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authorTomasz Bursztyka <tomasz.bursztyka@linux.intel.com>2013-10-10 07:39:19 -0400
committerPablo Neira Ayuso <pablo@netfilter.org>2013-10-14 12:00:58 -0400
commiteb31628e37a0a4e01fffd79dcc7f815d2357f53a (patch)
tree8f78d641ddc8817109b55cedb114e4a4a8d9c045
parent9ddf63235749a9efa1fad2eeb74be2ee9b580f8d (diff)
netfilter: nf_tables: Add support for IPv6 NAT
This patch generalizes the NAT expression to support both IPv4 and IPv6 using the existing IPv4/IPv6 NAT infrastructure. This also adds the NAT chain type for IPv6. This patch collapses the following patches that were posted to the netfilter-devel mailing list, from Tomasz: * nf_tables: Change NFTA_NAT_ attributes to better semantic significance * nf_tables: Split IPv4 NAT into NAT expression and IPv4 NAT chain * nf_tables: Add support for IPv6 NAT expression * nf_tables: Add support for IPv6 NAT chain * nf_tables: Fix up build issue on IPv6 NAT support And, from Pablo Neira Ayuso: * fix missing dependencies in nft_chain_nat Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat
-rw-r--r--include/uapi/linux/netfilter/nf_tables.h18
-rw-r--r--net/ipv4/netfilter/Kconfig1
-rw-r--r--net/ipv4/netfilter/nft_chain_nat_ipv4.c156
-rw-r--r--net/ipv6/netfilter/Kconfig5
-rw-r--r--net/ipv6/netfilter/Makefile1
-rw-r--r--net/ipv6/netfilter/nft_chain_nat_ipv6.c211
-rw-r--r--net/netfilter/Kconfig6
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/nft_nat.c220
9 files changed, 457 insertions, 162 deletions
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index a9c4bce1988f..7d4a1992f89c 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -695,18 +695,20 @@ enum nft_nat_types {
695 * enum nft_nat_attributes - nf_tables nat expression netlink attributes 695 * enum nft_nat_attributes - nf_tables nat expression netlink attributes
696 * 696 *
697 * @NFTA_NAT_TYPE: NAT type (NLA_U32: nft_nat_types) 697 * @NFTA_NAT_TYPE: NAT type (NLA_U32: nft_nat_types)
698 * @NFTA_NAT_ADDR_MIN: source register of address range start (NLA_U32: nft_registers) 698 * @NFTA_NAT_FAMILY: NAT family (NLA_U32)
699 * @NFTA_NAT_ADDR_MAX: source register of address range end (NLA_U32: nft_registers) 699 * @NFTA_NAT_REG_ADDR_MIN: source register of address range start (NLA_U32: nft_registers)
700 * @NFTA_NAT_PROTO_MIN: source register of proto range start (NLA_U32: nft_registers) 700 * @NFTA_NAT_REG_ADDR_MAX: source register of address range end (NLA_U32: nft_registers)
701 * @NFTA_NAT_PROTO_MAX: source register of proto range end (NLA_U32: nft_registers) 701 * @NFTA_NAT_REG_PROTO_MIN: source register of proto range start (NLA_U32: nft_registers)
702 * @NFTA_NAT_REG_PROTO_MAX: source register of proto range end (NLA_U32: nft_registers)
702 */ 703 */
703enum nft_nat_attributes { 704enum nft_nat_attributes {
704 NFTA_NAT_UNSPEC, 705 NFTA_NAT_UNSPEC,
705 NFTA_NAT_TYPE, 706 NFTA_NAT_TYPE,
706 NFTA_NAT_ADDR_MIN, 707 NFTA_NAT_FAMILY,
707 NFTA_NAT_ADDR_MAX, 708 NFTA_NAT_REG_ADDR_MIN,
708 NFTA_NAT_PROTO_MIN, 709 NFTA_NAT_REG_ADDR_MAX,
709 NFTA_NAT_PROTO_MAX, 710 NFTA_NAT_REG_PROTO_MIN,
711 NFTA_NAT_REG_PROTO_MAX,
710 __NFTA_NAT_MAX 712 __NFTA_NAT_MAX
711}; 713};
