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

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

diff --git a/kernel/linux/net/ipv4/netfilter/ipt_tos.c b/kernel/linux/net/ipv4/netfilter/ipt_tos.c
index 086a1bb..85c70d2 100755 (executable)
--- a/kernel/linux/net/ipv4/netfilter/ipt_tos.c
+++ b/kernel/linux/net/ipv4/netfilter/ipt_tos.c
@@ -1,4 +1,4 @@
-/* Kernel module to match TOS values. */
+/* This is a module which is used for setting the TOS field of a packet. */
 
 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
@@ -10,54 +10,95 @@
 
 #include <linux/module.h>
 #include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
 
-#include <linux/netfilter_ipv4/ipt_tos.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_TOS.h>
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("iptables TOS match module");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("iptables TOS mangling module");
 
-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_tos_info *info = matchinfo;
+       const struct ipt_tos_target_info *tosinfo = targinfo;
+
+       if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
+               u_int16_t diffs[2];
 
-       return (skb->nh.iph->tos == info->tos) ^ 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 & IPTOS_PREC_MASK)
+                       | tosinfo->tos;
+               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,
+          const struct ipt_entry *e,
+           void *targinfo,
+           unsigned int targinfosize,
            unsigned int hook_mask)
 {
-       if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info)))
+       const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
+
+       if (targinfosize != IPT_ALIGN(sizeof(struct ipt_tos_target_info))) {
+               printk(KERN_WARNING "TOS: targinfosize %u != %Zu\n",
+                      targinfosize,
+                      IPT_ALIGN(sizeof(struct ipt_tos_target_info)));
+               return 0;
+       }
+
+       if (strcmp(tablename, "mangle") != 0) {
+               printk(KERN_WARNING "TOS: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
+               return 0;
+       }
+
+       if (tos != IPTOS_LOWDELAY
+           && tos != IPTOS_THROUGHPUT
+           && tos != IPTOS_RELIABILITY
+           && tos != IPTOS_MINCOST
+           && tos != IPTOS_NORMALSVC) {
+               printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);
                return 0;
+       }
 
        return 1;
 }
 
-static struct ipt_match tos_match = {
-       .name           = "tos",
-       .match          = &match,
-       .checkentry     = &checkentry,
+static struct ipt_target ipt_tos_reg = {
+       .name           = "TOS",
+       .target         = target,
+       .checkentry     = checkentry,
        .me             = THIS_MODULE,
 };
 
 static int __init init(void)
 {
-       return ipt_register_match(&tos_match);
+       return ipt_register_target(&ipt_tos_reg);
 }
 
 static void __exit fini(void)
 {
-       ipt_unregister_match(&tos_match);
+       ipt_unregister_target(&ipt_tos_reg);
 }
 
 module_init(init);