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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 void
nat44_session_cleanup (snat_session_t * s, u32 thread_index)
{
snat_main_t *sm = &snat_main;
nat_free_session_data (sm, s, thread_index, 0);
nat44_delete_session (sm, s, thread_index);
}
static_always_inline void
nat44_user_try_cleanup (snat_user_t * u, u32 thread_index, f64 now)
{
dlist_elt_t *elt;
snat_session_t *s;
u64 sess_timeout_time;
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);
sess_timeout_time = s->last_heard +
(f64) nat44_session_get_timeout (sm, s);
if (now < sess_timeout_time)
{
tsm->min_session_timeout =
clib_min (sess_timeout_time, tsm->min_session_timeout);
continue;
}
nat44_session_cleanup (s, thread_index);
}
}
static_always_inline void
nat44_session_try_cleanup (ip4_address_t * addr,
u32 fib_index, u32 thread_index, f64 now)
{
snat_user_t *u = 0;
snat_user_key_t user_key;
clib_bihash_kv_8_8_t kv, value;
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
user_key.addr.as_u32 = addr->as_u32;
user_key.fib_index = fib_index;
kv.key = user_key.as_u64;
// lookup user for this traffic
if (PREDICT_FALSE (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)))
{
// there is still place and a new user can be created
if (PREDICT_TRUE (pool_elts (tsm->sessions) < sm->max_translations))
return;
if (now >= tsm->min_session_timeout)
{
tsm->min_session_timeout = ~0;
// there is no place so we try to cleanup all users in this thread
/* *INDENT-OFF* */
pool_foreach (u, tsm->users,
({ nat44_user_try_cleanup (u, thread_index, now); }));
/* *INDENT-ON* */
if (~0 == tsm->min_session_timeout)
{
tsm->min_session_timeout = 0;
}
}
return;
}
if (now >= tsm->min_session_timeout)
{
tsm->min_session_timeout = ~0;
// each time user creates a new session we try to cleanup expired sessions
nat44_user_try_cleanup (pool_elt_at_index (tsm->users, value.value),
thread_index, now);
if (~0 == tsm->min_session_timeout)
{
tsm->min_session_timeout = 0;
}
}
}
static_always_inline void
nat44_force_session_cleanup (void)
{
snat_user_t *u = 0;
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm;
vlib_main_t *vm = vlib_get_main ();
f64 now = vlib_time_now (vm);
// TODO: consider own timeouts
if (sm->num_workers > 1)
{
/* *INDENT-OFF* */
vec_foreach (tsm, sm->per_thread_data)
{
pool_foreach (u, tsm->users,
({
nat44_user_try_cleanup (u, tsm->thread_index, now);
}));
}
/* *INDENT-ON* */
}
else
{
tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
/* *INDENT-OFF* */
pool_foreach (u, tsm->users,
({
nat44_user_try_cleanup (u, tsm->thread_index, now);
}));
/* *INDENT-ON* */
}
}
#endif /* included_nat44_inlines_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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