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 snat_session_t *
  35 nat44_session_reuse_old (snat_main_t * sm, snat_user_t * u,
  36                          snat_session_t * s, u32 thread_index, f64 now)
  37 {
  38   nat44_free_session_data (sm, s, thread_index, 0);
  39   if (snat_is_session_static (s))
  40     u->nstaticsessions--;
  41   else
  42     u->nsessions--;
  43   s->flags = 0;
  44   s->total_bytes = 0;
  45   s->total_pkts = 0;
  46   s->state = 0;
  47   s->ext_host_addr.as_u32 = 0;
  48   s->ext_host_port = 0;
  49   s->ext_host_nat_addr.as_u32 = 0;
  50   s->ext_host_nat_port = 0;
  51   s->tcp_close_timestamp = 0;
  52   s->ha_last_refreshed = now;
  53   return s;
  54 }
  55
  56 static_always_inline void
  57 nat44_global_lru_insert (snat_main_per_thread_data_t * tsm,
  58                          snat_session_t * s, f64 now)
  59 {
  60   dlist_elt_t *lru_list_elt;
  61   pool_get (tsm->global_lru_pool, lru_list_elt);
  62   s->global_lru_index = lru_list_elt - tsm->global_lru_pool;
  63   clib_dlist_addtail (tsm->global_lru_pool, tsm->global_lru_head_index,
  64                       s->global_lru_index);
  65   lru_list_elt->value = s - tsm->sessions;
  66   s->last_lru_update = now;
  67 }
  68
  69 static_always_inline snat_session_t *
  70 nat44_session_alloc_new (snat_main_per_thread_data_t * tsm, snat_user_t * u,
  71                          f64 now)
  72 {
  73   snat_session_t *s;
  74   dlist_elt_t *per_user_translation_list_elt;
  75
  76   pool_get (tsm->sessions, s);
  77   clib_memset (s, 0, sizeof (*s));
  78   /* Create list elts */
  79   pool_get (tsm->list_pool, per_user_translation_list_elt);
  80   clib_dlist_init (tsm->list_pool,
  81                    per_user_translation_list_elt - tsm->list_pool);
  82
  83   per_user_translation_list_elt->value = s - tsm->sessions;
  84   s->per_user_index = per_user_translation_list_elt - tsm->list_pool;
  85   s->per_user_list_head_index = u->sessions_per_user_list_head_index;
  86
  87   clib_dlist_addtail (tsm->list_pool,
  88                       s->per_user_list_head_index,
  89                       per_user_translation_list_elt - tsm->list_pool);
  90
  91   nat44_global_lru_insert (tsm, s, now);
  92   s->ha_last_refreshed = now;
  93   return s;
  94 }
  95
  96 static_always_inline void
  97 nat44_user_del_sessions (snat_user_t * u, u32 thread_index)
  98 {
  99   dlist_elt_t *elt;
 100   snat_session_t *s;
 101
 102   snat_main_t *sm = &snat_main;
 103   snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
 104
 105   // get head
 106   elt = pool_elt_at_index (tsm->list_pool,
 107                            u->sessions_per_user_list_head_index);
 108   // get first element
 109   elt = pool_elt_at_index (tsm->list_pool, elt->next);
 110
 111   while (elt->value != ~0)
 112     {
 113       s = pool_elt_at_index (tsm->sessions, elt->value);
 114       elt = pool_elt_at_index (tsm->list_pool, elt->next);
 115
 116       nat44_free_session_data (sm, s, thread_index, 0);
 117       nat44_delete_session (sm, s, thread_index);
 118     }
 119 }
 120
 121 static_always_inline int
 122 nat44_user_del (ip4_address_t * addr, u32 fib_index)
 123 {
 124   int rv = 1;
 125
 126   snat_main_t *sm = &snat_main;
 127   snat_main_per_thread_data_t *tsm;
 128
 129   snat_user_key_t user_key;
 130   clib_bihash_kv_8_8_t kv, value;
 131
 132   user_key.addr.as_u32 = addr->as_u32;
 133   user_key.fib_index = fib_index;
 134   kv.key = user_key.as_u64;
 135
 136   if (sm->num_workers > 1)
 137     {
 138       /* *INDENT-OFF* */
 139       vec_foreach (tsm, sm->per_thread_data)
 140         {
 141           if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 142             {
 143               nat44_user_del_sessions (
 144                   pool_elt_at_index (tsm->users, value.value),
 145                   tsm->thread_index);
 146               rv = 0;
 147               break;
 148             }
 149         }
 150       /* *INDENT-ON* */
 151     }
 152   else
 153     {
 154       tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
 155       if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
 156         {
 157           nat44_user_del_sessions (pool_elt_at_index
 158                                    (tsm->users, value.value),
 159                                    tsm->thread_index);
 160           rv = 0;
 161         }
 162     }
 163   return rv;
 164 }
 165
 166 #endif /* included_nat44_inlines_h__ */
 167
 168 /*
 169  * fd.io coding-style-patch-verification: ON
 170  *
 171  * Local Variables:
 172  * eval: (c-set-style "gnu")
 173  * End:
 174  */