Release 4.18 net/netfilter/nf_nat_proto_common.c
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2008 Patrick McHardy <kaber@trash.net>
*
* 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/random.h>
#include <linux/netfilter.h>
#include <linux/export.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
bool nf_nat_l4proto_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)
{
__be16 port;
if (maniptype == NF_NAT_MANIP_SRC)
port = tuple->src.u.all;
else
port = tuple->dst.u.all;
return ntohs(port) >= ntohs(min->all) &&
ntohs(port) <= ntohs(max->all);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 81 | 98.78% | 3 | 75.00% |
| Jan Engelhardt | 1 | 1.22% | 1 | 25.00% |
| Total | 82 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct,
u16 *rover)
{
unsigned int range_size, min, max, i;
__be16 *portptr;
u_int16_t off;
if (maniptype == NF_NAT_MANIP_SRC)
portptr = &tuple->src.u.all;
else
portptr = &tuple->dst.u.all;
/* If no range specified... */
if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) {
/* If it's dst rewrite, can't change port */
if (maniptype == NF_NAT_MANIP_DST)
return;
if (ntohs(*portptr) < 1024) {
/* Loose convention: >> 512 is credential passing */
if (ntohs(*portptr) < 512) {
min = 1;
range_size = 511 - min + 1;
} else {
min = 600;
range_size = 1023 - min + 1;
}
} else {
min = 1024;
range_size = 65535 - 1024 + 1;
}
} else {
min = ntohs(range->min_proto.all);
max = ntohs(range->max_proto.all);
if (unlikely(max < min))
swap(max, min);
range_size = max - min + 1;
}
if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) {
off = l3proto->secure_port(tuple, maniptype == NF_NAT_MANIP_SRC
? tuple->dst.u.all
: tuple->src.u.all);
} else if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) {
off = prandom_u32();
} else if (range->flags & NF_NAT_RANGE_PROTO_OFFSET) {
off = (ntohs(*portptr) - ntohs(range->base_proto.all));
} else {
off = *rover;
}
for (i = 0; ; ++off) {
*portptr = htons(min + off % range_size);
if (++i != range_size && nf_nat_used_tuple(tuple, ct))
continue;
if (!(range->flags & (NF_NAT_RANGE_PROTO_RANDOM_ALL|
NF_NAT_RANGE_PROTO_OFFSET)))
*rover = off;
return;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 258 | 69.17% | 4 | 40.00% |
| Thierry Du Tre | 35 | 9.38% | 1 | 10.00% |
| Stephen Hemminger | 28 | 7.51% | 1 | 10.00% |
| Paolo Abeni | 23 | 6.17% | 1 | 10.00% |
| Daniel Borkmann | 21 | 5.63% | 1 | 10.00% |
| Changli Gao | 8 | 2.14% | 2 | 20.00% |
| Total | 373 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range2 *range)
{
if (tb[CTA_PROTONAT_PORT_MIN]) {
range->min_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
range->max_proto.all = range->min_proto.all;
range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
}
if (tb[CTA_PROTONAT_PORT_MAX]) {
range->max_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 88 | 98.88% | 4 | 80.00% |
| Thierry Du Tre | 1 | 1.12% | 1 | 20.00% |
| Total | 89 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(nf_nat_l4proto_nlattr_to_range);
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 471 | 79.56% | 6 | 40.00% |
| Thierry Du Tre | 36 | 6.08% | 1 | 6.67% |
| Stephen Hemminger | 28 | 4.73% | 1 | 6.67% |
| Paolo Abeni | 23 | 3.89% | 1 | 6.67% |
| Daniel Borkmann | 21 | 3.55% | 1 | 6.67% |
| Changli Gao | 8 | 1.35% | 2 | 13.33% |
| Paul Gortmaker | 3 | 0.51% | 1 | 6.67% |
| Jan Engelhardt | 1 | 0.17% | 1 | 6.67% |
| Duan Jiong | 1 | 0.17% | 1 | 6.67% |
| Total | 592 | 100.00% | 15 | 100.00% |
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