LXR linux/net/ipv6/netfilter/ip6table

   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
  14static bool raw_before_defrag __read_mostly;
  15MODULE_PARM_DESC(raw_before_defrag, "Enable raw table before defrag");
  16module_param(raw_before_defrag, bool, 0000);
  17
  18static 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
  26static 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/* The work comes in here from netfilter.c. */
  35static unsigned int
  36ip6table_raw_hook(void *priv, struct sk_buff *skb,
  37                  const struct nf_hook_state *state)
  38{
  39        return ip6t_do_table(skb, state, priv);
  40}
  41
  42static struct nf_hook_ops *rawtable_ops __read_mostly;
  43
  44static int ip6table_raw_table_init(struct net *net)
  45{
  46        struct ip6t_replace *repl;
  47        const struct xt_table *table = &packet_raw;
  48        int ret;
  49
  50        if (raw_before_defrag)
  51                table = &packet_raw_before_defrag;
  52
  53        repl = ip6t_alloc_initial_table(table);
  54        if (repl == NULL)
  55                return -ENOMEM;
  56        ret = ip6t_register_table(net, table, repl, rawtable_ops);
  57        kfree(repl);
  58        return ret;
  59}
  60
  61static void __net_exit ip6table_raw_net_pre_exit(struct net *net)
  62{
  63        ip6t_unregister_table_pre_exit(net, "raw");
  64}
  65
  66static void __net_exit ip6table_raw_net_exit(struct net *net)
  67{
  68        ip6t_unregister_table_exit(net, "raw");
  69}
  70
  71static struct pernet_operations ip6table_raw_net_ops = {
  72        .pre_exit = ip6table_raw_net_pre_exit,
  73        .exit = ip6table_raw_net_exit,
  74};
  75
  76static int __init ip6table_raw_init(void)
  77{
  78        const struct xt_table *table = &packet_raw;
  79        int ret;
  80
  81        if (raw_before_defrag) {
  82                table = &packet_raw_before_defrag;
  83                pr_info("Enabling raw table before defrag\n");
  84        }
  85
  86        ret = xt_register_template(table, ip6table_raw_table_init);
  87        if (ret < 0)
  88                return ret;
  89
  90        /* Register hooks */
  91        rawtable_ops = xt_hook_ops_alloc(table, ip6table_raw_hook);
  92        if (IS_ERR(rawtable_ops)) {
  93                xt_unregister_template(table);
  94                return PTR_ERR(rawtable_ops);
  95        }
  96
  97        ret = register_pernet_subsys(&ip6table_raw_net_ops);
  98        if (ret < 0) {
  99                kfree(rawtable_ops);
 100                xt_unregister_template(table);
 101                return ret;
 102        }
 103
 104        return ret;
 105}
 106
 107static void __exit ip6table_raw_fini(void)
 108{
 109        unregister_pernet_subsys(&ip6table_raw_net_ops);
 110        xt_unregister_template(&packet_raw);
 111        kfree(rawtable_ops);
 112}
 113
 114module_init(ip6table_raw_init);
 115module_exit(ip6table_raw_fini);
 116MODULE_LICENSE("GPL");
 117