src/plugins/nat/nat_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  * @file
  17  * @brief NAT plugin virtual fragmentation reassembly
  18  */
  19
  20 #include <vnet/vnet.h>
  21 #include <nat/nat_reass.h>
  22 #include <nat/nat_ipfix_logging.h>
  23
  24 nat_reass_main_t nat_reass_main;
  25
  26 static u32
  27 nat_reass_get_nbuckets (u8 is_ip6)
  28 {
  29   nat_reass_main_t *srm = &nat_reass_main;
  30   u32 nbuckets;
  31   u8 i;
  32
  33   if (is_ip6)
  34     nbuckets = (u32) (srm->ip6_max_reass / NAT_REASS_HT_LOAD_FACTOR);
  35   else
  36     nbuckets = (u32) (srm->ip4_max_reass / NAT_REASS_HT_LOAD_FACTOR);
  37
  38   for (i = 0; i < 31; i++)
  39     if ((1 << i) >= nbuckets)
  40       break;
  41   nbuckets = 1 << i;
  42
  43   return nbuckets;
  44 }
  45
  46 static_always_inline void
  47 nat_ip4_reass_get_frags_inline (nat_reass_ip4_t * reass, u32 ** bi)
  48 {
  49   nat_reass_main_t *srm = &nat_reass_main;
  50   u32 elt_index;
  51   dlist_elt_t *elt;
  52
  53   while ((elt_index =
  54           clib_dlist_remove_head (srm->ip4_frags_list_pool,
  55                                   reass->frags_per_reass_list_head_index)) !=
  56          ~0)
  57     {
  58       elt = pool_elt_at_index (srm->ip4_frags_list_pool, elt_index);
  59       vec_add1 (*bi, elt->value);
  60       reass->frag_n--;
  61       pool_put_index (srm->ip4_frags_list_pool, elt_index);
  62     }
  63 }
  64
  65 static_always_inline void
  66 nat_ip6_reass_get_frags_inline (nat_reass_ip6_t * reass, u32 ** bi)
  67 {
  68   nat_reass_main_t *srm = &nat_reass_main;
  69   u32 elt_index;
  70   dlist_elt_t *elt;
  71
  72   while ((elt_index =
  73           clib_dlist_remove_head (srm->ip6_frags_list_pool,
  74                                   reass->frags_per_reass_list_head_index)) !=
  75          ~0)
  76     {
  77       elt = pool_elt_at_index (srm->ip6_frags_list_pool, elt_index);
  78       vec_add1 (*bi, elt->value);
  79       reass->frag_n--;
  80       pool_put_index (srm->ip6_frags_list_pool, elt_index);
  81     }
  82 }
  83
  84 int
  85 nat_reass_set (u32 timeout, u16 max_reass, u8 max_frag, u8 drop_frag,
  86                u8 is_ip6)
  87 {
  88   nat_reass_main_t *srm = &nat_reass_main;
  89   u32 nbuckets;
  90
  91   if (is_ip6)
  92     {
  93       if (srm->ip6_max_reass != max_reass)
  94         {
  95           clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
  96
  97           srm->ip6_max_reass = max_reass;
  98           pool_free (srm->ip6_reass_pool);
  99           pool_alloc (srm->ip6_reass_pool, srm->ip4_max_reass);
 100           nbuckets = nat_reass_get_nbuckets (0);
 101           clib_bihash_free_48_8 (&srm->ip6_reass_hash);
 102           clib_bihash_init_48_8 (&srm->ip6_reass_hash, "nat-ip6-reass",
 103                                  nbuckets, nbuckets * 1024);
 104
 105           clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 106         }
 107       srm->ip6_timeout = timeout;
 108       srm->ip6_max_frag = max_frag;
 109       srm->ip6_drop_frag = drop_frag;
 110     }
 111   else
 112     {
 113       if (srm->ip4_max_reass != max_reass)
 114         {
 115           clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 116
 117           srm->ip4_max_reass = max_reass;
 118           pool_free (srm->ip4_reass_pool);
 119           pool_alloc (srm->ip4_reass_pool, srm->ip4_max_reass);
 120           nbuckets = nat_reass_get_nbuckets (0);
 121           clib_bihash_free_16_8 (&srm->ip4_reass_hash);
 122           clib_bihash_init_16_8 (&srm->ip4_reass_hash, "nat-ip4-reass",
