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netfilter: add protocol independent NAT core 

Convert the IPv4 NAT implementation to a protocol independent core and
address family specific modules.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2012-08-26 19:14:06 +02:00 committed by Pablo Neira Ayuso
parent 051966c0c6
commit c7232c9979
49 changed files with 1506 additions and 1151 deletions
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14
include/linux/netfilter.h
View File

@ -342,7 +342,7 @@ extern int nf_register_afinfo(const struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
#include <net/flow.h>
extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
static inline void
nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
@ -350,13 +350,11 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
#ifdef CONFIG_NF_NAT_NEEDED
void (*decodefn)(struct sk_buff *, struct flowi *);
if (family == AF_INET) {
rcu_read_lock();
decodefn = rcu_dereference(ip_nat_decode_session);
if (decodefn)
decodefn(skb, fl);
rcu_read_unlock();
}
rcu_read_lock();
decodefn = rcu_dereference(nf_nat_decode_session_hook);
if (decodefn)
decodefn(skb, fl);
rcu_read_unlock();
#endif
}

8
include/linux/netfilter/nf_nat.h
View File

@ -22,4 +22,12 @@ struct nf_nat_ipv4_multi_range_compat {
struct nf_nat_ipv4_range range[1];
};
struct nf_nat_range {
unsigned int flags;
union nf_inet_addr min_addr;
union nf_inet_addr max_addr;
union nf_conntrack_man_proto min_proto;
union nf_conntrack_man_proto max_proto;
};
#endif /* _NETFILTER_NF_NAT_H */

6
include/linux/netfilter/nfnetlink_conntrack.h
View File

@ -142,8 +142,10 @@ enum ctattr_tstamp {
enum ctattr_nat {
CTA_NAT_UNSPEC,
CTA_NAT_MINIP,
CTA_NAT_MAXIP,
CTA_NAT_V4_MINIP,
#define CTA_NAT_MINIP CTA_NAT_V4_MINIP
CTA_NAT_V4_MAXIP,
#define CTA_NAT_MAXIP CTA_NAT_V4_MAXIP
CTA_NAT_PROTO,
__CTA_NAT_MAX
};

1
include/linux/netfilter_ipv4.h
View File

@ -79,7 +79,6 @@ enum nf_ip_hook_priorities {
#ifdef __KERNEL__
extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
extern int ip_xfrm_me_harder(struct sk_buff *skb);
extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol);
#endif /*__KERNEL__*/

2
include/net/netfilter/nf_conntrack_expect.h
View File

@ -43,7 +43,7 @@ struct nf_conntrack_expect {
unsigned int class;
#ifdef CONFIG_NF_NAT_NEEDED
__be32 saved_ip;
union nf_inet_addr saved_addr;
/* This is the original per-proto part, used to map the
* expected connection the way the recipient expects. */
union nf_conntrack_man_proto saved_proto;

2
include/net/netfilter/nf_nat.h
View File

@ -50,7 +50,7 @@ struct nf_conn_nat {
/* Set up the info structure to map into this range. */
extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
const struct nf_nat_ipv4_range *range,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype);
/* Is this tuple already taken? (not by us)*/

5
include/net/netfilter/nf_nat_core.h
View File

@ -12,10 +12,7 @@ extern unsigned int nf_nat_packet(struct nf_conn *ct,
unsigned int hooknum,
struct sk_buff *skb);
extern int nf_nat_icmp_reply_translation(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum,
struct sk_buff *skb);
extern int nf_xfrm_me_harder(struct sk_buff *skb, unsigned int family);
static inline int nf_nat_initialized(struct nf_conn *ct,
enum nf_nat_manip_type manip)

47
include/net/netfilter/nf_nat_l3proto.h Normal file
View File

@ -0,0 +1,47 @@
#ifndef _NF_NAT_L3PROTO_H
#define _NF_NAT_L3PROTO_H
struct nf_nat_l4proto;
struct nf_nat_l3proto {
u8 l3proto;
bool (*in_range)(const struct nf_conntrack_tuple *t,
const struct nf_nat_range *range);
u32 (*secure_port)(const struct nf_conntrack_tuple *t, __be16);
bool (*manip_pkt)(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *target,
enum nf_nat_manip_type maniptype);
void (*csum_update)(struct sk_buff *skb, unsigned int iphdroff,
__sum16 *check,
const struct nf_conntrack_tuple *t,
enum nf_nat_manip_type maniptype);
void (*csum_recalc)(struct sk_buff *skb, u8 proto,
void *data, __sum16 *check,
int datalen, int oldlen);
void (*decode_session)(struct sk_buff *skb,
const struct nf_conn *ct,
enum ip_conntrack_dir dir,
unsigned long statusbit,
struct flowi *fl);
int (*nlattr_to_range)(struct nlattr *tb[],
struct nf_nat_range *range);
};
extern int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
extern void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *);
extern const struct nf_nat_l3proto *__nf_nat_l3proto_find(u8 l3proto);
extern int nf_nat_icmp_reply_translation(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum);
#endif /* _NF_NAT_L3PROTO_H */

71
include/net/netfilter/nf_nat_l4proto.h Normal file
View File

@ -0,0 +1,71 @@
/* Header for use in defining a given protocol. */
#ifndef _NF_NAT_L4PROTO_H
#define _NF_NAT_L4PROTO_H
#include <net/netfilter/nf_nat.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
struct nf_nat_range;
struct nf_nat_l3proto;
struct nf_nat_l4proto {
/* Protocol number. */
u8 l4proto;
/* Translate a packet to the target according to manip type.
* Return true if succeeded.
*/
bool (*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);
/* Is the manipable part of the tuple between min and max incl? */
bool (*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);
/* Alter the per-proto part of the tuple (depending on
* maniptype), to give a unique tuple in the given range if
* possible. Per-protocol part of tuple is initialized to the
* incoming packet.
*/
void (*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);
int (*nlattr_to_range)(struct nlattr *tb[],
struct nf_nat_range *range);
};
/* Protocol registration. */
extern int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto);
extern void nf_nat_l4proto_unregister(u8 l3proto, const struct nf_nat_l4proto *l4proto);
extern const struct nf_nat_l4proto *__nf_nat_l4proto_find(u8 l3proto, u8 l4proto);
/* Built-in protocols. */
extern const struct nf_nat_l4proto nf_nat_l4proto_tcp;
extern const struct nf_nat_l4proto nf_nat_l4proto_udp;
extern const struct nf_nat_l4proto nf_nat_l4proto_icmp;
extern const struct nf_nat_l4proto nf_nat_l4proto_unknown;
extern 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);
extern void nf_nat_l4proto_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,
u16 *rover);
extern int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range *range);
#endif /*_NF_NAT_L4PROTO_H*/

67
include/net/netfilter/nf_nat_protocol.h
View File

@ -1,67 +0,0 @@
/* Header for use in defining a given protocol. */
#ifndef _NF_NAT_PROTOCOL_H
#define _NF_NAT_PROTOCOL_H
#include <net/netfilter/nf_nat.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
struct nf_nat_ipv4_range;
struct nf_nat_protocol {
/* Protocol number. */
unsigned int protonum;
/* Translate a packet to the target according to manip type.
Return true if succeeded. */
bool (*manip_pkt)(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype);
/* Is the manipable part of the tuple between min and max incl? */
bool (*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);
/* Alter the per-proto part of the tuple (depending on
maniptype), to give a unique tuple in the given range if
possible. Per-protocol part of tuple is initialized to the
incoming packet. */
void (*unique_tuple)(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct);
int (*nlattr_to_range)(struct nlattr *tb[],
struct nf_nat_ipv4_range *range);
};
/* Protocol registration. */
extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto);
extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto);
/* Built-in protocols. */
extern const struct nf_nat_protocol nf_nat_protocol_tcp;
extern const struct nf_nat_protocol nf_nat_protocol_udp;
extern const struct nf_nat_protocol nf_nat_protocol_icmp;
extern const struct nf_nat_protocol nf_nat_unknown_protocol;
extern int init_protocols(void) __init;
extern void cleanup_protocols(void);
extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
extern bool nf_nat_proto_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);
extern void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct,
u_int16_t *rover);
extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_ipv4_range *range);
#endif /*_NF_NAT_PROTO_H*/

15
include/net/netfilter/nf_nat_rule.h
View File

@ -1,15 +0,0 @@
#ifndef _NF_NAT_RULE_H
#define _NF_NAT_RULE_H
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <linux/netfilter_ipv4/ip_tables.h>
extern int nf_nat_rule_init(void) __init;
extern void nf_nat_rule_cleanup(void);
extern int nf_nat_rule_find(struct sk_buff *skb,
unsigned int hooknum,
const struct net_device *in,
const struct net_device *out,
struct nf_conn *ct);
#endif /* _NF_NAT_RULE_H */

4
include/net/netns/conntrack.h
View File

@ -83,6 +83,10 @@ struct netns_ct {
int sysctl_auto_assign_helper;
bool auto_assign_helper_warned;
struct nf_ip_net nf_ct_proto;
#ifdef CONFIG_NF_NAT_NEEDED
struct hlist_head *nat_bysource;
unsigned int nat_htable_size;
#endif
#ifdef CONFIG_SYSCTL
struct ctl_table_header *sysctl_header;
struct ctl_table_header *acct_sysctl_header;

2
include/net/netns/ipv4.h
View File

@ -51,8 +51,6 @@ struct netns_ipv4 {
struct xt_table *iptable_security;
#endif
struct xt_table *nat_table;
struct hlist_head *nat_bysource;
unsigned int nat_htable_size;
#endif
int sysctl_icmp_echo_ignore_all;

37
net/ipv4/netfilter.c
View File

@ -72,43 +72,6 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
}
EXPORT_SYMBOL(ip_route_me_harder);
#ifdef CONFIG_XFRM
int ip_xfrm_me_harder(struct sk_buff *skb)
{
struct flowi fl;
unsigned int hh_len;
struct dst_entry *dst;
if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
return 0;
if (xfrm_decode_session(skb, &fl, AF_INET) < 0)
return -1;
dst = skb_dst(skb);
if (dst->xfrm)
dst = ((struct xfrm_dst *)dst)->route;
dst_hold(dst);
dst = xfrm_lookup(dev_net(dst->dev), dst, &fl, skb->sk, 0);
if (IS_ERR(dst))
return -1;
skb_dst_drop(skb);
skb_dst_set(skb, dst);
/* Change in oif may mean change in hh_len. */
hh_len = skb_dst(skb)->dev->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
return -1;
return 0;
}
EXPORT_SYMBOL(ip_xfrm_me_harder);
#endif
void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);
EXPORT_SYMBOL(ip_nat_decode_session);
/*
* Extra routing may needed on local out, as the QUEUE target never
* returns control to the table.

64
net/ipv4/netfilter/Kconfig
View File

@ -143,25 +143,22 @@ config IP_NF_TARGET_ULOG
To compile it as a module, choose M here. If unsure, say N.
# NAT + specific targets: nf_conntrack
config NF_NAT
tristate "Full NAT"
config NF_NAT_IPV4
tristate "IPv4 NAT"
depends on NF_CONNTRACK_IPV4
default m if NETFILTER_ADVANCED=n
select NF_NAT
help
The Full NAT option allows masquerading, port forwarding and other
The IPv4 NAT option allows masquerading, port forwarding and other
forms of full Network Address Port Translation. It is controlled by
the `nat' table in iptables: see the man page for iptables(8).
To compile it as a module, choose M here. If unsure, say N.
config NF_NAT_NEEDED
bool
depends on NF_NAT
default y
if NF_NAT_IPV4
config IP_NF_TARGET_MASQUERADE
tristate "MASQUERADE target support"
depends on NF_NAT
default m if NETFILTER_ADVANCED=n
help
Masquerading is a special case of NAT: all outgoing connections are
@ -174,7 +171,6 @@ config IP_NF_TARGET_MASQUERADE
config IP_NF_TARGET_NETMAP
tristate "NETMAP target support"
depends on NF_NAT
depends on NETFILTER_ADVANCED
help
NETMAP is an implementation of static 1:1 NAT mapping of network
@ -185,7 +181,6 @@ config IP_NF_TARGET_NETMAP
config IP_NF_TARGET_REDIRECT
tristate "REDIRECT target support"
depends on NF_NAT
depends on NETFILTER_ADVANCED
help
REDIRECT is a special case of NAT: all incoming connections are
@ -195,9 +190,11 @@ config IP_NF_TARGET_REDIRECT
To compile it as a module, choose M here. If unsure, say N.
endif
config NF_NAT_SNMP_BASIC
tristate "Basic SNMP-ALG support"
depends on NF_CONNTRACK_SNMP && NF_NAT
depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
depends on NETFILTER_ADVANCED
default NF_NAT && NF_CONNTRACK_SNMP
---help---
@ -219,61 +216,46 @@ config NF_NAT_SNMP_BASIC
# <expr> '&&' <expr> (6)
#
# (6) Returns the result of min(/expr/, /expr/).
config NF_NAT_PROTO_DCCP
tristate
depends on NF_NAT && NF_CT_PROTO_DCCP
default NF_NAT && NF_CT_PROTO_DCCP
config NF_NAT_PROTO_GRE
tristate
depends on NF_NAT && NF_CT_PROTO_GRE
config NF_NAT_PROTO_UDPLITE
tristate
depends on NF_NAT && NF_CT_PROTO_UDPLITE
default NF_NAT && NF_CT_PROTO_UDPLITE
config NF_NAT_PROTO_SCTP
tristate
default NF_NAT && NF_CT_PROTO_SCTP
depends on NF_NAT && NF_CT_PROTO_SCTP
select LIBCRC32C
depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
config NF_NAT_FTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_FTP
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_FTP
config NF_NAT_IRC
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_IRC
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_IRC
config NF_NAT_TFTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_TFTP
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_TFTP
config NF_NAT_AMANDA
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_AMANDA
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_AMANDA
config NF_NAT_PPTP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_PPTP
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
select NF_NAT_PROTO_GRE
config NF_NAT_H323
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_H323
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_H323
config NF_NAT_SIP
tristate
depends on NF_CONNTRACK && NF_NAT
default NF_NAT && NF_CONNTRACK_SIP
depends on NF_CONNTRACK && NF_NAT_IPV4
default NF_NAT_IPV4 && NF_CONNTRACK_SIP
# mangle + specific targets
config IP_NF_MANGLE

