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
|
/*
* Number generator expression definitions.
*
* Copyright (c) 2016 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 version 2 (or any
* later) as published by the Free Software Foundation.
*/
#include <nft.h>
#include <nftables.h>
#include <expression.h>
#include <datatype.h>
#include <gmputil.h>
#include <numgen.h>
#include <utils.h>
static const char *numgen_type[NFT_NG_RANDOM + 1] = {
[NFT_NG_INCREMENTAL] = "inc",
[NFT_NG_RANDOM] = "random",
};
static const char *numgen_type_str(enum nft_ng_types type)
{
if (type > NFT_NG_RANDOM)
return "[unknown numgen]";
return numgen_type[type];
}
static void numgen_expr_print(const struct expr *expr, struct output_ctx *octx)
{
nft_print(octx, "numgen %s mod %u",
numgen_type_str(expr->numgen.type),
expr->numgen.mod);
if (expr->numgen.offset)
nft_print(octx, " offset %u", expr->numgen.offset);
}
static bool numgen_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->numgen.type == e2->numgen.type &&
e1->numgen.mod == e2->numgen.mod &&
e1->numgen.offset == e2->numgen.offset;
}
static void numgen_expr_clone(struct expr *new, const struct expr *expr)
{
new->numgen.type = expr->numgen.type;
new->numgen.mod = expr->numgen.mod;
new->numgen.offset = expr->numgen.offset;
}
#define NFTNL_UDATA_NUMGEN_TYPE 0
#define NFTNL_UDATA_NUMGEN_MOD 1
#define NFTNL_UDATA_NUMGEN_OFFSET 2
#define NFTNL_UDATA_NUMGEN_MAX 3
static int numgen_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_TYPE, expr->numgen.type);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_MOD, expr->numgen.mod);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_OFFSET, expr->numgen.offset);
return 0;
}
static int numgen_parse_udata(const struct nftnl_udata *attr, void *data)
{
const struct nftnl_udata **ud = data;
uint8_t type = nftnl_udata_type(attr);
uint8_t len = nftnl_udata_len(attr);
switch (type) {
case NFTNL_UDATA_NUMGEN_TYPE:
case NFTNL_UDATA_NUMGEN_MOD:
case NFTNL_UDATA_NUMGEN_OFFSET:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *numgen_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_NUMGEN_MAX + 1] = {};
enum nft_ng_types type;
uint32_t mod, offset;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
numgen_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_NUMGEN_TYPE] ||
!ud[NFTNL_UDATA_NUMGEN_MOD] ||
!ud[NFTNL_UDATA_NUMGEN_OFFSET])
return NULL;
type = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_TYPE]);
mod = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_MOD]);
offset = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_OFFSET]);
return numgen_expr_alloc(&internal_location, type, mod, offset);
}
const struct expr_ops numgen_expr_ops = {
.type = EXPR_NUMGEN,
.name = "numgen",
.print = numgen_expr_print,
.json = numgen_expr_json,
.cmp = numgen_expr_cmp,
.clone = numgen_expr_clone,
.parse_udata = numgen_expr_parse_udata,
.build_udata = numgen_expr_build_udata,
};
struct expr *numgen_expr_alloc(const struct location *loc,
enum nft_ng_types type, uint32_t mod,
uint32_t offset)
{
struct expr *expr;
expr = expr_alloc(loc, EXPR_NUMGEN, &integer_type,
BYTEORDER_HOST_ENDIAN, 4 * BITS_PER_BYTE);
expr->numgen.type = type;
expr->numgen.mod = mod;
expr->numgen.offset = offset;
return expr;
}
|
