libnftnl 1.2.9
expr/quota.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5
6#include <stdio.h>
7#include <stdint.h>
8#include <arpa/inet.h>
9#include <errno.h>
10#include <inttypes.h>
11
12#include <linux/netfilter/nf_tables.h>
13
14#include "internal.h"
15#include <libmnl/libmnl.h>
16#include <libnftnl/expr.h>
17#include <libnftnl/rule.h>
18
20 uint64_t bytes;
21 uint64_t consumed;
22 uint32_t flags;
23};
24
25static int nftnl_expr_quota_set(struct nftnl_expr *e, uint16_t type,
26 const void *data, uint32_t data_len)
27{
28 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
29
30 switch (type) {
31 case NFTNL_EXPR_QUOTA_BYTES:
32 memcpy(&quota->bytes, data, data_len);
33 break;
34 case NFTNL_EXPR_QUOTA_CONSUMED:
35 memcpy(&quota->consumed, data, data_len);
36 break;
37 case NFTNL_EXPR_QUOTA_FLAGS:
38 memcpy(&quota->flags, data, data_len);
39 break;
40 }
41 return 0;
42}
43
44static const void *nftnl_expr_quota_get(const struct nftnl_expr *e,
45 uint16_t type, uint32_t *data_len)
46{
47 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
48
49 switch (type) {
50 case NFTNL_EXPR_QUOTA_BYTES:
51 *data_len = sizeof(quota->bytes);
52 return &quota->bytes;
53 case NFTNL_EXPR_QUOTA_CONSUMED:
54 *data_len = sizeof(quota->consumed);
55 return &quota->consumed;
56 case NFTNL_EXPR_QUOTA_FLAGS:
57 *data_len = sizeof(quota->flags);
58 return &quota->flags;
59 }
60 return NULL;
61}
62
63static int nftnl_expr_quota_cb(const struct nlattr *attr, void *data)
64{
65 int type = mnl_attr_get_type(attr);
66 const struct nlattr **tb = data;
67
68 if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0)
69 return MNL_CB_OK;
70
71 switch(type) {
72 case NFTA_QUOTA_BYTES:
73 case NFTA_QUOTA_CONSUMED:
74 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
75 abi_breakage();
76 break;
77 case NFTA_QUOTA_FLAGS:
78 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
79 abi_breakage();
80 break;
81 }
82
83 tb[type] = attr;
84 return MNL_CB_OK;
85}
86
87static void
88nftnl_expr_quota_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
89{
90 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
91
92 if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES))
93 mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes));
94 if (e->flags & (1 << NFTNL_EXPR_QUOTA_CONSUMED))
95 mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED, htobe64(quota->consumed));
96 if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS))
97 mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags));
98}
99
100static int
101nftnl_expr_quota_parse(struct nftnl_expr *e, struct nlattr *attr)
102{
103 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
104 struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {};
105
106 if (mnl_attr_parse_nested(attr, nftnl_expr_quota_cb, tb) < 0)
107 return -1;
108
109 if (tb[NFTA_QUOTA_BYTES]) {
110 quota->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_BYTES]));
111 e->flags |= (1 << NFTNL_EXPR_QUOTA_BYTES);
112 }
113 if (tb[NFTA_QUOTA_CONSUMED]) {
114 quota->consumed = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED]));
115 e->flags |= (1 << NFTNL_EXPR_QUOTA_CONSUMED);
116 }
117 if (tb[NFTA_QUOTA_FLAGS]) {
118 quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS]));
119 e->flags |= (1 << NFTNL_EXPR_QUOTA_FLAGS);
120 }
121
122 return 0;
123}
124
125static int nftnl_expr_quota_snprintf(char *buf, size_t len,
126 uint32_t flags,
127 const struct nftnl_expr *e)
128{
129 struct nftnl_expr_quota *quota = nftnl_expr_data(e);
130
131 return snprintf(buf, len,
132 "bytes %"PRIu64" consumed %"PRIu64" flags %u ",
133 quota->bytes, quota->consumed, quota->flags);
134}
135
136static struct attr_policy quota_attr_policy[__NFTNL_EXPR_QUOTA_MAX] = {
137 [NFTNL_EXPR_QUOTA_BYTES] = { .maxlen = sizeof(uint64_t) },
138 [NFTNL_EXPR_QUOTA_FLAGS] = { .maxlen = sizeof(uint32_t) },
139 [NFTNL_EXPR_QUOTA_CONSUMED] = { .maxlen = sizeof(uint64_t) },
140};
141
142struct expr_ops expr_ops_quota = {
143 .name = "quota",
144 .alloc_len = sizeof(struct nftnl_expr_quota),
145 .nftnl_max_attr = __NFTNL_EXPR_QUOTA_MAX - 1,
146 .attr_policy = quota_attr_policy,
147 .set = nftnl_expr_quota_set,
148 .get = nftnl_expr_quota_get,
149 .parse = nftnl_expr_quota_parse,
150 .build = nftnl_expr_quota_build,
151 .output = nftnl_expr_quota_snprintf,
152};