#include <linux/netfilter_ipv4/ipt_TTL.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
-MODULE_DESCRIPTION("IP tables TTL modification module");
+MODULE_DESCRIPTION("Xtables: IPv4 TTL field modification target");
MODULE_LICENSE("GPL");
static unsigned int
-ipt_ttl_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)
+ttl_tg(struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, unsigned int hooknum,
+ const struct xt_target *target, const void *targinfo)
{
struct iphdr *iph;
const struct ipt_TTL_info *info = targinfo;
int new_ttl;
- if (!skb_make_writable(pskb, (*pskb)->len))
+ if (!skb_make_writable(skb, skb->len))
return NF_DROP;
- iph = (*pskb)->nh.iph;
+ iph = ip_hdr(skb);
switch (info->mode) {
case IPT_TTL_SET:
}
if (new_ttl != iph->ttl) {
- nf_csum_replace2(&iph->check, htons(iph->ttl << 8),
- htons(new_ttl << 8));
+ csum_replace2(&iph->check, htons(iph->ttl << 8),
+ htons(new_ttl << 8));
iph->ttl = new_ttl;
}
return XT_CONTINUE;
}
-static int ipt_ttl_checkentry(const char *tablename,
- const void *e,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
+static bool
+ttl_tg_check(const char *tablename, const void *e,
+ const struct xt_target *target, void *targinfo,
+ unsigned int hook_mask)
{
- struct ipt_TTL_info *info = targinfo;
+ const struct ipt_TTL_info *info = targinfo;
if (info->mode > IPT_TTL_MAXMODE) {
printk(KERN_WARNING "ipt_TTL: invalid or unknown Mode %u\n",
info->mode);
- return 0;
+ return false;
}
- if ((info->mode != IPT_TTL_SET) && (info->ttl == 0))
- return 0;
- return 1;
+ if (info->mode != IPT_TTL_SET && info->ttl == 0)
+ return false;
+ return true;
}
-static struct xt_target ipt_TTL = {
+static struct xt_target ttl_tg_reg __read_mostly = {
.name = "TTL",
.family = AF_INET,
- .target = ipt_ttl_target,
+ .target = ttl_tg,
.targetsize = sizeof(struct ipt_TTL_info),
.table = "mangle",
- .checkentry = ipt_ttl_checkentry,
+ .checkentry = ttl_tg_check,
.me = THIS_MODULE,
};
-static int __init ipt_ttl_init(void)
+static int __init ttl_tg_init(void)
{
- return xt_register_target(&ipt_TTL);
+ return xt_register_target(&ttl_tg_reg);
}
-static void __exit ipt_ttl_fini(void)
+static void __exit ttl_tg_exit(void)
{
- xt_unregister_target(&ipt_TTL);
+ xt_unregister_target(&ttl_tg_reg);
}
-module_init(ipt_ttl_init);
-module_exit(ipt_ttl_fini);
+module_init(ttl_tg_init);
+module_exit(ttl_tg_exit);