1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
3 * (C) 2008 Patrick McHardy <kaber@trash.net>
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.
10 #include <linux/types.h>
11 #include <linux/random.h>
14 #include <linux/netfilter.h>
15 #include <net/netfilter/nf_nat.h>
16 #include <net/netfilter/nf_nat_core.h>
17 #include <net/netfilter/nf_nat_rule.h>
18 #include <net/netfilter/nf_nat_protocol.h>
20 bool nf_nat_proto_in_range(const struct nf_conntrack_tuple
*tuple
,
21 enum nf_nat_manip_type maniptype
,
22 const union nf_conntrack_man_proto
*min
,
23 const union nf_conntrack_man_proto
*max
)
27 if (maniptype
== IP_NAT_MANIP_SRC
)
28 port
= tuple
->src
.u
.all
;
30 port
= tuple
->dst
.u
.all
;
32 return ntohs(port
) >= ntohs(min
->all
) &&
33 ntohs(port
) <= ntohs(max
->all
);
35 EXPORT_SYMBOL_GPL(nf_nat_proto_in_range
);
37 bool nf_nat_proto_unique_tuple(struct nf_conntrack_tuple
*tuple
,
38 const struct nf_nat_range
*range
,
39 enum nf_nat_manip_type maniptype
,
40 const struct nf_conn
*ct
,
43 unsigned int range_size
, min
, i
;
47 if (maniptype
== IP_NAT_MANIP_SRC
)
48 portptr
= &tuple
->src
.u
.all
;
50 portptr
= &tuple
->dst
.u
.all
;
52 /* If no range specified... */
53 if (!(range
->flags
& IP_NAT_RANGE_PROTO_SPECIFIED
)) {
54 /* If it's dst rewrite, can't change port */
55 if (maniptype
== IP_NAT_MANIP_DST
)
58 if (ntohs(*portptr
) < 1024) {
59 /* Loose convention: >> 512 is credential passing */
60 if (ntohs(*portptr
) < 512) {
62 range_size
= 511 - min
+ 1;
65 range_size
= 1023 - min
+ 1;
69 range_size
= 65535 - 1024 + 1;
72 min
= ntohs(range
->min
.all
);
73 range_size
= ntohs(range
->max
.all
) - min
+ 1;
77 if (range
->flags
& IP_NAT_RANGE_PROTO_RANDOM
)
80 for (i
= 0; i
< range_size
; i
++, off
++) {
81 *portptr
= htons(min
+ off
% range_size
);
82 if (nf_nat_used_tuple(tuple
, ct
))
84 if (!(range
->flags
& IP_NAT_RANGE_PROTO_RANDOM
))
90 EXPORT_SYMBOL_GPL(nf_nat_proto_unique_tuple
);
92 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
93 int nf_nat_proto_range_to_nlattr(struct sk_buff
*skb
,
94 const struct nf_nat_range
*range
)
96 NLA_PUT_BE16(skb
, CTA_PROTONAT_PORT_MIN
, range
->min
.all
);
97 NLA_PUT_BE16(skb
, CTA_PROTONAT_PORT_MAX
, range
->max
.all
);
103 EXPORT_SYMBOL_GPL(nf_nat_proto_nlattr_to_range
);
105 int nf_nat_proto_nlattr_to_range(struct nlattr
*tb
[],
106 struct nf_nat_range
*range
)
108 if (tb
[CTA_PROTONAT_PORT_MIN
]) {
109 range
->min
.all
= nla_get_be16(tb
[CTA_PROTONAT_PORT_MIN
]);
110 range
->max
.all
= range
->min
.tcp
.port
;
111 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
113 if (tb
[CTA_PROTONAT_PORT_MAX
]) {
114 range
->max
.all
= nla_get_be16(tb
[CTA_PROTONAT_PORT_MAX
]);
115 range
->flags
|= IP_NAT_RANGE_PROTO_SPECIFIED
;
119 EXPORT_SYMBOL_GPL(nf_nat_proto_range_to_nlattr
);