11
net/ipv4/netfilter/Makefile
View File

@ -10,13 +10,11 @@ nf_conntrack_ipv4-objs += nf_conntrack_l3proto_ipv4_compat.o
endif
endif
nf_nat-y := 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
iptable_nat-y := nf_nat_rule.o nf_nat_standalone.o
# connection tracking
obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o
obj-$(CONFIG_NF_NAT) += nf_nat.o
nf_nat_ipv4-y := nf_nat_l3proto_ipv4.o nf_nat_proto_icmp.o
obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o
# defrag
obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
@ -32,10 +30,7 @@ obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o
obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
@ -43,7 +38,7 @@ obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
# the three instances of ip_tables
obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
obj-$(CONFIG_NF_NAT) += iptable_nat.o
obj-$(CONFIG_NF_NAT_IPV4) += iptable_nat.o
obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o

15
net/ipv4/netfilter/ipt_MASQUERADE.c
View File

@ -19,9 +19,9 @@
#include <net/ip.h>
#include <net/checksum.h>
#include <net/route.h>
#include <net/netfilter/nf_nat_rule.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@ -49,7 +49,7 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
struct nf_conn *ct;
struct nf_conn_nat *nat;
enum ip_conntrack_info ctinfo;
struct nf_nat_ipv4_range newrange;
struct nf_nat_range newrange;
const struct nf_nat_ipv4_multi_range_compat *mr;
const struct rtable *rt;
__be32 newsrc, nh;
@ -80,10 +80,13 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
nat->masq_index = par->out->ifindex;
/* Transfer from original range. */
newrange = ((struct nf_nat_ipv4_range)
{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
newsrc, newsrc,
mr->range[0].min, mr->range[0].max });
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.ip = newsrc;
newrange.max_addr.ip = newsrc;
newrange.min_proto = mr->range[0].min;
newrange.max_proto = mr->range[0].max;
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_SRC);

15
net/ipv4/netfilter/ipt_NETMAP.c
View File

@ -16,7 +16,7 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Svenning Soerensen <svenning@post5.tele.dk>");
@ -44,7 +44,7 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par)
enum ip_conntrack_info ctinfo;
__be32 new_ip, netmask;
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
struct nf_nat_ipv4_range newrange;
struct nf_nat_range newrange;
NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_POST_ROUTING ||
@ -61,10 +61,13 @@ netmap_tg(struct sk_buff *skb, const struct xt_action_param *par)
new_ip = ip_hdr(skb)->saddr & ~netmask;
new_ip |= mr->range[0].min_ip & netmask;
newrange = ((struct nf_nat_ipv4_range)
{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
new_ip, new_ip,
mr->range[0].min, mr->range[0].max });
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.ip = new_ip;
newrange.max_addr.ip = new_ip;
newrange.min_proto = mr->range[0].min;
newrange.max_proto = mr->range[0].max;
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange, HOOK2MANIP(par->hooknum));

15
net/ipv4/netfilter/ipt_REDIRECT.c
View File

@ -19,7 +19,7 @@
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@ -48,7 +48,7 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
enum ip_conntrack_info ctinfo;
__be32 newdst;
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
struct nf_nat_ipv4_range newrange;
struct nf_nat_range newrange;
NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT);
@ -76,10 +76,13 @@ redirect_tg(struct sk_buff *skb, const struct xt_action_param *par)
}
/* Transfer from original range. */
newrange = ((struct nf_nat_ipv4_range)
{ mr->range[0].flags | NF_NAT_RANGE_MAP_IPS,
newdst, newdst,
mr->range[0].min, mr->range[0].max });
memset(&newrange.min_addr, 0, sizeof(newrange.min_addr));
memset(&newrange.max_addr, 0, sizeof(newrange.max_addr));
newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS;
newrange.min_addr.ip = newdst;
newrange.max_addr.ip = newdst;
newrange.min_proto = mr->range[0].min;
newrange.max_proto = mr->range[0].max;
/* Hand modified range to generic setup. */
return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST);

276
net/ipv4/netfilter/nf_nat_standalone.c → net/ipv4/netfilter/iptable_nat.c
View File

@ -1,84 +1,71 @@
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2011 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/icmp.h>
#include <linux/gfp.h>
#include <linux/ip.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <linux/spinlock.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_helper.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/ip.h>
#include <net/ip.h>
#ifdef CONFIG_XFRM
static void nat_decode_session(struct sk_buff *skb, struct flowi *fl)
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l3proto.h>
static const struct xt_table nf_nat_ipv4_table = {
.name = "nat",
.valid_hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_LOCAL_IN),
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
};
static unsigned int alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
{
struct flowi4 *fl4 = &fl->u.ip4;
const struct nf_conn *ct;
const struct nf_conntrack_tuple *t;
enum ip_conntrack_info ctinfo;
enum ip_conntrack_dir dir;
unsigned long statusbit;
/* Force range to this IP; let proto decide mapping for
* per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
*/
struct nf_nat_range range;
ct = nf_ct_get(skb, &ctinfo);
if (ct == NULL)
return;
dir = CTINFO2DIR(ctinfo);
t = &ct->tuplehash[dir].tuple;
range.flags = 0;
pr_debug("Allocating NULL binding for %p (%pI4)\n", ct,
HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip :
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
if (dir == IP_CT_DIR_ORIGINAL)
statusbit = IPS_DST_NAT;
else
statusbit = IPS_SRC_NAT;
if (ct->status & statusbit) {
fl4->daddr = t->dst.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl4->fl4_dport = t->dst.u.tcp.port;
}
statusbit ^= IPS_NAT_MASK;
if (ct->status & statusbit) {
fl4->saddr = t->src.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl4->fl4_sport = t->src.u.tcp.port;
}
return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
}
static unsigned int nf_nat_rule_find(struct sk_buff *skb, unsigned int hooknum,
const struct net_device *in,
const struct net_device *out,
struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
unsigned int ret;
ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table);
if (ret == NF_ACCEPT) {
if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
ret = alloc_null_binding(ct, hooknum);
}
return ret;
}
#endif
static unsigned int
nf_nat_fn(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
nf_nat_ipv4_fn(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
@ -87,14 +74,16 @@ nf_nat_fn(unsigned int hooknum,
enum nf_nat_manip_type maniptype = HOOK2MANIP(hooknum);
/* We never see fragments: conntrack defrags on pre-routing
and local-out, and nf_nat_out protects post-routing. */
* and local-out, and nf_nat_out protects post-routing.
*/
NF_CT_ASSERT(!ip_is_fragment(ip_hdr(skb)));
ct = nf_ct_get(skb, &ctinfo);
/* Can't track? It's not due to stress, or conntrack would
have dropped it. Hence it's the user's responsibilty to
packet filter it out, or implement conntrack/NAT for that
protocol. 8) --RR */
* have dropped it. Hence it's the user's responsibilty to
* packet filter it out, or implement conntrack/NAT for that
* protocol. 8) --RR
*/
if (!ct)
return NF_ACCEPT;
@ -118,17 +107,17 @@ nf_nat_fn(unsigned int hooknum,
case IP_CT_RELATED:
case IP_CT_RELATED_REPLY:
if (ip_hdr(skb)->protocol == IPPROTO_ICMP) {
if (!nf_nat_icmp_reply_translation(ct, ctinfo,
hooknum, skb))
if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
hooknum))
return NF_DROP;
else
return NF_ACCEPT;
}
/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
case IP_CT_NEW:
/* Seen it before? This can happen for loopback, retrans,
or local packets.. */
* or local packets.
*/
if (!nf_nat_initialized(ct, maniptype)) {
unsigned int ret;
@ -151,16 +140,16 @@ nf_nat_fn(unsigned int hooknum,
}
static unsigned int
nf_nat_in(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
nf_nat_ipv4_in(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
unsigned int ret;
__be32 daddr = ip_hdr(skb)->daddr;
ret = nf_nat_fn(hooknum, skb, in, out, okfn);
ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN &&
daddr != ip_hdr(skb)->daddr)
skb_dst_drop(skb);
@ -169,11 +158,11 @@ nf_nat_in(unsigned int hooknum,
}
static unsigned int
nf_nat_out(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
nf_nat_ipv4_out(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
#ifdef CONFIG_XFRM
const struct nf_conn *ct;
@ -186,29 +175,30 @@ nf_nat_out(unsigned int hooknum,
ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
ret = nf_nat_fn(hooknum, skb, in, out, okfn);
ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn);
#ifdef CONFIG_XFRM
if (ret != NF_DROP && ret != NF_STOLEN &&
!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
if ((ct->tuplehash[dir].tuple.src.u3.ip !=
ct->tuplehash[!dir].tuple.dst.u3.ip) ||
(ct->tuplehash[dir].tuple.src.u.all !=
ct->tuplehash[!dir].tuple.dst.u.all)
)
return ip_xfrm_me_harder(skb) == 0 ? ret : NF_DROP;
ct->tuplehash[!dir].tuple.dst.u.all))
if (nf_xfrm_me_harder(skb, AF_INET) < 0)
ret = NF_DROP;
}
#endif
return ret;
}
static unsigned int
nf_nat_local_fn(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
nf_nat_ipv4_local_fn(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
@ -219,7 +209,7 @@ nf_nat_local_fn(unsigned int hooknum,
ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
ret = nf_nat_fn(hooknum, skb, in, out, okfn);
ret = nf_nat_ipv4_fn(hooknum, skb, in, out, okfn);
if (ret != NF_DROP && ret != NF_STOLEN &&
(ct = nf_ct_get(skb, &ctinfo)) != NULL) {
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
@ -230,21 +220,20 @@ nf_nat_local_fn(unsigned int hooknum,
ret = NF_DROP;
}
#ifdef CONFIG_XFRM
else if (ct->tuplehash[dir].tuple.dst.u.all !=
else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
ct->tuplehash[dir].tuple.dst.u.all !=
ct->tuplehash[!dir].tuple.src.u.all)
if (ip_xfrm_me_harder(skb))
if (nf_xfrm_me_harder(skb, AF_INET) < 0)
ret = NF_DROP;
#endif
}
return ret;
}
/* We must be after connection tracking and before packet filtering. */
static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
static struct nf_hook_ops nf_nat_ipv4_ops[] __read_mostly = {
/* Before packet filtering, change destination */
{
.hook = nf_nat_in,
.hook = nf_nat_ipv4_in,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_PRE_ROUTING,
@ -252,7 +241,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
},
/* After packet filtering, change source */
{
.hook = nf_nat_out,
.hook = nf_nat_ipv4_out,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
@ -260,7 +249,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
},
/* Before packet filtering, change destination */
{
.hook = nf_nat_local_fn,
.hook = nf_nat_ipv4_local_fn,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_OUT,
@ -268,7 +257,7 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
},
/* After packet filtering, change source */
{
.hook = nf_nat_fn,
.hook = nf_nat_ipv4_fn,
.owner = THIS_MODULE,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
@ -276,51 +265,56 @@ static struct nf_hook_ops nf_nat_ops[] __read_mostly = {
},
};
static int __init nf_nat_standalone_init(void)
static int __net_init iptable_nat_net_init(struct net *net)
{
int ret = 0;
struct ipt_replace *repl;
need_ipv4_conntrack();
#ifdef CONFIG_XFRM
BUG_ON(ip_nat_decode_session != NULL);
RCU_INIT_POINTER(ip_nat_decode_session, nat_decode_session);
#endif
ret = nf_nat_rule_init();
if (ret < 0) {
pr_err("nf_nat_init: can't setup rules.\n");
goto cleanup_decode_session;
}
ret = nf_register_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
if (ret < 0) {
pr_err("nf_nat_init: can't register hooks.\n");
goto cleanup_rule_init;
}
return ret;
cleanup_rule_init:
nf_nat_rule_cleanup();
cleanup_decode_session:
#ifdef CONFIG_XFRM
RCU_INIT_POINTER(ip_nat_decode_session, NULL);
synchronize_net();
#endif
return ret;
repl = ipt_alloc_initial_table(&nf_nat_ipv4_table);
if (repl == NULL)
return -ENOMEM;
net->ipv4.nat_table = ipt_register_table(net, &nf_nat_ipv4_table, repl);
kfree(repl);
if (IS_ERR(net->ipv4.nat_table))
return PTR_ERR(net->ipv4.nat_table);
return 0;
}
static void __exit nf_nat_standalone_fini(void)
static void __net_exit iptable_nat_net_exit(struct net *net)
{
nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops));
nf_nat_rule_cleanup();
#ifdef CONFIG_XFRM
RCU_INIT_POINTER(ip_nat_decode_session, NULL);
synchronize_net();
#endif
/* Conntrack caches are unregistered in nf_conntrack_cleanup */
ipt_unregister_table(net, net->ipv4.nat_table);
}
module_init(nf_nat_standalone_init);
module_exit(nf_nat_standalone_fini);
static struct pernet_operations iptable_nat_net_ops = {
.init = iptable_nat_net_init,
.exit = iptable_nat_net_exit,
};
static int __init iptable_nat_init(void)
{
int err;
err = register_pernet_subsys(&iptable_nat_net_ops);
if (err < 0)
goto err1;
err = nf_register_hooks(nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops));
if (err < 0)
goto err2;
return 0;
err2:
unregister_pernet_subsys(&iptable_nat_net_ops);
err1:
return err;
}
static void __exit iptable_nat_exit(void)
{
nf_unregister_hooks(nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops));
unregister_pernet_subsys(&iptable_nat_net_ops);
}
module_init(iptable_nat_init);
module_exit(iptable_nat_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_nat");

6
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View File

@ -29,12 +29,6 @@
#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
#include <net/netfilter/nf_log.h>
int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int protoff);
EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook);
static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
struct nf_conntrack_tuple *tuple)
{

1
net/ipv4/netfilter/nf_nat_amanda.c
View File

@ -16,7 +16,6 @@
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <linux/netfilter/nf_conntrack_amanda.h>
MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");

