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, value;
 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] = reass->key.as_u64[0];
 277       kv.key[1] = reass->key.as_u64[1];
 278       if (!clib_bihash_search_16_8 (&srm->ip4_reass_hash, &kv, &value))
 279         {
 280           if (value.value == (reass - srm->ip4_reass_pool))
 281             {
 282               if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 0))
 283                 {
 284                   reass = 0;
 285                   goto unlock;
 286                 }
 287             }
 288         }
 289
 290       nat_ip4_reass_get_frags_inline (reass, bi_to_drop);
 291     }
 292   else
 293     {
 294       pool_get (srm->ip4_reass_pool, reass);
 295       pool_get (srm->ip4_reass_lru_list_pool, elt);
 296       reass->lru_list_index = elt_index = elt - srm->ip4_reass_lru_list_pool;
 297       clib_dlist_init (srm->ip4_reass_lru_list_pool, elt_index);
 298       elt->value = reass - srm->ip4_reass_pool;
 299       clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
 300                           srm->ip4_reass_head_index, elt_index);
 301       pool_get (srm->ip4_frags_list_pool, per_reass_list_head_elt);
 302       reass->frags_per_reass_list_head_index =
 303         per_reass_list_head_elt - srm->ip4_frags_list_pool;
 304       clib_dlist_init (srm->ip4_frags_list_pool,
 305                        reass->frags_per_reass_list_head_index);
 306       srm->ip4_reass_n++;
 307     }
 308
 309   reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
 310   reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
 311   kv.value = reass - srm->ip4_reass_pool;
 312   reass->sess_index = (u32) ~ 0;
 313   reass->thread_index = (u32) ~ 0;
 314   reass->last_heard = now;
 315   reass->frag_n = 0;
 316
 317   if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 1))
 318     {
 319       reass = 0;
 320       goto unlock;
 321     }
 322
 323 unlock:
 324   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 325   return reass;
 326 }
 327
 328 int
 329 nat_ip4_reass_add_fragment (nat_reass_ip4_t * reass, u32 bi)
 330 {
 331   nat_reass_main_t *srm = &nat_reass_main;
 332   dlist_elt_t *elt;
 333   u32 elt_index;
 334
 335   if (reass->frag_n >= srm->ip4_max_frag)
 336     {
 337       nat_ipfix_logging_max_fragments_ip4 (srm->ip4_max_frag,
 338                                            &reass->key.src);
 339       return -1;
 340     }
 341
 342   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 343
 344   pool_get (srm->ip4_frags_list_pool, elt);
 345   elt_index = elt - srm->ip4_frags_list_pool;
 346   clib_dlist_init (srm->ip4_frags_list_pool, elt_index);
 347   elt->value = bi;
 348   clib_dlist_addtail (srm->ip4_frags_list_pool,
 349                       reass->frags_per_reass_list_head_index, elt_index);
 350   reass->frag_n++;
 351
 352   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 353
 354   return 0;
 355 }
 356
 357 void
 358 nat_ip4_reass_get_frags (nat_reass_ip4_t * reass, u32 ** bi)
 359 {
 360   nat_reass_main_t *srm = &nat_reass_main;
 361
 362   clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
 363
 364   nat_ip4_reass_get_frags_inline (reass, bi);
 365
 366   clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
 367 }
 368
 369 void
 370 nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx)
 371 {
 372   nat_reass_ip4_t *reass;
 373   nat_reass_main_t *srm = &nat_reass_main;