712#define NFTA_NAT_MAX (__NFTA_NAT_MAX - 1) 714#define NFTA_NAT_MAX (__NFTA_NAT_MAX - 1)
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index ae65fe98bfbe..1f37ef67f1ac 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -50,6 +50,7 @@ config NFT_CHAIN_ROUTE_IPV4
50 50
51config NFT_CHAIN_NAT_IPV4 51config NFT_CHAIN_NAT_IPV4
52 depends on NF_TABLES_IPV4 52 depends on NF_TABLES_IPV4
53 depends on NF_NAT_IPV4 && NFT_NAT
53 tristate "IPv4 nf_tables nat chain support" 54 tristate "IPv4 nf_tables nat chain support"
54 55
55config IP_NF_IPTABLES 56config IP_NF_IPTABLES
diff --git a/net/ipv4/netfilter/nft_chain_nat_ipv4.c b/net/ipv4/netfilter/nft_chain_nat_ipv4.c
index e09c201adf84..cf2c792cd971 100644
--- a/net/ipv4/netfilter/nft_chain_nat_ipv4.c
+++ b/net/ipv4/netfilter/nft_chain_nat_ipv4.c
@@ -1,6 +1,7 @@
1/* 1/*
2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> 2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org> 3 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
4 * Copyright (c) 2012 Intel Corporation
4 * 5 *
5 * This program is free software; you can redistribute it and/or modify 6 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as 7 * it under the terms of the GNU General Public License version 2 as
@@ -14,10 +15,8 @@
14#include <linux/list.h> 15#include <linux/list.h>
15#include <linux/skbuff.h> 16#include <linux/skbuff.h>
16#include <linux/ip.h> 17#include <linux/ip.h>
17#include <linux/netlink.h>
18#include <linux/netfilter.h> 18#include <linux/netfilter.h>
19#include <linux/netfilter_ipv4.h> 19#include <linux/netfilter_ipv4.h>
20#include <linux/netfilter/nfnetlink.h>
21#include <linux/netfilter/nf_tables.h> 20#include <linux/netfilter/nf_tables.h>
22#include <net/netfilter/nf_conntrack.h> 21#include <net/netfilter/nf_conntrack.h>
23#include <net/netfilter/nf_nat.h> 22#include <net/netfilter/nf_nat.h>
@@ -27,147 +26,6 @@
27#include <net/netfilter/nf_nat_l3proto.h> 26#include <net/netfilter/nf_nat_l3proto.h>
28#include <net/ip.h> 27#include <net/ip.h>
29 28
30struct nft_nat {
31 enum nft_registers sreg_addr_min:8;
32 enum nft_registers sreg_addr_max:8;
33 enum nft_registers sreg_proto_min:8;
34 enum nft_registers sreg_proto_max:8;
35 enum nf_nat_manip_type type;
36};
37
38static void nft_nat_eval(const struct nft_expr *expr,
39 struct nft_data data[NFT_REG_MAX + 1],
40 const struct nft_pktinfo *pkt)
41{
42 const struct nft_nat *priv = nft_expr_priv(expr);
43 enum ip_conntrack_info ctinfo;
44 struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
45 struct nf_nat_range range;
46
47 memset(&range, 0, sizeof(range));
48 if (priv->sreg_addr_min) {
49 range.min_addr.ip = data[priv->sreg_addr_min].data[0];
50 range.max_addr.ip = data[priv->sreg_addr_max].data[0];
51 range.flags |= NF_NAT_RANGE_MAP_IPS;
52 }
53
54 if (priv->sreg_proto_min) {
55 range.min_proto.all = data[priv->sreg_proto_min].data[0];
56 range.max_proto.all = data[priv->sreg_proto_max].data[0];
57 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
58 }
59
60 data[NFT_REG_VERDICT].verdict =
61 nf_nat_setup_info(ct, &range, priv->type);
62}
63
64static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
65 [NFTA_NAT_ADDR_MIN] = { .type = NLA_U32 },
