2 * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
4 * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
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.
11 #include <linux/module.h>
12 #include <linux/netfilter_ipv6/ip6_tables.h>
14 MODULE_LICENSE("GPL");
15 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
16 MODULE_DESCRIPTION("ip6tables mangle table");
18 #define MANGLE_VALID_HOOKS ((1 << NF_IP6_PRE_ROUTING) | \
19 (1 << NF_IP6_LOCAL_IN) | \
20 (1 << NF_IP6_FORWARD) | \
21 (1 << NF_IP6_LOCAL_OUT) | \
22 (1 << NF_IP6_POST_ROUTING))
25 #define DEBUGP(x, args...) printk(KERN_DEBUG x, ## args)
27 #define DEBUGP(x, args...)
32 struct ip6t_replace repl
;
33 struct ip6t_standard entries
[5];
34 struct ip6t_error term
;
35 } initial_table __initdata
36 = { { "mangle", MANGLE_VALID_HOOKS
, 6,
37 sizeof(struct ip6t_standard
) * 5 + sizeof(struct ip6t_error
),
38 { [NF_IP6_PRE_ROUTING
] = 0,
39 [NF_IP6_LOCAL_IN
] = sizeof(struct ip6t_standard
),
40 [NF_IP6_FORWARD
] = sizeof(struct ip6t_standard
) * 2,
41 [NF_IP6_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 3,
42 [NF_IP6_POST_ROUTING
] = sizeof(struct ip6t_standard
) * 4},
43 { [NF_IP6_PRE_ROUTING
] = 0,
44 [NF_IP6_LOCAL_IN
] = sizeof(struct ip6t_standard
),
45 [NF_IP6_FORWARD
] = sizeof(struct ip6t_standard
) * 2,
46 [NF_IP6_LOCAL_OUT
] = sizeof(struct ip6t_standard
) * 3,
47 [NF_IP6_POST_ROUTING
] = sizeof(struct ip6t_standard
) * 4},
51 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
53 sizeof(struct ip6t_entry
),
54 sizeof(struct ip6t_standard
),
56 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
59 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
61 sizeof(struct ip6t_entry
),
62 sizeof(struct ip6t_standard
),
64 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
67 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
69 sizeof(struct ip6t_entry
),
70 sizeof(struct ip6t_standard
),
72 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
75 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
77 sizeof(struct ip6t_entry
),
78 sizeof(struct ip6t_standard
),
80 { { { { 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_standard
),
88 { { { { IP6T_ALIGN(sizeof(struct ip6t_standard_target
)), "" } }, { } },
92 { { { { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, { { { 0 } } }, "", "", { 0 }, { 0 }, 0, 0, 0 },
94 sizeof(struct ip6t_entry
),
95 sizeof(struct ip6t_error
),
97 { { { { IP6T_ALIGN(sizeof(struct ip6t_error_target
)), IP6T_ERROR_TARGET
} },
104 static struct xt_table packet_mangler
= {
106 .valid_hooks
= MANGLE_VALID_HOOKS
,
107 .lock
= RW_LOCK_UNLOCKED
,
112 /* The work comes in here from netfilter.c. */
114 ip6t_route_hook(unsigned int hook
,
115 struct sk_buff
**pskb
,
116 const struct net_device
*in
,
117 const struct net_device
*out
,
118 int (*okfn
)(struct sk_buff
*))
120 return ip6t_do_table(pskb
, hook
, in
, out
, &packet_mangler
);
124 ip6t_local_hook(unsigned int hook
,
125 struct sk_buff
**pskb
,
126 const struct net_device
*in
,
127 const struct net_device
*out
,
128 int (*okfn
)(struct sk_buff
*))
132 struct in6_addr saddr
, daddr
;
134 u_int32_t flowlabel
, mark
;
137 /* root is playing with raw sockets. */
138 if ((*pskb
)->len
< sizeof(struct iphdr
)
139 || ip_hdrlen(*pskb
) < sizeof(struct iphdr
)) {
141 printk("ip6t_hook: happy cracking.\n");
146 /* save source/dest address, mark, hoplimit, flowlabel, priority, */
147 memcpy(&saddr
, &ipv6_hdr(*pskb
)->saddr
, sizeof(saddr
));
148 memcpy(&daddr
, &ipv6_hdr(*pskb
)->daddr
, sizeof(daddr
));
149 mark
= (*pskb
)->mark
;
150 hop_limit
= ipv6_hdr(*pskb
)->hop_limit
;
152 /* flowlabel and prio (includes version, which shouldn't change either */
153 flowlabel
= *((u_int32_t
*)ipv6_hdr(*pskb
));
155 ret
= ip6t_do_table(pskb
, hook
, in
, out
, &packet_mangler
);
157 if (ret
!= NF_DROP
&& ret
!= NF_STOLEN
158 && (memcmp(&ipv6_hdr(*pskb
)->saddr
, &saddr
, sizeof(saddr
))
159 || memcmp(&ipv6_hdr(*pskb
)->daddr
, &daddr
, sizeof(daddr
))
160 || (*pskb
)->mark
!= mark
161 || ipv6_hdr(*pskb
)->hop_limit
!= hop_limit
))
162 return ip6_route_me_harder(*pskb
) == 0 ? ret
: NF_DROP
;
167 static struct nf_hook_ops ip6t_ops
[] = {
169 .hook
= ip6t_route_hook
,
170 .owner
= THIS_MODULE
,
172 .hooknum
= NF_IP6_PRE_ROUTING
,
173 .priority
= NF_IP6_PRI_MANGLE
,
176 .hook
= ip6t_local_hook
,
177 .owner
= THIS_MODULE
,
179 .hooknum
= NF_IP6_LOCAL_IN
,
180 .priority
= NF_IP6_PRI_MANGLE
,
183 .hook
= ip6t_route_hook
,
184 .owner
= THIS_MODULE
,
186 .hooknum
= NF_IP6_FORWARD
,
187 .priority
= NF_IP6_PRI_MANGLE
,
190 .hook
= ip6t_local_hook
,
191 .owner
= THIS_MODULE
,
193 .hooknum
= NF_IP6_LOCAL_OUT
,
194 .priority
= NF_IP6_PRI_MANGLE
,
197 .hook
= ip6t_route_hook
,
198 .owner
= THIS_MODULE
,
200 .hooknum
= NF_IP6_POST_ROUTING
,
201 .priority
= NF_IP6_PRI_MANGLE
,
205 static int __init
ip6table_mangle_init(void)
210 ret
= ip6t_register_table(&packet_mangler
, &initial_table
.repl
);
215 ret
= nf_register_hooks(ip6t_ops
, ARRAY_SIZE(ip6t_ops
));
222 ip6t_unregister_table(&packet_mangler
);
226 static void __exit
ip6table_mangle_fini(void)
228 nf_unregister_hooks(ip6t_ops
, ARRAY_SIZE(ip6t_ops
));
229 ip6t_unregister_table(&packet_mangler
);
232 module_init(ip6table_mangle_init
);
233 module_exit(ip6table_mangle_fini
);
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