libnftnl 1.2.6
udata.c
1/*
2 * (C) 2012-2016 by Pablo Neira Ayuso <pablo@netfilter.org>
3 * (C) 2016 by Carlos Falgueras GarcĂ­a <carlosfg@riseup.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published
7 * by the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <libnftnl/udata.h>
12#include <udata.h>
13#include <utils.h>
14
15#include <stdlib.h>
16#include <stdint.h>
17#include <string.h>
18
19EXPORT_SYMBOL(nftnl_udata_buf_alloc);
20struct nftnl_udata_buf *nftnl_udata_buf_alloc(uint32_t data_size)
21{
22 struct nftnl_udata_buf *buf;
23
24 buf = malloc(sizeof(struct nftnl_udata_buf) + data_size);
25 if (!buf)
26 return NULL;
27 buf->size = data_size;
28 buf->end = buf->data;
29
30 return buf;
31}
32
33EXPORT_SYMBOL(nftnl_udata_buf_free);
34void nftnl_udata_buf_free(const struct nftnl_udata_buf *buf)
35{
36 xfree(buf);
37}
38
39EXPORT_SYMBOL(nftnl_udata_buf_len);
40uint32_t nftnl_udata_buf_len(const struct nftnl_udata_buf *buf)
41{
42 return (uint32_t)(buf->end - buf->data);
43}
44
45EXPORT_SYMBOL(nftnl_udata_buf_data);
46void *nftnl_udata_buf_data(const struct nftnl_udata_buf *buf)
47{
48 return (void *)buf->data;
49}
50
51EXPORT_SYMBOL(nftnl_udata_buf_put);
52void nftnl_udata_buf_put(struct nftnl_udata_buf *buf, const void *data,
53 uint32_t len)
54{
55 memcpy(buf->data, data, len <= buf->size ? len : buf->size);
56 buf->end = buf->data + len;
57}
58
59EXPORT_SYMBOL(nftnl_udata_start);
60struct nftnl_udata *nftnl_udata_start(const struct nftnl_udata_buf *buf)
61{
62 return (struct nftnl_udata *)buf->data;
63}
64
65EXPORT_SYMBOL(nftnl_udata_end);
66struct nftnl_udata *nftnl_udata_end(const struct nftnl_udata_buf *buf)
67{
68 return (struct nftnl_udata *)buf->end;
69}
70
71EXPORT_SYMBOL(nftnl_udata_put);
72bool nftnl_udata_put(struct nftnl_udata_buf *buf, uint8_t type, uint32_t len,
73 const void *value)
74{
75 struct nftnl_udata *attr;
76
77 if (len > UINT8_MAX || buf->size < len + sizeof(struct nftnl_udata))
78 return false;
79
80 attr = (struct nftnl_udata *)buf->end;
81 attr->len = len;
82 attr->type = type;
83 memcpy(attr->value, value, len);
84
85 buf->end = (char *)nftnl_udata_next(attr);
86
87 return true;
88}
89
90EXPORT_SYMBOL(nftnl_udata_put_strz);
91bool nftnl_udata_put_strz(struct nftnl_udata_buf *buf, uint8_t type,
92 const char *strz)
93{
94 return nftnl_udata_put(buf, type, strlen(strz) + 1, strz);
95}
96
97EXPORT_SYMBOL(nftnl_udata_put_u32);
98bool nftnl_udata_put_u32(struct nftnl_udata_buf *buf, uint8_t type,
99 uint32_t data)
100{
101 return nftnl_udata_put(buf, type, sizeof(data), &data);
102}
103
104EXPORT_SYMBOL(nftnl_udata_type);
105uint8_t nftnl_udata_type(const struct nftnl_udata *attr)
106{
107 return attr->type;
108}
109
110EXPORT_SYMBOL(nftnl_udata_len);
111uint8_t nftnl_udata_len(const struct nftnl_udata *attr)
112{
113 return attr->len;
114}
115
116EXPORT_SYMBOL(nftnl_udata_get);
117void *nftnl_udata_get(const struct nftnl_udata *attr)
118{
119 return (void *)attr->value;
120}
121
122EXPORT_SYMBOL(nftnl_udata_get_u32);
123uint32_t nftnl_udata_get_u32(const struct nftnl_udata *attr)
124{
125 uint32_t data;
126
127 memcpy(&data, attr->value, sizeof(data));
128
129 return data;
130}
131
132EXPORT_SYMBOL(nftnl_udata_next);
133struct nftnl_udata *nftnl_udata_next(const struct nftnl_udata *attr)
134{
135 return (struct nftnl_udata *)&attr->value[attr->len];
136}
137
138EXPORT_SYMBOL(nftnl_udata_parse);
139int nftnl_udata_parse(const void *data, uint32_t data_len, nftnl_udata_cb_t cb,
140 void *cb_data)
141{
142 int ret = 0;
143 const struct nftnl_udata *attr;
144
145 nftnl_udata_for_each_data(data, data_len, attr) {
146 ret = cb(attr, cb_data);
147 if (ret < 0)
148 return ret;
149 }
150
151 return ret;
152}
153
154EXPORT_SYMBOL(nftnl_udata_nest_start);
155struct nftnl_udata *nftnl_udata_nest_start(struct nftnl_udata_buf *buf,
156 uint8_t type)
157{
158 struct nftnl_udata *ud = nftnl_udata_end(buf);
159
160 nftnl_udata_put(buf, type, 0, NULL);
161
162 return ud;
163}
164
165EXPORT_SYMBOL(nftnl_udata_nest_end);
166void nftnl_udata_nest_end(struct nftnl_udata_buf *buf, struct nftnl_udata *ud)
167{
168 ud->len = buf->end - (char *)ud->value;
169}