// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IP6 tables REJECT target module
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* Linux INET6 implementation
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*
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* Copyright (C)2003 USAGI/WIDE Project
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*
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* Authors:
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* Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
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*
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* Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net>
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*
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* Based on net/ipv4/netfilter/ipt_REJECT.c
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/icmpv6.h>
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#include <linux/netdevice.h>
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#include <net/icmp.h>
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#include <net/flow.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_REJECT.h>
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#include <net/netfilter/ipv6/nf_reject.h>
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MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
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MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
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MODULE_LICENSE("GPL");
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static unsigned int
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reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
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{
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const struct ip6t_reject_info *reject = par->targinfo;
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struct net *net = xt_net(par);
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switch (reject->with) {
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case IP6T_ICMP6_NO_ROUTE:
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nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par));
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break;
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case IP6T_ICMP6_ADM_PROHIBITED:
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nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED,
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xt_hooknum(par));
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break;
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case IP6T_ICMP6_NOT_NEIGHBOUR:
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nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR,
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xt_hooknum(par));
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break;
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case IP6T_ICMP6_ADDR_UNREACH:
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nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH,
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xt_hooknum(par));
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break;
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case IP6T_ICMP6_PORT_UNREACH:
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nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH,
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xt_hooknum(par));
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break;
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case IP6T_ICMP6_ECHOREPLY:
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/* Do nothing */
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break;
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case IP6T_TCP_RESET:
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nf_send_reset6(net, skb, xt_hooknum(par));
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break;
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case IP6T_ICMP6_POLICY_FAIL:
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nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par));
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break;
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case IP6T_ICMP6_REJECT_ROUTE:
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nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE,
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xt_hooknum(par));
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break;
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}
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return NF_DROP;
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}
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static int reject_tg6_check(const struct xt_tgchk_param *par)
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{
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const struct ip6t_reject_info *rejinfo = par->targinfo;
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const struct ip6t_entry *e = par->entryinfo;
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if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
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pr_info_ratelimited("ECHOREPLY is not supported\n");
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return -EINVAL;
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} else if (rejinfo->with == IP6T_TCP_RESET) {
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/* Must specify that it's a TCP packet */
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if (!(e->ipv6.flags & IP6T_F_PROTO) ||
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e->ipv6.proto != IPPROTO_TCP ||
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(e->ipv6.invflags & XT_INV_PROTO)) {
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pr_info_ratelimited("TCP_RESET illegal for non-tcp\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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static struct xt_target reject_tg6_reg __read_mostly = {
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.name = "REJECT",
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.family = NFPROTO_IPV6,
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.target = reject_tg6,
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.targetsize = sizeof(struct ip6t_reject_info),
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.table = "filter",
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.hooks = (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
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(1 << NF_INET_LOCAL_OUT),
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.checkentry = reject_tg6_check,
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.me = THIS_MODULE
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};
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static int __init reject_tg6_init(void)
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{
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return xt_register_target(&reject_tg6_reg);
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}
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static void __exit reject_tg6_exit(void)
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{
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xt_unregister_target(&reject_tg6_reg);
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}
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module_init(reject_tg6_init);
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module_exit(reject_tg6_exit);
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