commit 563d36eb3fb22dd04da9aa6f12e1b9ba0ac115f3
Author: Jan Engelhardt <jengelh@xxxxxxxxxx>
Date: Wed Feb 18 18:38:40 2009 +0100
netfilter: Combine ipt_TTL and ip6t_HL source
Suggested by: James King <t.james.king@xxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
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@xxxxxxxxxxxxx>
- *
- * 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@xxxxxxxxxxxxx>");
-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);
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 53ea512..6a42a96 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 3f17c94..61a4570 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 27b5adf..0000000
--- a/net/ipv6/netfilter/ip6t_HL.c
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * Hop Limit modification target for ip6tables
- * Maciej Soltysiak <solt@xxxxxxxxxxxxxxxxx>
- * 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@xxxxxxxxxxxxxxxxx>");
-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);
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index c2bac9c..d99f29b 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -357,6 +357,21 @@ config NETFILTER_XT_TARGET_DSCP
To compile it as a module, choose M here. If unsure, say N.
+config NETFILTER_XT_TARGET_HL
+ tristate '"HL" hoplimit target support'
+ depends on IP_NF_MANGLE || IP6_NF_MANGLE
+ depends on NETFILTER_ADVANCED
+ ---help---
+ This option adds the "HL" (for IPv6) and "TTL" (for IPv4)
+ targets, which enable the user to change the
+ hoplimit/time-to-live value of the IP header.
+
+ While it is safe to decrement the hoplimit/TTL value, the
+ modules also allow to increment and set the hoplimit value of
+ the header to arbitrary values. This is EXTREMELY DANGEROUS
+ since you can easily create immortal packets that loop
+ forever on the network.
+
config NETFILTER_XT_TARGET_MARK
tristate '"MARK" target support'
default m if NETFILTER_ADVANCED=n
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index da3d909..6ebe048 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIFY) += xt_CLASSIFY.o
obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
+obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o
obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
diff --git a/net/netfilter/xt_HL.c b/net/netfilter/xt_HL.c
new file mode 100644
index 0000000..10e789e
--- /dev/null
+++ b/net/netfilter/xt_HL.c
@@ -0,0 +1,171 @@
+/*
+ * TTL modification target for IP tables
+ * (C) 2000,2005 by Harald Welte <laforge@xxxxxxxxxxxxx>
+ *
+ * Hop Limit modification target for ip6tables
+ * Maciej Soltysiak <solt@xxxxxxxxxxxxxxxxx>
+ *
+ * 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 <linux/ipv6.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ipt_TTL.h>
+#include <linux/netfilter_ipv6/ip6t_HL.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@xxxxxxxxxxxxx>");
+MODULE_AUTHOR("Maciej Soltysiak <solt@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Xtables: Hoplimit/TTL Limit 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 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 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 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_tg_reg[] __read_mostly = {
+ {
+ .name = "TTL",
+ .revision = 0,
+ .family = NFPROTO_IPV4,
+ .target = ttl_tg,
+ .targetsize = sizeof(struct ipt_TTL_info),
+ .table = "mangle",
+ .checkentry = ttl_tg_check,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "HL",
+ .revision = 0,
+ .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_tg_init(void)
+{
+ return xt_register_targets(hl_tg_reg, ARRAY_SIZE(hl_tg_reg));
+}
+
+static void __exit hl_tg_exit(void)
+{
+ xt_unregister_targets(hl_tg_reg, ARRAY_SIZE(hl_tg_reg));
+}
+
+module_init(hl_tg_init);
+module_exit(hl_tg_exit);
+MODULE_ALIAS("ipt_TTL");
+MODULE_ALIAS("ip6t_HL");
--
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