libnftnl 1.2.6
expr/quota.c
1/*
2 * (C) 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 "internal.h"
19#include <libmnl/libmnl.h>
20#include <libnftnl/expr.h>
21#include <libnftnl/rule.h>
22
24 uint64_t bytes;
25 uint64_t consumed;
26 uint32_t flags;
27};
28
29static int nftnl_expr_quota_set(struct nftnl_expr *e, uint16_t type,
30 const void *data, uint32_t data_len)
31{
32 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
33
34 switch (type) {
35 case NFTNL_EXPR_QUOTA_BYTES:
36 memcpy(&quota->bytes, data, sizeof(quota->bytes));
37 break;
38 case NFTNL_EXPR_QUOTA_CONSUMED:
39 memcpy(&quota->consumed, data, sizeof(quota->consumed));
40 break;
41 case NFTNL_EXPR_QUOTA_FLAGS:
42 memcpy(&quota->flags, data, sizeof(quota->flags));
43 break;
44 default:
45 return -1;
46 }
47 return 0;
48}
49
50static const void *nftnl_expr_quota_get(const struct nftnl_expr *e,
51 uint16_t type, uint32_t *data_len)
52{
53 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
54
55 switch (type) {
56 case NFTNL_EXPR_QUOTA_BYTES:
57 *data_len = sizeof(quota->bytes);
58 return &quota->bytes;
59 case NFTNL_EXPR_QUOTA_CONSUMED:
60 *data_len = sizeof(quota->consumed);
61 return &quota->consumed;
62 case NFTNL_EXPR_QUOTA_FLAGS:
63 *data_len = sizeof(quota->flags);
64 return &quota->flags;
65 }
66 return NULL;
67}
68
69static int nftnl_expr_quota_cb(const struct nlattr *attr, void *data)
70{
71 int type = mnl_attr_get_type(attr);
72 const struct nlattr **tb = data;
73
74 if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0)
75 return MNL_CB_OK;
76
77 switch(type) {
78 case NFTA_QUOTA_BYTES:
79 case NFTA_QUOTA_CONSUMED:
80 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
81 abi_breakage();
82 break;
83 case NFTA_QUOTA_FLAGS:
84 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
85 abi_breakage();
86 break;
87 }
88
89 tb[type] = attr;
90 return MNL_CB_OK;
91}
92
93static void
94nftnl_expr_quota_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
95{
96 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
97
98 if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES))
99 mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes));
100 if (e->flags & (1 << NFTNL_EXPR_QUOTA_CONSUMED))
101 mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED, htobe64(quota->consumed));
102 if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS))
103 mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags));
104}
105
106static int
107nftnl_expr_quota_parse(struct nftnl_expr *e, struct nlattr *attr)
108{
109 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
110 struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {};
111
112 if (mnl_attr_parse_nested(attr, nftnl_expr_quota_cb, tb) < 0)
113 return -1;
114
115 if (tb[NFTA_QUOTA_BYTES]) {
116 quota->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_BYTES]));
117 e->flags |= (1 << NFTNL_EXPR_QUOTA_BYTES);
118 }
119 if (tb[NFTA_QUOTA_CONSUMED]) {
120 quota->consumed = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED]));
121 e->flags |= (1 << NFTNL_EXPR_QUOTA_CONSUMED);
122 }
123 if (tb[NFTA_QUOTA_FLAGS]) {
124 quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS]));
125 e->flags |= (1 << NFTNL_EXPR_QUOTA_FLAGS);
126 }
127
128 return 0;
129}
130
131static int nftnl_expr_quota_snprintf(char *buf, size_t len,
132 uint32_t flags,
133 const struct nftnl_expr *e)
134{
135 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
136
137 return snprintf(buf, len,
138 "bytes %"PRIu64" consumed %"PRIu64" flags %u ",
139 quota->bytes, quota->consumed, quota->flags);
140}
141
142struct expr_ops expr_ops_quota = {
143 .name = "quota",
144 .alloc_len = sizeof(struct nftnl_expr_quota),
145 .max_attr = NFTA_QUOTA_MAX,
146 .set = nftnl_expr_quota_set,
147 .get = nftnl_expr_quota_get,
148 .parse = nftnl_expr_quota_parse,
149 .build = nftnl_expr_quota_build,
150 .output = nftnl_expr_quota_snprintf,
151};