[NETFILTER]: Fix nf_conntrack_ftp.c build.
[linux-2.6.git] / net / netfilter / xt_MARK.c
1 /* This is a module which is used for setting the NFMARK field of an skb. */
2
3 /* (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  */
9
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 #include <linux/ip.h>
13 #include <net/checksum.h>
14
15 #include <linux/netfilter/x_tables.h>
16 #include <linux/netfilter/xt_MARK.h>
17
18 MODULE_LICENSE("GPL");
19 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
20 MODULE_DESCRIPTION("ip[6]tables MARK modification module");
21 MODULE_ALIAS("ipt_MARK");
22 MODULE_ALIAS("ip6t_MARK");
23
24 static unsigned int
25 target_v0(struct sk_buff **pskb,
26           const struct net_device *in,
27           const struct net_device *out,
28           unsigned int hooknum,
29           const struct xt_target *target,
30           const void *targinfo)
31 {
32         const struct xt_mark_target_info *markinfo = targinfo;
33
34         if((*pskb)->nfmark != markinfo->mark)
35                 (*pskb)->nfmark = markinfo->mark;
36
37         return XT_CONTINUE;
38 }
39
40 static unsigned int
41 target_v1(struct sk_buff **pskb,
42           const struct net_device *in,
43           const struct net_device *out,
44           unsigned int hooknum,
45           const struct xt_target *target,
46           const void *targinfo)
47 {
48         const struct xt_mark_target_info_v1 *markinfo = targinfo;
49         int mark = 0;
50
51         switch (markinfo->mode) {
52         case XT_MARK_SET:
53                 mark = markinfo->mark;
54                 break;
55                 
56         case XT_MARK_AND:
57                 mark = (*pskb)->nfmark & markinfo->mark;
58                 break;
59                 
60         case XT_MARK_OR:
61                 mark = (*pskb)->nfmark | markinfo->mark;
62                 break;
63         }
64
65         if((*pskb)->nfmark != mark)
66                 (*pskb)->nfmark = mark;
67
68         return XT_CONTINUE;
69 }
70
71
72 static int
73 checkentry_v0(const char *tablename,
74               const void *entry,
75               const struct xt_target *target,
76               void *targinfo,
77               unsigned int hook_mask)
78 {
79         struct xt_mark_target_info *markinfo = targinfo;
80
81         if (markinfo->mark > 0xffffffff) {
82                 printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
83                 return 0;
84         }
85         return 1;
86 }
87
88 static int
89 checkentry_v1(const char *tablename,
90               const void *entry,
91               const struct xt_target *target,
92               void *targinfo,
93               unsigned int hook_mask)
94 {
95         struct xt_mark_target_info_v1 *markinfo = targinfo;
96
97         if (markinfo->mode != XT_MARK_SET
98             && markinfo->mode != XT_MARK_AND
99             && markinfo->mode != XT_MARK_OR) {
100                 printk(KERN_WARNING "MARK: unknown mode %u\n",
101                        markinfo->mode);
102                 return 0;
103         }
104         if (markinfo->mark > 0xffffffff) {
105                 printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n");
106                 return 0;
107         }
108         return 1;
109 }
110
111 static struct xt_target xt_mark_target[] = {
112         {
113                 .name           = "MARK",
114                 .family         = AF_INET,
115                 .revision       = 0,
116                 .checkentry     = checkentry_v0,
117                 .target         = target_v0,
118                 .targetsize     = sizeof(struct xt_mark_target_info),
119                 .table          = "mangle",
120                 .me             = THIS_MODULE,
121         },
122         {
123                 .name           = "MARK",
124                 .family         = AF_INET,
125                 .revision       = 1,
126                 .checkentry     = checkentry_v1,
127                 .target         = target_v1,
128                 .targetsize     = sizeof(struct xt_mark_target_info_v1),
129                 .table          = "mangle",
130                 .me             = THIS_MODULE,
131         },
132         {
133                 .name           = "MARK",
134                 .family         = AF_INET6,
135                 .revision       = 0,
136                 .checkentry     = checkentry_v0,
137                 .target         = target_v0,
138                 .targetsize     = sizeof(struct xt_mark_target_info),
139                 .table          = "mangle",
140                 .me             = THIS_MODULE,
141         },
142 };
143
144 static int __init xt_mark_init(void)
145 {
146         return xt_register_targets(xt_mark_target, ARRAY_SIZE(xt_mark_target));
147 }
148
149 static void __exit xt_mark_fini(void)
150 {
151         xt_unregister_targets(xt_mark_target, ARRAY_SIZE(xt_mark_target));
152 }
153
154 module_init(xt_mark_init);
155 module_exit(xt_mark_fini);