netfilter: Combine ipt_TTL and ip6t_HL source

Suggested by: James King <t.james.king@gmail.com>

Similarly to commit c9fd49680954714473d6cbd2546d6ff120f96840, merge
TTL and HL. Since HL does not depend on any IPv6-specific function,
no new module dependencies would arise.

With slight adjustments to the Kconfig help text.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

3 files changed, 0 insertions, 113 deletions

diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 3816e1d..3ad9f43 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -322,21 +322,6 @@ config IP_NF_TARGET_ECN
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP_NF_TARGET_TTL
-	tristate  'TTL target support'
-	depends on IP_NF_MANGLE
-	depends on NETFILTER_ADVANCED
-	help
-	  This option adds a `TTL' target, which enables the user to modify
-	  the TTL value of the IP header.
-
-	  While it is safe to decrement/lower the TTL, this target also enables
-	  functionality to increment and set the TTL value of the IP header to
-	  arbitrary values.  This is EXTREMELY DANGEROUS since you can easily
-	  create immortal packets that loop forever on the network.
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 # raw + specific targets
 config IP_NF_RAW
 	tristate  'raw table support (required for NOTRACK/TRACE)'
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 5f9b650..20b0c37 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -61,7 +61,6 @@ obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
 obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o
 obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
 obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
-obj-$(CONFIG_IP_NF_TARGET_TTL) += ipt_TTL.o
 obj-$(CONFIG_IP_NF_TARGET_ULOG) += ipt_ULOG.o
 
 # generic ARP tables
diff --git a/net/ipv4/netfilter/ipt_TTL.c b/net/ipv4/netfilter/ipt_TTL.c
deleted file mode 100644
index 6d76aae..0000000
--- 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);