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 xt_match_param
*par
)
35 const struct ipt_addrtype_info
*info
= par
->matchinfo
;
36 const struct iphdr
*iph
= ip_hdr(skb
);
40 ret
&= match_type(NULL
, iph
->saddr
, info
->source
) ^
43 ret
&= match_type(NULL
, iph
->daddr
, info
->dest
) ^
50 addrtype_mt_v1(const struct sk_buff
*skb
, const struct xt_match_param
*par
)
52 const struct ipt_addrtype_info_v1
*info
= par
->matchinfo
;
53 const struct iphdr
*iph
= ip_hdr(skb
);
54 const struct net_device
*dev
= NULL
;
57 if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
)
59 else if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
)
63 ret
&= match_type(dev
, iph
->saddr
, info
->source
) ^
64 (info
->flags
& IPT_ADDRTYPE_INVERT_SOURCE
);
65 if (ret
&& info
->dest
)
66 ret
&= match_type(dev
, iph
->daddr
, info
->dest
) ^
67 !!(info
->flags
& IPT_ADDRTYPE_INVERT_DEST
);
72 addrtype_mt_checkentry_v1(const char *tablename
, const void *ip_void
,
73 const struct xt_match
*match
, void *matchinfo
,
74 unsigned int hook_mask
)
76 struct ipt_addrtype_info_v1
*info
= matchinfo
;
78 if (info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
&&
79 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
) {
80 printk(KERN_ERR
"ipt_addrtype: both incoming and outgoing "
81 "interface limitation cannot be selected\n");
85 if (hook_mask
& (1 << NF_INET_PRE_ROUTING
| 1 << NF_INET_LOCAL_IN
) &&
86 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_OUT
) {
87 printk(KERN_ERR
"ipt_addrtype: output interface limitation "
88 "not valid in PRE_ROUTING and INPUT\n");
92 if (hook_mask
& (1 << NF_INET_POST_ROUTING
| 1 << NF_INET_LOCAL_OUT
) &&
93 info
->flags
& IPT_ADDRTYPE_LIMIT_IFACE_IN
) {
94 printk(KERN_ERR
"ipt_addrtype: input interface limitation "
95 "not valid in POST_ROUTING and OUTPUT\n");
102 static struct xt_match addrtype_mt_reg
[] __read_mostly
= {
105 .family
= NFPROTO_IPV4
,
106 .match
= addrtype_mt_v0
,
107 .matchsize
= sizeof(struct ipt_addrtype_info
),
112 .family
= NFPROTO_IPV4
,
114 .match
= addrtype_mt_v1
,
115 .checkentry
= addrtype_mt_checkentry_v1
,
116 .matchsize
= sizeof(struct ipt_addrtype_info_v1
),
121 static int __init
addrtype_mt_init(void)
123 return xt_register_matches(addrtype_mt_reg
,
124 ARRAY_SIZE(addrtype_mt_reg
));
127 static void __exit
addrtype_mt_exit(void)
129 xt_unregister_matches(addrtype_mt_reg
, ARRAY_SIZE(addrtype_mt_reg
));
132 module_init(addrtype_mt_init
);
133 module_exit(addrtype_mt_exit
);