8997ac8f09
Highlights of the change are:
- Use llentry instead of llinfo to manage ARP caches
- ARP specific data are stored in the hashed list
of an interface instead of the global list (llinfo_arp)
- Fine-grain locking on llentry
- arptimer (callout) per ARP cache
- the global timer callout with the big locks can be
removed (though softnet_lock is still required for now)
- net.inet.arp.prune is now obsoleted
- it was the interval of the global timer callout
- net.inet.arp.refresh is now obsoleted
- it was a parameter that prevents expiration of active caches
- Removed to simplify the timer logic, but we may be able to
restore the feature if really needed
Proposed on tech-kern and tech-net.
133 lines
5.8 KiB
C
133 lines
5.8 KiB
C
/* $NetBSD: if_arp.h,v 1.30 2015/08/31 08:05:20 ozaki-r Exp $ */
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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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*/
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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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uint16_t 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 /* IEEE 802 hardware format */
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#define ARPHRD_ARCNET 7 /* ethernet hardware format */
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#define ARPHRD_FRELAY 15 /* frame relay hardware format */
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#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
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#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
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uint16_t ar_pro; /* format of protocol address */
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uint8_t ar_hln; /* length of hardware address */
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uint8_t ar_pln; /* length of protocol address */
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uint16_t 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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uint8_t ar_sha[]; /* sender hardware address */
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uint8_t ar_spa[]; /* sender protocol address */
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uint8_t ar_tha[]; /* target hardware address */
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uint8_t ar_tpa[]; /* target protocol address */
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#endif
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#define ar_sha(ap) (((char *)((ap)+1))+0)
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#define ar_spa(ap) (((char *)((ap)+1))+(ap)->ar_hln)
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#define ar_tha(ap) \
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(ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
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? NULL : (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln))
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#define ar_tpa(ap) \
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(ntohs((ap)->ar_hrd) == ARPHRD_IEEE1394 \
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? (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln) \
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: (((char *)((ap)+1))+(ap)->ar_hln+(ap)->ar_pln+(ap)->ar_hln))
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} __packed;
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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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/*
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* Kernel statistics about arp
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*/
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#define ARP_STAT_SNDTOTAL 0 /* total packets sent */
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#define ARP_STAT_SNDREPLY 1 /* replies sent */
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#define ARP_STAT_SENDREQUEST 2 /* requests sent */
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#define ARP_STAT_RCVTOTAL 3 /* total packets received */
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#define ARP_STAT_RCVREQUEST 4 /* valid requests received */
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#define ARP_STAT_RCVREPLY 5 /* replies received */
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#define ARP_STAT_RCVMCAST 6 /* multicast/broadcast received */
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#define ARP_STAT_RCVBADPROTO 7 /* unknown protocol type received */
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#define ARP_STAT_RCVBADLEN 8 /* bad (short) length received */
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#define ARP_STAT_RCVZEROTPA 9 /* received w/ null target ip */
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#define ARP_STAT_RCVZEROSPA 10 /* received w/ null source ip */
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#define ARP_STAT_RCVNOINT 11 /* couldn't map to interface */
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#define ARP_STAT_RCVLOCALSHA 12 /* received from local hw address */
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#define ARP_STAT_RCVBCASTSHA 13 /* received w/ broadcast src */
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#define ARP_STAT_RCVLOCALSPA 14 /* received for a local ip [dup!] */
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#define ARP_STAT_RCVOVERPERM 15 /* attempts to overwrite static info */
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#define ARP_STAT_RCVOVERINT 16 /* attempts to overwrite wrong if */
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#define ARP_STAT_RCVOVER 17 /* entries overwritten! */
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#define ARP_STAT_RCVLENCHG 18 /* changes in hw address len */
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#define ARP_STAT_DFRTOTAL 19 /* deferred pending ARP resolution */
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#define ARP_STAT_DFRSENT 20 /* deferred, then sent */
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#define ARP_STAT_DFRDROPPED 21 /* deferred, then dropped */
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#define ARP_STAT_ALLOCFAIL 22 /* failures to allocate llinfo */
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#define ARP_NSTATS 23
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void arp_stat_add(int, uint64_t);
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#endif /* !_NET_IF_ARP_H_ */
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