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,