1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* 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 u8
nat44_ed_maximum_sessions_exceeded (snat_main_t * sm,
u32 fib_index, u32 thread_index)
{
u32 translations;
translations = pool_elts (sm->per_thread_data[thread_index].sessions);
if (vec_len (sm->max_translations_per_fib) <= fib_index)
fib_index = 0;
return translations >= sm->max_translations_per_fib[fib_index];
}
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 void
nat44_global_lru_insert (snat_main_per_thread_data_t * tsm,
snat_session_t * s, f64 now)
{
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;
}
static_always_inline void
nat44_sessions_clear ()
{
snat_main_t *sm = &snat_main;
snat_main_per_thread_data_t *tsm;
/* *INDENT-OFF* */
vec_foreach (tsm, sm->per_thread_data)
{
u32 ti;
nat44_db_free (tsm);
nat44_db_init (tsm);
ti = tsm->snat_thread_index;
// clear per thread session counters
vlib_set_simple_counter (&sm->total_users, ti, 0, 0);
vlib_set_simple_counter (&sm->total_sessions, ti, 0, 0);
}
/* *INDENT-ON* */
}
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;
if (sm->deterministic || sm->endpoint_dependent)
return rv;
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:
*/
|
