This is a patch proposal to support shifted ranges in portmaps.
(i.e.
tcp/udp
incoming
port
5000-5100
on WAN
redirected
to LAN
192.168.1.5:2000-2100)
Currently DNAT only works for single port or identical port ranges.
(i.e.
ports
5000-5100
on WAN
interface
redirected
to a LAN
host while
original destination port is not altered)
When
different
port
ranges are
configured,
either
'random'
mode
should be
used, or
else all
incoming
connections
are mapped
onto the
first port
in the
redirect
range. (in
described
example
WAN:5000-5100
will all
be
mapped to 192.168.1.5:2000)
This patch
introduces
a new mode
indicated
by flag
NF_NAT_RANGE_PROTO_OFFSET
which uses
a base
port value
to
calculate
an offset
with the
destination
port
present in
the
incoming
stream.
That
offset is
then
applied as
index
within the
redirect
port range
(index
modulo rangewidth to handle range overflow).
In
described
example
the base
port would
be 5000.
An
incoming
stream
with
destination
port 5004
would
result in
an offset
value 4
which
means
that the NAT'ed stream will be using destination port 2004.
Other
possibilities
include
deterministic
mapping of
larger or
multiple
ranges to
a smaller
range :
WAN:5000-5999
->
LAN:5000-5099
(maps WAN
port 5*xx to port 51xx)
This patch
does not
change any
current
behavior.
It just
adds new
NAT proto
range
functionality
which must
be
selected
via the
specific
flag
when intended to use.
A patch
for
iptables
(libipt_DNAT.c)
will also
be
proposed
which
makes
this functionality immediately available.
Signed-off-by: Thierry Du Tre
<thierry@xxxxxxxxxxxx>
---
Changes in v2:
- added new revision for SNAT and DNAT targets to support the new base port variable in struct nf_nat_range2
- replaced all occurences of struct nf_nat_range with struct nf_nat_range2
include/net/netfilter/ipv4/nf_nat_masquerade.h | 2 +-
include/net/netfilter/ipv6/nf_nat_masquerade.h | 2 +-
include/net/netfilter/nf_nat.h | 2 +-
include/net/netfilter/nf_nat_l3proto.h | 4 +-
include/net/netfilter/nf_nat_l4proto.h | 8 +--
include/net/netfilter/nf_nat_redirect.h | 2 +-
include/uapi/linux/netfilter/nf_nat.h | 12 ++++-
net/ipv4/netfilter/ipt_MASQUERADE.c | 2 +-
net/ipv4/netfilter/nf_nat_h323.c | 4 +-
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 4 +-
net/ipv4/netfilter/nf_nat_masquerade_ipv4.c | 4 +-
net/ipv4/netfilter/nf_nat_pptp.c | 2 +-
net/ipv4/netfilter/nf_nat_proto_gre.c | 2 +-
net/ipv4/netfilter/nf_nat_proto_icmp.c | 2 +-
net/ipv4/netfilter/nft_masq_ipv4.c | 2 +-
net/ipv6/netfilter/ip6t_MASQUERADE.c | 2 +-
net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 4 +-
net/ipv6/netfilter/nf_nat_masquerade_ipv6.c | 4 +-
net/ipv6/netfilter/nf_nat_proto_icmpv6.c | 2 +-
net/ipv6/netfilter/nft_masq_ipv6.c | 2 +-
net/ipv6/netfilter/nft_redir_ipv6.c | 2 +-
net/netfilter/nf_nat_core.c | 27 +++++-----
net/netfilter/nf_nat_helper.c | 2 +-
net/netfilter/nf_nat_proto_common.c | 9 ++--
net/netfilter/nf_nat_proto_dccp.c | 2 +-
net/netfilter/nf_nat_proto_sctp.c | 2 +-
net/netfilter/nf_nat_proto_tcp.c | 2 +-
net/netfilter/nf_nat_proto_udp.c | 4 +-
net/netfilter/nf_nat_proto_unknown.c | 2 +-
net/netfilter/nf_nat_redirect.c | 6 +--
net/netfilter/nf_nat_sip.c | 2 +-
net/netfilter/nft_nat.c | 2 +-
net/netfilter/xt_NETMAP.c | 8 +--
net/netfilter/xt_REDIRECT.c | 2 +-
net/netfilter/xt_nat.c | 72 +++++++++++++++++++++++---
