// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2003+ Evgeniy Polyakov <zbr@ioremap.net>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/capability.h>
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#include <linux/if.h>
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#include <linux/inetdevice.h>
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#include <linux/ip.h>
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#include <linux/list.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/tcp.h>
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#include <net/ip.h>
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#include <net/tcp.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/x_tables.h>
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#include <net/netfilter/nf_log.h>
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#include <linux/netfilter/xt_osf.h>
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static bool
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xt_osf_match_packet(const struct sk_buff *skb, struct xt_action_param *p)
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{
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return nf_osf_match(skb, xt_family(p), xt_hooknum(p), xt_in(p),
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xt_out(p), p->matchinfo, xt_net(p), nf_osf_fingers);
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}
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static struct xt_match xt_osf_match = {
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.name = "osf",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.proto = IPPROTO_TCP,
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.hooks = (1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_FORWARD),
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.match = xt_osf_match_packet,
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.matchsize = sizeof(struct xt_osf_info),
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.me = THIS_MODULE,
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};
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static int __init xt_osf_init(void)
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{
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int err;
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err = xt_register_match(&xt_osf_match);
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if (err) {
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pr_err("Failed to register OS fingerprint "
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"matching module (%d)\n", err);
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return err;
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}
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return 0;
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}
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static void __exit xt_osf_fini(void)
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{
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xt_unregister_match(&xt_osf_match);
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}
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module_init(xt_osf_init);
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module_exit(xt_osf_fini);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
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MODULE_DESCRIPTION("Passive OS fingerprint matching.");
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MODULE_ALIAS("ipt_osf");
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MODULE_ALIAS("ip6t_osf");
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MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_OSF);
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