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