-/* This is a module which is used for setting the TOS field of a packet. */
+/* Kernel module to match TOS values. */
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
#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_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
-MODULE_DESCRIPTION("iptables TOS mangling module");
+MODULE_DESCRIPTION("iptables TOS match module");
-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)
+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)
{
- const struct ipt_tos_target_info *tosinfo = targinfo;
-
- if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
- u_int16_t diffs[2];
+ const struct ipt_tos_info *info = matchinfo;
- 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;
+ return (skb->nh.iph->tos == info->tos) ^ info->invert;
}
static int
checkentry(const char *tablename,
- const struct ipt_entry *e,
- void *targinfo,
- unsigned int targinfosize,
+ const struct ipt_ip *ip,
+ void *matchinfo,
+ unsigned int matchsize,
unsigned int hook_mask)
{
- 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);
+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info)))
return 0;
- }
return 1;
}
-static struct ipt_target ipt_tos_reg = {
- .name = "TOS",
- .target = target,
- .checkentry = checkentry,
+static struct ipt_match tos_match = {
+ .name = "tos",
+ .match = &match,
+ .checkentry = &checkentry,
.me = THIS_MODULE,
};
static int __init init(void)
{
- return ipt_register_target(&ipt_tos_reg);
+ return ipt_register_match(&tos_match);
}
static void __exit fini(void)
{
- ipt_unregister_target(&ipt_tos_reg);
+ ipt_unregister_match(&tos_match);
}
module_init(init);