66 [NFTA_NAT_ADDR_MAX] = { .type = NLA_U32 },
67 [NFTA_NAT_PROTO_MIN] = { .type = NLA_U32 },
68 [NFTA_NAT_PROTO_MAX] = { .type = NLA_U32 },
69 [NFTA_NAT_TYPE] = { .type = NLA_U32 },
70};
71
72static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
73 const struct nlattr * const tb[])
74{
75 struct nft_nat *priv = nft_expr_priv(expr);
76 int err;
77
78 if (tb[NFTA_NAT_TYPE] == NULL)
79 return -EINVAL;
80
81 switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
82 case NFT_NAT_SNAT:
83 priv->type = NF_NAT_MANIP_SRC;
84 break;
85 case NFT_NAT_DNAT:
86 priv->type = NF_NAT_MANIP_DST;
87 break;
88 default:
89 return -EINVAL;
90 }
91
92 if (tb[NFTA_NAT_ADDR_MIN]) {
93 priv->sreg_addr_min = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MIN]));
94 err = nft_validate_input_register(priv->sreg_addr_min);
95 if (err < 0)
96 return err;
97 }
98
99 if (tb[NFTA_NAT_ADDR_MAX]) {
100 priv->sreg_addr_max = ntohl(nla_get_be32(tb[NFTA_NAT_ADDR_MAX]));
101 err = nft_validate_input_register(priv->sreg_addr_max);
102 if (err < 0)
103 return err;
104 } else
105 priv->sreg_addr_max = priv->sreg_addr_min;
106
107 if (tb[NFTA_NAT_PROTO_MIN]) {
108 priv->sreg_proto_min = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MIN]));
109 err = nft_validate_input_register(priv->sreg_proto_min);
110 if (err < 0)
111 return err;
112 }
113
114 if (tb[NFTA_NAT_PROTO_MAX]) {
115 priv->sreg_proto_max = ntohl(nla_get_be32(tb[NFTA_NAT_PROTO_MAX]));
116 err = nft_validate_input_register(priv->sreg_proto_max);
117 if (err < 0)
118 return err;
119 } else
120 priv->sreg_proto_max = priv->sreg_proto_min;
121
122 return 0;
123}
124
125static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
126{
127 const struct nft_nat *priv = nft_expr_priv(expr);
128
129 switch (priv->type) {
130 case NF_NAT_MANIP_SRC:
131 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
132 goto nla_put_failure;
133 break;
134 case NF_NAT_MANIP_DST:
135 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
136 goto nla_put_failure;
137 break;
138 }
139
140 if (nla_put_be32(skb, NFTA_NAT_ADDR_MIN, htonl(priv->sreg_addr_min)))
141 goto nla_put_failure;
142 if (nla_put_be32(skb, NFTA_NAT_ADDR_MAX, htonl(priv->sreg_addr_max)))
143 goto nla_put_failure;
144 if (nla_put_be32(skb, NFTA_NAT_PROTO_MIN, htonl(priv->sreg_proto_min)))
145 goto nla_put_failure;
146 if (nla_put_be32(skb, NFTA_NAT_PROTO_MAX, htonl(priv->sreg_proto_max)))
147 goto nla_put_failure;
148 return 0;
149
150nla_put_failure:
151 return -1;
152}
153
154static struct nft_expr_type nft_nat_type;
155static const struct nft_expr_ops nft_nat_ops = {
156 .type = &nft_nat_type,
157 .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
158 .eval = nft_nat_eval,
159 .init = nft_nat_init,
160 .dump = nft_nat_dump,
161};
162
163static struct nft_expr_type nft_nat_type __read_mostly = {
164 .name = "nat",
165 .ops = &nft_nat_ops,
166 .policy = nft_nat_policy,
167 .maxattr = NFTA_NAT_MAX,
168 .owner = THIS_MODULE,
169};
170
171/* 29/*
172 * NAT chains 30 * NAT chains
173 */ 31 */
@@ -306,7 +164,7 @@ static unsigned int nf_nat_output(const struct nf_hook_ops *ops,
306 return ret; 164 return ret;
307} 165}
308 166
