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);
71 static bool addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
73 struct ipt_addrtype_info_v1 *info = par->matchinfo;
75 if (info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN &&
76 info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
77 printk(KERN_ERR "ipt_addrtype: both incoming and outgoing "
78 "interface limitation cannot be selected\n");
82 if (par->hook_mask & ((1 << NF_INET_PRE_ROUTING) |
83 (1 << NF_INET_LOCAL_IN)) &&
84 info->flags & IPT_ADDRTYPE_LIMIT_IFACE_OUT) {
85 printk(KERN_ERR "ipt_addrtype: output interface limitation "
86 "not valid in PRE_ROUTING and INPUT\n");
90 if (par->hook_mask & ((1 << NF_INET_POST_ROUTING) |
91 (1 << NF_INET_LOCAL_OUT)) &&
92 info->flags & IPT_ADDRTYPE_LIMIT_IFACE_IN) {
93 printk(KERN_ERR "ipt_addrtype: input interface limitation "
94 "not valid in POST_ROUTING and OUTPUT\n");
101 static struct xt_match addrtype_mt_reg[] __read_mostly = {
104 .family = NFPROTO_IPV4,
105 .match = addrtype_mt_v0,
106 .matchsize = sizeof(struct ipt_addrtype_info),
111 .family = NFPROTO_IPV4,
113 .match = addrtype_mt_v1,
114 .checkentry = addrtype_mt_checkentry_v1,
115 .matchsize = sizeof(struct ipt_addrtype_info_v1),
120 static int __init addrtype_mt_init(void)
122 return xt_register_matches(addrtype_mt_reg,
123 ARRAY_SIZE(addrtype_mt_reg));
126 static void __exit addrtype_mt_exit(void)
128 xt_unregister_matches(addrtype_mt_reg, ARRAY_SIZE(addrtype_mt_reg));
131 module_init(addrtype_mt_init);
132 module_exit(addrtype_mt_exit);