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, state->net->ipv6.ip6table_raw); 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 if (net->ipv6.ip6table_raw) 58 return 0; 59 60 repl = ip6t_alloc_initial_table(table); 61 if (repl == NULL) 62 return -ENOMEM; 63 ret = ip6t_register_table(net, table, repl, rawtable_ops, 64 &net->ipv6.ip6table_raw); 65 kfree(repl); 66 return ret; 67 } 68 69 static void __net_exit ip6table_raw_net_exit(struct net *net) 70 { 71 if (!net->ipv6.ip6table_raw) 72 return; 73 ip6t_unregister_table(net, net->ipv6.ip6table_raw, rawtable_ops); 74 net->ipv6.ip6table_raw = NULL; 75 } 76 77 static struct pernet_operations ip6table_raw_net_ops = { 78 .exit = ip6table_raw_net_exit, 79 }; 80 81 static int __init ip6table_raw_init(void) 82 { 83 int ret; 84 const struct xt_table *table = &packet_raw; 85 86 if (raw_before_defrag) { 87 table = &packet_raw_before_defrag; 88 89 pr_info("Enabling raw table before defrag\n"); 90 } 91 92 /* Register hooks */ 93 rawtable_ops = xt_hook_ops_alloc(table, ip6table_raw_hook); 94 if (IS_ERR(rawtable_ops)) 95 return PTR_ERR(rawtable_ops); 96 97 ret = register_pernet_subsys(&ip6table_raw_net_ops); 98 if (ret < 0) { 99 kfree(rawtable_ops); 100 return ret; 101 } 102 103 ret = ip6table_raw_table_init(&init_net); 104 if (ret) { 105 unregister_pernet_subsys(&ip6table_raw_net_ops); 106 kfree(rawtable_ops); 107 } 108 return ret; 109 } 110 111 static void __exit ip6table_raw_fini(void) 112 { 113 unregister_pernet_subsys(&ip6table_raw_net_ops); 114 kfree(rawtable_ops); 115 } 116 117 module_init(ip6table_raw_init); 118 module_exit(ip6table_raw_fini); 119 MODULE_LICENSE("GPL"); 120