Commit | Line | Data |
---|---|---|
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 JE |
39 | static unsigned int |
40 | connmark_tg(struct sk_buff *skb, const struct xt_target_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 bool connmark_tg_check(const struct xt_tgchk_param *par) | |
78 | { | |
79 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { | |
8bee4bad JE |
80 | pr_info("cannot load conntrack support for proto=%u\n", |
81 | par->family); | |
b8f00ba2 JE |
82 | return false; |
83 | } | |
84 | return true; | |
85 | } | |
86 | ||
87 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) | |
88 | { | |
89 | nf_ct_l3proto_module_put(par->family); | |
90 | } | |
91 | ||
1d93a9cb | 92 | static bool |
f7108a20 | 93 | connmark_mt(const struct sk_buff *skb, const struct xt_match_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); | |
100 | if (ct == NULL) | |
101 | return false; | |
102 | ||
103 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; | |
104 | } | |
105 | ||
9b4fce7a | 106 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
96e32272 | 107 | { |
92f3b2b1 | 108 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
8bee4bad JE |
109 | pr_info("cannot load conntrack support for proto=%u\n", |
110 | par->family); | |
96e32272 JE |
111 | return false; |
112 | } | |
113 | return true; | |
114 | } | |
115 | ||
6be3d859 | 116 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
b9f78f9f | 117 | { |
92f3b2b1 | 118 | nf_ct_l3proto_module_put(par->family); |
b9f78f9f PNA |
119 | } |
120 | ||
b8f00ba2 JE |
121 | static struct xt_target connmark_tg_reg __read_mostly = { |
122 | .name = "CONNMARK", | |
123 | .revision = 1, | |
124 | .family = NFPROTO_UNSPEC, | |
125 | .checkentry = connmark_tg_check, | |
126 | .target = connmark_tg, | |
127 | .targetsize = sizeof(struct xt_connmark_tginfo1), | |
128 | .destroy = connmark_tg_destroy, | |
129 | .me = THIS_MODULE, | |
130 | }; | |
131 | ||
84899a2b JE |
132 | static struct xt_match connmark_mt_reg __read_mostly = { |
133 | .name = "connmark", | |
134 | .revision = 1, | |
135 | .family = NFPROTO_UNSPEC, | |
136 | .checkentry = connmark_mt_check, | |
137 | .match = connmark_mt, | |
138 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
139 | .destroy = connmark_mt_destroy, | |
140 | .me = THIS_MODULE, | |
1da177e4 LT |
141 | }; |
142 | ||
d3c5ee6d | 143 | static int __init connmark_mt_init(void) |
1da177e4 | 144 | { |
b8f00ba2 JE |
145 | int ret; |
146 | ||
147 | ret = xt_register_target(&connmark_tg_reg); | |
148 | if (ret < 0) | |
149 | return ret; | |
150 | ret = xt_register_match(&connmark_mt_reg); | |
151 | if (ret < 0) { | |
152 | xt_unregister_target(&connmark_tg_reg); | |
153 | return ret; | |
154 | } | |
155 | return 0; | |
1da177e4 LT |
156 | } |
157 | ||
d3c5ee6d | 158 | static void __exit connmark_mt_exit(void) |
1da177e4 | 159 | { |
84899a2b | 160 | xt_unregister_match(&connmark_mt_reg); |
b8f00ba2 | 161 | xt_unregister_target(&connmark_tg_reg); |
1da177e4 LT |
162 | } |
163 | ||
d3c5ee6d JE |
164 | module_init(connmark_mt_init); |
165 | module_exit(connmark_mt_exit); |