1 /* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
3 * (C) 2002 by Harald Welte <laforge@netfilter.org>
4 * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * See RFC2474 for a description of the DSCP field within the IP Header.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/module.h>
14 #include <linux/skbuff.h>
16 #include <linux/ipv6.h>
17 #include <net/dsfield.h>
19 #include <linux/netfilter/x_tables.h>
20 #include <linux/netfilter/xt_DSCP.h>
22 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
23 MODULE_DESCRIPTION("Xtables: DSCP/TOS field modification");
24 MODULE_LICENSE("GPL");
25 MODULE_ALIAS("ipt_DSCP");
26 MODULE_ALIAS("ip6t_DSCP");
27 MODULE_ALIAS("ipt_TOS");
28 MODULE_ALIAS("ip6t_TOS");
31 dscp_tg(struct sk_buff
*skb
, const struct xt_action_param
*par
)
33 const struct xt_DSCP_info
*dinfo
= par
->targinfo
;
34 u_int8_t dscp
= ipv4_get_dsfield(ip_hdr(skb
)) >> XT_DSCP_SHIFT
;
36 if (dscp
!= dinfo
->dscp
) {
37 if (!skb_make_writable(skb
, sizeof(struct iphdr
)))
40 ipv4_change_dsfield(ip_hdr(skb
), (__u8
)(~XT_DSCP_MASK
),
41 dinfo
->dscp
<< XT_DSCP_SHIFT
);
48 dscp_tg6(struct sk_buff
*skb
, const struct xt_action_param
*par
)
50 const struct xt_DSCP_info
*dinfo
= par
->targinfo
;
51 u_int8_t dscp
= ipv6_get_dsfield(ipv6_hdr(skb
)) >> XT_DSCP_SHIFT
;
53 if (dscp
!= dinfo
->dscp
) {
54 if (!skb_make_writable(skb
, sizeof(struct ipv6hdr
)))
57 ipv6_change_dsfield(ipv6_hdr(skb
), (__u8
)(~XT_DSCP_MASK
),
58 dinfo
->dscp
<< XT_DSCP_SHIFT
);
63 static int dscp_tg_check(const struct xt_tgchk_param
*par
)
65 const struct xt_DSCP_info
*info
= par
->targinfo
;
67 if (info
->dscp
> XT_DSCP_MAX
) {
68 pr_info("dscp %x out of range\n", info
->dscp
);
75 tos_tg(struct sk_buff
*skb
, const struct xt_action_param
*par
)
77 const struct xt_tos_target_info
*info
= par
->targinfo
;
78 struct iphdr
*iph
= ip_hdr(skb
);
81 orig
= ipv4_get_dsfield(iph
);
82 nv
= (orig
& ~info
->tos_mask
) ^ info
->tos_value
;
85 if (!skb_make_writable(skb
, sizeof(struct iphdr
)))
88 ipv4_change_dsfield(iph
, 0, nv
);
95 tos_tg6(struct sk_buff
*skb
, const struct xt_action_param
*par
)
97 const struct xt_tos_target_info
*info
= par
->targinfo
;
98 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
101 orig
= ipv6_get_dsfield(iph
);
102 nv
= (orig
& info
->tos_mask
) ^ info
->tos_value
;
105 if (!skb_make_writable(skb
, sizeof(struct iphdr
)))
108 ipv6_change_dsfield(iph
, 0, nv
);
114 static struct xt_target dscp_tg_reg
[] __read_mostly
= {
117 .family
= NFPROTO_IPV4
,
118 .checkentry
= dscp_tg_check
,
120 .targetsize
= sizeof(struct xt_DSCP_info
),
126 .family
= NFPROTO_IPV6
,
127 .checkentry
= dscp_tg_check
,
129 .targetsize
= sizeof(struct xt_DSCP_info
),
136 .family
= NFPROTO_IPV4
,
139 .targetsize
= sizeof(struct xt_tos_target_info
),
145 .family
= NFPROTO_IPV6
,
148 .targetsize
= sizeof(struct xt_tos_target_info
),
153 static int __init
dscp_tg_init(void)
155 return xt_register_targets(dscp_tg_reg
, ARRAY_SIZE(dscp_tg_reg
));
158 static void __exit
dscp_tg_exit(void)
160 xt_unregister_targets(dscp_tg_reg
, ARRAY_SIZE(dscp_tg_reg
));
163 module_init(dscp_tg_init
);
164 module_exit(dscp_tg_exit
);
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