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
|
/*
* Copyright (c) 2018 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.
*/
/**
* @file
* @brief NAT plugin client-IP based session affinity for load-balancing
*/
#ifndef __included_nat44_ed_affinity_h__
#define __included_nat44_ed_affinity_h__
#include <vnet/ip/ip.h>
#include <vppinfra/bihash_16_8.h>
#include <vppinfra/dlist.h>
typedef struct
{
union
{
struct
{
ip4_address_t service_addr;
ip4_address_t client_addr;
/* align by making this 4 octets even though its a 1 octet field */
u32 proto;
/* align by making this 4 octets even though its a 2 octets field */
u32 service_port;
};
u64 as_u64[2];
};
} nat_affinity_key_t;
typedef CLIB_PACKED(struct
{
nat_affinity_key_t key;
u32 sticky_time;
u32 ref_cnt;
u32 per_service_index;
u8 backend_index;
f64 expire;
}) nat_affinity_t;
typedef struct
{
nat_affinity_t *affinity_pool;
clib_bihash_16_8_t affinity_hash;
clib_spinlock_t affinity_lock;
dlist_elt_t *list_pool;
vlib_main_t *vlib_main;
} nat_affinity_main_t;
extern nat_affinity_main_t nat_affinity_main;
/**
* @brief Get new affinity per service list head index.
*
* @returns new affinity per service list head index.
*/
u32 nat_affinity_get_per_service_list_head_index (void);
/**
* @brief Flush all service affinity data.
*
* @param affinity_per_service_list_head_index Per sevice list head index.
*/
void nat_affinity_flush_service (u32 affinity_per_service_list_head_index);
/**
* @brief NAT affinity enable
*/
void nat_affinity_enable ();
/**
* @brief NAT affinity disable
*/
void nat_affinity_disable ();
/**
* @brief Initialize NAT client-IP based affinity.
*
* @param vm vlib main.
*
* @return error code.
*/
clib_error_t *nat_affinity_init (vlib_main_t * vm);
/**
* @brief Find service backend index for client-IP and take a reference
* counting lock.
*
* @param client_addr Client IP address.
* @param service_addr Service IP address.
* @param proto IP protocol number.
* @param service_port Service L4 port number.
* @param backend_index Service backend index for client-IP if found.
*
* @return 0 on success, non-zero value otherwise.
*/
int nat_affinity_find_and_lock (vlib_main_t *vm, ip4_address_t client_addr,
ip4_address_t service_addr, u8 proto,
u16 service_port, u8 *backend_index);
/**
* @brief Create affinity record and take reference counting lock.
* @param client_addr Client IP address.
* @param service_addr Service IP address.
* @param proto IP protocol number.
* @param service_port Service L4 port number.
* @param backend_index Service backend index for client-IP.
* @param sticky_time Affinity sticky time in seconds.
* @param affinity_per_service_list_head_index Per sevice list head index.
*
* @return 0 on success, non-zero value otherwise.
*/
int nat_affinity_create_and_lock (ip4_address_t client_addr,
ip4_address_t service_addr, u8 proto,
u16 service_port, u8 backend_index,
u32 sticky_time,
u32 affinity_per_service_list_head_index);
/**
* @brief Release a reference counting lock for affinity.
*
* @param client_addr Client IP address.
* @param service_addr Service IP address.
* @param proto IP protocol number.
*/
void nat_affinity_unlock (ip4_address_t client_addr,
ip4_address_t service_addr, u8 proto,
u16 service_port);
#endif /* __included_nat44_ed_affinity_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
