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)
  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 snat_session_t *
  46 nat44_session_reuse_old (snat_main_t * sm, snat_user_t * u,
  47                          snat_session_t * s, u32 thread_index, f64 now)
  48 {
  49   nat44_free_session_data (sm, s, thread_index, 0);
  50   if (snat_is_session_static (s))
  51     u->nstaticsessions--;
  52   else
  53     u->nsessions--;
  54   s->flags = 0;
  55   s->total_bytes = 0;
  56   s->total_pkts = 0;
  57   s->state = 0;
  58   s->ext_host_addr.as_u32 = 0;
  59   s->ext_host_port = 0;
  60   s->ext_host_nat_addr.as_u32 = 0;
  61   s->ext_host_nat_port = 0;
  62   s->tcp_close_timestamp = 0;
  63   s->ha_last_refreshed = now;
  64   return s;
  65 }
  66
  67 static_always_inline void
  68 nat44_global_lru_insert (snat_main_per_thread_data_t * tsm,
  69                          snat_session_t * s, f64 now)
  70 {
  71   dlist_elt_t *lru_list_elt;
  72   pool_get (tsm->global_lru_pool, lru_list_elt);
  73   s->global_lru_index = lru_list_elt - tsm->global_lru_pool;
  74   clib_dlist_addtail (tsm->global_lru_pool, tsm->global_lru_head_index,
  75                       s->global_lru_index);
  76   lru_list_elt->value = s - tsm->sessions;
  77   s->last_lru_update = now;
  78 }
  79
  80 static_always_inline snat_session_t *
  81 nat44_session_alloc_new (snat_main_per_thread_data_t * tsm, snat_user_t * u,
  82                          f64 now)
  83 {
  84   snat_session_t *s;
  85   dlist_elt_t *per_user_translation_list_elt;
  86
  87   pool_get (tsm->sessions, s);
  88   clib_memset (s, 0, sizeof (*s));
  89   /* Create list elts */
  90   pool_get (tsm->list_pool, per_user_translation_list_elt);
  91   clib_dlist_init (tsm->list_pool,
  92                    per_user_translation_list_elt - tsm->list_pool);
  93
  94   per_user_translation_list_elt->value = s - tsm->sessions;
  95   s->per_user_index = per_user_translation_list_elt - tsm->list_pool;
  96   s->per_user_list_head_index = u->sessions_per_user_list_head_index;
  97
  98   clib_dlist_addtail (tsm->list_pool,
  99                       s->per_user_list_head_index,
 100                       per_user_translation_list_elt - tsm->list_pool);
 101
 102   nat44_global_lru_insert (tsm, s, now);
 103   s->ha_last_refreshed = now;
 104   return s;
 105 }
 106
 107 static_always_inline void
 108 nat44_user_del_sessions (snat_user_t * u, u32 thread_index)
 109 {
 110   dlist_elt_t *elt;
 111   snat_session_t *s;
 112
 113   snat_main_t *sm = &snat_main;
 114   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 115
 116   // get head
 117   elt = pool_elt_at_index (tsm->list_pool,
 118                            u->sessions_per_user_list_head_index);
 119   // get first element
 120   elt = pool_elt_at_index (tsm->list_pool, elt->next);
 121
 122   while (elt->value != ~0)
 123     {
 124       s = pool_elt_at_index (tsm->sessions, elt->value);
 125       elt = pool_elt_at_index (tsm->list_pool, elt->next);
 126
 127       nat44_free_session_data (sm, s, thread_index, 0);
 128       nat44_delete_session (sm, s, thread_index);
 129     }
 130 }
 131
 132 static_always_inline int
 133 nat44_user_del (ip4_address_t * addr, u32 fib_index)
 134 {
 135   int rv = 1;
 136
 137   snat_main_t *sm = &snat_main;
 138   snat_main_per_thread_data_t *tsm;
 139
 140   snat_user_key_t user_key;
 141   clib_bihash_kv_8_8_t kv, value;
 142
 143   user_key.addr.as_u32 = addr->as_u32;
 144   user_key.fib_index = fib_index;
 145   kv.key = user_key.as_u64;
 146
 147   if (sm->num_workers > 1)
 148     {
 149       /* *INDENT-OFF* */
 150       vec_foreach (tsm, sm->per_thread_data)
 151         {
 152           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 153             {
 154               nat44_user_del_sessions (
 155                   pool_elt_at_index (tsm->users, value.value),
 156                   tsm->thread_index);
 157               rv = 0;
 158               break;
 159             }
 160         }
 161       /* *INDENT-ON* */
 162     }
 163   else
 164     {
 165       tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 166       if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 167         {
 168           nat44_user_del_sessions (pool_elt_at_index
 169                                    (tsm->users, value.value),
 170                                    tsm->thread_index);
 171           rv = 0;
 172         }
 173     }
 174   return rv;
 175 }
 176
 177 #endif /* included_nat44_inlines_h__ */
 178
 179 /*
 180  * fd.io coding-style-patch-verification: ON
 181  *
 182  * Local Variables:
 183  * eval: (c-set-style "gnu")
 184  * End:
 185  */