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Linux/net/ipv6/netfilter/ip6table_mangle.c

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  1 /*
  2  * IPv6 packet mangling table, a port of the IPv4 mangle table to IPv6
  3  *
  4  * Copyright (C) 2000-2001 by Harald Welte <laforge@gnumonks.org>
  5  * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
  6  *
  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.
 10  */
 11 #include <linux/module.h>
 12 #include <linux/netfilter_ipv6/ip6_tables.h>
 13 
 14 MODULE_LICENSE("GPL");
 15 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 16 MODULE_DESCRIPTION("ip6tables mangle table");
 17 
 18 #define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
 19                             (1 << NF_INET_LOCAL_IN) | \
 20                             (1 << NF_INET_FORWARD) | \
 21                             (1 << NF_INET_LOCAL_OUT) | \
 22                             (1 << NF_INET_POST_ROUTING))
 23 
 24 static const struct
 25 {
 26         struct ip6t_replace repl;
 27         struct ip6t_standard entries[5];
 28         struct ip6t_error term;
 29 } initial_table __net_initdata = {
 30         .repl = {
 31                 .name = "mangle",
 32                 .valid_hooks = MANGLE_VALID_HOOKS,
 33                 .num_entries = 6,
 34                 .size = sizeof(struct ip6t_standard) * 5 + sizeof(struct ip6t_error),
 35                 .hook_entry = {
 36                         [NF_INET_PRE_ROUTING]   = 0,
 37                         [NF_INET_LOCAL_IN]      = sizeof(struct ip6t_standard),
 38                         [NF_INET_FORWARD]       = sizeof(struct ip6t_standard) * 2,
 39                         [NF_INET_LOCAL_OUT]     = sizeof(struct ip6t_standard) * 3,
 40                         [NF_INET_POST_ROUTING]  = sizeof(struct ip6t_standard) * 4,
 41                 },
 42                 .underflow = {
 43                         [NF_INET_PRE_ROUTING]   = 0,
 44                         [NF_INET_LOCAL_IN]      = sizeof(struct ip6t_standard),
 45                         [NF_INET_FORWARD]       = sizeof(struct ip6t_standard) * 2,
 46                         [NF_INET_LOCAL_OUT]     = sizeof(struct ip6t_standard) * 3,
 47                         [NF_INET_POST_ROUTING]  = sizeof(struct ip6t_standard) * 4,
 48                 },
 49         },
 50         .entries = {
 51                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* PRE_ROUTING */
 52                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_IN */
 53                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* FORWARD */
 54                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_OUT */
 55                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* POST_ROUTING */
 56         },
 57         .term = IP6T_ERROR_INIT,                /* ERROR */
 58 };
 59 
 60 static const struct xt_table packet_mangler = {
 61         .name           = "mangle",
 62         .valid_hooks    = MANGLE_VALID_HOOKS,
 63         .me             = THIS_MODULE,
 64         .af             = NFPROTO_IPV6,
 65 };
 66 
 67 /* The work comes in here from netfilter.c. */
 68 static unsigned int
 69 ip6t_in_hook(unsigned int hook,
 70          struct sk_buff *skb,
 71          const struct net_device *in,
 72          const struct net_device *out,
 73          int (*okfn)(struct sk_buff *))
 74 {
 75         return ip6t_do_table(skb, hook, in, out,
 76                              dev_net(in)->ipv6.ip6table_mangle);
 77 }
 78 
 79 static unsigned int
 80 ip6t_post_routing_hook(unsigned int hook,
 81                 struct sk_buff *skb,
 82                 const struct net_device *in,
 83                 const struct net_device *out,
 84                 int (*okfn)(struct sk_buff *))
 85 {
 86         return ip6t_do_table(skb, hook, in, out,
 87                              dev_net(out)->ipv6.ip6table_mangle);
 88 }
 89 
 90 static unsigned int
 91 ip6t_local_out_hook(unsigned int hook,
 92                    struct sk_buff *skb,
 93                    const struct net_device *in,
 94                    const struct net_device *out,
 95                    int (*okfn)(struct sk_buff *))
 96 {
 97 
 98         unsigned int ret;
 99         struct in6_addr saddr, daddr;
100         u_int8_t hop_limit;
101         u_int32_t flowlabel, mark;
102 
103 #if 0
104         /* root is playing with raw sockets. */
