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a468701d YK |
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 | * xt_DSCP.c,v 1.8 2002/08/06 18:41:57 laforge Exp | |
13 | */ | |
14 | ||
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> | |
20 | ||
21 | #include <linux/netfilter/x_tables.h> | |
22 | #include <linux/netfilter/xt_DSCP.h> | |
23 | ||
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"); | |
29 | ||
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, | |
fe1cb108 | 35 | const void *targinfo) |
a468701d YK |
36 | { |
37 | const struct xt_DSCP_info *dinfo = targinfo; | |
38 | u_int8_t dscp = ipv4_get_dsfield((*pskb)->nh.iph) >> XT_DSCP_SHIFT; | |
39 | ||
40 | if (dscp != dinfo->dscp) { | |
41 | if (!skb_make_writable(pskb, sizeof(struct iphdr))) | |
42 | return NF_DROP; | |
43 | ||
44 | ipv4_change_dsfield((*pskb)->nh.iph, (__u8)(~XT_DSCP_MASK), | |
45 | dinfo->dscp << XT_DSCP_SHIFT); | |
46 | ||
47 | } | |
48 | return XT_CONTINUE; | |
49 | } | |
50 | ||
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, | |
fe1cb108 | 56 | const void *targinfo) |
a468701d YK |
57 | { |
58 | const struct xt_DSCP_info *dinfo = targinfo; | |
59 | u_int8_t dscp = ipv6_get_dsfield((*pskb)->nh.ipv6h) >> XT_DSCP_SHIFT; | |
60 | ||
61 | if (dscp != dinfo->dscp) { | |
62 | if (!skb_make_writable(pskb, sizeof(struct ipv6hdr))) | |
63 | return NF_DROP; | |
64 | ||
65 | ipv6_change_dsfield((*pskb)->nh.ipv6h, (__u8)(~XT_DSCP_MASK), | |
66 | dinfo->dscp << XT_DSCP_SHIFT); | |
67 | } | |
68 | return XT_CONTINUE; | |
69 | } | |
70 | ||
71 | static int checkentry(const char *tablename, | |
72 | const void *e_void, | |
73 | const struct xt_target *target, | |
74 | void *targinfo, | |
a468701d YK |
75 | unsigned int hook_mask) |
76 | { | |
77 | const u_int8_t dscp = ((struct xt_DSCP_info *)targinfo)->dscp; | |
78 | ||
79 | if ((dscp > XT_DSCP_MAX)) { | |
80 | printk(KERN_WARNING "DSCP: dscp %x out of range\n", dscp); | |
81 | return 0; | |
82 | } | |
83 | return 1; | |
84 | } | |
85 | ||
4470bbc7 PM |
86 | static struct xt_target xt_dscp_target[] = { |
87 | { | |
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, | |
95 | }, | |
96 | { | |
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, | |
104 | }, | |
a468701d YK |
105 | }; |
106 | ||
107 | static int __init xt_dscp_target_init(void) | |
108 | { | |
4470bbc7 | 109 | return xt_register_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target)); |
a468701d YK |
110 | } |
111 | ||
112 | static void __exit xt_dscp_target_fini(void) | |
113 | { | |
4470bbc7 | 114 | xt_unregister_targets(xt_dscp_target, ARRAY_SIZE(xt_dscp_target)); |
a468701d YK |
115 | } |
116 | ||
117 | module_init(xt_dscp_target_init); | |
118 | module_exit(xt_dscp_target_fini); |