Commit 17e6e59f authored by James Morris's avatar James Morris Committed by David S. Miller

netfilter: ip6_tables: add ip6tables security table

This is a port of the IPv4 security table for IPv6.
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 560ee653
......@@ -64,6 +64,7 @@ enum nf_ip6_hook_priorities {
NF_IP6_PRI_MANGLE = -150,
NF_IP6_PRI_NAT_DST = -100,
NF_IP6_PRI_FILTER = 0,
NF_IP6_PRI_SECURITY = 50,
NF_IP6_PRI_NAT_SRC = 100,
NF_IP6_PRI_SELINUX_LAST = 225,
NF_IP6_PRI_LAST = INT_MAX,
......
......@@ -35,6 +35,7 @@ struct netns_ipv6 {
struct xt_table *ip6table_filter;
struct xt_table *ip6table_mangle;
struct xt_table *ip6table_raw;
struct xt_table *ip6table_security;
#endif
struct rt6_info *ip6_null_entry;
struct rt6_statistics *rt6_stats;
......
......@@ -208,5 +208,17 @@ config IP6_NF_RAW
If you want to compile it as a module, say M here and read
<file:Documentation/kbuild/modules.txt>. If unsure, say `N'.
# security table for MAC policy
config IP6_NF_SECURITY
tristate "Security table"
depends on IP6_NF_IPTABLES
depends on SECURITY
default m if NETFILTER_ADVANCED=n
help
This option adds a `security' table to iptables, for use
with Mandatory Access Control (MAC) policy.
If unsure, say N.
endmenu
......@@ -8,6 +8,7 @@ obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
obj-$(CONFIG_IP6_NF_SECURITY) += ip6table_security.o
# objects for l3 independent conntrack
nf_conntrack_ipv6-objs := nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o
......
/*
* "security" table for IPv6
*
* This is for use by Mandatory Access Control (MAC) security models,
* which need to be able to manage security policy in separate context
* to DAC.
*
* Based on iptable_mangle.c
*
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
* Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
* Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
*
* 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("James Morris <jmorris <at> redhat.com>");
MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT)
static struct
{
struct ip6t_replace repl;
struct ip6t_standard entries[3];
struct ip6t_error term;
} initial_table __initdata = {
.repl = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
.hook_entry = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
},
.underflow = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
},
},
.entries = {
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IP6T_ERROR_INIT, /* ERROR */
};
static struct xt_table security_table = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
.lock = __RW_LOCK_UNLOCKED(security_table.lock),
.me = THIS_MODULE,
.af = AF_INET6,
};
static unsigned int
ip6t_local_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,
init_net.ipv6.ip6table_security);
}
static unsigned int
ip6t_forward_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,
init_net.ipv6.ip6table_security);
}
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 *))
{
/* TBD: handle short packets via raw socket */
return ip6t_do_table(skb, hook, in, out,
init_net.ipv6.ip6table_security);
}
static struct nf_hook_ops ip6t_ops[] __read_mostly = {
{
.hook = ip6t_local_in_hook,
.owner = THIS_MODULE,
.pf = PF_INET6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_SECURITY,
},
{
.hook = ip6t_forward_hook,
.owner = THIS_MODULE,
.pf = PF_INET6,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP6_PRI_SECURITY,
},
{
.hook = ip6t_local_out_hook,
.owner = THIS_MODULE,
.pf = PF_INET6,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP6_PRI_SECURITY,
},
};
static int __net_init ip6table_security_net_init(struct net *net)
{
net->ipv6.ip6table_security =
ip6t_register_table(net, &security_table, &initial_table.repl);
if (IS_ERR(net->ipv6.ip6table_security))
return PTR_ERR(net->ipv6.ip6table_security);
return 0;
}
static void __net_exit ip6table_security_net_exit(struct net *net)
{
ip6t_unregister_table(net->ipv6.ip6table_security);
}
static struct pernet_operations ip6table_security_net_ops = {
.init = ip6table_security_net_init,
.exit = ip6table_security_net_exit,
};
static int __init ip6table_security_init(void)
{
int ret;
ret = register_pernet_subsys(&ip6table_security_net_ops);
if (ret < 0)
return ret;
ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
if (ret < 0)
goto cleanup_table;
return ret;
cleanup_table:
unregister_pernet_subsys(&ip6table_security_net_ops);
return ret;
}
static void __exit ip6table_security_fini(void)
{
nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
unregister_pernet_subsys(&ip6table_security_net_ops);
}
module_init(ip6table_security_init);
module_exit(ip6table_security_fini);
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