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/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 53ea512c4608..6a42a968c498 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -170,23 +170,6 @@ config IP6_NF_MANGLE
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
-config IP6_NF_TARGET_HL
-	tristate  'HL (hoplimit) target support'
-	depends on IP6_NF_MANGLE
-	depends on NETFILTER_ADVANCED
-	help
-	  This option adds a `HL' target, which enables the user to decrement
-	  the hoplimit value of the IPv6 header or set it to a given (lower)
-	  value.
-
-	  While it is safe to decrement the hoplimit value, this option also
-	  enables functionality to increment and set the hoplimit value of the
-	  IPv6 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.
-
 config IP6_NF_RAW
 	tristate  'raw table support (required for TRACE)'
 	depends on NETFILTER_ADVANCED
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index 3f17c948eefb..61a4570d0ede 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -27,6 +27,5 @@ obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o
 obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o
 
 # targets
-obj-$(CONFIG_IP6_NF_TARGET_HL) += ip6t_HL.o
 obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
 obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
diff --git a/net/ipv6/netfilter/ip6t_HL.c b/net/ipv6/netfilter/ip6t_HL.c
deleted file mode 100644
index 27b5adf670a2..000000000000
--- a/net/ipv6/netfilter/ip6t_HL.c
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * Hop Limit modification target for ip6tables
- * Maciej Soltysiak <solt@dns.toxicfilms.tv>
- * Based on HW's TTL module
- *
- * This software is distributed under the terms of GNU GPL
- */
-
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter_ipv6/ip6t_HL.h>
-
-MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
-MODULE_DESCRIPTION("Xtables: IPv6 Hop Limit field modification target");
-MODULE_LICENSE("GPL");
-
-static unsigned int
-hl_tg6(struct sk_buff *skb, const struct xt_target_param *par)
-{
-	struct ipv6hdr *ip6h;
-	const struct ip6t_HL_info *info = par->targinfo;
-	int new_hl;
-
-	if (!skb_make_writable(skb, skb->len))
-		return NF_DROP;
-
-	ip6h = ipv6_hdr(skb);
-
-	switch (info->mode) {
-		case IP6T_HL_SET:
-			new_hl = info->hop_limit;
-			break;
-		case IP6T_HL_INC:
-			new_hl = ip6h->hop_limit + info->hop_limit;
-			if (new_hl > 255)
-				new_hl = 255;
-			break;
-		case IP6T_HL_DEC:
-			new_hl = ip6h->hop_limit - info->hop_limit;
-			if (new_hl < 0)
-				new_hl = 0;
-			break;
-		default:
-			new_hl = ip6h->hop_limit;
-			break;
-	}
-
-	ip6h->hop_limit = new_hl;
-
-	return XT_CONTINUE;
-}
-
-static bool hl_tg6_check(const struct xt_tgchk_param *par)
-{
-	const struct ip6t_HL_info *info = par->targinfo;
-
-	if (info->mode > IP6T_HL_MAXMODE) {
-		printk(KERN_WARNING "ip6t_HL: invalid or unknown Mode %u\n",
-			info->mode);
-		return false;
-	}
-	if (info->mode != IP6T_HL_SET && info->hop_limit == 0) {
-		printk(KERN_WARNING "ip6t_HL: increment/decrement doesn't "
-			"make sense with value 0\n");
-		return false;
-	}
-	return true;
-}
-
-static struct xt_target hl_tg6_reg __read_mostly = {
-	.name 		= "HL",
-	.family		= NFPROTO_IPV6,
-	.target		= hl_tg6,
-	.targetsize	= sizeof(struct ip6t_HL_info),
-	.table		= "mangle",
-	.checkentry	= hl_tg6_check,
-	.me		= THIS_MODULE
-};
-
-static int __init hl_tg6_init(void)
-{
-	return xt_register_target(&hl_tg6_reg);
-}
-
-static void __exit hl_tg6_exit(void)
-{
-	xt_unregister_target(&hl_tg6_reg);
-}
-
-module_init(hl_tg6_init);
-module_exit(hl_tg6_exit);