libnftnl 1.2.7
last.c
1/*
2 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published
6 * by the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10#include <stdio.h>
11#include <stdint.h>
12#include <arpa/inet.h>
13#include <errno.h>
14#include <inttypes.h>
15
16#include <linux/netfilter/nf_tables.h>
17
18#include "internal.h"
19#include <libmnl/libmnl.h>
20#include <libnftnl/expr.h>
21#include <libnftnl/rule.h>
22
24 uint64_t msecs;
25 uint32_t set;
26};
27
28static int nftnl_expr_last_set(struct nftnl_expr *e, uint16_t type,
29 const void *data, uint32_t data_len)
30{
31 struct nftnl_expr_last *last = nftnl_expr_data(e);
32
33 switch (type) {
34 case NFTNL_EXPR_LAST_MSECS:
35 memcpy(&last->msecs, data, data_len);
36 break;
37 case NFTNL_EXPR_LAST_SET:
38 memcpy(&last->set, data, data_len);
39 break;
40 }
41 return 0;
42}
43
44static const void *nftnl_expr_last_get(const struct nftnl_expr *e,
45 uint16_t type, uint32_t *data_len)
46{
47 struct nftnl_expr_last *last = nftnl_expr_data(e);
48
49 switch (type) {
50 case NFTNL_EXPR_LAST_MSECS:
51 *data_len = sizeof(last->msecs);
52 return &last->msecs;
53 case NFTNL_EXPR_LAST_SET:
54 *data_len = sizeof(last->set);
55 return &last->set;
56 }
57 return NULL;
58}
59
60static int nftnl_expr_last_cb(const struct nlattr *attr, void *data)
61{
62 int type = mnl_attr_get_type(attr);
63 const struct nlattr **tb = data;
64
65 if (mnl_attr_type_valid(attr, NFTA_LAST_MAX) < 0)
66 return MNL_CB_OK;
67
68 switch(type) {
69 case NFTA_LAST_MSECS:
70 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
71 abi_breakage();
72 break;
73 case NFTA_LAST_SET:
74 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
75 abi_breakage();
76 break;
77 }
78
79 tb[type] = attr;
80 return MNL_CB_OK;
81}
82
83static void
84nftnl_expr_last_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
85{
86 struct nftnl_expr_last *last = nftnl_expr_data(e);
87
88 if (e->flags & (1 << NFTNL_EXPR_LAST_MSECS))
89 mnl_attr_put_u64(nlh, NFTA_LAST_MSECS, htobe64(last->msecs));
90 if (e->flags & (1 << NFTNL_EXPR_LAST_SET))
91 mnl_attr_put_u32(nlh, NFTA_LAST_SET, htonl(last->set));
92}
93
94static int
95nftnl_expr_last_parse(struct nftnl_expr *e, struct nlattr *attr)
96{
97 struct nftnl_expr_last *last = nftnl_expr_data(e);
98 struct nlattr *tb[NFTA_LAST_MAX + 1] = {};
99
100 if (mnl_attr_parse_nested(attr, nftnl_expr_last_cb, tb) < 0)
101 return -1;
102
103 if (tb[NFTA_LAST_MSECS]) {
104 last->msecs = be64toh(mnl_attr_get_u64(tb[NFTA_LAST_MSECS]));
105 e->flags |= (1 << NFTNL_EXPR_LAST_MSECS);
106 }
107 if (tb[NFTA_LAST_SET]) {
108 last->set = ntohl(mnl_attr_get_u32(tb[NFTA_LAST_SET]));
109 e->flags |= (1 << NFTNL_EXPR_LAST_SET);
110 }
111
112 return 0;
113}
114
115static int nftnl_expr_last_snprintf(char *buf, size_t len,
116 uint32_t flags,
117 const struct nftnl_expr *e)
118{
119 struct nftnl_expr_last *last = nftnl_expr_data(e);
120
121 if (!last->set)
122 return snprintf(buf, len, "never ");
123
124 return snprintf(buf, len, "%"PRIu64" ", last->msecs);
125}
126
127static struct attr_policy last_attr_policy[__NFTNL_EXPR_LAST_MAX] = {
128 [NFTNL_EXPR_LAST_MSECS] = { .maxlen = sizeof(uint64_t) },
129 [NFTNL_EXPR_LAST_SET] = { .maxlen = sizeof(uint32_t) },
130};
131
132struct expr_ops expr_ops_last = {
133 .name = "last",
134 .alloc_len = sizeof(struct nftnl_expr_last),
135 .nftnl_max_attr = __NFTNL_EXPR_LAST_MAX - 1,
136 .attr_policy = last_attr_policy,
137 .set = nftnl_expr_last_set,
138 .get = nftnl_expr_last_get,
139 .parse = nftnl_expr_last_parse,
140 .build = nftnl_expr_last_build,
141 .output = nftnl_expr_last_snprintf,
142};