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Commit | Line | Data |
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96e32272 | 1 | /* |
b8f00ba2 | 2 | * xt_connmark - Netfilter module to operate on connection marks |
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 | |
408ffaa4 | 7 | * Jan Engelhardt <jengelh@medozas.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 | |
e664eabd | 20 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/skbuff.h> | |
587aa641 | 25 | #include <net/netfilter/nf_conntrack.h> |
b8f00ba2 | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
587aa641 PM |
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>"); |
b8f00ba2 | 31 | MODULE_DESCRIPTION("Xtables: connection mark operations"); |
1da177e4 | 32 | MODULE_LICENSE("GPL"); |
b8f00ba2 JE |
33 | MODULE_ALIAS("ipt_CONNMARK"); |
34 | MODULE_ALIAS("ip6t_CONNMARK"); | |
2e4e6a17 | 35 | MODULE_ALIAS("ipt_connmark"); |
73aaf935 | 36 | MODULE_ALIAS("ip6t_connmark"); |
1da177e4 | 37 | |
b8f00ba2 | 38 | static unsigned int |
4b560b44 | 39 | connmark_tg(struct sk_buff *skb, const struct xt_action_param *par) |
b8f00ba2 JE |
40 | { |
41 | const struct xt_connmark_tginfo1 *info = par->targinfo; | |
42 | enum ip_conntrack_info ctinfo; | |
43 | struct nf_conn *ct; | |
44 | u_int32_t newmark; | |
45 | ||
46 | ct = nf_ct_get(skb, &ctinfo); | |
ab8bc7ed | 47 | if (ct == NULL) |
b8f00ba2 JE |
48 | return XT_CONTINUE; |
49 | ||
50 | switch (info->mode) { | |
51 | case XT_CONNMARK_SET: | |
52 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; | |
53 | if (ct->mark != newmark) { | |
54 | ct->mark = newmark; | |
55 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
56 | } | |
57 | break; | |
58 | case XT_CONNMARK_SAVE: | |
59 | newmark = (ct->mark & ~info->ctmask) ^ | |
60 | (skb->mark & info->nfmask); | |
61 | if (ct->mark != newmark) { | |
62 | ct->mark = newmark; | |
63 | nf_conntrack_event_cache(IPCT_MARK, ct); | |
64 | } | |
65 | break; | |
66 | case XT_CONNMARK_RESTORE: | |
67 | newmark = (skb->mark & ~info->nfmask) ^ | |
68 | (ct->mark & info->ctmask); | |
69 | skb->mark = newmark; | |
70 | break; | |
71 | } | |
72 | ||
73 | return XT_CONTINUE; | |
74 | } | |
75 | ||
135367b8 | 76 | static int connmark_tg_check(const struct xt_tgchk_param *par) |
b8f00ba2 | 77 | { |
4a5a5c73 JE |
78 | int ret; |
79 | ||
ecb2421b | 80 | ret = nf_ct_netns_get(par->net, par->family); |
f95c74e3 | 81 | if (ret < 0) |
8bee4bad JE |
82 | pr_info("cannot load conntrack support for proto=%u\n", |
83 | par->family); | |
f95c74e3 | 84 | return ret; |
b8f00ba2 JE |
85 | } |
86 | ||
87 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) | |
88 | { | |
ecb2421b | 89 | nf_ct_netns_put(par->net, par->family); |
b8f00ba2 JE |
90 | } |
91 | ||
1d93a9cb | 92 | static bool |
62fc8051 | 93 | connmark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
96e32272 | 94 | { |
f7108a20 | 95 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
96e32272 JE |
96 | enum ip_conntrack_info ctinfo; |
97 | const struct nf_conn *ct; | |
98 | ||
99 | ct = nf_ct_get(skb, &ctinfo); | |
ab8bc7ed | 100 | if (ct == NULL) |
96e32272 JE |
101 | return false; |
102 | ||
103 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; | |
104 | } | |
105 | ||
b0f38452 | 106 | static int connmark_mt_check(const struct xt_mtchk_param *par) |
96e32272 | 107 | { |
4a5a5c73 JE |
108 | int ret; |
109 | ||
ecb2421b | 110 | ret = nf_ct_netns_get(par->net, par->family); |
f95c74e3 | 111 | if (ret < 0) |
8bee4bad JE |
112 | pr_info("cannot load conntrack support for proto=%u\n", |
113 | par->family); | |
f95c74e3 | 114 | return ret; |
96e32272 JE |
115 | } |
116 | ||
6be3d859 | 117 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
b9f78f9f | 118 | { |
ecb2421b | 119 | nf_ct_netns_put(par->net, par->family); |
b9f78f9f PNA |
120 | } |
121 | ||
b8f00ba2 JE |
122 | static struct xt_target connmark_tg_reg __read_mostly = { |
123 | .name = "CONNMARK", | |
124 | .revision = 1, | |
125 | .family = NFPROTO_UNSPEC, | |
126 | .checkentry = connmark_tg_check, | |
127 | .target = connmark_tg, | |
128 | .targetsize = sizeof(struct xt_connmark_tginfo1), | |
129 | .destroy = connmark_tg_destroy, | |
130 | .me = THIS_MODULE, | |
131 | }; | |
132 | ||
84899a2b JE |
133 | static struct xt_match connmark_mt_reg __read_mostly = { |
134 | .name = "connmark", | |
135 | .revision = 1, | |
136 | .family = NFPROTO_UNSPEC, | |
137 | .checkentry = connmark_mt_check, | |
138 | .match = connmark_mt, | |
139 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
140 | .destroy = connmark_mt_destroy, | |
141 | .me = THIS_MODULE, | |
1da177e4 LT |
142 | }; |
143 | ||
d3c5ee6d | 144 | static int __init connmark_mt_init(void) |
1da177e4 | 145 | { |
b8f00ba2 JE |
146 | int ret; |
147 | ||
148 | ret = xt_register_target(&connmark_tg_reg); | |
149 | if (ret < 0) | |
150 | return ret; | |
151 | ret = xt_register_match(&connmark_mt_reg); | |
152 | if (ret < 0) { | |
153 | xt_unregister_target(&connmark_tg_reg); | |
154 | return ret; | |
155 | } | |
156 | return 0; | |
1da177e4 LT |
157 | } |
158 | ||
d3c5ee6d | 159 | static void __exit connmark_mt_exit(void) |
1da177e4 | 160 | { |
84899a2b | 161 | xt_unregister_match(&connmark_mt_reg); |
b8f00ba2 | 162 | xt_unregister_target(&connmark_tg_reg); |
1da177e4 LT |
163 | } |
164 | ||
d3c5ee6d JE |
165 | module_init(connmark_mt_init); |
166 | module_exit(connmark_mt_exit); |