Merge branch 'topic/misc' into topic/pcsp-fix
[linux-2.6] / net / netfilter / xt_iprange.c
1 /*
2  *      xt_iprange - Netfilter module to match IP address ranges
3  *
4  *      (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5  *      (C) CC Computer Consultants GmbH, 2008
6  *
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.
10  */
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
13 #include <linux/ip.h>
14 #include <linux/ipv6.h>
15 #include <linux/netfilter/x_tables.h>
16 #include <linux/netfilter/xt_iprange.h>
17 #include <linux/netfilter_ipv4/ipt_iprange.h>
18
19 static bool
20 iprange_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
21 {
22         const struct ipt_iprange_info *info = par->matchinfo;
23         const struct iphdr *iph = ip_hdr(skb);
24
25         if (info->flags & IPRANGE_SRC) {
26                 if ((ntohl(iph->saddr) < ntohl(info->src.min_ip)
27                           || ntohl(iph->saddr) > ntohl(info->src.max_ip))
28                          ^ !!(info->flags & IPRANGE_SRC_INV)) {
29                         pr_debug("src IP %u.%u.%u.%u NOT in range %s"
30                                  "%u.%u.%u.%u-%u.%u.%u.%u\n",
31                                  NIPQUAD(iph->saddr),
32                                  info->flags & IPRANGE_SRC_INV ? "(INV) " : "",
33                                  NIPQUAD(info->src.min_ip),
34                                  NIPQUAD(info->src.max_ip));
35                         return false;
36                 }
37         }
38         if (info->flags & IPRANGE_DST) {
39                 if ((ntohl(iph->daddr) < ntohl(info->dst.min_ip)
40                           || ntohl(iph->daddr) > ntohl(info->dst.max_ip))
41                          ^ !!(info->flags & IPRANGE_DST_INV)) {
42                         pr_debug("dst IP %u.%u.%u.%u NOT in range %s"
43                                  "%u.%u.%u.%u-%u.%u.%u.%u\n",
44                                  NIPQUAD(iph->daddr),
45                                  info->flags & IPRANGE_DST_INV ? "(INV) " : "",
46                                  NIPQUAD(info->dst.min_ip),
47                                  NIPQUAD(info->dst.max_ip));
48                         return false;
49                 }
50         }
51         return true;
52 }
53
54 static bool
55 iprange_mt4(const struct sk_buff *skb, const struct xt_match_param *par)
56 {
57         const struct xt_iprange_mtinfo *info = par->matchinfo;
58         const struct iphdr *iph = ip_hdr(skb);
59         bool m;
60
61         if (info->flags & IPRANGE_SRC) {
62                 m  = ntohl(iph->saddr) < ntohl(info->src_min.ip);
63                 m |= ntohl(iph->saddr) > ntohl(info->src_max.ip);
64                 m ^= !!(info->flags & IPRANGE_SRC_INV);
65                 if (m) {
66                         pr_debug("src IP " NIPQUAD_FMT " NOT in range %s"
67                                  NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
68                                  NIPQUAD(iph->saddr),
69                                  (info->flags & IPRANGE_SRC_INV) ? "(INV) " : "",
70                                  NIPQUAD(info->src_max.ip),
71                                  NIPQUAD(info->src_max.ip));
72                         return false;
73                 }
74         }
75         if (info->flags & IPRANGE_DST) {
76                 m  = ntohl(iph->daddr) < ntohl(info->dst_min.ip);
77                 m |= ntohl(iph->daddr) > ntohl(info->dst_max.ip);
78                 m ^= !!(info->flags & IPRANGE_DST_INV);
79                 if (m) {
80                         pr_debug("dst IP " NIPQUAD_FMT " NOT in range %s"
81                                  NIPQUAD_FMT "-" NIPQUAD_FMT "\n",
82                                  NIPQUAD(iph->daddr),
83                                  (info->flags & IPRANGE_DST_INV) ? "(INV) " : "",
84                                  NIPQUAD(info->dst_min.ip),
85                                  NIPQUAD(info->dst_max.ip));
86                         return false;
87                 }
88         }
89         return true;
90 }
91
92 static inline int
93 iprange_ipv6_sub(const struct in6_addr *a, const struct in6_addr *b)
94 {
95         unsigned int i;
96         int r;
97
98         for (i = 0; i < 4; ++i) {
99                 r = ntohl(a->s6_addr32[i]) - ntohl(b->s6_addr32[i]);
100                 if (r != 0)
101                         return r;
102         }
103
104         return 0;
105 }
106
107 static bool
108 iprange_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
109 {
110         const struct xt_iprange_mtinfo *info = par->matchinfo;
111         const struct ipv6hdr *iph = ipv6_hdr(skb);
112         bool m;
113
114         if (info->flags & IPRANGE_SRC) {
115                 m  = iprange_ipv6_sub(&iph->saddr, &info->src_min.in6) < 0;
116                 m |= iprange_ipv6_sub(&iph->saddr, &info->src_max.in6) > 0;
117                 m ^= !!(info->flags & IPRANGE_SRC_INV);
118                 if (m)
119                         return false;
120         }
121         if (info->flags & IPRANGE_DST) {
122                 m  = iprange_ipv6_sub(&iph->daddr, &info->dst_min.in6) < 0;
123                 m |= iprange_ipv6_sub(&iph->daddr, &info->dst_max.in6) > 0;
124                 m ^= !!(info->flags & IPRANGE_DST_INV);
125                 if (m)
126                         return false;
127         }
128         return true;
129 }
130
131 static struct xt_match iprange_mt_reg[] __read_mostly = {
132         {
133                 .name      = "iprange",
134                 .revision  = 0,
135                 .family    = NFPROTO_IPV4,
136                 .match     = iprange_mt_v0,
137                 .matchsize = sizeof(struct ipt_iprange_info),
138                 .me        = THIS_MODULE,
139         },
140         {
141                 .name      = "iprange",
142                 .revision  = 1,
143                 .family    = NFPROTO_IPV4,
144                 .match     = iprange_mt4,
145                 .matchsize = sizeof(struct xt_iprange_mtinfo),
146                 .me        = THIS_MODULE,
147         },
148         {
149                 .name      = "iprange",
150                 .revision  = 1,
151                 .family    = NFPROTO_IPV6,
152                 .match     = iprange_mt6,
153                 .matchsize = sizeof(struct xt_iprange_mtinfo),
154                 .me        = THIS_MODULE,
155         },
156 };
157
158 static int __init iprange_mt_init(void)
159 {
160         return xt_register_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
161 }
162
163 static void __exit iprange_mt_exit(void)
164 {
165         xt_unregister_matches(iprange_mt_reg, ARRAY_SIZE(iprange_mt_reg));
166 }
167
168 module_init(iprange_mt_init);
169 module_exit(iprange_mt_exit);
170 MODULE_LICENSE("GPL");
171 MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>, Jan Engelhardt <jengelh@computergmbh.de>");
172 MODULE_DESCRIPTION("Xtables: arbitrary IPv4 range matching");
173 MODULE_ALIAS("ipt_iprange");
174 MODULE_ALIAS("ip6t_iprange");