 123                                  nbuckets, nbuckets * 1024);
 124           clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 125         }
 126       srm->ip4_timeout = timeout;
 127       srm->ip4_max_frag = max_frag;
 128       srm->ip4_drop_frag = drop_frag;
 129     }
 130
 131   return 0;
 132 }
 133
 134 u32
 135 nat_reass_get_timeout (u8 is_ip6)
 136 {
 137   nat_reass_main_t *srm = &nat_reass_main;
 138
 139   if (is_ip6)
 140     return srm->ip6_timeout;
 141
 142   return srm->ip4_timeout;
 143 }
 144
 145 u16
 146 nat_reass_get_max_reass (u8 is_ip6)
 147 {
 148   nat_reass_main_t *srm = &nat_reass_main;
 149
 150   if (is_ip6)
 151     return srm->ip6_max_reass;
 152
 153   return srm->ip4_max_reass;
 154 }
 155
 156 u8
 157 nat_reass_get_max_frag (u8 is_ip6)
 158 {
 159   nat_reass_main_t *srm = &nat_reass_main;
 160
 161   if (is_ip6)
 162     return srm->ip6_max_frag;
 163
 164   return srm->ip4_max_frag;
 165 }
 166
 167 u8
 168 nat_reass_is_drop_frag (u8 is_ip6)
 169 {
 170   nat_reass_main_t *srm = &nat_reass_main;
 171
 172   if (is_ip6)
 173     return srm->ip6_drop_frag;
 174
 175   return srm->ip4_drop_frag;
 176 }
 177
 178 static_always_inline nat_reass_ip4_t *
 179 nat_ip4_reass_lookup (nat_reass_ip4_key_t * k, f64 now)
 180 {
 181   nat_reass_main_t *srm = &nat_reass_main;
 182   clib_bihash_kv_16_8_t kv, value;
 183   nat_reass_ip4_t *reass;
 184
 185   kv.key[0] = k->as_u64[0];
 186   kv.key[1] = k->as_u64[1];
 187
 188   if (clib_bihash_search_16_8 (&srm->ip4_reass_hash, &kv, &value))
 189     return 0;
 190
 191   reass = pool_elt_at_index (srm->ip4_reass_pool, value.value);
 192   if (now < reass->last_heard + (f64) srm->ip4_timeout)
 193     return reass;
 194
 195   return 0;
 196 }
 197
 198 nat_reass_ip4_t *
 199 nat_ip4_reass_find (ip4_address_t src, ip4_address_t dst, u16 frag_id,
 200                     u8 proto)
 201 {
 202   nat_reass_main_t *srm = &nat_reass_main;
 203   nat_reass_ip4_t *reass = 0;
 204   nat_reass_ip4_key_t k;
 205   f64 now = vlib_time_now (srm->vlib_main);
 206
 207   k.src.as_u32 = src.as_u32;
 208   k.dst.as_u32 = dst.as_u32;
 209   k.frag_id = frag_id;
 210   k.proto = proto;
 211
 212   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 213   reass = nat_ip4_reass_lookup (&k, now);
 214   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 215
 216   return reass;
 217 }
 218
 219 nat_reass_ip4_t *
 220 nat_ip4_reass_find_or_create (ip4_address_t src, ip4_address_t dst,
 221                               u16 frag_id, u8 proto, u8 reset_timeout,
 222                               u32 ** bi_to_drop)
 223 {
 224   nat_reass_main_t *srm = &nat_reass_main;
 225   nat_reass_ip4_t *reass = 0;
 226   nat_reass_ip4_key_t k;
 227   f64 now = vlib_time_now (srm->vlib_main);
 228   dlist_elt_t *oldest_elt, *elt;
 229   dlist_elt_t *per_reass_list_head_elt;
 230   u32 oldest_index, elt_index;
 231   clib_bihash_kv_16_8_t kv;
 232
 233   k.src.as_u32 = src.as_u32;
 234   k.dst.as_u32 = dst.as_u32;
 235   k.frag_id = frag_id;
 236   k.proto = proto;
 237
 238   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 239
 240   reass = nat_ip4_reass_lookup (&k, now);
 241   if (reass)
 242     {
 243       if (reset_timeout)
 244         {
 245           reass->last_heard = now;
 246           clib_dlist_remove (srm->ip4_reass_lru_list_pool,
 247                              reass->lru_list_index);
 248           clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
 249                               srm->ip4_reass_head_index,
 250                               reass->lru_list_index);
