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1/*
2 * xt_connmark - Netfilter module to operate on connection marks
3 *
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@medozas.de>
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>
26#include <net/netfilter/nf_conntrack.h>
27#include <net/netfilter/nf_conntrack_ecache.h>
28#include <linux/netfilter/x_tables.h>
29#include <linux/netfilter/xt_connmark.h>
30
31MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
32MODULE_DESCRIPTION("Xtables: connection mark operations");
33MODULE_LICENSE("GPL");
34MODULE_ALIAS("ipt_CONNMARK");
35MODULE_ALIAS("ip6t_CONNMARK");
36MODULE_ALIAS("ipt_connmark");
37MODULE_ALIAS("ip6t_connmark");
38
39static unsigned int
40connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
41{
42 const struct xt_connmark_tginfo1 *info = par->targinfo;
43 enum ip_conntrack_info ctinfo;
44 struct nf_conn *ct;
45 u_int32_t newmark;
46
47 ct = nf_ct_get(skb, &ctinfo);
48 if (ct == NULL)
49 return XT_CONTINUE;
50
51 switch (info->mode) {
52 case XT_CONNMARK_SET:
53 newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
54 if (ct->mark != newmark) {
55 ct->mark = newmark;
56 nf_conntrack_event_cache(IPCT_MARK, ct);
57 }
58 break;
59 case XT_CONNMARK_SAVE:
60 newmark = (ct->mark & ~info->ctmask) ^
61 (skb->mark & info->nfmask);
62 if (ct->mark != newmark) {
63 ct->mark = newmark;
64 nf_conntrack_event_cache(IPCT_MARK, ct);
65 }
66 break;
67 case XT_CONNMARK_RESTORE:
68 newmark = (skb->mark & ~info->nfmask) ^
69 (ct->mark & info->ctmask);
70 skb->mark = newmark;
71 break;
72 }
73
74 return XT_CONTINUE;
75}
76
77static int connmark_tg_check(const struct xt_tgchk_param *par)
78{
79 int ret;
80
81 ret = nf_ct_l3proto_try_module_get(par->family);
82 if (ret < 0)
83 pr_info("cannot load conntrack support for proto=%u\n",
84 par->family);
85 return ret;
86}
87
88static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
89{
90 nf_ct_l3proto_module_put(par->family);
91}
92
93static bool
94connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
95{
96 const struct xt_connmark_mtinfo1 *info = par->matchinfo;
97 enum ip_conntrack_info ctinfo;
98 const struct nf_conn *ct;
99
100 ct = nf_ct_get(skb, &ctinfo);
101 if (ct == NULL)
102 return false;
103
104 return ((ct->mark & info->mask) == info->mark) ^ info->invert;
105}
106
107static int connmark_mt_check(const struct xt_mtchk_param *par)
108{
109 int ret;
110
111 ret = nf_ct_l3proto_try_module_get(par->family);
112 if (ret < 0)
113 pr_info("cannot load conntrack support for proto=%u\n",
114 par->family);
115 return ret;
116}
117
118static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
119{
120 nf_ct_l3proto_module_put(par->family);
121}
122
123static struct xt_target connmark_tg_reg __read_mostly = {
124 .name = "CONNMARK",
125 .revision = 1,
126 .family = NFPROTO_UNSPEC,
127 .checkentry = connmark_tg_check,
128 .target = connmark_tg,
129 .targetsize = sizeof(struct xt_connmark_tginfo1),
130 .destroy = connmark_tg_destroy,
131 .me = THIS_MODULE,
132};
133
134static struct xt_match connmark_mt_reg __read_mostly = {
135 .name = "connmark",
136 .revision = 1,
137 .family = NFPROTO_UNSPEC,
138 .checkentry = connmark_mt_check,
139 .match = connmark_mt,
140 .matchsize = sizeof(struct xt_connmark_mtinfo1),
141 .destroy = connmark_mt_destroy,
142 .me = THIS_MODULE,
143};
144
145static int __init connmark_mt_init(void)
146{
147 int ret;
148
149 ret = xt_register_target(&connmark_tg_reg);
150 if (ret < 0)
151 return ret;
152 ret = xt_register_match(&connmark_mt_reg);
153 if (ret < 0) {
154 xt_unregister_target(&connmark_tg_reg);
155 return ret;
156 }
157 return 0;
158}
159
160static void __exit connmark_mt_exit(void)
161{
162 xt_unregister_match(&connmark_mt_reg);
163 xt_unregister_target(&connmark_tg_reg);
164}
165
166module_init(connmark_mt_init);
167module_exit(connmark_mt_exit);