Commit | Line | Data |
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9ba16276 | 1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
9ba16276 YK |
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 | */ | |
8bee4bad | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9ba16276 YK |
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 | ||
9ba16276 | 16 | #include <linux/netfilter/x_tables.h> |
c3b33e6a | 17 | #include <linux/netfilter/xt_dscp.h> |
9ba16276 YK |
18 | |
19 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); | |
2ae15b64 | 20 | MODULE_DESCRIPTION("Xtables: DSCP/TOS field match"); |
9ba16276 YK |
21 | MODULE_LICENSE("GPL"); |
22 | MODULE_ALIAS("ipt_dscp"); | |
23 | MODULE_ALIAS("ip6t_dscp"); | |
c3b33e6a | 24 | MODULE_ALIAS("ipt_tos"); |
f1095ab5 | 25 | MODULE_ALIAS("ip6t_tos"); |
9ba16276 | 26 | |
d3c5ee6d | 27 | static bool |
62fc8051 | 28 | dscp_mt(const struct sk_buff *skb, struct xt_action_param *par) |
1d93a9cb | 29 | { |
f7108a20 | 30 | const struct xt_dscp_info *info = par->matchinfo; |
1d93a9cb JE |
31 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
32 | ||
33 | return (dscp == info->dscp) ^ !!info->invert; | |
34 | } | |
35 | ||
d3c5ee6d | 36 | static bool |
62fc8051 | 37 | dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
9ba16276 | 38 | { |
f7108a20 | 39 | const struct xt_dscp_info *info = par->matchinfo; |
0660e03f | 40 | u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; |
9ba16276 YK |
41 | |
42 | return (dscp == info->dscp) ^ !!info->invert; | |
43 | } | |
44 | ||
b0f38452 | 45 | static int dscp_mt_check(const struct xt_mtchk_param *par) |
9ba16276 | 46 | { |
9b4fce7a | 47 | const struct xt_dscp_info *info = par->matchinfo; |
9ba16276 | 48 | |
9b4fce7a | 49 | if (info->dscp > XT_DSCP_MAX) { |
8bee4bad | 50 | pr_info("dscp %x out of range\n", info->dscp); |
4a5a5c73 | 51 | return -EDOM; |
9ba16276 YK |
52 | } |
53 | ||
bd414ee6 | 54 | return 0; |
9ba16276 YK |
55 | } |
56 | ||
62fc8051 | 57 | static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par) |
f1095ab5 | 58 | { |
f7108a20 | 59 | const struct xt_tos_match_info *info = par->matchinfo; |
f1095ab5 | 60 | |
613dbd95 | 61 | if (xt_family(par) == NFPROTO_IPV4) |
f1095ab5 JE |
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 | ||
d3c5ee6d | 69 | static struct xt_match dscp_mt_reg[] __read_mostly = { |
4470bbc7 PM |
70 | { |
71 | .name = "dscp", | |
ee999d8b | 72 | .family = NFPROTO_IPV4, |
d3c5ee6d JE |
73 | .checkentry = dscp_mt_check, |
74 | .match = dscp_mt, | |
4470bbc7 PM |
75 | .matchsize = sizeof(struct xt_dscp_info), |
76 | .me = THIS_MODULE, | |
77 | }, | |
78 | { | |
79 | .name = "dscp", | |
ee999d8b | 80 | .family = NFPROTO_IPV6, |
d3c5ee6d JE |
81 | .checkentry = dscp_mt_check, |
82 | .match = dscp_mt6, | |
4470bbc7 PM |
83 | .matchsize = sizeof(struct xt_dscp_info), |
84 | .me = THIS_MODULE, | |
85 | }, | |
f1095ab5 JE |
86 | { |
87 | .name = "tos", | |
88 | .revision = 1, | |
ee999d8b | 89 | .family = NFPROTO_IPV4, |
f1095ab5 JE |
90 | .match = tos_mt, |
91 | .matchsize = sizeof(struct xt_tos_match_info), | |
92 | .me = THIS_MODULE, | |
93 | }, | |
94 | { | |
95 | .name = "tos", | |
96 | .revision = 1, | |
ee999d8b | 97 | .family = NFPROTO_IPV6, |
f1095ab5 JE |
98 | .match = tos_mt, |
99 | .matchsize = sizeof(struct xt_tos_match_info), | |
100 | .me = THIS_MODULE, | |
101 | }, | |
9ba16276 YK |
102 | }; |
103 | ||
d3c5ee6d | 104 | static int __init dscp_mt_init(void) |
9ba16276 | 105 | { |
d3c5ee6d | 106 | return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
9ba16276 YK |
107 | } |
108 | ||
d3c5ee6d | 109 | static void __exit dscp_mt_exit(void) |
9ba16276 | 110 | { |
d3c5ee6d | 111 | xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
9ba16276 YK |
112 | } |
113 | ||
d3c5ee6d JE |
114 | module_init(dscp_mt_init); |
115 | module_exit(dscp_mt_exit); |