105         if (skb->len < sizeof(struct iphdr)
106             || ip_hdrlen(skb) < sizeof(struct iphdr)) {
107                 if (net_ratelimit())
108                         printk("ip6t_hook: happy cracking.\n");
109                 return NF_ACCEPT;
110         }
111 #endif
112 
113         /* save source/dest address, mark, hoplimit, flowlabel, priority,  */
114         memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
115         memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
116         mark = skb->mark;
117         hop_limit = ipv6_hdr(skb)->hop_limit;
118 
119         /* flowlabel and prio (includes version, which shouldn't change either */
120         flowlabel = *((u_int32_t *)ipv6_hdr(skb));
121 
122         ret = ip6t_do_table(skb, hook, in, out,
123                             dev_net(out)->ipv6.ip6table_mangle);
124 
125         if (ret != NF_DROP && ret != NF_STOLEN
126                 && (memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr))
127                     || memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr))
128                     || skb->mark != mark
129                     || ipv6_hdr(skb)->hop_limit != hop_limit))
130                 return ip6_route_me_harder(skb) == 0 ? ret : NF_DROP;
131 
132         return ret;
133 }
134 
135 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
136         {
137                 .hook           = ip6t_in_hook,
138                 .owner          = THIS_MODULE,
139                 .pf             = NFPROTO_IPV6,
140                 .hooknum        = NF_INET_PRE_ROUTING,
141                 .priority       = NF_IP6_PRI_MANGLE,
142         },
143         {
144                 .hook           = ip6t_in_hook,
145                 .owner          = THIS_MODULE,
146                 .pf             = NFPROTO_IPV6,
147                 .hooknum        = NF_INET_LOCAL_IN,
148                 .priority       = NF_IP6_PRI_MANGLE,
149         },
150         {
151                 .hook           = ip6t_in_hook,
152                 .owner          = THIS_MODULE,
153                 .pf             = NFPROTO_IPV6,
154                 .hooknum        = NF_INET_FORWARD,
155                 .priority       = NF_IP6_PRI_MANGLE,
156         },
157         {
158                 .hook           = ip6t_local_out_hook,
159                 .owner          = THIS_MODULE,
160                 .pf             = NFPROTO_IPV6,
161                 .hooknum        = NF_INET_LOCAL_OUT,
162                 .priority       = NF_IP6_PRI_MANGLE,
163         },
164         {
165                 .hook           = ip6t_post_routing_hook,
166                 .owner          = THIS_MODULE,
167                 .pf             = NFPROTO_IPV6,
168                 .hooknum        = NF_INET_POST_ROUTING,
169                 .priority       = NF_IP6_PRI_MANGLE,
170         },
171 };
172 
173 static int __net_init ip6table_mangle_net_init(struct net *net)
174 {
175         /* Register table */
176         net->ipv6.ip6table_mangle =
177                 ip6t_register_table(net, &packet_mangler, &initial_table.repl);
178         if (IS_ERR(net->ipv6.ip6table_mangle))
179                 return PTR_ERR(net->ipv6.ip6table_mangle);
180         return 0;
181 }
182 
183 static void __net_exit ip6table_mangle_net_exit(struct net *net)
184 {
185         ip6t_unregister_table(net->ipv6.ip6table_mangle);
186 }
187 
188 static struct pernet_operations ip6table_mangle_net_ops = {
189         .init = ip6table_mangle_net_init,
190         .exit = ip6table_mangle_net_exit,
191 };
192 
193 static int __init ip6table_mangle_init(void)
194 {
195         int ret;
196 
197         ret = register_pernet_subsys(&ip6table_mangle_net_ops);
198         if (ret < 0)
199                 return ret;
200 
201         /* Register hooks */
202         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
203         if (ret < 0)
204                 goto cleanup_table;
205 
206         return ret;
207 
208  cleanup_table:
209         unregister_pernet_subsys(&ip6table_mangle_net_ops);
210         return ret;
211 }
212 
213 static void __exit ip6table_mangle_fini(void)
214 {
215         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
216         unregister_pernet_subsys(&ip6table_mangle_net_ops);
217 }
218 
219 module_init(ip6table_mangle_init);
220 module_exit(ip6table_mangle_fini);
221 

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