linux/net/netfilter/nf_conntrack_sane.c

// SPDX-License-Identifier: GPL-2.0-only
/* SANE connection tracking helper
 * (SANE = Scanner Access Now Easy)
 * For documentation about the SANE network protocol see
 * http://www.sane-project.org/html/doc015.html
 */

/* Copyright (C) 2007 Red Hat, Inc.
 * Author: Michal Schmidt <[email protected]>
 * Based on the FTP conntrack helper (net/netfilter/nf_conntrack_ftp.c):
 *  (C) 1999-2001 Paul `Rusty' Russell
 *  (C) 2002-2004 Netfilter Core Team <[email protected]>
 *  (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
 *  (C) 2003 Yasuyuki Kozakai @USAGI <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_sane.h>

#define HELPER_NAME …

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_ALIAS_NFCT_HELPER(…);

#define MAX_PORTS …
static u_int16_t ports[MAX_PORTS];
static unsigned int ports_c;
module_param_array(…);

struct sane_request { … };

struct sane_reply_net_start { … };

static int help(struct sk_buff *skb,
		unsigned int protoff,
		struct nf_conn *ct,
		enum ip_conntrack_info ctinfo)
{ … }

static struct nf_conntrack_helper sane[MAX_PORTS * 2] __read_mostly;

static const struct nf_conntrack_expect_policy sane_exp_policy = …;

static void __exit nf_conntrack_sane_fini(void)
{ … }

static int __init nf_conntrack_sane_init(void)
{ … }

module_init(…) …;
module_exit(nf_conntrack_sane_fini);