 251         }
 252       goto unlock;
 253     }
 254
 255   if (srm->ip4_reass_n >= srm->ip4_max_reass)
 256     {
 257       oldest_index =
 258         clib_dlist_remove_head (srm->ip4_reass_lru_list_pool,
 259                                 srm->ip4_reass_head_index);
 260       ASSERT (oldest_index != ~0);
 261       oldest_elt =
 262         pool_elt_at_index (srm->ip4_reass_lru_list_pool, oldest_index);
 263       reass = pool_elt_at_index (srm->ip4_reass_pool, oldest_elt->value);
 264       if (now < reass->last_heard + (f64) srm->ip4_timeout)
 265         {
 266           clib_dlist_addhead (srm->ip4_reass_lru_list_pool,
 267                               srm->ip4_reass_head_index, oldest_index);
 268           clib_warning ("no free resassembly slot");
 269           reass = 0;
 270           goto unlock;
 271         }
 272
 273       clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
 274                           srm->ip4_reass_head_index, oldest_index);
 275
 276       kv.key[0] = k.as_u64[0];
 277       kv.key[1] = k.as_u64[1];
 278       if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 0))
 279         {
 280           reass = 0;
 281           goto unlock;
 282         }
 283
 284       nat_ip4_reass_get_frags_inline (reass, bi_to_drop);
 285     }
 286   else
 287     {
 288       pool_get (srm->ip4_reass_pool, reass);
 289       pool_get (srm->ip4_reass_lru_list_pool, elt);
 290       reass->lru_list_index = elt_index = elt - srm->ip4_reass_lru_list_pool;
 291       clib_dlist_init (srm->ip4_reass_lru_list_pool, elt_index);
 292       elt->value = reass - srm->ip4_reass_pool;
 293       clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
 294                           srm->ip4_reass_head_index, elt_index);
 295       pool_get (srm->ip4_frags_list_pool, per_reass_list_head_elt);
 296       reass->frags_per_reass_list_head_index =
 297         per_reass_list_head_elt - srm->ip4_frags_list_pool;
 298       clib_dlist_init (srm->ip4_frags_list_pool,
 299                        reass->frags_per_reass_list_head_index);
 300       srm->ip4_reass_n++;
 301     }
 302
 303   reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
 304   reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
 305   kv.value = reass - srm->ip4_reass_pool;
 306   reass->sess_index = (u32) ~ 0;
 307   reass->thread_index = (u32) ~ 0;
 308   reass->last_heard = now;
 309
 310   if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 1))
 311     {
 312       reass = 0;
 313       goto unlock;
 314     }
 315
 316 unlock:
 317   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 318   return reass;
 319 }
 320
 321 int
 322 nat_ip4_reass_add_fragment (nat_reass_ip4_t * reass, u32 bi)
 323 {
 324   nat_reass_main_t *srm = &nat_reass_main;
 325   dlist_elt_t *elt;
 326   u32 elt_index;
 327
 328   if (reass->frag_n >= srm->ip4_max_frag)
 329     {
 330       nat_ipfix_logging_max_fragments_ip4 (srm->ip4_max_frag,
 331                                            &reass->key.src);
 332       return -1;
 333     }
 334
 335   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 336
 337   pool_get (srm->ip4_frags_list_pool, elt);
 338   elt_index = elt - srm->ip4_frags_list_pool;
 339   clib_dlist_init (srm->ip4_frags_list_pool, elt_index);
 340   elt->value = bi;
 341   clib_dlist_addtail (srm->ip4_frags_list_pool,
 342                       reass->frags_per_reass_list_head_index, elt_index);
 343   reass->frag_n++;
 344
 345   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 346
 347   return 0;
 348 }
