// SPDX-License-Identifier: GPL-2.0-only
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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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#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/ipv4/nf_dup_ipv4.h>
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struct nft_dup_ipv4 {
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u8 sreg_addr;
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u8 sreg_dev;
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};
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static void nft_dup_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_dup_ipv4 *priv = nft_expr_priv(expr);
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struct in_addr gw = {
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.s_addr = (__force __be32)regs->data[priv->sreg_addr],
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};
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int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
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nf_dup_ipv4(nft_net(pkt), pkt->skb, nft_hook(pkt), &gw, oif);
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}
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static int nft_dup_ipv4_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_dup_ipv4 *priv = nft_expr_priv(expr);
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int err;
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if (tb[NFTA_DUP_SREG_ADDR] == NULL)
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return -EINVAL;
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err = nft_parse_register_load(tb[NFTA_DUP_SREG_ADDR], &priv->sreg_addr,
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sizeof(struct in_addr));
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if (err < 0)
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return err;
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if (tb[NFTA_DUP_SREG_DEV])
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err = nft_parse_register_load(tb[NFTA_DUP_SREG_DEV],
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&priv->sreg_dev, sizeof(int));
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return err;
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}
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static int nft_dup_ipv4_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
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goto nla_put_failure;
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if (priv->sreg_dev &&
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nft_dump_register(skb, NFTA_DUP_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_dup_ipv4_type;
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static const struct nft_expr_ops nft_dup_ipv4_ops = {
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.type = &nft_dup_ipv4_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv4)),
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.eval = nft_dup_ipv4_eval,
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.init = nft_dup_ipv4_init,
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.dump = nft_dup_ipv4_dump,
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};
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static const struct nla_policy nft_dup_ipv4_policy[NFTA_DUP_MAX + 1] = {
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[NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
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[NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
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};
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static struct nft_expr_type nft_dup_ipv4_type __read_mostly = {
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.family = NFPROTO_IPV4,
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.name = "dup",
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.ops = &nft_dup_ipv4_ops,
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.policy = nft_dup_ipv4_policy,
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.maxattr = NFTA_DUP_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_dup_ipv4_module_init(void)
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{
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return nft_register_expr(&nft_dup_ipv4_type);
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}
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static void __exit nft_dup_ipv4_module_exit(void)
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{
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nft_unregister_expr(&nft_dup_ipv4_type);
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}
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module_init(nft_dup_ipv4_module_init);
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module_exit(nft_dup_ipv4_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(AF_INET, "dup");
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MODULE_DESCRIPTION("IPv4 nftables packet duplication support");
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