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-rw-r--r--net/ipv4/netfilter/Makefile2
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_common.c85
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_gre.c20
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_tcp.c65
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_udp.c64
5 files changed, 95 insertions, 141 deletions
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 0c7dc78a62e9..e73d0eb9994a 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -10,7 +10,7 @@ nf_conntrack_ipv4-objs += nf_conntrack_l3proto_ipv4_compat.o
10endif 10endif
11endif 11endif
12 12
13nf_nat-objs := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o 13nf_nat-objs := nf_nat_core.o nf_nat_helper.o nf_nat_proto_unknown.o nf_nat_proto_common.o nf_nat_proto_tcp.o nf_nat_proto_udp.o nf_nat_proto_icmp.o
14iptable_nat-objs := nf_nat_rule.o nf_nat_standalone.o 14iptable_nat-objs := nf_nat_rule.o nf_nat_standalone.o
15 15
16# connection tracking 16# connection tracking
diff --git a/net/ipv4/netfilter/nf_nat_proto_common.c b/net/ipv4/netfilter/nf_nat_proto_common.c
new file mode 100644
index 000000000000..a124213fb9da
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_proto_common.c
@@ -0,0 +1,85 @@
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>
4 *
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.
8 */
9
10#include <linux/types.h>
11#include <linux/random.h>
12#include <linux/ip.h>
13
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>
19
20int 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)
24{
25 __be16 port;
26
27 if (maniptype == IP_NAT_MANIP_SRC)
28 port = tuple->src.u.all;
29 else
30 port = tuple->dst.u.all;
31
32 return ntohs(port) >= ntohs(min->all) &&
33 ntohs(port) <= ntohs(max->all);
34}
35EXPORT_SYMBOL_GPL(nf_nat_proto_in_range);
36
37int 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,
41 u_int16_t *rover)
42{
43 unsigned int range_size, min, i;
44 __be16 *portptr;
45
46 if (maniptype == IP_NAT_MANIP_SRC)
47 portptr = &tuple->src.u.all;
48 else
49 portptr = &tuple->dst.u.all;
50
51 /* If no range specified... */
52 if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
53 /* If it's dst rewrite, can't change port */
54 if (maniptype == IP_NAT_MANIP_DST)
55 return 0;
56
57 if (ntohs(*portptr) < 1024) {
58 /* Loose convention: >> 512 is credential passing */
59 if (ntohs(*portptr) < 512) {
60 min = 1;
61 range_size = 511 - min + 1;
62 } else {
63 min = 600;
64 range_size = 1023 - min + 1;
65 }
66 } else {
67 min = 1024;
68 range_size = 65535 - 1024 + 1;
69 }
70 } else {
71 min = ntohs(range->min.all);
72 range_size = ntohs(range->max.all) - min + 1;
73 }
74
75 if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
76 *rover = net_random();
77
78 for (i = 0; i < range_size; i++, (*rover)++) {
79 *portptr = htons(min + *rover % range_size);
80 if (!nf_nat_used_tuple(tuple, ct))
81 return 1;
82 }
83 return 0;
84}
85EXPORT_SYMBOL_GPL(nf_nat_proto_unique_tuple);
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index a1e4da16da2e..87af63d9e692 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -36,24 +36,6 @@ MODULE_LICENSE("GPL");
36MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>"); 36MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
37MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE"); 37MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
38 38
39/* is key in given range between min and max */
40static int
41gre_in_range(const struct nf_conntrack_tuple *tuple,
42 enum nf_nat_manip_type maniptype,
43 const union nf_conntrack_man_proto *min,
44 const union nf_conntrack_man_proto *max)
45{
46 __be16 key;
47
48 if (maniptype == IP_NAT_MANIP_SRC)
49 key = tuple->src.u.gre.key;
50 else
