2 * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT .
4 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
6 #include <linux/module.h>
7 #include <linux/netfilter_ipv4/ip_tables.h>
10 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
14 struct ipt_replace repl
;
15 struct ipt_standard entries
[2];
16 struct ipt_error term
;
17 } initial_table __net_initdata
= {
20 .valid_hooks
= RAW_VALID_HOOKS
,
22 .size
= sizeof(struct ipt_standard
) * 2 + sizeof(struct ipt_error
),
24 [NF_INET_PRE_ROUTING
] = 0,
25 [NF_INET_LOCAL_OUT
] = sizeof(struct ipt_standard
)
28 [NF_INET_PRE_ROUTING
] = 0,
29 [NF_INET_LOCAL_OUT
] = sizeof(struct ipt_standard
)
33 IPT_STANDARD_INIT(NF_ACCEPT
), /* PRE_ROUTING */
34 IPT_STANDARD_INIT(NF_ACCEPT
), /* LOCAL_OUT */
36 .term
= IPT_ERROR_INIT
, /* ERROR */
39 static struct xt_table packet_raw
= {
41 .valid_hooks
= RAW_VALID_HOOKS
,
42 .lock
= __RW_LOCK_UNLOCKED(packet_raw
.lock
),
47 /* The work comes in here from netfilter.c. */
49 ipt_hook(unsigned int hook
,
51 const struct net_device
*in
,
52 const struct net_device
*out
,
53 int (*okfn
)(struct sk_buff
*))
55 return ipt_do_table(skb
, hook
, in
, out
,
56 dev_net(in
)->ipv4
.iptable_raw
);
60 ipt_local_hook(unsigned int hook
,
62 const struct net_device
*in
,
63 const struct net_device
*out
,
64 int (*okfn
)(struct sk_buff
*))
66 /* root is playing with raw sockets. */
67 if (skb
->len
< sizeof(struct iphdr
) ||
68 ip_hdrlen(skb
) < sizeof(struct iphdr
)) {
70 printk("iptable_raw: ignoring short SOCK_RAW "
74 return ipt_do_table(skb
, hook
, in
, out
,
75 dev_net(out
)->ipv4
.iptable_raw
);
78 /* 'raw' is the very first table. */
79 static struct nf_hook_ops ipt_ops
[] __read_mostly
= {
83 .hooknum
= NF_INET_PRE_ROUTING
,
84 .priority
= NF_IP_PRI_RAW
,
88 .hook
= ipt_local_hook
,
90 .hooknum
= NF_INET_LOCAL_OUT
,
91 .priority
= NF_IP_PRI_RAW
,
96 static int __net_init
iptable_raw_net_init(struct net
*net
)
99 net
->ipv4
.iptable_raw
=
100 ipt_register_table(net
, &packet_raw
, &initial_table
.repl
);
101 if (IS_ERR(net
->ipv4
.iptable_raw
))
102 return PTR_ERR(net
->ipv4
.iptable_raw
);
106 static void __net_exit
iptable_raw_net_exit(struct net
*net
)
108 ipt_unregister_table(net
->ipv4
.iptable_raw
);
111 static struct pernet_operations iptable_raw_net_ops
= {
112 .init
= iptable_raw_net_init
,
113 .exit
= iptable_raw_net_exit
,
116 static int __init
iptable_raw_init(void)
120 ret
= register_pernet_subsys(&iptable_raw_net_ops
);
125 ret
= nf_register_hooks(ipt_ops
, ARRAY_SIZE(ipt_ops
));
132 unregister_pernet_subsys(&iptable_raw_net_ops
);
136 static void __exit
iptable_raw_fini(void)
138 nf_unregister_hooks(ipt_ops
, ARRAY_SIZE(ipt_ops
));
139 unregister_pernet_subsys(&iptable_raw_net_ops
);
142 module_init(iptable_raw_init
);
143 module_exit(iptable_raw_fini
);
144 MODULE_LICENSE("GPL");