Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / netfilter / ipt_REJECT.c

diff --git a/kernel/net/ipv4/netfilter/ipt_REJECT.c b/kernel/net/ipv4/netfilter/ipt_REJECT.c
new file mode 100644 (file)
index 0000000..87907d4
--- /dev/null
+++ b/kernel/net/ipv4/netfilter/ipt_REJECT.c
@@ -0,0 +1,113 @@
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#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 = par->hooknum;
+
+       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(skb, hook);
+       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("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("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);