nodes = IP4_FULL_REASS_N_NEXT,
1359     .next_nodes =
1360         {
1361                 [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
1362                 [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
1363                 [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
1364         },
1365 };
1366 /* *INDENT-ON* */
1367
1368 /* *INDENT-OFF* */
1369 VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
1370     .arc_name = "ip4-unicast",
1371     .node_name = "ip4-full-reassembly-feature",
1372     .runs_before = VNET_FEATURES ("ip4-lookup",
1373                                   "ipsec4-input-feature"),
1374     .runs_after = 0,
1375 };
1376
1377 /* *INDENT-ON* */
1378
1379 #ifndef CLIB_MARCH_VARIANT
1380 uword
1381 ip4_full_reass_custom_register_next_node (uword node_index)
1382 {
1383   return vlib_node_add_next (vlib_get_main (),
1384                              ip4_full_reass_node_custom.index, node_index);
1385 }
1386
1387 always_inline u32
1388 ip4_full_reass_get_nbuckets ()
1389 {
1390   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1391   u32 nbuckets;
1392   u8 i;
1393
1394   nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
1395
1396   for (i = 0; i < 31; i++)
1397     if ((1 << i) >= nbuckets)
1398       break;
1399   nbuckets = 1 << i;
1400
1401   return nbuckets;
1402 }
1403 #endif /* CLIB_MARCH_VARIANT */
1404
1405 typedef enum
1406 {
1407   IP4_EVENT_CONFIG_CHANGED = 1,
1408 } ip4_full_reass_event_t;
1409
1410 typedef struct
1411 {
1412   int failure;
1413   clib_bihash_16_8_t *new_hash;
1414 } ip4_rehash_cb_ctx;
1415
1416 #ifndef CLIB_MARCH_VARIANT
1417 static int
1418 ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
1419 {
1420   ip4_rehash_cb_ctx *ctx = _ctx;
1421   if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
1422     {
1423       ctx->failure = 1;
1424     }
1425   return (BIHASH_WALK_CONTINUE);
1426 }
1427
1428 static void
1429 ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
1430                            u32 max_reassembly_length,
1431                            u32 expire_walk_interval_ms)
1432 {
1433   ip4_full_reass_main.timeout_ms = timeout_ms;
1434   ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
1435   ip4_full_reass_main.max_reass_n = max_reassemblies;
1436   ip4_full_reass_main.max_reass_len = max_reassembly_length;
1437   ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
1438 }
1439
1440 vnet_api_error_t
1441 ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
1442                     u32 max_reassembly_length, u32 expire_walk_interval_ms)
1443 {
1444   u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
1445   ip4_full_reass_set_params (timeout_ms, max_reassemblies,
1446                              max_reassembly_length, expire_walk_interval_ms);
1447   vlib_process_signal_event (ip4_full_reass_main.vlib_main,
1448                              ip4_full_reass_main.ip4_full_reass_expire_node_idx,
1449                              IP4_EVENT_CONFIG_CHANGED, 0);
1450   u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
1451   if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
1452     {
1453       clib_bihash_16_8_t new_hash;
1454       clib_memset (&new_hash, 0, sizeof (new_hash));
1455       ip4_rehash_cb_ctx ctx;
1456       ctx.failure = 0;
1457       ctx.new_hash = &new_hash;
1458       clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
1459                              new_nbuckets * 1024);
1460       clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
1461                                                ip4_rehash_cb, &ctx);
1462       if (ctx.failure)
1463         {
1464           clib_bihash_free_16_8 (&new_hash);
1465           return -1;
1466         }
1467       else
1468         {
1469           clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
1470           clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
1471                             sizeof (ip4_full_reass_main.hash));
1472           clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
1473         }
1474     }
1475   return 0;
1476 }
1477
1478 vnet_api_error_t
1479 ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
1480                     u32 * max_reassembly_length,
1481                     u32 * expire_walk_interval_ms)
1482 {
1483   *timeout_ms = ip4_full_reass_main.timeout_ms;
1484   *max_reassemblies = ip4_full_reass_main.max_reass_n;
1485   *max_reassembly_length = ip4_full_reass_main.max_reass_len;
1486   *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
1487   return 0;
1488 }
1489
1490 static clib_error_t *
1491 ip4_full_reass_init_function (vlib_main_t * vm)
1492 {
1493   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1494   clib_error_t *error = 0;
1495   u32 nbuckets;
1496   vlib_node_t *node;
1497
1498   rm->vlib_main = vm;
1499
1500   vec_validate (rm->per_thread_data, vlib_num_workers ());
1501   ip4_full_reass_per_thread_t *rt;
1502   vec_foreach (rt, rm->per_thread_data)
1503   {
1504     clib_spinlock_init (&rt->lock);
1505     pool_alloc (rt->pool, rm->max_reass_n);
1506   }
1507
1508   node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
1509   ASSERT (node);
