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
|
/*
* (C) 2012-2022 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include "internal.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <limits.h>
#include <arpa/inet.h>
#include <errno.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
struct nftnl_expr_inner {
uint32_t type;
uint32_t flags;
uint32_t hdrsize;
struct nftnl_expr *expr;
};
static void nftnl_expr_inner_free(const struct nftnl_expr *e)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
if (inner->expr)
nftnl_expr_free(inner->expr);
}
static int
nftnl_expr_inner_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_INNER_TYPE:
memcpy(&inner->type, data, sizeof(inner->type));
break;
case NFTNL_EXPR_INNER_FLAGS:
memcpy(&inner->flags, data, sizeof(inner->flags));
break;
case NFTNL_EXPR_INNER_HDRSIZE:
memcpy(&inner->hdrsize, data, sizeof(inner->hdrsize));
break;
case NFTNL_EXPR_INNER_EXPR:
if (inner->expr)
nftnl_expr_free(inner->expr);
inner->expr = (void *)data;
break;
default:
return -1;
}
return 0;
}
static const void *
nftnl_expr_inner_get(const struct nftnl_expr *e, uint16_t type,
uint32_t *data_len)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_INNER_FLAGS:
*data_len = sizeof(inner->flags);
return &inner->flags;
case NFTNL_EXPR_INNER_TYPE:
*data_len = sizeof(inner->type);
return &inner->type;
case NFTNL_EXPR_INNER_HDRSIZE:
*data_len = sizeof(inner->hdrsize);
return &inner->hdrsize;
case NFTNL_EXPR_INNER_EXPR:
return inner->expr;
}
return NULL;
}
static void
nftnl_expr_inner_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
struct nlattr *nest;
mnl_attr_put_u32(nlh, NFTA_INNER_NUM, htonl(0));
if (e->flags & (1 << NFTNL_EXPR_INNER_TYPE))
mnl_attr_put_u32(nlh, NFTA_INNER_TYPE, htonl(inner->type));
if (e->flags & (1 << NFTNL_EXPR_INNER_FLAGS))
mnl_attr_put_u32(nlh, NFTA_INNER_FLAGS, htonl(inner->flags));
if (e->flags & (1 << NFTNL_EXPR_INNER_HDRSIZE))
mnl_attr_put_u32(nlh, NFTA_INNER_HDRSIZE, htonl(inner->hdrsize));
if (e->flags & (1 << NFTNL_EXPR_INNER_EXPR)) {
nest = mnl_attr_nest_start(nlh, NFTA_INNER_EXPR);
nftnl_expr_build_payload(nlh, inner->expr);
mnl_attr_nest_end(nlh, nest);
}
}
static int nftnl_inner_parse_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_INNER_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_INNER_NUM:
case NFTA_INNER_TYPE:
case NFTA_INNER_HDRSIZE:
case NFTA_INNER_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
case NFTA_INNER_EXPR:
if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int
nftnl_expr_inner_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
struct nlattr *tb[NFTA_INNER_MAX + 1] = {};
struct nftnl_expr *expr;
int err;
err = mnl_attr_parse_nested(attr, nftnl_inner_parse_cb, tb);
if (err < 0)
return err;
if (tb[NFTA_INNER_HDRSIZE]) {
inner->hdrsize =
ntohl(mnl_attr_get_u32(tb[NFTA_INNER_HDRSIZE]));
e->flags |= (1 << NFTNL_EXPR_INNER_HDRSIZE);
}
if (tb[NFTA_INNER_FLAGS]) {
inner->flags =
ntohl(mnl_attr_get_u32(tb[NFTA_INNER_FLAGS]));
e->flags |= (1 << NFTNL_EXPR_INNER_FLAGS);
}
if (tb[NFTA_INNER_TYPE]) {
inner->type =
ntohl(mnl_attr_get_u32(tb[NFTA_INNER_TYPE]));
e->flags |= (1 << NFTNL_EXPR_INNER_TYPE);
}
if (tb[NFTA_INNER_EXPR]) {
expr = nftnl_expr_parse(tb[NFTA_INNER_EXPR]);
if (!expr)
return -1;
if (inner->expr)
nftnl_expr_free(inner->expr);
inner->expr = expr;
e->flags |= (1 << NFTNL_EXPR_INNER_EXPR);
}
return 0;
}
static int
nftnl_expr_inner_snprintf(char *buf, size_t remain, uint32_t flags,
const struct nftnl_expr *e)
{
struct nftnl_expr_inner *inner = nftnl_expr_data(e);
uint32_t offset = 0;
int ret;
ret = snprintf(buf, remain, "type %u hdrsize %u flags %x [",
inner->type, inner->hdrsize, inner->flags);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = snprintf(buf + offset, remain, " %s ", inner->expr->ops->name);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = nftnl_expr_snprintf(buf + offset, remain, inner->expr,
NFTNL_OUTPUT_DEFAULT, 0);
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
ret = snprintf(buf + offset, remain, "] ");
SNPRINTF_BUFFER_SIZE(ret, remain, offset);
return offset;
}
struct expr_ops expr_ops_inner = {
.name = "inner",
.alloc_len = sizeof(struct nftnl_expr_inner),
.max_attr = NFTA_INNER_MAX,
.free = nftnl_expr_inner_free,
.set = nftnl_expr_inner_set,
.get = nftnl_expr_inner_get,
.parse = nftnl_expr_inner_parse,
.build = nftnl_expr_inner_build,
.output = nftnl_expr_inner_snprintf,
};
|