 374   f64 now = vlib_time_now (srm->vlib_main);
 375
 376   /* *INDENT-OFF* */
 377   pool_foreach (reass, srm->ip4_reass_pool,
 378   ({
 379     if (now < reass->last_heard + (f64) srm->ip4_timeout)
 380       {
 381         if (fn (reass, ctx))
 382           return;
 383       }
 384   }));
 385   /* *INDENT-ON* */
 386 }
 387
 388 static_always_inline nat_reass_ip6_t *
 389 nat_ip6_reass_lookup (nat_reass_ip6_key_t * k, f64 now)
 390 {
 391   nat_reass_main_t *srm = &nat_reass_main;
 392   clib_bihash_kv_48_8_t kv, value;
 393   nat_reass_ip6_t *reass;
 394
 395   k->unused = 0;
 396   kv.key[0] = k->as_u64[0];
 397   kv.key[1] = k->as_u64[1];
 398   kv.key[2] = k->as_u64[2];
 399   kv.key[3] = k->as_u64[3];
 400   kv.key[4] = k->as_u64[4];
 401   kv.key[5] = k->as_u64[5];
 402
 403   if (clib_bihash_search_48_8 (&srm->ip6_reass_hash, &kv, &value))
 404     return 0;
 405
 406   reass = pool_elt_at_index (srm->ip6_reass_pool, value.value);
 407   if (now < reass->last_heard + (f64) srm->ip6_timeout)
 408     return reass;
 409
 410   return 0;
 411 }
 412
 413 nat_reass_ip6_t *
 414 nat_ip6_reass_find_or_create (ip6_address_t src, ip6_address_t dst,
 415                               u32 frag_id, u8 proto, u8 reset_timeout,
 416                               u32 ** bi_to_drop)
 417 {
 418   nat_reass_main_t *srm = &nat_reass_main;
 419   nat_reass_ip6_t *reass = 0;
 420   nat_reass_ip6_key_t k;
 421   f64 now = vlib_time_now (srm->vlib_main);
 422   dlist_elt_t *oldest_elt, *elt;
 423   dlist_elt_t *per_reass_list_head_elt;
 424   u32 oldest_index, elt_index;
 425   clib_bihash_kv_48_8_t kv;
 426
 427   k.src.as_u64[0] = src.as_u64[0];
 428   k.src.as_u64[1] = src.as_u64[1];
 429   k.dst.as_u64[0] = dst.as_u64[0];
 430   k.dst.as_u64[1] = dst.as_u64[1];
 431   k.frag_id = frag_id;
 432   k.proto = proto;
 433   k.unused = 0;
 434
 435   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 436
 437   reass = nat_ip6_reass_lookup (&k, now);
 438   if (reass)
 439     {
 440       if (reset_timeout)
 441         {
 442           reass->last_heard = now;
 443           clib_dlist_remove (srm->ip6_reass_lru_list_pool,
 444                              reass->lru_list_index);
 445           clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 446                               srm->ip6_reass_head_index,
 447                               reass->lru_list_index);
 448         }
 449       goto unlock;
 450     }
 451
 452   if (srm->ip6_reass_n >= srm->ip6_max_reass)
 453     {
 454       oldest_index =
 455         clib_dlist_remove_head (srm->ip6_reass_lru_list_pool,
 456                                 srm->ip6_reass_head_index);
 457       ASSERT (oldest_index != ~0);
 458       oldest_elt =
 459         pool_elt_at_index (srm->ip4_reass_lru_list_pool, oldest_index);
 460       reass = pool_elt_at_index (srm->ip6_reass_pool, oldest_elt->value);
 461       if (now < reass->last_heard + (f64) srm->ip6_timeout)
 462         {
 463           clib_dlist_addhead (srm->ip6_reass_lru_list_pool,
 464                               srm->ip6_reass_head_index, oldest_index);
 465           clib_warning ("no free resassembly slot");
 466           reass = 0;
 467           goto unlock;
 468         }
 469
 470       clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 471                           srm->ip6_reass_head_index, oldest_index);
 472
 473       kv.key[0] = k.as_u64[0];
 474       kv.key[1] = k.as_u64[1];