51 key = tuple->dst.u.gre.key;
52
53 return ntohs(key) >= ntohs(min->gre.key) &&
54 ntohs(key) <= ntohs(max->gre.key);
55}
56
57/* generate unique tuple ... */ 39/* generate unique tuple ... */
58static int 40static int
59gre_unique_tuple(struct nf_conntrack_tuple *tuple, 41gre_unique_tuple(struct nf_conntrack_tuple *tuple,
@@ -140,7 +122,7 @@ static const struct nf_nat_protocol gre = {
140 .protonum = IPPROTO_GRE, 122 .protonum = IPPROTO_GRE,
141 .me = THIS_MODULE, 123 .me = THIS_MODULE,
142 .manip_pkt = gre_manip_pkt, 124 .manip_pkt = gre_manip_pkt,
143 .in_range = gre_in_range, 125 .in_range = nf_nat_proto_in_range,
144 .unique_tuple = gre_unique_tuple, 126 .unique_tuple = gre_unique_tuple,
145#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) 127#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
146 .range_to_nlattr = nf_nat_port_range_to_nlattr, 128 .range_to_nlattr = nf_nat_port_range_to_nlattr,
diff --git a/net/ipv4/netfilter/nf_nat_proto_tcp.c b/net/ipv4/netfilter/nf_nat_proto_tcp.c
index ffd5d1589eca..f8c498fc24fd 100644
--- a/net/ipv4/netfilter/nf_nat_proto_tcp.c
+++ b/net/ipv4/netfilter/nf_nat_proto_tcp.c
@@ -8,7 +8,6 @@
8 8
9#include <linux/types.h> 9#include <linux/types.h>
10#include <linux/init.h> 10#include <linux/init.h>
11#include <linux/random.h>
12#include <linux/ip.h> 11#include <linux/ip.h>
13#include <linux/tcp.h> 12#include <linux/tcp.h>
14 13
@@ -19,22 +18,7 @@
19#include <net/netfilter/nf_nat_protocol.h> 18#include <net/netfilter/nf_nat_protocol.h>
20#include <net/netfilter/nf_nat_core.h> 19#include <net/netfilter/nf_nat_core.h>
21 20
22static int 21static u_int16_t tcp_port_rover;
23tcp_in_range(const struct nf_conntrack_tuple *tuple,
24 enum nf_nat_manip_type maniptype,
25 const union nf_conntrack_man_proto *min,
26 const union nf_conntrack_man_proto *max)
27{
28 __be16 port;
29
30 if (maniptype == IP_NAT_MANIP_SRC)
31 port = tuple->src.u.tcp.port;
32 else
33 port = tuple->dst.u.tcp.port;
34
35 return ntohs(port) >= ntohs(min->tcp.port) &&
36 ntohs(port) <= ntohs(max->tcp.port);
37}
38 22
39static int 23static int
40tcp_unique_tuple(struct nf_conntrack_tuple *tuple, 24tcp_unique_tuple(struct nf_conntrack_tuple *tuple,
@@ -42,49 +26,8 @@ tcp_unique_tuple(struct nf_conntrack_tuple *tuple,
42 enum nf_nat_manip_type maniptype, 26 enum nf_nat_manip_type maniptype,
43 const struct nf_conn *ct) 27 const struct nf_conn *ct)
44{ 28{
45 static u_int16_t port; 29 return nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
46 __be16 *portptr; 30 &tcp_port_rover);
47 unsigned int range_size, min, i;
48
49 if (maniptype == IP_NAT_MANIP_SRC)
50 portptr = &tuple->src.u.tcp.port;
51 else
52 portptr = &tuple->dst.u.tcp.port;
53
54 /* If no range specified... */
55 if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
56 /* If it's dst rewrite, can't change port */
57 if (maniptype == IP_NAT_MANIP_DST)
58 return 0;
59
60 /* Map privileged onto privileged. */
61 if (ntohs(*portptr) < 1024) {
62 /* Loose convention: >> 512 is credential passing */
63 if (ntohs(*portptr)<512) {
64 min = 1;
65 range_size = 511 - min + 1;
66 } else {
67 min = 600;
68 range_size = 1023 - min + 1;
69 }
70 } else {
71 min = 1024;
72 range_size = 65535 - 1024 + 1;
73 }
74 } else {
75 min = ntohs(range->min.tcp.port);
76 range_size = ntohs(range->max.tcp.port) - min + 1;
77 }
78
79 if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
80 port = net_random();
81
82 for (i = 0; i < range_size; i++, port++) {
83 *portptr = htons(min + port % range_size);
84 if (!nf_nat_used_tuple(tuple, ct))
85 return 1;
86 }
87 return 0;
88} 31}
89 32
90static int 33static int
@@ -142,7 +85,7 @@ const struct nf_nat_protocol nf_nat_protocol_tcp = {
142 .protonum = IPPROTO_TCP, 85 .protonum = IPPROTO_TCP,
143 .me = THIS_MODULE, 86 .me = THIS_MODULE,
