[SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h
[linux-2.6/mini2440.git] / net / netfilter / xt_DSCP.c
bloba97704a3f95ce13359609ba68252189fac638b24
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 * xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp
15 #include <linux/module.h>
16 #include <linux/skbuff.h>
17 #include <linux/ip.h>
18 #include <linux/ipv6.h>
19 #include <net/dsfield.h>
21 #include <linux/netfilter/x_tables.h>
22 #include <linux/netfilter/xt_DSCP.h>
24 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
25 MODULE_DESCRIPTION("x_tables DSCP modification module");
26 MODULE_LICENSE("GPL");
27 MODULE_ALIAS("ipt_DSCP");
28 MODULE_ALIAS("ip6t_DSCP");
30 static unsigned int target(struct sk_buff **pskb,
31 const struct net_device *in,
32 const struct net_device *out,
33 unsigned int hooknum,
34 const struct xt_target *target,
35 const void *targinfo)
37 const struct xt_DSCP_info *dinfo = targinfo;
38 u_int8_t dscp = ipv4_get_dsfield(ip_hdr(*pskb)) >> XT_DSCP_SHIFT;
40 if (dscp != dinfo->dscp) {
41 if (!skb_make_writable(pskb, sizeof(struct iphdr)))
42 return NF_DROP;
44 ipv4_change_dsfield(ip_hdr(*pskb), (__u8)(~XT_DSCP_MASK),
45 dinfo->dscp << XT_DSCP_SHIFT);
48 return XT_CONTINUE;
51 static unsigned int target6(struct sk_buff **pskb,
52 const struct net_device *in,
53 const struct net_device *out,
54 unsigned int hooknum,
55 const struct xt_target *target,
56 const void *targinfo)
58 const struct xt_DSCP_info *dinfo = targinfo;
59 u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(*pskb)) >> XT_DSCP_SHIFT;
61 if (dscp != dinfo->dscp) {
62 if (!skb_make_writable(pskb, sizeof(struct ipv6hdr)))
63 return NF_DROP;
65 ipv6_change_dsfield(ipv6_hdr(*pskb), (__u8)(~XT_DSCP_MASK),
66 dinfo->dscp << XT_DSCP_SHIFT);
68 return XT_CONTINUE;
71 static int checkentry(const char *tablename,
72 const void *e_void,
73 const struct xt_target *target,
74 void *targinfo,
75 unsigned int hook_mask)
77 const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp;
79 if ((dscp > XT_DSCP_MAX)) {
80 printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp);
81 return 0;
83 return 1;
86 static struct xt_target xt_dscp_target[] = {
88 .name = "DSCP",
89 .family = AF_INET,
90 .checkentry = checkentry,
91 .target = target,
92 .targetsize = sizeof(struct xt_DSCP_info),
93 .table = "mangle",
94 .me = THIS_MODULE,
97 .name = "DSCP",
98 .family = AF_INET6,
99 .checkentry = checkentry,
100 .target = target6,
101 .targetsize = sizeof(struct xt_DSCP_info),
102 .table = "mangle",
103 .me = THIS_MODULE,
107 static int __init xt_dscp_target_init(void)
109 return xt_register_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
112 static void __exit xt_dscp_target_fini(void)
114 xt_unregister_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target));
117 module_init(xt_dscp_target_init);
118 module_exit(xt_dscp_target_fini);