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Linux/net/netfilter/xt_DSCP.c

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  1 /* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
  2  *
  3  * (C) 2002 by Harald Welte <laforge@netfilter.org>
  4  * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
  5  *
  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.
  9  *
 10  * See RFC2474 for a description of the DSCP field within the IP Header.
 11 */
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/ip.h>
 16 #include <linux/ipv6.h>
 17 #include <net/dsfield.h>
 18 
 19 #include <linux/netfilter/x_tables.h>
 20 #include <linux/netfilter/xt_DSCP.h>
 21 
 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");
 29 
 30 static unsigned int
 31 dscp_tg(struct sk_buff *skb, const struct xt_action_param *par)
 32 {
 33         const struct xt_DSCP_info *dinfo = par->targinfo;
 34         u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
 35 
 36         if (dscp != dinfo->dscp) {
 37                 if (!skb_make_writable(skb, sizeof(struct iphdr)))
 38                         return NF_DROP;
 39 
 40                 ipv4_change_dsfield(ip_hdr(skb),
 41                                     (__force __u8)(~XT_DSCP_MASK),
 42                                     dinfo->dscp << XT_DSCP_SHIFT);
 43 
 44         }
 45         return XT_CONTINUE;
 46 }
 47 
 48 static unsigned int
 49 dscp_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 50 {
 51         const struct xt_DSCP_info *dinfo = par->targinfo;
 52         u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
 53 
 54         if (dscp != dinfo->dscp) {
 55                 if (!skb_make_writable(skb, sizeof(struct ipv6hdr)))
 56                         return NF_DROP;
 57 
 58                 ipv6_change_dsfield(ipv6_hdr(skb),
 59                                     (__force __u8)(~XT_DSCP_MASK),
 60                                     dinfo->dscp << XT_DSCP_SHIFT);
 61         }
 62         return XT_CONTINUE;
 63 }
 64 
 65 static int dscp_tg_check(const struct xt_tgchk_param *par)
 66 {
 67         const struct xt_DSCP_info *info = par->targinfo;
 68 
 69         if (info->dscp > XT_DSCP_MAX) {
 70                 pr_info("dscp %x out of range\n", info->dscp);
 71                 return -EDOM;
 72         }
 73         return 0;
 74 }
 75 
 76 static unsigned int
 77 tos_tg(struct sk_buff *skb, const struct xt_action_param *par)
 78 {
 79         const struct xt_tos_target_info *info = par->targinfo;
 80         struct iphdr *iph = ip_hdr(skb);
 81         u_int8_t orig, nv;
 82 
 83         orig = ipv4_get_dsfield(iph);
 84         nv   = (orig & ~info->tos_mask) ^ info->tos_value;
 85 
 86         if (orig != nv) {
 87                 if (!skb_make_writable(skb, sizeof(struct iphdr)))
 88                         return NF_DROP;
 89                 iph = ip_hdr(skb);
 90                 ipv4_change_dsfield(iph, 0, nv);
 91         }
 92 
 93         return XT_CONTINUE;
 94 }
 95 
 96 static unsigned int
 97 tos_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 98 {
 99         const struct xt_tos_target_info *info = par->targinfo;
100         struct ipv6hdr *iph = ipv6_hdr(skb);
101         u_int8_t orig, nv;
102 
103         orig = ipv6_get_dsfield(iph);
104         nv   = (orig & ~info->tos_mask) ^ info->tos_value;
105 
106         if (orig != nv) {
107                 if (!skb_make_writable(skb, sizeof(struct iphdr)))
108                         return NF_DROP;
109                 iph = ipv6_hdr(skb);
110                 ipv6_change_dsfield(iph, 0, nv);
111         }
112 
113         return XT_CONTINUE;
114 }
115 
116 static struct xt_target dscp_tg_reg[] __read_mostly = {
117         {
118                 .name           = "DSCP",
119                 .family         = NFPROTO_IPV4,
120                 .checkentry     = dscp_tg_check,
121                 .target         = dscp_tg,
122                 .targetsize     = sizeof(struct xt_DSCP_info),
123                 .table          = "mangle",
124                 .me             = THIS_MODULE,
125         },
126         {
127                 .name           = "DSCP",
128                 .family         = NFPROTO_IPV6,
129                 .checkentry     = dscp_tg_check,
130                 .target         = dscp_tg6,
131                 .targetsize     = sizeof(struct xt_DSCP_info),
132                 .table          = "mangle",
133                 .me             = THIS_MODULE,
134         },
135         {
136                 .name           = "TOS",
137                 .revision       = 1,
138                 .family         = NFPROTO_IPV4,
139                 .table          = "mangle",
140                 .target         = tos_tg,
141                 .targetsize     = sizeof(struct xt_tos_target_info),
142                 .me             = THIS_MODULE,
143         },
144         {
145                 .name           = "TOS",
146                 .revision       = 1,
147                 .family         = NFPROTO_IPV6,
148                 .table          = "mangle",
149                 .target         = tos_tg6,
150                 .targetsize     = sizeof(struct xt_tos_target_info),
151                 .me             = THIS_MODULE,
152         },
153 };
154 
155 static int __init dscp_tg_init(void)
156 {
157         return xt_register_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
158 }
159 
160 static void __exit dscp_tg_exit(void)
161 {
162         xt_unregister_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
163 }
164 
165 module_init(dscp_tg_init);
166 module_exit(dscp_tg_exit);
167 

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