 475       kv.key[2] = k.as_u64[2];
 476       kv.key[3] = k.as_u64[4];
 477       kv.key[4] = k.as_u64[5];
 478       if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 0))
 479         {
 480           reass = 0;
 481           goto unlock;
 482         }
 483
 484       nat_ip6_reass_get_frags_inline (reass, bi_to_drop);
 485     }
 486   else
 487     {
 488       pool_get (srm->ip6_reass_pool, reass);
 489       pool_get (srm->ip6_reass_lru_list_pool, elt);
 490       reass->lru_list_index = elt_index = elt - srm->ip6_reass_lru_list_pool;
 491       clib_dlist_init (srm->ip6_reass_lru_list_pool, elt_index);
 492       elt->value = reass - srm->ip6_reass_pool;
 493       clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
 494                           srm->ip6_reass_head_index, elt_index);
 495       pool_get (srm->ip6_frags_list_pool, per_reass_list_head_elt);
 496       reass->frags_per_reass_list_head_index =
 497         per_reass_list_head_elt - srm->ip6_frags_list_pool;
 498       clib_dlist_init (srm->ip6_frags_list_pool,
 499                        reass->frags_per_reass_list_head_index);
 500       srm->ip6_reass_n++;
 501     }
 502
 503   reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
 504   reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
 505   reass->key.as_u64[2] = kv.key[2] = k.as_u64[2];
 506   reass->key.as_u64[3] = kv.key[3] = k.as_u64[3];
 507   reass->key.as_u64[4] = kv.key[4] = k.as_u64[4];
 508   reass->key.as_u64[5] = kv.key[5] = k.as_u64[5];
 509   kv.value = reass - srm->ip6_reass_pool;
 510   reass->sess_index = (u32) ~ 0;
 511   reass->last_heard = now;
 512
 513   if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 1))
 514     {
 515       reass = 0;
 516       goto unlock;
 517     }
 518
 519 unlock:
 520   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 521   return reass;
 522 }
 523
 524 int
 525 nat_ip6_reass_add_fragment (nat_reass_ip6_t * reass, u32 bi)
 526 {
 527   nat_reass_main_t *srm = &nat_reass_main;
 528   dlist_elt_t *elt;
 529   u32 elt_index;
 530
 531   if (reass->frag_n >= srm->ip6_max_frag)
 532     {
 533       nat_ipfix_logging_max_fragments_ip6 (srm->ip6_max_frag,
 534                                            &reass->key.src);
 535       return -1;
 536     }
 537
 538   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 539
 540   pool_get (srm->ip6_frags_list_pool, elt);
 541   elt_index = elt - srm->ip6_frags_list_pool;
 542   clib_dlist_init (srm->ip6_frags_list_pool, elt_index);
 543   elt->value = bi;
 544   clib_dlist_addtail (srm->ip6_frags_list_pool,
 545                       reass->frags_per_reass_list_head_index, elt_index);
 546   reass->frag_n++;
 547
 548   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 549
 550   return 0;
 551 }
 552
 553 void
 554 nat_ip6_reass_get_frags (nat_reass_ip6_t * reass, u32 ** bi)
 555 {
 556   nat_reass_main_t *srm = &nat_reass_main;
 557
 558   clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
 559
 560   nat_ip6_reass_get_frags_inline (reass, bi);
 561
 562   clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
 563 }
 564
 565 void
 566 nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx)
 567 {
 568   nat_reass_ip6_t *reass;
 569   nat_reass_main_t *srm = &nat_reass_main;
 570   f64 now = vlib_time_now (srm->vlib_main);
 571
 572   /* *INDENT-OFF* */
 573   pool_foreach (reass, srm->ip6_reass_pool,
 574   ({
 575     if (now < reass->last_heard + (f64) srm->ip4_timeout)