309struct nf_chain_type nft_chain_nat_ipv4 = { 167static struct nf_chain_type nft_chain_nat_ipv4 = {
310 .family = NFPROTO_IPV4, 168 .family = NFPROTO_IPV4,
311 .name = "nat", 169 .name = "nat",
312 .type = NFT_CHAIN_T_NAT, 170 .type = NFT_CHAIN_T_NAT,
@@ -331,20 +189,11 @@ static int __init nft_chain_nat_init(void)
331 if (err < 0) 189 if (err < 0)
332 return err; 190 return err;
333 191
334 err = nft_register_expr(&nft_nat_type);
335 if (err < 0)
336 goto err;
337
338 return 0; 192 return 0;
339
340err:
341 nft_unregister_chain_type(&nft_chain_nat_ipv4);
342 return err;
343} 193}
344 194
345static void __exit nft_chain_nat_exit(void) 195static void __exit nft_chain_nat_exit(void)
346{ 196{
347 nft_unregister_expr(&nft_nat_type);
348 nft_unregister_chain_type(&nft_chain_nat_ipv4); 197 nft_unregister_chain_type(&nft_chain_nat_ipv4);
349} 198}
350 199
@@ -354,4 +203,3 @@ module_exit(nft_chain_nat_exit);
354MODULE_LICENSE("GPL"); 203MODULE_LICENSE("GPL");
355MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 204MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
356MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat"); 205MODULE_ALIAS_NFT_CHAIN(AF_INET, "nat");
357MODULE_ALIAS_NFT_EXPR("nat");
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 23833064b7b5..7702f9e90a04 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -33,6 +33,11 @@ config NFT_CHAIN_ROUTE_IPV6
33 depends on NF_TABLES_IPV6 33 depends on NF_TABLES_IPV6
34 tristate "IPv6 nf_tables route chain support" 34 tristate "IPv6 nf_tables route chain support"
35 35
36config NFT_CHAIN_NAT_IPV6
37 depends on NF_TABLES_IPV6
38 depends on NF_NAT_IPV6 && NFT_NAT
39 tristate "IPv6 nf_tables nat chain support"
40
36config IP6_NF_IPTABLES 41config IP6_NF_IPTABLES
37 tristate "IP6 tables support (required for filtering)" 42 tristate "IP6 tables support (required for filtering)"
38 depends on INET && IPV6 43 depends on INET && IPV6
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index be4913aa524d..d1b4928f34f7 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
26# nf_tables 26# nf_tables
27obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o 27obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
28obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o 28obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
29obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
29 30
30# matches 31# matches
31obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o 32obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
diff --git a/net/ipv6/netfilter/nft_chain_nat_ipv6.c b/net/ipv6/netfilter/nft_chain_nat_ipv6.c
new file mode 100644
index 000000000000..e86dcd70dc76
--- /dev/null
+++ b/net/ipv6/netfilter/nft_chain_nat_ipv6.c
@@ -0,0 +1,211 @@
1/*
2 * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012 Intel Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/list.h>
14#include <linux/skbuff.h>
15#include <linux/ip.h>
16#include <linux/netfilter.h>
17#include <linux/netfilter_ipv6.h>
18#include <linux/netfilter/nf_tables.h>
19#include <net/netfilter/nf_conntrack.h>
20#include <net/netfilter/nf_nat.h>
21#include <net/netfilter/nf_nat_core.h>
22#include <net/netfilter/nf_tables.h>
