libnftnl  1.0.8
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  quota->bytes = *((uint64_t *)data);
37  break;
38  case NFTNL_EXPR_QUOTA_CONSUMED:
39  quota->consumed = *((uint64_t *)data);
40  break;
41  case NFTNL_EXPR_QUOTA_FLAGS:
42  quota->flags = *((uint32_t *)data);
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
132 nftnl_expr_quota_json_parse(struct nftnl_expr *e, json_t *root,
133  struct nftnl_parse_err *err)
134 {
135 #ifdef JSON_PARSING
136  uint64_t bytes, consumed;
137  uint32_t flags;
138 
139  if (nftnl_jansson_parse_val(root, "bytes", NFTNL_TYPE_U64, &bytes,
140  err) == 0)
141  nftnl_expr_set_u64(e, NFTNL_EXPR_QUOTA_BYTES, bytes);
142  if (nftnl_jansson_parse_val(root, "consumed", NFTNL_TYPE_U64, &consumed,
143  err) == 0)
144  nftnl_expr_set_u64(e, NFTNL_EXPR_QUOTA_CONSUMED, consumed);
145  if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &flags,
146  err) == 0)
147  nftnl_expr_set_u32(e, NFTNL_EXPR_QUOTA_FLAGS, flags);
148 
149  return 0;
150 #else
151  errno = EOPNOTSUPP;
152  return -1;
153 #endif
154 }
155 
156 static int nftnl_expr_quota_export(char *buf, size_t size,
157  const struct nftnl_expr *e, int type)
158 {
159  struct nftnl_expr_quota *quota = nftnl_expr_data(e);
160  NFTNL_BUF_INIT(b, buf, size);
161 
162  if (e->flags & (1 << NFTNL_EXPR_QUOTA_BYTES))
163  nftnl_buf_u64(&b, type, quota->bytes, BYTES);
164  if (e->flags & (1 << NFTNL_EXPR_QUOTA_CONSUMED))
165  nftnl_buf_u64(&b, type, quota->consumed, CONSUMED);
166  if (e->flags & (1 << NFTNL_EXPR_QUOTA_FLAGS))
167  nftnl_buf_u32(&b, type, quota->flags, FLAGS);
168 
169  return nftnl_buf_done(&b);
170 }
171 
172 static int nftnl_expr_quota_snprintf_default(char *buf, size_t len,
173  const struct nftnl_expr *e)
174 {
175  struct nftnl_expr_quota *quota = nftnl_expr_data(e);
176 
177  return snprintf(buf, len,
178  "bytes %"PRIu64" consumed %"PRIu64" flags %u ",
179  quota->bytes, quota->consumed, quota->flags);
180 }
181 
182 static int nftnl_expr_quota_snprintf(char *buf, size_t len, uint32_t type,
183  uint32_t flags,
184  const struct nftnl_expr *e)
185 {
186  switch (type) {
187  case NFTNL_OUTPUT_DEFAULT:
188  return nftnl_expr_quota_snprintf_default(buf, len, e);
189  case NFTNL_OUTPUT_XML:
190  case NFTNL_OUTPUT_JSON:
191  return nftnl_expr_quota_export(buf, len, e, type);
192  default:
193  break;
194  }
195  return -1;
196 }
197 
198 struct expr_ops expr_ops_quota = {
199  .name = "quota",
200  .alloc_len = sizeof(struct nftnl_expr_quota),
201  .max_attr = NFTA_QUOTA_MAX,
202  .set = nftnl_expr_quota_set,
203  .get = nftnl_expr_quota_get,
204  .parse = nftnl_expr_quota_parse,
205  .build = nftnl_expr_quota_build,
206  .snprintf = nftnl_expr_quota_snprintf,
207  .json_parse = nftnl_expr_quota_json_parse,
208 };