icmp_var.h

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _NETINET_ICMP_VAR_H_
#define _NETINET_ICMP_VAR_H_

/*
 * Variables related to this implementation
 * of the internet control message protocol.
 */
struct	icmpstat {
/* statistics related to icmp packets generated */
	u_long	icps_error;		/* # of calls to icmp_error */
	u_long	icps_oldshort;		/* no error 'cuz old ip too short */
	u_long	icps_oldicmp;		/* no error 'cuz old was icmp */
	u_long	icps_outhist[ICMP_MAXTYPE + 1];
/* statistics related to input messages processed */
	u_long	icps_badcode;		/* icmp_code out of range */
	u_long	icps_tooshort;		/* packet < ICMP_MINLEN */
	u_long	icps_checksum;		/* bad checksum */
	u_long	icps_badlen;		/* calculated bound mismatch */
	u_long	icps_reflect;		/* number of responses */
	u_long	icps_inhist[ICMP_MAXTYPE + 1];
	u_long	icps_bmcastecho;	/* b/mcast echo requests dropped */
	u_long	icps_bmcasttstamp;	/* b/mcast tstamp requests dropped */
	u_long	icps_badaddr;		/* bad return address */
	u_long	icps_noroute;		/* no route back */
};

#ifdef _KERNEL
#include <sys/counter.h>
#include <netinet/in_kdtrace.h>

VNET_PCPUSTAT_DECLARE(struct icmpstat, icmpstat);
/*
 * In-kernel consumers can use these accessor macros directly to update
 * stats.
 */
#define ICMPSTAT_ADD(name, val)                                            \
	do {                                                               \
		MIB_SDT_PROBE1(icmp, count, name, (val));                  \
		VNET_PCPUSTAT_ADD(struct icmpstat, icmpstat, name, (val)); \
	} while (0)

#define	ICMPSTAT_INC(name)	ICMPSTAT_ADD(name, 1)
#define ICMPSTAT_INC2(name, type)                                            \
	do {                                                                 \
		MIB_SDT_PROBE2(icmp, count, name, 1, type);                  \
		VNET_PCPUSTAT_ADD(struct icmpstat, icmpstat, name[type], 1); \
	} while (0)

/*
 * Kernel module consumers must use this accessor macro.
 */
void	kmod_icmpstat_inc(int statnum);
#define KMOD_ICMPSTAT_INC(name)                                          \
	do {                                                             \
		MIB_SDT_PROBE1(icmp, count, name, 1);                    \
		kmod_icmpstat_inc(                                       \
		    offsetof(struct icmpstat, name) / sizeof(uint64_t)); \
	} while (0)
#endif

/*
 * Identifiers for ICMP sysctl nodes
 */
#define	ICMPCTL_MASKREPL	1	/* allow replies to netmask requests */
#define	ICMPCTL_STATS		2	/* statistics (read-only) */
#define ICMPCTL_ICMPLIM		3

#ifdef _KERNEL
SYSCTL_DECL(_net_inet_icmp);

extern int badport_bandlim(int);
#define BANDLIM_ICMP_UNREACH 0
#define BANDLIM_ICMP_ECHO 1
#define BANDLIM_ICMP_TSTAMP 2
#define BANDLIM_TCP_RST 3
#define BANDLIM_ICMP6_UNREACH 4
#define BANDLIM_SCTP_OOTB 5
#define BANDLIM_MAX 6
#endif

#endif