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
|
/*
* plugin.h: plugin handling
*
* Copyright (c) 2011 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_plugin_h__
#define __included_plugin_h__
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/*
* vlib plugin scheme
*
* Almost anything which can be made to work in a vlib unix
* application will also work in a vlib plugin.
*
* The elf-section magic which registers static objects
* works so long as plugins are preset when the vlib unix process
* starts. But wait: there's more...
*
* If an application calls vlib_load_new_plugins() -- possibly after
* changing vlib_plugin_main.plugin_path / vlib_plugin_main.plugin_name_filter,
* -- new plugins will be loaded. That, in turn, allows considerable
* flexibility in terms of adding feature code or fixing bugs without
* requiring the data-plane process to restart.
*
* When the plugin mechanism loads a plugin, it uses dlsym to locate
* and call the plugin's function vlib_plugin_register() if it exists.
* A plugin which expects to be loaded after the vlib application
* starts uses this callback to modify the application. If vlib_plugin_register
* returns non-zero, the plugin mechanism dlclose()'s the plugin.
*
* Applications control the plugin search path and name filter by
* declaring the variables vlib_plugin_path and vlib_plugin_name_filter.
* libvlib.la supplies weak references for these symbols which
* effectively disable the scheme. In order for the elf-section magic to
* work, static plugins must be loaded at the earliest possible moment.
*
* An application can change these parameters at any time and call
* vlib_load_new_plugins().
*/
/* *INDENT-OFF* */
typedef CLIB_PACKED(struct {
u8 default_disabled;
const char version[32];
const char version_required[32];
const char overrides[256];
const char *early_init;
const char *description;
}) vlib_plugin_registration_t;
/* *INDENT-ON* */
typedef struct
{
u8 *name;
u8 *filename;
struct stat file_info;
void *handle;
/* plugin registration */
vlib_plugin_registration_t *reg;
char *version;
} plugin_info_t;
typedef struct
{
char *name;
u8 is_disabled;
u8 is_enabled;
u8 skip_version_check;
} plugin_config_t;
typedef struct
{
/* loaded plugin info */
plugin_info_t *plugin_info;
uword *plugin_by_name_hash;
uword *plugin_overrides_by_name_hash;
/* paths and name filters */
u8 *plugin_path;
u8 *plugin_name_filter;
u8 *vat_plugin_path;
u8 *vat_plugin_name_filter;
u8 plugins_default_disable;
/* plugin configs and hash by name */
plugin_config_t *configs;
uword *config_index_by_name;
/* Plugin log, avoid filling syslog w/ junk */
vlib_log_class_t logger;
/* usual */
vlib_main_t *vlib_main;
} plugin_main_t;
extern plugin_main_t vlib_plugin_main;
clib_error_t *vlib_plugin_config (vlib_main_t * vm, unformat_input_t * input);
int vlib_plugin_early_init (vlib_main_t * vm);
int vlib_load_new_plugins (plugin_main_t * pm, int from_early_init);
void *vlib_get_plugin_symbol (char *plugin_name, char *symbol_name);
u8 *vlib_get_vat_plugin_path (void);
#define VLIB_PLUGIN_REGISTER() \
vlib_plugin_registration_t vlib_plugin_registration \
CLIB_NOSANITIZE_PLUGIN_REG_SECTION \
__attribute__((__section__(".vlib_plugin_registration")))
/* Call a plugin init function: used for init function dependencies. */
#define vlib_call_plugin_init_function(vm,p,x) \
({ \
clib_error_t *(*_f)(vlib_main_t *); \
uword *_fptr = 0; \
clib_error_t * _error = 0; \
_fptr= vlib_get_plugin_symbol \
(p, CLIB_STRING_MACRO(_vlib_init_function_##x)); \
if (_fptr == 0) \
{ \
_error = clib_error_return \
(0, "Plugin %s and/or symbol %s not found.", \
p, CLIB_STRING_MACRO(_vlib_init_function_##x)); \
} \
else \
{ \
_f = (void *)(_fptr[0]); \
} \
if (_fptr && ! hash_get (vm->init_functions_called, _f)) \
{ \
hash_set1 (vm->init_functions_called, _f); \
_error = _f (vm); \
} \
_error; \
})
#endif /* __included_plugin_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
