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1da177e4 LT |
1 | /* This kernel module matches connection mark values set by the |
2 | * CONNMARK target | |
3 | * | |
4 | * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> | |
5 | * by Henrik Nordstrom <hno@marasystems.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/skbuff.h> | |
587aa641 PM |
24 | #include <net/netfilter/nf_conntrack.h> |
25 | #include <linux/netfilter/x_tables.h> | |
26 | #include <linux/netfilter/xt_connmark.h> | |
1da177e4 | 27 | |
3a4fa0a2 | 28 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
1da177e4 LT |
29 | MODULE_DESCRIPTION("IP tables connmark match module"); |
30 | MODULE_LICENSE("GPL"); | |
2e4e6a17 | 31 | MODULE_ALIAS("ipt_connmark"); |
73aaf935 | 32 | MODULE_ALIAS("ip6t_connmark"); |
1da177e4 | 33 | |
1d93a9cb | 34 | static bool |
d3c5ee6d JE |
35 | connmark_mt(const struct sk_buff *skb, const struct net_device *in, |
36 | const struct net_device *out, const struct xt_match *match, | |
37 | const void *matchinfo, int offset, unsigned int protoff, | |
38 | bool *hotdrop) | |
1da177e4 | 39 | { |
2e4e6a17 | 40 | const struct xt_connmark_info *info = matchinfo; |
a47362a2 | 41 | const struct nf_conn *ct; |
587aa641 PM |
42 | enum ip_conntrack_info ctinfo; |
43 | ||
44 | ct = nf_ct_get(skb, &ctinfo); | |
45 | if (!ct) | |
1d93a9cb | 46 | return false; |
1da177e4 | 47 | |
7c4e36bc | 48 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
49 | } |
50 | ||
ccb79bdc | 51 | static bool |
d3c5ee6d JE |
52 | connmark_mt_check(const char *tablename, const void *ip, |
53 | const struct xt_match *match, void *matchinfo, | |
54 | unsigned int hook_mask) | |
1da177e4 | 55 | { |
a47362a2 | 56 | const struct xt_connmark_info *cm = matchinfo; |
1da177e4 | 57 | |
bf3a46aa HW |
58 | if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { |
59 | printk(KERN_WARNING "connmark: only support 32bit mark\n"); | |
ccb79bdc | 60 | return false; |
bf3a46aa | 61 | } |
b9f78f9f | 62 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { |
fe0b9294 | 63 | printk(KERN_WARNING "can't load conntrack support for " |
df54aae0 | 64 | "proto=%u\n", match->family); |
ccb79bdc | 65 | return false; |
b9f78f9f | 66 | } |
ccb79bdc | 67 | return true; |
1da177e4 LT |
68 | } |
69 | ||
b9f78f9f | 70 | static void |
d3c5ee6d | 71 | connmark_mt_destroy(const struct xt_match *match, void *matchinfo) |
b9f78f9f | 72 | { |
b9f78f9f | 73 | nf_ct_l3proto_module_put(match->family); |
b9f78f9f PNA |
74 | } |
75 | ||
f1eda053 PM |
76 | #ifdef CONFIG_COMPAT |
77 | struct compat_xt_connmark_info { | |
78 | compat_ulong_t mark, mask; | |
79 | u_int8_t invert; | |
80 | u_int8_t __pad1; | |
81 | u_int16_t __pad2; | |
82 | }; | |
83 | ||
d3c5ee6d | 84 | static void connmark_mt_compat_from_user(void *dst, void *src) |
f1eda053 | 85 | { |
a47362a2 | 86 | const struct compat_xt_connmark_info *cm = src; |
f1eda053 PM |
87 | struct xt_connmark_info m = { |
88 | .mark = cm->mark, | |
89 | .mask = cm->mask, | |
90 | .invert = cm->invert, | |
91 | }; | |
92 | memcpy(dst, &m, sizeof(m)); | |
93 | } | |
94 | ||
d3c5ee6d | 95 | static int connmark_mt_compat_to_user(void __user *dst, void *src) |
f1eda053 | 96 | { |
a47362a2 | 97 | const struct xt_connmark_info *m = src; |
f1eda053 PM |
98 | struct compat_xt_connmark_info cm = { |
99 | .mark = m->mark, | |
100 | .mask = m->mask, | |
101 | .invert = m->invert, | |
102 | }; | |
103 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
104 | } | |
105 | #endif /* CONFIG_COMPAT */ | |
106 | ||
d3c5ee6d | 107 | static struct xt_match connmark_mt_reg[] __read_mostly = { |
4470bbc7 PM |
108 | { |
109 | .name = "connmark", | |
110 | .family = AF_INET, | |
d3c5ee6d JE |
111 | .checkentry = connmark_mt_check, |
112 | .match = connmark_mt, | |
113 | .destroy = connmark_mt_destroy, | |
4470bbc7 | 114 | .matchsize = sizeof(struct xt_connmark_info), |
f1eda053 PM |
115 | #ifdef CONFIG_COMPAT |
116 | .compatsize = sizeof(struct compat_xt_connmark_info), | |
d3c5ee6d JE |
117 | .compat_from_user = connmark_mt_compat_from_user, |
118 | .compat_to_user = connmark_mt_compat_to_user, | |
f1eda053 | 119 | #endif |
4470bbc7 PM |
120 | .me = THIS_MODULE |
121 | }, | |
122 | { | |
123 | .name = "connmark", | |
124 | .family = AF_INET6, | |
d3c5ee6d JE |
125 | .checkentry = connmark_mt_check, |
126 | .match = connmark_mt, | |
127 | .destroy = connmark_mt_destroy, | |
4470bbc7 | 128 | .matchsize = sizeof(struct xt_connmark_info), |
34f4c429 PM |
129 | #ifdef CONFIG_COMPAT |
130 | .compatsize = sizeof(struct compat_xt_connmark_info), | |
131 | .compat_from_user = connmark_mt_compat_from_user, | |
132 | .compat_to_user = connmark_mt_compat_to_user, | |
133 | #endif | |
4470bbc7 PM |
134 | .me = THIS_MODULE |
135 | }, | |
1da177e4 LT |
136 | }; |
137 | ||
d3c5ee6d | 138 | static int __init connmark_mt_init(void) |
1da177e4 | 139 | { |
d3c5ee6d JE |
140 | return xt_register_matches(connmark_mt_reg, |
141 | ARRAY_SIZE(connmark_mt_reg)); | |
1da177e4 LT |
142 | } |
143 | ||
d3c5ee6d | 144 | static void __exit connmark_mt_exit(void) |
1da177e4 | 145 | { |
d3c5ee6d | 146 | xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg)); |
1da177e4 LT |
147 | } |
148 | ||
d3c5ee6d JE |
149 | module_init(connmark_mt_init); |
150 | module_exit(connmark_mt_exit); |