Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
new file mode 100644
index 000000000..4b8840734
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * This is a module which is used for rejecting packets.
+ */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
+#include <net/icmp.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_REJECT.h>
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+#include <linux/netfilter_bridge.h>
+#endif
+
+#include <net/netfilter/ipv4/nf_reject.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: packet \"rejection\" target for IPv4");
+
+static unsigned int
+reject_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct ipt_reject_info *reject = par->targinfo;
+	int hook = xt_hooknum(par);
+
+	switch (reject->with) {
+	case IPT_ICMP_NET_UNREACHABLE:
+		nf_send_unreach(skb, ICMP_NET_UNREACH, hook);
+		break;
+	case IPT_ICMP_HOST_UNREACHABLE:
+		nf_send_unreach(skb, ICMP_HOST_UNREACH, hook);
+		break;
+	case IPT_ICMP_PROT_UNREACHABLE:
+		nf_send_unreach(skb, ICMP_PROT_UNREACH, hook);
+		break;
+	case IPT_ICMP_PORT_UNREACHABLE:
+		nf_send_unreach(skb, ICMP_PORT_UNREACH, hook);
+		break;
+	case IPT_ICMP_NET_PROHIBITED:
+		nf_send_unreach(skb, ICMP_NET_ANO, hook);
+		break;
+	case IPT_ICMP_HOST_PROHIBITED:
+		nf_send_unreach(skb, ICMP_HOST_ANO, hook);
+		break;
+	case IPT_ICMP_ADMIN_PROHIBITED:
+		nf_send_unreach(skb, ICMP_PKT_FILTERED, hook);
+		break;
+	case IPT_TCP_RESET:
+		nf_send_reset(xt_net(par), par->state->sk, skb, hook);
+		break;
+	case IPT_ICMP_ECHOREPLY:
+		/* Doesn't happen. */
+		break;
+	}
+
+	return NF_DROP;
+}
+
+static int reject_tg_check(const struct xt_tgchk_param *par)
+{
+	const struct ipt_reject_info *rejinfo = par->targinfo;
+	const struct ipt_entry *e = par->entryinfo;
+
+	if (rejinfo->with == IPT_ICMP_ECHOREPLY) {
+		pr_info_ratelimited("ECHOREPLY no longer supported.\n");
+		return -EINVAL;
+	} else if (rejinfo->with == IPT_TCP_RESET) {
+		/* Must specify that it's a TCP packet */
+		if (e->ip.proto != IPPROTO_TCP ||
+		    (e->ip.invflags & XT_INV_PROTO)) {
+			pr_info_ratelimited("TCP_RESET invalid for non-tcp\n");
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+static struct xt_target reject_tg_reg __read_mostly = {
+	.name		= "REJECT",
+	.family		= NFPROTO_IPV4,
+	.target		= reject_tg,
+	.targetsize	= sizeof(struct ipt_reject_info),
+	.table		= "filter",
+	.hooks		= (1 << NF_INET_LOCAL_IN) | (1 << NF_INET_FORWARD) |
+			  (1 << NF_INET_LOCAL_OUT),
+	.checkentry	= reject_tg_check,
+	.me		= THIS_MODULE,
+};
+
+static int __init reject_tg_init(void)
+{
+	return xt_register_target(&reject_tg_reg);
+}
+
+static void __exit reject_tg_exit(void)
+{
+	xt_unregister_target(&reject_tg_reg);
+}
+
+module_init(reject_tg_init);
+module_exit(reject_tg_exit);