23#include <net/netfilter/nf_tables_ipv6.h>
24#include <net/netfilter/nf_nat_l3proto.h>
25#include <net/ipv6.h>
26
27/*
28 * IPv6 NAT chains
29 */
30
31static unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
32 struct sk_buff *skb,
33 const struct net_device *in,
34 const struct net_device *out,
35 int (*okfn)(struct sk_buff *))
36{
37 enum ip_conntrack_info ctinfo;
38 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
39 struct nf_conn_nat *nat;
40 enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
41 __be16 frag_off;
42 int hdrlen;
43 u8 nexthdr;
44 struct nft_pktinfo pkt;
45 unsigned int ret;
46
47 if (ct == NULL || nf_ct_is_untracked(ct))
48 return NF_ACCEPT;
49
50 nat = nfct_nat(ct);
51 if (nat == NULL) {
52 /* Conntrack module was loaded late, can't add extension. */
53 if (nf_ct_is_confirmed(ct))
54 return NF_ACCEPT;
55 nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
56 if (nat == NULL)
57 return NF_ACCEPT;
58 }
59
60 switch (ctinfo) {
61 case IP_CT_RELATED:
62 case IP_CT_RELATED + IP_CT_IS_REPLY:
63 nexthdr = ipv6_hdr(skb)->nexthdr;
64 hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
65 &nexthdr, &frag_off);
66
67 if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
68 if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
69 ops->hooknum,
70 hdrlen))
71 return NF_DROP;
72 else
73 return NF_ACCEPT;
74 }
75 /* Fall through */
76 case IP_CT_NEW:
77 if (nf_nat_initialized(ct, maniptype))
78 break;
79
80 nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out);
81
82 ret = nft_do_chain_pktinfo(&pkt, ops);
83 if (ret != NF_ACCEPT)
84 return ret;
85 if (!nf_nat_initialized(ct, maniptype)) {
86 ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
87 if (ret != NF_ACCEPT)
88 return ret;
89 }
90 default:
91 break;
92 }
93
94 return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
95}
96
97static unsigned int nf_nat_ipv6_prerouting(const struct nf_hook_ops *ops,
98 struct sk_buff *skb,
99 const struct net_device *in,
100 const struct net_device *out,
101 int (*okfn)(struct sk_buff *))
102{
103 struct in6_addr daddr = ipv6_hdr(skb)->daddr;
104 unsigned int ret;
105
106 ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
107 if (ret != NF_DROP && ret != NF_STOLEN &&
108 ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
109 skb_dst_drop(skb);
110
111 return ret;
112}
113
114static unsigned int nf_nat_ipv6_postrouting(const struct nf_hook_ops *ops,
115 struct sk_buff *skb,
116 const struct net_device *in,
117 const struct net_device *out,
118 int (*okfn)(struct sk_buff *))
119{
120 enum ip_conntrack_info ctinfo __maybe_unused;
121 const struct nf_conn *ct __maybe_unused;
122 unsigned int ret;
123
124 ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
125#ifdef CONFIG_XFRM
126 if (ret != NF_DROP && ret != NF_STOLEN &&
127 !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
128 (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
129 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
130
131 if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
132 &ct->tuplehash[!dir].tuple.dst.u3) ||
133 (ct->tuplehash[dir].tuple.src.u.all !=
134 ct->tuplehash[!dir].tuple.dst.u.all))
