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..26c7f4a
--- /dev/null
+++ b/net/netfilter/xt_dscp.c
@@ -0,0 +1,103 @@
+/* IP tables module for matching the value of the IPv4/IPv6 DSCP field
+ *
+ * xt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp
+ *
+ * (C) 2002 by Harald Welte <laforge@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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/dsfield.h>
+
+#include <linux/netfilter/xt_dscp.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("x_tables DSCP matching module");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_dscp");
+MODULE_ALIAS("ip6t_dscp");
+
+static int match(const struct sk_buff *skb,
+                const struct net_device *in,
+                const struct net_device *out,
+                const struct xt_match *match,
+                const void *matchinfo,
+                int offset,
+                unsigned int protoff,
+                int *hotdrop)
+{
+       const struct xt_dscp_info *info = matchinfo;
+       u_int8_t dscp = ipv4_get_dsfield(skb->nh.iph) >> XT_DSCP_SHIFT;
+
+       return (dscp == info->dscp) ^ !!info->invert;
+}
+
+static int match6(const struct sk_buff *skb,
+                 const struct net_device *in,
+                 const struct net_device *out,
+                 const struct xt_match *match,
+                 const void *matchinfo,
+                 int offset,
+                 unsigned int protoff,
+                 int *hotdrop)
+{
+       const struct xt_dscp_info *info = matchinfo;
+       u_int8_t dscp = ipv6_get_dsfield(skb->nh.ipv6h) >> XT_DSCP_SHIFT;
+
+       return (dscp == info->dscp) ^ !!info->invert;
+}
+
+static int checkentry(const char *tablename,
+                     const void *info,
+                     const struct xt_match *match,
+                     void *matchinfo,
+                     unsigned int hook_mask)
+{
+       const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp;
+
+       if (dscp > XT_DSCP_MAX) {
+               printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp);
+               return 0;
+       }
+
+       return 1;
+}
+
+static struct xt_match xt_dscp_match[] = {
+       {
+               .name           = "dscp",
+               .family         = AF_INET,
+               .checkentry     = checkentry,
+               .match          = match,
+               .matchsize      = sizeof(struct xt_dscp_info),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "dscp",
+               .family         = AF_INET6,
+               .checkentry     = checkentry,
+               .match          = match6,
+               .matchsize      = sizeof(struct xt_dscp_info),
+               .me             = THIS_MODULE,
+       },
+};
+
+static int __init xt_dscp_match_init(void)
+{
+       return xt_register_matches(xt_dscp_match, ARRAY_SIZE(xt_dscp_match));
+}
+
+static void __exit xt_dscp_match_fini(void)
+{
+       xt_unregister_matches(xt_dscp_match, ARRAY_SIZE(xt_dscp_match));
+}
+
+module_init(xt_dscp_match_init);
+module_exit(xt_dscp_match_fini);