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1 | /* |
2 | * xt_CONNMARK - Netfilter module to modify the connection mark values |
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@computergmbh.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 | #include <linux/module.h> |
24 | #include <linux/skbuff.h> |
25 | #include <linux/ip.h> |
26 | #include <net/checksum.h> |
27 | |
28 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
29 | MODULE_DESCRIPTION("Xtables: connection mark modification"); |
30 | MODULE_LICENSE("GPL"); |
31 | MODULE_ALIAS("ipt_CONNMARK"); |
32 | MODULE_ALIAS("ip6t_CONNMARK"); |
33 | |
34 | #include <linux/netfilter/x_tables.h> |
35 | #include <linux/netfilter/xt_CONNMARK.h> |
36 | #include <net/netfilter/nf_conntrack_ecache.h> |
37 | |
38 | static unsigned int |
39 | connmark_tg(struct sk_buff *skb, const struct xt_target_param *par) |
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); |
47 | if (ct == NULL) |
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 | |
76 | static bool connmark_tg_check(const struct xt_tgchk_param *par) |
77 | { |
78 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
79 | printk(KERN_WARNING "cannot load conntrack support for " |
80 | "proto=%u\n", par->family); |
81 | return false; |
82 | } |
83 | return true; |
84 | } |
85 | |
86 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
87 | { |
88 | nf_ct_l3proto_module_put(par->family); |
89 | } |
90 | |
91 | static struct xt_target connmark_tg_reg __read_mostly = { |
92 | .name = "CONNMARK", |
93 | .revision = 1, |
94 | .family = NFPROTO_UNSPEC, |
95 | .checkentry = connmark_tg_check, |
96 | .target = connmark_tg, |
97 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
98 | .destroy = connmark_tg_destroy, |
99 | .me = THIS_MODULE, |
100 | }; |
101 | |
102 | static int __init connmark_tg_init(void) |
103 | { |
104 | return xt_register_target(&connmark_tg_reg); |
105 | } |
106 | |
107 | static void __exit connmark_tg_exit(void) |
108 | { |
109 | xt_unregister_target(&connmark_tg_reg); |
110 | } |
111 | |
112 | module_init(connmark_tg_init); |
113 | module_exit(connmark_tg_exit); |
114 |
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