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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> | |
24 | ||
25 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>"); | |
26 | MODULE_DESCRIPTION("IP tables connmark match module"); | |
27 | MODULE_LICENSE("GPL"); | |
2e4e6a17 | 28 | MODULE_ALIAS("ipt_connmark"); |
1da177e4 | 29 | |
2e4e6a17 HW |
30 | #include <linux/netfilter/x_tables.h> |
31 | #include <linux/netfilter/xt_connmark.h> | |
9fb9cbb1 | 32 | #include <net/netfilter/nf_conntrack_compat.h> |
1da177e4 LT |
33 | |
34 | static int | |
35 | match(const struct sk_buff *skb, | |
36 | const struct net_device *in, | |
37 | const struct net_device *out, | |
c4986734 | 38 | const struct xt_match *match, |
1da177e4 LT |
39 | const void *matchinfo, |
40 | int offset, | |
2e4e6a17 | 41 | unsigned int protoff, |
1da177e4 LT |
42 | int *hotdrop) |
43 | { | |
2e4e6a17 | 44 | const struct xt_connmark_info *info = matchinfo; |
9fb9cbb1 YK |
45 | u_int32_t ctinfo; |
46 | const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo); | |
47 | if (!ctmark) | |
1da177e4 LT |
48 | return 0; |
49 | ||
9fb9cbb1 | 50 | return (((*ctmark) & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
51 | } |
52 | ||
53 | static int | |
54 | checkentry(const char *tablename, | |
2e4e6a17 | 55 | const void *ip, |
c4986734 | 56 | const struct xt_match *match, |
1da177e4 LT |
57 | void *matchinfo, |
58 | unsigned int matchsize, | |
59 | unsigned int hook_mask) | |
60 | { | |
5d04bff0 | 61 | struct xt_connmark_info *cm = (struct xt_connmark_info *)matchinfo; |
1da177e4 | 62 | |
bf3a46aa HW |
63 | if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { |
64 | printk(KERN_WARNING "connmark: only support 32bit mark\n"); | |
65 | return 0; | |
66 | } | |
b9f78f9f PNA |
67 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
68 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { | |
69 | printk(KERN_WARNING "can't load nf_conntrack support for " | |
70 | "proto=%d\n", match->family); | |
71 | return 0; | |
72 | } | |
73 | #endif | |
1da177e4 LT |
74 | return 1; |
75 | } | |
76 | ||
b9f78f9f PNA |
77 | static void |
78 | destroy(const struct xt_match *match, void *matchinfo, unsigned int matchsize) | |
79 | { | |
80 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
81 | nf_ct_l3proto_module_put(match->family); | |
82 | #endif | |
83 | } | |
84 | ||
2e4e6a17 | 85 | static struct xt_match connmark_match = { |
5d04bff0 PM |
86 | .name = "connmark", |
87 | .match = match, | |
88 | .matchsize = sizeof(struct xt_connmark_info), | |
89 | .checkentry = checkentry, | |
b9f78f9f | 90 | .destroy = destroy, |
a45049c5 | 91 | .family = AF_INET, |
5d04bff0 | 92 | .me = THIS_MODULE |
2e4e6a17 | 93 | }; |
5d04bff0 | 94 | |
2e4e6a17 | 95 | static struct xt_match connmark6_match = { |
5d04bff0 PM |
96 | .name = "connmark", |
97 | .match = match, | |
98 | .matchsize = sizeof(struct xt_connmark_info), | |
99 | .checkentry = checkentry, | |
b9f78f9f | 100 | .destroy = destroy, |
a45049c5 | 101 | .family = AF_INET6, |
5d04bff0 | 102 | .me = THIS_MODULE |
1da177e4 LT |
103 | }; |
104 | ||
65b4b4e8 | 105 | static int __init xt_connmark_init(void) |
1da177e4 | 106 | { |
2e4e6a17 HW |
107 | int ret; |
108 | ||
109 | need_conntrack(); | |
110 | ||
a45049c5 | 111 | ret = xt_register_match(&connmark_match); |
2e4e6a17 HW |
112 | if (ret) |
113 | return ret; | |
114 | ||
a45049c5 | 115 | ret = xt_register_match(&connmark6_match); |
2e4e6a17 | 116 | if (ret) |
a45049c5 | 117 | xt_unregister_match(&connmark_match); |
2e4e6a17 | 118 | return ret; |
1da177e4 LT |
119 | } |
120 | ||
65b4b4e8 | 121 | static void __exit xt_connmark_fini(void) |
1da177e4 | 122 | { |
a45049c5 PNA |
123 | xt_unregister_match(&connmark6_match); |
124 | xt_unregister_match(&connmark_match); | |
1da177e4 LT |
125 | } |
126 | ||
65b4b4e8 AM |
127 | module_init(xt_connmark_init); |
128 | module_exit(xt_connmark_fini); |