1510   rm->ip4_full_reass_expire_node_idx = node->index;
1511
1512   ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
1513                              IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
1514                              IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
1515                              IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
1516
1517   nbuckets = ip4_full_reass_get_nbuckets ();
1518   clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
1519
1520   node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
1521   ASSERT (node);
1522   rm->ip4_drop_idx = node->index;
1523
1524   rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
1525   rm->fq_feature_index =
1526     vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
1527   rm->fq_custom_index =
1528     vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
1529
1530   rm->feature_use_refcount_per_intf = NULL;
1531   return error;
1532 }
1533
1534 VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
1535 #endif /* CLIB_MARCH_VARIANT */
1536
1537 static uword
1538 ip4_full_reass_walk_expired (vlib_main_t * vm,
1539                              vlib_node_runtime_t * node, vlib_frame_t * f)
1540 {
1541   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1542   uword event_type, *event_data = 0;
1543
1544   while (true)
1545     {
1546       vlib_process_wait_for_event_or_clock (vm,
1547                                             (f64)
1548                                             rm->expire_walk_interval_ms /
1549                                             (f64) MSEC_PER_SEC);
1550       event_type = vlib_process_get_events (vm, &event_data);
1551
1552       switch (event_type)
1553         {
1554         case ~0:                /* no events => timeout */
1555           /* nothing to do here */
1556           break;
1557         case IP4_EVENT_CONFIG_CHANGED:
1558           break;
1559         default:
1560           clib_warning ("BUG: event type 0x%wx", event_type);
1561           break;
1562         }
1563       f64 now = vlib_time_now (vm);
1564
1565       ip4_full_reass_t *reass;
1566       int *pool_indexes_to_free = NULL;
1567
1568       uword thread_index = 0;
1569       int index;
1570       const uword nthreads = vlib_num_workers () + 1;
1571       for (thread_index = 0; thread_index < nthreads; ++thread_index)
1572         {
1573           ip4_full_reass_per_thread_t *rt =
1574             &rm->per_thread_data[thread_index];
1575           clib_spinlock_lock (&rt->lock);
1576
1577           vec_reset_length (pool_indexes_to_free);
1578           /* *INDENT-OFF* */
1579           pool_foreach_index (index, rt->pool)  {
1580                                 reass = pool_elt_at_index (rt->pool, index);
1581                                 if (now > reass->last_heard + rm->timeout)
1582                                   {
1583                                     vec_add1 (pool_indexes_to_free, index);
1584                                   }
1585                               }
1586           /* *INDENT-ON* */
1587           int *i;
1588           /* *INDENT-OFF* */
1589           vec_foreach (i, pool_indexes_to_free)
1590           {
1591             ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
1592             ip4_full_reass_drop_all (vm, node, rm, reass);
1593             ip4_full_reass_free (rm, rt, reass);
1594           }
1595           /* *INDENT-ON* */
1596
1597           clib_spinlock_unlock (&rt->lock);
1598         }
1599
1600       vec_free (pool_indexes_to_free);
1601       if (event_data)
1602         {
1603           _vec_len (event_data) = 0;
1604         }
1605     }
1606
1607   return 0;
1608 }
1609
1610 /* *INDENT-OFF* */
1611 VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
1612     .function = ip4_full_reass_walk_expired,
1613     .type = VLIB_NODE_TYPE_PROCESS,
1614     .name = "ip4-full-reassembly-expire-walk",
1615     .format_trace = format_ip4_full_reass_trace,
1616     .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
1617     .error_strings = ip4_full_reass_error_strings,
1618
1619 };
1620 /* *INDENT-ON* */
1621
1622 static u8 *
1623 format_ip4_full_reass_key (u8 * s, va_list * args)
1624 {
1625   ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
1626   s =
1627     format (s,
1628             "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
1629             key->xx_id, format_ip4_address, &key->src, format_ip4_address,
1630             &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
1631   return s;
1632 }
1633
1634 static u8 *
1635 format_ip4_reass (u8 * s, va_list * args)
1636 {
1637   vlib_main_t *vm = va_arg (*args, vlib_main_t *);
1638   ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
1639
1640   s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
1641               "last_packet_octet: %u, trace_op_counter: %u\n",
1642               reass->id, format_ip4_full_reass_key, &reass->key,
1643               reass->first_bi, reass->data_len,
1644               reass->last_packet_octet, reass->trace_op_counter);
1645
1646   u32 bi = reass->first_bi;
1647   u32 counter = 0;
1648   while (~0 != bi)
1649     {
