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 int __net_init ip6table_raw_table_init(struct net *net); 15 16 static bool raw_before_defrag __read_mostly; 17 MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag"); 18 module_param(raw_before_defrag, bool, 0000); 19 20 static const struct xt_table packet_raw = { 21 .name = "raw", 22 .valid_hooks = RAW_VALID_HOOKS, 23 .me = THIS_MODULE, 24 .af = NFPROTO_IPV6, 25 .priority = NF_IP6_PRI_RAW, 26 .table_init = ip6table_raw_table_init, 27 }; 28 29 static const struct xt_table packet_raw_before_defrag = { 30 .name = "raw", 31 .valid_hooks = RAW_VALID_HOOKS, 32 .me = THIS_MODULE, 33 .af = NFPROTO_IPV6, 34 .priority = NF_IP6_PRI_RAW_BEFORE_DEFRAG, 35 .table_init = ip6table_raw_table_init, 36 }; 37 38 /* The work comes in here from netfilter.c. */ 39 static unsigned int 40 ip6table_raw_hook(void *priv, struct sk_buff *skb, 41 const struct nf_hook_state *state) 42 { 43 return ip6t_do_table(skb, state, priv); 44 } 45 46 static struct nf_hook_ops *rawtable_ops __read_mostly; 47 48 static int __net_init ip6table_raw_table_init(struct net *net) 49 { 50 struct ip6t_replace *repl; 51 const struct xt_table *table = &packet_raw; 52 int ret; 53 54 if (raw_before_defrag) 55 table = &packet_raw_before_defrag; 56 57 repl = ip6t_alloc_initial_table(table); 58 if (repl == NULL) 59 return -ENOMEM; 60 ret = ip6t_register_table(net, table, repl, rawtable_ops); 61 kfree(repl); 62 return ret; 63 } 64 65 static void __net_exit ip6table_raw_net_pre_exit(struct net *net) 66 { 67 ip6t_unregister_table_pre_exit(net, "raw"); 68 } 69 70 static void __net_exit ip6table_raw_net_exit(struct net *net) 71 { 72 ip6t_unregister_table_exit(net, "raw"); 73 } 74 75 static struct pernet_operations ip6table_raw_net_ops = { 76 .pre_exit = ip6table_raw_net_pre_exit, 77 .exit = ip6table_raw_net_exit, 78 }; 79 80 static int __init ip6table_raw_init(void) 81 { 82 int ret; 83 const struct xt_table *table = &packet_raw; 84 85 if (raw_before_defrag) { 86 table = &packet_raw_before_defrag; 87 88 pr_info("Enabling raw table before defrag\n"); 89 } 90 91 /* Register hooks */ 92 rawtable_ops = xt_hook_ops_alloc(table, ip6table_raw_hook); 93 if (IS_ERR(rawtable_ops)) 94 return PTR_ERR(rawtable_ops); 95 96 ret = register_pernet_subsys(&ip6table_raw_net_ops); 97 if (ret < 0) { 98 kfree(rawtable_ops); 99 return ret; 100 } 101 102 ret = ip6table_raw_table_init(&init_net); 103 if (ret) { 104 unregister_pernet_subsys(&ip6table_raw_net_ops); 105 kfree(rawtable_ops); 106 } 107 return ret; 108 } 109 110 static void __exit ip6table_raw_fini(void) 111 { 112 unregister_pernet_subsys(&ip6table_raw_net_ops); 113 kfree(rawtable_ops); 114 } 115 116 module_init(ip6table_raw_init); 117 module_exit(ip6table_raw_fini); 118 MODULE_LICENSE("GPL"); 119