libnftnl 1.2.8
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, data_len);
37 break;
38 case NFTNL_EXPR_QUOTA_CONSUMED:
39 memcpy(&quota->consumed, data, data_len);
40 break;
41 case NFTNL_EXPR_QUOTA_FLAGS:
42 memcpy(&quota->flags, data, data_len);
43 break;
44 }
45 return 0;
46}
47
48static const void *nftnl_expr_quota_get(const struct nftnl_expr *e,
49 uint16_t type, uint32_t *data_len)
50{
51 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
52
53 switch (type) {
54 case NFTNL_EXPR_QUOTA_BYTES:
55 *data_len = sizeof(quota->bytes);
56 return &quota->bytes;
57 case NFTNL_EXPR_QUOTA_CONSUMED:
58 *data_len = sizeof(quota->consumed);
59 return &quota->consumed;
60 case NFTNL_EXPR_QUOTA_FLAGS:
61 *data_len = sizeof(quota->flags);
62 return &quota->flags;
63 }
64 return NULL;
65}
66
67static int nftnl_expr_quota_cb(const struct nlattr *attr, void *data)
68{
69 int type = mnl_attr_get_type(attr);
70 const struct nlattr **tb = data;
71
72 if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0)
73 return MNL_CB_OK;
74
75 switch(type) {
76 case NFTA_QUOTA_BYTES:
77 case NFTA_QUOTA_CONSUMED:
78 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
79 abi_breakage();
80 break;
81 case NFTA_QUOTA_FLAGS:
82 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
83 abi_breakage();
84 break;
85 }
86
87 tb[type] = attr;
88 return MNL_CB_OK;
89}
90
91static void
92nftnl_expr_quota_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
93{
94 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
95
96 if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES))
97 mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes));
98 if (e->flags & (1 << NFTNL_EXPR_QUOTA_CONSUMED))
99 mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED, htobe64(quota->consumed));
100 if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS))
101 mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags));
102}
103
104static int
105nftnl_expr_quota_parse(struct nftnl_expr *e, struct nlattr *attr)
106{
107 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
108 struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {};
109
110 if (mnl_attr_parse_nested(attr, nftnl_expr_quota_cb, tb) < 0)
111 return -1;
112
113 if (tb[NFTA_QUOTA_BYTES]) {
114 quota->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_BYTES]));
115 e->flags |= (1 << NFTNL_EXPR_QUOTA_BYTES);
116 }
117 if (tb[NFTA_QUOTA_CONSUMED]) {
118 quota->consumed = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED]));
119 e->flags |= (1 << NFTNL_EXPR_QUOTA_CONSUMED);
120 }
121 if (tb[NFTA_QUOTA_FLAGS]) {
122 quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS]));
123 e->flags |= (1 << NFTNL_EXPR_QUOTA_FLAGS);
124 }
125
126 return 0;
127}
128
129static int nftnl_expr_quota_snprintf(char *buf, size_t len,
130 uint32_t flags,
131 const struct nftnl_expr *e)
132{
133 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
134
135 return snprintf(buf, len,
136 "bytes %"PRIu64" consumed %"PRIu64" flags %u ",
137 quota->bytes, quota->consumed, quota->flags);
138}
139
140static struct attr_policy quota_attr_policy[__NFTNL_EXPR_QUOTA_MAX] = {
141 [NFTNL_EXPR_QUOTA_BYTES] = { .maxlen = sizeof(uint64_t) },
142 [NFTNL_EXPR_QUOTA_FLAGS] = { .maxlen = sizeof(uint32_t) },
143 [NFTNL_EXPR_QUOTA_CONSUMED] = { .maxlen = sizeof(uint64_t) },
144};
145
146struct expr_ops expr_ops_quota = {
147 .name = "quota",
148 .alloc_len = sizeof(struct nftnl_expr_quota),
149 .nftnl_max_attr = __NFTNL_EXPR_QUOTA_MAX - 1,
150 .attr_policy = quota_attr_policy,
151 .set = nftnl_expr_quota_set,
152 .get = nftnl_expr_quota_get,
153 .parse = nftnl_expr_quota_parse,
154 .build = nftnl_expr_quota_build,
155 .output = nftnl_expr_quota_snprintf,
156};