 576       {
 577         if (fn (reass, ctx))
 578           return;
 579       }
 580   }));
 581   /* *INDENT-ON* */
 582 }
 583
 584 clib_error_t *
 585 nat_reass_init (vlib_main_t * vm)
 586 {
 587   nat_reass_main_t *srm = &nat_reass_main;
 588   vlib_thread_main_t *tm = vlib_get_thread_main ();
 589   clib_error_t *error = 0;
 590   dlist_elt_t *head;
 591   u32 nbuckets, head_index;
 592
 593   srm->vlib_main = vm;
 594   srm->vnet_main = vnet_get_main ();
 595
 596   /* IPv4 */
 597   srm->ip4_timeout = NAT_REASS_TIMEOUT_DEFAULT;
 598   srm->ip4_max_reass = NAT_MAX_REASS_DEAFULT;
 599   srm->ip4_max_frag = NAT_MAX_FRAG_DEFAULT;
 600   srm->ip4_drop_frag = 0;
 601   srm->ip4_reass_n = 0;
 602
 603   if (tm->n_vlib_mains > 1)
 604     clib_spinlock_init (&srm->ip4_reass_lock);
 605
 606   pool_alloc (srm->ip4_reass_pool, srm->ip4_max_reass);
 607
 608   nbuckets = nat_reass_get_nbuckets (0);
 609   clib_bihash_init_16_8 (&srm->ip4_reass_hash, "nat-ip4-reass", nbuckets,
 610                          nbuckets * 1024);
 611
 612   pool_get (srm->ip4_reass_lru_list_pool, head);
 613   srm->ip4_reass_head_index = head_index =
 614     head - srm->ip4_reass_lru_list_pool;
 615   clib_dlist_init (srm->ip4_reass_lru_list_pool, head_index);
 616
 617   /* IPv6 */
 618   srm->ip6_timeout = NAT_REASS_TIMEOUT_DEFAULT;
 619   srm->ip6_max_reass = NAT_MAX_REASS_DEAFULT;
 620   srm->ip6_max_frag = NAT_MAX_FRAG_DEFAULT;
 621   srm->ip6_drop_frag = 0;
 622   srm->ip6_reass_n = 0;
 623
 624   if (tm->n_vlib_mains > 1)
 625     clib_spinlock_init (&srm->ip6_reass_lock);
 626
 627   pool_alloc (srm->ip6_reass_pool, srm->ip6_max_reass);
 628
 629   nbuckets = nat_reass_get_nbuckets (1);
 630   clib_bihash_init_48_8 (&srm->ip6_reass_hash, "nat-ip6-reass", nbuckets,
 631                          nbuckets * 1024);
 632
 633   pool_get (srm->ip6_reass_lru_list_pool, head);
 634   srm->ip6_reass_head_index = head_index =
 635     head - srm->ip6_reass_lru_list_pool;
 636   clib_dlist_init (srm->ip6_reass_lru_list_pool, head_index);
 637
 638   return error;
 639 }
 640
 641 static clib_error_t *
 642 nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
 643                       vlib_cli_command_t * cmd)
 644 {
 645   clib_error_t *error = 0;
 646   unformat_input_t _line_input, *line_input = &_line_input;
 647   u32 timeout = 0, max_reass = 0, max_frag = 0;
 648   u8 drop_frag = (u8) ~ 0, is_ip6 = 0;
 649   int rv;
 650
 651   /* Get a line of input. */
 652   if (!unformat_user (input, unformat_line_input, line_input))
 653     return 0;
 654
 655   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
 656     {
 657       if (unformat (line_input, "max-reassemblies %u", &max_reass))
 658         ;
 659       else if (unformat (line_input, "max-fragments %u", &max_frag))
 660         ;
 661       else if (unformat (line_input, "timeout %u", &timeout))
 662         ;
 663       else if (unformat (line_input, "enable"))
 664         drop_frag = 0;
 665       else if (unformat (line_input, "disable"))
 666         drop_frag = 1;
 667       else if (unformat (line_input, "ip4"))
 668         is_ip6 = 0;
 669       else if (unformat (line_input, "ip6"))
 670         is_ip6 = 1;
 671       else
 672         {
 673           error = clib_error_return (0, "unknown input '%U'",
 674                                      format_unformat_error, line_input);
 675           goto done;
 676         }
 677     }
 678
 679   if (!timeout)
