1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/types.h>
10 #include <linux/init.h>
11 #include <linux/netfilter.h>
13 #include <linux/icmp.h>
16 #include <linux/netfilter_ipv4/ip_nat.h>
17 #include <linux/netfilter_ipv4/ip_nat_core.h>
18 #include <linux/netfilter_ipv4/ip_nat_rule.h>
19 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
22 icmp_in_range(const struct ip_conntrack_tuple
*tuple
,
23 enum ip_nat_manip_type maniptype
,
24 const union ip_conntrack_manip_proto
*min
,
25 const union ip_conntrack_manip_proto
*max
)
27 return (tuple
->src
.u
.icmp
.id
>= min
->icmp
.id
28 && tuple
->src
.u
.icmp
.id
<= max
->icmp
.id
);
32 icmp_unique_tuple(struct ip_conntrack_tuple
*tuple
,
33 const struct ip_nat_range
*range
,
34 enum ip_nat_manip_type maniptype
,
35 const struct ip_conntrack
*conntrack
)
38 unsigned int range_size
39 = (unsigned int)range
->max
.icmp
.id
- range
->min
.icmp
.id
+ 1;
42 /* If no range specified... */
43 if (!(range
->flags
& IP_NAT_RANGE_PROTO_SPECIFIED
))
46 for (i
= 0; i
< range_size
; i
++, id
++) {
47 tuple
->src
.u
.icmp
.id
= range
->min
.icmp
.id
+ (id
% range_size
);
48 if (!ip_nat_used_tuple(tuple
, conntrack
))
55 icmp_manip_pkt(struct sk_buff
**pskb
,
57 const struct ip_conntrack_manip
*manip
,
58 enum ip_nat_manip_type maniptype
)
62 if (!skb_ip_make_writable(pskb
, hdroff
+ sizeof(*hdr
)))
65 hdr
= (void *)(*pskb
)->data
+ hdroff
;
67 hdr
->checksum
= ip_nat_cheat_check(hdr
->un
.echo
.id
^ 0xFFFF,
70 hdr
->un
.echo
.id
= manip
->u
.icmp
.id
;
75 icmp_print(char *buffer
,
76 const struct ip_conntrack_tuple
*match
,
77 const struct ip_conntrack_tuple
*mask
)
81 if (mask
->src
.u
.icmp
.id
)
82 len
+= sprintf(buffer
+ len
, "id=%u ",
83 ntohs(match
->src
.u
.icmp
.id
));
85 if (mask
->dst
.u
.icmp
.type
)
86 len
+= sprintf(buffer
+ len
, "type=%u ",
87 ntohs(match
->dst
.u
.icmp
.type
));
89 if (mask
->dst
.u
.icmp
.code
)
90 len
+= sprintf(buffer
+ len
, "code=%u ",
91 ntohs(match
->dst
.u
.icmp
.code
));
97 icmp_print_range(char *buffer
, const struct ip_nat_range
*range
)
99 if (range
->min
.icmp
.id
!= 0 || range
->max
.icmp
.id
!= 0xFFFF)
100 return sprintf(buffer
, "id %u-%u ",
101 ntohs(range
->min
.icmp
.id
),
102 ntohs(range
->max
.icmp
.id
));
106 struct ip_nat_protocol ip_nat_protocol_icmp
107 = { "ICMP", IPPROTO_ICMP
,