 349
 350 void
 351 nat_ip4_reass_get_frags (nat_reass_ip4_t * reass, u32 ** bi)
 352 {
 353   nat_reass_main_t *srm = &nat_reass_main;
 354
 355   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 356
 357   nat_ip4_reass_get_frags_inline (reass, bi);
 358
 359   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 360 }
 361
 362 void
 363 nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx)
 364 {
 365   nat_reass_ip4_t *reass;
 366   nat_reass_main_t *srm = &nat_reass_main;
 367   f64 now = vlib_time_now (srm->vlib_main);
 368
 369   /* *INDENT-OFF* */
 370   pool_foreach (reass, srm->ip4_reass_pool,
 371   ({
 372     if (now < reass->last_heard + (f64) srm->ip4_timeout)
 373       {
 374         if (fn (reass, ctx))
 375           return;
 376       }
 377   }));
 378   /* *INDENT-ON* */
 379 }
 380
 381 static_always_inline nat_reass_ip6_t *
 382 nat_ip6_reass_lookup (nat_reass_ip6_key_t * k, f64 now)
 383 {
 384   nat_reass_main_t *srm = &nat_reass_main;
 385   clib_bihash_kv_48_8_t kv, value;
 386   nat_reass_ip6_t *reass;
 387
 388   k->unused = 0;
 389   kv.key[0] = k->as_u64[0];
 390   kv.key[1] = k->as_u64[1];
 391   kv.key[2] = k->as_u64[2];
 392   kv.key[3] = k->as_u64[3];
 393   kv.key[4] = k->as_u64[4];
 394   kv.key[5] = k->as_u64[5];
 395
 396   if (clib_bihash_search_48_8 (&srm->ip6_reass_hash, &kv, &value))
 397     return 0;
 398
 399   reass = pool_elt_at_index (srm->ip6_reass_pool, value.value);
 400   if (now < reass->last_heard + (f64) srm->ip6_timeout)
 401     return reass;
 402
 403   return 0;
 404 }
 405
 406 nat_reass_ip6_t *
 407 nat_ip6_reass_find_or_create (ip6_address_t src, ip6_address_t dst,
 408                               u32 frag_id, u8 proto, u8 reset_timeout,
 409                               u32 ** bi_to_drop)
 410 {
 411   nat_reass_main_t *srm = &nat_reass_main;
 412   nat_reass_ip6_t *reass = 0;
 413   nat_reass_ip6_key_t k;
 414   f64 now = vlib_time_now (srm->vlib_main);
 415   dlist_elt_t *oldest_elt, *elt;
 416   dlist_elt_t *per_reass_list_head_elt;
 417   u32 oldest_index, elt_index;
 418   clib_bihash_kv_48_8_t kv;
 419
 420   k.src.as_u64[0] = src.as_u64[0];
 421   k.src.as_u64[1] = src.as_u64[1];
 422   k.dst.as_u64[0] = dst.as_u64[0];
 423   k.dst.as_u64[1] = dst.as_u64[1];
 424   k.frag_id = frag_id;
 425   k.proto = proto;
 426   k.unused = 0;
 427
 428   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 429
 430   reass = nat_ip6_reass_lookup (&k, now);
 431   if (reass)
 432     {
 433       if (reset_timeout)
 434         {
 435           reass->last_heard = now;
 436           clib_dlist_remove (srm->ip6_reass_lru_list_pool,
 437                              reass->lru_list_index);
 438           clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 439                               srm->ip6_reass_head_index,
 440                               reass->lru_list_index);
 441         }
 442       goto unlock;
 443     }
 444
 445   if (srm->ip6_reass_n >= srm->ip6_max_reass)
 446     {
 447       oldest_index =
 448         clib_dlist_remove_head (srm->ip6_reass_lru_list_pool,
 449                                 srm->ip6_reass_head_index);
 450       ASSERT (oldest_index != ~0);
 451       oldest_elt =
 452         pool_elt_at_index (srm->ip4_reass_lru_list_pool, oldest_index);
 453       reass = pool_elt_at_index (srm->ip6_reass_pool, oldest_elt->value);
 454       if (now < reass->last_heard + (f64) srm->ip6_timeout)
 455         {
 456           clib_dlist_addhead (srm->ip6_reass_lru_list_pool,
 457                               srm->ip6_reass_head_index, oldest_index);
