libnftnl 1.2.9
gen.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012-2014 by Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5#include "internal.h"
6
7#include <time.h>
8#include <endian.h>
9#include <stdint.h>
10#include <limits.h>
11#include <stdlib.h>
12#include <string.h>
13#include <netinet/in.h>
14#include <errno.h>
15
16#include <libmnl/libmnl.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
19
20#include <libnftnl/gen.h>
21
22struct nftnl_gen {
23 uint32_t id;
24
25 uint32_t flags;
26};
27
28EXPORT_SYMBOL(nftnl_gen_alloc);
29struct nftnl_gen *nftnl_gen_alloc(void)
30{
31 return calloc(1, sizeof(struct nftnl_gen));
32}
33
34EXPORT_SYMBOL(nftnl_gen_free);
35void nftnl_gen_free(const struct nftnl_gen *gen)
36{
37 xfree(gen);
38}
39
40EXPORT_SYMBOL(nftnl_gen_is_set);
41bool nftnl_gen_is_set(const struct nftnl_gen *gen, uint16_t attr)
42{
43 return gen->flags & (1 << attr);
44}
45
46EXPORT_SYMBOL(nftnl_gen_unset);
47void nftnl_gen_unset(struct nftnl_gen *gen, uint16_t attr)
48{
49 if (!(gen->flags & (1 << attr)))
50 return;
51
52 switch (attr) {
53 case NFTNL_GEN_ID:
54 break;
55 }
56 gen->flags &= ~(1 << attr);
57}
58
59static uint32_t nftnl_gen_validate[NFTNL_GEN_MAX + 1] = {
60 [NFTNL_GEN_ID] = sizeof(uint32_t),
61};
62
63EXPORT_SYMBOL(nftnl_gen_set_data);
64int nftnl_gen_set_data(struct nftnl_gen *gen, uint16_t attr,
65 const void *data, uint32_t data_len)
66{
67 nftnl_assert_attr_exists(attr, NFTNL_GEN_MAX);
68 nftnl_assert_validate(data, nftnl_gen_validate, attr, data_len);
69
70 switch (attr) {
71 case NFTNL_GEN_ID:
72 memcpy(&gen->id, data, sizeof(gen->id));
73 break;
74 }
75 gen->flags |= (1 << attr);
76 return 0;
77}
78
79int nftnl_gen_set(struct nftnl_gen *gen, uint16_t attr, const void *data) __visible;
80int nftnl_gen_set(struct nftnl_gen *gen, uint16_t attr, const void *data)
81{
82 return nftnl_gen_set_data(gen, attr, data, nftnl_gen_validate[attr]);
83}
84
85EXPORT_SYMBOL(nftnl_gen_set_u32);
86void nftnl_gen_set_u32(struct nftnl_gen *gen, uint16_t attr, uint32_t val)
87{
88 nftnl_gen_set_data(gen, attr, &val, sizeof(uint32_t));
89}
90
91EXPORT_SYMBOL(nftnl_gen_get_data);
92const void *nftnl_gen_get_data(const struct nftnl_gen *gen, uint16_t attr,
93 uint32_t *data_len)
94{
95 if (!(gen->flags & (1 << attr)))
96 return NULL;
97
98 switch(attr) {
99 case NFTNL_GEN_ID:
100 *data_len = sizeof(gen->id);
101 return &gen->id;
102 }
103 return NULL;
104}
105
106EXPORT_SYMBOL(nftnl_gen_get);
107const void *nftnl_gen_get(const struct nftnl_gen *gen, uint16_t attr)
108{
109 uint32_t data_len;
110 return nftnl_gen_get_data(gen, attr, &data_len);
111}
112
113EXPORT_SYMBOL(nftnl_gen_get_u32);
114uint32_t nftnl_gen_get_u32(const struct nftnl_gen *gen, uint16_t attr)
115{
116 const void *ret = nftnl_gen_get(gen, attr);
117 return ret == NULL ? 0 : *((uint32_t *)ret);
118}
119
120static int nftnl_gen_parse_attr_cb(const struct nlattr *attr, void *data)
121{
122 const struct nlattr **tb = data;
123 int type = mnl_attr_get_type(attr);
124
125 if (mnl_attr_type_valid(attr, NFTA_GEN_MAX) < 0)
126 return MNL_CB_OK;
127
128 switch(type) {
129 case NFTA_GEN_ID:
130 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
131 abi_breakage();
132 break;
133 }
134
135 tb[type] = attr;
136 return MNL_CB_OK;
137}
138
139EXPORT_SYMBOL(nftnl_gen_nlmsg_parse);
140int nftnl_gen_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_gen *gen)
141{
142 struct nlattr *tb[NFTA_GEN_MAX + 1] = {};
143
144 if (mnl_attr_parse(nlh, sizeof(struct nfgenmsg),
145 nftnl_gen_parse_attr_cb, tb) < 0)
146 return -1;
147
148 if (tb[NFTA_GEN_ID]) {
149 gen->id = ntohl(mnl_attr_get_u32(tb[NFTA_GEN_ID]));
150 gen->flags |= (1 << NFTNL_GEN_ID);
151 }
152 return 0;
153}
154
155static int nftnl_gen_cmd_snprintf(char *buf, size_t remain,
156 const struct nftnl_gen *gen, uint32_t cmd,
157 uint32_t type, uint32_t flags)
158{
159 int ret, offset = 0;
160
161 if (type != NFTNL_OUTPUT_DEFAULT)
162 return -1;
163
164 ret = snprintf(buf, remain, "ruleset generation ID %u", gen->id);
165 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
166 return offset;
167}
168
169EXPORT_SYMBOL(nftnl_gen_snprintf);
170int nftnl_gen_snprintf(char *buf, size_t size, const struct nftnl_gen *gen,
171 uint32_t type, uint32_t flags)
172{
173 if (size)
174 buf[0] = '\0';
175
176 return nftnl_gen_cmd_snprintf(buf, size, gen, nftnl_flag2cmd(flags), type,
177 flags);
178}
179
180static int nftnl_gen_do_snprintf(char *buf, size_t size, const void *gen,
181 uint32_t cmd, uint32_t type, uint32_t flags)
182{
183 return nftnl_gen_snprintf(buf, size, gen, type, flags);
184}
185
186EXPORT_SYMBOL(nftnl_gen_fprintf);
187int nftnl_gen_fprintf(FILE *fp, const struct nftnl_gen *gen, uint32_t type,
188 uint32_t flags)
189{
190 return nftnl_fprintf(fp, gen, NFTNL_CMD_UNSPEC, type, flags,
191 nftnl_gen_do_snprintf);
192}