libnftnl  1.2.8
obj/quota.c
1 /*
2  * (C) 2012-2016 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/object.h>
21 
22 #include "obj.h"
23 
24 static int nftnl_obj_quota_set(struct nftnl_obj *e, uint16_t type,
25  const void *data, uint32_t data_len)
26 {
27  struct nftnl_obj_quota *quota = nftnl_obj_data(e);
28 
29  switch (type) {
30  case NFTNL_OBJ_QUOTA_BYTES:
31  memcpy(&quota->bytes, data, data_len);
32  break;
33  case NFTNL_OBJ_QUOTA_CONSUMED:
34  memcpy(&quota->consumed, data, data_len);
35  break;
36  case NFTNL_OBJ_QUOTA_FLAGS:
37  memcpy(&quota->flags, data, data_len);
38  break;
39  }
40  return 0;
41 }
42 
43 static const void *nftnl_obj_quota_get(const struct nftnl_obj *e,
44  uint16_t type, uint32_t *data_len)
45 {
46  struct nftnl_obj_quota *quota = nftnl_obj_data(e);
47 
48  switch (type) {
49  case NFTNL_OBJ_QUOTA_BYTES:
50  *data_len = sizeof(quota->bytes);
51  return &quota->bytes;
52  case NFTNL_OBJ_QUOTA_CONSUMED:
53  *data_len = sizeof(quota->consumed);
54  return &quota->consumed;
55  case NFTNL_OBJ_QUOTA_FLAGS:
56  *data_len = sizeof(quota->flags);
57  return &quota->flags;
58  }
59  return NULL;
60 }
61 
62 static int nftnl_obj_quota_cb(const struct nlattr *attr, void *data)
63 {
64  int type = mnl_attr_get_type(attr);
65  const struct nlattr **tb = data;
66 
67  if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0)
68  return MNL_CB_OK;
69 
70  switch(type) {
71  case NFTA_QUOTA_BYTES:
72  case NFTA_QUOTA_CONSUMED:
73  if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
74  abi_breakage();
75  break;
76  case NFTA_QUOTA_FLAGS:
77  if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
78  abi_breakage();
79  break;
80  }
81 
82  tb[type] = attr;
83  return MNL_CB_OK;
84 }
85 
86 static void
87 nftnl_obj_quota_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
88 {
89  struct nftnl_obj_quota *quota = nftnl_obj_data(e);
90 
91  if (e->flags & (1 << NFTNL_OBJ_QUOTA_BYTES))
92  mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes));
93  if (e->flags & (1 << NFTNL_OBJ_QUOTA_CONSUMED))
94  mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED,
95  htobe64(quota->consumed));
96  if (e->flags & (1 << NFTNL_OBJ_QUOTA_FLAGS))
97  mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags));
98 }
99 
100 static int
101 nftnl_obj_quota_parse(struct nftnl_obj *e, struct nlattr *attr)
102 {
103  struct nftnl_obj_quota *quota = nftnl_obj_data(e);
104  struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {};
105 
106  if (mnl_attr_parse_nested(attr, nftnl_obj_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_OBJ_QUOTA_BYTES);
112  }
113  if (tb[NFTA_QUOTA_CONSUMED]) {
114  quota->consumed =
115  be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED]));
116  e->flags |= (1 << NFTNL_OBJ_QUOTA_CONSUMED);
117  }
118  if (tb[NFTA_QUOTA_FLAGS]) {
119  quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS]));
120  e->flags |= (1 << NFTNL_OBJ_QUOTA_FLAGS);
121  }
122 
123  return 0;
124 }
125 
126 static int nftnl_obj_quota_snprintf(char *buf, size_t len,
127  uint32_t flags,
128  const struct nftnl_obj *e)
129 {
130  struct nftnl_obj_quota *quota = nftnl_obj_data(e);
131 
132  return snprintf(buf, len, "bytes %"PRIu64" flags %u ",
133  quota->bytes, quota->flags);
134 }
135 
136 static struct attr_policy obj_quota_attr_policy[__NFTNL_OBJ_QUOTA_MAX] = {
137  [NFTNL_OBJ_QUOTA_BYTES] = { .maxlen = sizeof(uint64_t) },
138  [NFTNL_OBJ_QUOTA_CONSUMED] = { .maxlen = sizeof(uint64_t) },
139  [NFTNL_OBJ_QUOTA_FLAGS] = { .maxlen = sizeof(uint32_t) },
140 };
141 
142 struct obj_ops obj_ops_quota = {
143  .name = "quota",
144  .type = NFT_OBJECT_QUOTA,
145  .alloc_len = sizeof(struct nftnl_obj_quota),
146  .nftnl_max_attr = __NFTNL_OBJ_QUOTA_MAX - 1,
147  .attr_policy = obj_quota_attr_policy,
148  .set = nftnl_obj_quota_set,
149  .get = nftnl_obj_quota_get,
150  .parse = nftnl_obj_quota_parse,
151  .build = nftnl_obj_quota_build,
152  .output = nftnl_obj_quota_snprintf,
153 };