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b25d74e06c
r344504 added an extra ARP_LOG() call in case of an if_output() failure.
It turns out IPv4 can be noisy. In order to not spam the console by default:
(a) add a counter for these events so people can keep better track of how
often it happens, and
(b) add a sysctl to select the default ARP_LOG log level and set it to
INFO avoiding the one (the new) DEBUG level by default.
Claim a spare (1st one after 10 years since the stats were added) in order
to not break netstat from FreeBSD 12->13 updates in the future.
Reviewed by: karels
Differential Revision: https://reviews.freebsd.org/D19490
136 lines
5.4 KiB
C
136 lines
5.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_arp.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IF_ARP_H_
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#define _NET_IF_ARP_H_
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/*
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* Address Resolution Protocol.
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*
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* See RFC 826 for protocol description. ARP packets are variable
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* in size; the arphdr structure defines the fixed-length portion.
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* Protocol type values are the same as those for 10 Mb/s Ethernet.
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* It is followed by the variable-sized fields ar_sha, arp_spa,
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* arp_tha and arp_tpa in that order, according to the lengths
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* specified. Field names used correspond to RFC 826.
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*/
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struct arphdr {
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u_short ar_hrd; /* format of hardware address */
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#define ARPHRD_ETHER 1 /* ethernet hardware format */
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#define ARPHRD_IEEE802 6 /* token-ring hardware format */
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#define ARPHRD_FRELAY 15 /* frame relay hardware format */
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#define ARPHRD_IEEE1394 24 /* firewire hardware format */
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#define ARPHRD_INFINIBAND 32 /* infiniband hardware format */
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u_short ar_pro; /* format of protocol address */
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u_char ar_hln; /* length of hardware address */
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u_char ar_pln; /* length of protocol address */
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u_short ar_op; /* one of: */
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#define ARPOP_REQUEST 1 /* request to resolve address */
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#define ARPOP_REPLY 2 /* response to previous request */
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#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
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#define ARPOP_REVREPLY 4 /* response giving protocol address */
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#define ARPOP_INVREQUEST 8 /* request to identify peer */
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#define ARPOP_INVREPLY 9 /* response identifying peer */
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/*
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* The remaining fields are variable in size,
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* according to the sizes above.
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*/
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#ifdef COMMENT_ONLY
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u_char ar_sha[]; /* sender hardware address */
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u_char ar_spa[]; /* sender protocol address */
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u_char ar_tha[]; /* target hardware address */
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u_char ar_tpa[]; /* target protocol address */
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#endif
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};
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#define ar_sha(ap) (((caddr_t)((ap)+1)) + 0)
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#define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln)
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#define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln)
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#define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
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#define arphdr_len2(ar_hln, ar_pln) \
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(sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
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#define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
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/*
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* ARP ioctl request
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*/
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struct arpreq {
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struct sockaddr arp_pa; /* protocol address */
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struct sockaddr arp_ha; /* hardware address */
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int arp_flags; /* flags */
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};
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/* arp_flags and at_flags field values */
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#define ATF_INUSE 0x01 /* entry in use */
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#define ATF_COM 0x02 /* completed entry (enaddr valid) */
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#define ATF_PERM 0x04 /* permanent entry */
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#define ATF_PUBL 0x08 /* publish entry (respond for other host) */
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#define ATF_USETRAILERS 0x10 /* has requested trailers */
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struct arpstat {
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/* Normal things that happen: */
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uint64_t txrequests; /* # of ARP requests sent by this host. */
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uint64_t txreplies; /* # of ARP replies sent by this host. */
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uint64_t rxrequests; /* # of ARP requests received by this host. */
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uint64_t rxreplies; /* # of ARP replies received by this host. */
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uint64_t received; /* # of ARP packets received by this host. */
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uint64_t txerrors; /* # of ARP requests failed to send. */
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uint64_t arp_spares[3]; /* For either the upper or lower half. */
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/* Abnormal event and error counting: */
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uint64_t dropped; /* # of packets dropped waiting for a reply. */
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uint64_t timeouts; /* # of times with entries removed */
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/* due to timeout. */
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uint64_t dupips; /* # of duplicate IPs detected. */
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};
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#ifdef _KERNEL
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#include <sys/counter.h>
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#include <net/vnet.h>
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VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat);
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/*
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* In-kernel consumers can use these accessor macros directly to update
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* stats.
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*/
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#define ARPSTAT_ADD(name, val) \
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VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val))
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#define ARPSTAT_SUB(name, val) ARPSTAT_ADD(name, -(val))
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#define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1)
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#define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1)
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#endif /* _KERNEL */
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#endif /* !_NET_IF_ARP_H_ */
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