linux/net/netfilter/xt_TCPOPTSTRIP.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * A module for stripping a specific TCP option from TCP packets.
 *
 * Copyright (C) 2007 Sven Schnelle <[email protected]>
 * Copyright © CC Computer Consultants GmbH, 2007
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <net/ipv6.h>
#include <net/tcp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_TCPOPTSTRIP.h>

static inline unsigned int optlen(const u_int8_t *opt, unsigned int offset)
{ … }

static unsigned int
tcpoptstrip_mangle_packet(struct sk_buff *skb,
			  const struct xt_action_param *par,
			  unsigned int tcphoff)
{ … }

static unsigned int
tcpoptstrip_tg4(struct sk_buff *skb, const struct xt_action_param *par)
{ … }

#if IS_ENABLED(CONFIG_IP6_NF_MANGLE)
static unsigned int
tcpoptstrip_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{ … }
#endif

static struct xt_target tcpoptstrip_tg_reg[] __read_mostly = …;

static int __init tcpoptstrip_tg_init(void)
{ … }

static void __exit tcpoptstrip_tg_exit(void)
{ … }

module_init(…) …;
module_exit(tcpoptstrip_tg_exit);
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;