Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / netfilter / nft_chain_route_ipv6.c

diff --git a/kernel/net/ipv6/netfilter/nft_chain_route_ipv6.c b/kernel/net/ipv6/netfilter/nft_chain_route_ipv6.c
new file mode 100644 (file)
index 0000000..0dafdaa
--- /dev/null
+++ b/kernel/net/ipv6/netfilter/nft_chain_route_ipv6.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ * Copyright (c) 2012 Pablo Neira Ayuso <pablo@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.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv6.h>
+#include <net/route.h>
+
+static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
+                                       struct sk_buff *skb,
+                                       const struct nf_hook_state *state)
+{
+       unsigned int ret;
+       struct nft_pktinfo pkt;
+       struct in6_addr saddr, daddr;
+       u_int8_t hop_limit;
+       u32 mark, flowlabel;
+
+       /* malformed packet, drop it */
+       if (nft_set_pktinfo_ipv6(&pkt, ops, skb, state) < 0)
+               return NF_DROP;
+
+       /* save source/dest address, mark, hoplimit, flowlabel, priority */
+       memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
+       memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
+       mark = skb->mark;
+       hop_limit = ipv6_hdr(skb)->hop_limit;
+
+       /* flowlabel and prio (includes version, which shouldn't change either */
+       flowlabel = *((u32 *)ipv6_hdr(skb));
+
+       ret = nft_do_chain(&pkt, ops);
+       if (ret != NF_DROP && ret != NF_QUEUE &&
+           (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
+            memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
+            skb->mark != mark ||
+            ipv6_hdr(skb)->hop_limit != hop_limit ||
+            flowlabel != *((u_int32_t *)ipv6_hdr(skb))))
+               return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
+
+       return ret;
+}
+
+static const struct nf_chain_type nft_chain_route_ipv6 = {
+       .name           = "route",
+       .type           = NFT_CHAIN_T_ROUTE,
+       .family         = NFPROTO_IPV6,
+        .owner         = THIS_MODULE,
+       .hook_mask      = (1 << NF_INET_LOCAL_OUT),
+       .hooks          = {
+                [NF_INET_LOCAL_OUT]    = nf_route_table_hook,
+        },
+};
+
+static int __init nft_chain_route_init(void)
+{
+       return nft_register_chain_type(&nft_chain_route_ipv6);
+}
+
+static void __exit nft_chain_route_exit(void)
+{
+       nft_unregister_chain_type(&nft_chain_route_ipv6);
+}
+
+module_init(nft_chain_route_init);
+module_exit(nft_chain_route_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_CHAIN(AF_INET6, "route");