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[NETFILTER]: x_tables: replace IPv4 DSCP target by address family independent version

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This replaces IPv4 DSCP target by address family independent version.
This also
	- utilizes dsfield.h to get/mangle DS field in IPv4/IPv6 header
	- fixes Kconfig help text.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai 2006-08-22 00:30:26 -07:00 committed by David S. Miller
parent 9ba1627617
commit a468701db5
8 changed files with 165 additions and 112 deletions
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20
include/linux/netfilter/xt_DSCP.h Normal file
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@ -0,0 +1,20 @@
/* x_tables module for setting the IPv4/IPv6 DSCP field
*
* (C) 2002 Harald Welte <laforge@gnumonks.org>
* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
* This software is distributed under GNU GPL v2, 1991
*
* See RFC2474 for a description of the DSCP field within the IP Header.
*
* xt_DSCP.h,v 1.7 2002/03/14 12:03:13 laforge Exp
*/
#ifndef _XT_DSCP_TARGET_H
#define _XT_DSCP_TARGET_H
#include <linux/netfilter/xt_dscp.h>
/* target info */
struct xt_DSCP_info {
u_int8_t dscp;
};
#endif /* _XT_DSCP_TARGET_H */

6
include/linux/netfilter_ipv4/ipt_DSCP.h
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@ -11,10 +11,8 @@
#ifndef _IPT_DSCP_TARGET_H
#define _IPT_DSCP_TARGET_H
#include <linux/netfilter_ipv4/ipt_dscp.h>
#include <linux/netfilter/xt_DSCP.h>
/* target info */
struct ipt_DSCP_info {
u_int8_t dscp;
};
#define ipt_DSCP_info xt_DSCP_info
#endif /* _IPT_DSCP_TARGET_H */

11
net/ipv4/netfilter/Kconfig
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@ -557,17 +557,6 @@ config IP_NF_TARGET_ECN
To compile it as a module, choose M here. If unsure, say N.
config IP_NF_TARGET_DSCP
tristate "DSCP target support"
depends on IP_NF_MANGLE
help
This option adds a `DSCP' match, which allows you to match against
the IPv4 header DSCP field (DSCP codepoint).
The DSCP codepoint can have any value between 0x0 and 0x4f.
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

1
net/ipv4/netfilter/Makefile
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@ -67,7 +67,6 @@ obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
obj-$(CONFIG_IP_NF_TARGET_TOS) += ipt_TOS.o
obj-$(CONFIG_IP_NF_TARGET_ECN) += ipt_ECN.o
obj-$(CONFIG_IP_NF_TARGET_DSCP) += ipt_DSCP.o
obj-$(CONFIG_IP_NF_TARGET_MASQUERADE) += ipt_MASQUERADE.o
obj-$(CONFIG_IP_NF_TARGET_REDIRECT) += ipt_REDIRECT.o
obj-$(CONFIG_IP_NF_TARGET_NETMAP) += ipt_NETMAP.o

96
net/ipv4/netfilter/ipt_DSCP.c
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@ -1,96 +0,0 @@
/* iptables module for setting the IPv4 DSCP field, Version 1.8
*
* (C) 2002 by Harald Welte <laforge@netfilter.org>
* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
*
* 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.
*
* See RFC2474 for a description of the DSCP field within the IP Header.
*
* ipt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_DSCP.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("iptables DSCP modification module");
MODULE_LICENSE("GPL");
static unsigned int
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,
void *userinfo)
{
const struct ipt_DSCP_info *dinfo = targinfo;
u_int8_t sh_dscp = ((dinfo->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
if (((*pskb)->nh.iph->tos & IPT_DSCP_MASK) != sh_dscp) {
u_int16_t diffs[2];
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
return NF_DROP;
diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
(*pskb)->nh.iph->tos = ((*pskb)->nh.iph->tos & ~IPT_DSCP_MASK)
| sh_dscp;
diffs[1] = htons((*pskb)->nh.iph->tos);
(*pskb)->nh.iph->check
= csum_fold(csum_partial((char *)diffs,
sizeof(diffs),
(*pskb)->nh.iph->check
^ 0xFFFF));
}
return IPT_CONTINUE;
}
static int
checkentry(const char *tablename,
const void *e_void,
const struct xt_target *target,
void *targinfo,
unsigned int targinfosize,
unsigned int hook_mask)
{
const u_int8_t dscp = ((struct ipt_DSCP_info *)targinfo)->dscp;
if ((dscp > IPT_DSCP_MAX)) {
printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
return 0;
}
return 1;
}
static struct ipt_target ipt_dscp_reg = {
.name = "DSCP",
.target = target,
.targetsize = sizeof(struct ipt_DSCP_info),
.table = "mangle",
.checkentry = checkentry,
.me = THIS_MODULE,
};
static int __init ipt_dscp_init(void)
{
return ipt_register_target(&ipt_dscp_reg);
}
static void __exit ipt_dscp_fini(void)
{
ipt_unregister_target(&ipt_dscp_reg);
}
module_init(ipt_dscp_init);
module_exit(ipt_dscp_fini);

