xt_osf.c (1748B)
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);