LXR linux/net/netfilter/xt

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (c) 2003+ Evgeniy Polyakov <zbr@ioremap.net>
   4 */
   5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6#include <linux/module.h>
   7#include <linux/kernel.h>
   8
   9#include <linux/capability.h>
  10#include <linux/if.h>
  11#include <linux/inetdevice.h>
  12#include <linux/ip.h>
  13#include <linux/list.h>
  14#include <linux/rculist.h>
  15#include <linux/skbuff.h>
  16#include <linux/slab.h>
  17#include <linux/tcp.h>
  18
  19#include <net/ip.h>
  20#include <net/tcp.h>
  21
  22#include <linux/netfilter/nfnetlink.h>
  23#include <linux/netfilter/x_tables.h>
  24#include <net/netfilter/nf_log.h>
  25#include <linux/netfilter/xt_osf.h>
  26
  27static bool
  28xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
  29{
  30        return nf_osf_match(skb, xt_family(p), xt_hooknum(p), xt_in(p),
  31                            xt_out(p), p->matchinfo, xt_net(p), nf_osf_fingers);
  32}
  33
  34static struct xt_match xt_osf_match = {
  35        .name           = "osf",
  36        .revision       = 0,
  37        .family         = NFPROTO_IPV4,
  38        .proto          = IPPROTO_TCP,
  39        .hooks          = (1 << NF_INET_LOCAL_IN) |
  40                                (1 << NF_INET_PRE_ROUTING) |
  41                                (1 << NF_INET_FORWARD),
  42        .match          = xt_osf_match_packet,
  43        .matchsize      = sizeof(struct xt_osf_info),
  44        .me             = THIS_MODULE,
  45};
  46
  47static int __init xt_osf_init(void)
  48{
  49        int err;
  50
  51        err = xt_register_match(&xt_osf_match);
  52        if (err) {
  53                pr_err("Failed to register OS fingerprint "
  54                       "matching module (%d)\n", err);
  55                return err;
  56        }
  57
  58        return 0;
  59}
  60
  61static void __exit xt_osf_fini(void)
  62{
  63        xt_unregister_match(&xt_osf_match);
  64}
  65
  66module_init(xt_osf_init);
  67module_exit(xt_osf_fini);
  68
  69MODULE_LICENSE("GPL");
  70MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
  71MODULE_DESCRIPTION("Passive OS fingerprint matching.");
  72MODULE_ALIAS("ipt_osf");
  73MODULE_ALIAS("ip6t_osf");
  74MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_OSF);
  75