Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 221 insertions, 0 deletions

diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
new file mode 100644
index 0000000..d0b31b2
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -0,0 +1,221 @@
+/*
+ * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
+ *
+ * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@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.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("ip6tables mangle table");
+
+#define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
+			    (1 << NF_INET_LOCAL_IN) | \
+			    (1 << NF_INET_FORWARD) | \
+			    (1 << NF_INET_LOCAL_OUT) | \
+			    (1 << NF_INET_POST_ROUTING))
+
+static struct
+{
+	struct ip6t_replace repl;
+	struct ip6t_standard entries[5];
+	struct ip6t_error term;
+} initial_table __net_initdata = {
+	.repl = {
+		.name = "mangle",
+		.valid_hooks = MANGLE_VALID_HOOKS,
+		.num_entries = 6,
+		.size = sizeof(struct ip6t_standard) * 5 + sizeof(struct ip6t_error),
+		.hook_entry = {
+			[NF_INET_PRE_ROUTING] 	= 0,
+			[NF_INET_LOCAL_IN]	= sizeof(struct ip6t_standard),
+			[NF_INET_FORWARD]	= sizeof(struct ip6t_standard) * 2,
+			[NF_INET_LOCAL_OUT] 	= sizeof(struct ip6t_standard) * 3,
+			[NF_INET_POST_ROUTING]	= sizeof(struct ip6t_standard) * 4,
+		},
+		.underflow = {
+			[NF_INET_PRE_ROUTING] 	= 0,
+			[NF_INET_LOCAL_IN]	= sizeof(struct ip6t_standard),
+			[NF_INET_FORWARD]	= sizeof(struct ip6t_standard) * 2,
+			[NF_INET_LOCAL_OUT] 	= sizeof(struct ip6t_standard) * 3,
+			[NF_INET_POST_ROUTING]	= sizeof(struct ip6t_standard) * 4,
+		},
+	},
+	.entries = {
+		IP6T_STANDARD_INIT(NF_ACCEPT),	/* PRE_ROUTING */
+		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_IN */
+		IP6T_STANDARD_INIT(NF_ACCEPT),	/* FORWARD */
+		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_OUT */
+		IP6T_STANDARD_INIT(NF_ACCEPT),	/* POST_ROUTING */
+	},
+	.term = IP6T_ERROR_INIT,		/* ERROR */
+};
+
+static struct xt_table packet_mangler = {
+	.name		= "mangle",
+	.valid_hooks	= MANGLE_VALID_HOOKS,
+	.lock		= __RW_LOCK_UNLOCKED(packet_mangler.lock),
+	.me		= THIS_MODULE,
+	.af		= AF_INET6,
+};
+
+/* The work comes in here from netfilter.c. */
+static unsigned int
+ip6t_in_hook(unsigned int hook,
+	 struct sk_buff *skb,
+	 const struct net_device *in,
+	 const struct net_device *out,
+	 int (*okfn)(struct sk_buff *))
+{
+	return ip6t_do_table(skb, hook, in, out,
+			     dev_net(in)->ipv6.ip6table_mangle);
+}
+
+static unsigned int
+ip6t_post_routing_hook(unsigned int hook,
+		struct sk_buff *skb,
+		const struct net_device *in,
+		const struct net_device *out,
+		int (*okfn)(struct sk_buff *))
+{
+	return ip6t_do_table(skb, hook, in, out,
+			     dev_net(out)->ipv6.ip6table_mangle);
+}
+
+static unsigned int
+ip6t_local_out_hook(unsigned int hook,
+		   struct sk_buff *skb,
+		   const struct net_device *in,
+		   const struct net_device *out,
+		   int (*okfn)(struct sk_buff *))
+{
+
+	unsigned int ret;
+	struct in6_addr saddr, daddr;
+	u_int8_t hop_limit;
+	u_int32_t flowlabel, mark;
+
+#if 0
+	/* root is playing with raw sockets. */
+	if (skb->len < sizeof(struct iphdr)
+	    || ip_hdrlen(skb) < sizeof(struct iphdr)) {
+		if (net_ratelimit())
+			printk("ip6t_hook: happy cracking.\n");
+		return NF_ACCEPT;
+	}
+#endif
+
+	/* 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 = *((u_int32_t *)ipv6_hdr(skb));
+
+	ret = ip6t_do_table(skb, hook, in, out,
+			    dev_net(out)->ipv6.ip6table_mangle);
+
+	if (ret != NF_DROP && ret != NF_STOLEN
+		&& (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))
+		return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
+
+	return ret;
+}
+
+static struct nf_hook_ops ip6t_ops[] __read_mostly = {
+	{
+		.hook		= ip6t_in_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum	= NF_INET_PRE_ROUTING,
+		.priority	= NF_IP6_PRI_MANGLE,
+	},
+	{
+		.hook		= ip6t_in_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum	= NF_INET_LOCAL_IN,
+		.priority	= NF_IP6_PRI_MANGLE,
+	},
+	{
+		.hook		= ip6t_in_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum	= NF_INET_FORWARD,
+		.priority	= NF_IP6_PRI_MANGLE,
+	},
+	{
+		.hook		= ip6t_local_out_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum	= NF_INET_LOCAL_OUT,
+		.priority	= NF_IP6_PRI_MANGLE,
+	},
+	{
+		.hook		= ip6t_post_routing_hook,
+		.owner		= THIS_MODULE,
+		.pf		= PF_INET6,
+		.hooknum	= NF_INET_POST_ROUTING,
+		.priority	= NF_IP6_PRI_MANGLE,
+	},
+};
+
+static int __net_init ip6table_mangle_net_init(struct net *net)
+{
+	/* Register table */
+	net->ipv6.ip6table_mangle =
+		ip6t_register_table(net, &packet_mangler, &initial_table.repl);
+	if (IS_ERR(net->ipv6.ip6table_mangle))
+		return PTR_ERR(net->ipv6.ip6table_mangle);
+	return 0;
+}
+
+static void __net_exit ip6table_mangle_net_exit(struct net *net)
+{
+	ip6t_unregister_table(net->ipv6.ip6table_mangle);
+}
+
+static struct pernet_operations ip6table_mangle_net_ops = {
+	.init = ip6table_mangle_net_init,
+	.exit = ip6table_mangle_net_exit,
+};
+
+static int __init ip6table_mangle_init(void)
+{
+	int ret;
+
+	ret = register_pernet_subsys(&ip6table_mangle_net_ops);
+	if (ret < 0)
+		return ret;
+
+	/* Register hooks */
+	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+	if (ret < 0)
+		goto cleanup_table;
+
+	return ret;
+
+ cleanup_table:
+	unregister_pernet_subsys(&ip6table_mangle_net_ops);
+	return ret;
+}
+
+static void __exit ip6table_mangle_fini(void)
+{
+	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+	unregister_pernet_subsys(&ip6table_mangle_net_ops);
+}
+
+module_init(ip6table_mangle_init);
+module_exit(ip6table_mangle_fini);