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 | */ |
| 9 | |
| 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> |
| 18 | #include <linux/netfilter_ipv4/ipt_tos.h> |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 19 | |
| 20 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 21 | MODULE_DESCRIPTION("Xtables: DSCP/TOS field match"); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 22 | MODULE_LICENSE("GPL"); |
| 23 | MODULE_ALIAS("ipt_dscp"); |
| 24 | MODULE_ALIAS("ip6t_dscp"); |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 25 | MODULE_ALIAS("ipt_tos"); |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 26 | MODULE_ALIAS("ip6t_tos"); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 27 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 28 | static bool |
| 29 | dscp_mt(const struct sk_buff *skb, const struct net_device *in, |
| 30 | const struct net_device *out, const struct xt_match *match, |
| 31 | const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 32 | { |
| 33 | const struct xt_dscp_info *info = matchinfo; |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 34 | u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT; |
| 35 | |
| 36 | return (dscp == info->dscp) ^ !!info->invert; |
| 37 | } |
| 38 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 39 | static bool |
| 40 | dscp_mt6(const struct sk_buff *skb, const struct net_device *in, |
| 41 | const struct net_device *out, const struct xt_match *match, |
| 42 | const void *matchinfo, int offset, unsigned int protoff, |
| 43 | bool *hotdrop) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 44 | { |
| 45 | const struct xt_dscp_info *info = matchinfo; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 46 | 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] | 47 | |
| 48 | return (dscp == info->dscp) ^ !!info->invert; |
| 49 | } |
| 50 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 51 | static bool |
| 52 | dscp_mt_check(const char *tablename, const void *info, |
| 53 | const struct xt_match *match, void *matchinfo, |
| 54 | unsigned int hook_mask) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 55 | { |
| 56 | const u_int8_t dscp = ((struct xt_dscp_info *)matchinfo)->dscp; |
| 57 | |
| 58 | if (dscp > XT_DSCP_MAX) { |
| 59 | printk(KERN_ERR "xt_dscp: dscp %x out of range\n", dscp); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 60 | return false; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 63 | return true; |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 64 | } |
| 65 | |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 66 | static bool tos_mt_v0(const struct sk_buff *skb, const struct net_device *in, |
| 67 | const struct net_device *out, |
| 68 | const struct xt_match *match, const void *matchinfo, |
| 69 | int offset, unsigned int protoff, bool *hotdrop) |
| 70 | { |
| 71 | const struct ipt_tos_info *info = matchinfo; |
| 72 | |
| 73 | return (ip_hdr(skb)->tos == info->tos) ^ info->invert; |
| 74 | } |
| 75 | |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 76 | static bool tos_mt(const struct sk_buff *skb, const struct net_device *in, |
| 77 | const struct net_device *out, const struct xt_match *match, |
| 78 | const void *matchinfo, int offset, unsigned int protoff, |
| 79 | bool *hotdrop) |
| 80 | { |
| 81 | const struct xt_tos_match_info *info = matchinfo; |
| 82 | |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 83 | if (match->family == NFPROTO_IPV4) |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 84 | return ((ip_hdr(skb)->tos & info->tos_mask) == |
| 85 | info->tos_value) ^ !!info->invert; |
| 86 | else |
| 87 | return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) == |
| 88 | info->tos_value) ^ !!info->invert; |
| 89 | } |
| 90 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 91 | static struct xt_match dscp_mt_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 92 | { |
| 93 | .name = "dscp", |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 94 | .family = NFPROTO_IPV4, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 95 | .checkentry = dscp_mt_check, |
| 96 | .match = dscp_mt, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 97 | .matchsize = sizeof(struct xt_dscp_info), |
| 98 | .me = THIS_MODULE, |
| 99 | }, |
| 100 | { |
| 101 | .name = "dscp", |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 102 | .family = NFPROTO_IPV6, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 103 | .checkentry = dscp_mt_check, |
| 104 | .match = dscp_mt6, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 105 | .matchsize = sizeof(struct xt_dscp_info), |
| 106 | .me = THIS_MODULE, |
| 107 | }, |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 108 | { |
| 109 | .name = "tos", |
| 110 | .revision = 0, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 111 | .family = NFPROTO_IPV4, |
Jan Engelhardt | c3b33e6 | 2007-12-04 23:37:54 -0800 | [diff] [blame] | 112 | .match = tos_mt_v0, |
| 113 | .matchsize = sizeof(struct ipt_tos_info), |
| 114 | .me = THIS_MODULE, |
| 115 | }, |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 116 | { |
| 117 | .name = "tos", |
| 118 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 119 | .family = NFPROTO_IPV4, |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 120 | .match = tos_mt, |
| 121 | .matchsize = sizeof(struct xt_tos_match_info), |
| 122 | .me = THIS_MODULE, |
| 123 | }, |
| 124 | { |
| 125 | .name = "tos", |
| 126 | .revision = 1, |
Jan Engelhardt | ee999d8 | 2008-10-08 11:35:01 +0200 | [diff] [blame^] | 127 | .family = NFPROTO_IPV6, |
Jan Engelhardt | f1095ab | 2007-12-04 23:38:30 -0800 | [diff] [blame] | 128 | .match = tos_mt, |
| 129 | .matchsize = sizeof(struct xt_tos_match_info), |
| 130 | .me = THIS_MODULE, |
| 131 | }, |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 132 | }; |
| 133 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 134 | static int __init dscp_mt_init(void) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 135 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 136 | return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 139 | static void __exit dscp_mt_exit(void) |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 140 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 141 | xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg)); |
Yasuyuki Kozakai | 9ba1627 | 2006-08-22 00:29:37 -0700 | [diff] [blame] | 142 | } |
| 143 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 144 | module_init(dscp_mt_init); |
| 145 | module_exit(dscp_mt_exit); |