src/plugins/nat/nat44/inlines.h

   1 /*
   2  * Copyright (c) 2020 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  * @brief The NAT44 inline functions
  17  */
  18
  19 #ifndef included_nat44_inlines_h__
  20 #define included_nat44_inlines_h__
  21
  22 #include <vnet/fib/ip4_fib.h>
  23 #include <nat/nat.h>
  24
  25 static_always_inline u8
  26 nat44_maximum_sessions_exceeded (snat_main_t * sm, u32 thread_index)
  27 {
  28   if (pool_elts (sm->per_thread_data[thread_index].sessions) >=
  29       sm->max_translations_per_thread)
  30     return 1;
  31   return 0;
  32 }
  33
  34 static_always_inline u8
  35 nat44_ed_maximum_sessions_exceeded (snat_main_t * sm,
  36                                     u32 fib_index, u32 thread_index)
  37 {
  38   u32 translations;
  39   translations = pool_elts (sm->per_thread_data[thread_index].sessions);
  40   if (vec_len (sm->max_translations_per_fib) <= fib_index)
  41     fib_index = 0;
  42   return translations >= sm->max_translations_per_fib[fib_index];
  43 }
  44
  45 static_always_inline void
  46 nat44_user_del_sessions (snat_user_t * u, u32 thread_index)
  47 {
  48   dlist_elt_t *elt;
  49   snat_session_t *s;
  50
  51   snat_main_t *sm = &snat_main;
  52   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
  53
  54   // get head
  55   elt = pool_elt_at_index (tsm->list_pool,
  56                            u->sessions_per_user_list_head_index);
  57   // get first element
  58   elt = pool_elt_at_index (tsm->list_pool, elt->next);
  59
  60   while (elt->value != ~0)
  61     {
  62       s = pool_elt_at_index (tsm->sessions, elt->value);
  63       elt = pool_elt_at_index (tsm->list_pool, elt->next);
  64
  65       nat44_free_session_data (sm, s, thread_index, 0);
  66       nat44_delete_session (sm, s, thread_index);
  67     }
  68 }
  69
  70 static_always_inline int
  71 nat44_user_del (ip4_address_t * addr, u32 fib_index)
  72 {
  73   int rv = 1;
  74
  75   snat_main_t *sm = &snat_main;
  76   snat_main_per_thread_data_t *tsm;
  77
  78   snat_user_key_t user_key;
  79   clib_bihash_kv_8_8_t kv, value;
  80
  81   if (sm->endpoint_dependent)
  82     return rv;
  83
  84   user_key.addr.as_u32 = addr->as_u32;
  85   user_key.fib_index = fib_index;
  86   kv.key = user_key.as_u64;
  87
  88   if (sm->num_workers > 1)
  89     {
  90       /* *INDENT-OFF* */
  91       vec_foreach (tsm, sm->per_thread_data)
  92         {
  93           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
  94             {
  95               nat44_user_del_sessions (
  96                   pool_elt_at_index (tsm->users, value.value),
  97                   tsm->thread_index);
  98               rv = 0;
  99               break;
 100             }
 101         }
 102       /* *INDENT-ON* */
 103     }
 104   else
 105     {
 106       tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 107       if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 108         {
 109           nat44_user_del_sessions (pool_elt_at_index
 110                                    (tsm->users, value.value),
 111                                    tsm->thread_index);
 112           rv = 0;
 113         }
 114     }
 115   return rv;
 116 }
 117
 118 #endif /* included_nat44_inlines_h__ */
 119
 120 /*
 121  * fd.io coding-style-patch-verification: ON
 122  *
 123  * Local Variables:
 124  * eval: (c-set-style "gnu")
 125  * End:
 126  */