libnftnl 1.2.8
obj/counter.c
1/*
2 * (C) 2012-2016 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 <libmnl/libmnl.h>
19#include <libnftnl/object.h>
20
21#include "internal.h"
22#include "obj.h"
23
24static int
25nftnl_obj_counter_set(struct nftnl_obj *e, uint16_t type,
26 const void *data, uint32_t data_len)
27{
28 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
29
30 switch(type) {
31 case NFTNL_OBJ_CTR_BYTES:
32 memcpy(&ctr->bytes, data, data_len);
33 break;
34 case NFTNL_OBJ_CTR_PKTS:
35 memcpy(&ctr->pkts, data, data_len);
36 break;
37 }
38 return 0;
39}
40
41static const void *
42nftnl_obj_counter_get(const struct nftnl_obj *e, uint16_t type,
43 uint32_t *data_len)
44{
45 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
46
47 switch(type) {
48 case NFTNL_OBJ_CTR_BYTES:
49 *data_len = sizeof(ctr->bytes);
50 return &ctr->bytes;
51 case NFTNL_OBJ_CTR_PKTS:
52 *data_len = sizeof(ctr->pkts);
53 return &ctr->pkts;
54 }
55 return NULL;
56}
57
58static int nftnl_obj_counter_cb(const struct nlattr *attr, void *data)
59{
60 const struct nlattr **tb = data;
61 int type = mnl_attr_get_type(attr);
62
63 if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
64 return MNL_CB_OK;
65
66 switch(type) {
67 case NFTA_COUNTER_BYTES:
68 case NFTA_COUNTER_PACKETS:
69 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
70 abi_breakage();
71 break;
72 }
73
74 tb[type] = attr;
75 return MNL_CB_OK;
76}
77
78static void
79nftnl_obj_counter_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
80{
81 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
82
83 if (e->flags & (1 << NFTNL_OBJ_CTR_BYTES))
84 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
85 if (e->flags & (1 << NFTNL_OBJ_CTR_PKTS))
86 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
87}
88
89static int
90nftnl_obj_counter_parse(struct nftnl_obj *e, struct nlattr *attr)
91{
92 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
93 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
94
95 if (mnl_attr_parse_nested(attr, nftnl_obj_counter_cb, tb) < 0)
96 return -1;
97
98 if (tb[NFTA_COUNTER_BYTES]) {
99 ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
100 e->flags |= (1 << NFTNL_OBJ_CTR_BYTES);
101 }
102 if (tb[NFTA_COUNTER_PACKETS]) {
103 ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
104 e->flags |= (1 << NFTNL_OBJ_CTR_PKTS);
105 }
106
107 return 0;
108}
109
110static int nftnl_obj_counter_snprintf(char *buf, size_t len, uint32_t flags,
111 const struct nftnl_obj *e)
112{
113 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
114
115 return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
116 ctr->pkts, ctr->bytes);
117}
118
119static struct attr_policy obj_ctr_attr_policy[__NFTNL_OBJ_CTR_MAX] = {
120 [NFTNL_OBJ_CTR_BYTES] = { .maxlen = sizeof(uint64_t) },
121 [NFTNL_OBJ_CTR_PKTS] = { .maxlen = sizeof(uint64_t) },
122};
123
124struct obj_ops obj_ops_counter = {
125 .name = "counter",
126 .type = NFT_OBJECT_COUNTER,
127 .alloc_len = sizeof(struct nftnl_obj_counter),
128 .nftnl_max_attr = __NFTNL_OBJ_CTR_MAX - 1,
129 .attr_policy = obj_ctr_attr_policy,
130 .set = nftnl_obj_counter_set,
131 .get = nftnl_obj_counter_get,
132 .parse = nftnl_obj_counter_parse,
133 .build = nftnl_obj_counter_build,
134 .output = nftnl_obj_counter_snprintf,
135};