6aa187f21c
- Add nft_pktinfo.pf to replace ops->pf - Add nft_pktinfo.hook to replace ops->hooknum This simplifies the code, makes it more readable, and likely reduces cache line misses. Maintainability is enhanced as the details of nft_hook_ops are of no concern to the recpients of nft_pktinfo. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
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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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#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.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_redirect.h>
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#include <net/netfilter/nft_redir.h>
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static void nft_redir_ipv4_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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struct nft_redir *priv = nft_expr_priv(expr);
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struct nf_nat_ipv4_multi_range_compat mr;
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memset(&mr, 0, sizeof(mr));
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if (priv->sreg_proto_min) {
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mr.range[0].min.all =
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*(__be16 *)®s->data[priv->sreg_proto_min];
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mr.range[0].max.all =
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*(__be16 *)®s->data[priv->sreg_proto_max];
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mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
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}
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mr.range[0].flags |= priv->flags;
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regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr,
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pkt->hook);
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}
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static struct nft_expr_type nft_redir_ipv4_type;
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static const struct nft_expr_ops nft_redir_ipv4_ops = {
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.type = &nft_redir_ipv4_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
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.eval = nft_redir_ipv4_eval,
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.init = nft_redir_init,
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.dump = nft_redir_dump,
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.validate = nft_redir_validate,
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};
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static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
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.family = NFPROTO_IPV4,
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.name = "redir",
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.ops = &nft_redir_ipv4_ops,
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.policy = nft_redir_policy,
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.maxattr = NFTA_REDIR_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_redir_ipv4_module_init(void)
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{
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return nft_register_expr(&nft_redir_ipv4_type);
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}
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static void __exit nft_redir_ipv4_module_exit(void)
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{
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nft_unregister_expr(&nft_redir_ipv4_type);
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}
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module_init(nft_redir_ipv4_module_init);
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module_exit(nft_redir_ipv4_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
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MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir");
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