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1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
2 | * |
3 | * (C) 2002 by Harald Welte <laforge@netfilter.org> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License version 2 as |
7 | * published by the Free Software Foundation. |
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 match"); |
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 bool |
28 | dscp_mt(const struct sk_buff *skb, struct xt_action_param *par) |
29 | { |
30 | const struct xt_dscp_info *info = par->matchinfo; |
31 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
32 | |
33 | return (dscp == info->dscp) ^ !!info->invert; |
34 | } |
35 | |
36 | static bool |
37 | dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
38 | { |
39 | const struct xt_dscp_info *info = par->matchinfo; |
40 | u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; |
41 | |
42 | return (dscp == info->dscp) ^ !!info->invert; |
43 | } |
44 | |
45 | static int dscp_mt_check(const struct xt_mtchk_param *par) |
46 | { |
47 | const struct xt_dscp_info *info = par->matchinfo; |
48 | |
49 | if (info->dscp > XT_DSCP_MAX) { |
50 | pr_info("dscp %x out of range\n", info->dscp); |
51 | return -EDOM; |
52 | } |
53 | |
54 | return 0; |
55 | } |
56 | |
57 | static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par) |
58 | { |
59 | const struct xt_tos_match_info *info = par->matchinfo; |
60 | |
61 | if (par->family == NFPROTO_IPV4) |
62 | return ((ip_hdr(skb)->tos & info->tos_mask) == |
63 | info->tos_value) ^ !!info->invert; |
64 | else |
65 | return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) == |
66 | info->tos_value) ^ !!info->invert; |
67 | } |
68 | |
69 | static struct xt_match dscp_mt_reg[] __read_mostly = { |
70 | { |
71 | .name = "dscp", |
72 | .family = NFPROTO_IPV4, |
73 | .checkentry = dscp_mt_check, |
74 | .match = dscp_mt, |
75 | .matchsize = sizeof(struct xt_dscp_info), |
76 | .me = THIS_MODULE, |
77 | }, |
78 | { |
79 | .name = "dscp", |
80 | .family = NFPROTO_IPV6, |
81 | .checkentry = dscp_mt_check, |
82 | .match = dscp_mt6, |
83 | .matchsize = sizeof(struct xt_dscp_info), |
84 | .me = THIS_MODULE, |
85 | }, |
86 | { |
87 | .name = "tos", |
88 | .revision = 1, |
89 | .family = NFPROTO_IPV4, |
90 | .match = tos_mt, |
91 | .matchsize = sizeof(struct xt_tos_match_info), |
92 | .me = THIS_MODULE, |
93 | }, |
94 | { |
95 | .name = "tos", |
96 | .revision = 1, |
97 | .family = NFPROTO_IPV6, |
98 | .match = tos_mt, |
99 | .matchsize = sizeof(struct xt_tos_match_info), |
100 | .me = THIS_MODULE, |
101 | }, |
102 | }; |
103 | |
104 | static int __init dscp_mt_init(void) |
105 | { |
106 | return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
107 | } |
108 | |
109 | static void __exit dscp_mt_exit(void) |
110 | { |
111 | xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
112 | } |
113 | |
114 | module_init(dscp_mt_init); |
115 | module_exit(dscp_mt_exit); |
116 |
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