diff options
Diffstat (limited to 'net/ipv4/netfilter/ipt_TTL.c')
-rw-r--r-- | net/ipv4/netfilter/ipt_TTL.c | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/net/ipv4/netfilter/ipt_TTL.c b/net/ipv4/netfilter/ipt_TTL.c deleted file mode 100644 index 6d76aae90cc..00000000000 --- a/net/ipv4/netfilter/ipt_TTL.c +++ /dev/null @@ -1,97 +0,0 @@ -/* TTL modification target for IP tables - * (C) 2000,2005 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 <net/checksum.h> - -#include <linux/netfilter/x_tables.h> -#include <linux/netfilter_ipv4/ipt_TTL.h> - -MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); -MODULE_DESCRIPTION("Xtables: IPv4 TTL field modification target"); -MODULE_LICENSE("GPL"); - -static unsigned int -ttl_tg(struct sk_buff *skb, const struct xt_target_param *par) -{ - struct iphdr *iph; - const struct ipt_TTL_info *info = par->targinfo; - int new_ttl; - - if (!skb_make_writable(skb, skb->len)) - return NF_DROP; - - iph = ip_hdr(skb); - - switch (info->mode) { - case IPT_TTL_SET: - new_ttl = info->ttl; - break; - case IPT_TTL_INC: - new_ttl = iph->ttl + info->ttl; - if (new_ttl > 255) - new_ttl = 255; - break; - case IPT_TTL_DEC: - new_ttl = iph->ttl - info->ttl; - if (new_ttl < 0) - new_ttl = 0; - break; - default: - new_ttl = iph->ttl; - break; - } - - if (new_ttl != iph->ttl) { - csum_replace2(&iph->check, htons(iph->ttl << 8), - htons(new_ttl << 8)); - iph->ttl = new_ttl; - } - - return XT_CONTINUE; -} - -static bool ttl_tg_check(const struct xt_tgchk_param *par) -{ - const struct ipt_TTL_info *info = par->targinfo; - - if (info->mode > IPT_TTL_MAXMODE) { - printk(KERN_WARNING "ipt_TTL: invalid or unknown Mode %u\n", - info->mode); - return false; - } - if (info->mode != IPT_TTL_SET && info->ttl == 0) - return false; - return true; -} - -static struct xt_target ttl_tg_reg __read_mostly = { - .name = "TTL", - .family = NFPROTO_IPV4, - .target = ttl_tg, - .targetsize = sizeof(struct ipt_TTL_info), - .table = "mangle", - .checkentry = ttl_tg_check, - .me = THIS_MODULE, -}; - -static int __init ttl_tg_init(void) -{ - return xt_register_target(&ttl_tg_reg); -} - -static void __exit ttl_tg_exit(void) -{ - xt_unregister_target(&ttl_tg_reg); -} - -module_init(ttl_tg_init); -module_exit(ttl_tg_exit); |