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author | Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> | 2006-08-22 00:30:26 -0700 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 14:55:22 -0700 |
commit | a468701db58a8b3e08e3f55fa6ac66db42014922 (patch) | |
tree | 7b4b0fe62a7d15eae25b3013fd3ecaf13bce5028 /net/netfilter | |
parent | 9ba1627617d396135a4d679542a3623d5819e628 (diff) | |
download | op-kernel-dev-a468701db58a8b3e08e3f55fa6ac66db42014922.zip op-kernel-dev-a468701db58a8b3e08e3f55fa6ac66db42014922.tar.gz |
[NETFILTER]: x_tables: replace IPv4 DSCP target by address family independent version
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>
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/Kconfig | 12 | ||||
-rw-r--r-- | net/netfilter/Makefile | 1 | ||||
-rw-r--r-- | net/netfilter/xt_DSCP.c | 130 |
3 files changed, 143 insertions, 0 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index f781405..0a28d2c 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -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 diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 0b8a70c..a74be49 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -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 diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c new file mode 100644 index 0000000..79df816 --- /dev/null +++ b/net/netfilter/xt_DSCP.c @@ -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); |