1 files changed, 121 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
new file mode 100644
index 000000000..a35019d2e
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * IP6 tables REJECT target module
+ * Linux INET6 implementation
+ *
+ * Copyright (C)2003 USAGI/WIDE Project
+ *
+ * Authors:
+ *	Yasuyuki Kozakai	<yasuyuki.kozakai@toshiba.co.jp>
+ *
+ * Copyright (c) 2005-2007 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on net/ipv4/netfilter/ipt_REJECT.c
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/icmpv6.h>
+#include <linux/netdevice.h>
+#include <net/icmp.h>
+#include <net/flow.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_REJECT.h>
+
+#include <net/netfilter/ipv6/nf_reject.h>
+
+MODULE_AUTHOR("Yasuyuki KOZAKAI <yasuyuki.kozakai@toshiba.co.jp>");
+MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv6");
+MODULE_LICENSE("GPL");
+
+static unsigned int
+reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct ip6t_reject_info *reject = par->targinfo;
+	struct net *net = xt_net(par);
+
+	switch (reject->with) {
+	case IP6T_ICMP6_NO_ROUTE:
+		nf_send_unreach6(net, skb, ICMPV6_NOROUTE, xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_ADM_PROHIBITED:
+		nf_send_unreach6(net, skb, ICMPV6_ADM_PROHIBITED,
+				 xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_NOT_NEIGHBOUR:
+		nf_send_unreach6(net, skb, ICMPV6_NOT_NEIGHBOUR,
+				 xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_ADDR_UNREACH:
+		nf_send_unreach6(net, skb, ICMPV6_ADDR_UNREACH,
+				 xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_PORT_UNREACH:
+		nf_send_unreach6(net, skb, ICMPV6_PORT_UNREACH,
+				 xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_ECHOREPLY:
+		/* Do nothing */
+		break;
+	case IP6T_TCP_RESET:
+		nf_send_reset6(net, par->state->sk, skb, xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_POLICY_FAIL:
+		nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par));
+		break;
+	case IP6T_ICMP6_REJECT_ROUTE:
+		nf_send_unreach6(net, skb, ICMPV6_REJECT_ROUTE,
+				 xt_hooknum(par));
+		break;
+	}
+
+	return NF_DROP;
+}
+
+static int reject_tg6_check(const struct xt_tgchk_param *par)
+{
+	const struct ip6t_reject_info *rejinfo = par->targinfo;
+	const struct ip6t_entry *e = par->entryinfo;
+
+	if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
+		pr_info_ratelimited("ECHOREPLY is not supported\n");
+		return -EINVAL;
+	} else if (rejinfo->with == IP6T_TCP_RESET) {
+		/* Must specify that it's a TCP packet */
+		if (!(e->ipv6.flags & IP6T_F_PROTO) ||
+		    e->ipv6.proto != IPPROTO_TCP ||
+		    (e->ipv6.invflags & XT_INV_PROTO)) {
+			pr_info_ratelimited("TCP_RESET illegal for non-tcp\n");
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+static struct xt_target reject_tg6_reg __read_mostly = {
+	.name		= "REJECT",
+	.family		= NFPROTO_IPV6,
+	.target		= reject_tg6,
+	.targetsize	= sizeof(struct ip6t_reject_info),
+	.table		= "filter",
+	.hooks		= (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
+			  (1 << NF_INET_LOCAL_OUT),
+	.checkentry	= reject_tg6_check,
+	.me		= THIS_MODULE
+};
+
+static int __init reject_tg6_init(void)
+{
+	return xt_register_target(&reject_tg6_reg);
+}
+
+static void __exit reject_tg6_exit(void)
+{
+	xt_unregister_target(&reject_tg6_reg);
+}
+
+module_init(reject_tg6_init);
+module_exit(reject_tg6_exit);