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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 | |
31 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
32 | MODULE_DESCRIPTION("Xtables: connection mark operations"); |
33 | MODULE_LICENSE("GPL"); |
34 | MODULE_ALIAS("ipt_CONNMARK"); |
35 | MODULE_ALIAS("ip6t_CONNMARK"); |
36 | MODULE_ALIAS("ipt_connmark"); |
37 | MODULE_ALIAS("ip6t_connmark"); |
38 | |
39 | static unsigned int |
40 | connmark_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 | |
77 | static 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 | |
88 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
89 | { |
90 | nf_ct_l3proto_module_put(par->family); |
91 | } |
92 | |
93 | static bool |
94 | connmark_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 | |
107 | static 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 | |
118 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
119 | { |
120 | nf_ct_l3proto_module_put(par->family); |
121 | } |
122 | |
123 | static 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 | |
134 | static 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 | |
145 | static 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 | |
160 | static void __exit connmark_mt_exit(void) |
161 | { |
162 | xt_unregister_match(&connmark_mt_reg); |
163 | xt_unregister_target(&connmark_tg_reg); |
164 | } |
165 | |
166 | module_init(connmark_mt_init); |
167 | module_exit(connmark_mt_exit); |
168 |
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