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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @brief The NAT44 inline functions
*/
#ifndef included_nat44_inlines_h__
#define included_nat44_inlines_h__
#include <vnet/fib/ip4_fib.h>
#include <nat/nat.h>
static_always_inline u8
nat44_maximum_sessions_exceeded (snat_main_t * sm, u32 thread_index)
{
if (pool_elts (sm->per_thread_data[thread_index].sessions) >=
sm->max_translations)
return 1;
return 0;
}
static_always_inline snat_session_t *
nat44_session_reuse_old (snat_main_t * sm, snat_user_t * u,
snat_session_t * s, u32 thread_index, f64 now)
{
nat44_free_session_data (sm, s, thread_index, 0);
if (snat_is_session_static (s))
u->nstaticsessions--;
else
u->nsessions--;
s->flags = 0;
s->total_bytes = 0;
s->total_pkts = 0;
s->state = 0;
s->ext_host_addr.as_u32 = 0;
s->ext_host_port = 0;
s->ext_host_nat_addr.as_u32 = 0;
s->ext_host_nat_port = 0;
s->tcp_close_timestamp = 0;
s->ha_last_refreshed = now;
return s;
}
static_always_inline snat_session_t *
nat44_session_alloc_new (snat_main_per_thread_data_t * tsm, snat_user_t * u,
f64 now)
{
snat_session_t *s;
dlist_elt_t *per_user_translation_list_elt;
pool_get (tsm->sessions, s);
clib_memset (s, 0, sizeof (*s));
/* Create list elts */
pool_get (tsm->list_pool, per_user_translation_list_elt);
clib_dlist_init (tsm->list_pool,
per_user_translation_list_elt - tsm->list_pool);
per_user_translation_list_elt->value = s - tsm->sessions;
s->per_user_index = per_user_translation_list_elt - tsm->list_pool;
s->per_user_list_head_index = u->sessions_per_user_list_head_index;
clib_dlist_addtail (tsm->list_pool,
s->per_user_list_head_index,
per_user_translation_list_elt - tsm->list_pool);
dlist_elt_t *lru_list_elt;
pool_get (tsm->global_lru_pool, lru_list_elt);
s->global_lru_index = lru_list_elt - tsm->global_lru_pool;
clib_dlist_addtail (tsm->global_lru_pool, tsm->global_lru_head_index,
s->global_lru_index);
lru_list_elt->value = s - tsm->sessions;
s->last_lru_update = now;
s->ha_last_refreshed = now;
return s;
}
static_always_inline void
nat44_user_del_sessions (snat_user_t * u, u32 thread_index)
{
dlist_elt_t *elt;
snat_session_t *s;
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
// get head
elt = pool_elt_at_index (tsm->list_pool,
u->sessions_per_user_list_head_index);
// get first element
elt = pool_elt_at_index (tsm->list_pool, elt->next);
while (elt->value != ~0)
{
s = pool_elt_at_index (tsm->sessions, elt->value);
elt = pool_elt_at_index (tsm->list_pool, elt->next);
nat44_free_session_data (sm, s, thread_index, 0);
nat44_delete_session (sm, s, thread_index);
}
}
static_always_inline int
nat44_user_del (ip4_address_t * addr, u32 fib_index)
{
int rv = 1;
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm;
snat_user_key_t user_key;
clib_bihash_kv_8_8_t kv, value;
user_key.addr.as_u32 = addr->as_u32;
user_key.fib_index = fib_index;
kv.key = user_key.as_u64;
if (sm->num_workers > 1)
{
/* *INDENT-OFF* */
vec_foreach (tsm, sm->per_thread_data)
{
if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
{
nat44_user_del_sessions (
pool_elt_at_index (tsm->users, value.value),
tsm->thread_index);
rv = 0;
break;
}
}
/* *INDENT-ON* */
}
else
{
tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
{
nat44_user_del_sessions (pool_elt_at_index
(tsm->users, value.value),
tsm->thread_index);
rv = 0;
}
}
return rv;
}
#endif /* included_nat44_inlines_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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