libnftnl 1.2.9
dup.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
4 */
5
6#include <stdio.h>
7#include <stdint.h>
8#include <string.h>
9#include <arpa/inet.h>
10#include <errno.h>
11#include "internal.h"
12#include <libmnl/libmnl.h>
13#include <linux/netfilter/nf_tables.h>
14#include <libnftnl/expr.h>
15#include <libnftnl/rule.h>
16#include "expr_ops.h"
17#include "data_reg.h"
18
20 enum nft_registers sreg_addr;
21 enum nft_registers sreg_dev;
22};
23
24static int nftnl_expr_dup_set(struct nftnl_expr *e, uint16_t type,
25 const void *data, uint32_t data_len)
26{
27 struct nftnl_expr_dup *dup = nftnl_expr_data(e);
28
29 switch (type) {
30 case NFTNL_EXPR_DUP_SREG_ADDR:
31 memcpy(&dup->sreg_addr, data, data_len);
32 break;
33 case NFTNL_EXPR_DUP_SREG_DEV:
34 memcpy(&dup->sreg_dev, data, data_len);
35 break;
36 }
37 return 0;
38}
39
40static const void *nftnl_expr_dup_get(const struct nftnl_expr *e,
41 uint16_t type, uint32_t *data_len)
42{
43 struct nftnl_expr_dup *dup = nftnl_expr_data(e);
44
45 switch (type) {
46 case NFTNL_EXPR_DUP_SREG_ADDR:
47 *data_len = sizeof(dup->sreg_addr);
48 return &dup->sreg_addr;
49 case NFTNL_EXPR_DUP_SREG_DEV:
50 *data_len = sizeof(dup->sreg_dev);
51 return &dup->sreg_dev;
52 }
53 return NULL;
54}
55
56static int nftnl_expr_dup_cb(const struct nlattr *attr, void *data)
57{
58 const struct nlattr **tb = data;
59 int type = mnl_attr_get_type(attr);
60
61 if (mnl_attr_type_valid(attr, NFTA_DUP_MAX) < 0)
62 return MNL_CB_OK;
63
64 switch (type) {
65 case NFTA_DUP_SREG_ADDR:
66 case NFTA_DUP_SREG_DEV:
67 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
68 abi_breakage();
69 break;
70 }
71
72 tb[type] = attr;
73 return MNL_CB_OK;
74}
75
76static void nftnl_expr_dup_build(struct nlmsghdr *nlh,
77 const struct nftnl_expr *e)
78{
79 struct nftnl_expr_dup *dup = nftnl_expr_data(e);
80
81 if (e->flags & (1 << NFTNL_EXPR_DUP_SREG_ADDR))
82 mnl_attr_put_u32(nlh, NFTA_DUP_SREG_ADDR, htonl(dup->sreg_addr));
83 if (e->flags & (1 << NFTNL_EXPR_DUP_SREG_DEV))
84 mnl_attr_put_u32(nlh, NFTA_DUP_SREG_DEV, htonl(dup->sreg_dev));
85}
86
87static int nftnl_expr_dup_parse(struct nftnl_expr *e, struct nlattr *attr)
88{
89 struct nftnl_expr_dup *dup = nftnl_expr_data(e);
90 struct nlattr *tb[NFTA_DUP_MAX + 1] = {};
91 int ret = 0;
92
93 if (mnl_attr_parse_nested(attr, nftnl_expr_dup_cb, tb) < 0)
94 return -1;
95
96 if (tb[NFTA_DUP_SREG_ADDR]) {
97 dup->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_DUP_SREG_ADDR]));
98 e->flags |= (1 << NFTNL_EXPR_DUP_SREG_ADDR);
99 }
100 if (tb[NFTA_DUP_SREG_DEV]) {
101 dup->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_DUP_SREG_DEV]));
102 e->flags |= (1 << NFTNL_EXPR_DUP_SREG_DEV);
103 }
104
105 return ret;
106}
107
108static int nftnl_expr_dup_snprintf(char *buf, size_t remain,
109 uint32_t flags, const struct nftnl_expr *e)
110{
111 struct nftnl_expr_dup *dup = nftnl_expr_data(e);
112 int offset = 0, ret;
113
114 if (e->flags & (1 << NFTNL_EXPR_DUP_SREG_ADDR)) {
115 ret = snprintf(buf + offset, remain, "sreg_addr %u ", dup->sreg_addr);
116 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
117 }
118
119 if (e->flags & (1 << NFTNL_EXPR_DUP_SREG_DEV)) {
120 ret = snprintf(buf + offset, remain, "sreg_dev %u ", dup->sreg_dev);
121 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
122 }
123
124 return offset;
125}
126
127static struct attr_policy dup_attr_policy[__NFTNL_EXPR_DUP_MAX] = {
128 [NFTNL_EXPR_DUP_SREG_ADDR] = { .maxlen = sizeof(uint32_t) },
129 [NFTNL_EXPR_DUP_SREG_DEV] = { .maxlen = sizeof(uint32_t) },
130};
131
132struct expr_ops expr_ops_dup = {
133 .name = "dup",
134 .alloc_len = sizeof(struct nftnl_expr_dup),
135 .nftnl_max_attr = __NFTNL_EXPR_DUP_MAX - 1,
136 .attr_policy = dup_attr_policy,
137 .set = nftnl_expr_dup_set,
138 .get = nftnl_expr_dup_get,
139 .parse = nftnl_expr_dup_parse,
140 .build = nftnl_expr_dup_build,
141 .output = nftnl_expr_dup_snprintf,
142};