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Linux/net/ipv4/netfilter/iptable_filter.c

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  1 /*
  2  * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
  3  *
  4  * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
  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  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/moduleparam.h>
 15 #include <linux/netfilter_ipv4/ip_tables.h>
 16 #include <linux/slab.h>
 17 #include <net/ip.h>
 18 
 19 MODULE_LICENSE("GPL");
 20 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 21 MODULE_DESCRIPTION("iptables filter table");
 22 
 23 #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
 24                             (1 << NF_INET_FORWARD) | \
 25                             (1 << NF_INET_LOCAL_OUT))
 26 
 27 static const struct xt_table packet_filter = {
 28         .name           = "filter",
 29         .valid_hooks    = FILTER_VALID_HOOKS,
 30         .me             = THIS_MODULE,
 31         .af             = NFPROTO_IPV4,
 32         .priority       = NF_IP_PRI_FILTER,
 33 };
 34 
 35 static unsigned int
 36 iptable_filter_hook(unsigned int hook, struct sk_buff *skb,
 37                     const struct net_device *in, const struct net_device *out,
 38                     int (*okfn)(struct sk_buff *))
 39 {
 40         const struct net *net;
 41 
 42         if (hook == NF_INET_LOCAL_OUT &&
 43             (skb->len < sizeof(struct iphdr) ||
 44              ip_hdrlen(skb) < sizeof(struct iphdr)))
 45                 /* root is playing with raw sockets. */
 46                 return NF_ACCEPT;
 47 
 48         net = dev_net((in != NULL) ? in : out);
 49         return ipt_do_table(skb, hook, in, out, net->ipv4.iptable_filter);
 50 }
 51 
 52 static struct nf_hook_ops *filter_ops __read_mostly;
 53 
 54 /* Default to forward because I got too much mail already. */
 55 static bool forward = true;
 56 module_param(forward, bool, 0000);
 57 
 58 static int __net_init iptable_filter_net_init(struct net *net)
 59 {
 60         struct ipt_replace *repl;
 61 
 62         repl = ipt_alloc_initial_table(&packet_filter);
 63         if (repl == NULL)
 64                 return -ENOMEM;
 65         /* Entry 1 is the FORWARD hook */
 66         ((struct ipt_standard *)repl->entries)[1].target.verdict =
 67                 forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
 68 
 69         net->ipv4.iptable_filter =
 70                 ipt_register_table(net, &packet_filter, repl);
 71         kfree(repl);
 72         return PTR_RET(net->ipv4.iptable_filter);
 73 }
 74 
 75 static void __net_exit iptable_filter_net_exit(struct net *net)
 76 {
 77         ipt_unregister_table(net, net->ipv4.iptable_filter);
 78 }
 79 
 80 static struct pernet_operations iptable_filter_net_ops = {
 81         .init = iptable_filter_net_init,
 82         .exit = iptable_filter_net_exit,
 83 };
 84 
 85 static int __init iptable_filter_init(void)
 86 {
 87         int ret;
 88 
 89         ret = register_pernet_subsys(&iptable_filter_net_ops);
 90         if (ret < 0)
 91                 return ret;
 92 
 93         /* Register hooks */
 94         filter_ops = xt_hook_link(&packet_filter, iptable_filter_hook);
 95         if (IS_ERR(filter_ops)) {
 96                 ret = PTR_ERR(filter_ops);
 97                 unregister_pernet_subsys(&iptable_filter_net_ops);
 98         }
 99 
100         return ret;
101 }
102 
103 static void __exit iptable_filter_fini(void)
104 {
105         xt_hook_unlink(&packet_filter, filter_ops);
106         unregister_pernet_subsys(&iptable_filter_net_ops);
107 }
108 
109 module_init(iptable_filter_init);
110 module_exit(iptable_filter_fini);
111 

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