12
net/netfilter/Kconfig
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@ -148,6 +148,18 @@ config NETFILTER_XT_TARGET_CONNMARK
<file:Documentation/modules.txt>. The module will be called
ipt_CONNMARK.o. If unsure, say `N'.
config NETFILTER_XT_TARGET_DSCP
tristate '"DSCP" target support'
depends on NETFILTER_XTABLES
depends on IP_NF_MANGLE || IP6_NF_MANGLE
help
This option adds a `DSCP' target, which allows you to manipulate
the IPv4/IPv6 header DSCP field (differentiated services codepoint).
The DSCP field can have any value between 0x0 and 0x3f inclusive.
To compile it as a module, choose M here. If unsure, say N.
config NETFILTER_XT_TARGET_MARK
tristate '"MARK" target support'
depends on NETFILTER_XTABLES

1
net/netfilter/Makefile
View File

@ -25,6 +25,7 @@ obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
# targets
obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIFY) += xt_CLASSIFY.o
obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o
obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o
obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o

130
net/netfilter/xt_DSCP.c Normal file
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@ -0,0 +1,130 @@
/* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
*
* (C) 2002 by Harald Welte <laforge@netfilter.org>
* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
*
* 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.
*
* See RFC2474 for a description of the DSCP field within the IP Header.
*
* xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/dsfield.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_DSCP.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("x_tables DSCP modification module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_DSCP");
MODULE_ALIAS("ip6t_DSCP");
static unsigned int 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,
void *userinfo)
{
const struct xt_DSCP_info *dinfo = targinfo;
u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT;
if (dscp != dinfo->dscp) {
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
return NF_DROP;
ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK),
dinfo->dscp << XT_DSCP_SHIFT);
}
return XT_CONTINUE;
}
static unsigned int target6(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,
void *userinfo)
{
const struct xt_DSCP_info *dinfo = targinfo;
u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT;
if (dscp != dinfo->dscp) {
if (!skb_make_writable(pskb, sizeof(struct ipv6hdr)))
return NF_DROP;
ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK),
dinfo->dscp << XT_DSCP_SHIFT);
}
return XT_CONTINUE;
}
static int checkentry(const char *tablename,
const void *e_void,
const struct xt_target *target,
void *targinfo,
unsigned int targinfosize,
unsigned int hook_mask)
{
const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
if ((dscp > XT_DSCP_MAX)) {
printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
return 0;
}
return 1;
}
static struct xt_target xt_dscp_reg = {
.name = "DSCP",
.target = target,
.targetsize = sizeof(struct xt_DSCP_info),
.table = "mangle",
.checkentry = checkentry,
.family = AF_INET,
.me = THIS_MODULE,
};
static struct xt_target xt_dscp6_reg = {
.name = "DSCP",
.target = target6,
.targetsize = sizeof(struct xt_DSCP_info),
.table = "mangle",
.checkentry = checkentry,
.family = AF_INET6,
.me = THIS_MODULE,
};
static int __init xt_dscp_target_init(void)
{
int ret;
ret = xt_register_target(&xt_dscp_reg);
if (ret)
return ret;
ret = xt_register_target(&xt_dscp6_reg);
if (ret)
xt_unregister_target(&xt_dscp_reg);
return ret;
}
static void __exit xt_dscp_target_fini(void)
{
xt_unregister_target(&xt_dscp_reg);
xt_unregister_target(&xt_dscp6_reg);
}
module_init(xt_dscp_target_init);
module_exit(xt_dscp_target_fini);