libnftnl 1.2.9
last.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5
6#include <stdio.h>
7#include <stdint.h>
8#include <arpa/inet.h>
9#include <errno.h>
10#include <inttypes.h>
11
12#include <linux/netfilter/nf_tables.h>
13
14#include "internal.h"
15#include <libmnl/libmnl.h>
16#include <libnftnl/expr.h>
17#include <libnftnl/rule.h>
18
20 uint64_t msecs;
21 uint32_t set;
22};
23
24static int nftnl_expr_last_set(struct nftnl_expr *e, uint16_t type,
25 const void *data, uint32_t data_len)
26{
27 struct nftnl_expr_last *last = nftnl_expr_data(e);
28
29 switch (type) {
30 case NFTNL_EXPR_LAST_MSECS:
31 memcpy(&last->msecs, data, data_len);
32 break;
33 case NFTNL_EXPR_LAST_SET:
34 memcpy(&last->set, data, data_len);
35 break;
36 }
37 return 0;
38}
39
40static const void *nftnl_expr_last_get(const struct nftnl_expr *e,
41 uint16_t type, uint32_t *data_len)
42{
43 struct nftnl_expr_last *last = nftnl_expr_data(e);
44
45 switch (type) {
46 case NFTNL_EXPR_LAST_MSECS:
47 *data_len = sizeof(last->msecs);
48 return &last->msecs;
49 case NFTNL_EXPR_LAST_SET:
50 *data_len = sizeof(last->set);
51 return &last->set;
52 }
53 return NULL;
54}
55
56static int nftnl_expr_last_cb(const struct nlattr *attr, void *data)
57{
58 int type = mnl_attr_get_type(attr);
59 const struct nlattr **tb = data;
60
61 if (mnl_attr_type_valid(attr, NFTA_LAST_MAX) < 0)
62 return MNL_CB_OK;
63
64 switch(type) {
65 case NFTA_LAST_MSECS:
66 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
67 abi_breakage();
68 break;
69 case NFTA_LAST_SET:
70 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
71 abi_breakage();
72 break;
73 }
74
75 tb[type] = attr;
76 return MNL_CB_OK;
77}
78
79static void
80nftnl_expr_last_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
81{
82 struct nftnl_expr_last *last = nftnl_expr_data(e);
83
84 if (e->flags & (1 << NFTNL_EXPR_LAST_MSECS))
85 mnl_attr_put_u64(nlh, NFTA_LAST_MSECS, htobe64(last->msecs));
86 if (e->flags & (1 << NFTNL_EXPR_LAST_SET))
87 mnl_attr_put_u32(nlh, NFTA_LAST_SET, htonl(last->set));
88}
89
90static int
91nftnl_expr_last_parse(struct nftnl_expr *e, struct nlattr *attr)
92{
93 struct nftnl_expr_last *last = nftnl_expr_data(e);
94 struct nlattr *tb[NFTA_LAST_MAX + 1] = {};
95
96 if (mnl_attr_parse_nested(attr, nftnl_expr_last_cb, tb) < 0)
97 return -1;
98
99 if (tb[NFTA_LAST_MSECS]) {
100 last->msecs = be64toh(mnl_attr_get_u64(tb[NFTA_LAST_MSECS]));
101 e->flags |= (1 << NFTNL_EXPR_LAST_MSECS);
102 }
103 if (tb[NFTA_LAST_SET]) {
104 last->set = ntohl(mnl_attr_get_u32(tb[NFTA_LAST_SET]));
105 e->flags |= (1 << NFTNL_EXPR_LAST_SET);
106 }
107
108 return 0;
109}
110
111static int nftnl_expr_last_snprintf(char *buf, size_t len,
112 uint32_t flags,
113 const struct nftnl_expr *e)
114{
115 struct nftnl_expr_last *last = nftnl_expr_data(e);
116
117 if (!last->set)
118 return snprintf(buf, len, "never ");
119
120 return snprintf(buf, len, "%"PRIu64" ", last->msecs);
121}
122
123static struct attr_policy last_attr_policy[__NFTNL_EXPR_LAST_MAX] = {
124 [NFTNL_EXPR_LAST_MSECS] = { .maxlen = sizeof(uint64_t) },
125 [NFTNL_EXPR_LAST_SET] = { .maxlen = sizeof(uint32_t) },
126};
127
128struct expr_ops expr_ops_last = {
129 .name = "last",
130 .alloc_len = sizeof(struct nftnl_expr_last),
131 .nftnl_max_attr = __NFTNL_EXPR_LAST_MAX - 1,
132 .attr_policy = last_attr_policy,
133 .set = nftnl_expr_last_set,
134 .get = nftnl_expr_last_get,
135 .parse = nftnl_expr_last_parse,
136 .build = nftnl_expr_last_build,
137 .output = nftnl_expr_last_snprintf,
138};