35 files changed, 143 insertions(+), 69 deletions(-)
diff --git a/include/net/netfilter/ipv4/nf_nat_masquerade.h b/include/net/netfilter/ipv4/nf_nat_masquerade.h
index ebd8694..cd24be4 100644
--- a/include/net/netfilter/ipv4/nf_nat_masquerade.h
+++ b/include/net/netfilter/ipv4/nf_nat_masquerade.h
@@ -6,7 +6,7 @@
unsigned int
nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
const struct net_device *out);
void nf_nat_masquerade_ipv4_register_notifier(void);
diff --git a/include/net/netfilter/ipv6/nf_nat_masquerade.h b/include/net/netfilter/ipv6/nf_nat_masquerade.h
index 1ed4f26..0c3b5eb 100644
--- a/include/net/netfilter/ipv6/nf_nat_masquerade.h
+++ b/include/net/netfilter/ipv6/nf_nat_masquerade.h
@@ -3,7 +3,7 @@
#define _NF_NAT_MASQUERADE_IPV6_H_
unsigned int
-nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
const struct net_device *out);
void nf_nat_masquerade_ipv6_register_notifier(void);
void nf_nat_masquerade_ipv6_unregister_notifier(void);
diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
index 207a467..da3d601 100644
--- a/include/net/netfilter/nf_nat.h
+++ b/include/net/netfilter/nf_nat.h
@@ -39,7 +39,7 @@ struct nf_conn_nat {
/* Set up the info structure to map into this range. */
unsigned int nf_nat_setup_info(struct nf_conn *ct,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype);
extern unsigned int nf_nat_alloc_null_binding(struct nf_conn *ct,
diff --git a/include/net/netfilter/nf_nat_l3proto.h b/include/net/netfilter/nf_nat_l3proto.h
index ce7c2b4..ac47098 100644
--- a/include/net/netfilter/nf_nat_l3proto.h
+++ b/include/net/netfilter/nf_nat_l3proto.h
@@ -7,7 +7,7 @@ struct nf_nat_l3proto {
u8 l3proto;
bool (*in_range)(const struct nf_conntrack_tuple *t,
- const struct nf_nat_range *range);
+ const struct nf_nat_range2 *range);
u32 (*secure_port)(const struct nf_conntrack_tuple *t, __be16);
@@ -33,7 +33,7 @@ struct nf_nat_l3proto {
struct flowi *fl);
int (*nlattr_to_range)(struct nlattr *tb[],
- struct nf_nat_range *range);
+ struct nf_nat_range2 *range);
};
int nf_nat_l3proto_register(const struct nf_nat_l3proto *);
diff --git a/include/net/netfilter/nf_nat_l4proto.h b/include/net/netfilter/nf_nat_l4proto.h
index 67835ff..b4d6b29 100644
--- a/include/net/netfilter/nf_nat_l4proto.h
+++ b/include/net/netfilter/nf_nat_l4proto.h
@@ -34,12 +34,12 @@ struct nf_nat_l4proto {
*/
void (*unique_tuple)(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct);
int (*nlattr_to_range)(struct nlattr *tb[],
- struct nf_nat_range *range);
+ struct nf_nat_range2 *range);
};
/* Protocol registration. */
@@ -72,11 +72,11 @@ bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct, u16 *rover);
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
- struct nf_nat_range *range);
+ struct nf_nat_range2 *range);
#endif /*_NF_NAT_L4PROTO_H*/
diff --git a/include/net/netfilter/nf_nat_redirect.h b/include/net/netfilter/nf_nat_redirect.h
index 5ddabb0..c129aac 100644
--- a/include/net/netfilter/nf_nat_redirect.h
+++ b/include/net/netfilter/nf_nat_redirect.h
@@ -7,7 +7,7 @@ nf_nat_redirect_ipv4(struct sk_buff *skb,
const struct nf_nat_ipv4_multi_range_compat *mr,
unsigned int hooknum);
unsigned int
-nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
unsigned int hooknum);
#endif /* _NF_NAT_REDIRECT_H_ */
