libnftnl 1.2.8
expr/counter.c
1/*
2 * (C) 2012 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 * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
10 */
11
12#include <stdio.h>
13#include <stdint.h>
14#include <arpa/inet.h>
15#include <errno.h>
16#include <inttypes.h>
17
18#include <linux/netfilter/nf_tables.h>
19
20#include "internal.h"
21#include <libmnl/libmnl.h>
22#include <libnftnl/expr.h>
23#include <libnftnl/rule.h>
24
26 uint64_t pkts;
27 uint64_t bytes;
28};
29
30static int
31nftnl_expr_counter_set(struct nftnl_expr *e, uint16_t type,
32 const void *data, uint32_t data_len)
33{
34 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
35
36 switch(type) {
37 case NFTNL_EXPR_CTR_BYTES:
38 memcpy(&ctr->bytes, data, data_len);
39 break;
40 case NFTNL_EXPR_CTR_PACKETS:
41 memcpy(&ctr->pkts, data, data_len);
42 break;
43 }
44 return 0;
45}
46
47static const void *
48nftnl_expr_counter_get(const struct nftnl_expr *e, uint16_t type,
49 uint32_t *data_len)
50{
51 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
52
53 switch(type) {
54 case NFTNL_EXPR_CTR_BYTES:
55 *data_len = sizeof(ctr->bytes);
56 return &ctr->bytes;
57 case NFTNL_EXPR_CTR_PACKETS:
58 *data_len = sizeof(ctr->pkts);
59 return &ctr->pkts;
60 }
61 return NULL;
62}
63
64static int nftnl_expr_counter_cb(const struct nlattr *attr, void *data)
65{
66 const struct nlattr **tb = data;
67 int type = mnl_attr_get_type(attr);
68
69 if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
70 return MNL_CB_OK;
71
72 switch(type) {
73 case NFTA_COUNTER_BYTES:
74 case NFTA_COUNTER_PACKETS:
75 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
76 abi_breakage();
77 break;
78 }
79
80 tb[type] = attr;
81 return MNL_CB_OK;
82}
83
84static void
85nftnl_expr_counter_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
86{
87 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
88
89 if (e->flags & (1 << NFTNL_EXPR_CTR_BYTES))
90 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
91 if (e->flags & (1 << NFTNL_EXPR_CTR_PACKETS))
92 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
93}
94
95static int
96nftnl_expr_counter_parse(struct nftnl_expr *e, struct nlattr *attr)
97{
98 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
99 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
100
101 if (mnl_attr_parse_nested(attr, nftnl_expr_counter_cb, tb) < 0)
102 return -1;
103
104 if (tb[NFTA_COUNTER_BYTES]) {
105 ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
106 e->flags |= (1 << NFTNL_EXPR_CTR_BYTES);
107 }
108 if (tb[NFTA_COUNTER_PACKETS]) {
109 ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
110 e->flags |= (1 << NFTNL_EXPR_CTR_PACKETS);
111 }
112
113 return 0;
114}
115
116static int nftnl_expr_counter_snprintf(char *buf, size_t len,
117 uint32_t flags,
118 const struct nftnl_expr *e)
119{
120 struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
121
122 return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
123 ctr->pkts, ctr->bytes);
124}
125
126static struct attr_policy counter_attr_policy[__NFTNL_EXPR_CTR_MAX] = {
127 [NFTNL_EXPR_CTR_PACKETS] = { .maxlen = sizeof(uint64_t) },
128 [NFTNL_EXPR_CTR_BYTES] = { .maxlen = sizeof(uint64_t) },
129};
130
131struct expr_ops expr_ops_counter = {
132 .name = "counter",
133 .alloc_len = sizeof(struct nftnl_expr_counter),
134 .nftnl_max_attr = __NFTNL_EXPR_CTR_MAX - 1,
135 .attr_policy = counter_attr_policy,
136 .set = nftnl_expr_counter_set,
137 .get = nftnl_expr_counter_get,
138 .parse = nftnl_expr_counter_parse,
139 .build = nftnl_expr_counter_build,
140 .output = nftnl_expr_counter_snprintf,
141};