1
net/ipv4/netfilter/nf_nat_ftp.c
View File

@ -15,7 +15,6 @@
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_ftp.h>

23
net/ipv4/netfilter/nf_nat_h323.c
View File

@ -15,7 +15,6 @@
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_h323.h>
@ -392,7 +391,7 @@ static int nat_h245(struct sk_buff *skb, struct nf_conn *ct,
static void ip_nat_q931_expect(struct nf_conn *new,
struct nf_conntrack_expect *this)
{
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */
nf_nat_follow_master(new, this);
@ -404,14 +403,15 @@ static void ip_nat_q931_expect(struct nf_conn *new,
/* Change src to where master sends to */
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
range.min_addr = range.max_addr =
new->tuplehash[!this->dir].tuple.src.u3;
nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
/* For DST manip, map port here to where it's expected. */
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
range.min = range.max = this->saved_proto;
range.min_ip = range.max_ip =
new->master->tuplehash[!this->dir].tuple.src.u3.ip;
range.min_proto = range.max_proto = this->saved_proto;
range.min_addr = range.max_addr =
new->master->tuplehash[!this->dir].tuple.src.u3;
nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
}
@ -490,20 +490,21 @@ static int nat_q931(struct sk_buff *skb, struct nf_conn *ct,
static void ip_nat_callforwarding_expect(struct nf_conn *new,
struct nf_conntrack_expect *this)
{
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
/* This must be a fresh one. */
BUG_ON(new->status & IPS_NAT_DONE_MASK);
/* Change src to where master sends to */
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
range.min_addr = range.max_addr =
new->tuplehash[!this->dir].tuple.src.u3;
nf_nat_setup_info(new, &range, NF_NAT_MANIP_SRC);
/* For DST manip, map port here to where it's expected. */
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
range.min = range.max = this->saved_proto;
range.min_ip = range.max_ip = this->saved_ip;
range.min_proto = range.max_proto = this->saved_proto;
range.min_addr = range.max_addr = this->saved_addr;
nf_nat_setup_info(new, &range, NF_NAT_MANIP_DST);
}
@ -519,7 +520,7 @@ static int nat_callforwarding(struct sk_buff *skb, struct nf_conn *ct,
u_int16_t nated_port;
/* Set expectations for NAT */
exp->saved_ip = exp->tuple.dst.u3.ip;
exp->saved_addr = exp->tuple.dst.u3;
exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
exp->expectfn = ip_nat_callforwarding_expect;

1
net/ipv4/netfilter/nf_nat_irc.c
View File

@ -17,7 +17,6 @@
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_irc.h>

281
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c Normal file
View File

@ -0,0 +1,281 @@
/*
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2011 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/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <net/secure_seq.h>
#include <net/checksum.h>
#include <net/route.h>
#include <net/ip.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
static const struct nf_nat_l3proto nf_nat_l3proto_ipv4;
#ifdef CONFIG_XFRM
static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
const struct nf_conn *ct,
enum ip_conntrack_dir dir,
unsigned long statusbit,
struct flowi *fl)
{
const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple;
struct flowi4 *fl4 = &fl->u.ip4;
if (ct->status & statusbit) {
fl4->daddr = t->dst.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl4->fl4_dport = t->dst.u.all;
}
statusbit ^= IPS_NAT_MASK;
if (ct->status & statusbit) {
fl4->saddr = t->src.u3.ip;
if (t->dst.protonum == IPPROTO_TCP ||
t->dst.protonum == IPPROTO_UDP ||
t->dst.protonum == IPPROTO_UDPLITE ||
t->dst.protonum == IPPROTO_DCCP ||
t->dst.protonum == IPPROTO_SCTP)
fl4->fl4_sport = t->src.u.all;
}
}
#endif /* CONFIG_XFRM */
static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
const struct nf_nat_range *range)
{
return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
}
static u32 nf_nat_ipv4_secure_port(const struct nf_conntrack_tuple *t,
__be16 dport)
{
return secure_ipv4_port_ephemeral(t->src.u3.ip, t->dst.u3.ip, dport);
}
static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *target,
enum nf_nat_manip_type maniptype)
{
struct iphdr *iph;
unsigned int hdroff;
if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
return false;
iph = (void *)skb->data + iphdroff;
hdroff = iphdroff + iph->ihl * 4;
if (!l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv4, iphdroff, hdroff,
target, maniptype))
return false;
iph = (void *)skb->data + iphdroff;
if (maniptype == NF_NAT_MANIP_SRC) {
csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
iph->saddr = target->src.u3.ip;
} else {
csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
iph->daddr = target->dst.u3.ip;
}
return true;
}
static void nf_nat_ipv4_csum_update(struct sk_buff *skb,
unsigned int iphdroff, __sum16 *check,
const struct nf_conntrack_tuple *t,
enum nf_nat_manip_type maniptype)
{
struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
__be32 oldip, newip;
if (maniptype == NF_NAT_MANIP_SRC) {
oldip = iph->saddr;
newip = t->src.u3.ip;
} else {
oldip = iph->daddr;
newip = t->dst.u3.ip;
}
inet_proto_csum_replace4(check, skb, oldip, newip, 1);
}
static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
u8 proto, void *data, __sum16 *check,
int datalen, int oldlen)
{
const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt = skb_rtable(skb);
if (skb->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
(!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_headroom(skb) +
skb_network_offset(skb) +
ip_hdrlen(skb);
skb->csum_offset = (void *)check - data;
*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
datalen, proto, 0);
} else {
*check = 0;
*check = csum_tcpudp_magic(iph->saddr, iph->daddr,
datalen, proto,
csum_partial(data, datalen,
0));
if (proto == IPPROTO_UDP && !*check)
*check = CSUM_MANGLED_0;
}
} else
inet_proto_csum_replace2(check, skb,
htons(oldlen), htons(datalen), 1);
}
static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range *range)
{
if (tb[CTA_NAT_V4_MINIP]) {
range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]);
range->flags |= NF_NAT_RANGE_MAP_IPS;
}
if (tb[CTA_NAT_V4_MAXIP])
range->max_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MAXIP]);
else
range->max_addr.ip = range->min_addr.ip;
return 0;
}
static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = {
.l3proto = NFPROTO_IPV4,
.in_range = nf_nat_ipv4_in_range,
.secure_port = nf_nat_ipv4_secure_port,
.manip_pkt = nf_nat_ipv4_manip_pkt,
.csum_update = nf_nat_ipv4_csum_update,
.csum_recalc = nf_nat_ipv4_csum_recalc,
.nlattr_to_range = nf_nat_ipv4_nlattr_to_range,
#ifdef CONFIG_XFRM
.decode_session = nf_nat_ipv4_decode_session,
#endif
};
int nf_nat_icmp_reply_translation(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum)
{
struct {
struct icmphdr icmp;
struct iphdr ip;
} *inside;
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
unsigned int hdrlen = ip_hdrlen(skb);
const struct nf_nat_l4proto *l4proto;
struct nf_conntrack_tuple target;
unsigned long statusbit;
NF_CT_ASSERT(ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY);
if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
return 0;
if (nf_ip_checksum(skb, hooknum, hdrlen, 0))
return 0;
inside = (void *)skb->data + hdrlen;
if (inside->icmp.type == ICMP_REDIRECT) {
if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
return 0;
if (ct->status & IPS_NAT_MASK)
return 0;
}
if (manip == NF_NAT_MANIP_SRC)
statusbit = IPS_SRC_NAT;
else
statusbit = IPS_DST_NAT;
/* Invert if this is reply direction */
if (dir == IP_CT_DIR_REPLY)
statusbit ^= IPS_NAT_MASK;
if (!(ct->status & statusbit))
return 1;
l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, inside->ip.protocol);
if (!nf_nat_ipv4_manip_pkt(skb, hdrlen + sizeof(inside->icmp),
l4proto, &ct->tuplehash[!dir].tuple, !manip))
return 0;
if (skb->ip_summed != CHECKSUM_PARTIAL) {
/* Reloading "inside" here since manip_pkt may reallocate */
inside = (void *)skb->data + hdrlen;
inside->icmp.checksum = 0;
inside->icmp.checksum =
csum_fold(skb_checksum(skb, hdrlen,
skb->len - hdrlen, 0));
}
/* Change outer to look like the reply to an incoming packet */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
l4proto = __nf_nat_l4proto_find(NFPROTO_IPV4, 0);
if (!nf_nat_ipv4_manip_pkt(skb, 0, l4proto, &target, manip))
return 0;
return 1;
}
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
static int __init nf_nat_l3proto_ipv4_init(void)
{
int err;
err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
if (err < 0)
goto err1;
err = nf_nat_l3proto_register(&nf_nat_l3proto_ipv4);
if (err < 0)
goto err2;
return err;
err2:
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
err1:
return err;
}
static void __exit nf_nat_l3proto_ipv4_exit(void)
{
nf_nat_l3proto_unregister(&nf_nat_l3proto_ipv4);
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_icmp);
}
MODULE_LICENSE("GPL");
MODULE_ALIAS("nf-nat-" __stringify(AF_INET));
module_init(nf_nat_l3proto_ipv4_init);
module_exit(nf_nat_l3proto_ipv4_exit);

15
net/ipv4/netfilter/nf_nat_pptp.c
View File

@ -22,7 +22,6 @@
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_zones.h>
@ -47,7 +46,7 @@ static void pptp_nat_expected(struct nf_conn *ct,
struct nf_conntrack_tuple t;
const struct nf_ct_pptp_master *ct_pptp_info;
const struct nf_nat_pptp *nat_pptp_info;
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
ct_pptp_info = nfct_help_data(master);
nat_pptp_info = &nfct_nat(master)->help.nat_pptp_info;
@ -89,21 +88,21 @@ static void pptp_nat_expected(struct nf_conn *ct,
/* Change src to where master sends to */
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
range.min_addr = range.max_addr
= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
if (exp->dir == IP_CT_DIR_ORIGINAL) {
range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
range.min = range.max = exp->saved_proto;
range.min_proto = range.max_proto = exp->saved_proto;
}
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
/* For DST manip, map port here to where it's expected. */
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
range.min_addr = range.max_addr
= ct->master->tuplehash[!exp->dir].tuple.src.u3;
if (exp->dir == IP_CT_DIR_REPLY) {
range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
range.min = range.max = exp->saved_proto;
range.min_proto = range.max_proto = exp->saved_proto;
}
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
}

30
net/ipv4/netfilter/nf_nat_proto_gre.c
View File

@ -28,8 +28,7 @@
#include <linux/ip.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l4proto.h>
#include <linux/netfilter/nf_conntrack_proto_gre.h>
MODULE_LICENSE("GPL");
@ -38,8 +37,9 @@ MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
/* generate unique tuple ... */
static void
gre_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
gre_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)
{
@ -62,8 +62,8 @@ gre_unique_tuple(struct nf_conntrack_tuple *tuple,
min = 1;
range_size = 0xffff;
} else {
min = ntohs(range->min.gre.key);
range_size = ntohs(range->max.gre.key) - min + 1;
min = ntohs(range->min_proto.gre.key);
range_size = ntohs(range->max_proto.gre.key) - min + 1;
}
pr_debug("min = %u, range_size = %u\n", min, range_size);
@ -80,14 +80,14 @@ gre_unique_tuple(struct nf_conntrack_tuple *tuple,
/* manipulate a GRE packet according to maniptype */
static bool
gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
gre_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)
{
const struct gre_hdr *greh;
struct gre_hdr_pptp *pgreh;
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
unsigned int hdroff = iphdroff + iph->ihl * 4;
/* pgreh includes two optional 32bit fields which are not required
* to be there. That's where the magic '8' comes from */
@ -117,24 +117,24 @@ gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff,
return true;
}
static const struct nf_nat_protocol gre = {
.protonum = IPPROTO_GRE,
static const struct nf_nat_l4proto gre = {
.l4proto = IPPROTO_GRE,
.manip_pkt = gre_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = gre_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_gre_init(void)
{
return nf_nat_protocol_register(&gre);
return nf_nat_l4proto_register(NFPROTO_IPV4, &gre);
}
static void __exit nf_nat_proto_gre_fini(void)
{
nf_nat_protocol_unregister(&gre);
nf_nat_l4proto_unregister(NFPROTO_IPV4, &gre);
}
module_init(nf_nat_proto_gre_init);

24
net/ipv4/netfilter/nf_nat_proto_icmp.c
View File

@ -15,8 +15,7 @@
#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l4proto.h>
static bool
icmp_in_range(const struct nf_conntrack_tuple *tuple,
@ -29,8 +28,9 @@ icmp_in_range(const struct nf_conntrack_tuple *tuple,
}
static void
icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
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)
{
@ -38,13 +38,14 @@ icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
unsigned int range_size;
unsigned int i;
range_size = ntohs(range->max.icmp.id) - ntohs(range->min.icmp.id) + 1;
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.icmp.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;
@ -54,13 +55,12 @@ icmp_unique_tuple(struct nf_conntrack_tuple *tuple,
static bool
icmp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
struct icmphdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
@ -72,12 +72,12 @@ icmp_manip_pkt(struct sk_buff *skb,
return true;
}
const struct nf_nat_protocol nf_nat_protocol_icmp = {
.protonum = IPPROTO_ICMP,
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 defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};