diff --git a/include/uapi/linux/netfilter/nf_nat.h b/include/uapi/linux/netfilter/nf_nat.h
index a33000d..4a95c0d 100644
--- a/include/uapi/linux/netfilter/nf_nat.h
+++ b/include/uapi/linux/netfilter/nf_nat.h
@@ -10,6 +10,7 @@
#define NF_NAT_RANGE_PROTO_RANDOM (1 << 2)
#define NF_NAT_RANGE_PERSISTENT (1 << 3)
#define NF_NAT_RANGE_PROTO_RANDOM_FULLY (1 << 4)
+#define NF_NAT_RANGE_PROTO_OFFSET (1 << 5)
#define NF_NAT_RANGE_PROTO_RANDOM_ALL \
(NF_NAT_RANGE_PROTO_RANDOM | NF_NAT_RANGE_PROTO_RANDOM_FULLY)
@@ -17,7 +18,7 @@
#define NF_NAT_RANGE_MASK \
(NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED | \
NF_NAT_RANGE_PROTO_RANDOM | NF_NAT_RANGE_PERSISTENT | \
- NF_NAT_RANGE_PROTO_RANDOM_FULLY)
+ NF_NAT_RANGE_PROTO_RANDOM_FULLY | NF_NAT_RANGE_PROTO_OFFSET)
struct nf_nat_ipv4_range {
unsigned int flags;
@@ -40,4 +41,13 @@ struct nf_nat_range {
union nf_conntrack_man_proto max_proto;
};
+struct nf_nat_range2 {
+ 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;
+ union nf_conntrack_man_proto base_proto;
+};
+
#endif /* _NETFILTER_NF_NAT_H */
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
index a03e4e7..ce1512b 100644
--- a/net/ipv4/netfilter/ipt_MASQUERADE.c
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -47,7 +47,7 @@ static int masquerade_tg_check(const struct xt_tgchk_param *par)
static unsigned int
masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
const struct nf_nat_ipv4_multi_range_compat *mr;
mr = par->targinfo;
diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c
index ac8342d..4e6b53a 100644
--- a/net/ipv4/netfilter/nf_nat_h323.c
+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -395,7 +395,7 @@ 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_range range;
+ struct nf_nat_range2 range;
if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */
nf_nat_follow_master(new, this);
@@ -497,7 +497,7 @@ 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_range range;
+ struct nf_nat_range2 range;
/* This must be a fresh one. */
BUG_ON(new->status & IPS_NAT_DONE_MASK);
diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
index a0f37b2..724324e 100644
--- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
@@ -63,7 +63,7 @@ static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
#endif /* CONFIG_XFRM */
static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
- const struct nf_nat_range *range)
+ const struct nf_nat_range2 *range)
{
return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
@@ -143,7 +143,7 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
- struct nf_nat_range *range)
+ struct nf_nat_range2 *range)
{
if (tb[CTA_NAT_V4_MINIP]) {
range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]);
diff --git a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
index 0c366aa..f538c500 100644
--- a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
@@ -24,13 +24,13 @@
unsigned int
nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
const struct net_device *out)
{
struct nf_conn *ct;
struct nf_conn_nat *nat;
enum ip_conntrack_info ctinfo;
- struct nf_nat_range newrange;
+ struct nf_nat_range2 newrange;
const struct rtable *rt;
__be32 newsrc, nh;
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index 8a69363..5d259a1 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -48,7 +48,7 @@ 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_range range;
