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 
25 static 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 
44 static 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 
63 static 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 
87 static void
88 nftnl_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 
100 static int
101 nftnl_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 
125 static 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 
136 static 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 
142 struct 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 };