214
net/ipv4/netfilter/nf_nat_rule.c
View File

@ -1,214 +0,0 @@
/* (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.
*/
/* Everything about the rules for NAT. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/route.h>
#include <linux/bitops.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_rule.h>
#define NAT_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
(1 << NF_INET_POST_ROUTING) | \
(1 << NF_INET_LOCAL_OUT) | \
(1 << NF_INET_LOCAL_IN))
static const struct xt_table nat_table = {
.name = "nat",
.valid_hooks = NAT_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
};
/* Source NAT */
static unsigned int
ipt_snat_target(struct sk_buff *skb, const struct xt_action_param *par)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
NF_CT_ASSERT(par->hooknum == NF_INET_POST_ROUTING ||
par->hooknum == NF_INET_LOCAL_IN);
ct = nf_ct_get(skb, &ctinfo);
/* Connection must be valid and new. */
NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
ctinfo == IP_CT_RELATED_REPLY));
NF_CT_ASSERT(par->out != NULL);
return nf_nat_setup_info(ct, &mr->range[0], NF_NAT_MANIP_SRC);
}
static unsigned int
ipt_dnat_target(struct sk_buff *skb, const struct xt_action_param *par)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING ||
par->hooknum == NF_INET_LOCAL_OUT);
ct = nf_ct_get(skb, &ctinfo);
/* Connection must be valid and new. */
NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
return nf_nat_setup_info(ct, &mr->range[0], NF_NAT_MANIP_DST);
}
static int ipt_snat_checkentry(const struct xt_tgchk_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
/* Must be a valid range */
if (mr->rangesize != 1) {
pr_info("SNAT: multiple ranges no longer supported\n");
return -EINVAL;
}
return 0;
}
static int ipt_dnat_checkentry(const struct xt_tgchk_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
/* Must be a valid range */
if (mr->rangesize != 1) {
pr_info("DNAT: multiple ranges no longer supported\n");
return -EINVAL;
}
return 0;
}
static unsigned int
alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
{
/* Force range to this IP; let proto decide mapping for
per-proto parts (hence not NF_NAT_RANGE_PROTO_SPECIFIED).
*/
struct nf_nat_ipv4_range range;
range.flags = 0;
pr_debug("Allocating NULL binding for %p (%pI4)\n", ct,
HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip :
&ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3.ip);
return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
}
int nf_nat_rule_find(struct sk_buff *skb,
unsigned int hooknum,
const struct net_device *in,
const struct net_device *out,
struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
int ret;
ret = ipt_do_table(skb, hooknum, in, out, net->ipv4.nat_table);
if (ret == NF_ACCEPT) {
if (!nf_nat_initialized(ct, HOOK2MANIP(hooknum)))
/* NUL mapping */
ret = alloc_null_binding(ct, hooknum);
}
return ret;
}
static struct xt_target ipt_snat_reg __read_mostly = {
.name = "SNAT",
.target = ipt_snat_target,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.table = "nat",
.hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_LOCAL_IN),
.checkentry = ipt_snat_checkentry,
.family = AF_INET,
};
static struct xt_target ipt_dnat_reg __read_mostly = {
.name = "DNAT",
.target = ipt_dnat_target,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.table = "nat",
.hooks = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT),
.checkentry = ipt_dnat_checkentry,
.family = AF_INET,
};
static int __net_init nf_nat_rule_net_init(struct net *net)
{
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&nat_table);
if (repl == NULL)
return -ENOMEM;
net->ipv4.nat_table = ipt_register_table(net, &nat_table, repl);
kfree(repl);
if (IS_ERR(net->ipv4.nat_table))
return PTR_ERR(net->ipv4.nat_table);
return 0;
}
static void __net_exit nf_nat_rule_net_exit(struct net *net)
{
ipt_unregister_table(net, net->ipv4.nat_table);
}
static struct pernet_operations nf_nat_rule_net_ops = {
.init = nf_nat_rule_net_init,
.exit = nf_nat_rule_net_exit,
};
int __init nf_nat_rule_init(void)
{
int ret;
ret = register_pernet_subsys(&nf_nat_rule_net_ops);
if (ret != 0)
goto out;
ret = xt_register_target(&ipt_snat_reg);
if (ret != 0)
goto unregister_table;
ret = xt_register_target(&ipt_dnat_reg);
if (ret != 0)
goto unregister_snat;
return ret;
unregister_snat:
xt_unregister_target(&ipt_snat_reg);
unregister_table:
unregister_pernet_subsys(&nf_nat_rule_net_ops);
out:
return ret;
}
void nf_nat_rule_cleanup(void)
{
xt_unregister_target(&ipt_dnat_reg);
xt_unregister_target(&ipt_snat_reg);
unregister_pernet_subsys(&nf_nat_rule_net_ops);
}

19
net/ipv4/netfilter/nf_nat_sip.c
View File

@ -19,7 +19,6 @@
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_sip.h>
@ -255,15 +254,15 @@ static void ip_nat_sip_seq_adjust(struct sk_buff *skb, s16 off)
static void ip_nat_sip_expected(struct nf_conn *ct,
struct nf_conntrack_expect *exp)
{
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
/* This must be a fresh one. */
BUG_ON(ct->status & IPS_NAT_DONE_MASK);
/* For DST manip, map port here to where it's expected. */
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
range.min = range.max = exp->saved_proto;
range.min_ip = range.max_ip = exp->saved_ip;
range.min_proto = range.max_proto = exp->saved_proto;
range.min_addr = range.max_addr = exp->saved_addr;
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
/* Change src to where master sends to, but only if the connection
@ -271,8 +270,8 @@ static void ip_nat_sip_expected(struct nf_conn *ct,
if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip ==
ct->master->tuplehash[exp->dir].tuple.src.u3.ip) {
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
range.min_addr = range.max_addr
= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
}
}
@ -307,7 +306,7 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
else
port = ntohs(exp->tuple.dst.u.udp.port);
exp->saved_ip = exp->tuple.dst.u3.ip;
exp->saved_addr = exp->tuple.dst.u3;
exp->tuple.dst.u3.ip = newip;
exp->saved_proto.udp.port = exp->tuple.dst.u.udp.port;
exp->dir = !dir;
@ -329,7 +328,7 @@ static unsigned int ip_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
if (port == 0)
return NF_DROP;
if (exp->tuple.dst.u3.ip != exp->saved_ip ||
if (exp->tuple.dst.u3.ip != exp->saved_addr.ip ||
exp->tuple.dst.u.udp.port != exp->saved_proto.udp.port) {
buflen = sprintf(buffer, "%pI4:%u", &newip, port);
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
@ -485,13 +484,13 @@ static unsigned int ip_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
else
rtp_addr->ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
rtp_exp->saved_ip = rtp_exp->tuple.dst.u3.ip;
rtp_exp->saved_addr = rtp_exp->tuple.dst.u3;
rtp_exp->tuple.dst.u3.ip = rtp_addr->ip;
rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
rtp_exp->dir = !dir;
rtp_exp->expectfn = ip_nat_sip_expected;
rtcp_exp->saved_ip = rtcp_exp->tuple.dst.u3.ip;
rtcp_exp->saved_addr = rtcp_exp->tuple.dst.u3;
rtcp_exp->tuple.dst.u3.ip = rtp_addr->ip;
rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
rtcp_exp->dir = !dir;

1
net/ipv4/netfilter/nf_nat_tftp.c
View File

@ -11,7 +11,6 @@
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_nat_rule.h>
#include <linux/netfilter/nf_conntrack_tftp.h>
MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");

24
net/netfilter/Kconfig
View File

@ -356,6 +356,30 @@ config NETFILTER_NETLINK_QUEUE_CT
If this option is enabled, NFQUEUE can include Connection Tracking
information together with the packet is the enqueued via NFNETLINK.
config NF_NAT
tristate
config NF_NAT_NEEDED
bool
depends on NF_NAT
default y
config NF_NAT_PROTO_DCCP
tristate
depends on NF_NAT && NF_CT_PROTO_DCCP
default NF_NAT && NF_CT_PROTO_DCCP
config NF_NAT_PROTO_UDPLITE
tristate
depends on NF_NAT && NF_CT_PROTO_UDPLITE
default NF_NAT && NF_CT_PROTO_UDPLITE
config NF_NAT_PROTO_SCTP
tristate
default NF_NAT && NF_CT_PROTO_SCTP
depends on NF_NAT && NF_CT_PROTO_SCTP
select LIBCRC32C
endif # NF_CONNTRACK
# transparent proxy support

11
net/netfilter/Makefile
View File

@ -43,6 +43,17 @@ obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
nf_nat-y := nf_nat_core.o nf_nat_proto_unknown.o nf_nat_proto_common.o \
nf_nat_proto_udp.o nf_nat_proto_tcp.o nf_nat_helper.o
obj-$(CONFIG_NF_NAT) += nf_nat.o
obj-$(CONFIG_NF_NAT) += xt_nat.o
# NAT protocols (nf_nat)
obj-$(CONFIG_NF_NAT_PROTO_DCCP) += nf_nat_proto_dccp.o
obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
# transparent proxy support
obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o

5
net/netfilter/core.c
View File

@ -275,6 +275,11 @@ EXPORT_SYMBOL_GPL(nfq_ct_nat_hook);
#endif /* CONFIG_NF_CONNTRACK */
#ifdef CONFIG_NF_NAT_NEEDED
void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
EXPORT_SYMBOL(nf_nat_decode_session_hook);
#endif
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc_net_netfilter;
EXPORT_SYMBOL(proc_net_netfilter);

6
net/netfilter/nf_conntrack_core.c
View File

@ -55,6 +55,12 @@ int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct,
const struct nlattr *attr) __read_mostly;
EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook);
int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int protoff);
EXPORT_SYMBOL_GPL(nf_nat_seq_adjust_hook);
DEFINE_SPINLOCK(nf_conntrack_lock);
EXPORT_SYMBOL_GPL(nf_conntrack_lock);

35
net/netfilter/nf_conntrack_netlink.c
View File

@ -45,7 +45,7 @@
#include <net/netfilter/nf_conntrack_timestamp.h>
#ifdef CONFIG_NF_NAT_NEEDED
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_helper.h>
#endif
@ -1096,13 +1096,14 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
const struct nlattr *attr)
{
typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
int err;
parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
if (!parse_nat_setup) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock();
if (request_module("nf-nat-ipv4") < 0) {
if (request_module("nf-nat") < 0) {
nfnl_lock();
rcu_read_lock();
return -EOPNOTSUPP;
@ -1115,7 +1116,26 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
return -EOPNOTSUPP;
}
return parse_nat_setup(ct, manip, attr);
err = parse_nat_setup(ct, manip, attr);
if (err == -EAGAIN) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
spin_unlock_bh(&nf_conntrack_lock);
nfnl_unlock();
if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
nfnl_lock();
spin_lock_bh(&nf_conntrack_lock);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock();
spin_lock_bh(&nf_conntrack_lock);
rcu_read_lock();
#else
err = -EOPNOTSUPP;
#endif
}
return err;
}
#endif
@ -1979,6 +1999,8 @@ nla_put_failure:
return -1;
}
static const union nf_inet_addr any_addr;
static int
ctnetlink_exp_dump_expect(struct sk_buff *skb,
const struct nf_conntrack_expect *exp)
@ -2005,7 +2027,8 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
goto nla_put_failure;
#ifdef CONFIG_NF_NAT_NEEDED
if (exp->saved_ip || exp->saved_proto.all) {
if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
exp->saved_proto.all) {
nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
@ -2014,7 +2037,7 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
goto nla_put_failure;
nat_tuple.src.l3num = nf_ct_l3num(master);
nat_tuple.src.u3.ip = exp->saved_ip;
nat_tuple.src.u3 = exp->saved_addr;
nat_tuple.dst.protonum = nf_ct_protonum(master);
nat_tuple.src.u = exp->saved_proto;
@ -2410,7 +2433,7 @@ ctnetlink_parse_expect_nat(const struct nlattr *attr,
if (err < 0)
return err;
exp->saved_ip = nat_tuple.src.u3.ip;
exp->saved_addr = nat_tuple.src.u3;
exp->saved_proto = nat_tuple.src.u;
exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));

8
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -505,10 +505,10 @@ static inline s16 nat_offset(const struct nf_conn *ct,
return get_offset != NULL ? get_offset(ct, dir, seq) : 0;
}
#define NAT_OFFSET(pf, ct, dir, seq) \
(pf == NFPROTO_IPV4 ? nat_offset(ct, dir, seq) : 0)
#define NAT_OFFSET(ct, dir, seq) \
(nat_offset(ct, dir, seq))
#else
#define NAT_OFFSET(pf, ct, dir, seq) 0
#define NAT_OFFSET(ct, dir, seq) 0
#endif
static bool tcp_in_window(const struct nf_conn *ct,
@ -541,7 +541,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
tcp_sack(skb, dataoff, tcph, &sack);
/* Take into account NAT sequence number mangling */
receiver_offset = NAT_OFFSET(pf, ct, !dir, ack - 1);
receiver_offset = NAT_OFFSET(ct, !dir, ack - 1);
ack -= receiver_offset;
sack -= receiver_offset;

6
net/netfilter/nf_conntrack_sip.c
View File

@ -946,11 +946,11 @@ static int set_expected_rtp_rtcp(struct sk_buff *skb, unsigned int protoff,
break;
#ifdef CONFIG_NF_NAT_NEEDED
if (exp->tuple.src.l3num == AF_INET && !direct_rtp &&
(exp->saved_ip != exp->tuple.dst.u3.ip ||
(exp->saved_addr.ip != exp->tuple.dst.u3.ip ||
exp->saved_proto.udp.port != exp->tuple.dst.u.udp.port) &&
ct->status & IPS_NAT_MASK) {
daddr->ip = exp->saved_ip;
tuple.dst.u3.ip = exp->saved_ip;
daddr->ip = exp->saved_addr.ip;
tuple.dst.u3.ip = exp->saved_addr.ip;
tuple.dst.u.udp.port = exp->saved_proto.udp.port;
direct_rtp = 1;
} else