 680     timeout = nat_reass_get_timeout (is_ip6);
 681   if (!max_reass)
 682     max_reass = nat_reass_get_max_reass (is_ip6);
 683   if (!max_frag)
 684     max_frag = nat_reass_get_max_frag (is_ip6);
 685   if (drop_frag == (u8) ~ 0)
 686     drop_frag = nat_reass_is_drop_frag (is_ip6);
 687
 688   rv =
 689     nat_reass_set (timeout, (u16) max_reass, (u8) max_frag, drop_frag,
 690                    is_ip6);
 691   if (rv)
 692     {
 693       error = clib_error_return (0, "nat_set_reass return %d", rv);
 694       goto done;
 695     }
 696
 697 done:
 698   unformat_free (line_input);
 699
 700   return error;
 701 }
 702
 703 static int
 704 nat_ip4_reass_walk_cli (nat_reass_ip4_t * reass, void *ctx)
 705 {
 706   vlib_main_t *vm = ctx;
 707
 708   vlib_cli_output (vm, "  src %U dst %U proto %u id 0x%04x cached %u",
 709                    format_ip4_address, &reass->key.src,
 710                    format_ip4_address, &reass->key.dst,
 711                    reass->key.proto,
 712                    clib_net_to_host_u16 (reass->key.frag_id), reass->frag_n);
 713
 714   return 0;
 715 }
 716
 717 static int
 718 nat_ip6_reass_walk_cli (nat_reass_ip6_t * reass, void *ctx)
 719 {
 720   vlib_main_t *vm = ctx;
 721
 722   vlib_cli_output (vm, "  src %U dst %U proto %u id 0x%08x cached %u",
 723                    format_ip6_address, &reass->key.src,
 724                    format_ip6_address, &reass->key.dst,
 725                    reass->key.proto,
 726                    clib_net_to_host_u32 (reass->key.frag_id), reass->frag_n);
 727
 728   return 0;
 729 }
 730
 731 static clib_error_t *
 732 show_nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
 733                            vlib_cli_command_t * cmd)
 734 {
 735   vlib_cli_output (vm, "NAT IPv4 virtual fragmentation reassembly is %s",
 736                    nat_reass_is_drop_frag (0) ? "DISABLED" : "ENABLED");
 737   vlib_cli_output (vm, " max-reassemblies %u", nat_reass_get_max_reass (0));
 738   vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (0));
 739   vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (0));
 740   vlib_cli_output (vm, " reassemblies:");
 741   nat_ip4_reass_walk (nat_ip4_reass_walk_cli, vm);
 742
 743   vlib_cli_output (vm, "NAT IPv6 virtual fragmentation reassembly is %s",
 744                    nat_reass_is_drop_frag (1) ? "DISABLED" : "ENABLED");
 745   vlib_cli_output (vm, " max-reassemblies %u", nat_reass_get_max_reass (1));
 746   vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (1));
 747   vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (1));
 748   vlib_cli_output (vm, " reassemblies:");
 749   nat_ip6_reass_walk (nat_ip6_reass_walk_cli, vm);
 750
 751   return 0;
 752 }
 753
 754 /* *INDENT-OFF* */
 755 VLIB_CLI_COMMAND (nat_reass_command, static) =
 756 {
 757   .path = "nat virtual-reassembly",
 758   .short_help = "nat virtual-reassembly ip4|ip6 [max-reassemblies <n>] "
 759                 "[max-fragments <n>] [timeout <sec>] [enable|disable]",
 760   .function = nat_reass_command_fn,
 761 };
 762
 763 VLIB_CLI_COMMAND (show_nat_reass_command, static) =
 764 {
 765   .path = "show nat virtual-reassembly",
 766   .short_help = "show nat virtual-reassembly",
 767   .function = show_nat_reass_command_fn,
 768 };
 769 /* *INDENT-ON* */
 770
 771 /*
 772  * fd.io coding-style-patch-verification: ON
 773  *
 774  * Local Variables:
 775  * eval: (c-set-style "gnu")
 776  * End:
 777  */