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/*
* simple nat plugin
*
* 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.
*/
#ifndef __included_ed_inlines_h__
#define __included_ed_inlines_h__
#include <float.h>
#include <vppinfra/clib.h>
#include <nat/nat.h>
#include <nat/nat_inlines.h>
static_always_inline int
nat_ed_lru_insert (snat_main_per_thread_data_t * tsm,
snat_session_t * s, f64 now, u8 proto)
{
dlist_elt_t *lru_list_elt;
pool_get (tsm->lru_pool, lru_list_elt);
s->lru_index = lru_list_elt - tsm->lru_pool;
switch (proto)
{
case IP_PROTOCOL_UDP:
s->lru_head_index = tsm->udp_lru_head_index;
break;
case IP_PROTOCOL_TCP:
s->lru_head_index = tsm->tcp_trans_lru_head_index;
break;
case IP_PROTOCOL_ICMP:
s->lru_head_index = tsm->icmp_lru_head_index;
break;
default:
s->lru_head_index = tsm->unk_proto_lru_head_index;
break;
}
clib_dlist_addtail (tsm->lru_pool, s->lru_head_index, s->lru_index);
lru_list_elt->value = s - tsm->sessions;
s->last_lru_update = now;
return 1;
}
always_inline void
nat_ed_session_delete (snat_main_t * sm, snat_session_t * ses,
u32 thread_index, int lru_delete
/* delete from global LRU list */ )
{
snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
thread_index);
if (lru_delete)
{
clib_dlist_remove (tsm->lru_pool, ses->lru_index);
}
pool_put_index (tsm->lru_pool, ses->lru_index);
pool_put (tsm->sessions, ses);
vlib_set_simple_counter (&sm->total_sessions, thread_index, 0,
pool_elts (tsm->sessions));
}
static_always_inline int
nat_lru_free_one_with_head (snat_main_t * sm, int thread_index,
f64 now, u32 head_index)
{
snat_session_t *s = NULL;
dlist_elt_t *oldest_elt;
f64 sess_timeout_time;
u32 oldest_index;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
oldest_index = clib_dlist_remove_head (tsm->lru_pool, head_index);
if (~0 != oldest_index)
{
oldest_elt = pool_elt_at_index (tsm->lru_pool, oldest_index);
s = pool_elt_at_index (tsm->sessions, oldest_elt->value);
sess_timeout_time =
s->last_heard + (f64) nat44_session_get_timeout (sm, s);
if (now >= sess_timeout_time
|| (s->tcp_closed_timestamp && now >= s->tcp_closed_timestamp))
{
nat_free_session_data (sm, s, thread_index, 0);
nat_ed_session_delete (sm, s, thread_index, 0);
return 1;
}
else
{
clib_dlist_addhead (tsm->lru_pool, head_index, oldest_index);
}
}
return 0;
}
static_always_inline int
nat_lru_free_one (snat_main_t * sm, int thread_index, f64 now)
{
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
int rc = 0;
#define _(p) \
if ((rc = nat_lru_free_one_with_head (sm, thread_index, now, \
tsm->p##_lru_head_index))) \
{ \
return rc; \
}
_(tcp_trans);
_(udp);
_(unk_proto);
_(icmp);
_(tcp_estab);
#undef _
return 0;
}
static_always_inline snat_session_t *
nat_ed_session_alloc (snat_main_t * sm, u32 thread_index, f64 now, u8 proto)
{
snat_session_t *s;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
nat_lru_free_one (sm, thread_index, now);
pool_get (tsm->sessions, s);
clib_memset (s, 0, sizeof (*s));
nat_ed_lru_insert (tsm, s, now, proto);
s->ha_last_refreshed = now;
vlib_set_simple_counter (&sm->total_sessions, thread_index, 0,
pool_elts (tsm->sessions));
return s;
}
// slow path
static_always_inline void
per_vrf_sessions_cleanup (u32 thread_index)
{
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm =
vec_elt_at_index (sm->per_thread_data, thread_index);
per_vrf_sessions_t *per_vrf_sessions;
u32 *to_free = 0, *i;
vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
{
if (per_vrf_sessions->expired)
{
if (per_vrf_sessions->ses_count == 0)
{
vec_add1 (to_free, per_vrf_sessions - tsm->per_vrf_sessions_vec);
}
}
}
if (vec_len (to_free))
{
vec_foreach (i, to_free)
{
vec_del1 (tsm->per_vrf_sessions_vec, *i);
}
}
vec_free (to_free);
}
// slow path
static_always_inline void
per_vrf_sessions_register_session (snat_session_t * s, u32 thread_index)
{
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm =
vec_elt_at_index (sm->per_thread_data, thread_index);
per_vrf_sessions_t *per_vrf_sessions;
per_vrf_sessions_cleanup (thread_index);
// s->per_vrf_sessions_index == ~0 ... reuse of old session
vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec)
{
// ignore already expired registrations
if (per_vrf_sessions->expired)
continue;
if ((s->in2out.fib_index == per_vrf_sessions->rx_fib_index) &&
(s->out2in.fib_index == per_vrf_sessions->tx_fib_index))
{
goto done;
}
if ((s->in2out.fib_index == per_vrf_sessions->tx_fib_index) &&
(s->out2in.fib_index == per_vrf_sessions->rx_fib_index))
{
goto done;
}
}
// create a new registration
vec_add2 (tsm->per_vrf_sessions_vec, per_vrf_sessions, 1);
clib_memset (per_vrf_sessions, 0, sizeof (*per_vrf_sessions));
per_vrf_sessions->rx_fib_index = s->in2out.fib_index;
per_vrf_sessions->tx_fib_index = s->out2in.fib_index;
done:
s->per_vrf_sessions_index = per_vrf_sessions - tsm->per_vrf_sessions_vec;
per_vrf_sessions->ses_count++;
}
// fast path
static_always_inline void
per_vrf_sessions_unregister_session (snat_session_t * s, u32 thread_index)
{
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm;
per_vrf_sessions_t *per_vrf_sessions;
ASSERT (s->per_vrf_sessions_index != ~0);
tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
per_vrf_sessions = vec_elt_at_index (tsm->per_vrf_sessions_vec,
s->per_vrf_sessions_index);
ASSERT (per_vrf_sessions->ses_count != 0);
per_vrf_sessions->ses_count--;
s->per_vrf_sessions_index = ~0;
}
// fast path
static_always_inline u8
per_vrf_sessions_is_expired (snat_session_t * s, u32 thread_index)
{
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm;
per_vrf_sessions_t *per_vrf_sessions;
ASSERT (s->per_vrf_sessions_index != ~0);
tsm = vec_elt_at_index (sm->per_thread_data, thread_index);
per_vrf_sessions = vec_elt_at_index (tsm->per_vrf_sessions_vec,
s->per_vrf_sessions_index);
return per_vrf_sessions->expired;
}
#endif
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