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