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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 #include <linux/slab.h>
 14 #include <net/ipv6.h>
 15 
 16 MODULE_LICENSE("GPL");
 17 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 18 MODULE_DESCRIPTION("ip6tables mangle table");
 19 
 20 #define MANGLE_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | \
 21                             (1 << NF_INET_LOCAL_IN) | \
 22                             (1 << NF_INET_FORWARD) | \
 23                             (1 << NF_INET_LOCAL_OUT) | \
 24                             (1 << NF_INET_POST_ROUTING))
 25 
 26 static const struct xt_table packet_mangler = {
 27         .name           = "mangle",
 28         .valid_hooks    = MANGLE_VALID_HOOKS,
 29         .me             = THIS_MODULE,
 30         .af             = NFPROTO_IPV6,
 31         .priority       = NF_IP6_PRI_MANGLE,
 32 };
 33 
 34 static unsigned int
 35 ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
 36 {
 37         unsigned int ret;
 38         struct in6_addr saddr, daddr;
 39         u_int8_t hop_limit;
 40         u_int32_t flowlabel, mark;
 41         int err;
 42 #if 0
 43         /* root is playing with raw sockets. */
 44         if (skb->len < sizeof(struct iphdr) ||
 45             ip_hdrlen(skb) < sizeof(struct iphdr)) {
 46                 net_warn_ratelimited("ip6t_hook: happy cracking\n");
 47                 return NF_ACCEPT;
 48         }
 49 #endif
 50 
 51         /* save source/dest address, mark, hoplimit, flowlabel, priority,  */
 52         memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
 53         memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
 54         mark = skb->mark;
 55         hop_limit = ipv6_hdr(skb)->hop_limit;
 56 
 57         /* flowlabel and prio (includes version, which shouldn't change either */
 58         flowlabel = *((u_int32_t *)ipv6_hdr(skb));
 59 
 60         ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
 61 
 62         if (ret != NF_DROP && ret != NF_STOLEN &&
 63             (!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
 64              !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
 65              skb->mark != mark ||
 66              ipv6_hdr(skb)->hop_limit != hop_limit ||
 67              flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
 68                 err = ip6_route_me_harder(state->net, skb);
 69                 if (err < 0)
 70                         ret = NF_DROP_ERR(err);
 71         }
 72 
 73         return ret;
 74 }
 75 
 76 /* The work comes in here from netfilter.c. */
 77 static unsigned int
 78 ip6table_mangle_hook(void *priv, struct sk_buff *skb,
 79                      const struct nf_hook_state *state)
 80 {
 81         if (state->hook == NF_INET_LOCAL_OUT)
 82                 return ip6t_mangle_out(skb, state);
 83         if (state->hook == NF_INET_POST_ROUTING)
 84                 return ip6t_do_table(skb, state,
 85                                      state->net->ipv6.ip6table_mangle);
 86         /* INPUT/FORWARD */
 87         return ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
 88 }
 89 
 90 static struct nf_hook_ops *mangle_ops __read_mostly;
 91 static int __net_init ip6table_mangle_net_init(struct net *net)
 92 {
 93         struct ip6t_replace *repl;
 94 
 95         repl = ip6t_alloc_initial_table(&packet_mangler);
 96         if (repl == NULL)
 97                 return -ENOMEM;
 98         net->ipv6.ip6table_mangle =
 99                 ip6t_register_table(net, &packet_mangler, repl);
100         kfree(repl);
101         return PTR_ERR_OR_ZERO(net->ipv6.ip6table_mangle);
102 }
103 
104 static void __net_exit ip6table_mangle_net_exit(struct net *net)
105 {
106         ip6t_unregister_table(net, net->ipv6.ip6table_mangle);
107 }
108 
109 static struct pernet_operations ip6table_mangle_net_ops = {
110         .init = ip6table_mangle_net_init,
111         .exit = ip6table_mangle_net_exit,
112 };
113 
114 static int __init ip6table_mangle_init(void)
115 {
116         int ret;
117 
118         ret = register_pernet_subsys(&ip6table_mangle_net_ops);
119         if (ret < 0)
120                 return ret;
121 
122         /* Register hooks */
123         mangle_ops = xt_hook_link(&packet_mangler, ip6table_mangle_hook);
124         if (IS_ERR(mangle_ops)) {
125                 ret = PTR_ERR(mangle_ops);
126                 goto cleanup_table;
127         }
128 
129         return ret;
130 
131  cleanup_table:
132         unregister_pernet_subsys(&ip6table_mangle_net_ops);
133         return ret;
134 }
135 
136 static void __exit ip6table_mangle_fini(void)
137 {
138         xt_hook_unlink(&packet_mangler, mangle_ops);
139         unregister_pernet_subsys(&ip6table_mangle_net_ops);
140 }
141 
142 module_init(ip6table_mangle_init);
143 module_exit(ip6table_mangle_fini);
144 

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