2 * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
4 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
5 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/netfilter_ipv6/ip6_tables.h>
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
18 MODULE_DESCRIPTION("ip6tables filter table");
20 #define FILTER_VALID_HOOKS ((1 << NF_IP6_LOCAL_IN) | (1 << NF_IP6_FORWARD) | (1 << NF_IP6_LOCAL_OUT))
25 struct ip6t_entry entry
;
26 struct ip6t_standard_target target
;
29 struct ip6t_error_target
31 struct ip6t_entry_target target
;
32 char errorname
[IP6T_FUNCTION_MAXNAMELEN
];
37 struct ip6t_entry entry
;
38 struct ip6t_error_target target
;
43 struct ip6t_replace repl
;
44 struct ip6t_standard entries
[3];
45 struct ip6t_error term
;
46 } initial_table __initdata
47 = { { "filter", FILTER_VALID_HOOKS
, 4,
48 sizeof(struct ip6t_standard
) * 3 + sizeof(struct ip6t_error
),
49 { [NF_IP6_LOCAL_IN
] = 0,
50 [NF_IP6_FORWARD
] = sizeof(struct ip6t_standard
),
51 [NF_IP6_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 2 },
52 { [NF_IP6_LOCAL_IN
] = 0,
53 [NF_IP6_FORWARD
] = sizeof(struct ip6t_standard
),
54 [NF_IP6_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 2 },
58 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
60 sizeof(struct ip6t_entry
),
61 sizeof(struct ip6t_standard
),
63 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
66 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
68 sizeof(struct ip6t_entry
),
69 sizeof(struct ip6t_standard
),
71 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
74 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
76 sizeof(struct ip6t_entry
),
77 sizeof(struct ip6t_standard
),
79 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
83 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
85 sizeof(struct ip6t_entry
),
86 sizeof(struct ip6t_error
),
88 { { { { IP6T_ALIGN(sizeof(struct ip6t_error_target
)), IP6T_ERROR_TARGET
} },
95 static struct ip6t_table packet_filter
= {
97 .valid_hooks
= FILTER_VALID_HOOKS
,
98 .lock
= RW_LOCK_UNLOCKED
,
103 /* The work comes in here from netfilter.c. */
105 ip6t_hook(unsigned int hook
,
106 struct sk_buff
**pskb
,
107 const struct net_device
*in
,
108 const struct net_device
*out
,
109 int (*okfn
)(struct sk_buff
*))
111 return ip6t_do_table(pskb
, hook
, in
, out
, &packet_filter
, NULL
);
115 ip6t_local_out_hook(unsigned int hook
,
116 struct sk_buff
**pskb
,
117 const struct net_device
*in
,
118 const struct net_device
*out
,
119 int (*okfn
)(struct sk_buff
*))
122 /* root is playing with raw sockets. */
123 if ((*pskb
)->len
< sizeof(struct iphdr
)
124 || (*pskb
)->nh
.iph
->ihl
* 4 < sizeof(struct iphdr
)) {
126 printk("ip6t_hook: happy cracking.\n");
131 return ip6t_do_table(pskb
, hook
, in
, out
, &packet_filter
, NULL
);
134 static struct nf_hook_ops ip6t_ops
[] = {
137 .owner
= THIS_MODULE
,
139 .hooknum
= NF_IP6_LOCAL_IN
,
140 .priority
= NF_IP6_PRI_FILTER
,
144 .owner
= THIS_MODULE
,
146 .hooknum
= NF_IP6_FORWARD
,
147 .priority
= NF_IP6_PRI_FILTER
,
150 .hook
= ip6t_local_out_hook
,
151 .owner
= THIS_MODULE
,
153 .hooknum
= NF_IP6_LOCAL_OUT
,
154 .priority
= NF_IP6_PRI_FILTER
,
158 /* Default to forward because I got too much mail already. */
159 static int forward
= NF_ACCEPT
;
160 module_param(forward
, bool, 0000);
162 static int __init
ip6table_filter_init(void)
166 if (forward
< 0 || forward
> NF_MAX_VERDICT
) {
167 printk("iptables forward must be 0 or 1\n");
171 /* Entry 1 is the FORWARD hook */
172 initial_table
.entries
[1].target
.verdict
= -forward
- 1;
175 ret
= ip6t_register_table(&packet_filter
, &initial_table
.repl
);
180 ret
= nf_register_hook(&ip6t_ops
[0]);
184 ret
= nf_register_hook(&ip6t_ops
[1]);
188 ret
= nf_register_hook(&ip6t_ops
[2]);
195 nf_unregister_hook(&ip6t_ops
[1]);
197 nf_unregister_hook(&ip6t_ops
[0]);
199 ip6t_unregister_table(&packet_filter
);
204 static void __exit
ip6table_filter_fini(void)
208 for (i
= 0; i
< sizeof(ip6t_ops
)/sizeof(struct nf_hook_ops
); i
++)
209 nf_unregister_hook(&ip6t_ops
[i
]);
211 ip6t_unregister_table(&packet_filter
);
214 module_init(ip6table_filter_init
);
215 module_exit(ip6table_filter_fini
);