 458           clib_warning ("no free resassembly slot");
 459           reass = 0;
 460           goto unlock;
 461         }
 462
 463       clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 464                           srm->ip6_reass_head_index, oldest_index);
 465
 466       kv.key[0] = k.as_u64[0];
 467       kv.key[1] = k.as_u64[1];
 468       kv.key[2] = k.as_u64[2];
 469       kv.key[3] = k.as_u64[4];
 470       kv.key[4] = k.as_u64[5];
 471       if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 0))
 472         {
 473           reass = 0;
 474           goto unlock;
 475         }
 476
 477       nat_ip6_reass_get_frags_inline (reass, bi_to_drop);
 478     }
 479   else
 480     {
 481       pool_get (srm->ip6_reass_pool, reass);
 482       pool_get (srm->ip6_reass_lru_list_pool, elt);
 483       reass->lru_list_index = elt_index = elt - srm->ip6_reass_lru_list_pool;
 484       clib_dlist_init (srm->ip6_reass_lru_list_pool, elt_index);
 485       elt->value = reass - srm->ip6_reass_pool;
 486       clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 487                           srm->ip6_reass_head_index, elt_index);
 488       pool_get (srm->ip6_frags_list_pool, per_reass_list_head_elt);
 489       reass->frags_per_reass_list_head_index =
 490         per_reass_list_head_elt - srm->ip6_frags_list_pool;
 491       clib_dlist_init (srm->ip6_frags_list_pool,
 492                        reass->frags_per_reass_list_head_index);
 493       srm->ip6_reass_n++;
 494     }
 495
 496   reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
 497   reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
 498   reass->key.as_u64[2] = kv.key[2] = k.as_u64[2];
 499   reass->key.as_u64[3] = kv.key[3] = k.as_u64[3];
 500   reass->key.as_u64[4] = kv.key[4] = k.as_u64[4];
 501   reass->key.as_u64[5] = kv.key[5] = k.as_u64[5];
 502   kv.value = reass - srm->ip6_reass_pool;
 503   reass->sess_index = (u32) ~ 0;
 504   reass->last_heard = now;
 505
 506   if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 1))
 507     {
 508       reass = 0;
 509       goto unlock;
 510     }
 511
 512 unlock:
 513   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 514   return reass;
 515 }
 516
 517 int
 518 nat_ip6_reass_add_fragment (nat_reass_ip6_t * reass, u32 bi)
 519 {
 520   nat_reass_main_t *srm = &nat_reass_main;
 521   dlist_elt_t *elt;
 522   u32 elt_index;
 523
 524   if (reass->frag_n >= srm->ip6_max_frag)
 525     {
 526       nat_ipfix_logging_max_fragments_ip6 (srm->ip6_max_frag,
 527                                            &reass->key.src);
 528       return -1;
 529     }
 530
 531   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 532
 533   pool_get (srm->ip6_frags_list_pool, elt);
 534   elt_index = elt - srm->ip6_frags_list_pool;
 535   clib_dlist_init (srm->ip6_frags_list_pool, elt_index);
 536   elt->value = bi;
 537   clib_dlist_addtail (srm->ip6_frags_list_pool,
 538                       reass->frags_per_reass_list_head_index, elt_index);
 539   reass->frag_n++;
 540
 541   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 542
 543   return 0;
 544 }
 545
 546 void
 547 nat_ip6_reass_get_frags (nat_reass_ip6_t * reass, u32 ** bi)
 548 {
 549   nat_reass_main_t *srm = &nat_reass_main;
 550
 551   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 552
 553   nat_ip6_reass_get_frags_inline (reass, bi);
 554
 555   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 556 }
 557
 558 void
 559 nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx)
 560 {
 561   nat_reass_ip6_t *reass;