+ struct nf_nat_range2 range;
struct nf_conn_nat *nat;
nat = nf_ct_nat_ext_add(ct);
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index edf0500..00fda63 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -41,7 +41,7 @@ MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
static void
gre_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/ipv4/netfilter/nf_nat_proto_icmp.c b/net/ipv4/netfilter/nf_nat_proto_icmp.c
index 7b98baa..6d7cf1d 100644
--- a/net/ipv4/netfilter/nf_nat_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_nat_proto_icmp.c
@@ -30,7 +30,7 @@ icmp_in_range(const struct nf_conntrack_tuple *tuple,
static void
icmp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/ipv4/netfilter/nft_masq_ipv4.c b/net/ipv4/netfilter/nft_masq_ipv4.c
index f186772..f1193e1 100644
--- a/net/ipv4/netfilter/nft_masq_ipv4.c
+++ b/net/ipv4/netfilter/nft_masq_ipv4.c
@@ -21,7 +21,7 @@ static void nft_masq_ipv4_eval(const struct nft_expr *expr,
const struct nft_pktinfo *pkt)
{
struct nft_masq *priv = nft_expr_priv(expr);
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
memset(&range, 0, sizeof(range));
range.flags = priv->flags;
diff --git a/net/ipv6/netfilter/ip6t_MASQUERADE.c b/net/ipv6/netfilter/ip6t_MASQUERADE.c
index 2b1a158..2916df3 100644
--- a/net/ipv6/netfilter/ip6t_MASQUERADE.c
+++ b/net/ipv6/netfilter/ip6t_MASQUERADE.c
@@ -29,7 +29,7 @@ masquerade_tg6(struct sk_buff *skb, const struct xt_action_param *par)
static int masquerade_tg6_checkentry(const struct xt_tgchk_param *par)
{
- const struct nf_nat_range *range = par->targinfo;
+ const struct nf_nat_range2 *range = par->targinfo;
if (range->flags & NF_NAT_RANGE_MAP_IPS)
return -EINVAL;
diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
index 46d6dba..ece8043 100644
--- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
@@ -62,7 +62,7 @@ static void nf_nat_ipv6_decode_session(struct sk_buff *skb,
#endif
static bool nf_nat_ipv6_in_range(const struct nf_conntrack_tuple *t,
- const struct nf_nat_range *range)
+ const struct nf_nat_range2 *range)
{
return ipv6_addr_cmp(&t->src.u3.in6, &range->min_addr.in6) >= 0 &&
ipv6_addr_cmp(&t->src.u3.in6, &range->max_addr.in6) <= 0;
@@ -147,7 +147,7 @@ static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[],
- struct nf_nat_range *range)
+ struct nf_nat_range2 *range)
{
if (tb[CTA_NAT_V6_MINIP]) {
nla_memcpy(&range->min_addr.ip6, tb[CTA_NAT_V6_MINIP],
diff --git a/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c b/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
index 98f61fc..9dfc2b9 100644
--- a/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
+++ b/net/ipv6/netfilter/nf_nat_masquerade_ipv6.c
@@ -26,14 +26,14 @@
static atomic_t v6_worker_count;
unsigned int
-nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+nf_nat_masquerade_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
const struct net_device *out)
{
enum ip_conntrack_info ctinfo;
struct nf_conn_nat *nat;
struct in6_addr src;
struct nf_conn *ct;
- struct nf_nat_range newrange;
+ struct nf_nat_range2 newrange;
ct = nf_ct_get(skb, &ctinfo);
WARN_ON(!(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
diff --git a/net/ipv6/netfilter/nf_nat_proto_icmpv6.c b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
index 57593b00..d9bf42b 100644
