libnftnl  1.1.5
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, 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 
50 static 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 
69 static 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 
93 static void
94 nftnl_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 
106 static int
107 nftnl_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 
131 static int nftnl_expr_quota_snprintf_default(char *buf, size_t len,
132  const struct nftnl_expr *e)
133 {
134  struct nftnl_expr_quota *quota = nftnl_expr_data(e);
135 
136  return snprintf(buf, len,
137  "bytes %"PRIu64" consumed %"PRIu64" flags %u ",
138  quota->bytes, quota->consumed, quota->flags);
139 }
140 
141 static int nftnl_expr_quota_snprintf(char *buf, size_t len, uint32_t type,
142  uint32_t flags,
143  const struct nftnl_expr *e)
144 {
145  switch (type) {
146  case NFTNL_OUTPUT_DEFAULT:
147  return nftnl_expr_quota_snprintf_default(buf, len, e);
148  case NFTNL_OUTPUT_XML:
149  case NFTNL_OUTPUT_JSON:
150  default:
151  break;
152  }
153  return -1;
154 }
155 
156 struct expr_ops expr_ops_quota = {
157  .name = "quota",
158  .alloc_len = sizeof(struct nftnl_expr_quota),
159  .max_attr = NFTA_QUOTA_MAX,
160  .set = nftnl_expr_quota_set,
161  .get = nftnl_expr_quota_get,
162  .parse = nftnl_expr_quota_parse,
163  .build = nftnl_expr_quota_build,
164  .snprintf = nftnl_expr_quota_snprintf,
165 };