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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 | |
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 | 26 | #include <net/netfilter/nf_conntrack.h> |
b8f00ba2 | 27 | #include <net/netfilter/nf_conntrack_ecache.h> |
587aa641 PM |
28 | #include <linux/netfilter/x_tables.h> |
29 | #include <linux/netfilter/xt_connmark.h> | |
1da177e4 | 30 | |
3a4fa0a2 | 31 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
b8f00ba2 | 32 | MODULE_DESCRIPTION("Xtables: connection mark operations"); |
1da177e4 | 33 | MODULE_LICENSE("GPL"); |
b8f00ba2 JE |
34 | MODULE_ALIAS("ipt_CONNMARK"); |
35 | MODULE_ALIAS("ip6t_CONNMARK"); | |
2e4e6a17 | 36 | MODULE_ALIAS("ipt_connmark"); |
73aaf935 | 37 | MODULE_ALIAS("ip6t_connmark"); |
1da177e4 | 38 | |
b8f00ba2 | 39 | static unsigned int |
4b560b44 | 40 | connmark_tg(struct sk_buff *skb, const struct xt_action_param *par) |
b8f00ba2 JE |
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 | ||
135367b8 | 77 | static int connmark_tg_check(const struct xt_tgchk_param *par) |
b8f00ba2 | 78 | { |
4a5a5c73 JE |
79 | int ret; |
80 | ||
81 | ret = nf_ct_l3proto_try_module_get(par->family); | |
f95c74e3 | 82 | if (ret < 0) |
8bee4bad JE |
83 | pr_info("cannot load conntrack support for proto=%u\n", |
84 | par->family); | |
f95c74e3 | 85 | return ret; |
b8f00ba2 JE |
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 | ||
1d93a9cb | 93 | static bool |
62fc8051 | 94 | connmark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
96e32272 | 95 | { |
f7108a20 | 96 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
96e32272 JE |
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 | ||
b0f38452 | 107 | static int connmark_mt_check(const struct xt_mtchk_param *par) |
96e32272 | 108 | { |
4a5a5c73 JE |
109 | int ret; |
110 | ||
111 | ret = nf_ct_l3proto_try_module_get(par->family); | |
f95c74e3 | 112 | if (ret < 0) |
8bee4bad JE |
113 | pr_info("cannot load conntrack support for proto=%u\n", |
114 | par->family); | |
f95c74e3 | 115 | return ret; |
96e32272 JE |
116 | } |
117 | ||
6be3d859 | 118 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
b9f78f9f | 119 | { |
92f3b2b1 | 120 | nf_ct_l3proto_module_put(par->family); |
b9f78f9f PNA |
121 | } |
122 | ||
b8f00ba2 JE |
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 | ||
84899a2b JE |
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, | |
1da177e4 LT |
143 | }; |
144 | ||
d3c5ee6d | 145 | static int __init connmark_mt_init(void) |
1da177e4 | 146 | { |
b8f00ba2 JE |
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; | |
1da177e4 LT |
158 | } |
159 | ||
d3c5ee6d | 160 | static void __exit connmark_mt_exit(void) |
1da177e4 | 161 | { |
84899a2b | 162 | xt_unregister_match(&connmark_mt_reg); |
b8f00ba2 | 163 | xt_unregister_target(&connmark_tg_reg); |
1da177e4 LT |
164 | } |
165 | ||
d3c5ee6d JE |
166 | module_init(connmark_mt_init); |
167 | module_exit(connmark_mt_exit); |