135 if (nf_xfrm_me_harder(skb, AF_INET6) < 0)
136 ret = NF_DROP;
137 }
138#endif
139 return ret;
140}
141
142static unsigned int nf_nat_ipv6_output(const struct nf_hook_ops *ops,
143 struct sk_buff *skb,
144 const struct net_device *in,
145 const struct net_device *out,
146 int (*okfn)(struct sk_buff *))
147{
148 enum ip_conntrack_info ctinfo;
149 const struct nf_conn *ct;
150 unsigned int ret;
151
152 ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
153 if (ret != NF_DROP && ret != NF_STOLEN &&
154 (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
155 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
156
157 if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
158 &ct->tuplehash[!dir].tuple.src.u3)) {
159 if (ip6_route_me_harder(skb))
160 ret = NF_DROP;
161 }
162#ifdef CONFIG_XFRM
163 else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
164 ct->tuplehash[dir].tuple.dst.u.all !=
165 ct->tuplehash[!dir].tuple.src.u.all)
166 if (nf_xfrm_me_harder(skb, AF_INET6))
167 ret = NF_DROP;
168#endif
169 }
170 return ret;
171}
172
173static struct nf_chain_type nft_chain_nat_ipv6 = {
174 .family = NFPROTO_IPV6,
175 .name = "nat",
176 .type = NFT_CHAIN_T_NAT,
177 .hook_mask = (1 << NF_INET_PRE_ROUTING) |
178 (1 << NF_INET_POST_ROUTING) |
179 (1 << NF_INET_LOCAL_OUT) |
180 (1 << NF_INET_LOCAL_IN),
181 .fn = {
182 [NF_INET_PRE_ROUTING] = nf_nat_ipv6_prerouting,
183 [NF_INET_POST_ROUTING] = nf_nat_ipv6_postrouting,
184 [NF_INET_LOCAL_OUT] = nf_nat_ipv6_output,
185 [NF_INET_LOCAL_IN] = nf_nat_ipv6_fn,
186 },
187 .me = THIS_MODULE,
188};
189
190static int __init nft_chain_nat_ipv6_init(void)
191{
192 int err;
193
194 err = nft_register_chain_type(&nft_chain_nat_ipv6);
195 if (err < 0)
196 return err;
197
198 return 0;
199}
200
201static void __exit nft_chain_nat_ipv6_exit(void)
202{
203 nft_unregister_chain_type(&nft_chain_nat_ipv6);
204}
205
206module_init(nft_chain_nat_ipv6_init);
207module_exit(nft_chain_nat_ipv6_exit);
208
209MODULE_LICENSE("GPL");
210MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
211MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 49e362707379..48acec17e27a 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -450,6 +450,12 @@ config NFT_LIMIT
450 depends on NF_TABLES 450 depends on NF_TABLES
451 tristate "Netfilter nf_tables limit module" 451 tristate "Netfilter nf_tables limit module"
452 452
453config NFT_NAT
454 depends on NF_TABLES
455 depends on NF_CONNTRACK
456 depends on NF_NAT
457 tristate "Netfilter nf_tables nat module"
458
453config NFT_COMPAT 459config NFT_COMPAT
454 depends on NF_TABLES 460 depends on NF_TABLES
455 depends on NETFILTER_XTABLES 461 depends on NETFILTER_XTABLES
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index a6781450b6fb..394483b2c193 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o
75obj-$(CONFIG_NFT_META) += nft_meta.o 75obj-$(CONFIG_NFT_META) += nft_meta.o
76obj-$(CONFIG_NFT_CT) += nft_ct.o 76obj-$(CONFIG_NFT_CT) += nft_ct.o
77obj-$(CONFIG_NFT_LIMIT) += nft_limit.o 77obj-$(CONFIG_NFT_LIMIT) += nft_limit.o
78obj-$(CONFIG_NFT_NAT) += nft_nat.o
78#nf_tables-objs += nft_meta_target.o 79#nf_tables-objs += nft_meta_target.o
