www.usr.com/support/gpl/USR9107_release.1.4.tar.gz

[bcm963xx.git] / kernel / linux / net / ipv4 / netfilter / ipt_dscp.c

diff --git a/kernel/linux/net/ipv4/netfilter/ipt_dscp.c b/kernel/linux/net/ipv4/netfilter/ipt_dscp.c
index 5df52a6..3ea4509 100755 (executable)
--- a/kernel/linux/net/ipv4/netfilter/ipt_dscp.c
+++ b/kernel/linux/net/ipv4/netfilter/ipt_dscp.c
@@ -1,62 +1,105 @@
-/* IP tables module for matching the value of the IPv4 DSCP field
- *
- * ipt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp
+/* iptables module for setting the IPv4 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
+ * 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.
+ *
+ * ipt_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 <net/checksum.h>
 
-#include <linux/netfilter_ipv4/ipt_dscp.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_DSCP.h>
 
 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("iptables DSCP matching module");
+MODULE_DESCRIPTION("iptables DSCP modification module");
 MODULE_LICENSE("GPL");
 
-static int match(const struct sk_buff *skb, const struct net_device *in,
-                const struct net_device *out, const void *matchinfo,
-                int offset, int *hotdrop)
+static unsigned int
+target(struct sk_buff **pskb,
+       const struct net_device *in,
+       const struct net_device *out,
+       unsigned int hooknum,
+       const void *targinfo,
+       void *userinfo)
 {
-       const struct ipt_dscp_info *info = matchinfo;
-       const struct iphdr *iph = skb->nh.iph;
+       const struct ipt_DSCP_info *dinfo = targinfo;
+       u_int8_t sh_dscp = ((dinfo->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
+
 
-       u_int8_t sh_dscp = ((info->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
+       if (((*pskb)->nh.iph->tos & IPT_DSCP_MASK) != sh_dscp) {
+               u_int16_t diffs[2];
 
-       return ((iph->tos&IPT_DSCP_MASK) == sh_dscp) ^ info->invert;
+               if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+                       return NF_DROP;
+
+               diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
+               (*pskb)->nh.iph->tos = ((*pskb)->nh.iph->tos & ~IPT_DSCP_MASK)
+                       | sh_dscp;
+               diffs[1] = htons((*pskb)->nh.iph->tos);
+               (*pskb)->nh.iph->check
+                       = csum_fold(csum_partial((char *)diffs,
+                                                sizeof(diffs),
+                                                (*pskb)->nh.iph->check
+                                                ^ 0xFFFF));
+               (*pskb)->nfcache |= NFC_ALTERED;
+       }
+       return IPT_CONTINUE;
 }
 
-static int checkentry(const char *tablename, const struct ipt_ip *ip,
-                     void *matchinfo, unsigned int matchsize,
-                     unsigned int hook_mask)
+static int
+checkentry(const char *tablename,
+          const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
+           unsigned int hook_mask)
 {
-       if (matchsize != IPT_ALIGN(sizeof(struct ipt_dscp_info)))
+       const u_int8_t dscp = ((struct ipt_DSCP_info *)targinfo)->dscp;
+
+       if (targinfosize != IPT_ALIGN(sizeof(struct ipt_DSCP_info))) {
+               printk(KERN_WARNING "DSCP: targinfosize %u != %Zu\n",
+                      targinfosize,
+                      IPT_ALIGN(sizeof(struct ipt_DSCP_info)));
                return 0;
+       }
+
+       if (strcmp(tablename, "mangle") != 0) {
+               printk(KERN_WARNING "DSCP: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+               return 0;
+       }
+
+       if ((dscp > IPT_DSCP_MAX)) {
+               printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
+               return 0;
+       }
 
        return 1;
 }
 
-static struct ipt_match dscp_match = {
-       .name           = "dscp",
-       .match          = &match,
-       .checkentry     = &checkentry,
+static struct ipt_target ipt_dscp_reg = {
+       .name           = "DSCP",
+       .target         = target,
+       .checkentry     = checkentry,
        .me             = THIS_MODULE,
 };
 
 static int __init init(void)
 {
-       return ipt_register_match(&dscp_match);
+       return ipt_register_target(&ipt_dscp_reg);
 }
 
 static void __exit fini(void)
 {
-       ipt_unregister_match(&dscp_match);
-
+       ipt_unregister_target(&ipt_dscp_reg);
 }
 
 module_init(init);