// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#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/ipv6/nf_reject.h>

static void nft_reject_ipv6_eval(const struct nft_expr *expr,
                                 struct nft_regs *regs,
                                 const struct nft_pktinfo *pkt)
{
        struct nft_reject *priv = nft_expr_priv(expr);

        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;
        default:
                break;
        }

        regs->verdict.code = NF_DROP;
}

static struct nft_expr_type nft_reject_ipv6_type;
static const struct nft_expr_ops nft_reject_ipv6_ops = {
        .type           = &nft_reject_ipv6_type,
        .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
        .eval           = nft_reject_ipv6_eval,
        .init           = nft_reject_init,
        .dump           = nft_reject_dump,
        .validate       = nft_reject_validate,
        .reduce         = NFT_REDUCE_READONLY,
};

static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
        .family         = NFPROTO_IPV6,
        .name           = "reject",
        .ops            = &nft_reject_ipv6_ops,
        .policy         = nft_reject_policy,
        .maxattr        = NFTA_REJECT_MAX,
        .owner          = THIS_MODULE,
};

static int __init nft_reject_ipv6_module_init(void)
{
        return nft_register_expr(&nft_reject_ipv6_type);
}

static void __exit nft_reject_ipv6_module_exit(void)
{
        nft_unregister_expr(&nft_reject_ipv6_type);
}

module_init(nft_reject_ipv6_module_init);
module_exit(nft_reject_ipv6_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
MODULE_DESCRIPTION("IPv6 packet rejection for nftables");