--- a/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_nat_proto_icmpv6.c
@@ -32,7 +32,7 @@ icmpv6_in_range(const struct nf_conntrack_tuple *tuple,
static void
icmpv6_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/ipv6/netfilter/nft_masq_ipv6.c b/net/ipv6/netfilter/nft_masq_ipv6.c
index 4146536..dd0122f 100644
--- a/net/ipv6/netfilter/nft_masq_ipv6.c
+++ b/net/ipv6/netfilter/nft_masq_ipv6.c
@@ -22,7 +22,7 @@ static void nft_masq_ipv6_eval(const struct nft_expr *expr,
const struct nft_pktinfo *pkt)
{
struct nft_masq *priv = nft_expr_priv(expr);
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
memset(&range, 0, sizeof(range));
range.flags = priv->flags;
diff --git a/net/ipv6/netfilter/nft_redir_ipv6.c b/net/ipv6/netfilter/nft_redir_ipv6.c
index a27e424..7426986 100644
--- a/net/ipv6/netfilter/nft_redir_ipv6.c
+++ b/net/ipv6/netfilter/nft_redir_ipv6.c
@@ -22,7 +22,7 @@ static void nft_redir_ipv6_eval(const struct nft_expr *expr,
const struct nft_pktinfo *pkt)
{
struct nft_redir *priv = nft_expr_priv(expr);
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
memset(&range, 0, sizeof(range));
if (priv->sreg_proto_min) {
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index af8345f..b49a88f 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -155,7 +155,7 @@ EXPORT_SYMBOL(nf_nat_used_tuple);
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_range2 *range)
{
/* 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.
@@ -192,7 +192,7 @@ find_appropriate_src(struct net *net,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *result,
- const struct nf_nat_range *range)
+ const struct nf_nat_range2 *range)
{
unsigned int h = hash_by_src(net, tuple);
const struct nf_conn *ct;
@@ -222,7 +222,7 @@ find_appropriate_src(struct net *net,
static void
find_best_ips_proto(const struct nf_conntrack_zone *zone,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
const struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
@@ -296,7 +296,7 @@ find_best_ips_proto(const struct nf_conntrack_zone *zone,
static void
get_unique_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig_tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
struct nf_conn *ct,
enum nf_nat_manip_type maniptype)
{
@@ -347,9 +347,10 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
/* Only bother mapping if it's not already in range and unique */
if (!(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL)) {
if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
- if (l4proto->in_range(tuple, maniptype,
- &range->min_proto,
- &range->max_proto) &&
+ if (!(range->flags & NF_NAT_RANGE_PROTO_OFFSET) &&
+ 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;
@@ -358,7 +359,7 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
}
}
- /* Last change: get protocol to try to obtain unique tuple. */
+ /* Last chance: get protocol to try to obtain unique tuple. */
l4proto->unique_tuple(l3proto, tuple, range, maniptype, ct);
out:
rcu_read_unlock();
@@ -379,7 +380,7 @@ EXPORT_SYMBOL_GPL(nf_ct_nat_ext_add);
unsigned int
nf_nat_setup_info(struct nf_conn *ct,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype)
{
struct net *net = nf_ct_net(ct);
@@ -457,7 +458,7 @@ __nf_nat_alloc_null_binding(struct nf_conn *ct, enum nf_nat_manip_type manip)
(manip == NF_NAT_MANIP_SRC ?
ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3 :
ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3);
- struct nf_nat_range range = {
+ struct nf_nat_range2 range = {
.flags = NF_NAT_RANGE_MAP_IPS,
.min_addr = ip,
.max_addr = ip,
@@ -703,7 +704,7 @@ 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_range *range)
+ struct nf_nat_range2 *range)
{
struct nlattr *tb[CTA_PROTONAT_MAX+1];
const struct nf_nat_l4proto *l4proto;
@@ -731,7 +732,7 @@ static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
static int
nfnetlink_parse_nat(const struct nlattr *nat,
- const struct nf_conn *ct, struct nf_nat_range *range,
+ const struct nf_conn *ct, struct nf_nat_range2 *range,
const struct nf_nat_l3proto *l3proto)
{
struct nlattr *tb[CTA_NAT_MAX+1];
@@ -759,7 +760,7 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct,
enum nf_nat_manip_type manip,
const struct nlattr *attr)
{
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
const struct nf_nat_l3proto *l3proto;
int err;
diff --git a/net/netfilter/nf_nat_helper.c b/net/netfilter/nf_nat_helper.c
index 607a373..99606ba 100644
--- a/net/netfilter/nf_nat_helper.c
+++ b/net/netfilter/nf_nat_helper.c
@@ -191,7 +191,7 @@ EXPORT_SYMBOL(nf_nat_mangle_udp_packet);
void nf_nat_follow_master(struct nf_conn *ct,
struct nf_conntrack_expect *exp)
{
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
/* This must be a fresh one. */
BUG_ON(ct->status & IPS_NAT_DONE_MASK);
diff --git a/net/netfilter/nf_nat_proto_common.c b/net/netfilter/nf_nat_proto_common.c
index fbce552..432d3d4 100644
--- a/net/netfilter/nf_nat_proto_common.c
+++ b/net/netfilter/nf_nat_proto_common.c
@@ -36,7 +36,7 @@ EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct,
u16 *rover)
@@ -80,6 +80,8 @@ void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
: tuple->src.u.all);
} else if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) {
off = prandom_u32();
+ } else if (range->flags & NF_NAT_RANGE_PROTO_OFFSET) {
+ off = (ntohs(*portptr) - ntohs(range->base_proto.all));
} else {
off = *rover;
}
@@ -88,7 +90,8 @@ void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
*portptr = htons(min + off % range_size);
if (++i != range_size && nf_nat_used_tuple(tuple, ct))
continue;
- if (!(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL))
+ if (!(range->flags & (NF_NAT_RANGE_PROTO_RANDOM_ALL|
+ NF_NAT_RANGE_PROTO_OFFSET)))
*rover = off;
return;
}
@@ -97,7 +100,7 @@ EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
- struct nf_nat_range *range)
+ struct nf_nat_range2 *range)
{
if (tb[CTA_PROTONAT_PORT_MIN]) {
range->min_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
diff --git a/net/netfilter/nf_nat_proto_dccp.c b/net/netfilter/nf_nat_proto_dccp.c
index 269fcd5..67ea0d8 100644
--- a/net/netfilter/nf_nat_proto_dccp.c
+++ b/net/netfilter/nf_nat_proto_dccp.c
@@ -23,7 +23,7 @@ static u_int16_t dccp_port_rover;
static void
dccp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/netfilter/nf_nat_proto_sctp.c b/net/netfilter/nf_nat_proto_sctp.c
index c57ee32..1c5d9b6 100644
--- a/net/netfilter/nf_nat_proto_sctp.c
+++ b/net/netfilter/nf_nat_proto_sctp.c
@@ -17,7 +17,7 @@ static u_int16_t nf_sctp_port_rover;
static void
sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/netfilter/nf_nat_proto_tcp.c b/net/netfilter/nf_nat_proto_tcp.c
index 4f8820f..f15fcd4 100644
--- a/net/netfilter/nf_nat_proto_tcp.c
+++ b/net/netfilter/nf_nat_proto_tcp.c
@@ -23,7 +23,7 @@ static u16 tcp_port_rover;
static void
tcp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/netfilter/nf_nat_proto_udp.c b/net/netfilter/nf_nat_proto_udp.c
index edd4a77..5790f70 100644
