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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/*
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* Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* 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_dup_netdev.h>
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struct nft_fwd_netdev {
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enum nft_registers sreg_dev:8;
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};
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static void nft_fwd_netdev_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_fwd_netdev *priv = nft_expr_priv(expr);
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int oif = regs->data[priv->sreg_dev];
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nf_dup_netdev_egress(pkt, oif);
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regs->verdict.code = NF_DROP;
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}
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static const struct nla_policy nft_fwd_netdev_policy[NFTA_FWD_MAX + 1] = {
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[NFTA_FWD_SREG_DEV] = { .type = NLA_U32 },
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};
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static int nft_fwd_netdev_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_fwd_netdev *priv = nft_expr_priv(expr);
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if (tb[NFTA_FWD_SREG_DEV] == NULL)
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return -EINVAL;
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priv->sreg_dev = nft_parse_register(tb[NFTA_FWD_SREG_DEV]);
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return nft_validate_register_load(priv->sreg_dev, sizeof(int));
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}
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static const struct nft_expr_ops nft_fwd_netdev_ingress_ops;
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static int nft_fwd_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_fwd_netdev *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_FWD_SREG_DEV, priv->sreg_dev))
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goto nla_put_failure;
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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_fwd_netdev_type;
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static const struct nft_expr_ops nft_fwd_netdev_ops = {
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.type = &nft_fwd_netdev_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_fwd_netdev)),
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.eval = nft_fwd_netdev_eval,
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.init = nft_fwd_netdev_init,
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.dump = nft_fwd_netdev_dump,
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};
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static struct nft_expr_type nft_fwd_netdev_type __read_mostly = {
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.family = NFPROTO_NETDEV,
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.name = "fwd",
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.ops = &nft_fwd_netdev_ops,
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.policy = nft_fwd_netdev_policy,
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.maxattr = NFTA_FWD_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_fwd_netdev_module_init(void)
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{
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return nft_register_expr(&nft_fwd_netdev_type);
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}
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static void __exit nft_fwd_netdev_module_exit(void)
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{
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nft_unregister_expr(&nft_fwd_netdev_type);
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}
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module_init(nft_fwd_netdev_module_init);
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module_exit(nft_fwd_netdev_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_AF_EXPR(5, "fwd");
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