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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 |
d3c5ee6d JE |
37 | connmark_mt(const struct sk_buff *skb, const struct net_device *in, |
38 | const struct net_device *out, const struct xt_match *match, | |
39 | const void *matchinfo, int offset, unsigned int protoff, | |
40 | bool *hotdrop) | |
96e32272 JE |
41 | { |
42 | const struct xt_connmark_mtinfo1 *info = matchinfo; | |
43 | enum ip_conntrack_info ctinfo; | |
44 | const struct nf_conn *ct; | |
45 | ||
46 | ct = nf_ct_get(skb, &ctinfo); | |
47 | if (ct == NULL) | |
48 | return false; | |
49 | ||
50 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; | |
51 | } | |
52 | ||
53 | static bool | |
54 | connmark_mt_v0(const struct sk_buff *skb, const struct net_device *in, | |
55 | const struct net_device *out, const struct xt_match *match, | |
56 | const void *matchinfo, int offset, unsigned int protoff, | |
57 | bool *hotdrop) | |
1da177e4 | 58 | { |
2e4e6a17 | 59 | const struct xt_connmark_info *info = matchinfo; |
a47362a2 | 60 | const struct nf_conn *ct; |
587aa641 PM |
61 | enum ip_conntrack_info ctinfo; |
62 | ||
63 | ct = nf_ct_get(skb, &ctinfo); | |
64 | if (!ct) | |
1d93a9cb | 65 | return false; |
1da177e4 | 66 | |
7c4e36bc | 67 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
68 | } |
69 | ||
ccb79bdc | 70 | static bool |
96e32272 JE |
71 | connmark_mt_check_v0(const char *tablename, const void *ip, |
72 | const struct xt_match *match, void *matchinfo, | |
73 | unsigned int hook_mask) | |
1da177e4 | 74 | { |
a47362a2 | 75 | const struct xt_connmark_info *cm = matchinfo; |
1da177e4 | 76 | |
bf3a46aa HW |
77 | if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { |
78 | printk(KERN_WARNING "connmark: only support 32bit mark\n"); | |
ccb79bdc | 79 | return false; |
bf3a46aa | 80 | } |
b9f78f9f | 81 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { |
fe0b9294 | 82 | printk(KERN_WARNING "can't load conntrack support for " |
df54aae0 | 83 | "proto=%u\n", match->family); |
ccb79bdc | 84 | return false; |
b9f78f9f | 85 | } |
ccb79bdc | 86 | return true; |
1da177e4 LT |
87 | } |
88 | ||
96e32272 JE |
89 | static bool |
90 | connmark_mt_check(const char *tablename, const void *ip, | |
91 | const struct xt_match *match, void *matchinfo, | |
92 | unsigned int hook_mask) | |
93 | { | |
94 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { | |
95 | printk(KERN_WARNING "cannot load conntrack support for " | |
96 | "proto=%u\n", match->family); | |
97 | return false; | |
98 | } | |
99 | return true; | |
100 | } | |
101 | ||
b9f78f9f | 102 | static void |
d3c5ee6d | 103 | connmark_mt_destroy(const struct xt_match *match, void *matchinfo) |
b9f78f9f | 104 | { |
b9f78f9f | 105 | nf_ct_l3proto_module_put(match->family); |
b9f78f9f PNA |
106 | } |
107 | ||
f1eda053 PM |
108 | #ifdef CONFIG_COMPAT |
109 | struct compat_xt_connmark_info { | |
110 | compat_ulong_t mark, mask; | |
111 | u_int8_t invert; | |
112 | u_int8_t __pad1; | |
113 | u_int16_t __pad2; | |
114 | }; | |
115 | ||
96e32272 | 116 | static void connmark_mt_compat_from_user_v0(void *dst, void *src) |
f1eda053 | 117 | { |
a47362a2 | 118 | const struct compat_xt_connmark_info *cm = src; |
f1eda053 PM |
