libnftnl 1.2.6
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, sizeof(ctr->bytes));
33 break;
34 case NFTNL_OBJ_CTR_PKTS:
35 memcpy(&ctr->pkts, data, sizeof(ctr->pkts));
36 break;
37 default:
38 return -1;
39 }
40 return 0;
41}
42
43static const void *
44nftnl_obj_counter_get(const struct nftnl_obj *e, uint16_t type,
45 uint32_t *data_len)
46{
47 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
48
49 switch(type) {
50 case NFTNL_OBJ_CTR_BYTES:
51 *data_len = sizeof(ctr->bytes);
52 return &ctr->bytes;
53 case NFTNL_OBJ_CTR_PKTS:
54 *data_len = sizeof(ctr->pkts);
55 return &ctr->pkts;
56 }
57 return NULL;
58}
59
60static int nftnl_obj_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_obj_counter_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
82{
83 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
84
85 if (e->flags & (1 << NFTNL_OBJ_CTR_BYTES))
86 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
87 if (e->flags & (1 << NFTNL_OBJ_CTR_PKTS))
88 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
89}
90
91static int
92nftnl_obj_counter_parse(struct nftnl_obj *e, struct nlattr *attr)
93{
94 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
95 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
96
97 if (mnl_attr_parse_nested(attr, nftnl_obj_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_OBJ_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_OBJ_CTR_PKTS);
107 }
108
109 return 0;
110}
111
112static int nftnl_obj_counter_snprintf(char *buf, size_t len, uint32_t flags,
113 const struct nftnl_obj *e)
114{
115 struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
116
117 return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
118 ctr->pkts, ctr->bytes);
119}
120
121struct obj_ops obj_ops_counter = {
122 .name = "counter",
123 .type = NFT_OBJECT_COUNTER,
124 .alloc_len = sizeof(struct nftnl_obj_counter),
125 .max_attr = NFTA_COUNTER_MAX,
126 .set = nftnl_obj_counter_set,
127 .get = nftnl_obj_counter_get,
128 .parse = nftnl_obj_counter_parse,
129 .build = nftnl_obj_counter_build,
130 .output = nftnl_obj_counter_snprintf,
131};