2005-04-16 22:20:36 +00:00
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/*
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* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
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*
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* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
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* Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("iptables filter table");
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#define FILTER_VALID_HOOKS ((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | (1 << NF_IP_LOCAL_OUT))
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static struct
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{
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struct ipt_replace repl;
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struct ipt_standard entries[3];
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struct ipt_error term;
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} initial_table __initdata
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= { { "filter", FILTER_VALID_HOOKS, 4,
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sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
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{ [NF_IP_LOCAL_IN] = 0,
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[NF_IP_FORWARD] = sizeof(struct ipt_standard),
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[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
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{ [NF_IP_LOCAL_IN] = 0,
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[NF_IP_FORWARD] = sizeof(struct ipt_standard),
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[NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) * 2 },
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0, NULL, { } },
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{
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/* LOCAL_IN */
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{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
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0,
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sizeof(struct ipt_entry),
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sizeof(struct ipt_standard),
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0, { 0, 0 }, { } },
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{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 } },
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/* FORWARD */
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{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
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0,
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sizeof(struct ipt_entry),
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sizeof(struct ipt_standard),
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0, { 0, 0 }, { } },
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{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 } },
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/* LOCAL_OUT */
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{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
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0,
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sizeof(struct ipt_entry),
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sizeof(struct ipt_standard),
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0, { 0, 0 }, { } },
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{ { { { IPT_ALIGN(sizeof(struct ipt_standard_target)), "" } }, { } },
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-NF_ACCEPT - 1 } }
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},
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/* ERROR */
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{ { { { 0 }, { 0 }, { 0 }, { 0 }, "", "", { 0 }, { 0 }, 0, 0, 0 },
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0,
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sizeof(struct ipt_entry),
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sizeof(struct ipt_error),
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0, { 0, 0 }, { } },
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{ { { { IPT_ALIGN(sizeof(struct ipt_error_target)), IPT_ERROR_TARGET } },
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{ } },
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"ERROR"
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}
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}
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};
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static struct ipt_table packet_filter = {
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.name = "filter",
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.valid_hooks = FILTER_VALID_HOOKS,
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.lock = RW_LOCK_UNLOCKED,
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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.me = THIS_MODULE,
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.af = AF_INET,
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2005-04-16 22:20:36 +00:00
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};
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/* The work comes in here from netfilter.c. */
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static unsigned int
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ipt_hook(unsigned int hook,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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return ipt_do_table(pskb, hook, in, out, &packet_filter, NULL);
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}
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static unsigned int
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ipt_local_out_hook(unsigned int hook,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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/* root is playing with raw sockets. */
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if ((*pskb)->len < sizeof(struct iphdr)
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|| (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
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if (net_ratelimit())
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printk("ipt_hook: happy cracking.\n");
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return NF_ACCEPT;
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}
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return ipt_do_table(pskb, hook, in, out, &packet_filter, NULL);
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}
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static struct nf_hook_ops ipt_ops[] = {
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{
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.hook = ipt_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_IN,
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.priority = NF_IP_PRI_FILTER,
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},
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{
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.hook = ipt_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_FORWARD,
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.priority = NF_IP_PRI_FILTER,
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},
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{
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.hook = ipt_local_out_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_LOCAL_OUT,
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.priority = NF_IP_PRI_FILTER,
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},
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};
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/* Default to forward because I got too much mail already. */
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static int forward = NF_ACCEPT;
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module_param(forward, bool, 0000);
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static int __init init(void)
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{
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int ret;
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if (forward < 0 || forward > NF_MAX_VERDICT) {
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printk("iptables forward must be 0 or 1\n");
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return -EINVAL;
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}
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/* Entry 1 is the FORWARD hook */
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initial_table.entries[1].target.verdict = -forward - 1;
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/* Register table */
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ret = ipt_register_table(&packet_filter, &initial_table.repl);
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if (ret < 0)
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return ret;
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/* Register hooks */
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ret = nf_register_hook(&ipt_ops[0]);
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if (ret < 0)
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goto cleanup_table;
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ret = nf_register_hook(&ipt_ops[1]);
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if (ret < 0)
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goto cleanup_hook0;
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ret = nf_register_hook(&ipt_ops[2]);
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if (ret < 0)
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goto cleanup_hook1;
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return ret;
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cleanup_hook1:
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nf_unregister_hook(&ipt_ops[1]);
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cleanup_hook0:
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nf_unregister_hook(&ipt_ops[0]);
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cleanup_table:
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ipt_unregister_table(&packet_filter);
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return ret;
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}
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static void __exit fini(void)
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{
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unsigned int i;
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for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++)
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nf_unregister_hook(&ipt_ops[i]);
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ipt_unregister_table(&packet_filter);
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}
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module_init(init);
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module_exit(fini);
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