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![Patrick McHardy](/assets/img/avatar_default.png)
Add a size argument to nft_data_init() and pass in the available space. This will be used by the following patches to support variable sized set element data. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_tables.h>
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struct nft_immediate_expr {
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struct nft_data data;
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enum nft_registers dreg:8;
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u8 dlen;
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};
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static void nft_immediate_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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nft_data_copy(®s->data[priv->dreg], &priv->data, priv->dlen);
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}
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static const struct nla_policy nft_immediate_policy[NFTA_IMMEDIATE_MAX + 1] = {
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[NFTA_IMMEDIATE_DREG] = { .type = NLA_U32 },
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[NFTA_IMMEDIATE_DATA] = { .type = NLA_NESTED },
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};
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static int nft_immediate_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_immediate_expr *priv = nft_expr_priv(expr);
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struct nft_data_desc desc;
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int err;
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if (tb[NFTA_IMMEDIATE_DREG] == NULL ||
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tb[NFTA_IMMEDIATE_DATA] == NULL)
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return -EINVAL;
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err = nft_data_init(ctx, &priv->data, sizeof(priv->data), &desc,
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tb[NFTA_IMMEDIATE_DATA]);
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if (err < 0)
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return err;
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priv->dlen = desc.len;
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priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
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err = nft_validate_register_store(ctx, priv->dreg, &priv->data,
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desc.type, desc.len);
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if (err < 0)
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goto err1;
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return 0;
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err1:
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nft_data_uninit(&priv->data, desc.type);
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return err;
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}
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static void nft_immediate_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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return nft_data_uninit(&priv->data, nft_dreg_to_type(priv->dreg));
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}
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static int nft_immediate_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_IMMEDIATE_DREG, priv->dreg))
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goto nla_put_failure;
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return nft_data_dump(skb, NFTA_IMMEDIATE_DATA, &priv->data,
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nft_dreg_to_type(priv->dreg), priv->dlen);
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nla_put_failure:
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return -1;
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}
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static int nft_immediate_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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const struct nft_immediate_expr *priv = nft_expr_priv(expr);
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if (priv->dreg == NFT_REG_VERDICT)
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*data = &priv->data;
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return 0;
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}
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static struct nft_expr_type nft_imm_type;
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static const struct nft_expr_ops nft_imm_ops = {
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.type = &nft_imm_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_immediate_expr)),
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.eval = nft_immediate_eval,
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.init = nft_immediate_init,
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.destroy = nft_immediate_destroy,
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.dump = nft_immediate_dump,
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.validate = nft_immediate_validate,
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};
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static struct nft_expr_type nft_imm_type __read_mostly = {
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.name = "immediate",
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.ops = &nft_imm_ops,
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.policy = nft_immediate_policy,
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.maxattr = NFTA_IMMEDIATE_MAX,
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.owner = THIS_MODULE,
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};
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int __init nft_immediate_module_init(void)
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{
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return nft_register_expr(&nft_imm_type);
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}
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void nft_immediate_module_exit(void)
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{
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nft_unregister_expr(&nft_imm_type);
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}
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