Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 1 | /* IP tables module for matching the value of the IPv4/IPv6 DSCP field |
| 2 | * |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 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 | */ |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame] | 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 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 | |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 16 | #include <linux/netfilter/x_tables.h> |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 17 | #include <linux/netfilter/xt_dscp.h> |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 18 | |
| 19 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 20 | MODULE_DESCRIPTION("Xtables: DSCP/TOS field match"); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 21 | MODULE_LICENSE("GPL"); |
| 22 | MODULE_ALIAS("ipt_dscp"); |
| 23 | MODULE_ALIAS("ip6t_dscp"); |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 24 | MODULE_ALIAS("ipt_tos"); |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 25 | MODULE_ALIAS("ip6t_tos"); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 26 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 27 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 28 | dscp_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 29 | { |
Jan Engelhardt | f7108a20 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 30 | const struct xt_dscp_info *info = par->matchinfo; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 31 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
| 32 | |
| 33 | return (dscp == info->dscp) ^ !!info->invert; |
| 34 | } |
| 35 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 36 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 37 | dscp_mt6(const struct sk_buff *skb, struct xt_action_param *par) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 38 | { |
Jan Engelhardt | f7108a20 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 39 | const struct xt_dscp_info *info = par->matchinfo; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 40 | u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 41 | |
| 42 | return (dscp == info->dscp) ^ !!info->invert; |
| 43 | } |
| 44 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 45 | static int dscp_mt_check(const struct xt_mtchk_param *par) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 46 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 47 | const struct xt_dscp_info *info = par->matchinfo; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 48 | |
Florian Westphal | 0cc9501 | 2018-02-09 15:51:59 +0100 | [diff] [blame] | 49 | if (info->dscp > XT_DSCP_MAX) |
Jan Engelhardt | 4a5a5c7 | 2010-03-19 17:32:59 +0100 | [diff] [blame] | 50 | return -EDOM; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 51 | |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 52 | return 0; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 53 | } |
| 54 | |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 55 | static bool tos_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 56 | { |
Jan Engelhardt | f7108a20 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 57 | const struct xt_tos_match_info *info = par->matchinfo; |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 58 | |
Pablo Neira Ayuso | 613dbd9 | 2016-11-03 10:56:21 +0100 | [diff] [blame] | 59 | if (xt_family(par) == NFPROTO_IPV4) |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 60 | return ((ip_hdr(skb)->tos & info->tos_mask) == |
| 61 | info->tos_value) ^ !!info->invert; |
| 62 | else |
| 63 | return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) == |
| 64 | info->tos_value) ^ !!info->invert; |
| 65 | } |
| 66 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 67 | static struct xt_match dscp_mt_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 68 | { |
| 69 | .name = "dscp", |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 70 | .family = NFPROTO_IPV4, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 71 | .checkentry = dscp_mt_check, |
| 72 | .match = dscp_mt, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 73 | .matchsize = sizeof(struct xt_dscp_info), |
| 74 | .me = THIS_MODULE, |
| 75 | }, |
| 76 | { |
| 77 | .name = "dscp", |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 78 | .family = NFPROTO_IPV6, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 79 | .checkentry = dscp_mt_check, |
| 80 | .match = dscp_mt6, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 81 | .matchsize = sizeof(struct xt_dscp_info), |
| 82 | .me = THIS_MODULE, |
| 83 | }, |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 84 | { |
| 85 | .name = "tos", |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 86 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 87 | .family = NFPROTO_IPV4, |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 88 | .match = tos_mt, |
| 89 | .matchsize = sizeof(struct xt_tos_match_info), |
| 90 | .me = THIS_MODULE, |
| 91 | }, |
| 92 | { |
| 93 | .name = "tos", |
| 94 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 95 | .family = NFPROTO_IPV6, |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 96 | .match = tos_mt, |
| 97 | .matchsize = sizeof(struct xt_tos_match_info), |
| 98 | .me = THIS_MODULE, |
| 99 | }, |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 102 | static int __init dscp_mt_init(void) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 103 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 104 | return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 107 | static void __exit dscp_mt_exit(void) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 108 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 109 | xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 112 | module_init(dscp_mt_init); |
| 113 | module_exit(dscp_mt_exit); |