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 
29 static 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 
48 static 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 
67 static 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 
91 static void
92 nftnl_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 
104 static int
105 nftnl_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 
129 static 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 
140 static 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 
146 struct 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 };