79obj-$(CONFIG_NFT_RBTREE) += nft_rbtree.o 80obj-$(CONFIG_NFT_RBTREE) += nft_rbtree.o
80obj-$(CONFIG_NFT_HASH) += nft_hash.o 81obj-$(CONFIG_NFT_HASH) += nft_hash.o
diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
new file mode 100644
index 000000000000..b0b87b2d2411
--- /dev/null
+++ b/net/netfilter/nft_nat.c
@@ -0,0 +1,220 @@
1/*
2 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
3 * Copyright (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
4 * Copyright (c) 2012 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/skbuff.h>
15#include <linux/ip.h>
16#include <linux/string.h>
17#include <linux/netlink.h>
18#include <linux/netfilter.h>
19#include <linux/netfilter_ipv4.h>
20#include <linux/netfilter/nfnetlink.h>
21#include <linux/netfilter/nf_tables.h>
22#include <net/netfilter/nf_conntrack.h>
23#include <net/netfilter/nf_nat.h>
24#include <net/netfilter/nf_nat_core.h>
25#include <net/netfilter/nf_tables.h>
26#include <net/netfilter/nf_nat_l3proto.h>
27#include <net/ip.h>
28
29struct nft_nat {
30 enum nft_registers sreg_addr_min:8;
31 enum nft_registers sreg_addr_max:8;
32 enum nft_registers sreg_proto_min:8;
33 enum nft_registers sreg_proto_max:8;
34 int family;
35 enum nf_nat_manip_type type;
36};
37
38static void nft_nat_eval(const struct nft_expr *expr,
39 struct nft_data data[NFT_REG_MAX + 1],
40 const struct nft_pktinfo *pkt)
41{
42 const struct nft_nat *priv = nft_expr_priv(expr);
43 enum ip_conntrack_info ctinfo;
44 struct nf_conn *ct = nf_ct_get(pkt->skb, &ctinfo);
45 struct nf_nat_range range;
46
47 memset(&range, 0, sizeof(range));
48 if (priv->sreg_addr_min) {
49 if (priv->family == AF_INET) {
50 range.min_addr.ip = data[priv->sreg_addr_min].data[0];
51 range.max_addr.ip = data[priv->sreg_addr_max].data[0];
52
53 } else {
54 memcpy(range.min_addr.ip6,
55 data[priv->sreg_addr_min].data,
56 sizeof(struct nft_data));
57 memcpy(range.max_addr.ip6,
58 data[priv->sreg_addr_max].data,
59 sizeof(struct nft_data));
60 }
61 range.flags |= NF_NAT_RANGE_MAP_IPS;
62 }
63
64 if (priv->sreg_proto_min) {
65 range.min_proto.all = data[priv->sreg_proto_min].data[0];
66 range.max_proto.all = data[priv->sreg_proto_max].data[0];
67 range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
68 }
69
70 data[NFT_REG_VERDICT].verdict =
71 nf_nat_setup_info(ct, &range, priv->type);
72}
73
74static const struct nla_policy nft_nat_policy[NFTA_NAT_MAX + 1] = {
75 [NFTA_NAT_TYPE] = { .type = NLA_U32 },
76 [NFTA_NAT_FAMILY] = { .type = NLA_U32 },
77 [NFTA_NAT_REG_ADDR_MIN] = { .type = NLA_U32 },
78 [NFTA_NAT_REG_ADDR_MAX] = { .type = NLA_U32 },
79 [NFTA_NAT_REG_PROTO_MIN] = { .type = NLA_U32 },
80 [NFTA_NAT_REG_PROTO_MAX] = { .type = NLA_U32 },
81};
82
83static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
84 const struct nlattr * const tb[])
85{
86 struct nft_nat *priv = nft_expr_priv(expr);
87 int err;
88
89 if (tb[NFTA_NAT_TYPE] == NULL)
90 return -EINVAL;
91
92 switch (ntohl(nla_get_be32(tb[NFTA_NAT_TYPE]))) {
93 case NFT_NAT_SNAT:
94 priv->type = NF_NAT_MANIP_SRC;
95 break;
96 case NFT_NAT_DNAT:
97 priv->type = NF_NAT_MANIP_DST;
98 break;
99 default:
100 return -EINVAL;
101 }
102
103 if (tb[NFTA_NAT_FAMILY] == NULL)
104 return -EINVAL;
105
