linux/net/netfilter/nf_conntrack_irc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* IRC extension for IP connection tracking, Version 1.21
 * (C) 2000-2002 by Harald Welte <[email protected]>
 * based on RR's ip_conntrack_ftp.c
 * (C) 2006-2012 Patrick McHardy <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/netfilter.h>
#include <linux/slab.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/nf_conntrack_irc.h>

#define MAX_PORTS …
static unsigned short ports[MAX_PORTS];
static unsigned int ports_c;
static unsigned int max_dcc_channels = …;
static unsigned int dcc_timeout __read_mostly = …;
/* This is slow, but it's simple. --RR */
static char *irc_buffer;
static DEFINE_SPINLOCK(irc_buffer_lock);

unsigned int (*nf_nat_irc_hook)(struct sk_buff *skb,
				enum ip_conntrack_info ctinfo,
				unsigned int protoff,
				unsigned int matchoff,
				unsigned int matchlen,
				struct nf_conntrack_expect *exp) __read_mostly;
EXPORT_SYMBOL_GPL(…);

#define HELPER_NAME …
#define MAX_SEARCH_SIZE …

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

module_param_array(…);
MODULE_PARM_DESC(…) …;
module_param(max_dcc_channels, uint, 0400);
MODULE_PARM_DESC(…) …;
module_param(dcc_timeout, uint, 0400);
MODULE_PARM_DESC(…) …;

static const char *const dccprotos[] = …;

#define MINMATCHLEN …

/* tries to get the ip_addr and port out of a dcc command
 * return value: -1 on failure, 0 on success
 *	data		pointer to first byte of DCC command data
 *	data_end	pointer to last byte of dcc command data
 *	ip		returns parsed ip of dcc command
 *	port		returns parsed port of dcc command
 *	ad_beg_p	returns pointer to first byte of addr data
 *	ad_end_p	returns pointer to last byte of addr data
 */
static int parse_dcc(char *data, const char *data_end, __be32 *ip,
		     u_int16_t *port, char **ad_beg_p, char **ad_end_p)
{ … }

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

static struct nf_conntrack_helper irc[MAX_PORTS] __read_mostly;
static struct nf_conntrack_expect_policy irc_exp_policy;

static int __init nf_conntrack_irc_init(void)
{ … }

static void __exit nf_conntrack_irc_fini(void)
{ … }

module_init(…) …;
module_exit(nf_conntrack_irc_fini);