summaryrefslogtreecommitdiff
path: root/net/netfilter/nft_immediate.c
blob: cb8547f97220fb020c4340ffabc91e46600e0127 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>

void nft_immediate_eval(const struct nft_expr *expr,
			struct nft_regs *regs,
			const struct nft_pktinfo *pkt)
{
	const struct nft_immediate_expr *priv = nft_expr_priv(expr);

	nft_data_copy(&regs->data[priv->dreg], &priv->data, priv->dlen);
}

static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
	[NFTA_IMMEDIATE_DREG]	= { .type = NLA_U32 },
	[NFTA_IMMEDIATE_DATA]	= { .type = NLA_NESTED },
};

static int nft_immediate_init(const struct nft_ctx *ctx,
			      const struct nft_expr *expr,
			      const struct nlattr * const tb[])
{
	struct nft_immediate_expr *priv = nft_expr_priv(expr);
	struct nft_data_desc desc;
	int err;

	if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
	    tb[NFTA_IMMEDIATE_DATA] == NULL)
		return -EINVAL;

	err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
			    tb[NFTA_IMMEDIATE_DATA]);
	if (err < 0)
		return err;

	priv->dlen = desc.len;

	priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
	err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
					  desc.type, desc.len);
	if (err < 0)
		goto err1;

	return 0;

err1:
	nft_data_release(&priv->data, desc.type);
	return err;
}

static void nft_immediate_activate(const struct nft_ctx *ctx,
				   const struct nft_expr *expr)
{
	const struct nft_immediate_expr *priv = nft_expr_priv(expr);

	return nft_data_hold(&priv->data, nft_dreg_to_type(priv->dreg));
}

static void nft_immediate_deactivate(const struct nft_ctx *ctx,
				     const struct nft_expr *expr,
				     enum nft_trans_phase phase)
{
	const struct nft_immediate_expr *priv = nft_expr_priv(expr);

	if (phase == NFT_TRANS_COMMIT)
		return;

	return nft_data_release(&priv->data, nft_dreg_to_type(priv->dreg));
}

static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_immediate_expr *priv = nft_expr_priv(expr);

	if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
		goto nla_put_failure;

	return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
			     nft_dreg_to_type(priv->dreg), priv->dlen);

nla_put_failure:
	return -1;
}

static int nft_immediate_validate(const struct nft_ctx *ctx,
				  const struct nft_expr *expr,
				  const struct nft_data **d)
{
	const struct nft_immediate_expr *priv = nft_expr_priv(expr);
	struct nft_ctx *pctx = (struct nft_ctx *)ctx;
	const struct nft_data *data;
	int err;

	if (priv->dreg != NFT_REG_VERDICT)
		return 0;

	data = &priv->data;

	switch (data->verdict.code) {
	case NFT_JUMP:
	case NFT_GOTO:
		pctx->level++;
		err = nft_chain_validate(ctx, data->verdict.chain);
		if (err < 0)
			return err;
		pctx->level--;
		break;
	default:
		break;
	}

	return 0;
}

static const struct nft_expr_ops nft_imm_ops = {
	.type		= &nft_imm_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
	.eval		= nft_immediate_eval,
	.init		= nft_immediate_init,
	.activate	= nft_immediate_activate,
	.deactivate	= nft_immediate_deactivate,
	.dump		= nft_immediate_dump,
	.validate	= nft_immediate_validate,
};

struct nft_expr_type nft_imm_type __read_mostly = {
	.name		= "immediate",
	.ops		= &nft_imm_ops,
	.policy		= nft_immediate_policy,
	.maxattr	= NFTA_IMMEDIATE_MAX,
	.owner		= THIS_MODULE,
};