ipv6/netfilter/ip6table_raw.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * IPv6 raw table, a port of the IPv4 raw table to IPv6
0004  *
0005  * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@netfilter.org>
0006  */
0007 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0008 #include <linux/module.h>
0009 #include <linux/netfilter_ipv6/ip6_tables.h>
0010 #include <linux/slab.h>
0011
0012 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
0013
0014 static bool raw_before_defrag __read_mostly;
0015 MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
0016 module_param(raw_before_defrag, bool, 0000);
0017
0018 static const struct xt_table packet_raw = {
0019     .name = "raw",
0020     .valid_hooks = RAW_VALID_HOOKS,
0021     .me = THIS_MODULE,
0022     .af = NFPROTO_IPV6,
0023     .priority = NF_IP6_PRI_RAW,
0024 };
0025
0026 static const struct xt_table packet_raw_before_defrag = {
0027     .name = "raw",
0028     .valid_hooks = RAW_VALID_HOOKS,
0029     .me = THIS_MODULE,
0030     .af = NFPROTO_IPV6,
0031     .priority = NF_IP6_PRI_RAW_BEFORE_DEFRAG,
0032 };
0033
0034 static struct nf_hook_ops *rawtable_ops __read_mostly;
0035
0036 static int ip6table_raw_table_init(struct net *net)
0037 {
0038     struct ip6t_replace *repl;
0039     const struct xt_table *table = &packet_raw;
0040     int ret;
0041
0042     if (raw_before_defrag)
0043         table = &packet_raw_before_defrag;
0044
0045     repl = ip6t_alloc_initial_table(table);
0046     if (repl == NULL)
0047         return -ENOMEM;
0048     ret = ip6t_register_table(net, table, repl, rawtable_ops);
0049     kfree(repl);
0050     return ret;
0051 }
0052
0053 static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
0054 {
0055     ip6t_unregister_table_pre_exit(net, "raw");
0056 }
0057
0058 static void __net_exit ip6table_raw_net_exit(struct net *net)
0059 {
0060     ip6t_unregister_table_exit(net, "raw");
0061 }
0062
0063 static struct pernet_operations ip6table_raw_net_ops = {
0064     .pre_exit = ip6table_raw_net_pre_exit,
0065     .exit = ip6table_raw_net_exit,
0066 };
0067
0068 static int __init ip6table_raw_init(void)
0069 {
0070     const struct xt_table *table = &packet_raw;
0071     int ret;
0072
0073     if (raw_before_defrag) {
0074         table = &packet_raw_before_defrag;
0075         pr_info("Enabling raw table before defrag\n");
0076     }
0077
0078     ret = xt_register_template(table, ip6table_raw_table_init);
0079     if (ret < 0)
0080         return ret;
0081
0082     /* Register hooks */
0083     rawtable_ops = xt_hook_ops_alloc(table, ip6t_do_table);
0084     if (IS_ERR(rawtable_ops)) {
0085         xt_unregister_template(table);
0086         return PTR_ERR(rawtable_ops);
0087     }
0088
0089     ret = register_pernet_subsys(&ip6table_raw_net_ops);
0090     if (ret < 0) {
0091         kfree(rawtable_ops);
0092         xt_unregister_template(table);
0093         return ret;
0094     }
0095
0096     return ret;
0097 }
0098
0099 static void __exit ip6table_raw_fini(void)
0100 {
0101     unregister_pernet_subsys(&ip6table_raw_net_ops);
0102     xt_unregister_template(&packet_raw);
0103     kfree(rawtable_ops);
0104 }
0105
0106 module_init(ip6table_raw_init);
0107 module_exit(ip6table_raw_fini);
0108 MODULE_LICENSE("GPL");