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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 int __net_init ip6table_mangle_table_init(struct net *net);
 27 
 28 static const struct xt_table packet_mangler = {
 29         .name           = "mangle",
 30         .valid_hooks    = MANGLE_VALID_HOOKS,
 31         .me             = THIS_MODULE,
 32         .af             = NFPROTO_IPV6,
 33         .priority       = NF_IP6_PRI_MANGLE,
 34         .table_init     = ip6table_mangle_table_init,
 35 };
 36 
 37 static unsigned int
 38 ip6t_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
 39 {
 40         unsigned int ret;
 41         struct in6_addr saddr, daddr;
 42         u_int8_t hop_limit;
 43         u_int32_t flowlabel, mark;
 44         int err;
 45 
 46         /* save source/dest address, mark, hoplimit, flowlabel, priority,  */
 47         memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
 48         memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
 49         mark = skb->mark;
 50         hop_limit = ipv6_hdr(skb)->hop_limit;
 51 
 52         /* flowlabel and prio (includes version, which shouldn't change either */
 53         flowlabel = *((u_int32_t *)ipv6_hdr(skb));
 54 
 55         ret = ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
 56 
 57         if (ret != NF_DROP && ret != NF_STOLEN &&
 58             (!ipv6_addr_equal(&ipv6_hdr(skb)->saddr, &saddr) ||
 59              !ipv6_addr_equal(&ipv6_hdr(skb)->daddr, &daddr) ||
 60              skb->mark != mark ||
 61              ipv6_hdr(skb)->hop_limit != hop_limit ||
 62              flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
 63                 err = ip6_route_me_harder(state->net, skb);
 64                 if (err < 0)
 65                         ret = NF_DROP_ERR(err);
 66         }
 67 
 68         return ret;
 69 }
 70 
 71 /* The work comes in here from netfilter.c. */
 72 static unsigned int
 73 ip6table_mangle_hook(void *priv, struct sk_buff *skb,
 74                      const struct nf_hook_state *state)
 75 {
 76         if (state->hook == NF_INET_LOCAL_OUT)
 77                 return ip6t_mangle_out(skb, state);
 78         return ip6t_do_table(skb, state, state->net->ipv6.ip6table_mangle);
 79 }
 80 
 81 static struct nf_hook_ops *mangle_ops __read_mostly;
 82 static int __net_init ip6table_mangle_table_init(struct net *net)
 83 {
 84         struct ip6t_replace *repl;
 85         int ret;
 86 
 87         if (net->ipv6.ip6table_mangle)
 88                 return 0;
 89 
 90         repl = ip6t_alloc_initial_table(&packet_mangler);
 91         if (repl == NULL)
 92                 return -ENOMEM;
 93         ret = ip6t_register_table(net, &packet_mangler, repl, mangle_ops,
 94                                   &net->ipv6.ip6table_mangle);
 95         kfree(repl);
 96         return ret;
 97 }
 98 
 99 static void __net_exit ip6table_mangle_net_exit(struct net *net)
100 {
101         if (!net->ipv6.ip6table_mangle)
102                 return;
103 
104         ip6t_unregister_table(net, net->ipv6.ip6table_mangle, mangle_ops);
105         net->ipv6.ip6table_mangle = NULL;
106 }
107 
108 static struct pernet_operations ip6table_mangle_net_ops = {
109         .exit = ip6table_mangle_net_exit,
110 };
111 
112 static int __init ip6table_mangle_init(void)
113 {
114         int ret;
115 
116         mangle_ops = xt_hook_ops_alloc(&packet_mangler, ip6table_mangle_hook);
117         if (IS_ERR(mangle_ops))
118                 return PTR_ERR(mangle_ops);
119 
120         ret = register_pernet_subsys(&ip6table_mangle_net_ops);
121         if (ret < 0) {
122                 kfree(mangle_ops);
123                 return ret;
124         }
125 
126         ret = ip6table_mangle_table_init(&init_net);
127         if (ret) {
128                 unregister_pernet_subsys(&ip6table_mangle_net_ops);
129                 kfree(mangle_ops);
130         }
131         return ret;
132 }
133 
134 static void __exit ip6table_mangle_fini(void)
135 {
136         unregister_pernet_subsys(&ip6table_mangle_net_ops);
137         kfree(mangle_ops);
138 }
139 
140 module_init(ip6table_mangle_init);
141 module_exit(ip6table_mangle_fini);
142 

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