![Patrick McHardy](/assets/img/avatar_default.png)
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
199 lines
5.1 KiB
C
199 lines
5.1 KiB
C
/*
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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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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/netfilter_ipv6/ip6_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("ip6tables filter table");
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#define FILTER_VALID_HOOKS ((1 << NF_IP6_LOCAL_IN) | (1 << NF_IP6_FORWARD) | (1 << NF_IP6_LOCAL_OUT))
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/* Standard entry. */
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struct ip6t_standard
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{
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struct ip6t_entry entry;
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struct ip6t_standard_target target;
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};
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struct ip6t_error_target
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{
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struct ip6t_entry_target target;
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char errorname[IP6T_FUNCTION_MAXNAMELEN];
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};
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struct ip6t_error
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{
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struct ip6t_entry entry;
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struct ip6t_error_target target;
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};
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static struct
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{
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struct ip6t_replace repl;
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struct ip6t_standard entries[3];
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struct ip6t_error term;
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} initial_table __initdata
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= { { "filter", FILTER_VALID_HOOKS, 4,
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sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
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{ [NF_IP6_LOCAL_IN] = 0,
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[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
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[NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2 },
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{ [NF_IP6_LOCAL_IN] = 0,
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[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
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[NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_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 ip6t_entry),
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sizeof(struct ip6t_standard),
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0, { 0, 0 }, { } },
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{ { { { IP6T_ALIGN(sizeof(struct ip6t_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 ip6t_entry),
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sizeof(struct ip6t_standard),
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0, { 0, 0 }, { } },
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{ { { { IP6T_ALIGN(sizeof(struct ip6t_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 ip6t_entry),
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sizeof(struct ip6t_standard),
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0, { 0, 0 }, { } },
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{ { { { IP6T_ALIGN(sizeof(struct ip6t_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 ip6t_entry),
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sizeof(struct ip6t_error),
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0, { 0, 0 }, { } },
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{ { { { IP6T_ALIGN(sizeof(struct ip6t_error_target)), IP6T_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 ip6t_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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.me = THIS_MODULE,
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.af = AF_INET6,
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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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ip6t_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 ip6t_do_table(pskb, hook, in, out, &packet_filter);
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}
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static unsigned int
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ip6t_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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#if 0
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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("ip6t_hook: happy cracking.\n");
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return NF_ACCEPT;
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}
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#endif
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return ip6t_do_table(pskb, hook, in, out, &packet_filter);
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}
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static struct nf_hook_ops ip6t_ops[] = {
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{
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.hook = ip6t_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET6,
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.hooknum = NF_IP6_LOCAL_IN,
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.priority = NF_IP6_PRI_FILTER,
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},
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{
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.hook = ip6t_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET6,
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.hooknum = NF_IP6_FORWARD,
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.priority = NF_IP6_PRI_FILTER,
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},
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{
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.hook = ip6t_local_out_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET6,
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.hooknum = NF_IP6_LOCAL_OUT,
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.priority = NF_IP6_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 ip6table_filter_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 = ip6t_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_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
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if (ret < 0)
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goto cleanup_table;
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return ret;
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cleanup_table:
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ip6t_unregister_table(&packet_filter);
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return ret;
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}
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static void __exit ip6table_filter_fini(void)
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{
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nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
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ip6t_unregister_table(&packet_filter);
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}
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module_init(ip6table_filter_init);
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module_exit(ip6table_filter_fini);
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