ef1f7df917
Split the expression ops into two parts and support overloading of the runtime expression ops based on the requested function through a ->select_ops() callback. This can be used to provide optimized implementations, for instance for loading small aligned amounts of data from the packet or inlining frequently used operations into the main evaluation loop. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
95 lines
2.3 KiB
C
95 lines
2.3 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/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.h>
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struct nft_template {
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};
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static void nft_template_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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struct nft_template *priv = nft_expr_priv(expr);
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}
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static const struct nla_policy nft_template_policy[NFTA_TEMPLATE_MAX + 1] = {
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[NFTA_TEMPLATE_ATTR] = { .type = NLA_U32 },
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};
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static int nft_template_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_template *priv = nft_expr_priv(expr);
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return 0;
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}
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static void nft_template_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_template *priv = nft_expr_priv(expr);
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}
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static int nft_template_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_template *priv = nft_expr_priv(expr);
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NLA_PUT_BE32(skb, NFTA_TEMPLATE_ATTR, priv->field);
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_template_type;
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static const struct nft_expr_ops nft_template_ops = {
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.type = &nft_template_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_template)),
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.eval = nft_template_eval,
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.init = nft_template_init,
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.destroy = nft_template_destroy,
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.dump = nft_template_dump,
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};
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static struct nft_expr_type nft_template_type __read_mostly = {
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.name = "template",
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.ops = &nft_template_ops,
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.policy = nft_template_policy,
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.maxattr = NFTA_TEMPLATE_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_template_module_init(void)
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{
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return nft_register_expr(&nft_template_type);
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}
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static void __exit nft_template_module_exit(void)
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{
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nft_unregister_expr(&nft_template_type);
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}
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module_init(nft_template_module_init);
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module_exit(nft_template_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_EXPR("template");
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