683
net/ipv4/netfilter/nf_nat_core.c → net/netfilter/nf_nat_core.c
View File

@ -1,7 +1,7 @@
/* NAT for netfilter; shared with compatibility layer. */
/* (C) 1999-2001 Paul `Rusty' Russell
/*
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2011 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
@ -13,39 +13,106 @@
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/gfp.h>
#include <net/checksum.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/tcp.h> /* For tcp_prot in getorigdst */
#include <linux/icmp.h>
#include <linux/udp.h>
#include <net/xfrm.h>
#include <linux/jhash.h>
#include <linux/rtnetlink.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_helper.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <linux/netfilter/nf_nat.h>
static DEFINE_SPINLOCK(nf_nat_lock);
static struct nf_conntrack_l3proto *l3proto __read_mostly;
#define MAX_IP_NAT_PROTO 256
static const struct nf_nat_protocol __rcu *nf_nat_protos[MAX_IP_NAT_PROTO]
static DEFINE_MUTEX(nf_nat_proto_mutex);
static const struct nf_nat_l3proto __rcu *nf_nat_l3protos[NFPROTO_NUMPROTO]
__read_mostly;
static const struct nf_nat_l4proto __rcu **nf_nat_l4protos[NFPROTO_NUMPROTO]
__read_mostly;
static inline const struct nf_nat_protocol *
__nf_nat_proto_find(u_int8_t protonum)
inline const struct nf_nat_l3proto *
__nf_nat_l3proto_find(u8 family)
{
return rcu_dereference(nf_nat_protos[protonum]);
return rcu_dereference(nf_nat_l3protos[family]);
}
inline const struct nf_nat_l4proto *
__nf_nat_l4proto_find(u8 family, u8 protonum)
{
return rcu_dereference(nf_nat_l4protos[family][protonum]);
}
EXPORT_SYMBOL_GPL(__nf_nat_l4proto_find);
#ifdef CONFIG_XFRM
static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl)
{
const struct nf_nat_l3proto *l3proto;
const struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
enum ip_conntrack_dir dir;
unsigned long statusbit;
u8 family;
ct = nf_ct_get(skb, &ctinfo);
if (ct == NULL)
return;
family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
rcu_read_lock();
l3proto = __nf_nat_l3proto_find(family);
if (l3proto == NULL)
goto out;
dir = CTINFO2DIR(ctinfo);
if (dir == IP_CT_DIR_ORIGINAL)
statusbit = IPS_DST_NAT;
else
statusbit = IPS_SRC_NAT;
l3proto->decode_session(skb, ct, dir, statusbit, fl);
out:
rcu_read_unlock();
}
int nf_xfrm_me_harder(struct sk_buff *skb, unsigned int family)
{
struct flowi fl;
unsigned int hh_len;
struct dst_entry *dst;
if (xfrm_decode_session(skb, &fl, family) < 0)
return -1;
dst = skb_dst(skb);
if (dst->xfrm)
dst = ((struct xfrm_dst *)dst)->route;
dst_hold(dst);
dst = xfrm_lookup(dev_net(dst->dev), dst, &fl, skb->sk, 0);
if (IS_ERR(dst))
return -1;
skb_dst_drop(skb);
skb_dst_set(skb, dst);
/* Change in oif may mean change in hh_len. */
hh_len = skb_dst(skb)->dev->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
return -1;
return 0;
}
EXPORT_SYMBOL(nf_xfrm_me_harder);
#endif /* CONFIG_XFRM */
/* We keep an extra hash for each conntrack, for fast searching. */
static inline unsigned int
hash_by_src(const struct net *net, u16 zone,
@ -54,10 +121,9 @@ hash_by_src(const struct net *net, u16 zone,
unsigned int hash;
/* Original src, to ensure we map it consistently if poss. */
hash = jhash_3words((__force u32)tuple->src.u3.ip,
(__force u32)tuple->src.u.all ^ zone,
tuple->dst.protonum, nf_conntrack_hash_rnd);
return ((u64)hash * net->ipv4.nat_htable_size) >> 32;
hash = jhash2((u32 *)&tuple->src, sizeof(tuple->src) / sizeof(u32),
tuple->dst.protonum ^ zone ^ nf_conntrack_hash_rnd);
return ((u64)hash * net->ct.nat_htable_size) >> 32;
}
/* Is this tuple already taken? (not by us) */
@ -66,10 +132,11 @@ nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
const struct nf_conn *ignored_conntrack)
{
/* Conntrack tracking doesn't keep track of outgoing tuples; only
incoming ones. NAT means they don't have a fixed mapping,
so we invert the tuple and look for the incoming reply.
We could keep a separate hash if this proves too slow. */
* incoming ones. NAT means they don't have a fixed mapping,
* so we invert the tuple and look for the incoming reply.
*
* We could keep a separate hash if this proves too slow.
*/
struct nf_conntrack_tuple reply;
nf_ct_invert_tuplepr(&reply, tuple);
@ -78,31 +145,26 @@ nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
EXPORT_SYMBOL(nf_nat_used_tuple);
/* If we source map this tuple so reply looks like reply_tuple, will
* that meet the constraints of range. */
static int
in_range(const struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range)
* that meet the constraints of range.
*/
static int in_range(const struct nf_nat_l3proto *l3proto,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *tuple,
const struct nf_nat_range *range)
{
const struct nf_nat_protocol *proto;
int ret = 0;
/* If we are supposed to map IPs, then we must be in the
range specified, otherwise let this drag us onto a new src IP. */
if (range->flags & NF_NAT_RANGE_MAP_IPS) {
if (ntohl(tuple->src.u3.ip) < ntohl(range->min_ip) ||
ntohl(tuple->src.u3.ip) > ntohl(range->max_ip))
return 0;
}
* range specified, otherwise let this drag us onto a new src IP.
*/
if (range->flags & NF_NAT_RANGE_MAP_IPS &&
!l3proto->in_range(tuple, range))
return 0;
rcu_read_lock();
proto = __nf_nat_proto_find(tuple->dst.protonum);
if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) ||
proto->in_range(tuple, NF_NAT_MANIP_SRC,
&range->min, &range->max))
ret = 1;
rcu_read_unlock();
l4proto->in_range(tuple, NF_NAT_MANIP_SRC,
&range->min_proto, &range->max_proto))
return 1;
return ret;
return 0;
}
static inline int
@ -113,24 +175,25 @@ same_src(const struct nf_conn *ct,
t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
return (t->dst.protonum == tuple->dst.protonum &&
t->src.u3.ip == tuple->src.u3.ip &&
nf_inet_addr_cmp(&t->src.u3, &tuple->src.u3) &&
t->src.u.all == tuple->src.u.all);
}
/* Only called for SRC manip */
static int
find_appropriate_src(struct net *net, u16 zone,
const struct nf_nat_l3proto *l3proto,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *result,
const struct nf_nat_ipv4_range *range)
const struct nf_nat_range *range)
{
unsigned int h = hash_by_src(net, zone, tuple);
const struct nf_conn_nat *nat;
const struct nf_conn *ct;
const struct hlist_node *n;
rcu_read_lock();
hlist_for_each_entry_rcu(nat, n, &net->ipv4.nat_bysource[h], bysource) {
hlist_for_each_entry_rcu(nat, n, &net->ct.nat_bysource[h], bysource) {
ct = nat->ct;
if (same_src(ct, tuple) && nf_ct_zone(ct) == zone) {
/* Copy source part from reply tuple. */
@ -138,119 +201,150 @@ find_appropriate_src(struct net *net, u16 zone,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
result->dst = tuple->dst;
if (in_range(result, range)) {
if (in_range(l3proto, l4proto, result, range)) {
rcu_read_unlock();
return 1;
}
}
}
rcu_read_unlock();
return 0;
}
/* For [FUTURE] fragmentation handling, we want the least-used
src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus
if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
1-65535, we don't do pro-rata allocation based on ports; we choose
the ip with the lowest src-ip/dst-ip/proto usage.
*/
* src-ip/dst-ip/proto triple. Fairness doesn't come into it. Thus
* if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
* 1-65535, we don't do pro-rata allocation based on ports; we choose
* the ip with the lowest src-ip/dst-ip/proto usage.
*/
static void
find_best_ips_proto(u16 zone, struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
const struct nf_nat_range *range,
const struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
__be32 *var_ipp;
union nf_inet_addr *var_ipp;
unsigned int i, max;
/* Host order */
u_int32_t minip, maxip, j;
u32 minip, maxip, j, dist;
bool full_range;
/* No IP mapping? Do nothing. */
if (!(range->flags & NF_NAT_RANGE_MAP_IPS))
return;
if (maniptype == NF_NAT_MANIP_SRC)
var_ipp = &tuple->src.u3.ip;
var_ipp = &tuple->src.u3;
else
var_ipp = &tuple->dst.u3.ip;
var_ipp = &tuple->dst.u3;
/* Fast path: only one choice. */
if (range->min_ip == range->max_ip) {
*var_ipp = range->min_ip;
if (nf_inet_addr_cmp(&range->min_addr, &range->max_addr)) {
*var_ipp = range->min_addr;
return;
}
if (nf_ct_l3num(ct) == NFPROTO_IPV4)
max = sizeof(var_ipp->ip) / sizeof(u32) - 1;
else
max = sizeof(var_ipp->ip6) / sizeof(u32) - 1;
/* Hashing source and destination IPs gives a fairly even
* spread in practice (if there are a small number of IPs
* involved, there usually aren't that many connections
* anyway). The consistency means that servers see the same
* client coming from the same IP (some Internet Banking sites
* like this), even across reboots. */
minip = ntohl(range->min_ip);
maxip = ntohl(range->max_ip);
j = jhash_2words((__force u32)tuple->src.u3.ip,
range->flags & NF_NAT_RANGE_PERSISTENT ?
0 : (__force u32)tuple->dst.u3.ip ^ zone, 0);
j = ((u64)j * (maxip - minip + 1)) >> 32;
*var_ipp = htonl(minip + j);
* like this), even across reboots.
*/
j = jhash2((u32 *)&tuple->src.u3, sizeof(tuple->src.u3),
range->flags & NF_NAT_RANGE_PERSISTENT ?
0 : (__force u32)tuple->dst.u3.all[max] ^ zone);
full_range = false;
for (i = 0; i <= max; i++) {
/* If first bytes of the address are at the maximum, use the
* distance. Otherwise use the full range.
*/
if (!full_range) {
minip = ntohl((__force __be32)range->min_addr.all[i]);
maxip = ntohl((__force __be32)range->max_addr.all[i]);
dist = maxip - minip + 1;
} else {
minip = 0;
dist = ~0;
}
var_ipp->all[i] = (__force __u32)
htonl(minip + (((u64)j * dist) >> 32));
if (var_ipp->all[i] != range->max_addr.all[i])
full_range = true;
if (!(range->flags & NF_NAT_RANGE_PERSISTENT))
j ^= (__force u32)tuple->dst.u3.all[i];
}
}
/* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING,
* we change the source to map into the range. For NF_INET_PRE_ROUTING
/* Manipulate the tuple into the range given. For NF_INET_POST_ROUTING,
* we change the source to map into the range. For NF_INET_PRE_ROUTING
* and NF_INET_LOCAL_OUT, we change the destination to map into the
* range. It might not be possible to get a unique tuple, but we try.
* range. It might not be possible to get a unique tuple, but we try.
* At worst (or if we race), we will end up with a final duplicate in
* __ip_conntrack_confirm and drop the packet. */
static void
get_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig_tuple,
const struct nf_nat_ipv4_range *range,
const struct nf_nat_range *range,
struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
const struct nf_nat_l3proto *l3proto;
const struct nf_nat_l4proto *l4proto;
struct net *net = nf_ct_net(ct);
const struct nf_nat_protocol *proto;
u16 zone = nf_ct_zone(ct);
/* 1) If this srcip/proto/src-proto-part is currently mapped,
and that same mapping gives a unique tuple within the given
range, use that.
rcu_read_lock();
l3proto = __nf_nat_l3proto_find(orig_tuple->src.l3num);
l4proto = __nf_nat_l4proto_find(orig_tuple->src.l3num,
orig_tuple->dst.protonum);
This is only required for source (ie. NAT/masq) mappings.
So far, we don't do local source mappings, so multiple
manips not an issue. */
/* 1) If this srcip/proto/src-proto-part is currently mapped,
* and that same mapping gives a unique tuple within the given
* range, use that.
*
* This is only required for source (ie. NAT/masq) mappings.
* So far, we don't do local source mappings, so multiple
* manips not an issue.
*/
if (maniptype == NF_NAT_MANIP_SRC &&
!(range->flags & NF_NAT_RANGE_PROTO_RANDOM)) {
/* try the original tuple first */
if (in_range(orig_tuple, range)) {
if (in_range(l3proto, l4proto, orig_tuple, range)) {
if (!nf_nat_used_tuple(orig_tuple, ct)) {
*tuple = *orig_tuple;
return;
goto out;
}
} else if (find_appropriate_src(net, zone, orig_tuple, tuple,
range)) {
} else if (find_appropriate_src(net, zone, l3proto, l4proto,
orig_tuple, tuple, range)) {
pr_debug("get_unique_tuple: Found current src map\n");
if (!nf_nat_used_tuple(tuple, ct))
return;
goto out;
}
}
/* 2) Select the least-used IP/proto combination in the given
range. */
/* 2) Select the least-used IP/proto combination in the given range */
*tuple = *orig_tuple;
find_best_ips_proto(zone, tuple, range, ct, maniptype);
/* 3) The per-protocol part of the manip is made to map into
the range to make a unique tuple. */
rcu_read_lock();
proto = __nf_nat_proto_find(orig_tuple->dst.protonum);
* the range to make a unique tuple.
*/
/* Only bother mapping if it's not already in range and unique */
if (!(range->flags & NF_NAT_RANGE_PROTO_RANDOM)) {
if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
if (proto->in_range(tuple, maniptype, &range->min,
&range->max) &&
(range->min.all == range->max.all ||
if (l4proto->in_range(tuple, maniptype,
&range->min_proto,
&range->max_proto) &&
(range->min_proto.all == range->max_proto.all ||
!nf_nat_used_tuple(tuple, ct)))
goto out;
} else if (!nf_nat_used_tuple(tuple, ct)) {
@ -259,14 +353,14 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
}
/* Last change: get protocol to try to obtain unique tuple. */
proto->unique_tuple(tuple, range, maniptype, ct);
l4proto->unique_tuple(l3proto, tuple, range, maniptype, ct);
out:
rcu_read_unlock();
}
unsigned int
nf_nat_setup_info(struct nf_conn *ct,
const struct nf_nat_ipv4_range *range,
const struct nf_nat_range *range,
enum nf_nat_manip_type maniptype)
{
struct net *net = nf_ct_net(ct);
@ -288,10 +382,10 @@ nf_nat_setup_info(struct nf_conn *ct,
BUG_ON(nf_nat_initialized(ct, maniptype));
/* What we've got will look like inverse of reply. Normally
this is what is in the conntrack, except for prior
manipulations (future optimization: if num_manips == 0,
orig_tp =
conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */
* this is what is in the conntrack, except for prior
* manipulations (future optimization: if num_manips == 0,
* orig_tp = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
*/
nf_ct_invert_tuplepr(&curr_tuple,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
@ -317,11 +411,11 @@ nf_nat_setup_info(struct nf_conn *ct,
srchash = hash_by_src(net, nf_ct_zone(ct),
&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
spin_lock_bh(&nf_nat_lock);
/* nf_conntrack_alter_reply might re-allocate extension area */
/* nf_conntrack_alter_reply might re-allocate extension aera */
nat = nfct_nat(ct);
nat->ct = ct;
hlist_add_head_rcu(&nat->bysource,
&net->ipv4.nat_bysource[srchash]);
&net->ct.nat_bysource[srchash]);
spin_unlock_bh(&nf_nat_lock);
}
@ -335,47 +429,14 @@ nf_nat_setup_info(struct nf_conn *ct,
}
EXPORT_SYMBOL(nf_nat_setup_info);
