2 * iptables module to match inet_addr_type() of an ip.
4 * Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
5 * (C) 2007 Laszlo Attila Toth <panther@balabit.hu>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/skbuff.h>
15 #include <linux/netdevice.h>
17 #include <net/route.h>
19 #include <linux/netfilter_ipv4/ipt_addrtype.h>
20 #include <linux/netfilter/x_tables.h>
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
24 MODULE_DESCRIPTION("Xtables: address type match for IPv4");
26 static inline bool match_type(const struct net_device
*dev
, __be32 addr
,
29 return !!(mask
& (1 << inet_dev_addr_type(&init_net
, dev
, addr
)));
33 addrtype_mt_v0(const struct sk_buff
*skb
, const struct net_device
*in
,
34 const struct net_device
*out
, const struct xt_match
*match
,
35 const void *matchinfo
, int offset
, unsigned int protoff
,
38 const struct ipt_addrtype_info
*info
= matchinfo
;
39 const struct iphdr
*iph
= ip_hdr(skb
);
43 ret
&= match_type(NULL
, iph
->saddr
, info
->source
) ^
46 ret
&= match_type(NULL
, iph
->daddr
, info
->dest
) ^
53 addrtype_mt_v1(const struct sk_buff
*skb
, const struct net_device
*in
,
54 const struct net_device
*out
, const struct xt_match
*match
,
55 const void *matchinfo
, int offset
, unsigned int protoff
,
58 const struct ipt_addrtype_info_v1
*info
= matchinfo
;
59 const struct iphdr
*iph
= ip_hdr(skb
);
60 const struct net_device
*dev
= NULL
;
63 if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
)
65 else if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
)
69 ret
&= match_type(dev
, iph
->saddr
, info
->source
) ^
70 (info
->flags
& IPT_ADDRTYPE_INVERT_SOURCE
);
71 if (ret
&& info
->dest
)
72 ret
&= match_type(dev
, iph
->daddr
, info
->dest
) ^
73 !!(info
->flags
& IPT_ADDRTYPE_INVERT_DEST
);
78 addrtype_mt_checkentry_v1(const char *tablename
, const void *ip_void
,
79 const struct xt_match
*match
, void *matchinfo
,
80 unsigned int hook_mask
)
82 struct ipt_addrtype_info_v1
*info
= matchinfo
;
84 if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
&&
85 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
) {
86 printk(KERN_ERR
"ipt_addrtype: both incoming and outgoing "
87 "interface limitation cannot be selected\n");
91 if (hook_mask
& (1 << NF_INET_PRE_ROUTING
| 1 << NF_INET_LOCAL_IN
) &&
92 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
) {
93 printk(KERN_ERR
"ipt_addrtype: output interface limitation "
94 "not valid in PRE_ROUTING and INPUT\n");
98 if (hook_mask
& (1 << NF_INET_POST_ROUTING
| 1 << NF_INET_LOCAL_OUT
) &&
99 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
) {
100 printk(KERN_ERR
"ipt_addrtype: input interface limitation "
101 "not valid in POST_ROUTING and OUTPUT\n");
108 static struct xt_match addrtype_mt_reg
[] __read_mostly
= {
111 .family
= NFPROTO_IPV4
,
112 .match
= addrtype_mt_v0
,
113 .matchsize
= sizeof(struct ipt_addrtype_info
),
118 .family
= NFPROTO_IPV4
,
120 .match
= addrtype_mt_v1
,
121 .checkentry
= addrtype_mt_checkentry_v1
,
122 .matchsize
= sizeof(struct ipt_addrtype_info_v1
),
127 static int __init
addrtype_mt_init(void)
129 return xt_register_matches(addrtype_mt_reg
,
130 ARRAY_SIZE(addrtype_mt_reg
));
133 static void __exit
addrtype_mt_exit(void)
135 xt_unregister_matches(addrtype_mt_reg
, ARRAY_SIZE(addrtype_mt_reg
));
138 module_init(addrtype_mt_init
);
139 module_exit(addrtype_mt_exit
);