119 | struct xt_connmark_info m = { |
120 | .mark = cm->mark, | |
121 | .mask = cm->mask, | |
122 | .invert = cm->invert, | |
123 | }; | |
124 | memcpy(dst, &m, sizeof(m)); | |
125 | } | |
126 | ||
96e32272 | 127 | static int connmark_mt_compat_to_user_v0(void __user *dst, void *src) |
f1eda053 | 128 | { |
a47362a2 | 129 | const struct xt_connmark_info *m = src; |
f1eda053 PM |
130 | struct compat_xt_connmark_info cm = { |
131 | .mark = m->mark, | |
132 | .mask = m->mask, | |
133 | .invert = m->invert, | |
134 | }; | |
135 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
136 | } | |
137 | #endif /* CONFIG_COMPAT */ | |
138 | ||
d3c5ee6d | 139 | static struct xt_match connmark_mt_reg[] __read_mostly = { |
4470bbc7 PM |
140 | { |
141 | .name = "connmark", | |
96e32272 | 142 | .revision = 0, |
ee999d8b | 143 | .family = NFPROTO_IPV4, |
96e32272 JE |
144 | .checkentry = connmark_mt_check_v0, |
145 | .match = connmark_mt_v0, | |
d3c5ee6d | 146 | .destroy = connmark_mt_destroy, |
4470bbc7 | 147 | .matchsize = sizeof(struct xt_connmark_info), |
f1eda053 PM |
148 | #ifdef CONFIG_COMPAT |
149 | .compatsize = sizeof(struct compat_xt_connmark_info), | |
96e32272 JE |
150 | .compat_from_user = connmark_mt_compat_from_user_v0, |
151 | .compat_to_user = connmark_mt_compat_to_user_v0, | |
f1eda053 | 152 | #endif |
4470bbc7 PM |
153 | .me = THIS_MODULE |
154 | }, | |
155 | { | |
156 | .name = "connmark", | |
96e32272 | 157 | .revision = 0, |
ee999d8b | 158 | .family = NFPROTO_IPV6, |
96e32272 JE |
159 | .checkentry = connmark_mt_check_v0, |
160 | .match = connmark_mt_v0, | |
d3c5ee6d | 161 | .destroy = connmark_mt_destroy, |
4470bbc7 | 162 | .matchsize = sizeof(struct xt_connmark_info), |
34f4c429 PM |
163 | #ifdef CONFIG_COMPAT |
164 | .compatsize = sizeof(struct compat_xt_connmark_info), | |
96e32272 JE |
165 | .compat_from_user = connmark_mt_compat_from_user_v0, |
166 | .compat_to_user = connmark_mt_compat_to_user_v0, | |
34f4c429 | 167 | #endif |
4470bbc7 PM |
168 | .me = THIS_MODULE |
169 | }, | |
96e32272 JE |
170 | { |
171 | .name = "connmark", | |
172 | .revision = 1, | |
ee999d8b | 173 | .family = NFPROTO_IPV4, |
96e32272 JE |
174 | .checkentry = connmark_mt_check, |
175 | .match = connmark_mt, | |
176 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
177 | .destroy = connmark_mt_destroy, | |
178 | .me = THIS_MODULE, | |
179 | }, | |
180 | { | |
181 | .name = "connmark", | |
182 | .revision = 1, | |
ee999d8b | 183 | .family = NFPROTO_IPV6, |
96e32272 JE |
184 | .checkentry = connmark_mt_check, |
185 | .match = connmark_mt, | |
186 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
187 | .destroy = connmark_mt_destroy, | |
188 | .me = THIS_MODULE, | |
189 | }, | |
1da177e4 LT |
190 | }; |
191 | ||
d3c5ee6d | 192 | static int __init connmark_mt_init(void) |
1da177e4 | 193 | { |
d3c5ee6d JE |
194 | return xt_register_matches(connmark_mt_reg, |
195 | ARRAY_SIZE(connmark_mt_reg)); | |
1da177e4 LT |
196 | } |
197 | ||
d3c5ee6d | 198 | static void __exit connmark_mt_exit(void) |
1da177e4 | 199 | { |
d3c5ee6d | 200 | xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg)); |
1da177e4 LT |
201 | } |
202 | ||
d3c5ee6d JE |
203 | module_init(connmark_mt_init); |
204 | module_exit(connmark_mt_exit); |