--- a/net/netfilter/nf_nat_proto_udp.c
+++ b/net/netfilter/nf_nat_proto_udp.c
@@ -22,7 +22,7 @@ static u16 udp_port_rover;
static void
udp_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
@@ -100,7 +100,7 @@ static bool udplite_manip_pkt(struct sk_buff *skb,
static void
udplite_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/netfilter/nf_nat_proto_unknown.c b/net/netfilter/nf_nat_proto_unknown.c
index 6e494d5..c5db3e2 100644
--- a/net/netfilter/nf_nat_proto_unknown.c
+++ b/net/netfilter/nf_nat_proto_unknown.c
@@ -27,7 +27,7 @@ static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
static void unknown_unique_tuple(const struct nf_nat_l3proto *l3proto,
struct nf_conntrack_tuple *tuple,
- const struct nf_nat_range *range,
+ const struct nf_nat_range2 *range,
enum nf_nat_manip_type maniptype,
const struct nf_conn *ct)
{
diff --git a/net/netfilter/nf_nat_redirect.c b/net/netfilter/nf_nat_redirect.c
index 25b06b9..7c4bb0a 100644
--- a/net/netfilter/nf_nat_redirect.c
+++ b/net/netfilter/nf_nat_redirect.c
@@ -36,7 +36,7 @@ nf_nat_redirect_ipv4(struct sk_buff *skb,
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
__be32 newdst;
- struct nf_nat_range newrange;
+ struct nf_nat_range2 newrange;
WARN_ON(hooknum != NF_INET_PRE_ROUTING &&
hooknum != NF_INET_LOCAL_OUT);
@@ -82,10 +82,10 @@ EXPORT_SYMBOL_GPL(nf_nat_redirect_ipv4);
static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT;
unsigned int
-nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range *range,
+nf_nat_redirect_ipv6(struct sk_buff *skb, const struct nf_nat_range2 *range,
unsigned int hooknum)
{
- struct nf_nat_range newrange;
+ struct nf_nat_range2 newrange;
struct in6_addr newdst;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
diff --git a/net/netfilter/nf_nat_sip.c b/net/netfilter/nf_nat_sip.c
index 791fac4..1f30860 100644
--- a/net/netfilter/nf_nat_sip.c
+++ b/net/netfilter/nf_nat_sip.c
@@ -316,7 +316,7 @@ static void nf_nat_sip_seq_adjust(struct sk_buff *skb, unsigned int protoff,
static void nf_nat_sip_expected(struct nf_conn *ct,
struct nf_conntrack_expect *exp)
{
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
/* This must be a fresh one. */
BUG_ON(ct->status & IPS_NAT_DONE_MASK);
diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
index ed548d0..9d9aee6 100644
--- a/net/netfilter/nft_nat.c
+++ b/net/netfilter/nft_nat.c
@@ -43,7 +43,7 @@ static void nft_nat_eval(const struct nft_expr *expr,
const struct nft_nat *priv = nft_expr_priv(expr);
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
- struct nf_nat_range range;
+ struct nf_nat_range2 range;
memset(&range, 0, sizeof(range));
if (priv->sreg_addr_min) {
diff --git a/net/netfilter/xt_NETMAP.c b/net/netfilter/xt_NETMAP.c
index 58aa9dd..1d43787 100644
--- a/net/netfilter/xt_NETMAP.c
+++ b/net/netfilter/xt_NETMAP.c
@@ -21,8 +21,8 @@
static unsigned int
netmap_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
- const struct nf_nat_range *range = par->targinfo;
- struct nf_nat_range newrange;
+ const struct nf_nat_range2 *range = par->targinfo;
+ struct nf_nat_range2 newrange;
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
union nf_inet_addr new_addr, netmask;
@@ -56,7 +56,7 @@ netmap_tg6(struct sk_buff *skb, const struct xt_action_param *par)
static int netmap_tg6_checkentry(const struct xt_tgchk_param *par)
{
- const struct nf_nat_range *range = par->targinfo;
+ const struct nf_nat_range2 *range = par->targinfo;
if (!(range->flags & NF_NAT_RANGE_MAP_IPS))
return -EINVAL;
@@ -75,7 +75,7 @@ netmap_tg4(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_range newrange;
+ struct nf_nat_range2 newrange;
