Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@xxxxxxxxxxxxxxx>
---
net/ipv6/netfilter/Kconfig | 5 +
net/ipv6/netfilter/Makefile | 2 +
net/ipv6/netfilter/nft_chain_nat_ipv6.c | 209 ++++++++++++++++++++++++++++++++
3 files changed, 216 insertions(+)
create mode 100644 net/ipv6/netfilter/nft_chain_nat_ipv6.c
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 20ab251..0be3357 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -33,6 +33,11 @@ config NFT_CHAIN_ROUTE_IPV6
depends on NF_TABLES_IPV6
tristate "IPv6 nf_tables route chain support"
+config NFT_CHAIN_NAT_IPV6
+ depends on NF_TABLES_IPV6
+ depends on NFT_NAT
+ tristate "IPv6 nf_tables nat chain support"
+
config IP6_NF_IPTABLES
tristate "IP6 tables support (required for filtering)"
depends on INET && IPV6
diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index cc19b60..07155bd 100644
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -26,6 +26,8 @@ obj-$(CONFIG_NF_DEFRAG_IPV6) += nf_defrag_ipv6.o
# nf_tables
obj-$(CONFIG_NF_TABLES_IPV6) += nf_tables_ipv6.o
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV6) += nft_chain_route_ipv6.o
+nft_chain_nat_ipv6-y := nf_nat_l3proto_ipv6.o nf_nat_proto_icmpv6.o
+obj-$(CONFIG_NFT_CHAIN_NAT_IPV6) += nft_chain_nat_ipv6.o
# matches
obj-$(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 0000000..c585807
--- /dev/null
+++ b/net/ipv6/netfilter/nft_chain_nat_ipv6.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@xxxxxxxxx>
+ * Copyright (c) 2012 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/ipv6.h>
+
+/*
+ * IPv6 NAT chains
+ */
+
+static unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+ struct nf_conn_nat *nat;
+ enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
+ __be16 frag_off;
+ int hdrlen;
+ u8 nexthdr;
+ unsigned int ret;
+
+ if (ct == NULL || nf_ct_is_untracked(ct))
+ return NF_ACCEPT;
+
+ NF_CT_ASSERT(!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)));
+
+ nat = nfct_nat(ct);
+ if (nat == NULL) {
+ /* Conntrack module was loaded late, can't add extension. */
+ if (nf_ct_is_confirmed(ct))
+ return NF_ACCEPT;
+ nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
+ if (nat == NULL)
+ return NF_ACCEPT;
+ }
+
+ switch (ctinfo) {
+ case IP_CT_RELATED:
+ case IP_CT_RELATED + IP_CT_IS_REPLY:
+ nexthdr = ipv6_hdr(skb)->nexthdr;
+ hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
+
+ if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
+ if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
+ ops->hooknum,
+ hdrlen))
+ return NF_DROP;
+ else
+ return NF_ACCEPT;
+ }
+ /* Fall through */
+ case IP_CT_NEW:
+ if (nf_nat_initialized(ct, maniptype))
+ break;
+
+ ret = nft_do_chain(ops, skb, in, out, okfn);
+ if (ret != NF_ACCEPT)
+ return ret;
+ if (!nf_nat_initialized(ct, maniptype)) {
+ ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
+ if (ret != NF_ACCEPT)
+ return ret;
+ }
+ default:
+ break;
+ }
+
+ return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
+}
+
+static unsigned int nf_nat_ipv6_prerouting(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct in6_addr daddr = ipv6_hdr(skb)->daddr;
+ unsigned int ret;
+
+ ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
+ skb_dst_drop(skb);
+
+ return ret;
+}
+
+static unsigned int nf_nat_ipv6_postrouting(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ enum ip_conntrack_info ctinfo __maybe_unused;
+ const struct nf_conn *ct __maybe_unused;
+ unsigned int ret;
+
+ ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
+#ifdef CONFIG_XFRM
+ if (ret != NF_DROP && ret != NF_STOLEN &&
+ !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+
+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
+ &ct->tuplehash[!dir].tuple.dst.u3) ||
+ (ct->tuplehash[dir].tuple.src.u.all !=
+ ct->tuplehash[!dir].tuple.dst.u.all))
+ if (nf_xfrm_me_harder(skb, AF_INET6) < 0)
+ ret = NF_DROP;
+ }
+#endif
+ return ret;
+}
+
+static unsigned int nf_nat_ipv6_output(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ enum ip_conntrack_info ctinfo;
+ const struct nf_conn *ct;
+ unsigned int ret;
+
+ ret = nf_nat_ipv6_fn(ops, 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);
+
+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
+ &ct->tuplehash[!dir].tuple.src.u3)) {
+ if (ip6_route_me_harder(skb))
+ ret = NF_DROP;
+ }
+#ifdef CONFIG_XFRM
+ else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ ct->tuplehash[dir].tuple.dst.u.all !=
+ ct->tuplehash[!dir].tuple.src.u.all)
+ if (nf_xfrm_me_harder(skb, AF_INET6))
+ ret = NF_DROP;
+#endif
+ }
+ return ret;
+}
+
+struct nf_chain_type nft_chain_nat_ipv6 = {
+ .family = NFPROTO_IPV6,
+ .name = "nat",
+ .type = NFT_CHAIN_T_NAT,
+ .hook_mask = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_LOCAL_IN),
+ .fn = {
+ [NF_INET_PRE_ROUTING] = nf_nat_ipv6_prerouting,
+ [NF_INET_POST_ROUTING] = nf_nat_ipv6_postrouting,
+ [NF_INET_LOCAL_OUT] = nf_nat_ipv6_output,
+ [NF_INET_LOCAL_IN] = nf_nat_ipv6_fn,
+ },
+ .me = THIS_MODULE,
+};
+
+static int __init nft_chain_nat_ipv6_init(void)
+{
+ int err;
+
+ err = nft_register_chain_type(&nft_chain_nat_ipv6);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static void __exit nft_chain_nat_ipv6_exit(void)
+{
+ nft_unregister_chain_type(&nft_chain_nat_ipv6);
+}
+
+module_init(nft_chain_nat_ipv6_init);
+module_exit(nft_chain_nat_ipv6_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@xxxxxxxxxxxxxxx>");
+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
--
1.8.0
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