144 .manip_pkt = tcp_manip_pkt, 87 .manip_pkt = tcp_manip_pkt,
145 .in_range = tcp_in_range, 88 .in_range = nf_nat_proto_in_range,
146 .unique_tuple = tcp_unique_tuple, 89 .unique_tuple = tcp_unique_tuple,
147#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) 90#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
148 .range_to_nlattr = nf_nat_port_range_to_nlattr, 91 .range_to_nlattr = nf_nat_port_range_to_nlattr,
diff --git a/net/ipv4/netfilter/nf_nat_proto_udp.c b/net/ipv4/netfilter/nf_nat_proto_udp.c
index 4b8f49910ff2..a182f5ac3177 100644
--- a/net/ipv4/netfilter/nf_nat_proto_udp.c
+++ b/net/ipv4/netfilter/nf_nat_proto_udp.c
@@ -8,7 +8,6 @@
8 8
9#include <linux/types.h> 9#include <linux/types.h>
10#include <linux/init.h> 10#include <linux/init.h>
11#include <linux/random.h>
12#include <linux/ip.h> 11#include <linux/ip.h>
13#include <linux/udp.h> 12#include <linux/udp.h>
14 13
@@ -18,22 +17,7 @@
18#include <net/netfilter/nf_nat_rule.h> 17#include <net/netfilter/nf_nat_rule.h>
19#include <net/netfilter/nf_nat_protocol.h> 18#include <net/netfilter/nf_nat_protocol.h>
20 19
21static int 20static u_int16_t udp_port_rover;
22udp_in_range(const struct nf_conntrack_tuple *tuple,
23 enum nf_nat_manip_type maniptype,
24 const union nf_conntrack_man_proto *min,
25 const union nf_conntrack_man_proto *max)
26{
27 __be16 port;
28
29 if (maniptype == IP_NAT_MANIP_SRC)
30 port = tuple->src.u.udp.port;
31 else
32 port = tuple->dst.u.udp.port;
33
34 return ntohs(port) >= ntohs(min->udp.port) &&
35 ntohs(port) <= ntohs(max->udp.port);
36}
37 21
38static int 22static int
39udp_unique_tuple(struct nf_conntrack_tuple *tuple, 23udp_unique_tuple(struct nf_conntrack_tuple *tuple,
@@ -41,48 +25,8 @@ udp_unique_tuple(struct nf_conntrack_tuple *tuple,
41 enum nf_nat_manip_type maniptype, 25 enum nf_nat_manip_type maniptype,
42 const struct nf_conn *ct) 26 const struct nf_conn *ct)
43{ 27{
44 static u_int16_t port; 28 return nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
45 __be16 *portptr; 29 &udp_port_rover);
46 unsigned int range_size, min, i;
47
48 if (maniptype == IP_NAT_MANIP_SRC)
49 portptr = &tuple->src.u.udp.port;
50 else
51 portptr = &tuple->dst.u.udp.port;
52
53 /* If no range specified... */
54 if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
55 /* If it's dst rewrite, can't change port */
56 if (maniptype == IP_NAT_MANIP_DST)
57 return 0;
58
59 if (ntohs(*portptr) < 1024) {
60 /* Loose convention: >> 512 is credential passing */
61 if (ntohs(*portptr)<512) {
62 min = 1;
63 range_size = 511 - min + 1;
64 } else {
65 min = 600;
66 range_size = 1023 - min + 1;
67 }
68 } else {
69 min = 1024;
70 range_size = 65535 - 1024 + 1;
71 }
72 } else {
73 min = ntohs(range->min.udp.port);
74 range_size = ntohs(range->max.udp.port) - min + 1;
75 }
76
77 if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
78 port = net_random();
79
80 for (i = 0; i < range_size; i++, port++) {
81 *portptr = htons(min + port % range_size);
82 if (!nf_nat_used_tuple(tuple, ct))
83 return 1;
84 }
85 return 0;
86} 30}
87 31
88static int 32static int
@@ -132,7 +76,7 @@ const struct nf_nat_protocol nf_nat_protocol_udp = {
132 .protonum = IPPROTO_UDP, 76 .protonum = IPPROTO_UDP,
133 .me = THIS_MODULE, 77 .me = THIS_MODULE,
134 .manip_pkt = udp_manip_pkt, 78 .manip_pkt = udp_manip_pkt,
135 .in_range = udp_in_range, 79 .in_range = nf_nat_proto_in_range,
136 .unique_tuple = udp_unique_tuple, 80 .unique_tuple = udp_unique_tuple,
137#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) 81#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
138 .range_to_nlattr = nf_nat_port_range_to_nlattr, 82 .range_to_nlattr = nf_nat_port_range_to_nlattr,
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-25 10:26:14 -0500