 562   nat_reass_main_t *srm = &nat_reass_main;
 563   f64 now = vlib_time_now (srm->vlib_main);
 564
 565   /* *INDENT-OFF* */
 566   pool_foreach (reass, srm->ip6_reass_pool,
 567   ({
 568     if (now < reass->last_heard + (f64) srm->ip4_timeout)
 569       {
 570         if (fn (reass, ctx))
 571           return;
 572       }
 573   }));
 574   /* *INDENT-ON* */
 575 }
 576
 577 clib_error_t *
 578 nat_reass_init (vlib_main_t * vm)
 579 {
 580   nat_reass_main_t *srm = &nat_reass_main;
 581   vlib_thread_main_t *tm = vlib_get_thread_main ();
 582   clib_error_t *error = 0;
 583   dlist_elt_t *head;
 584   u32 nbuckets, head_index;
 585
 586   srm->vlib_main = vm;
 587   srm->vnet_main = vnet_get_main ();
 588
 589   /* IPv4 */
 590   srm->ip4_timeout = NAT_REASS_TIMEOUT_DEFAULT;
 591   srm->ip4_max_reass = NAT_MAX_REASS_DEAFULT;
 592   srm->ip4_max_frag = NAT_MAX_FRAG_DEFAULT;
 593   srm->ip4_drop_frag = 0;
 594   srm->ip4_reass_n = 0;
 595
 596   if (tm->n_vlib_mains > 1)
 597     clib_spinlock_init (&srm->ip4_reass_lock);
 598
 599   pool_alloc (srm->ip4_reass_pool, srm->ip4_max_reass);
 600
 601   nbuckets = nat_reass_get_nbuckets (0);
 602   clib_bihash_init_16_8 (&srm->ip4_reass_hash, "nat-ip4-reass", nbuckets,
 603                          nbuckets * 1024);
 604
 605   pool_get (srm->ip4_reass_lru_list_pool, head);
 606   srm->ip4_reass_head_index = head_index =
 607     head - srm->ip4_reass_lru_list_pool;
 608   clib_dlist_init (srm->ip4_reass_lru_list_pool, head_index);
 609
 610   /* IPv6 */
 611   srm->ip6_timeout = NAT_REASS_TIMEOUT_DEFAULT;
 612   srm->ip6_max_reass = NAT_MAX_REASS_DEAFULT;
 613   srm->ip6_max_frag = NAT_MAX_FRAG_DEFAULT;
 614   srm->ip6_drop_frag = 0;
 615   srm->ip6_reass_n = 0;
 616
 617   if (tm->n_vlib_mains > 1)
 618     clib_spinlock_init (&srm->ip6_reass_lock);
 619
 620   pool_alloc (srm->ip6_reass_pool, srm->ip6_max_reass);
 621
 622   nbuckets = nat_reass_get_nbuckets (1);
 623   clib_bihash_init_48_8 (&srm->ip6_reass_hash, "nat-ip6-reass", nbuckets,
 624                          nbuckets * 1024);
 625
 626   pool_get (srm->ip6_reass_lru_list_pool, head);
 627   srm->ip6_reass_head_index = head_index =
 628     head - srm->ip6_reass_lru_list_pool;
 629   clib_dlist_init (srm->ip6_reass_lru_list_pool, head_index);
 630
 631   return error;
 632 }
 633
 634 static clib_error_t *
 635 nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
 636                       vlib_cli_command_t * cmd)
 637 {
 638   clib_error_t *error = 0;
 639   unformat_input_t _line_input, *line_input = &_line_input;
 640   u32 timeout = 0, max_reass = 0, max_frag = 0;
 641   u8 drop_frag = (u8) ~ 0, is_ip6 = 0;
 642   int rv;
 643
 644   /* Get a line of input. */
 645   if (!unformat_user (input, unformat_line_input, line_input))
 646     return 0;
 647
 648   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
 649     {
 650       if (unformat (line_input, "max-reassemblies %u", &max_reass))
 651         ;
 652       else if (unformat (line_input, "max-fragments %u", &max_frag))
 653         ;
 654       else if (unformat (line_input, "timeout %u", &timeout))
 655         ;
 656       else if (unformat (line_input, "enable"))
 657         drop_frag = 0;
 658       else if (unformat (line_input, "disable"))
 659         drop_frag = 1;
 660       else if (unformat (line_input, "ip4"))
 661         is_ip6 = 0;
 662       else if (unformat (line_input, "ip6"))
 663         is_ip6 = 1;
 664       else
 665         {
 666           error = clib_error_return (0, "unknown input '%U'",
