Release 4.11 net/ipv4/netfilter/nf_nat_proto_icmp.c
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l4proto.h>
static bool
icmp_in_range(const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype,
const union nf_conntrack_man_proto *min,
const union nf_conntrack_man_proto *max)
{
return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 72 | 98.63% | 1 | 50.00% |
Jan Engelhardt | 1 | 1.37% | 1 | 50.00% |
Total | 73 | 100.00% | 2 | 100.00% |
static void
icmp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
static u_int16_t id;
unsigned int range_size;
unsigned int i;
range_size = ntohs(range->max_proto.icmp.id) -
ntohs(range->min_proto.icmp.id) + 1;
/* If no range specified... */
if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
range_size = 0xFFFF;
for (i = 0; ; ++id) {
tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
(id % range_size));
if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
return;
}
return;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 127 | 86.99% | 1 | 20.00% |
Patrick McHardy | 11 | 7.53% | 2 | 40.00% |
Changli Gao | 8 | 5.48% | 2 | 40.00% |
Total | 146 | 100.00% | 5 | 100.00% |
static bool
icmp_manip_pkt(struct sk_buff *skb,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
struct icmphdr *hdr;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
hdr = (struct icmphdr *)(skb->data + hdroff);
inet_proto_csum_replace2(&hdr->checksum, skb,
hdr->un.echo.id, tuple->src.u.icmp.id, false);
hdr->un.echo.id = tuple->src.u.icmp.id;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 106 | 84.80% | 1 | 16.67% |
Patrick McHardy | 11 | 8.80% | 2 | 33.33% |
Herbert Xu | 4 | 3.20% | 1 | 16.67% |
Jan Engelhardt | 3 | 2.40% | 1 | 16.67% |
Tom Herbert | 1 | 0.80% | 1 | 16.67% |
Total | 125 | 100.00% | 6 | 100.00% |
const struct nf_nat_l4proto nf_nat_l4proto_icmp = {
.l4proto = IPPROTO_ICMP,
.manip_pkt = icmp_manip_pkt,
.in_range = icmp_in_range,
.unique_tuple = icmp_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Jozsef Kadlecsik | 362 | 87.65% | 1 | 7.14% |
Patrick McHardy | 30 | 7.26% | 6 | 42.86% |
Changli Gao | 8 | 1.94% | 2 | 14.29% |
Jan Engelhardt | 4 | 0.97% | 1 | 7.14% |
Herbert Xu | 4 | 0.97% | 1 | 7.14% |
Paul Gortmaker | 3 | 0.73% | 1 | 7.14% |
Tom Herbert | 1 | 0.24% | 1 | 7.14% |
Duan Jiong | 1 | 0.24% | 1 | 7.14% |
Total | 413 | 100.00% | 14 | 100.00% |
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