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Commit | Line | Data |
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96e32272 JE |
1 | /* |
2 | * xt_connmark - Netfilter module to match connection mark values | |
1da177e4 | 3 | * |
96e32272 JE |
4 | * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> |
5 | * by Henrik Nordstrom <hno@marasystems.com> | |
6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
7 | * Jan Engelhardt <jengelh@computergmbh.de> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/skbuff.h> | |
587aa641 PM |
26 | #include <net/netfilter/nf_conntrack.h> |
27 | #include <linux/netfilter/x_tables.h> | |
28 | #include <linux/netfilter/xt_connmark.h> | |
1da177e4 | 29 | |
3a4fa0a2 | 30 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
2ae15b64 | 31 | MODULE_DESCRIPTION("Xtables: connection mark match"); |
1da177e4 | 32 | MODULE_LICENSE("GPL"); |
2e4e6a17 | 33 | MODULE_ALIAS("ipt_connmark"); |
73aaf935 | 34 | MODULE_ALIAS("ip6t_connmark"); |
1da177e4 | 35 | |
1d93a9cb | 36 | static bool |
f7108a20 | 37 | connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
96e32272 | 38 | { |
f7108a20 | 39 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
96e32272 JE |
40 | enum ip_conntrack_info ctinfo; |
41 | const struct nf_conn *ct; | |
42 | ||
43 | ct = nf_ct_get(skb, &ctinfo); | |
44 | if (ct == NULL) | |
45 | return false; | |
46 | ||
47 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; | |
48 | } | |
49 | ||
50 | static bool | |
f7108a20 | 51 | connmark_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
1da177e4 | 52 | { |
f7108a20 | 53 | const struct xt_connmark_info *info = par->matchinfo; |
a47362a2 | 54 | const struct nf_conn *ct; |
587aa641 PM |
55 | enum ip_conntrack_info ctinfo; |
56 | ||
57 | ct = nf_ct_get(skb, &ctinfo); | |
58 | if (!ct) | |
1d93a9cb | 59 | return false; |
1da177e4 | 60 | |
7c4e36bc | 61 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
62 | } |
63 | ||
9b4fce7a | 64 | static bool connmark_mt_check_v0(const struct xt_mtchk_param *par) |
1da177e4 | 65 | { |
9b4fce7a | 66 | const struct xt_connmark_info *cm = par->matchinfo; |
1da177e4 | 67 | |
bf3a46aa HW |
68 | if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { |
69 | printk(KERN_WARNING "connmark: only support 32bit mark\n"); | |
ccb79bdc | 70 | return false; |
bf3a46aa | 71 | } |
92f3b2b1 | 72 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
fe0b9294 | 73 | printk(KERN_WARNING "can't load conntrack support for " |
92f3b2b1 | 74 | "proto=%u\n", par->family); |
ccb79bdc | 75 | return false; |
b9f78f9f | 76 | } |
ccb79bdc | 77 | return true; |
1da177e4 LT |
78 | } |
79 | ||
9b4fce7a | 80 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
96e32272 | 81 | { |
92f3b2b1 | 82 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
96e32272 | 83 | printk(KERN_WARNING "cannot load conntrack support for " |
92f3b2b1 | 84 | "proto=%u\n", par->family); |
96e32272 JE |
85 | return false; |
86 | } | |
87 | return true; | |
88 | } | |
89 | ||
6be3d859 | 90 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
b9f78f9f | 91 | { |
92f3b2b1 | 92 | nf_ct_l3proto_module_put(par->family); |
b9f78f9f PNA |
93 | } |
94 | ||
f1eda053 PM |
95 | #ifdef CONFIG_COMPAT |
96 | struct compat_xt_connmark_info { | |
97 | compat_ulong_t mark, mask; | |
98 | u_int8_t invert; | |
99 | u_int8_t __pad1; | |
100 | u_int16_t __pad2; | |
101 | }; | |
102 | ||
96e32272 | 103 | static void connmark_mt_compat_from_user_v0(void *dst, void *src) |
f1eda053 | 104 | { |
a47362a2 | 105 | const struct compat_xt_connmark_info *cm = src; |
f1eda053 PM |
106 | struct xt_connmark_info m = { |
107 | .mark = cm->mark, | |
108 | .mask = cm->mask, | |
109 | .invert = cm->invert, | |
110 | }; | |
111 | memcpy(dst, &m, sizeof(m)); | |
112 | } | |
113 | ||
96e32272 | 114 | static int connmark_mt_compat_to_user_v0(void __user *dst, void *src) |
f1eda053 | 115 | { |
a47362a2 | 116 | const struct xt_connmark_info *m = src; |
f1eda053 PM |
117 | struct compat_xt_connmark_info cm = { |
118 | .mark = m->mark, | |
119 | .mask = m->mask, | |
120 | .invert = m->invert, | |
121 | }; | |
122 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
123 | } | |
124 | #endif /* CONFIG_COMPAT */ | |
125 | ||
d3c5ee6d | 126 | static struct xt_match connmark_mt_reg[] __read_mostly = { |
4470bbc7 PM |
127 | { |
128 | .name = "connmark", | |
96e32272 | 129 | .revision = 0, |
92f3b2b1 | 130 | .family = NFPROTO_UNSPEC, |
96e32272 JE |
131 | .checkentry = connmark_mt_check_v0, |
132 | .match = connmark_mt_v0, | |
d3c5ee6d | 133 | .destroy = connmark_mt_destroy, |
4470bbc7 | 134 | .matchsize = sizeof(struct xt_connmark_info), |
f1eda053 PM |
135 | #ifdef CONFIG_COMPAT |
136 | .compatsize = sizeof(struct compat_xt_connmark_info), | |
96e32272 JE |
137 | .compat_from_user = connmark_mt_compat_from_user_v0, |
138 | .compat_to_user = connmark_mt_compat_to_user_v0, | |
f1eda053 | 139 | #endif |
4470bbc7 PM |
140 | .me = THIS_MODULE |
141 | }, | |
96e32272 JE |
142 | { |
143 | .name = "connmark", | |
144 | .revision = 1, | |
92f3b2b1 | 145 | .family = NFPROTO_UNSPEC, |
96e32272 JE |
146 | .checkentry = connmark_mt_check, |
147 | .match = connmark_mt, | |
148 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
149 | .destroy = connmark_mt_destroy, | |
150 | .me = THIS_MODULE, | |
151 | }, | |
1da177e4 LT |
152 | }; |
153 | ||
d3c5ee6d | 154 | static int __init connmark_mt_init(void) |
1da177e4 | 155 | { |
d3c5ee6d JE |
156 | return xt_register_matches(connmark_mt_reg, |
157 | ARRAY_SIZE(connmark_mt_reg)); | |
1da177e4 LT |
158 | } |
159 | ||
d3c5ee6d | 160 | static void __exit connmark_mt_exit(void) |
1da177e4 | 161 | { |
d3c5ee6d | 162 | xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg)); |
1da177e4 LT |
163 | } |
164 | ||
d3c5ee6d JE |
165 | module_init(connmark_mt_init); |
166 | module_exit(connmark_mt_exit); |