/* Returns true if succeeded. */
static bool
manip_pkt(u_int16_t proto,
struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_conntrack_tuple *target,
enum nf_nat_manip_type maniptype)
{
struct iphdr *iph;
const struct nf_nat_protocol *p;
if (!skb_make_writable(skb, iphdroff + sizeof(*iph)))
return false;
iph = (void *)skb->data + iphdroff;
/* Manipulate protcol part. */
/* rcu_read_lock()ed by nf_hook_slow */
p = __nf_nat_proto_find(proto);
if (!p->manip_pkt(skb, iphdroff, target, maniptype))
return false;
iph = (void *)skb->data + iphdroff;
if (maniptype == NF_NAT_MANIP_SRC) {
csum_replace4(&iph->check, iph->saddr, target->src.u3.ip);
iph->saddr = target->src.u3.ip;
} else {
csum_replace4(&iph->check, iph->daddr, target->dst.u3.ip);
iph->daddr = target->dst.u3.ip;
}
return true;
}
/* Do packet manipulations according to nf_nat_setup_info. */
unsigned int nf_nat_packet(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum,
struct sk_buff *skb)
{
const struct nf_nat_l3proto *l3proto;
const struct nf_nat_l4proto *l4proto;
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned long statusbit;
enum nf_nat_manip_type mtype = HOOK2MANIP(hooknum);
@ -396,129 +457,174 @@ unsigned int nf_nat_packet(struct nf_conn *ct,
/* We are aiming to look like inverse of other direction. */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
if (!manip_pkt(target.dst.protonum, skb, 0, &target, mtype))
l3proto = __nf_nat_l3proto_find(target.src.l3num);
l4proto = __nf_nat_l4proto_find(target.src.l3num,
target.dst.protonum);
if (!l3proto->manip_pkt(skb, 0, l4proto, &target, mtype))
return NF_DROP;
}
return NF_ACCEPT;
}
EXPORT_SYMBOL_GPL(nf_nat_packet);
/* Dir is direction ICMP is coming from (opposite to packet it contains) */
int nf_nat_icmp_reply_translation(struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
unsigned int hooknum,
struct sk_buff *skb)
struct nf_nat_proto_clean {
u8 l3proto;
u8 l4proto;
bool hash;
};
/* Clear NAT section of all conntracks, in case we're loaded again. */
static int nf_nat_proto_clean(struct nf_conn *i, void *data)
{
struct {
struct icmphdr icmp;
struct iphdr ip;
} *inside;
struct nf_conntrack_tuple target;
int hdrlen = ip_hdrlen(skb);
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
unsigned long statusbit;
enum nf_nat_manip_type manip = HOOK2MANIP(hooknum);
const struct nf_nat_proto_clean *clean = data;
struct nf_conn_nat *nat = nfct_nat(i);
if (!skb_make_writable(skb, hdrlen + sizeof(*inside)))
if (!nat)
return 0;
if ((clean->l3proto && nf_ct_l3num(i) != clean->l3proto) ||
(clean->l4proto && nf_ct_protonum(i) != clean->l4proto))
return 0;
inside = (void *)skb->data + hdrlen;
/* We're actually going to mangle it beyond trivial checksum
adjustment, so make sure the current checksum is correct. */
if (nf_ip_checksum(skb, hooknum, hdrlen, 0))
return 0;
/* Must be RELATED */
NF_CT_ASSERT(skb->nfctinfo == IP_CT_RELATED ||
skb->nfctinfo == IP_CT_RELATED_REPLY);
/* Redirects on non-null nats must be dropped, else they'll
start talking to each other without our translation, and be
confused... --RR */
if (inside->icmp.type == ICMP_REDIRECT) {
/* If NAT isn't finished, assume it and drop. */
if ((ct->status & IPS_NAT_DONE_MASK) != IPS_NAT_DONE_MASK)
return 0;
if (ct->status & IPS_NAT_MASK)
return 0;
if (clean->hash) {
spin_lock_bh(&nf_nat_lock);
hlist_del_rcu(&nat->bysource);
spin_unlock_bh(&nf_nat_lock);
} else {
memset(nat, 0, sizeof(*nat));
i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK |
IPS_SEQ_ADJUST);
}
if (manip == NF_NAT_MANIP_SRC)
statusbit = IPS_SRC_NAT;
else
statusbit = IPS_DST_NAT;
/* Invert if this is reply dir. */
if (dir == IP_CT_DIR_REPLY)
statusbit ^= IPS_NAT_MASK;
if (!(ct->status & statusbit))
return 1;
pr_debug("icmp_reply_translation: translating error %p manip %u "
"dir %s\n", skb, manip,
dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
/* Change inner back to look like incoming packet. We do the
opposite manip on this hook to normal, because it might not
pass all hooks (locally-generated ICMP). Consider incoming
packet: PREROUTING (DST manip), routing produces ICMP, goes
through POSTROUTING (which must correct the DST manip). */
if (!manip_pkt(inside->ip.protocol, skb, hdrlen + sizeof(inside->icmp),
&ct->tuplehash[!dir].tuple, !manip))
return 0;
if (skb->ip_summed != CHECKSUM_PARTIAL) {
/* Reloading "inside" here since manip_pkt inner. */
inside = (void *)skb->data + hdrlen;
inside->icmp.checksum = 0;
inside->icmp.checksum =
csum_fold(skb_checksum(skb, hdrlen,
skb->len - hdrlen, 0));
}
/* Change outer to look the reply to an incoming packet
* (proto 0 means don't invert per-proto part). */
nf_ct_invert_tuplepr(&target, &ct->tuplehash[!dir].tuple);
if (!manip_pkt(0, skb, 0, &target, manip))
return 0;
return 1;
return 0;
}
static void nf_nat_l4proto_clean(u8 l3proto, u8 l4proto)
{
struct nf_nat_proto_clean clean = {
.l3proto = l3proto,
.l4proto = l4proto,
};
struct net *net;
rtnl_lock();
/* Step 1 - remove from bysource hash */
clean.hash = true;
for_each_net(net)
nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean);
synchronize_rcu();
/* Step 2 - clean NAT section */
clean.hash = false;
for_each_net(net)
nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean);
rtnl_unlock();
}
static void nf_nat_l3proto_clean(u8 l3proto)
{
struct nf_nat_proto_clean clean = {
.l3proto = l3proto,
};
struct net *net;
rtnl_lock();
/* Step 1 - remove from bysource hash */
clean.hash = true;
for_each_net(net)
nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean);
synchronize_rcu();
/* Step 2 - clean NAT section */
clean.hash = false;
for_each_net(net)
nf_ct_iterate_cleanup(net, nf_nat_proto_clean, &clean);
rtnl_unlock();
}
EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation);
/* Protocol registration. */
int nf_nat_protocol_register(const struct nf_nat_protocol *proto)
int nf_nat_l4proto_register(u8 l3proto, const struct nf_nat_l4proto *l4proto)
{
const struct nf_nat_l4proto **l4protos;
unsigned int i;
int ret = 0;
spin_lock_bh(&nf_nat_lock);
mutex_lock(&nf_nat_proto_mutex);
if (nf_nat_l4protos[l3proto] == NULL) {
l4protos = kmalloc(IPPROTO_MAX * sizeof(struct nf_nat_l4proto *),
GFP_KERNEL);
if (l4protos == NULL) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < IPPROTO_MAX; i++)
RCU_INIT_POINTER(l4protos[i], &nf_nat_l4proto_unknown);
/* Before making proto_array visible to lockless readers,
* we must make sure its content is committed to memory.
*/
smp_wmb();
nf_nat_l4protos[l3proto] = l4protos;
}
if (rcu_dereference_protected(
nf_nat_protos[proto->protonum],
lockdep_is_held(&nf_nat_lock)
) != &nf_nat_unknown_protocol) {
nf_nat_l4protos[l3proto][l4proto->l4proto],
lockdep_is_held(&nf_nat_proto_mutex)
) != &nf_nat_l4proto_unknown) {
ret = -EBUSY;
goto out;
}
RCU_INIT_POINTER(nf_nat_protos[proto->protonum], proto);
RCU_INIT_POINTER(nf_nat_l4protos[l3proto][l4proto->l4proto], l4proto);
out:
spin_unlock_bh(&nf_nat_lock);
mutex_unlock(&nf_nat_proto_mutex);
return ret;
}
EXPORT_SYMBOL(nf_nat_protocol_register);
EXPORT_SYMBOL_GPL(nf_nat_l4proto_register);
/* No one stores the protocol anywhere; simply delete it. */
void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto)
void nf_nat_l4proto_unregister(u8 l3proto, const struct nf_nat_l4proto *l4proto)
{
spin_lock_bh(&nf_nat_lock);
RCU_INIT_POINTER(nf_nat_protos[proto->protonum],
&nf_nat_unknown_protocol);
spin_unlock_bh(&nf_nat_lock);
mutex_lock(&nf_nat_proto_mutex);
RCU_INIT_POINTER(nf_nat_l4protos[l3proto][l4proto->l4proto],
&nf_nat_l4proto_unknown);
mutex_unlock(&nf_nat_proto_mutex);
synchronize_rcu();
nf_nat_l4proto_clean(l3proto, l4proto->l4proto);
}
EXPORT_SYMBOL(nf_nat_protocol_unregister);
EXPORT_SYMBOL_GPL(nf_nat_l4proto_unregister);
int nf_nat_l3proto_register(const struct nf_nat_l3proto *l3proto)
{
int err;
err = nf_ct_l3proto_try_module_get(l3proto->l3proto);
if (err < 0)
return err;
mutex_lock(&nf_nat_proto_mutex);
RCU_INIT_POINTER(nf_nat_l4protos[l3proto->l3proto][IPPROTO_TCP],
&nf_nat_l4proto_tcp);
RCU_INIT_POINTER(nf_nat_l4protos[l3proto->l3proto][IPPROTO_UDP],
&nf_nat_l4proto_udp);
mutex_unlock(&nf_nat_proto_mutex);
RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], l3proto);
return 0;
}
EXPORT_SYMBOL_GPL(nf_nat_l3proto_register);
void nf_nat_l3proto_unregister(const struct nf_nat_l3proto *l3proto)
{
mutex_lock(&nf_nat_proto_mutex);
RCU_INIT_POINTER(nf_nat_l3protos[l3proto->l3proto], NULL);
mutex_unlock(&nf_nat_proto_mutex);
synchronize_rcu();
nf_nat_l3proto_clean(l3proto->l3proto);
nf_ct_l3proto_module_put(l3proto->l3proto);
}
EXPORT_SYMBOL_GPL(nf_nat_l3proto_unregister);
/* No one using conntrack by the time this called. */
static void nf_nat_cleanup_conntrack(struct nf_conn *ct)
@ -570,34 +676,34 @@ static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
static int nfnetlink_parse_nat_proto(struct nlattr *attr,
const struct nf_conn *ct,
struct nf_nat_ipv4_range *range)
struct nf_nat_range *range)
{
struct nlattr *tb[CTA_PROTONAT_MAX+1];
const struct nf_nat_protocol *npt;
const struct nf_nat_l4proto *l4proto;
int err;
err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
if (err < 0)
return err;
rcu_read_lock();
npt = __nf_nat_proto_find(nf_ct_protonum(ct));
if (npt->nlattr_to_range)
err = npt->nlattr_to_range(tb, range);
rcu_read_unlock();
l4proto = __nf_nat_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
if (l4proto->nlattr_to_range)
err = l4proto->nlattr_to_range(tb, range);
return err;
}
static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
[CTA_NAT_MINIP] = { .type = NLA_U32 },
[CTA_NAT_MAXIP] = { .type = NLA_U32 },
[CTA_NAT_V4_MINIP] = { .type = NLA_U32 },
[CTA_NAT_V4_MAXIP] = { .type = NLA_U32 },
[CTA_NAT_PROTO] = { .type = NLA_NESTED },
};
static int
nfnetlink_parse_nat(const struct nlattr *nat,
const struct nf_conn *ct, struct nf_nat_ipv4_range *range)
const struct nf_conn *ct, struct nf_nat_range *range)
{
const struct nf_nat_l3proto *l3proto;
struct nlattr *tb[CTA_NAT_MAX+1];
int err;
@ -607,25 +713,23 @@ nfnetlink_parse_nat(const struct nlattr *nat,
if (err < 0)
return err;
if (tb[CTA_NAT_MINIP])
range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
if (!tb[CTA_NAT_MAXIP])
range->max_ip = range->min_ip;
else
range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
if (range->min_ip)
range->flags |= NF_NAT_RANGE_MAP_IPS;
rcu_read_lock();
l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct));
if (l3proto == NULL) {
err = -EAGAIN;
goto out;
}
err = l3proto->nlattr_to_range(tb, range);
if (err < 0)
goto out;
if (!tb[CTA_NAT_PROTO])
return 0;
goto out;
err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
if (err < 0)
return err;
return 0;
out:
rcu_read_unlock();
return err;
}
static int
@ -633,10 +737,12 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr)
{
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
int err;
if (nfnetlink_parse_nat(attr, ct, &range) < 0)
return -EINVAL;
err = nfnetlink_parse_nat(attr, ct, &range);
if (err < 0)
return err;
if (nf_nat_initialized(ct, manip))
return -EEXIST;
@ -655,30 +761,20 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
static int __net_init nf_nat_net_init(struct net *net)
{
/* Leave them the same for the moment. */
net->ipv4.nat_htable_size = net->ct.htable_size;
net->ipv4.nat_bysource = nf_ct_alloc_hashtable(&net->ipv4.nat_htable_size, 0);
if (!net->ipv4.nat_bysource)
net->ct.nat_htable_size = net->ct.htable_size;
net->ct.nat_bysource = nf_ct_alloc_hashtable(&net->ct.nat_htable_size, 0);
if (!net->ct.nat_bysource)
return -ENOMEM;
return 0;
}
/* Clear NAT section of all conntracks, in case we're loaded again. */
static int clean_nat(struct nf_conn *i, void *data)
{
struct nf_conn_nat *nat = nfct_nat(i);
if (!nat)
return 0;
memset(nat, 0, sizeof(*nat));
i->status &= ~(IPS_NAT_MASK | IPS_NAT_DONE_MASK | IPS_SEQ_ADJUST);
return 0;
}
static void __net_exit nf_nat_net_exit(struct net *net)
{
nf_ct_iterate_cleanup(net, &clean_nat, NULL);
struct nf_nat_proto_clean clean = {};
nf_ct_iterate_cleanup(net, &nf_nat_proto_clean, &clean);
synchronize_rcu();
nf_ct_free_hashtable(net->ipv4.nat_bysource, net->ipv4.nat_htable_size);
nf_ct_free_hashtable(net->ct.nat_bysource, net->ct.nat_htable_size);
}
static struct pernet_operations nf_nat_net_ops = {
@ -697,11 +793,8 @@ static struct nfq_ct_nat_hook nfq_ct_nat = {
static int __init nf_nat_init(void)
{
size_t i;
int ret;
need_ipv4_conntrack();
ret = nf_ct_extend_register(&nat_extend);
if (ret < 0) {
printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
@ -712,22 +805,11 @@ static int __init nf_nat_init(void)
if (ret < 0)
goto cleanup_extend;
/* Sew in builtin protocols. */
spin_lock_bh(&nf_nat_lock);
for (i = 0; i < MAX_IP_NAT_PROTO; i++)
RCU_INIT_POINTER(nf_nat_protos[i], &nf_nat_unknown_protocol);
RCU_INIT_POINTER(nf_nat_protos[IPPROTO_TCP], &nf_nat_protocol_tcp);
RCU_INIT_POINTER(nf_nat_protos[IPPROTO_UDP], &nf_nat_protocol_udp);
RCU_INIT_POINTER(nf_nat_protos[IPPROTO_ICMP], &nf_nat_protocol_icmp);
spin_unlock_bh(&nf_nat_lock);
nf_ct_helper_expectfn_register(&follow_master_nat);
/* Initialize fake conntrack so that NAT will skip it */
nf_ct_untracked_status_or(IPS_NAT_DONE_MASK);
l3proto = nf_ct_l3proto_find_get((u_int16_t)AF_INET);
nf_ct_helper_expectfn_register(&follow_master_nat);
BUG_ON(nf_nat_seq_adjust_hook != NULL);
RCU_INIT_POINTER(nf_nat_seq_adjust_hook, nf_nat_seq_adjust);
BUG_ON(nfnetlink_parse_nat_setup_hook != NULL);
@ -736,6 +818,10 @@ static int __init nf_nat_init(void)
BUG_ON(nf_ct_nat_offset != NULL);
RCU_INIT_POINTER(nf_ct_nat_offset, nf_nat_get_offset);
RCU_INIT_POINTER(nfq_ct_nat_hook, &nfq_ct_nat);
#ifdef CONFIG_XFRM
BUG_ON(nf_nat_decode_session_hook != NULL);
RCU_INIT_POINTER(nf_nat_decode_session_hook, __nf_nat_decode_session);
#endif
return 0;
cleanup_extend:
@ -745,19 +831,24 @@ static int __init nf_nat_init(void)
static void __exit nf_nat_cleanup(void)
{
unsigned int i;
unregister_pernet_subsys(&nf_nat_net_ops);
nf_ct_l3proto_put(l3proto);
nf_ct_extend_unregister(&nat_extend);
nf_ct_helper_expectfn_unregister(&follow_master_nat);
RCU_INIT_POINTER(nf_nat_seq_adjust_hook, NULL);
RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, NULL);
RCU_INIT_POINTER(nf_ct_nat_offset, NULL);
RCU_INIT_POINTER(nfq_ct_nat_hook, NULL);
#ifdef CONFIG_XFRM
RCU_INIT_POINTER(nf_nat_decode_session_hook, NULL);
#endif
for (i = 0; i < NFPROTO_NUMPROTO; i++)
kfree(nf_nat_l4protos[i]);
synchronize_net();
}
MODULE_LICENSE("GPL");
MODULE_ALIAS("nf-nat-ipv4");
module_init(nf_nat_init);
module_exit(nf_nat_cleanup);

