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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/*
* netlink/attr.h Netlink Attributes
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
*/
#ifndef NETLINK_ATTR_H_
#define NETLINK_ATTR_H_
#include <netlink/netlink.h>
#include <netlink/object.h>
#include <netlink/addr.h>
#include <netlink/data.h>
#ifdef __cplusplus
extern "C" {
#endif
struct nl_msg;
/**
* @name Basic Attribute Data Types
* @{
*/
/**
* @ingroup attr
* Basic attribute data types
*
* See \ref attr_datatypes for more details.
*/
enum {
NLA_UNSPEC, /**< Unspecified type, binary data chunk */
NLA_U8, /**< 8 bit integer */
NLA_U16, /**< 16 bit integer */
NLA_U32, /**< 32 bit integer */
NLA_U64, /**< 64 bit integer */
NLA_STRING, /**< NUL terminated character string */
NLA_FLAG, /**< Flag */
NLA_MSECS, /**< Micro seconds (64bit) */
NLA_NESTED, /**< Nested attributes */
__NLA_TYPE_MAX,
};
#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
/** @} */
/**
* @ingroup attr
* Attribute validation policy.
*
* See \ref attr_datatypes for more details.
*/
struct nla_policy {
/** Type of attribute or NLA_UNSPEC */
uint16_t type;
/** Minimal length of payload required */
uint16_t minlen;
/** Maximal length of payload allowed */
uint16_t maxlen;
};
/* Size calculations */
extern int nla_attr_size(int payload);
extern int nla_total_size(int payload);
extern int nla_padlen(int payload);
/* Attribute parsing */
extern int nla_type(const struct nlattr *);
extern void * nla_data(const struct nlattr *);
extern int nla_len(const struct nlattr *);
extern int nla_ok(const struct nlattr *, int);
extern struct nlattr * nla_next(const struct nlattr *, int *);
extern int nla_parse(struct nlattr **, int, struct nlattr *,
int, struct nla_policy *);
extern int nla_validate(struct nlattr *, int, int,
struct nla_policy *);
extern struct nlattr * nla_find(struct nlattr *, int, int);
/* Helper Functions */
extern int nla_memcpy(void *, struct nlattr *, int);
extern size_t nla_strlcpy(char *, const struct nlattr *, size_t);
extern int nla_memcmp(const struct nlattr *, const void *, size_t);
extern int nla_strcmp(const struct nlattr *, const char *);
/* Unspecific attribute */
extern struct nlattr * nla_reserve(struct nl_msg *, int, int);
extern int nla_put(struct nl_msg *, int, int, const void *);
extern int nla_put_data(struct nl_msg *, int, struct nl_data *);
extern int nla_put_addr(struct nl_msg *, int, struct nl_addr *);
/* Integer attribute */
extern uint8_t nla_get_u8(struct nlattr *);
extern int nla_put_u8(struct nl_msg *, int, uint8_t);
extern uint16_t nla_get_u16(struct nlattr *);
extern int nla_put_u16(struct nl_msg *, int, uint16_t);
extern uint32_t nla_get_u32(struct nlattr *);
extern int nla_put_u32(struct nl_msg *, int, uint32_t);
extern uint64_t nla_get_u64(struct nlattr *);
extern int nla_put_u64(struct nl_msg *, int, uint64_t);
/* String attribute */
extern char * nla_get_string(struct nlattr *);
extern char * nla_strdup(struct nlattr *);
extern int nla_put_string(struct nl_msg *, int, const char *);
/* Flag attribute */
extern int nla_get_flag(struct nlattr *);
extern int nla_put_flag(struct nl_msg *, int);
/* Msec attribute */
extern unsigned long nla_get_msecs(struct nlattr *);
extern int nla_put_msecs(struct nl_msg *, int, unsigned long);
/* Attribute nesting */
extern int nla_put_nested(struct nl_msg *, int, struct nl_msg *);
extern struct nlattr * nla_nest_start(struct nl_msg *, int);
extern int nla_nest_end(struct nl_msg *, struct nlattr *);
extern int nla_parse_nested(struct nlattr **, int, struct nlattr *,
struct nla_policy *);
/**
* @name Attribute Construction (Exception Based)
* @{
*/
/**
* @ingroup attr
* Add unspecific attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg attrlen Length of attribute payload.
* @arg data Head of attribute payload.
*/
#define NLA_PUT(msg, attrtype, attrlen, data) \
do { \
if (nla_put(msg, attrtype, attrlen, data) < 0) \
goto nla_put_failure; \
} while(0)
/**
* @ingroup attr
* Add atomic type attribute to netlink message.
* @arg msg Netlink message.
* @arg type Atomic type.
* @arg attrtype Attribute type.
* @arg value Head of attribute payload.
*/
#define NLA_PUT_TYPE(msg, type, attrtype, value) \
do { \
type __tmp = value; \
NLA_PUT(msg, attrtype, sizeof(type), &__tmp); \
} while(0)
/**
* Add 8 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U8(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint8_t, attrtype, value)
/**
* Add 16 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U16(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint16_t, attrtype, value)
/**
* Add 32 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U32(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint32_t, attrtype, value)
/**
* Add 64 bit integer attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value Numeric value.
*/
#define NLA_PUT_U64(msg, attrtype, value) \
NLA_PUT_TYPE(msg, uint64_t, attrtype, value)
/**
* Add string attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg value NUL terminated character string.
*/
#define NLA_PUT_STRING(msg, attrtype, value) \
NLA_PUT(msg, attrtype, strlen(value) + 1, value)
/**
* Add flag attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
*/
#define NLA_PUT_FLAG(msg, attrtype) \
NLA_PUT(msg, attrtype, 0, NULL)
/**
* Add msecs attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg msecs Numeric value in micro seconds.
*/
#define NLA_PUT_MSECS(msg, attrtype, msecs) \
NLA_PUT_U64(msg, attrtype, msecs)
/**
* Add address attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg addr Abstract address object.
*/
#define NLA_PUT_ADDR(msg, attrtype, addr) \
NLA_PUT(msg, attrtype, nl_addr_get_len(addr), \
nl_addr_get_binary_addr(addr))
/**
* Add abstract data attribute to netlink message.
* @arg msg Netlink message.
* @arg attrtype Attribute type.
* @arg data Abstract data object.
*/
#define NLA_PUT_DATA(msg, attrtype, data) \
NLA_PUT(msg, attrtype, nl_data_get_size(data), \
nl_data_get(data))
/** @} */
/**
* @name Iterators
* @{
*/
/**
* @ingroup attr
* Iterate over a stream of attributes
* @arg pos loop counter, set to current attribute
* @arg head head of attribute stream
* @arg len length of attribute stream
* @arg rem initialized to len, holds bytes currently remaining in stream
*/
#define nla_for_each_attr(pos, head, len, rem) \
for (pos = head, rem = len; \
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
/**
* @ingroup attr
* Iterate over a stream of nested attributes
* @arg pos loop counter, set to current attribute
* @arg nla attribute containing the nested attributes
* @arg rem initialized to len, holds bytes currently remaining in stream
*/
#define nla_for_each_nested(pos, nla, rem) \
for (pos = nla_data(nla), rem = nla_len(nla); \
nla_ok(pos, rem); \
pos = nla_next(pos, &(rem)))
/** @} */
#ifdef __cplusplus
}
#endif
#endif
|