1650       vlib_buffer_t *b = vlib_get_buffer (vm, bi);
1651       vnet_buffer_opaque_t *vnb = vnet_buffer (b);
1652       s =
1653         format (s,
1654                 "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
1655                 "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
1656                 vnb->ip.reass.range_last, bi,
1657                 ip4_full_reass_buffer_get_data_offset (b),
1658                 ip4_full_reass_buffer_get_data_len (b),
1659                 vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
1660       if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
1661         {
1662           bi = b->next_buffer;
1663         }
1664       else
1665         {
1666           bi = ~0;
1667         }
1668     }
1669   return s;
1670 }
1671
1672 static clib_error_t *
1673 show_ip4_reass (vlib_main_t * vm,
1674                 unformat_input_t * input,
1675                 CLIB_UNUSED (vlib_cli_command_t * lmd))
1676 {
1677   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1678
1679   vlib_cli_output (vm, "---------------------");
1680   vlib_cli_output (vm, "IP4 reassembly status");
1681   vlib_cli_output (vm, "---------------------");
1682   bool details = false;
1683   if (unformat (input, "details"))
1684     {
1685       details = true;
1686     }
1687
1688   u32 sum_reass_n = 0;
1689   ip4_full_reass_t *reass;
1690   uword thread_index;
1691   const uword nthreads = vlib_num_workers () + 1;
1692   for (thread_index = 0; thread_index < nthreads; ++thread_index)
1693     {
1694       ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
1695       clib_spinlock_lock (&rt->lock);
1696       if (details)
1697         {
1698           /* *INDENT-OFF* */
1699           pool_foreach (reass, rt->pool) {
1700             vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
1701           }
1702           /* *INDENT-ON* */
1703         }
1704       sum_reass_n += rt->reass_n;
1705       clib_spinlock_unlock (&rt->lock);
1706     }
1707   vlib_cli_output (vm, "---------------------");
1708   vlib_cli_output (vm, "Current full IP4 reassemblies count: %lu\n",
1709                    (long unsigned) sum_reass_n);
1710   vlib_cli_output (vm,
1711                    "Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
1712                    (long unsigned) rm->max_reass_n);
1713   vlib_cli_output (vm,
1714                    "Maximum configured full IP4 reassembly timeout: %lums\n",
1715                    (long unsigned) rm->timeout_ms);
1716   vlib_cli_output (vm,
1717                    "Maximum configured full IP4 reassembly expire walk interval: %lums\n",
1718                    (long unsigned) rm->expire_walk_interval_ms);
1719   return 0;
1720 }
1721
1722 /* *INDENT-OFF* */
1723 VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
1724     .path = "show ip4-full-reassembly",
1725     .short_help = "show ip4-full-reassembly [details]",
1726     .function = show_ip4_reass,
1727 };
1728 /* *INDENT-ON* */
1729
1730 #ifndef CLIB_MARCH_VARIANT
1731 vnet_api_error_t
1732 ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
1733 {
1734   return vnet_feature_enable_disable ("ip4-unicast",
1735                                       "ip4-full-reassembly-feature",
1736                                       sw_if_index, enable_disable, 0, 0);
1737 }
1738 #endif /* CLIB_MARCH_VARIANT */
1739
1740
1741 #define foreach_ip4_full_reass_handoff_error                       \
1742 _(CONGESTION_DROP, "congestion drop")
1743
1744
1745 typedef enum
1746 {
1747 #define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
1748   foreach_ip4_full_reass_handoff_error
1749 #undef _
1750     IP4_FULL_REASS_HANDOFF_N_ERROR,
1751 } ip4_full_reass_handoff_error_t;
1752
1753 static char *ip4_full_reass_handoff_error_strings[] = {
1754 #define _(sym,string) string,
1755   foreach_ip4_full_reass_handoff_error
1756 #undef _
1757 };
1758
1759 typedef struct
1760 {
1761   u32 next_worker_index;
1762 } ip4_full_reass_handoff_trace_t;
1763
1764 static u8 *
1765 format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
1766 {
1767   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1768   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1769   ip4_full_reass_handoff_trace_t *t =
1770     va_arg (*args, ip4_full_reass_handoff_trace_t *);
1771
1772   s =
1773     format (s, "ip4-full-reassembly-handoff: next-worker %d",
1774             t->next_worker_index);
1775
1776   return s;
1777 }
1778
1779 always_inline uword
1780 ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
1781                                     vlib_node_runtime_t * node,
1782                                     vlib_frame_t * frame,
1783                                     ip4_full_reass_node_type_t type)
1784 {
1785   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1786
1787   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
1788   u32 n_enq, n_left_from, *from;
1789   u16 thread_indices[VLIB_FRAME_SIZE], *ti;
1790   u32 fq_index;
1791
1792   from = vlib_frame_vector_args (frame);
1793   n_left_from = frame->n_vectors;
1794   vlib_get_buffers (vm, from, bufs, n_left_from);
1795
1796   b = bufs;
1797   ti = thread_indices;
1798
1799   switch (type)
