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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/*
* swlib.h: Switch configuration API (user space part)
*
* Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
Usage of the library functions:
The main datastructure for a switch is the struct switch_device
To get started, you first need to use switch_connect() to probe
for switches and allocate an instance of this struct.
There are two possible usage modes:
dev = switch_connect("eth0");
- this call will look for a switch registered for the linux device
"eth0" and only allocate a switch_device for this particular switch.
dev = switch_connect(NULL)
- this will return one switch_device struct for each available
switch. The switch_device structs are chained with by ->next pointer
Then to query a switch for all available attributes, use:
swlib_scan(dev);
All allocated datastructures for the switch_device struct can be freed with
swlib_free(dev);
or
swlib_free_all(dev);
The latter traverses a whole chain of switch_device structs and frees them all
Switch attributes (struct switch_attr) are divided into three groups:
dev->ops:
- global settings
dev->port_ops:
- per-port settings
dev->vlan_ops:
- per-vlan settings
switch_lookup_attr() is a small helper function to locate attributes
by name.
switch_set_attr() and switch_get_attr() can alter or request the values
of attributes.
Usage of the switch_attr struct:
->atype: attribute group, one of:
- SWLIB_ATTR_GROUP_GLOBAL
- SWLIB_ATTR_GROUP_VLAN
- SWLIB_ATTR_GROUP_PORT
->id: identifier for the attribute
->type: data type, one of:
- SWITCH_TYPE_INT
- SWITCH_TYPE_STRING
- SWITCH_TYPE_PORT
->name: short name of the attribute
->description: longer description
->next: pointer to the next attribute of the current group
Usage of the switch_val struct:
When setting attributes, following members of the struct switch_val need
to be set up:
->len (for attr->type == SWITCH_TYPE_PORT)
->port_vlan:
- port number (for attr->atype == SWLIB_ATTR_GROUP_PORT), or:
- vlan number (for attr->atype == SWLIB_ATTR_GROUP_VLAN)
->value.i (for attr->type == SWITCH_TYPE_INT)
->value.s (for attr->type == SWITCH_TYPE_STRING)
- owned by the caller, not stored in the library internally
->value.ports (for attr->type == SWITCH_TYPE_PORT)
- must point to an array of at lest val->len * sizeof(struct switch_port)
When getting string attributes, val->value.s must be freed by the caller
When getting port list attributes, an internal static buffer is used,
which changes from call to call.
*/
#ifndef __SWLIB_H
#define __SWLIB_H
enum swlib_attr_group {
SWLIB_ATTR_GROUP_GLOBAL,
SWLIB_ATTR_GROUP_VLAN,
SWLIB_ATTR_GROUP_PORT,
};
enum swlib_port_flags {
SWLIB_PORT_FLAG_TAGGED = (1 << 0),
};
struct switch_dev;
struct switch_attr;
struct switch_port;
struct switch_port_map;
struct switch_val;
struct uci_package;
struct switch_dev {
int id;
char dev_name[IFNAMSIZ];
char *name;
char *alias;
int ports;
int vlans;
int cpu_port;
struct switch_attr *ops;
struct switch_attr *port_ops;
struct switch_attr *vlan_ops;
struct switch_portmap *maps;
struct switch_dev *next;
void *priv;
};
struct switch_val {
struct switch_attr *attr;
int len;
int err;
int port_vlan;
union {
char *s;
int i;
struct switch_port *ports;
} value;
};
struct switch_attr {
struct switch_dev *dev;
int atype;
int id;
int type;
const char *name;
const char *description;
struct switch_attr *next;
};
struct switch_port {
unsigned int id;
unsigned int flags;
};
struct switch_portmap {
unsigned int virt;
const char *segment;
};
/**
* swlib_list: list all switches
*/
void swlib_list(void);
/**
* swlib_print_portmap: get portmap
* @dev: switch device struct
*/
void swlib_print_portmap(struct switch_dev *dev, char *segment);
/**
* swlib_connect: connect to the switch through netlink
* @name: name of the ethernet interface,
*
* if name is NULL, it connect and builds a chain of all switches
*/
struct switch_dev *swlib_connect(const char *name);
/**
* swlib_free: free all dynamically allocated data for the switch connection
* @dev: switch device struct
*
* all members of a switch device chain (generated by swlib_connect(NULL))
* must be freed individually
*/
void swlib_free(struct switch_dev *dev);
/**
* swlib_free_all: run swlib_free on all devices in the chain
* @dev: switch device struct
*/
void swlib_free_all(struct switch_dev *dev);
/**
* swlib_scan: probe the switch driver for available commands/attributes
* @dev: switch device struct
*/
int swlib_scan(struct switch_dev *dev);
/**
* swlib_lookup_attr: look up a switch attribute
* @dev: switch device struct
* @type: global, port or vlan
* @name: name of the attribute
*/
struct switch_attr *swlib_lookup_attr(struct switch_dev *dev,
enum swlib_attr_group atype, const char *name);
/**
* swlib_set_attr: set the value for an attribute
* @dev: switch device struct
* @attr: switch attribute struct
* @val: attribute value pointer
* returns 0 on success
*/
int swlib_set_attr(struct switch_dev *dev, struct switch_attr *attr,
struct switch_val *val);
/**
* swlib_set_attr_string: set the value for an attribute with type conversion
* @dev: switch device struct
* @attr: switch attribute struct
* @port_vlan: port or vlan (if applicable)
* @str: string value
* returns 0 on success
*/
int swlib_set_attr_string(struct switch_dev *dev, struct switch_attr *attr,
int port_vlan, const char *str);
/**
* swlib_get_attr: get the value for an attribute
* @dev: switch device struct
* @attr: switch attribute struct
* @val: attribute value pointer
* returns 0 on success
* for string attributes, the result string must be freed by the caller
*/
int swlib_get_attr(struct switch_dev *dev, struct switch_attr *attr,
struct switch_val *val);
/**
* swlib_apply_from_uci: set up the switch from a uci configuration
* @dev: switch device struct
* @p: uci package which contains the desired global config
*/
int swlib_apply_from_uci(struct switch_dev *dev, struct uci_package *p);
#endif
|
