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
|
/*
* (C) 2016 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 <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
struct nftnl_expr_last {
uint64_t msecs;
uint32_t set;
};
static int nftnl_expr_last_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_LAST_MSECS:
memcpy(&last->msecs, data, sizeof(last->msecs));
break;
case NFTNL_EXPR_LAST_SET:
memcpy(&last->set, data, sizeof(last->set));
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_expr_last_get(const struct nftnl_expr *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_LAST_MSECS:
*data_len = sizeof(last->msecs);
return &last->msecs;
case NFTNL_EXPR_LAST_SET:
*data_len = sizeof(last->set);
return &last->set;
}
return NULL;
}
static int nftnl_expr_last_cb(const struct nlattr *attr, void *data)
{
int type = mnl_attr_get_type(attr);
const struct nlattr **tb = data;
if (mnl_attr_type_valid(attr, NFTA_LAST_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_LAST_MSECS:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_LAST_SET:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_expr_last_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_LAST_MSECS))
mnl_attr_put_u64(nlh, NFTA_LAST_MSECS, htobe64(last->msecs));
if (e->flags & (1 << NFTNL_EXPR_LAST_SET))
mnl_attr_put_u32(nlh, NFTA_LAST_SET, htonl(last->set));
}
static int
nftnl_expr_last_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
struct nlattr *tb[NFTA_LAST_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_expr_last_cb, tb) < 0)
return -1;
if (tb[NFTA_LAST_MSECS]) {
last->msecs = be64toh(mnl_attr_get_u64(tb[NFTA_LAST_MSECS]));
e->flags |= (1 << NFTNL_EXPR_LAST_MSECS);
}
if (tb[NFTA_LAST_SET]) {
last->set = ntohl(mnl_attr_get_u32(tb[NFTA_LAST_SET]));
e->flags |= (1 << NFTNL_EXPR_LAST_SET);
}
return 0;
}
static int nftnl_expr_last_snprintf(char *buf, size_t len,
uint32_t flags,
const struct nftnl_expr *e)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
if (!last->set)
return snprintf(buf, len, "never ");
return snprintf(buf, len, "%"PRIu64" ", last->msecs);
}
struct expr_ops expr_ops_last = {
.name = "last",
.alloc_len = sizeof(struct nftnl_expr_last),
.max_attr = NFTA_LAST_MAX,
.set = nftnl_expr_last_set,
.get = nftnl_expr_last_get,
.parse = nftnl_expr_last_parse,
.build = nftnl_expr_last_build,
.output = nftnl_expr_last_snprintf,
};
|
