linux/net/netfilter/xt_tcpudp.c

// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) …
#include <linux/types.h>
#include <linux/module.h>
#include <net/ip.h>
#include <linux/ipv6.h>
#include <linux/icmp.h>
#include <net/ipv6.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_tcpudp.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;
MODULE_ALIAS(…) …;

/* Returns 1 if the port is matched by the range, 0 otherwise */
static inline bool
port_match(u_int16_t min, u_int16_t max, u_int16_t port, bool invert)
{ … }

static bool
tcp_find_option(u_int8_t option,
		const struct sk_buff *skb,
		unsigned int protoff,
		unsigned int optlen,
		bool invert,
		bool *hotdrop)
{ … }

static bool tcp_mt(const struct sk_buff *skb, struct xt_action_param *par)
{ … }

static int tcp_mt_check(const struct xt_mtchk_param *par)
{ … }

static bool udp_mt(const struct sk_buff *skb, struct xt_action_param *par)
{ … }

static int udp_mt_check(const struct xt_mtchk_param *par)
{ … }

/* Returns 1 if the type and code is matched by the range, 0 otherwise */
static bool type_code_in_range(u8 test_type, u8 min_code, u8 max_code,
			       u8 type, u8 code)
{ … }

static bool icmp_type_code_match(u8 test_type, u8 min_code, u8 max_code,
				 u8 type, u8 code, bool invert)
{ … }

static bool icmp6_type_code_match(u8 test_type, u8 min_code, u8 max_code,
				  u8 type, u8 code, bool invert)
{ … }

static bool
icmp_match(const struct sk_buff *skb, struct xt_action_param *par)
{ … }

static bool
icmp6_match(const struct sk_buff *skb, struct xt_action_param *par)
{ … }

static int icmp_checkentry(const struct xt_mtchk_param *par)
{ … }

static int icmp6_checkentry(const struct xt_mtchk_param *par)
{ … }

static struct xt_match tcpudp_mt_reg[] __read_mostly = …;

static int __init tcpudp_mt_init(void)
{ … }

static void __exit tcpudp_mt_exit(void)
{ … }

module_init(…) …;
module_exit(tcpudp_mt_exit);