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#include <linux/module.h> 13#include <linux/moduleparam.h> 14#include <linux/netfilter_ipv6/ip6_tables.h> 15 16MODULE_LICENSE("GPL"); 17MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>"); 18MODULE_DESCRIPTION("ip6tables filter table"); 19 20#define FILTER_VALID_HOOKS ((1 << NF_IP6_LOCAL_IN) | (1 << NF_IP6_FORWARD) | (1 << NF_IP6_LOCAL_OUT)) 21 22static struct 23{ 24 struct ip6t_replace repl; 25 struct ip6t_standard entries[3]; 26 struct ip6t_error term; 27} initial_table __initdata = { 28 .repl = { 29 .name = "filter", 30 .valid_hooks = FILTER_VALID_HOOKS, 31 .num_entries = 4, 32 .size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error), 33 .hook_entry = { 34 [NF_IP6_LOCAL_IN] = 0, 35 [NF_IP6_FORWARD] = sizeof(struct ip6t_standard), 36 [NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2 37 }, 38 .underflow = { 39 [NF_IP6_LOCAL_IN] = 0, 40 [NF_IP6_FORWARD] = sizeof(struct ip6t_standard), 41 [NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2 42 }, 43 }, 44 .entries = { 45 IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */ 46 IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */ 47 IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */ 48 }, 49 .term = IP6T_ERROR_INIT, /* ERROR */ 50}; 51 52static struct xt_table packet_filter = { 53 .name = "filter", 54 .valid_hooks = FILTER_VALID_HOOKS, 55 .lock = RW_LOCK_UNLOCKED, 56 .me = THIS_MODULE, 57 .af = AF_INET6, 58}; 59 60/* The work comes in here from netfilter.c. */ 61static unsigned int 62ip6t_hook(unsigned int hook, 63 struct sk_buff **pskb, 64 const struct net_device *in, 65 const struct net_device *out, 66 int (*okfn)(struct sk_buff *)) 67{ 68 return ip6t_do_table(pskb, hook, in, out, &packet_filter); 69} 70 71static unsigned int 72ip6t_local_out_hook(unsigned int hook, 73 struct sk_buff **pskb, 74 const struct net_device *in, 75 const struct net_device *out, 76 int (*okfn)(struct sk_buff *)) 77{ 78 79 return ip6t_do_table(pskb, hook, in, out, &packet_filter); 80} 81 82static struct nf_hook_ops ip6t_ops[] = { 83 { 84 .hook = ip6t_hook, 85 .owner = THIS_MODULE, 86 .pf = PF_INET6, 87 .hooknum = NF_IP6_LOCAL_IN, 88 .priority = NF_IP6_PRI_FILTER, 89 }, 90 { 91 .hook = ip6t_hook, 92 .owner = THIS_MODULE, 93 .pf = PF_INET6, 94 .hooknum = NF_IP6_FORWARD, 95 .priority = NF_IP6_PRI_FILTER, 96 }, 97 { 98 .hook = ip6t_local_out_hook, 99 .owner = THIS_MODULE, 100 .pf = PF_INET6, 101 .hooknum = NF_IP6_LOCAL_OUT, 102 .priority = NF_IP6_PRI_FILTER, 103 }, 104}; 105 106/* Default to forward because I got too much mail already. */ 107static int forward = NF_ACCEPT; 108module_param(forward, bool, 0000); 109 110static int __init ip6table_filter_init(void) 111{ 112 int ret; 113 114 if (forward < 0 || forward > NF_MAX_VERDICT) { 115 printk("iptables forward must be 0 or 1\n"); 116 return -EINVAL; 117 } 118 119 /* Entry 1 is the FORWARD hook */ 120 initial_table.entries[1].target.verdict = -forward - 1; 121 122 /* Register table */ 123 ret = ip6t_register_table(&packet_filter, &initial_table.repl); 124 if (ret < 0) 125 return ret; 126 127 /* Register hooks */ 128 ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops)); 129 if (ret < 0) 130 goto cleanup_table; 131 132 return ret; 133 134 cleanup_table: 135 ip6t_unregister_table(&packet_filter); 136 return ret; 137} 138 139static void __exit ip6table_filter_fini(void) 140{ 141 nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops)); 142 ip6t_unregister_table(&packet_filter); 143} 144 145module_init(ip6table_filter_init); 146module_exit(ip6table_filter_fini); 147