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Linux/net/netfilter/xt_DSCP.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /* x_tables module for setting the IPv4/IPv6 DSCP field, Version 1.8
  3  *
  4  * (C) 2002 by Harald Welte <laforge@netfilter.org>
  5  * based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>
  6  *
  7  * See RFC2474 for a description of the DSCP field within the IP Header.
  8 */
  9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/ip.h>
 13 #include <linux/ipv6.h>
 14 #include <net/dsfield.h>
 15 
 16 #include <linux/netfilter/x_tables.h>
 17 #include <linux/netfilter/xt_DSCP.h>
 18 
 19 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
 20 MODULE_DESCRIPTION("Xtables: DSCP/TOS field modification");
 21 MODULE_LICENSE("GPL");
 22 MODULE_ALIAS("ipt_DSCP");
 23 MODULE_ALIAS("ip6t_DSCP");
 24 MODULE_ALIAS("ipt_TOS");
 25 MODULE_ALIAS("ip6t_TOS");
 26 
 27 static unsigned int
 28 dscp_tg(struct sk_buff *skb, const struct xt_action_param *par)
 29 {
 30         const struct xt_DSCP_info *dinfo = par->targinfo;
 31         u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
 32 
 33         if (dscp != dinfo->dscp) {
 34                 if (skb_ensure_writable(skb, sizeof(struct iphdr)))
 35                         return NF_DROP;
 36 
 37                 ipv4_change_dsfield(ip_hdr(skb),
 38                                     (__force __u8)(~XT_DSCP_MASK),
 39                                     dinfo->dscp << XT_DSCP_SHIFT);
 40 
 41         }
 42         return XT_CONTINUE;
 43 }
 44 
 45 static unsigned int
 46 dscp_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 47 {
 48         const struct xt_DSCP_info *dinfo = par->targinfo;
 49         u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
 50 
 51         if (dscp != dinfo->dscp) {
 52                 if (skb_ensure_writable(skb, sizeof(struct ipv6hdr)))
 53                         return NF_DROP;
 54 
 55                 ipv6_change_dsfield(ipv6_hdr(skb),
 56                                     (__force __u8)(~XT_DSCP_MASK),
 57                                     dinfo->dscp << XT_DSCP_SHIFT);
 58         }
 59         return XT_CONTINUE;
 60 }
 61 
 62 static int dscp_tg_check(const struct xt_tgchk_param *par)
 63 {
 64         const struct xt_DSCP_info *info = par->targinfo;
 65 
 66         if (info->dscp > XT_DSCP_MAX)
 67                 return -EDOM;
 68         return 0;
 69 }
 70 
 71 static unsigned int
 72 tos_tg(struct sk_buff *skb, const struct xt_action_param *par)
 73 {
 74         const struct xt_tos_target_info *info = par->targinfo;
 75         struct iphdr *iph = ip_hdr(skb);
 76         u_int8_t orig, nv;
 77 
 78         orig = ipv4_get_dsfield(iph);
 79         nv   = (orig & ~info->tos_mask) ^ info->tos_value;
 80 
 81         if (orig != nv) {
 82                 if (skb_ensure_writable(skb, sizeof(struct iphdr)))
 83                         return NF_DROP;
 84                 iph = ip_hdr(skb);
 85                 ipv4_change_dsfield(iph, 0, nv);
 86         }
 87 
 88         return XT_CONTINUE;
 89 }
 90 
 91 static unsigned int
 92 tos_tg6(struct sk_buff *skb, const struct xt_action_param *par)
 93 {
 94         const struct xt_tos_target_info *info = par->targinfo;
 95         struct ipv6hdr *iph = ipv6_hdr(skb);
 96         u_int8_t orig, nv;
 97 
 98         orig = ipv6_get_dsfield(iph);
 99         nv   = (orig & ~info->tos_mask) ^ info->tos_value;
100 
101         if (orig != nv) {
102                 if (skb_ensure_writable(skb, sizeof(struct iphdr)))
103                         return NF_DROP;
104                 iph = ipv6_hdr(skb);
105                 ipv6_change_dsfield(iph, 0, nv);
106         }
107 
108         return XT_CONTINUE;
109 }
110 
111 static struct xt_target dscp_tg_reg[] __read_mostly = {
112         {
113                 .name           = "DSCP",
114                 .family         = NFPROTO_IPV4,
115                 .checkentry     = dscp_tg_check,
116                 .target         = dscp_tg,
117                 .targetsize     = sizeof(struct xt_DSCP_info),
118                 .table          = "mangle",
119                 .me             = THIS_MODULE,
120         },
121         {
122                 .name           = "DSCP",
123                 .family         = NFPROTO_IPV6,
124                 .checkentry     = dscp_tg_check,
125                 .target         = dscp_tg6,
126                 .targetsize     = sizeof(struct xt_DSCP_info),
127                 .table          = "mangle",
128                 .me             = THIS_MODULE,
129         },
130         {
131                 .name           = "TOS",
132                 .revision       = 1,
133                 .family         = NFPROTO_IPV4,
134                 .table          = "mangle",
135                 .target         = tos_tg,
136                 .targetsize     = sizeof(struct xt_tos_target_info),
137                 .me             = THIS_MODULE,
138         },
139         {
140                 .name           = "TOS",
141                 .revision       = 1,
142                 .family         = NFPROTO_IPV6,
143                 .table          = "mangle",
144                 .target         = tos_tg6,
145                 .targetsize     = sizeof(struct xt_tos_target_info),
146                 .me             = THIS_MODULE,
147         },
148 };
149 
150 static int __init dscp_tg_init(void)
151 {
152         return xt_register_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
153 }
154 
155 static void __exit dscp_tg_exit(void)
156 {
157         xt_unregister_targets(dscp_tg_reg, ARRAY_SIZE(dscp_tg_reg));
158 }
159 
160 module_init(dscp_tg_init);
161 module_exit(dscp_tg_exit);
162 

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