This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / netfilter / xt_DSCP.c

diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c
new file mode 100644 (file)
index 0000000..a7cc75a
--- /dev/null
+++ b/net/netfilter/xt_DSCP.c
@@ -0,0 +1,118 @@
+/* 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)
+{
+       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)
+{
+       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 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_target[] = {
+       {
+               .name           = "DSCP",
+               .family         = AF_INET,
+               .checkentry     = checkentry,
+               .target         = target,
+               .targetsize     = sizeof(struct xt_DSCP_info),
+               .table          = "mangle",
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "DSCP",
+               .family         = AF_INET6,
+               .checkentry     = checkentry,
+               .target         = target6,
+               .targetsize     = sizeof(struct xt_DSCP_info),
+               .table          = "mangle",
+               .me             = THIS_MODULE,
+       },
+};
+
+static int __init xt_dscp_target_init(void)
+{
+       return xt_register_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
+}
+
+static void __exit xt_dscp_target_fini(void)
+{
+       xt_unregister_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
+}
+
+module_init(xt_dscp_target_init);
+module_exit(xt_dscp_target_fini);