 667                                      format_unformat_error, line_input);
 668           goto done;
 669         }
 670     }
 671
 672   if (!timeout)
 673     timeout = nat_reass_get_timeout (is_ip6);
 674   if (!max_reass)
 675     max_reass = nat_reass_get_max_reass (is_ip6);
 676   if (!max_frag)
 677     max_frag = nat_reass_get_max_frag (is_ip6);
 678   if (drop_frag == (u8) ~ 0)
 679     drop_frag = nat_reass_is_drop_frag (is_ip6);
 680
 681   rv =
 682     nat_reass_set (timeout, (u16) max_reass, (u8) max_frag, drop_frag,
 683                    is_ip6);
 684   if (rv)
 685     {
 686       error = clib_error_return (0, "nat_set_reass return %d", rv);
 687       goto done;
 688     }
 689
 690 done:
 691   unformat_free (line_input);
 692
 693   return error;
 694 }
 695
 696 static int
 697 nat_ip4_reass_walk_cli (nat_reass_ip4_t * reass, void *ctx)
 698 {
 699   vlib_main_t *vm = ctx;
 700
 701   vlib_cli_output (vm, "  src %U dst %U proto %u id 0x%04x cached %u",
 702                    format_ip4_address, &reass->key.src,
 703                    format_ip4_address, &reass->key.dst,
 704                    reass->key.proto,
 705                    clib_net_to_host_u16 (reass->key.frag_id), reass->frag_n);
 706
 707   return 0;
 708 }
 709
 710 static int
 711 nat_ip6_reass_walk_cli (nat_reass_ip6_t * reass, void *ctx)
 712 {
 713   vlib_main_t *vm = ctx;
 714
 715   vlib_cli_output (vm, "  src %U dst %U proto %u id 0x%08x cached %u",
 716                    format_ip6_address, &reass->key.src,
 717                    format_ip6_address, &reass->key.dst,
 718                    reass->key.proto,
 719                    clib_net_to_host_u32 (reass->key.frag_id), reass->frag_n);
 720
 721   return 0;
 722 }
 723
 724 static clib_error_t *
 725 show_nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
 726                            vlib_cli_command_t * cmd)
 727 {
 728   vlib_cli_output (vm, "NAT IPv4 virtual fragmentation reassembly is %s",
 729                    nat_reass_is_drop_frag (0) ? "DISABLED" : "ENABLED");
 730   vlib_cli_output (vm, " max-reassemblies %u", nat_reass_get_max_reass (0));
 731   vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (0));
 732   vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (0));
 733   vlib_cli_output (vm, " reassemblies:");
 734   nat_ip4_reass_walk (nat_ip4_reass_walk_cli, vm);
 735
 736   vlib_cli_output (vm, "NAT IPv6 virtual fragmentation reassembly is %s",
 737                    nat_reass_is_drop_frag (1) ? "DISABLED" : "ENABLED");
 738   vlib_cli_output (vm, " max-reassemblies %u", nat_reass_get_max_reass (1));
 739   vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (1));
 740   vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (1));
 741   vlib_cli_output (vm, " reassemblies:");
 742   nat_ip6_reass_walk (nat_ip6_reass_walk_cli, vm);
 743
 744   return 0;
 745 }
 746
 747 /* *INDENT-OFF* */
 748 VLIB_CLI_COMMAND (nat_reass_command, static) =
 749 {
 750   .path = "nat virtual-reassembly",
 751   .short_help = "nat virtual-reassembly ip4|ip6 [max-reassemblies <n>] "
 752                 "[max-fragments <n>] [timeout <sec>] [enable|disable]",
 753   .function = nat_reass_command_fn,
 754 };
 755
 756 VLIB_CLI_COMMAND (show_nat_reass_command, static) =
 757 {
 758   .path = "show nat virtual-reassembly",
 759   .short_help = "show nat virtual-reassembly",
 760   .function = show_nat_reass_command_fn,
 761 };
 762 /* *INDENT-ON* */
 763
 764 /*
 765  * fd.io coding-style-patch-verification: ON
 766  *
 767  * Local Variables:
 768  * eval: (c-set-style "gnu")
 769  * End:
 770  */