100
net/ipv4/netfilter/nf_nat_helper.c → net/netfilter/nf_nat_helper.c
View File

@ -1,4 +1,4 @@
/* ip_nat_helper.c - generic support functions for NAT helpers
/* nf_nat_helper.c - generic support functions for NAT helpers
*
* (C) 2000-2002 Harald Welte <laforge@netfilter.org>
* (C) 2003-2006 Netfilter Core Team <coreteam@netfilter.org>
@ -9,23 +9,19 @@
*/
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/kmod.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <net/checksum.h>
#include <net/tcp.h>
#include <net/route.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_helper.h>
@ -90,7 +86,6 @@ s16 nf_nat_get_offset(const struct nf_conn *ct,
return offset;
}
EXPORT_SYMBOL_GPL(nf_nat_get_offset);
/* Frobs data inside this packet, which is linear. */
static void mangle_contents(struct sk_buff *skb,
@ -125,9 +120,13 @@ static void mangle_contents(struct sk_buff *skb,
__skb_trim(skb, skb->len + rep_len - match_len);
}
/* fix IP hdr checksum information */
ip_hdr(skb)->tot_len = htons(skb->len);
ip_send_check(ip_hdr(skb));
if (nf_ct_l3num((struct nf_conn *)skb->nfct) == NFPROTO_IPV4) {
/* fix IP hdr checksum information */
ip_hdr(skb)->tot_len = htons(skb->len);
ip_send_check(ip_hdr(skb));
} else
ipv6_hdr(skb)->payload_len =
htons(skb->len - sizeof(struct ipv6hdr));
}
/* Unusual, but possible case. */
@ -166,35 +165,6 @@ void nf_nat_tcp_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
}
EXPORT_SYMBOL_GPL(nf_nat_tcp_seq_adjust);
static void nf_nat_csum(struct sk_buff *skb, const struct iphdr *iph, void *data,
int datalen, __sum16 *check, int oldlen)
{
struct rtable *rt = skb_rtable(skb);
if (skb->ip_summed != CHECKSUM_PARTIAL) {
if (!(rt->rt_flags & RTCF_LOCAL) &&
(!skb->dev || skb->dev->features & NETIF_F_V4_CSUM)) {
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_headroom(skb) +
skb_network_offset(skb) +
iph->ihl * 4;
skb->csum_offset = (void *)check - data;
*check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
datalen, iph->protocol, 0);
} else {
*check = 0;
*check = csum_tcpudp_magic(iph->saddr, iph->daddr,
datalen, iph->protocol,
csum_partial(data, datalen,
0));
if (iph->protocol == IPPROTO_UDP && !*check)
*check = CSUM_MANGLED_0;
}
} else
inet_proto_csum_replace2(check, skb,
htons(oldlen), htons(datalen), 1);
}
/* Generic function for mangling variable-length address changes inside
* NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
* command in FTP).
@ -212,7 +182,7 @@ int __nf_nat_mangle_tcp_packet(struct sk_buff *skb,
const char *rep_buffer,
unsigned int rep_len, bool adjust)
{
struct iphdr *iph;
const struct nf_nat_l3proto *l3proto;
struct tcphdr *tcph;
int oldlen, datalen;
@ -226,15 +196,17 @@ int __nf_nat_mangle_tcp_packet(struct sk_buff *skb,
SKB_LINEAR_ASSERT(skb);
iph = ip_hdr(skb);
tcph = (void *)iph + iph->ihl*4;
tcph = (void *)skb->data + protoff;
oldlen = skb->len - iph->ihl*4;
mangle_contents(skb, iph->ihl*4 + tcph->doff*4,
oldlen = skb->len - protoff;
mangle_contents(skb, protoff + tcph->doff*4,
match_offset, match_len, rep_buffer, rep_len);
datalen = skb->len - iph->ihl*4;
nf_nat_csum(skb, iph, tcph, datalen, &tcph->check, oldlen);
datalen = skb->len - protoff;
l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct));
l3proto->csum_recalc(skb, IPPROTO_TCP, tcph, &tcph->check,
datalen, oldlen);
if (adjust && rep_len != match_len)
nf_nat_set_seq_adjust(ct, ctinfo, tcph->seq,
@ -264,7 +236,7 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
const char *rep_buffer,
unsigned int rep_len)
{
struct iphdr *iph;
const struct nf_nat_l3proto *l3proto;
struct udphdr *udph;
int datalen, oldlen;
@ -276,22 +248,23 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb,
!enlarge_skb(skb, rep_len - match_len))
return 0;
iph = ip_hdr(skb);
udph = (void *)iph + iph->ihl*4;
udph = (void *)skb->data + protoff;
oldlen = skb->len - iph->ihl*4;
mangle_contents(skb, iph->ihl*4 + sizeof(*udph),
oldlen = skb->len - protoff;
mangle_contents(skb, protoff + sizeof(*udph),
match_offset, match_len, rep_buffer, rep_len);
/* update the length of the UDP packet */
datalen = skb->len - iph->ihl*4;
datalen = skb->len - protoff;
udph->len = htons(datalen);
/* fix udp checksum if udp checksum was previously calculated */
if (!udph->check && skb->ip_summed != CHECKSUM_PARTIAL)
return 1;
nf_nat_csum(skb, iph, udph, datalen, &udph->check, oldlen);
l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct));
l3proto->csum_recalc(skb, IPPROTO_UDP, udph, &udph->check,
datalen, oldlen);
return 1;
}
@ -343,6 +316,7 @@ sack_adjust(struct sk_buff *skb,
/* TCP SACK sequence number adjustment */
static inline unsigned int
nf_nat_sack_adjust(struct sk_buff *skb,
unsigned int protoff,
struct tcphdr *tcph,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
@ -350,8 +324,8 @@ nf_nat_sack_adjust(struct sk_buff *skb,
unsigned int dir, optoff, optend;
struct nf_conn_nat *nat = nfct_nat(ct);
optoff = ip_hdrlen(skb) + sizeof(struct tcphdr);
optend = ip_hdrlen(skb) + tcph->doff * 4;
optoff = protoff + sizeof(struct tcphdr);
optend = protoff + tcph->doff * 4;
if (!skb_make_writable(skb, optend))
return 0;
@ -432,7 +406,7 @@ nf_nat_seq_adjust(struct sk_buff *skb,
tcph->seq = newseq;
tcph->ack_seq = newack;
return nf_nat_sack_adjust(skb, tcph, ct, ctinfo);
return nf_nat_sack_adjust(skb, protoff, tcph, ct, ctinfo);
}
/* Setup NAT on this expected conntrack so it follows master. */
@ -440,22 +414,22 @@ nf_nat_seq_adjust(struct sk_buff *skb,
void nf_nat_follow_master(struct nf_conn *ct,
struct nf_conntrack_expect *exp)
{
struct nf_nat_ipv4_range range;
struct nf_nat_range range;
/* This must be a fresh one. */
BUG_ON(ct->status & IPS_NAT_DONE_MASK);
/* Change src to where master sends to */
range.flags = NF_NAT_RANGE_MAP_IPS;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.dst.u3.ip;
range.min_addr = range.max_addr
= ct->master->tuplehash[!exp->dir].tuple.dst.u3;
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
/* For DST manip, map port here to where it's expected. */
range.flags = (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED);
range.min = range.max = exp->saved_proto;
range.min_ip = range.max_ip
= ct->master->tuplehash[!exp->dir].tuple.src.u3.ip;
range.min_proto = range.max_proto = exp->saved_proto;
range.min_addr = range.max_addr
= ct->master->tuplehash[!exp->dir].tuple.src.u3;
nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
}
EXPORT_SYMBOL(nf_nat_follow_master);

54
net/ipv4/netfilter/nf_nat_proto_common.c → net/netfilter/nf_nat_proto_common.c
View File

@ -9,20 +9,18 @@
#include <linux/types.h>
#include <linux/random.h>
#include <linux/ip.h>
#include <linux/netfilter.h>
#include <linux/export.h>
#include <net/secure_seq.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
bool nf_nat_proto_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)
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;
@ -34,13 +32,14 @@ bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple,
return ntohs(port) >= ntohs(min->all) &&
ntohs(port) <= ntohs(max->all);
}
EXPORT_SYMBOL_GPL(nf_nat_proto_in_range);
EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct,
u_int16_t *rover)
void nf_nat_l4proto_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,
u16 *rover)
{
unsigned int range_size, min, i;
__be16 *portptr;
@ -71,15 +70,14 @@ void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
range_size = 65535 - 1024 + 1;
}
} else {
min = ntohs(range->min.all);
range_size = ntohs(range->max.all) - min + 1;
min = ntohs(range->min_proto.all);
range_size = ntohs(range->max_proto.all) - min + 1;
}
if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
off = secure_ipv4_port_ephemeral(tuple->src.u3.ip, tuple->dst.u3.ip,
maniptype == NF_NAT_MANIP_SRC
? tuple->dst.u.all
: tuple->src.u.all);
off = l3proto->secure_port(tuple, maniptype == NF_NAT_MANIP_SRC
? tuple->dst.u.all
: tuple->src.u.all);
else
off = *rover;
@ -93,22 +91,22 @@ void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
}
return;
}
EXPORT_SYMBOL_GPL(nf_nat_proto_unique_tuple);
EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_ipv4_range *range)
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
struct nf_nat_range *range)
{
if (tb[CTA_PROTONAT_PORT_MIN]) {
range->min.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
range->max.all = range->min.tcp.port;
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.all = nla_get_be16(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;
}
EXPORT_SYMBOL_GPL(nf_nat_proto_nlattr_to_range);
EXPORT_SYMBOL_GPL(nf_nat_l4proto_nlattr_to_range);
#endif

56
net/ipv4/netfilter/nf_nat_proto_dccp.c → net/netfilter/nf_nat_proto_dccp.c
View File

