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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014 Patrick McHardy <kaber@trash.net>
*/
#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/nft_reject.h>
#include <net/netfilter/ipv4/nf_reject.h>
#include <net/netfilter/ipv6/nf_reject.h>
static void nft_reject_inet_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_reject *priv = nft_expr_priv(expr);
switch (nft_pf(pkt)) {
case NFPROTO_IPV4:
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
nf_send_unreach(pkt->skb, priv->icmp_code,
nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset(nft_net(pkt), nft_sk(pkt),
pkt->skb, nft_hook(pkt));
break;
case NFT_REJECT_ICMPX_UNREACH:
nf_send_unreach(pkt->skb,
nft_reject_icmp_code(priv->icmp_code),
nft_hook(pkt));
break;
}
break;
case NFPROTO_IPV6:
switch (priv->type) {
case NFT_REJECT_ICMP_UNREACH:
nf_send_unreach6(nft_net(pkt), pkt->skb,
priv->icmp_code, nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset6(nft_net(pkt), nft_sk(pkt),
pkt->skb, nft_hook(pkt));
break;
case NFT_REJECT_ICMPX_UNREACH:
nf_send_unreach6(nft_net(pkt), pkt->skb,
nft_reject_icmpv6_code(priv->icmp_code),
nft_hook(pkt));
break;
}
break;
}
regs->verdict.code = NF_DROP;
}
static int nft_reject_inet_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
return nft_chain_validate_hooks(ctx->chain,
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_INGRESS));
}
static struct nft_expr_type nft_reject_inet_type;
static const struct nft_expr_ops nft_reject_inet_ops = {
.type = &nft_reject_inet_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
.eval = nft_reject_inet_eval,
.init = nft_reject_init,
.dump = nft_reject_dump,
.validate = nft_reject_inet_validate,
};
static struct nft_expr_type nft_reject_inet_type __read_mostly = {
.family = NFPROTO_INET,
.name = "reject",
.ops = &nft_reject_inet_ops,
.policy = nft_reject_policy,
.maxattr = NFTA_REJECT_MAX,
.owner = THIS_MODULE,
};
static int __init nft_reject_inet_module_init(void)
{
return nft_register_expr(&nft_reject_inet_type);
}
static void __exit nft_reject_inet_module_exit(void)
{
nft_unregister_expr(&nft_reject_inet_type);
}
module_init(nft_reject_inet_module_init);
module_exit(nft_reject_inet_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_AF_EXPR(1, "reject");
MODULE_DESCRIPTION("Netfilter nftables reject inet support");
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