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/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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>
struct nft_immediate_expr {
struct nft_data data;
enum nft_registers dreg:8;
u8 dlen;
};
static void nft_immediate_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
nft_data_copy(&data[priv->dreg], &priv->data);
}
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;
priv->dreg = ntohl(nla_get_be32(tb[NFTA_IMMEDIATE_DREG]));
err = nft_validate_output_register(priv->dreg);
if (err < 0)
return err;
err = nft_data_init(ctx, &priv->data, &desc, tb[NFTA_IMMEDIATE_DATA]);
if (err < 0)
return err;
priv->dlen = desc.len;
err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
desc.type, desc.len);
if (err < 0)
goto err1;
return 0;
err1:
nft_data_uninit(&priv->data, desc.type);
return err;
}
static void nft_immediate_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
return nft_data_uninit(&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 (nla_put_be32(skb, NFTA_IMMEDIATE_DREG, htonl(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 **data)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
if (priv->dreg == NFT_REG_VERDICT)
*data = &priv->data;
return 0;
}
static struct nft_expr_type nft_imm_type;
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,
.destroy = nft_immediate_destroy,
.dump = nft_immediate_dump,
.validate = nft_immediate_validate,
};
static 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,
};
int __init nft_immediate_module_init(void)
{
return nft_register_expr(&nft_imm_type);
}
void nft_immediate_module_exit(void)
{
nft_unregister_expr(&nft_imm_type);
}
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