1800     {
1801     case NORMAL:
1802       fq_index = rm->fq_index;
1803       break;
1804     case FEATURE:
1805       fq_index = rm->fq_feature_index;
1806       break;
1807     case CUSTOM:
1808       fq_index = rm->fq_custom_index;
1809       break;
1810     default:
1811       clib_warning ("Unexpected `type' (%d)!", type);
1812       ASSERT (0);
1813     }
1814
1815   while (n_left_from > 0)
1816     {
1817       ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
1818
1819       if (PREDICT_FALSE
1820           ((node->flags & VLIB_NODE_FLAG_TRACE)
1821            && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
1822         {
1823           ip4_full_reass_handoff_trace_t *t =
1824             vlib_add_trace (vm, node, b[0], sizeof (*t));
1825           t->next_worker_index = ti[0];
1826         }
1827
1828       n_left_from -= 1;
1829       ti += 1;
1830       b += 1;
1831     }
1832   n_enq =
1833     vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
1834                                    frame->n_vectors, 1);
1835
1836   if (n_enq < frame->n_vectors)
1837     vlib_node_increment_counter (vm, node->node_index,
1838                                  IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
1839                                  frame->n_vectors - n_enq);
1840   return frame->n_vectors;
1841 }
1842
1843 VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
1844                                             vlib_node_runtime_t * node,
1845                                             vlib_frame_t * frame)
1846 {
1847   return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
1848 }
1849
1850
1851 /* *INDENT-OFF* */
1852 VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
1853   .name = "ip4-full-reassembly-handoff",
1854   .vector_size = sizeof (u32),
1855   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1856   .error_strings = ip4_full_reass_handoff_error_strings,
1857   .format_trace = format_ip4_full_reass_handoff_trace,
1858
1859   .n_next_nodes = 1,
1860
1861   .next_nodes = {
1862     [0] = "error-drop",
1863   },
1864 };
1865 /* *INDENT-ON* */
1866
1867
1868 /* *INDENT-OFF* */
1869 VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
1870                                                     vlib_node_runtime_t *
1871                                                     node,
1872                                                     vlib_frame_t * frame)
1873 {
1874   return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
1875 }
1876 /* *INDENT-ON* */
1877
1878
1879 /* *INDENT-OFF* */
1880 VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
1881   .name = "ip4-full-reass-feature-hoff",
1882   .vector_size = sizeof (u32),
1883   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1884   .error_strings = ip4_full_reass_handoff_error_strings,
1885   .format_trace = format_ip4_full_reass_handoff_trace,
1886
1887   .n_next_nodes = 1,
1888
1889   .next_nodes = {
1890     [0] = "error-drop",
1891   },
1892 };
1893 /* *INDENT-ON* */
1894
1895 /* *INDENT-OFF* */
1896 VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
1897                                                     vlib_node_runtime_t *
1898                                                     node,
1899                                                     vlib_frame_t * frame)
1900 {
1901   return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
1902 }
1903 /* *INDENT-ON* */
1904
1905
1906 /* *INDENT-OFF* */
1907 VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
1908   .name = "ip4-full-reass-custom-hoff",
1909   .vector_size = sizeof (u32),
1910   .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
1911   .error_strings = ip4_full_reass_handoff_error_strings,
1912   .format_trace = format_ip4_full_reass_handoff_trace,
1913
1914   .n_next_nodes = 1,
1915
1916   .next_nodes = {
1917     [0] = "error-drop",
1918   },
1919 };
1920 /* *INDENT-ON* */
1921
1922 #ifndef CLIB_MARCH_VARIANT
1923 int
1924 ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
1925 {
1926   ip4_full_reass_main_t *rm = &ip4_full_reass_main;
1927   vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
1928   if (is_enable)
1929     {
1930       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1931         {
1932           ++rm->feature_use_refcount_per_intf[sw_if_index];
1933           return vnet_feature_enable_disable ("ip4-unicast",
1934                                               "ip4-full-reassembly-feature",
1935                                               sw_if_index, 1, 0, 0);
1936         }
1937       ++rm->feature_use_refcount_per_intf[sw_if_index];
1938     }
1939   else
1940     {
1941       --rm->feature_use_refcount_per_intf[sw_if_index];
1942       if (!rm->feature_use_refcount_per_intf[sw_if_index])
1943         return vnet_feature_enable_disable ("ip4-unicast",
1944                                             "ip4-full-reassembly-feature",
1945                                             sw_if_index, 0, 0, 0);
1946     }
1947   return -1;
1948 }
1949 #endif
1950
1951 /*
1952  * fd.io coding-style-patch-verification: ON
1953  *
1954  * Local Variables:
1955  * eval: (c-set-style "gnu")
1956  * End:
1957  */