[NETFILTER]: x_tables: replace IPv4 DSCP target by address family independent version

This replaces IPv4 DSCP target by address family independent version.
This also
	- utilizes dsfield.h to get/mangle DS field in IPv4/IPv6 header
	- fixes Kconfig help text.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 130 insertions, 0 deletions

diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c
new file mode 100644
index 000000000000..79df8165cd79
--- /dev/null
+++ b/net/netfilter/xt_DSCP.c
@@ -0,0 +1,130 @@
+/* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
+ *
+ * (C) 2002 by Harald Welte <laforge@netfilter.org>
+ * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
+ *
+ * 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.
+ *
+ * See RFC2474 for a description of the DSCP field within the IP Header.
+ *
+ * xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/dsfield.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_DSCP.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("x_tables DSCP modification module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_DSCP");
+MODULE_ALIAS("ip6t_DSCP");
+
+static unsigned int target(struct sk_buff **pskb,
+			   const struct net_device *in,
+			   const struct net_device *out,
+			   unsigned int hooknum,
+			   const struct xt_target *target,
+			   const void *targinfo,
+			   void *userinfo)
+{
+	const struct xt_DSCP_info *dinfo = targinfo;
+	u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT;
+
+	if (dscp != dinfo->dscp) {
+		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
+			return NF_DROP;
+
+		ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK),
+				    dinfo->dscp << XT_DSCP_SHIFT);
+
+	}
+	return XT_CONTINUE;
+}
+
+static unsigned int target6(struct sk_buff **pskb,
+			    const struct net_device *in,
+			    const struct net_device *out,
+			    unsigned int hooknum,
+			    const struct xt_target *target,
+			    const void *targinfo,
+			    void *userinfo)
+{
+	const struct xt_DSCP_info *dinfo = targinfo;
+	u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT;
+
+	if (dscp != dinfo->dscp) {
+		if (!skb_make_writable(pskb, sizeof(struct ipv6hdr)))
+			return NF_DROP;
+
+		ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK),
+				    dinfo->dscp << XT_DSCP_SHIFT);
+	}
+	return XT_CONTINUE;
+}
+
+static int checkentry(const char *tablename,
+		      const void *e_void,
+		      const struct xt_target *target,
+		      void *targinfo,
+		      unsigned int targinfosize,
+		      unsigned int hook_mask)
+{
+	const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
+
+	if ((dscp > XT_DSCP_MAX)) {
+		printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
+		return 0;
+	}
+	return 1;
+}
+
+static struct xt_target xt_dscp_reg = {
+	.name		= "DSCP",
+	.target		= target,
+	.targetsize	= sizeof(struct xt_DSCP_info),
+	.table		= "mangle",
+	.checkentry	= checkentry,
+	.family		= AF_INET,
+	.me		= THIS_MODULE,
+};
+
+static struct xt_target xt_dscp6_reg = {
+	.name		= "DSCP",
+	.target		= target6,
+	.targetsize	= sizeof(struct xt_DSCP_info),
+	.table		= "mangle",
+	.checkentry	= checkentry,
+	.family		= AF_INET6,
+	.me		= THIS_MODULE,
+};
+
+static int __init xt_dscp_target_init(void)
+{
+	int ret;
+	ret = xt_register_target(&xt_dscp_reg);
+	if (ret)
+		return ret;
+
+	ret = xt_register_target(&xt_dscp6_reg);
+	if (ret)
+		xt_unregister_target(&xt_dscp_reg);
+
+	return ret;
+}
+
+static void __exit xt_dscp_target_fini(void)
+{
+	xt_unregister_target(&xt_dscp_reg);
+	xt_unregister_target(&xt_dscp6_reg);
+}
+
+module_init(xt_dscp_target_init);
+module_exit(xt_dscp_target_fini);