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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/netlink.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter/nf_tables.h>
- #include <net/netfilter/nf_tables.h>
- #include <net/netfilter/ipv4/nf_dup_ipv4.h>
- struct nft_dup_ipv4 {
- enum nft_registers sreg_addr:8;
- enum nft_registers sreg_dev:8;
- };
- static void nft_dup_ipv4_eval(const struct nft_expr *expr,
- struct nft_regs *regs,
- const struct nft_pktinfo *pkt)
- {
- struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
- struct in_addr gw = {
- .s_addr = (__force __be32)regs->data[priv->sreg_addr],
- };
- int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
- nf_dup_ipv4(nft_net(pkt), pkt->skb, nft_hook(pkt), &gw, oif);
- }
- static int nft_dup_ipv4_init(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nlattr * const tb[])
- {
- struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
- int err;
- if (tb[NFTA_DUP_SREG_ADDR] == NULL)
- return -EINVAL;
- priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
- err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in_addr));
- if (err < 0)
- return err;
- if (tb[NFTA_DUP_SREG_DEV] != NULL) {
- priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
- return nft_validate_register_load(priv->sreg_dev, sizeof(int));
- }
- return 0;
- }
- static int nft_dup_ipv4_dump(struct sk_buff *skb, const struct nft_expr *expr)
- {
- struct nft_dup_ipv4 *priv = nft_expr_priv(expr);
- if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
- goto nla_put_failure;
- if (priv->sreg_dev &&
- nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static struct nft_expr_type nft_dup_ipv4_type;
- static const struct nft_expr_ops nft_dup_ipv4_ops = {
- .type = &nft_dup_ipv4_type,
- .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv4)),
- .eval = nft_dup_ipv4_eval,
- .init = nft_dup_ipv4_init,
- .dump = nft_dup_ipv4_dump,
- };
- static const struct nla_policy nft_dup_ipv4_policy[NFTA_DUP_MAX + 1] = {
- [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
- [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
- };
- static struct nft_expr_type nft_dup_ipv4_type __read_mostly = {
- .family = NFPROTO_IPV4,
- .name = "dup",
- .ops = &nft_dup_ipv4_ops,
- .policy = nft_dup_ipv4_policy,
- .maxattr = NFTA_DUP_MAX,
- .owner = THIS_MODULE,
- };
- static int __init nft_dup_ipv4_module_init(void)
- {
- return nft_register_expr(&nft_dup_ipv4_type);
- }
- static void __exit nft_dup_ipv4_module_exit(void)
- {
- nft_unregister_expr(&nft_dup_ipv4_type);
- }
- module_init(nft_dup_ipv4_module_init);
- module_exit(nft_dup_ipv4_module_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
- MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "dup");
- MODULE_DESCRIPTION("IPv4 nftables packet duplication support");
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