libnftnl 1.2.9
expr/counter.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4 *
5 * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
6 */
7
8#include <stdio.h>
9#include <stdint.h>
10#include <arpa/inet.h>
11#include <errno.h>
12#include <inttypes.h>
13
14#include <linux/netfilter/nf_tables.h>
15
16#include "internal.h"
17#include <libmnl/libmnl.h>
18#include <libnftnl/expr.h>
19#include <libnftnl/rule.h>
20
22 uint64_t pkts;
23 uint64_t bytes;
24};
25
26static int
27nftnl_expr_counter_set(struct nftnl_expr *e, uint16_t type,
28 const void *data, uint32_t data_len)
29{
30 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
31
32 switch(type) {
33 case NFTNL_EXPR_CTR_BYTES:
34 memcpy(&ctr->bytes, data, data_len);
35 break;
36 case NFTNL_EXPR_CTR_PACKETS:
37 memcpy(&ctr->pkts, data, data_len);
38 break;
39 }
40 return 0;
41}
42
43static const void *
44nftnl_expr_counter_get(const struct nftnl_expr *e, uint16_t type,
45 uint32_t *data_len)
46{
47 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
48
49 switch(type) {
50 case NFTNL_EXPR_CTR_BYTES:
51 *data_len = sizeof(ctr->bytes);
52 return &ctr->bytes;
53 case NFTNL_EXPR_CTR_PACKETS:
54 *data_len = sizeof(ctr->pkts);
55 return &ctr->pkts;
56 }
57 return NULL;
58}
59
60static int nftnl_expr_counter_cb(const struct nlattr *attr, void *data)
61{
62 const struct nlattr **tb = data;
63 int type = mnl_attr_get_type(attr);
64
65 if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
66 return MNL_CB_OK;
67
68 switch(type) {
69 case NFTA_COUNTER_BYTES:
70 case NFTA_COUNTER_PACKETS:
71 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
72 abi_breakage();
73 break;
74 }
75
76 tb[type] = attr;
77 return MNL_CB_OK;
78}
79
80static void
81nftnl_expr_counter_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
82{
83 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
84
85 if (e->flags & (1 << NFTNL_EXPR_CTR_BYTES))
86 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
87 if (e->flags & (1 << NFTNL_EXPR_CTR_PACKETS))
88 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
89}
90
91static int
92nftnl_expr_counter_parse(struct nftnl_expr *e, struct nlattr *attr)
93{
94 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
95 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
96
97 if (mnl_attr_parse_nested(attr, nftnl_expr_counter_cb, tb) < 0)
98 return -1;
99
100 if (tb[NFTA_COUNTER_BYTES]) {
101 ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
102 e->flags |= (1 << NFTNL_EXPR_CTR_BYTES);
103 }
104 if (tb[NFTA_COUNTER_PACKETS]) {
105 ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
106 e->flags |= (1 << NFTNL_EXPR_CTR_PACKETS);
107 }
108
109 return 0;
110}
111
112static int nftnl_expr_counter_snprintf(char *buf, size_t len,
113 uint32_t flags,
114 const struct nftnl_expr *e)
115{
116 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
117
118 return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
119 ctr->pkts, ctr->bytes);
120}
121
122static struct attr_policy counter_attr_policy[__NFTNL_EXPR_CTR_MAX] = {
123 [NFTNL_EXPR_CTR_PACKETS] = { .maxlen = sizeof(uint64_t) },
124 [NFTNL_EXPR_CTR_BYTES] = { .maxlen = sizeof(uint64_t) },
125};
126
127struct expr_ops expr_ops_counter = {
128 .name = "counter",
129 .alloc_len = sizeof(struct nftnl_expr_counter),
130 .nftnl_max_attr = __NFTNL_EXPR_CTR_MAX - 1,
131 .attr_policy = counter_attr_policy,
132 .set = nftnl_expr_counter_set,
133 .get = nftnl_expr_counter_get,
134 .parse = nftnl_expr_counter_parse,
135 .build = nftnl_expr_counter_build,
136 .output = nftnl_expr_counter_snprintf,
137};