106 priv->family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
107 if (priv->family != AF_INET && priv->family != AF_INET6)
108 return -EINVAL;
109
110 if (tb[NFTA_NAT_REG_ADDR_MIN]) {
111 priv->sreg_addr_min = ntohl(nla_get_be32(
112 tb[NFTA_NAT_REG_ADDR_MIN]));
113 err = nft_validate_input_register(priv->sreg_addr_min);
114 if (err < 0)
115 return err;
116 }
117
118 if (tb[NFTA_NAT_REG_ADDR_MAX]) {
119 priv->sreg_addr_max = ntohl(nla_get_be32(
120 tb[NFTA_NAT_REG_ADDR_MAX]));
121 err = nft_validate_input_register(priv->sreg_addr_max);
122 if (err < 0)
123 return err;
124 } else
125 priv->sreg_addr_max = priv->sreg_addr_min;
126
127 if (tb[NFTA_NAT_REG_PROTO_MIN]) {
128 priv->sreg_proto_min = ntohl(nla_get_be32(
129 tb[NFTA_NAT_REG_PROTO_MIN]));
130 err = nft_validate_input_register(priv->sreg_proto_min);
131 if (err < 0)
132 return err;
133 }
134
135 if (tb[NFTA_NAT_REG_PROTO_MAX]) {
136 priv->sreg_proto_max = ntohl(nla_get_be32(
137 tb[NFTA_NAT_REG_PROTO_MAX]));
138 err = nft_validate_input_register(priv->sreg_proto_max);
139 if (err < 0)
140 return err;
141 } else
142 priv->sreg_proto_max = priv->sreg_proto_min;
143
144 return 0;
145}
146
147static int nft_nat_dump(struct sk_buff *skb, const struct nft_expr *expr)
148{
149 const struct nft_nat *priv = nft_expr_priv(expr);
150
151 switch (priv->type) {
152 case NF_NAT_MANIP_SRC:
153 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_SNAT)))
154 goto nla_put_failure;
155 break;
156 case NF_NAT_MANIP_DST:
157 if (nla_put_be32(skb, NFTA_NAT_TYPE, htonl(NFT_NAT_DNAT)))
158 goto nla_put_failure;
159 break;
160 }
161
162 if (nla_put_be32(skb, NFTA_NAT_FAMILY, htonl(priv->family)))
163 goto nla_put_failure;
164 if (nla_put_be32(skb,
165 NFTA_NAT_REG_ADDR_MIN, htonl(priv->sreg_addr_min)))
166 goto nla_put_failure;
167 if (nla_put_be32(skb,
168 NFTA_NAT_REG_ADDR_MAX, htonl(priv->sreg_addr_max)))
169 goto nla_put_failure;
170 if (nla_put_be32(skb,
171 NFTA_NAT_REG_PROTO_MIN, htonl(priv->sreg_proto_min)))
172 goto nla_put_failure;
173 if (nla_put_be32(skb,
174 NFTA_NAT_REG_PROTO_MAX, htonl(priv->sreg_proto_max)))
175 goto nla_put_failure;
176 return 0;
177
178nla_put_failure:
179 return -1;
180}
181
182static struct nft_expr_type nft_nat_type;
183static const struct nft_expr_ops nft_nat_ops = {
184 .type = &nft_nat_type,
185 .size = NFT_EXPR_SIZE(sizeof(struct nft_nat)),
186 .eval = nft_nat_eval,
187 .init = nft_nat_init,
188 .dump = nft_nat_dump,
189};
190
191static struct nft_expr_type nft_nat_type __read_mostly = {
192 .name = "nat",
193 .ops = &nft_nat_ops,
194 .policy = nft_nat_policy,
195 .maxattr = NFTA_NAT_MAX,
196 .owner = THIS_MODULE,
197};
198
199static int __init nft_nat_module_init(void)
200{
201 int err;
202
203 err = nft_register_expr(&nft_nat_type);
204 if (err < 0)
205 return err;
206
207 return 0;
208}
209
210static void __exit nft_nat_module_exit(void)
211{
212 nft_unregister_expr(&nft_nat_type);
213}
214
215module_init(nft_nat_module_init);
216module_exit(nft_nat_module_exit);
217
218MODULE_LICENSE("GPL");
219MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
220MODULE_ALIAS_NFT_EXPR("nat");
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-17 11:58:25 -0400