1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IPv6 raw table, a port of the IPv4 raw table to IPv6 4 * 5 * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org> 6 */ 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 #include <linux/module.h> 9 #include <linux/netfilter_ipv6/ip6_tables.h> 10 #include <linux/slab.h> 11 12 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT)) 13 14 static bool raw_before_defrag __read_mostly; 15 MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag"); 16 module_param(raw_before_defrag, bool, 0000); 17 18 static const struct xt_table packet_raw = { 19 .name = "raw", 20 .valid_hooks = RAW_VALID_HOOKS, 21 .me = THIS_MODULE, 22 .af = NFPROTO_IPV6, 23 .priority = NF_IP6_PRI_RAW, 24 }; 25 26 static const struct xt_table packet_raw_before_defrag = { 27 .name = "raw", 28 .valid_hooks = RAW_VALID_HOOKS, 29 .me = THIS_MODULE, 30 .af = NFPROTO_IPV6, 31 .priority = NF_IP6_PRI_RAW_BEFORE_DEFRAG, 32 }; 33 34 static struct nf_hook_ops *rawtable_ops __read_mostly; 35 36 static int ip6table_raw_table_init(struct net *net) 37 { 38 struct ip6t_replace *repl; 39 const struct xt_table *table = &packet_raw; 40 int ret; 41 42 if (raw_before_defrag) 43 table = &packet_raw_before_defrag; 44 45 repl = ip6t_alloc_initial_table(table); 46 if (repl == NULL) 47 return -ENOMEM; 48 ret = ip6t_register_table(net, table, repl, rawtable_ops); 49 kfree(repl); 50 return ret; 51 } 52 53 static void __net_exit ip6table_raw_net_pre_exit(struct net *net) 54 { 55 ip6t_unregister_table_pre_exit(net, "raw"); 56 } 57 58 static void __net_exit ip6table_raw_net_exit(struct net *net) 59 { 60 ip6t_unregister_table_exit(net, "raw"); 61 } 62 63 static struct pernet_operations ip6table_raw_net_ops = { 64 .pre_exit = ip6table_raw_net_pre_exit, 65 .exit = ip6table_raw_net_exit, 66 }; 67 68 static int __init ip6table_raw_init(void) 69 { 70 const struct xt_table *table = &packet_raw; 71 int ret; 72 73 if (raw_before_defrag) { 74 table = &packet_raw_before_defrag; 75 pr_info("Enabling raw table before defrag\n"); 76 } 77 78 ret = xt_register_template(table, ip6table_raw_table_init); 79 if (ret < 0) 80 return ret; 81 82 /* Register hooks */ 83 rawtable_ops = xt_hook_ops_alloc(table, ip6t_do_table); 84 if (IS_ERR(rawtable_ops)) { 85 xt_unregister_template(table); 86 return PTR_ERR(rawtable_ops); 87 } 88 89 ret = register_pernet_subsys(&ip6table_raw_net_ops); 90 if (ret < 0) { 91 kfree(rawtable_ops); 92 xt_unregister_template(table); 93 return ret; 94 } 95 96 return ret; 97 } 98 99 static void __exit ip6table_raw_fini(void) 100 { 101 unregister_pernet_subsys(&ip6table_raw_net_ops); 102 xt_unregister_template(&packet_raw); 103 kfree(rawtable_ops); 104 } 105 106 module_init(ip6table_raw_init); 107 module_exit(ip6table_raw_fini); 108 MODULE_LICENSE("GPL"); 109