tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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 version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 */
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/netlink.h>
15#include <linux/netfilter.h>
16#include <linux/netfilter/nf_tables.h>
17#include <net/netfilter/nf_tables_core.h>
18#include <net/netfilter/nf_tables.h>
19
20struct nft_immediate_expr {
21 struct nft_data data;
22 enum nft_registers dreg:8;
23 u8 dlen;
24};
25
26static void nft_immediate_eval(const struct nft_expr *expr,
27 struct nft_regs *regs,
28 const struct nft_pktinfo *pkt)
29{
30 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
31
32 nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen);
33}
34
35static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
36 [NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 },
37 [NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED },
38};
39
40static int nft_immediate_init(const struct nft_ctx *ctx,
41 const struct nft_expr *expr,
42 const struct nlattr * const tb[])
43{
44 struct nft_immediate_expr *priv = nft_expr_priv(expr);
45 struct nft_data_desc desc;
46 int err;
47
48 if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
49 tb[NFTA_IMMEDIATE_DATA] == NULL)
50 return -EINVAL;
51
52 err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
53 tb[NFTA_IMMEDIATE_DATA]);
54 if (err < 0)
55 return err;
56
57 priv->dlen = desc.len;
58
59 priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
60 err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
61 desc.type, desc.len);
62 if (err < 0)
63 goto err1;
64
65 return 0;
66
67err1:
68 nft_data_release(&priv->data, desc.type);
69 return err;
70}
71
72static void nft_immediate_destroy(const struct nft_ctx *ctx,
73 const struct nft_expr *expr)
74{
75 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
76
77 return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
78}
79
80static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
81{
82 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
83
84 if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
85 goto nla_put_failure;
86
87 return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
88 nft_dreg_to_type(priv->dreg), priv->dlen);
89
90nla_put_failure:
91 return -1;
92}
93
94static int nft_immediate_validate(const struct nft_ctx *ctx,
95 const struct nft_expr *expr,
96 const struct nft_data **data)
97{
98 const struct nft_immediate_expr *priv = nft_expr_priv(expr);
99
100 if (priv->dreg == NFT_REG_VERDICT)
101 *data = &priv->data;
102
103 return 0;
104}
105
106static const struct nft_expr_ops nft_imm_ops = {
107 .type = &nft_imm_type,
108 .size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
109 .eval = nft_immediate_eval,
110 .init = nft_immediate_init,
111 .destroy = nft_immediate_destroy,
112 .dump = nft_immediate_dump,
113 .validate = nft_immediate_validate,
114};
115
116struct nft_expr_type nft_imm_type __read_mostly = {
117 .name = "immediate",
118 .ops = &nft_imm_ops,
119 .policy = nft_immediate_policy,
120 .maxattr = NFTA_IMMEDIATE_MAX,
121 .owner = THIS_MODULE,
122};