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@@ -0,0 +1,211 @@
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+/*
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+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
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+ * Copyright (c) 2012 Intel Corporation
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/list.h>
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+#include <linux/skbuff.h>
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+#include <linux/ip.h>
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+#include <linux/netfilter.h>
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+#include <linux/netfilter_ipv6.h>
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+#include <linux/netfilter/nf_tables.h>
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+#include <net/netfilter/nf_conntrack.h>
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+#include <net/netfilter/nf_nat.h>
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+#include <net/netfilter/nf_nat_core.h>
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+#include <net/netfilter/nf_tables.h>
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+#include <net/netfilter/nf_tables_ipv6.h>
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+#include <net/netfilter/nf_nat_l3proto.h>
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+#include <net/ipv6.h>
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+
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+/*
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+ * IPv6 NAT chains
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+ */
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+
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+static unsigned int nf_nat_ipv6_fn(const struct nf_hook_ops *ops,
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+ struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ int (*okfn)(struct sk_buff *))
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+{
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+ enum ip_conntrack_info ctinfo;
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+ struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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+ struct nf_conn_nat *nat;
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+ enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
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+ __be16 frag_off;
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+ int hdrlen;
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+ u8 nexthdr;
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+ struct nft_pktinfo pkt;
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+ unsigned int ret;
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+
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+ if (ct == NULL || nf_ct_is_untracked(ct))
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+ return NF_ACCEPT;
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+
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+ nat = nfct_nat(ct);
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+ if (nat == NULL) {
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+ /* Conntrack module was loaded late, can't add extension. */
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+ if (nf_ct_is_confirmed(ct))
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+ return NF_ACCEPT;
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+ nat = nf_ct_ext_add(ct, NF_CT_EXT_NAT, GFP_ATOMIC);
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+ if (nat == NULL)
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+ return NF_ACCEPT;
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+ }
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+
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+ switch (ctinfo) {
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+ case IP_CT_RELATED:
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+ case IP_CT_RELATED + IP_CT_IS_REPLY:
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+ nexthdr = ipv6_hdr(skb)->nexthdr;
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+ hdrlen = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
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+ &nexthdr, &frag_off);
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+
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+ if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
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+ if (!nf_nat_icmpv6_reply_translation(skb, ct, ctinfo,
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+ ops->hooknum,
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+ hdrlen))
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+ return NF_DROP;
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+ else
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+ return NF_ACCEPT;
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+ }
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+ /* Fall through */
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+ case IP_CT_NEW:
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+ if (nf_nat_initialized(ct, maniptype))
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+ break;
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+
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+ nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out);
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+
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+ ret = nft_do_chain_pktinfo(&pkt, ops);
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+ if (ret != NF_ACCEPT)
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+ return ret;
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+ if (!nf_nat_initialized(ct, maniptype)) {
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+ ret = nf_nat_alloc_null_binding(ct, ops->hooknum);
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+ if (ret != NF_ACCEPT)
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+ return ret;
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+ }
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+ default:
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+ break;
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+ }
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+
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+ return nf_nat_packet(ct, ctinfo, ops->hooknum, skb);
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+}
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+
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+static unsigned int nf_nat_ipv6_prerouting(const struct nf_hook_ops *ops,
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+ struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ int (*okfn)(struct sk_buff *))
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+{
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+ struct in6_addr daddr = ipv6_hdr(skb)->daddr;
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+ unsigned int ret;
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+
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+ ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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+ if (ret != NF_DROP && ret != NF_STOLEN &&
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+ ipv6_addr_cmp(&daddr, &ipv6_hdr(skb)->daddr))
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+ skb_dst_drop(skb);
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+
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+ return ret;
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+}
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+
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+static unsigned int nf_nat_ipv6_postrouting(const struct nf_hook_ops *ops,
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+ struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ int (*okfn)(struct sk_buff *))
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+{
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+ enum ip_conntrack_info ctinfo __maybe_unused;
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+ const struct nf_conn *ct __maybe_unused;
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+ unsigned int ret;
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+
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+ ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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+#ifdef CONFIG_XFRM
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+ if (ret != NF_DROP && ret != NF_STOLEN &&
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+ !(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
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+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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+
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+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.src.u3,
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+ &ct->tuplehash[!dir].tuple.dst.u3) ||
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+ (ct->tuplehash[dir].tuple.src.u.all !=
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+ ct->tuplehash[!dir].tuple.dst.u.all))
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+ if (nf_xfrm_me_harder(skb, AF_INET6) < 0)
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+ ret = NF_DROP;
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+ }
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+#endif
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+ return ret;
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+}
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+
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+static unsigned int nf_nat_ipv6_output(const struct nf_hook_ops *ops,
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+ struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ int (*okfn)(struct sk_buff *))
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+{
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+ enum ip_conntrack_info ctinfo;
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+ const struct nf_conn *ct;
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+ unsigned int ret;
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+
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+ ret = nf_nat_ipv6_fn(ops, skb, in, out, okfn);
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+ if (ret != NF_DROP && ret != NF_STOLEN &&
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+ (ct = nf_ct_get(skb, &ctinfo)) != NULL) {
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+ enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
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+
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+ if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
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+ &ct->tuplehash[!dir].tuple.src.u3)) {
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+ if (ip6_route_me_harder(skb))
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+ ret = NF_DROP;
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+ }
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+#ifdef CONFIG_XFRM
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+ else if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
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+ ct->tuplehash[dir].tuple.dst.u.all !=
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+ ct->tuplehash[!dir].tuple.src.u.all)
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+ if (nf_xfrm_me_harder(skb, AF_INET6))
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+ ret = NF_DROP;
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+#endif
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+ }
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+ return ret;
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+}
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+
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+static struct nf_chain_type nft_chain_nat_ipv6 = {
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+ .family = NFPROTO_IPV6,
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+ .name = "nat",
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+ .type = NFT_CHAIN_T_NAT,
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+ .hook_mask = (1 << NF_INET_PRE_ROUTING) |
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+ (1 << NF_INET_POST_ROUTING) |
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+ (1 << NF_INET_LOCAL_OUT) |
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+ (1 << NF_INET_LOCAL_IN),
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+ .fn = {
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+ [NF_INET_PRE_ROUTING] = nf_nat_ipv6_prerouting,
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+ [NF_INET_POST_ROUTING] = nf_nat_ipv6_postrouting,
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+ [NF_INET_LOCAL_OUT] = nf_nat_ipv6_output,
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+ [NF_INET_LOCAL_IN] = nf_nat_ipv6_fn,
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+ },
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+ .me = THIS_MODULE,
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+};
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+
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+static int __init nft_chain_nat_ipv6_init(void)
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+{
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+ int err;
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+
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+ err = nft_register_chain_type(&nft_chain_nat_ipv6);
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+ if (err < 0)
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+ return err;
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+
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+ return 0;
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+}
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+
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+static void __exit nft_chain_nat_ipv6_exit(void)
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+{
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+ nft_unregister_chain_type(&nft_chain_nat_ipv6);
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+}
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+
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+module_init(nft_chain_nat_ipv6_init);
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+module_exit(nft_chain_nat_ipv6_exit);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
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+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "nat");
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Tomasz Bursztyka