@ -1,7 +1,7 @@
/*
* DCCP NAT protocol helper
*
* Copyright (c) 2005, 2006. 2008 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2005, 2006, 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
@ -13,35 +13,34 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/dccp.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
static u_int16_t dccp_port_rover;
static void
dccp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
dccp_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)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&dccp_port_rover);
nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
&dccp_port_rover);
}
static bool
dccp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (const void *)(skb->data + iphdroff);
struct dccp_hdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl * 4;
__be32 oldip, newip;
__be16 *portptr, oldport, newport;
int hdrsize = 8; /* DCCP connection tracking guarantees this much */
@ -51,17 +50,12 @@ dccp_manip_pkt(struct sk_buff *skb,
if (!skb_make_writable(skb, hdroff + hdrsize))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct dccp_hdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
oldip = iph->saddr;
newip = tuple->src.u3.ip;
newport = tuple->src.u.dccp.port;
portptr = &hdr->dccph_sport;
} else {
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
newport = tuple->dst.u.dccp.port;
portptr = &hdr->dccph_dport;
}
@ -72,30 +66,46 @@ dccp_manip_pkt(struct sk_buff *skb,
if (hdrsize < sizeof(*hdr))
return true;
inet_proto_csum_replace4(&hdr->dccph_checksum, skb, oldip, newip, 1);
l3proto->csum_update(skb, iphdroff, &hdr->dccph_checksum,
tuple, maniptype);
inet_proto_csum_replace2(&hdr->dccph_checksum, skb, oldport, newport,
0);
return true;
}
static const struct nf_nat_protocol nf_nat_protocol_dccp = {
.protonum = IPPROTO_DCCP,
static const struct nf_nat_l4proto nf_nat_l4proto_dccp = {
.l4proto = IPPROTO_DCCP,
.manip_pkt = dccp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = dccp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_dccp_init(void)
{
return nf_nat_protocol_register(&nf_nat_protocol_dccp);
int err;
err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
if (err < 0)
goto err1;
err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_dccp);
if (err < 0)
goto err2;
return 0;
err2:
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
err1:
return err;
}
static void __exit nf_nat_proto_dccp_fini(void)
{
nf_nat_protocol_unregister(&nf_nat_protocol_dccp);
nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_dccp);
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_dccp);
}
module_init(nf_nat_proto_dccp_init);

53
net/ipv4/netfilter/nf_nat_proto_sctp.c → net/netfilter/nf_nat_proto_sctp.c
View File

@ -8,53 +8,46 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/sctp.h>
#include <linux/module.h>
#include <net/sctp/checksum.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l4proto.h>
static u_int16_t nf_sctp_port_rover;
static void
sctp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
sctp_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)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&nf_sctp_port_rover);
nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
&nf_sctp_port_rover);
}
static bool
sctp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
struct sk_buff *frag;
sctp_sctphdr_t *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
__be32 oldip, newip;
__be32 crc32;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct sctphdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
/* Get rid of src ip and src pt */
oldip = iph->saddr;
newip = tuple->src.u3.ip;
/* Get rid of src port */
hdr->source = tuple->src.u.sctp.port;
} else {
/* Get rid of dst ip and dst pt */
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
/* Get rid of dst port */
hdr->dest = tuple->dst.u.sctp.port;
}
@ -68,24 +61,38 @@ sctp_manip_pkt(struct sk_buff *skb,
return true;
}
static const struct nf_nat_protocol nf_nat_protocol_sctp = {
.protonum = IPPROTO_SCTP,
static const struct nf_nat_l4proto nf_nat_l4proto_sctp = {
.l4proto = IPPROTO_SCTP,
.manip_pkt = sctp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = sctp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_sctp_init(void)
{
return nf_nat_protocol_register(&nf_nat_protocol_sctp);
int err;
err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
if (err < 0)
goto err1;
err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
if (err < 0)
goto err2;
return 0;
err2:
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
err1:
return err;
}
static void __exit nf_nat_proto_sctp_exit(void)
{
nf_nat_protocol_unregister(&nf_nat_protocol_sctp);
nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
}
module_init(nf_nat_proto_sctp_init);

40
net/ipv4/netfilter/nf_nat_proto_tcp.c → net/netfilter/nf_nat_proto_tcp.c
View File

@ -9,37 +9,36 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
#include <net/netfilter/nf_nat_core.h>
static u_int16_t tcp_port_rover;
static u16 tcp_port_rover;
static void
tcp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
tcp_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)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, &tcp_port_rover);
nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
&tcp_port_rover);
}
static bool
tcp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
struct tcphdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
__be32 oldip, newip;
__be16 *portptr, newport, oldport;
int hdrsize = 8; /* TCP connection tracking guarantees this much */
@ -52,19 +51,14 @@ tcp_manip_pkt(struct sk_buff *skb,
if (!skb_make_writable(skb, hdroff + hdrsize))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct tcphdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
/* Get rid of src ip and src pt */
oldip = iph->saddr;
newip = tuple->src.u3.ip;
/* Get rid of src port */
newport = tuple->src.u.tcp.port;
portptr = &hdr->source;
} else {
/* Get rid of dst ip and dst pt */
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
/* Get rid of dst port */
newport = tuple->dst.u.tcp.port;
portptr = &hdr->dest;
}
@ -75,17 +69,17 @@ tcp_manip_pkt(struct sk_buff *skb,
if (hdrsize < sizeof(*hdr))
return true;
inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
l3proto->csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
inet_proto_csum_replace2(&hdr->check, skb, oldport, newport, 0);
return true;
}
const struct nf_nat_protocol nf_nat_protocol_tcp = {
.protonum = IPPROTO_TCP,
const struct nf_nat_l4proto nf_nat_l4proto_tcp = {
.l4proto = IPPROTO_TCP,
.manip_pkt = tcp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = tcp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};

42
net/ipv4/netfilter/nf_nat_proto_udp.c → net/netfilter/nf_nat_proto_udp.c
View File

@ -9,59 +9,53 @@
#include <linux/types.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
static u_int16_t udp_port_rover;
static u16 udp_port_rover;
static void
udp_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
udp_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)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct, &udp_port_rover);
nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
&udp_port_rover);
}
static bool
udp_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
struct udphdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
__be32 oldip, newip;
__be16 *portptr, newport;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct udphdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
/* Get rid of src ip and src pt */
oldip = iph->saddr;
newip = tuple->src.u3.ip;
/* Get rid of src port */
newport = tuple->src.u.udp.port;
portptr = &hdr->source;
} else {
/* Get rid of dst ip and dst pt */
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
/* Get rid of dst port */
newport = tuple->dst.u.udp.port;
portptr = &hdr->dest;
}
if (hdr->check || skb->ip_summed == CHECKSUM_PARTIAL) {
inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
l3proto->csum_update(skb, iphdroff, &hdr->check,
tuple, maniptype);
inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport,
0);
if (!hdr->check)
@ -71,12 +65,12 @@ udp_manip_pkt(struct sk_buff *skb,
return true;
}
const struct nf_nat_protocol nf_nat_protocol_udp = {
.protonum = IPPROTO_UDP,
const struct nf_nat_l4proto nf_nat_l4proto_udp = {
.l4proto = IPPROTO_UDP,
.manip_pkt = udp_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = udp_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};

58
net/ipv4/netfilter/nf_nat_proto_udplite.c → net/netfilter/nf_nat_proto_udplite.c
View File

@ -9,59 +9,53 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>
static u_int16_t udplite_port_rover;
static u16 udplite_port_rover;
static void
udplite_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
udplite_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)
{
nf_nat_proto_unique_tuple(tuple, range, maniptype, ct,
&udplite_port_rover);
nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
&udplite_port_rover);
}
static bool
udplite_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
const struct iphdr *iph = (struct iphdr *)(skb->data + iphdroff);
struct udphdr *hdr;
unsigned int hdroff = iphdroff + iph->ihl*4;
__be32 oldip, newip;
__be16 *portptr, newport;
if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
return false;
iph = (struct iphdr *)(skb->data + iphdroff);
hdr = (struct udphdr *)(skb->data + hdroff);
if (maniptype == NF_NAT_MANIP_SRC) {
/* Get rid of src ip and src pt */
oldip = iph->saddr;
newip = tuple->src.u3.ip;
/* Get rid of source port */
newport = tuple->src.u.udp.port;
portptr = &hdr->source;
} else {
/* Get rid of dst ip and dst pt */
oldip = iph->daddr;
newip = tuple->dst.u3.ip;
/* Get rid of dst port */
newport = tuple->dst.u.udp.port;
portptr = &hdr->dest;
}
inet_proto_csum_replace4(&hdr->check, skb, oldip, newip, 1);
l3proto->csum_update(skb, iphdroff, &hdr->check, tuple, maniptype);
inet_proto_csum_replace2(&hdr->check, skb, *portptr, newport, 0);
if (!hdr->check)
hdr->check = CSUM_MANGLED_0;
@ -70,24 +64,38 @@ udplite_manip_pkt(struct sk_buff *skb,
return true;
}
static const struct nf_nat_protocol nf_nat_protocol_udplite = {
.protonum = IPPROTO_UDPLITE,
static const struct nf_nat_l4proto nf_nat_l4proto_udplite = {
.l4proto = IPPROTO_UDPLITE,
.manip_pkt = udplite_manip_pkt,
.in_range = nf_nat_proto_in_range,
.in_range = nf_nat_l4proto_in_range,
.unique_tuple = udplite_unique_tuple,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.nlattr_to_range = nf_nat_proto_nlattr_to_range,
.nlattr_to_range = nf_nat_l4proto_nlattr_to_range,
#endif
};
static int __init nf_nat_proto_udplite_init(void)
{
return nf_nat_protocol_register(&nf_nat_protocol_udplite);
int err;
err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
if (err < 0)
goto err1;
err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_udplite);
if (err < 0)
goto err2;
return 0;
err2:
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
err1:
return err;
}
static void __exit nf_nat_proto_udplite_fini(void)
{
nf_nat_protocol_unregister(&nf_nat_protocol_udplite);
nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_udplite);
nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_udplite);
}
module_init(nf_nat_proto_udplite_init);

16
net/ipv4/netfilter/nf_nat_proto_unknown.c → net/netfilter/nf_nat_proto_unknown.c
View File

@ -15,8 +15,7 @@
#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_rule.h>
#include <net/netfilter/nf_nat_protocol.h>
#include <net/netfilter/nf_nat_l4proto.h>
static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type manip_type,
@ -26,26 +25,29 @@ static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
return true;
}
static void unknown_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_nat_ipv4_range *range,
static void unknown_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)
{
/* Sorry: we can't help you; if it's not unique, we can't frob
anything. */
* anything.
*/
return;
}
static bool
unknown_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l3proto *l3proto,
unsigned int iphdroff, unsigned int hdroff,
const struct nf_conntrack_tuple *tuple,
enum nf_nat_manip_type maniptype)
{
return true;
}
const struct nf_nat_protocol nf_nat_unknown_protocol = {
const struct nf_nat_l4proto nf_nat_l4proto_unknown = {
.manip_pkt = unknown_manip_pkt,
.in_range = unknown_in_range,
.unique_tuple = unknown_unique_tuple,

167
net/netfilter/xt_nat.c Normal file
View File

@ -0,0 +1,167 @@
/*
* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2011 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/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_nat_core.h>
static int xt_nat_checkentry_v0(const struct xt_tgchk_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
if (mr->rangesize != 1) {
pr_info("%s: multiple ranges no longer supported\n",
par->target->name);
return -EINVAL;
}
return 0;
}
static void xt_nat_convert_range(struct nf_nat_range *dst,
const struct nf_nat_ipv4_range *src)
{
memset(&dst->min_addr, 0, sizeof(dst->min_addr));
memset(&dst->max_addr, 0, sizeof(dst->max_addr));
dst->flags = src->flags;
dst->min_addr.ip = src->min_ip;
dst->max_addr.ip = src->max_ip;
dst->min_proto = src->min;
dst->max_proto = src->max;
}
static unsigned int
xt_snat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
struct nf_nat_range range;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
NF_CT_ASSERT(ct != NULL &&
(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
ctinfo == IP_CT_RELATED_REPLY));
xt_nat_convert_range(&range, &mr->range[0]);
return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_SRC);
}
static unsigned int
xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo;
struct nf_nat_range range;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
NF_CT_ASSERT(ct != NULL &&
(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
xt_nat_convert_range(&range, &mr->range[0]);
return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
}
static unsigned int
xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct nf_nat_range *range = par->targinfo;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
NF_CT_ASSERT(ct != NULL &&
(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
ctinfo == IP_CT_RELATED_REPLY));
return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC);
}
static unsigned int
xt_dnat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct nf_nat_range *range = par->targinfo;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
NF_CT_ASSERT(ct != NULL &&
(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED));
return nf_nat_setup_info(ct, range, NF_NAT_MANIP_DST);
}
static struct xt_target xt_nat_target_reg[] __read_mostly = {
{
.name = "SNAT",
.revision = 0,
.checkentry = xt_nat_checkentry_v0,
.target = xt_snat_target_v0,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.family = NFPROTO_IPV4,
.table = "nat",
.hooks = (1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT),
.me = THIS_MODULE,
},
{
.name = "DNAT",
.revision = 0,
.checkentry = xt_nat_checkentry_v0,
.target = xt_dnat_target_v0,
.targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat),
.family = NFPROTO_IPV4,
.table = "nat",
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN),
.me = THIS_MODULE,
},
{
.name = "SNAT",
.revision = 1,
.target = xt_snat_target_v1,
.targetsize = sizeof(struct nf_nat_range),
.table = "nat",
.hooks = (1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_OUT),
.me = THIS_MODULE,
},
{
.name = "DNAT",
.revision = 1,
.target = xt_dnat_target_v1,
.targetsize = sizeof(struct nf_nat_range),
.table = "nat",
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN),
.me = THIS_MODULE,
},
};
static int __init xt_nat_init(void)
{
return xt_register_targets(xt_nat_target_reg,
ARRAY_SIZE(xt_nat_target_reg));
}
static void __exit xt_nat_exit(void)
{
xt_unregister_targets(xt_nat_target_reg, ARRAY_SIZE(xt_nat_target_reg));
}
module_init(xt_nat_init);
module_exit(xt_nat_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_SNAT");
MODULE_ALIAS("ipt_DNAT");