WARN_ON(xt_hooknum(par) != NF_INET_PRE_ROUTING &&
xt_hooknum(par) != NF_INET_POST_ROUTING &&
diff --git a/net/netfilter/xt_REDIRECT.c b/net/netfilter/xt_REDIRECT.c
index 98a4c6d..5ce9461 100644
--- a/net/netfilter/xt_REDIRECT.c
+++ b/net/netfilter/xt_REDIRECT.c
@@ -36,7 +36,7 @@ redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par)
static int redirect_tg6_checkentry(const struct xt_tgchk_param *par)
{
- const struct nf_nat_range *range = par->targinfo;
+ const struct nf_nat_range2 *range = par->targinfo;
if (range->flags & NF_NAT_RANGE_MAP_IPS)
return -EINVAL;
diff --git a/net/netfilter/xt_nat.c b/net/netfilter/xt_nat.c
index 0fd14d1..d3002b2 100644
--- a/net/netfilter/xt_nat.c
+++ b/net/netfilter/xt_nat.c
@@ -36,11 +36,12 @@ static void xt_nat_destroy(const struct xt_tgdtor_param *par)
nf_ct_netns_put(par->net, par->family);
}
-static void xt_nat_convert_range(struct nf_nat_range *dst,
+static void xt_nat_convert_range(struct nf_nat_range2 *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));
+ memset(&dst->base_proto, 0, sizeof(dst->base_proto));
dst->flags = src->flags;
dst->min_addr.ip = src->min_ip;
@@ -53,7 +54,7 @@ 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;
+ struct nf_nat_range2 range;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
@@ -70,7 +71,7 @@ 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;
+ struct nf_nat_range2 range;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
@@ -85,7 +86,8 @@ xt_dnat_target_v0(struct sk_buff *skb, const struct xt_action_param *par)
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;
+ const struct nf_nat_range *range_v1 = par->targinfo;
+ struct nf_nat_range2 range;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
@@ -94,13 +96,49 @@ xt_snat_target_v1(struct sk_buff *skb, const struct xt_action_param *par)
(ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED ||
ctinfo == IP_CT_RELATED_REPLY)));
- return nf_nat_setup_info(ct, range, NF_NAT_MANIP_SRC);
+ memcpy(&range, range_v1, sizeof(*range_v1));
+ memset(&range.base_proto, 0, sizeof(range.base_proto));
+
+ 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;
+ const struct nf_nat_range *range_v1 = par->targinfo;
+ struct nf_nat_range2 range;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ WARN_ON(!(ct != NULL &&
+ (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)));
+
+ memcpy(&range, range_v1, sizeof(*range_v1));
+ memset(&range.base_proto, 0, sizeof(range.base_proto));
+
+ return nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST);
+}
+
+static unsigned int
+xt_snat_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct nf_nat_range2 *range = par->targinfo;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ WARN_ON(!(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_v2(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct nf_nat_range2 *range = par->targinfo;
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
@@ -162,6 +200,28 @@ static struct xt_target xt_nat_target_reg[] __read_mostly = {
(1 << NF_INET_LOCAL_OUT),
.me = THIS_MODULE,
},
+ {
+ .name = "SNAT",
+ .revision = 2,
+ .checkentry = xt_nat_checkentry,
+ .destroy = xt_nat_destroy,
+ .target = xt_snat_target_v2,
+ .targetsize = sizeof(struct nf_nat_range2),
+ .table = "nat",
+ .hooks = (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "DNAT",
+ .revision = 2,
+ .target = xt_dnat_target_v2,
+ .targetsize = sizeof(struct nf_nat_range2),
+ .table = "nat",
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT),
+ .me = THIS_MODULE,
+ },
};
static int __init xt_nat_init(void)
--
2.7.4
--
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